libstdc++-v3/doc/html/manual/status.html

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   3   Introduction
   4
   5 </th><td width="20%" align="right"> <a accesskey="n" href="license.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="manual.intro.status"></a>Chapter 1. Status</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="status.html#manual.intro.status.iso">Implementation Status</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#status.iso.1998">C++ 1998/2003</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.1998.status">Implementation Status</a></span></dt><dt><span class="section"><a href="status.html#iso.1998.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2011">C++ 2011</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2011.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2014">C++ 2014</a></span></dt><dt><span class="section"><a href="status.html#status.iso.2017">C++ 2017</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2017.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2020">C++ 2020</a></span></dt><dt><span class="section"><a href="status.html#status.iso.tr1">C++ TR1</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.tr1.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.tr24733">C++ TR 24733</a></span></dt><dt><span class="section"><a href="status.html#status.iso.specfun">C++ IS 29124</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.specfun.specific">Implementation Specific Behavior</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="license.html">License</a></span></dt><dd><dl><dt><span class="section"><a href="license.html#manual.intro.status.license.gpl">The Code: GPL</a></span></dt><dt><span class="section"><a href="license.html#manual.intro.status.license.fdl">The Documentation: GPL, FDL</a></span></dt></dl></dd><dt><span class="section"><a href="bugs.html">Bugs</a></span></dt><dd><dl><dt><span class="section"><a href="bugs.html#manual.intro.status.bugs.impl">Implementation Bugs</a></span></dt><dt><span class="section"><a href="bugs.html#manual.intro.status.bugs.iso">Standard Bugs</a></span></dt></dl></dd></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.status.iso"></a>Implementation Status</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.1998"></a>C++ 1998/2003</h3></div></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.1998.status"></a>Implementation Status</h4></div></div></div><p>
   6 This status table is based on the table of contents of ISO/IEC 14882:2003.
   7 </p><p>
   8 This section describes the C++ support in mainline GCC, not in any
   9 particular release.
  10 </p><div class="table"><a id="table.cxx98_status"></a><p class="title"><strong>Table 1.1. C++ 1998/2003 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 1998/2003 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
  11         <span class="emphasis"><em>18</em></span>
  12       </td><td colspan="3" align="left">
  13         <span class="emphasis"><em>Language support</em></span>
  14       </td></tr><tr><td align="left">18.1</td><td align="left">Types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2</td><td align="left">Implementation properties</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2.1</td><td align="left">Numeric Limits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.2.1.1</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2.1.2</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td class="auto-generated"> </td></tr><tr><td align="left">18.2.1.3</td><td align="left"><code class="code">float_round_style</code></td><td align="left">Y</td><td class="auto-generated"> </td></tr><tr><td align="left">18.2.1.4</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">Y</td><td class="auto-generated"> </td></tr><tr><td align="left">18.2.1.5</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.2.2</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3</td><td align="left">Start and termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.4</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.5</td><td align="left">Type identification</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.5.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.5.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.5.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.6.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6.2</td><td align="left">Violation exception-specifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.6.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  15         <span class="emphasis"><em>19</em></span>
  16       </td><td colspan="3" align="left">
  17         <span class="emphasis"><em>Diagnostics</em></span>
  18       </td></tr><tr><td align="left">19.1</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.2</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.3</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  19         <span class="emphasis"><em>20</em></span>
  20       </td><td colspan="3" align="left">
  21         <span class="emphasis"><em>General utilities</em></span>
  22       </td></tr><tr><td align="left">20.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.2</td><td align="left"><code class="code">pair</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.3.1</td><td align="left">Base</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.2</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.3</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.4</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.5</td><td align="left">Negators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.6</td><td align="left">Binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.7</td><td align="left">Adaptors for pointers to functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.8</td><td align="left">Adaptors for pointers to members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4</td><td align="left">Memory</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.1</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.3</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4.1</td><td align="left"><code class="code">uninitialized_copy</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4.2</td><td align="left"><code class="code">uninitialized_fill</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.4.3</td><td align="left"><code class="code">uninitialized_fill_n</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.5</td><td align="left">Class template <code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.6</td><td align="left">C library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  23         <span class="emphasis"><em>21</em></span>
  24       </td><td colspan="3" align="left">
  25         <span class="emphasis"><em>Strings</em></span>
  26       </td></tr><tr><td align="left">21.1</td><td align="left">Character traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.1.1</td><td align="left">Character traits requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.1.2</td><td align="left">traits typedef</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.1.3</td><td align="left"><code class="code">char_traits</code> specializations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.1.3.1</td><td align="left">struct <code class="code">char_traits&lt;char&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.1.3.2</td><td align="left">struct <code class="code">char_traits&lt;wchar_t&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Null-terminated sequence utilities</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">
  27         <span class="emphasis"><em>22</em></span>
  28       </td><td colspan="3" align="left">
  29         <span class="emphasis"><em>Localization</em></span>
  30       </td></tr><tr><td align="left">22.1</td><td align="left">Locales</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.1.1</td><td align="left">Class <code class="code">locale</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.1.2</td><td align="left"><code class="code">locale</code> globals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.1.3</td><td align="left">Convenience interfaces</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.1.3.1</td><td align="left">Character classification</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.1.3.2</td><td align="left">Character conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Standard locale categories</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.1</td><td align="left"><code class="code">ctype</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.2</td><td align="left">Numeric</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.2.1</td><td align="left"><code class="code">num_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.2.2</td><td align="left"><code class="code">num_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.3</td><td align="left"><code class="code">num_punct</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.4</td><td align="left"><code class="code">collate</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5</td><td align="left">Time</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.5.1</td><td align="left"><code class="code">time_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5.2</td><td align="left"><code class="code">time_get_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5.3</td><td align="left"><code class="code">time_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.5.3</td><td align="left"><code class="code">time_put_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6</td><td align="left">Monetary</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2.6.1</td><td align="left"><code class="code">money_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6.2</td><td align="left"><code class="code">money_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6.3</td><td align="left"><code class="code">money_punct</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.6.4</td><td align="left"><code class="code">money_punct_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.7</td><td align="left"><code class="code">messages</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2.8</td><td align="left">Program-defined facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  31         <span class="emphasis"><em>23</em></span>
  32       </td><td colspan="3" align="left">
  33         <span class="emphasis"><em>Containers</em></span>
  34       </td></tr><tr><td align="left">23.1</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Sequence containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.1</td><td align="left">Class template <code class="code">deque</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.2</td><td align="left">Class template <code class="code">list</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3</td><td align="left">Adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.3.1</td><td align="left">Class template <code class="code">queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3.2</td><td align="left">Class template <code class="code">priority_queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3.3</td><td align="left">Class template <code class="code">stack</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.4</td><td align="left">Class template <code class="code">vector</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.5</td><td align="left">Class <code class="code">vector&lt;bool&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3</td><td align="left">Associative containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.3.1</td><td align="left">Class template <code class="code">map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.2</td><td align="left">Class template <code class="code">multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.3</td><td align="left">Class template <code class="code">set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.4</td><td align="left">Class template <code class="code">multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  35         <span class="emphasis"><em>24</em></span>
  36       </td><td colspan="3" align="left">
  37         <span class="emphasis"><em>Iterators</em></span>
  38       </td></tr><tr><td align="left">24.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Header <code class="code">&lt;iterator&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">Predefined iterators and Iterator adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.4.1</td><td align="left">Reverse iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.2</td><td align="left">Insert iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5</td><td align="left">Stream iterators</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.5.1</td><td align="left">Class template <code class="code">istream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.2</td><td align="left">Class template <code class="code">ostream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.3</td><td align="left">Class template <code class="code">istreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.4</td><td align="left">Class template <code class="code">ostreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  39         <span class="emphasis"><em>25</em></span>
  40       </td><td colspan="3" align="left">
  41         <span class="emphasis"><em>Algorithms</em></span>
  42       </td></tr><tr><td align="left">25.1</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  43       <span class="emphasis"><em>26</em></span>
  44       </td><td colspan="3" align="left">
  45         <span class="emphasis"><em>Numerics</em></span>
  46       </td></tr><tr><td align="left">26.1</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">Numeric arrays</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.3.1</td><td align="left">Header <code class="code">&lt;valarray&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.2</td><td align="left">Class template <code class="code">valarray</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.3</td><td align="left"><code class="code">valarray</code> non-member operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.4</td><td align="left">Class <code class="code">slice</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.5</td><td align="left">Class template <code class="code">slice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.6</td><td align="left">Class <code class="code">gslice</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.7</td><td align="left">Class template <code class="code">gslice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.8</td><td align="left">Class template <code class="code">mask_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3.9</td><td align="left">Class template <code class="code">indirect_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Generalized numeric operations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.4.1</td><td align="left"><code class="code">accumulate</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.2</td><td align="left"><code class="code">inner_product</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.3</td><td align="left"><code class="code">partial_sum</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.4</td><td align="left"><code class="code">adjacent_difference</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.5</td><td align="left">iota</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  47         <span class="emphasis"><em>27</em></span>
  48       </td><td colspan="3" align="left">
  49         <span class="emphasis"><em>Input/output</em></span>
  50       </td></tr><tr><td align="left">27.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3.1</td><td align="left">Narrow stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3.2</td><td align="left">Wide stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
  51         <span class="emphasis"><em>Appendix D</em></span>
  52       </td><td colspan="3" align="left">
  53         <span class="emphasis"><em>Compatibility features</em></span>
  54       </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with bool operand</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">static</code> keyword</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.3</td><td align="left">Access declarations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.4</td><td align="left">Implicit conversion from const strings</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left">char* streams</td><td align="left"> </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.1998.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>
  55      The ISO standard defines the following phrase:
  56    </p><div class="blockquote"><blockquote class="blockquote"><div class="variablelist"><dl class="variablelist"><dt><span class="term">
  57          <code class="code">[1.3.5] implementation-defined behavior</code>
  58        </span></dt><dd><p>
  59          Behavior, for a well-formed program construct and correct data, that
  60          depends on the implementation <span class="emphasis"><em>and that each implementation
  61          shall document</em></span>.
  62          </p></dd></dl></div></blockquote></div><p>
  63      We do so here, for the C++ library only.  Behavior of the
  64      compiler, linker, runtime loader, and other elements of "the
  65      implementation" are documented elsewhere.  Everything listed
  66      in Annex B, Implementation Qualities, are also part of the
  67      compiler, not the library.
  68    </p><p>
  69      For each entry, we give the section number of the standard, when
  70      applicable.  This list is probably incomplet and inkorrekt.
  71    </p><p>
  72      <span class="emphasis"><em>[1.9]/11 #3</em></span> If <code class="code">isatty(3)</code> is true, then
  73       interactive stream support is implied.
  74    </p><p>
  75      <span class="emphasis"><em>[17.4.4.5]</em></span> Non-reentrant functions are probably best
  76       discussed in the various sections on multithreading (see above).
  77    </p><p><span class="emphasis"><em>[18.1]/4</em></span> The type of <code class="code">NULL</code> is described
  78       under <a class="link" href="support.html#std.support.types.null" title="NULL">Support</a>.
  79    </p><p><span class="emphasis"><em>[18.3]/8</em></span> Even though it's listed in the library
  80       sections, libstdc++ has zero control over what the cleanup code hands
  81       back to the runtime loader.  Talk to the compiler people.  :-)
  82    </p><p><span class="emphasis"><em>[18.4.2.1]/5</em></span> (bad_alloc),
  83       <span class="emphasis"><em>[18.5.2]/5</em></span> (bad_cast),
  84       <span class="emphasis"><em>[18.5.3]/5</em></span> (bad_typeid),
  85       <span class="emphasis"><em>[18.6.1]/8</em></span> (exception),
  86       <span class="emphasis"><em>[18.6.2.1]/5</em></span> (bad_exception):  The <code class="code">what()</code>
  87       member function of class <code class="code">std::exception</code>, and these other
  88       classes publicly derived from it, returns the name of the
  89       class, e.g. <code class="literal">"std::bad_alloc"</code>.
  90    </p><p><span class="emphasis"><em>[18.5.1]/7</em></span> The return value of
  91       <code class="code">std::type_info::name()</code> is the mangled type name.
  92       You will need to call <code class="code">c++filt</code> and pass the names as
  93       command-line parameters to demangle them, or call a
  94       <a class="link" href="ext_demangling.html" title="Chapter 28. Demangling">runtime demangler function</a>.
  95    </p><p><span class="emphasis"><em>[20.1.5]/5</em></span> <span class="emphasis"><em>"Implementors are encouraged to
  96       supply libraries that can accept allocators that encapsulate more
  97       general memory models and that support non-equal instances.  In such
  98       implementations, any requirements imposed on allocators by containers
  99       beyond those requirements that appear in Table 32, and the semantics
 100       of containers and algorithms when allocator instances compare
 101       non-equal, are implementation-defined."</em></span>  There is experimental
 102       support for non-equal allocators in the standard containers in C++98
 103       mode. There are no additional requirements on allocators. It is undefined
 104       behaviour to swap two containers if their allocators are not equal.
 105    </p><p><span class="emphasis"><em>[21.1.3.1]/3,4</em></span>,
 106       <span class="emphasis"><em>[21.1.3.2]/2</em></span>,
 107       <span class="emphasis"><em>[21.3]/6 basic_string::iterator, basic_string::const_iterator</em></span>,
 108       <span class="emphasis"><em>[23.*]'s foo::iterator</em></span>,
 109       <span class="emphasis"><em>[27.*]'s foo::*_type</em></span>,
 110       <span class="emphasis"><em>others...</em></span>
 111       Nope, these types are called implementation-defined because you
 112       shouldn't be taking advantage of their underlying types.  Listing them
 113       here would defeat the purpose.  :-)
 114    </p><p><span class="emphasis"><em>[21.1.3.1]/5</em></span> I don't really know about
 115       the <span class="type">mbstate_t</span> stuff... see
 116       the <a class="link" href="facets.html#std.localization.facet.codecvt" title="codecvt"><code class="code">codecvt</code>
 117       notes</a> for what does exist.
 118    </p><p><span class="emphasis"><em>[22.*]</em></span> Anything and everything we have on locale
 119       implementation will be described under
 120       <a class="link" href="localization.html#std.localization.locales.locale" title="locale">Localization</a>.
 121    </p><p><span class="emphasis"><em>[23.*]</em></span> All of the containers in this clause
 122      define <span class="type">size_type</span> as <span class="type">std::size_t</span> and
 123      <span class="type">difference_type</span> as <span class="type">std::ptrdiff_t</span>.
 124    </p><p><span class="emphasis"><em>[26.2.8]/9</em></span> I have no idea what
 125       <code class="code">complex&lt;T&gt;</code>'s <code class="code">pow(0,0)</code> returns.
 126    </p><p><span class="emphasis"><em>[27.4.2.4]/2</em></span> Calling
 127       <code class="code">std::ios_base::sync_with_stdio</code> after I/O has already been
 128       performed on the standard stream objects will
 129       flush the buffers, and
 130       destroy and recreate the underlying buffer instances.  Whether or not
 131       the previously-written I/O is destroyed in this process depends mostly
 132       on the <code class="code">--enable-libio</code> choice:  for stdio, if the written
 133       data is already in the stdio buffer, the data may be completely safe!
 134    </p><p><span class="emphasis"><em>[27.6.1.1.2]</em></span>,
 135       <span class="emphasis"><em>[27.6.2.3]</em></span> The I/O sentry ctor and dtor can perform
 136       additional work than the minimum required.  We are not currently taking
 137       advantage of this yet.
 138    </p><p><span class="emphasis"><em>[27.7.1.3]/16</em></span>,
 139       <span class="emphasis"><em>[27.8.1.4]/10</em></span>
 140       The effects of <code class="code">pubsetbuf/setbuf</code> are described in the
 141       <a class="link" href="io.html" title="Chapter 13.  Input and Output">Input and Output</a> chapter.
 142    </p><p><span class="emphasis"><em>[27.8.1.4]/16</em></span> Calling <code class="code">fstream::sync</code> when
 143       a get area exists will... whatever <code class="code">fflush()</code> does, I think.
 144    </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2011"></a>C++ 2011</h3></div></div></div><p>
 145 <a id="status.iso.200x"></a>
 146 This table is based on the table of contents of ISO/IEC
 147 JTC1 SC22 WG21 Doc No: N3290 Date: 2011-04-11
 148 Final Draft International Standard, Standard for Programming Language C++
 149 </p><p>
 150 In this implementation the <code class="literal">-std=gnu++11</code> or
 151 <code class="literal">-std=c++11</code> flag must be used to enable language
 152 and library
 153 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a>
 154 options. The pre-defined symbol
 155 <code class="constant">__cplusplus</code> is used to check for the
 156 presence of the required flag.
 157 </p><p>
 158 This status table is based on the table of contents of ISO/IEC 14882:2011.
 159 </p><p>
 160 This section describes the C++11 support in mainline GCC, not in any
 161 particular release.
 162 </p><div class="table"><a id="table.cxx11_status"></a><p class="title"><strong>Table 1.2. C++ 2011 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2011 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
 163         <span class="emphasis"><em>18</em></span>
 164       </td><td colspan="3" align="left">
 165         <span class="emphasis"><em>Language support</em></span>
 166       </td></tr><tr><td align="left">18.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.2</td><td align="left">Types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3</td><td align="left">Implementation properties</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2</td><td align="left">Numeric Limits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2.3</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.2.4</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.5</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.6</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">18.3.2.7</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.3</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.4</td><td align="left">Integer types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.4.1</td><td align="left">Header <code class="code">&lt;cstdint&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">18.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">18.6</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7</td><td align="left">Type identification</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.7.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.8.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.2</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.5</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.6</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9</td><td align="left">Initializer lists</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.9.1</td><td align="left">Initializer list constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.2</td><td align="left">Initializer list access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.3</td><td align="left">Initializer list range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 167         <span class="emphasis"><em>19</em></span>
 168       </td><td colspan="3" align="left">
 169         <span class="emphasis"><em>Diagnostics</em></span>
 170       </td></tr><tr><td align="left">19.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5</td><td align="left">System error support</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.5.1</td><td align="left">Class <code class="code">error_category</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.2</td><td align="left">Class <code class="code">error_code</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.3</td><td align="left">Class <code class="code">error_condition</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.4</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.5</td><td align="left">Class <code class="code">system_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 171         <span class="emphasis"><em>20</em></span>
 172       </td><td colspan="3" align="left">
 173         <span class="emphasis"><em>General utilities</em></span>
 174       </td></tr><tr><td align="left">20.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.2</td><td align="left">swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.3</td><td align="left">forward/move helpers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.4</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3</td><td align="left">Pairs</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.3.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.3.2</td><td align="left">Class template <code class="code">pair</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.3</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.4</td><td align="left">Tuple-like access to <code class="code">pair</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3.5</td><td align="left">Piecewise construction</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4</td><td align="left">Tuples</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.2</td><td align="left">Class template <code class="code">tuple</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.4.2.1</td><td align="left">Construction</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.2</td><td align="left">Assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.3</td><td align="left">Swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.4</td><td align="left">Tuple creation functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.5</td><td align="left">Tuple helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.6</td><td align="left">Element access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.7</td><td align="left">Relational operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.8</td><td align="left">Tuple traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4.2.9</td><td align="left">Tuple specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5</td><td align="left">Class template <code class="code">bitset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.1</td><td align="left"><code class="code">bitset</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.2</td><td align="left"><code class="code">bitset</code> members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.3</td><td align="left"><code class="code">bitset</code> hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.4</td><td align="left"><code class="code">bitset</code> operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6</td><td align="left">Memory</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.2</td><td align="left">Header <code class="code">&lt;memory&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.3</td><td align="left">Pointer traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.4</td><td align="left">Pointer safety</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.5</td><td align="left">Align</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.6</td><td align="left">Allocator argument tag</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.7</td><td align="left"><code class="code">uses_allocator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.8</td><td align="left">Allocator traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.10</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.11</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12</td><td align="left">Specialized algorithms</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.6.12.1</td><td align="left"><code class="code">addressof</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12.2</td><td align="left"><code class="code">uninitialized_copy</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12.3</td><td align="left"><code class="code">uninitialized_fill</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.12.4</td><td align="left"><code class="code">uninitialized_fill_n</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6.13</td><td align="left">C library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.7.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2</td><td align="left">Shared-ownership pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.7.2.1</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.2</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left">Y</td><td align="left">
 175           Uses code from
 176           <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>.
 177       </td></tr><tr><td align="left">20.7.2.3</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.4</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.5</td><td align="left"><code class="code">shared_ptr</code> atomic access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7.2.6</td><td align="left">Smart pointer hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.1</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.2</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.3</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.4</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.5</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.6</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.7</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.8</td><td align="left">Negators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.9</td><td align="left">Function template <code class="code">bind</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.10</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.11</td><td align="left">Polymorphic function wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.11.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">20.8.11.2</td><td align="left">Class template <code class="code">function</code></td><td align="left">Partial</td><td align="left">Missing allocator support</td></tr><tr><td align="left">20.8.12</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9</td><td align="left">Metaprogramming and type traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.2</td><td align="left">Header <code class="code">&lt;type_traits&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4.1</td><td align="left">Primary type categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4.2</td><td align="left">Composite type traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4.3</td><td align="left">Type properties</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7</td><td align="left">Transformations between types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.7.1</td><td align="left">Const-volatile modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.2</td><td align="left">Reference modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.3</td><td align="left">Sign modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.4</td><td align="left">Array modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.5</td><td align="left">Pointer modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7.6</td><td align="left">Other transformations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10</td><td align="left">Compile-time rational arithmetic</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.2</td><td align="left">Header <code class="code">&lt;ratio&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.3</td><td align="left">Class template <code class="code">ratio</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.4</td><td align="left">Arithmetic on <code class="code">ratio</code>s</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.5</td><td align="left">Comparison of <code class="code">ratio</code>s</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.6</td><td align="left">SI types for <code class="code">ratio</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11</td><td align="left">Time utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.11.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.4</td><td align="left">Time-related traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.11.4.1</td><td align="left"><code class="code">treat_as_floating_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.4.2</td><td align="left"><code class="code">duration_values</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.4.3</td><td align="left">Specializations of <code class="code">common_type</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.7</td><td align="left">Clocks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.11.7.1</td><td align="left">Class <code class="code">system_clock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.7.2</td><td align="left">Class <code class="code">steady_clock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.7.3</td><td align="left">Class <code class="code">high_resolution_clock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11.8</td><td align="left">Date and time functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12</td><td align="left">Scoped allocator adaptor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.1</td><td align="left">Header <code class="code">&lt;scoped_allocator&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.12.2</td><td align="left">Scoped allocator adaptor member types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.3</td><td align="left">Scoped allocator adaptor constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.4</td><td align="left">Scoped allocator adaptor members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.5</td><td align="left">Scoped allocator operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.13</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 178         <span class="emphasis"><em>21</em></span>
 179       </td><td colspan="3" align="left">
 180         <span class="emphasis"><em>Strings</em></span>
 181       </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">Character traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.2.1</td><td align="left">Character traits requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.2</td><td align="left">traits typedefs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3</td><td align="left"><code class="code">char_traits</code> specializations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.2.3.1</td><td align="left">struct <code class="code">char_traits&lt;char&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3.2</td><td align="left">struct <code class="code">char_traits&lt;char16_t&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3.3</td><td align="left">struct <code class="code">char_traits&lt;char32_t&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2.3.4</td><td align="left">struct <code class="code">char_traits&lt;wchar_t&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.5</td><td align="left">Numeric Conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">21.7</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left">
 182         <span class="emphasis"><em>22</em></span>
 183       </td><td colspan="3" align="left">
 184         <span class="emphasis"><em>Localization</em></span>
 185       </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Header <code class="code">&lt;locale&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">Locales</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.3.1</td><td align="left">Class <code class="code">locale</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.2</td><td align="left"><code class="code">locale</code> globals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3</td><td align="left">Convenience interfaces</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.3.3.1</td><td align="left">Character classification</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3.2</td><td align="left">Conversions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.3.3.2.1</td><td align="left">Character conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3.2.2</td><td align="left"><code class="code">string</code> conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3.3.2.3</td><td align="left">Buffer conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.1</td><td align="left">The <code class="code">ctype</code> category</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.2</td><td align="left">The numeric category</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.2.1</td><td align="left"><code class="code">num_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.2.2</td><td align="left"><code class="code">num_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.3</td><td align="left">The numeric punctuation facet</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.4</td><td align="left">The collate category</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5</td><td align="left">The time category</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.5.1</td><td align="left">Class template <code class="code">time_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5.2</td><td align="left">Class template <code class="code">time_get_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5.3</td><td align="left">Class template <code class="code">time_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.5.3</td><td align="left">Class template <code class="code">time_put_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6</td><td align="left">The monetary category</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.4.6.1</td><td align="left">Class template <code class="code">money_get</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6.2</td><td align="left">Class template <code class="code">money_put</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6.3</td><td align="left">Class template <code class="code">money_punct</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.6.4</td><td align="left">Class template <code class="code">money_punct_byname</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.7</td><td align="left">The message retrieval category</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4.8</td><td align="left">Program-defined facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.5</td><td align="left">Standard code conversion facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.6</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 186         <span class="emphasis"><em>23</em></span>
 187       </td><td colspan="3" align="left">
 188         <span class="emphasis"><em>Containers</em></span>
 189       </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Container requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.1</td><td align="left">General container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.2</td><td align="left">Container data races</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3</td><td align="left">Sequence containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.3.2</td><td align="left">Class template <code class="code">array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.3</td><td align="left">Class template <code class="code">deque</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.4</td><td align="left">Class template <code class="code">forward_list</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.5</td><td align="left">Class template <code class="code">list</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.6</td><td align="left">Class template <code class="code">vector</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3.7</td><td align="left">Class <code class="code">vector&lt;bool&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4</td><td align="left">Associative containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.4.4</td><td align="left">Class template <code class="code">map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4.5</td><td align="left">Class template <code class="code">multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4.6</td><td align="left">Class template <code class="code">set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4.7</td><td align="left">Class template <code class="code">multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5</td><td align="left">Unordered associative containers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.5.4</td><td align="left">Class template <code class="code">unordered_map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5.5</td><td align="left">Class template <code class="code">unordered_multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5.6</td><td align="left">Class template <code class="code">unordered_set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5.7</td><td align="left">Class template <code class="code">unordered_multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6</td><td align="left">Container adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.6.1</td><td align="left">Class template <code class="code">queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6.2</td><td align="left">Class template <code class="code">priority_queue</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6.3</td><td align="left">Class template <code class="code">stack</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 190         <span class="emphasis"><em>24</em></span>
 191       </td><td colspan="3" align="left">
 192         <span class="emphasis"><em>Iterators</em></span>
 193       </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">Header <code class="code">&lt;iterator&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5</td><td align="left">Iterator adaptors</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.5.1</td><td align="left">Reverse iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.2</td><td align="left">Insert iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5.3</td><td align="left">Move iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6</td><td align="left">Stream iterators</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.6.1</td><td align="left">Class template <code class="code">istream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.2</td><td align="left">Class template <code class="code">ostream_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.3</td><td align="left">Class template <code class="code">istreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.4</td><td align="left">Class template <code class="code">ostreambuf_iterator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6.5</td><td align="left">range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 194         <span class="emphasis"><em>25</em></span>
 195       </td><td colspan="3" align="left">
 196         <span class="emphasis"><em>Algorithms</em></span>
 197       </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.5</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 198       <span class="emphasis"><em>26</em></span>
 199       </td><td colspan="3" align="left">
 200         <span class="emphasis"><em>Numerics</em></span>
 201       </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">Random number generation</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.1</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.2</td><td align="left">Header <code class="code">&lt;random&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.3</td><td align="left">Random number engine class templates</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.3.1</td><td align="left">Class template <code class="code">linear_congruential_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.3.2</td><td align="left">Class template <code class="code">mersenne_twister_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.3.3</td><td align="left">Class template <code class="code">subtract_with_carry_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.4</td><td align="left">Random number engine adaptor class templates</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.4.2</td><td align="left">Class template <code class="code">discard_block_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.4.3</td><td align="left">Class template <code class="code">independent_bits_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.4.4</td><td align="left">Class template <code class="code">shuffle_order_engine</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.5</td><td align="left">Engines and engine adaptors with predefined parameters</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.6</td><td align="left">Class <code class="code">random_device</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.7</td><td align="left">Utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.7.1</td><td align="left">Class <code class="code">seed_seq</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.7.2</td><td align="left">Function template <code class="code">generate_canonical</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8</td><td align="left">Random number distribution class templates</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.2</td><td align="left">Uniform distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.2.1</td><td align="left">Class template <code class="code">uniform_int_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.2.2</td><td align="left">Class template <code class="code">uniform_real_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3</td><td align="left">Bernoulli distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.1</td><td align="left">Class <code class="code">bernoulli_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.2</td><td align="left">Class template <code class="code">binomial_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.3</td><td align="left">Class template <code class="code">geometric_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.3.4</td><td align="left">Class template <code class="code">negative_binomial_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4</td><td align="left">Poisson distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.1</td><td align="left">Class template <code class="code">poisson_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.2</td><td align="left">Class template <code class="code">exponential_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.3</td><td align="left">Class template <code class="code">gamma_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.4</td><td align="left">Class template <code class="code">weibull_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.4.5</td><td align="left">Class template <code class="code">extreme_value_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5</td><td align="left">Normal distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.1</td><td align="left">Class template <code class="code">normal_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.2</td><td align="left">Class template <code class="code">lognormal_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.3</td><td align="left">Class template <code class="code">chi_squared_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.4</td><td align="left">Class template <code class="code">cauchy_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.5</td><td align="left">Class template <code class="code">fisher_f_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.5.6</td><td align="left">Class template <code class="code">student_t_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.6</td><td align="left">Sampling distributions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.5.8.6.1</td><td align="left">Class template <code class="code">discrete_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.6.2</td><td align="left">Class template <code class="code">piecewise_constant_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5.8.6.3</td><td align="left">Class template <code class="code">piecewise_linear_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6</td><td align="left">Numeric arrays</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.6.1</td><td align="left">Header <code class="code">&lt;valarray&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.2</td><td align="left">Class template <code class="code">valarray</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.3</td><td align="left"><code class="code">valarray</code> non-member operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.4</td><td align="left">Class <code class="code">slice</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.5</td><td align="left">Class template <code class="code">slice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.6</td><td align="left">The <code class="code">gslice</code> class</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.7</td><td align="left">Class template <code class="code">gslice_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.8</td><td align="left">Class template <code class="code">mask_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.9</td><td align="left">Class template <code class="code">indirect_array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6.10</td><td align="left"><code class="code">valarray</code> range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7</td><td align="left">Generalized numeric operations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.7.1</td><td align="left">Header <code class="code">&lt;numeric&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.2</td><td align="left">Accumulate&gt;</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.3</td><td align="left">Inner product</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.4</td><td align="left">Partial sum</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.5</td><td align="left">Adjacent difference</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7.6</td><td align="left">Iota</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.8</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 202         <span class="emphasis"><em>27</em></span>
 203       </td><td colspan="3" align="left">
 204         <span class="emphasis"><em>Input/output library</em></span>
 205       </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">27.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4.1</td><td align="left">Overview</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4.2</td><td align="left">Narrow stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4.3</td><td align="left">Wide stream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 206         <span class="emphasis"><em>28</em></span>
 207       </td><td colspan="3" align="left">
 208         <span class="emphasis"><em>Regular expressions</em></span>
 209       </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.4</td><td align="left">Header <code class="code">&lt;regex&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">28.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td><td align="left"> </td></tr><tr><td align="left">28.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 210         <span class="emphasis"><em>29</em></span>
 211       </td><td colspan="3" align="left">
 212         <span class="emphasis"><em>Atomic operations</em></span>
 213       </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.2</td><td align="left">Header <code class="code">&lt;atomic&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.3</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.4</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.5</td><td align="left">Atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.6</td><td align="left">Operations on atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.7</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8</td><td align="left">Fences</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 214         <span class="emphasis"><em>30</em></span>
 215       </td><td colspan="3" align="left">
 216         <span class="emphasis"><em>Thread support</em></span>
 217       </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.3</td><td align="left">Threads</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.3.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">30.3.2</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4</td><td align="left">Mutual exclusion</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1</td><td align="left">Mutex requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2</td><td align="left">Mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3</td><td align="left">Timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2</td><td align="left">Locks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.2.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2.2</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.3</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.4</td><td align="left">Call once</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.4.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.4.4.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR
 218         66146</a>
 219       </td></tr><tr><td align="left">30.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6</td><td align="left">Futures</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.1</td><td align="left">Overview</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.2</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.3</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.4</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.5</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.6</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.7</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.8</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.9</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 220         <span class="emphasis"><em>Appendix D</em></span>
 221       </td><td colspan="3" align="left">
 222         <span class="emphasis"><em>Compatibility features</em></span>
 223       </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with <code class="code">bool</code> operand</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">register</code> keyword</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.3</td><td align="left">Implicit declaration of copy functions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.4</td><td align="left">Dynamic exception specifications</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.8</td><td align="left">Function objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.9</td><td align="left">Binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.10</td><td align="left"><code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.11</td><td align="left">Violating exception-specifications</td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2011.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is also specified by the 1998 and 2003 standards,
 224       see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation
 225       Specific Behavior</a>. This section only documents behaviour which
 226       is new in the 2011 standard.
 227    </p><p>
 228       <span class="emphasis"><em>17.6.5.12 [res.on.exception.handling]</em></span>
 229       There are no implementation-defined exception classes, only standard
 230       exception classes (or classes derived from them) will be thrown.
 231    </p><p>
 232       <span class="emphasis"><em>17.6.5.14 [value.error.codes]</em></span>
 233       The <code class="classname">error_category</code> for errors originating outside
 234       the OS, and the possible error code values for each error category,
 235       should be documented here.
 236    </p><p>
 237       <span class="emphasis"><em>18.6.2.2 [new.badlength]</em></span>
 238       <code class="function">what()</code> returns
 239       <code class="literal">"std::bad_array_new_length"</code>.
 240    </p><p>
 241       <span class="emphasis"><em>20.6.9.1 [allocator.member]/5</em></span>
 242       Over-aligned types are not supported by
 243       <code class="classname">std::allocator</code>.
 244    </p><p>
 245       <span class="emphasis"><em>20.7.2.2.1 [util.smartptr.shared.const]</em></span>
 246       When a <code class="classname">shared_ptr</code> constructor fails
 247       <code class="classname">bad_alloc</code> (or types derived from it) will
 248       be thrown, or when an allocator is passed to the constructor then any
 249       exceptions thrown by the allocator.
 250    </p><p>
 251       <span class="emphasis"><em>20.7.2.0 [util.smartptr.weakptr]</em></span>
 252       <code class="code">what()</code> returns <code class="literal">"bad_weak_ptr"</code>.
 253    </p><p>
 254       <span class="emphasis"><em>20.8.9.1.3 [func.bind.place]/1</em></span> There are 29
 255       placeholders defined and the placeholder types are
 256       <code class="literal">CopyAssignable</code>.
 257    </p><p>
 258       <span class="emphasis"><em>20.11.7.1 [time.clock.system]/3, /4</em></span>
 259       Time point values are truncated to <code class="code">time_t</code> values.
 260       There is no loss of precision for conversions in the other direction.
 261    </p><p>
 262       <span class="emphasis"><em>20.15.7 [meta.trans]/2</em></span>
 263       <code class="classname">aligned_storage</code> does not support extended
 264       alignment.
 265    </p><p>
 266       <span class="emphasis"><em>21.2.3.2 [char.traits.specializations.char16_t]</em></span>,
 267       <span class="emphasis"><em>21.2.3.3 [char.traits.specializations.char32_t]</em></span>
 268       The types <code class="classname">u16streampos</code> and
 269       <code class="classname">u32streampos</code> are both synonyms for
 270       <code class="classname">fpos&lt;mbstate_t&gt;</code>.
 271       The function <code class="function">eof</code> returns <code class="code">int_type(-1)</code>.
 272       <code class="function">char_traits&lt;char16_t&gt;::to_int_type</code> will
 273       transform the "noncharacter" U+FFFF to U+FFFD (REPLACEMENT CHARACTER).
 274       This is done to ensure that <code class="function">to_int_type</code> never
 275       returns the same value as <code class="function">eof</code>, which is U+FFFF.
 276    </p><p>
 277       <span class="emphasis"><em>22.3.1 [locale]</em></span>
 278       There is one global locale for the whole program, not per-thread.
 279    </p><p>
 280       <span class="emphasis"><em>22.4.5.1.2 [locale.time.get.virtuals]</em></span>,
 281       <span class="emphasis"><em>22.4.5.3.2 [locale.time.put.virtuals]</em></span>
 282       Additional supported formats should be documented here.
 283    </p><p>
 284       <span class="emphasis"><em> 22.4.7.1.2 [locale.messages.virtuals]</em></span>
 285       The mapping should be documented here.
 286    </p><p>
 287       <span class="emphasis"><em>23.3.2.1 [array.overview]</em></span>
 288       <code class="classname">array&lt;T, N&gt;::iterator</code> is <code class="code">T*</code> and
 289       <code class="classname">array&lt;T, N&gt;::const_iterator</code> is
 290       <code class="code">const T*</code>.
 291    </p><p>
 292       <span class="emphasis"><em>23.5.4.2 [unord.map.cnstr]</em></span>,
 293       <span class="emphasis"><em>23.5.5.2 [unord.multimap.cnstr]</em></span>,
 294       <span class="emphasis"><em>23.5.6.2 [unord.set.cnstr]</em></span>,
 295       <span class="emphasis"><em>23.5.7.2 [unord.multiset.cnstr]</em></span>
 296       The default minimal bucket count is 0 for the default constructors, range
 297       constructors and initializer-list constructors.
 298    </p><p>
 299       <span class="emphasis"><em>25.3.12 [alg.random.shuffle]</em></span>
 300       The two-argument overload of <code class="function">random_shuffle</code>
 301       uses <code class="function">rand</code> as the source of randomness.
 302    </p><p>
 303       <span class="emphasis"><em>26.5.5 [rand.predef]</em></span>
 304       The type <code class="classname">default_random_engine</code> is a synonym for
 305       <code class="classname">minstd_rand0</code>.
 306    </p><p>
 307       <span class="emphasis"><em> 26.5.6 [rand.device] </em></span>
 308       The <code class="code">token</code> parameter of the
 309       <code class="classname">random_device</code> constructor can be used to select
 310       a specific source of random bytes. The valid token values are shown
 311       in the list below.
 312       The default constructor uses the token <code class="literal">"default"</code>.
 313       </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">"default"</code></span></dt><dd>
 314           Select the first available source from the other entries below.
 315           This is the only token that is always valid.
 316         </dd><dt><span class="term"><code class="literal">"rand_s"</code></span></dt><dd>
 317           Use the MSVCRT <code class="function">rand_s</code> function.
 318           This token is only valid for mingw-w64 targets.
 319         </dd><dt><span class="term"><code class="literal">"rdseed"</code>, </span><span class="term"><code class="literal">"rdrand"</code> or <code class="literal">"rdrnd"</code></span></dt><dd>
 320           Use the IA-32 <code class="literal">RDSEED</code> or <code class="literal">RDRAND</code>
 321           instruction to read from an on-chip hardware random number generator.
 322           These tokens are only valid for x86 and x86_64 targets when both
 323           the assembler and CPU support the corresponding instruction.
 324         </dd><dt><span class="term"><code class="literal">"/dev/urandom"</code>, </span><span class="term"><code class="literal">"/dev/random"</code></span></dt><dd>
 325           Use the named character special file to read random bytes from.
 326           These tokens are only valid when the device files are present
 327           and readable by the current user.
 328         </dd><dt><span class="term"><code class="literal">"mt19937"</code>, </span><span class="term">seed value</span></dt><dd>
 329           When no source of nondeterministic random numbers is available a
 330           <code class="classname">mersenne_twister_engine</code> will be used.
 331           An integer seed value can be used as the token and will be converted
 332           to an <code class="code">unsigned long</code> using <code class="function">strtoul</code>.
 333           These tokens are only valid when no other source of random bytes
 334           is available.
 335         </dd></dl></div><p>
 336       An exception of type <code class="classname">runtime_error</code> will be
 337       thrown if a <code class="classname">random_device</code> object is constructed
 338       with an invalid token, or if it cannot open or read from the source
 339       of random bytes.
 340    </p><p>
 341       <span class="emphasis"><em>26.5.8.1 [rand.dist.general]</em></span>
 342       The algorithms used by the distributions should be documented here.
 343    </p><p>
 344       <span class="emphasis"><em>26.8 [c.math]</em></span> Whether the
 345       <code class="function">rand</code> function introduces data races depends on
 346       the C library as the function is not provided by libstdc++.
 347    </p><p>
 348       <span class="emphasis"><em>27.8.2.1 [stringbuf.cons]</em></span>
 349       Whether the sequence pointers are copied by the
 350       <code class="classname">basic_stringbuf</code> move constructor should be
 351       documented here.
 352    </p><p>
 353       <span class="emphasis"><em>27.9.1.2 [filebuf.cons]</em></span>
 354       Whether the sequence pointers are copied by the
 355       <code class="classname">basic_filebuf</code> move constructor should be
 356       documented here.
 357    </p><p>
 358       <span class="emphasis"><em>28.5.1 [re.synopt]</em></span>,
 359       <span class="emphasis"><em> 28.5.2 [re.matchflag] </em></span>,
 360       <span class="emphasis"><em> 28.5.3 [re.err] </em></span>
 361       <code class="code">syntax_option_type</code>, <code class="code">match_flag_type</code>
 362       and <code class="code">error_type</code> are unscoped enumeration types.
 363    </p><p>
 364       <span class="emphasis"><em>28.7 [re.traits]</em></span>
 365       The <code class="literal">blank</code> character class corresponds to the
 366       <code class="code">ctype_base::blank</code> mask.
 367    </p><p>
 368       <span class="emphasis"><em>29.4 [atomics.lockfree]</em></span>
 369       The values of the <code class="code">ATOMIC_xxx_LOCK_FREE</code> macros depend on
 370       the target and cannot be listed here.
 371    </p><p>
 372       <span class="emphasis"><em>30.2.3 [thread.req.native]/1</em></span>
 373       <code class="classname">native_handle_type</code> and
 374       <code class="methodname">native_handle</code> are provided. The handle types
 375       are defined in terms of the Gthreads abstraction layer, although this
 376       is subject to change at any time. Any use of
 377       <code class="classname">native_handle</code> is inherently non-portable and
 378       not guaranteed to work between major releases of GCC.
 379       </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="classname">thread</code></span></dt><dd>
 380             The native handle type is a typedef for <code class="code">__gthread_t</code>
 381             i.e. <code class="code">pthread_t</code> when GCC is configured with the
 382             <code class="literal">posix</code> thread model.
 383             The value of the native handle is undefined for a thread
 384             which is not joinable.
 385          </dd><dt><span class="term"><code class="classname">mutex</code>, </span><span class="term"><code class="classname">timed_mutex</code></span></dt><dd>
 386             The native handle type is <code class="code">__gthread_mutex_t*</code> i.e.
 387             <code class="code">pthread_mutex_t*</code> for the <code class="literal">posix</code>
 388             thread model.
 389          </dd><dt><span class="term"><code class="classname">recursive_mutex</code>, </span><span class="term"><code class="classname">recursive_timed_mutex</code></span></dt><dd>
 390             The native handle type is <code class="code">__gthread_recursive_mutex_t*</code>
 391             i.e. <code class="code">pthread_mutex_t*</code> for the <code class="literal">posix</code>
 392             thread model.
 393          </dd><dt><span class="term"><code class="classname">condition_variable</code></span></dt><dd>
 394             The native handle type is <code class="code">__gthread_cond_t*</code> i.e.
 395             <code class="code">pthread_cond_t*</code> for the <code class="literal">posix</code>
 396             thread model.
 397          </dd></dl></div><p>
 398    </p><p>
 399       <span class="emphasis"><em>30.6.1 [futures.overview]/2</em></span>
 400       <code class="code">launch</code> is a scoped enumeration type with
 401       overloaded operators to support bitmask operations. There are no
 402       additional bitmask elements defined.
 403    </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2014"></a>C++ 2014</h3></div></div></div><p>
 404 In this implementation the <code class="literal">-std=gnu++14</code> or
 405 <code class="literal">-std=c++14</code> flag must be used to enable language
 406 and library
 407 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a>
 408 options. The pre-defined symbol
 409 <code class="constant">__cplusplus</code> is used to check for the
 410 presence of the required flag.
 411 </p><p>
 412 This status table is based on the table of contents of ISO/IEC 14882:2014.
 413 Some subclauses are not shown in the table where the content is unchanged
 414 since C++11 and the implementation is complete.
 415 </p><p>
 416 This section describes the C++14 and library TS support in mainline GCC,
 417 not in any particular release.
 418 </p><div class="table"><a id="table.cxx14_status"></a><p class="title"><strong>Table 1.3. C++ 2014 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2014 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
 419         <span class="emphasis"><em>18</em></span>
 420       </td><td colspan="3" align="left">
 421         <span class="emphasis"><em>Language support</em></span>
 422       </td></tr><tr><td align="left">18.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.2</td><td align="left">Types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3</td><td align="left">Implementation properties</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2</td><td align="left">Numeric Limits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.3.2.3</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.2.4</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.5</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.6</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">18.3.2.7</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.3.3</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.4</td><td align="left">Integer types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.4.1</td><td align="left">Header <code class="code">&lt;cstdint&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">18.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">18.6</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7</td><td align="left">Type identification</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.7.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.7.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.8.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.2</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.5</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.8.6</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9</td><td align="left">Initializer lists</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">18.9.1</td><td align="left">Initializer list constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.2</td><td align="left">Initializer list access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.9.3</td><td align="left">Initializer list range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">18.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 423         <span class="emphasis"><em>19</em></span>
 424       </td><td colspan="3" align="left">
 425         <span class="emphasis"><em>Diagnostics</em></span>
 426       </td></tr><tr><td align="left">19.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5</td><td align="left">System error support</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">19.5.1</td><td align="left">Class <code class="code">error_category</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.2</td><td align="left">Class <code class="code">error_code</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.3</td><td align="left">Class <code class="code">error_condition</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.4</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">19.5.5</td><td align="left">Class <code class="code">system_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 427         <span class="emphasis"><em>20</em></span>
 428       </td><td colspan="3" align="left">
 429         <span class="emphasis"><em>General utilities</em></span>
 430       </td></tr><tr><td align="left">20.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.2</td><td align="left">swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.3</td><td align="left">exchange</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.4</td><td align="left">forward/move helpers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.2.5</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.3</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.4</td><td align="left">Tuples</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5</td><td align="left">Compile-time integer sequences</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.5.2</td><td align="left">Class template <code class="code">integer_sequence</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.5.3</td><td align="left">Alias template <code class="code">make_integer_sequence</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.6</td><td align="left">Class template <code class="code">bitset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.7</td><td align="left">Memory</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.1</td><td align="left">Default deleters</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.2</td><td align="left"><code class="code">unique_ptr</code> for single objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.3</td><td align="left"><code class="code">unique_ptr</code> for array objects with a runtime length</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.4</td><td align="left"><code class="code">unique_ptr</code> creation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.1.5</td><td align="left"><code class="code">unique_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2</td><td align="left">Shared-ownership pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.8.2.1</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.2</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left">Y</td><td align="left">
 431           Uses code from
 432           <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>.
 433       </td></tr><tr><td align="left">20.8.2.3</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.4</td><td align="left">Class template <code class="code">owner_less</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.5</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.6</td><td align="left"><code class="code">shared_ptr</code> atomic access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.2.7</td><td align="left">Smart pointer hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.1</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.2</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.3</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.4</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.5</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.8.6</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.7</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.8</td><td align="left">Negators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.9</td><td align="left">Function object binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.10</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.9.11</td><td align="left">Polymorphic function wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.9.11.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">20.9.11.2</td><td align="left">Class template <code class="code">function</code></td><td align="left">Partial</td><td align="left">Missing allocator support</td></tr><tr><td align="left">20.9.12</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10</td><td align="left">Metaprogramming and type traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.2</td><td align="left">Header <code class="code">&lt;type_traits&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.10.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.10.7</td><td align="left">Transformations between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.11</td><td align="left">Compile-time rational arithmetic</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12</td><td align="left">Time utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">20.12.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.4</td><td align="left">Time-related traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.5.8</td><td align="left">Suffixes for duration literals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.7</td><td align="left">Clocks</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.12.8</td><td align="left">Date and time functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.13</td><td align="left">Scoped allocator adaptor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">20.14</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 434         <span class="emphasis"><em>21</em></span>
 435       </td><td colspan="3" align="left">
 436         <span class="emphasis"><em>Strings</em></span>
 437       </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">Character traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.5</td><td align="left">Numeric Conversions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.7</td><td align="left">Suffixes for <code class="code">basic_string</code> literals</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">21.7</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left">
 438         <span class="emphasis"><em>22</em></span>
 439       </td><td colspan="3" align="left">
 440         <span class="emphasis"><em>Localization</em></span>
 441       </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Header <code class="code">&lt;locale&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.5</td><td align="left">Standard code conversion facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.6</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 442         <span class="emphasis"><em>23</em></span>
 443       </td><td colspan="3" align="left">
 444         <span class="emphasis"><em>Containers</em></span>
 445       </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6</td><td align="left">Container adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 446         <span class="emphasis"><em>24</em></span>
 447       </td><td colspan="3" align="left">
 448         <span class="emphasis"><em>Iterators</em></span>
 449       </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">Header <code class="code">&lt;iterator&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.5</td><td align="left">Iterator adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.6</td><td align="left">Stream iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.7</td><td align="left">range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 450         <span class="emphasis"><em>25</em></span>
 451       </td><td colspan="3" align="left">
 452         <span class="emphasis"><em>Algorithms</em></span>
 453       </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.5</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 454       <span class="emphasis"><em>26</em></span>
 455       </td><td colspan="3" align="left">
 456         <span class="emphasis"><em>Numerics</em></span>
 457       </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4.10</td><td align="left">Suffixes for complex number literals</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">Random number generation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6</td><td align="left">Numeric arrays</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.7</td><td align="left">Generalized numeric operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.8</td><td align="left">C Library</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 458         <span class="emphasis"><em>27</em></span>
 459       </td><td colspan="3" align="left">
 460         <span class="emphasis"><em>Input/output library</em></span>
 461       </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">27.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7.6</td><td align="left">Quoted manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 462         <span class="emphasis"><em>28</em></span>
 463       </td><td colspan="3" align="left">
 464         <span class="emphasis"><em>Regular expressions</em></span>
 465       </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.4</td><td align="left">Header <code class="code">&lt;regex&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">28.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td><td align="left"> </td></tr><tr><td align="left">28.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 466         <span class="emphasis"><em>29</em></span>
 467       </td><td colspan="3" align="left">
 468         <span class="emphasis"><em>Atomic operations</em></span>
 469       </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.2</td><td align="left">Header <code class="code">&lt;atomic&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.3</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.4</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.5</td><td align="left">Atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.6</td><td align="left">Operations on atomic types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.7</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8</td><td align="left">Fences</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 470         <span class="emphasis"><em>30</em></span>
 471       </td><td colspan="3" align="left">
 472         <span class="emphasis"><em>Thread support</em></span>
 473       </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.3</td><td align="left">Threads</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.3.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">30.3.2</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4</td><td align="left">Mutual exclusion</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1</td><td align="left">Mutex requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2</td><td align="left">Mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3</td><td align="left">Timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.1.4</td><td align="left">Shared timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.1.4.1</td><td align="left">Class <code class="code">shared_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2</td><td align="left">Locks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.2.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2.2</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.2.3</td><td align="left">Class template <code class="code">shared_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.3</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4.4</td><td align="left">Call once</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.4.4.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.4.4.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR
 474         66146</a>
 475       </td></tr><tr><td align="left">30.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6</td><td align="left">Futures</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.1</td><td align="left">Overview</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">30.6.2</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.3</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.4</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.5</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.6</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.7</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.8</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6.9</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 476         <span class="emphasis"><em>Appendix D</em></span>
 477       </td><td colspan="3" align="left">
 478         <span class="emphasis"><em>Compatibility features</em></span>
 479       </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with <code class="code">bool</code> operand</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">register</code> keyword</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.3</td><td align="left">Implicit declaration of copy functions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.4</td><td align="left">Dynamic exception specifications</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.8</td><td align="left">Function objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.9</td><td align="left">Binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.10</td><td align="left"><code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.11</td><td align="left">Violating exception-specifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.12</td><td align="left">Random shuffle</td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.ts_status"></a><p class="title"><strong>Table 1.4. C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr bgcolor="#C8B0B0"><td align="left">
 480         <a class="link" href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2013/n3662.html" target="_top">
 481           N3662
 482         </a>
 483       </td><td align="left">C++ Dynamic Arrays</td><td align="left">N</td><td align="left">Array Extensions TS</td></tr><tr><td align="left">
 484         <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3793.html" target="_top">
 485           N3793
 486         </a>
 487       </td><td align="left">A proposal to add a utility class to represent optional objects</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 488         <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3804.html" target="_top">
 489           N3804
 490         </a>
 491       </td><td align="left">Any library proposal</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr bgcolor="#C8B0B0"><td align="left">
 492         <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3866.html" target="_top">
 493           N3866
 494         </a>
 495       </td><td align="left">Invocation type traits, but dropping function_call_operator.</td><td align="left">N</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 496         <a class="link" href="" target="_top">
 497           N3905
 498         </a>
 499       </td><td align="left">Faster string searching (Boyer-Moore et al.)</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 500         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3915.pdf" target="_top">
 501           N3915
 502         </a>
 503       </td><td align="left">apply() call a function with arguments from a tuple</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr bgcolor="#B0B0B0"><td align="left">
 504         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3916.pdf" target="_top">
 505           N3916
 506         </a>
 507       </td><td align="left">Polymorphic memory resources</td><td align="left">Partial (missing pool resource and buffer resource classes)</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 508         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3920.html" target="_top">
 509           N3920
 510         </a>
 511       </td><td align="left">Extending shared_ptr to support arrays</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 512         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3921.html" target="_top">
 513           N3921
 514         </a>
 515       </td><td align="left"><code class="code">string_view</code>: a non-owning reference to a string</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 516         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3925.pdf" target="_top">
 517           N3925
 518         </a>
 519       </td><td align="left">A sample proposal</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 520         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3932.htm" target="_top">
 521           N3932
 522         </a>
 523       </td><td align="left">Variable Templates For Type Traits</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left">
 524         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4100.pdf" target="_top">
 525           N4100
 526         </a>
 527       </td><td align="left">File System</td><td align="left">Y</td><td align="left">
 528         Link with
 529         <a class="link" href="using_dynamic_or_shared.html#manual.intro.using.linkage.experimental" title="Experimental Library Extensions">
 530         <code class="option">-lstdc++fs</code></a>
 531       </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2017"></a>C++ 2017</h3></div></div></div><p>
 532 In this implementation the <code class="literal">-std=gnu++17</code> or
 533 <code class="literal">-std=c++17</code> flag must be used to enable language
 534 and library
 535 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a>
 536 options. The pre-defined symbol
 537 <code class="constant">__cplusplus</code> is used to check for the
 538 presence of the required flag.
 539 </p><p>
 540 This section describes the C++17 and library TS support in mainline GCC,
 541 not in any particular release.
 542 </p><p>
 543 The following table lists new library features that are included in
 544 the C++17 standard. The "Proposal" column provides a link to the
 545 ISO C++ committee proposal that describes the feature, while the "Status"
 546 column indicates the first version of GCC that contains an implementation of
 547 this feature (if it has been implemented).
 548 The "SD-6 Feature Test" column shows the corresponding macro or header from
 549 <a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6:
 550 Feature-testing recommendations for C++</a>.
 551 </p><div class="table"><a id="table.cxx17_features"></a><p class="title"><strong>Table 1.5. C++ 2017 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2017 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test</th></tr></thead><tbody><tr bgcolor="#C8B0B0"><td align="left">
 552         <code class="code">constexpr std::hardware_{constructive,destructive}_interference_size</code>
 553       </td><td align="left">
 554         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0154r1.html" target="_top">
 555         P0154R1
 556         </a>
 557       </td><td align="center"> No </td><td align="left"> <code class="code">__cpp_lib_hardware_interference_size &gt;= 201603</code> </td></tr><tr><td align="left"> Core Issue 1776: Replacement of class objects containing reference members</td><td align="left">
 558         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0137r1.html" target="_top">
 559         P0137R1
 560         </a>
 561       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_launder &gt;= 201606</code> </td></tr><tr><td align="left">Wording for <code class="code">std::uncaught_exceptions</code></td><td align="left">
 562         <a class="link" href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n4259.pdf" target="_top">
 563           N4259
 564         </a>
 565       </td><td align="center">6.1</td><td align="left"><code class="code">__cpp_lib_uncaught_exceptions &gt;= 201411</code></td></tr><tr><td align="left"> C++17 should refer to C11 instead of C99 </td><td align="left">
 566         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0063r3.html" target="_top">
 567         P0063R3
 568         </a>
 569       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Variant: a type-safe union for C++17 </td><td align="left">
 570         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0088r3.html" target="_top">
 571         P0088R3
 572         </a>
 573       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(&lt;variant&gt;)</code>,
 574               <code class="code">__cpp_lib_variant &gt;= 201603</code>
 575               (since 7.3, see Note 1)
 576       </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">optional</code> </td><td align="left">
 577         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 578         P0220R1
 579         </a>
 580       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(&lt;optional&gt;)</code>,
 581               <code class="code">__cpp_lib_optional &gt;= 201603</code>
 582               (since 7.3, see Note 1)
 583       </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">any</code> </td><td align="left">
 584         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 585         P0220R1
 586         </a>
 587       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(&lt;any&gt;)</code>,
 588               <code class="code">__cpp_lib_any &gt;= 201603</code>
 589               (since 7.3, see Note 1)
 590       </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">string_view</code> </td><td align="left">
 591         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 592         P0220R1
 593         </a>
 594       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(&lt;string_view&gt;)</code>,
 595               <code class="code">__cpp_lib_string_view &gt;= 201603</code>
 596               (since 7.3, see Note 1)
 597       </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">memory_resource</code> </td><td align="left">
 598         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 599         P0220R1
 600         </a>
 601       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__has_include(&lt;memory_resource&gt;)</code>,
 602               <code class="code">__cpp_lib_memory_resource &gt;= 201603</code>
 603       </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">apply</code> </td><td align="left">
 604         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 605         P0220R1
 606         </a>
 607       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_apply &gt;= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">shared_ptr&lt;T[]&gt;</code> </td><td align="left">
 608         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 609         P0220R1
 610         </a>
 611       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_shared_ptr_arrays &gt;= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: Searchers </td><td align="left">
 612         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 613         P0220R1
 614         </a>
 615       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_boyer_moore_searcher &gt;= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: Sampling </td><td align="left">
 616         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
 617         P0220R1
 618         </a>
 619       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_sample &gt;= 201603</code> </td></tr><tr><td align="left"> Constant View: A proposal for a <code class="code">std::as_const</code> helper function template      </td><td align="left">
 620         <a class="link" href="" target="_top">
 621         P0007R1
 622         </a>
 623       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_as_const &gt;= 201510 </code></td></tr><tr><td align="left"> Improving pair and tuple </td><td align="left">
 624         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387" target="_top">
 625         N4387
 626         </a>
 627       </td><td align="center"> 6.1 </td><td align="left"> N/A </td></tr><tr><td align="left"> <code class="code">make_from_tuple</code>: apply for construction </td><td align="left">
 628         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0209r2.pdf" target="_top">
 629         P0209R2
 630         </a>
 631       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_make_from_tuple &gt;= 201606 </code></td></tr><tr bgcolor="#C8B0B0"><td align="left">
 632         Removing <code class="code">auto_ptr</code>, <code class="code">random_shuffle()</code>,
 633         And Old <code class="code">&lt;functional&gt;</code> Stuff
 634       </td><td align="left">
 635         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4190.htm" target="_top">
 636           N4190
 637         </a>
 638       </td><td align="center">No (kept for backwards compatibility)</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Deprecating Vestigial Library Parts in C++17 </td><td align="left">
 639         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0174r2.html" target="_top">
 640         P0174R2
 641         </a>
 642       </td><td align="center"> No  (kept for backwards compatibility)</td><td align="left"> </td></tr><tr><td align="left"> Making <code class="code">std::owner_less</code> more flexible </td><td align="left">
 643         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0074r0.html" target="_top">
 644         P0074R0
 645         </a>
 646       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_transparent_operators &gt;= 201510 </code></td></tr><tr><td align="left"> <code class="code">std::addressof</code> should be constexpr </td><td align="left">
 647         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0304r0.html#2296" target="_top">
 648         LWG2296
 649         </a>
 650       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_addressof_constexpr &gt;= 201603 </code></td></tr><tr><td align="left"> Safe conversions in <code class="code">unique_ptr&lt;T[]&gt;</code> </td><td align="left">
 651         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4089.pdf" target="_top">
 652         N4089
 653         </a>
 654       </td><td align="center"> 6 </td><td align="left"> </td></tr><tr><td align="left"> LWG 2228: Missing SFINAE rule in unique_ptr templated assignment </td><td align="left">
 655         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4366.html" target="_top">
 656           N4366
 657         </a>
 658       </td><td align="center"> 6 </td><td align="left"> </td></tr><tr><td align="left"> Re-enabling <code class="code">shared_from_this</code></td><td align="left">
 659         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0033r1.html" target="_top">
 660         P0033R1
 661         </a>
 662       </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_enable_shared_from_this &gt;= 201603</code></td></tr><tr><td align="left"> A proposal to add <code class="code">invoke</code> function template </td><td align="left">
 663         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169.html" target="_top">
 664         N4169
 665         </a>
 666       </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_invoke &gt;= 201411 </code></td></tr><tr><td align="left">TriviallyCopyable <code class="code">reference_wrapper</code> </td><td align="left">
 667         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4277.html" target="_top">
 668           N4277
 669         </a>
 670       </td><td align="center"> 5.1 </td><td align="left"> </td></tr><tr><td align="left"> Adopt <code class="code">not_fn</code> from Library Fundamentals 2 for C++17 </td><td align="left">
 671         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0005r4.html" target="_top">
 672         P0005R4
 673         </a>
 674       </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_not_fn &gt;= 201603</code></td></tr><tr><td align="left"> Fixes for <code class="code">not_fn</code> </td><td align="left">
 675         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0358r1.html" target="_top">
 676         P0358R1
 677         </a>
 678       </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left"> Fixing a design mistake in the searchers interface in Library Fundamentals </td><td align="left">
 679         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0253r1.pdf" target="_top">
 680         P0253R1
 681         </a>
 682       </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left"> Extending memory management tools </td><td align="left">
 683         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0040r3.html" target="_top">
 684         P0040R3
 685         </a>
 686       </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_raw_memory_algorithms &gt;= 201606L</code></td></tr><tr><td align="left"> <code class="code">shared_ptr::weak_type</code></td><td align="left">
 687         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0163r0.html" target="_top">
 688         P0163R0
 689         </a>
 690       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_shared_ptr_weak_type &gt;= 201606</code></td></tr><tr><td align="left">Transformation Trait Alias <code class="code">void_t</code></td><td align="left">
 691         <a class="link" href="http://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n3911.pdf" target="_top">
 692           N3911
 693         </a>
 694       </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_void_t &gt;= 201411</code></td></tr><tr><td align="left"> Wording for <code class="code">bool_constant</code>, revision 1 </td><td align="left">
 695         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4389.html" target="_top">
 696           N4389
 697         </a>
 698       </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_bool_constant &gt;= 201505</code></td></tr><tr><td align="left"> Adopt Type Traits Variable Templates from Library Fundamentals TS for C++17</td><td align="left">
 699         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0006r0.html" target="_top">
 700         P0006R0
 701         </a>
 702       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_type_trait_variable_templates &gt;= 201510 </code></td></tr><tr><td align="left"> Logical Operator Type Traits</td><td align="left">
 703         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0013r1.html" target="_top">
 704         P0013R1
 705         </a>
 706       </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_logical_traits &gt;= 201510 </code></td></tr><tr><td align="left"> Adding [nothrow-]swappable traits </td><td align="left">
 707         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0185r1.html" target="_top">
 708         P0185R1
 709         </a>
 710       </td><td align="center"> 7 (<code class="code">__is_swappable</code> available since 6.1)</td><td align="left"><code class="code"> __cpp_lib_is_swappable &gt;= 201603 </code></td></tr><tr><td align="left"> <code class="code">is_callable</code>, the missing INVOKE related trait</td><td align="left">
 711         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0077r2.html" target="_top">
 712         P0077R2
 713         </a>
 714       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_is_invocable &gt;= 201703 </code></td></tr><tr><td align="left"> has_unique_object_representations </td><td align="left">
 715         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0258r2.html" target="_top">
 716         P0258R2
 717         </a>
 718       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_has_unique_object_representations &gt;= 201606 </code></td></tr><tr><td align="left"> Polishing <code class="code">&lt;chrono&gt;</code> </td><td align="left">
 719         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0092r1.html" target="_top">
 720         P0092R1
 721         </a>
 722       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_chrono &gt;= 201510 </code></td></tr><tr><td align="left"> Adding more constexpr to <code class="code">&lt;chrono&gt;</code> </td><td align="left">
 723         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0505r0.html" target="_top">
 724         P0505R0
 725         </a>
 726       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_chrono &gt;= 201611 </code>
 727              (since 7.3, see Note 2)
 728       </td></tr><tr><td align="left"> Constexpr for <code class="code">std::char_traits</code> </td><td align="left">
 729         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0426r1.html" target="_top">
 730         P0426R1
 731         </a>
 732       </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_constexpr_char_traits &gt;= 201611 </code></td></tr><tr><td align="left"> Integrating <code class="code">std::string_view</code> and <code class="code">std::string</code> </td><td align="left">
 733         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0254r2.pdf" target="_top">
 734         P0254R2
 735         </a>
 736       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> </code></td></tr><tr><td align="left"> Give 'std::string' a non-const '.data()' member function </td><td align="left">
 737         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0272r1.html" target="_top">
 738         P0272R1
 739         </a>
 740       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> </code></td></tr><tr><td align="left">Cleaning-up noexcept in the Library</td><td align="left">
 741         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4258.pdf" target="_top">
 742           N4258
 743         </a>
 744       </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_allocator_traits_is_always_equal &gt;= 201411 </code></td></tr><tr><td align="left">Contiguous Iterators </td><td align="left">
 745         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4284.html" target="_top">
 746           N4284
 747         </a>
 748       </td><td align="center">N/A</td><td align="left"> </td></tr><tr><td align="left"> Minimal incomplete type support for standard containers </td><td align="left">
 749         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4510.html" target="_top">
 750         N4510
 751         </a>
 752       </td><td align="center"> 3.0 </td><td align="left"><code class="code"> __cpp_lib_incomplete_container_elements &gt;= 201505 </code>
 753              (since 6.2, see Note 2)
 754       </td></tr><tr><td align="left"> Emplace return type </td><td align="left">
 755         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r2.pdf" target="_top">
 756         P0084R2
 757         </a>
 758       </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left">Improved insertion interface for unique-key maps</td><td align="left">
 759         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4279.html" target="_top">
 760           N4279
 761         </a>
 762       </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_map_try_emplace &gt;= 201411</code>,
 763              <code class="code"> __cpp_lib_unordered_map_try_emplace &gt;= 201411</code>
 764       </td></tr><tr><td align="left"> Splicing Maps and Sets </td><td align="left">
 765         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0083r3.pdf" target="_top">
 766         P0083R3
 767         </a>
 768       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_node_extract &gt;= 201606 </code></td></tr><tr><td align="left">Non-member <code class="code">size()</code> and more</td><td align="left">
 769         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4280.pdf" target="_top">
 770           N4280
 771         </a>
 772       </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_nonmember_container_access &gt;= 201411 </code></td></tr><tr><td align="left"> A Proposal to Add Constexpr Modifiers to <code class="code">reverse_iterator</code>, <code class="code">move_iterator</code>, <code class="code">array</code> and Range Access </td><td align="left">
 773         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0031r0.html" target="_top">
 774         P0031R0
 775         </a>
 776       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_array_constexpr &gt;= 201603 </code></td></tr><tr bgcolor="#B0B0B0"><td align="left"> The Parallelism TS Should be Standardized   </td><td align="left">
 777         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0024r2.html" target="_top">
 778         P0024R2
 779         </a>
 780       </td><td align="center"> 9.1 </td><td align="left"><code class="code"> __has_include(&lt;execution&gt;) </code>,
 781              <code class="code"> __cpp_lib_execution &gt;= 201603 </code>,
 782              <code class="code"> __cpp_lib_parallel_algorithm &gt;= 201603 </code>
 783              (requires linking with <code class="code">-ltbb</code>, see Note 3)
 784       </td></tr><tr><td align="left"> An algorithm to "clamp" a value between a pair of boundary values </td><td align="left">
 785         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0025r0.html" target="_top">
 786         P0025R0
 787         </a>
 788       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_clamp &gt;= 201603 </code></td></tr><tr><td align="left"> Adopt Selected Library Fundamentals V2 Components for C++17 </td><td align="left">
 789         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0295r0.pdf" target="_top">
 790         P0295R0
 791         </a>
 792       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_gcd_lcm &gt;= 201606 </code></td></tr><tr><td align="left"> Proposal to Introduce a 3-Argument Overload to <code class="code">std::hypot</code> </td><td align="left">
 793         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0030r1.pdf" target="_top">
 794         P0030R1
 795         </a>
 796       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_hypot &gt;= 201603 </code></td></tr><tr><td align="left"> Mathematical Special Functions for C++17 </td><td align="left">
 797         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0226r1.pdf" target="_top">
 798         P0226R1
 799         </a>
 800       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_math_special_functions &gt;= 201603 </code>
 801              (see Note 4)
 802       </td></tr><tr><td align="left">Adopt the File System TS for C++17  </td><td align="left">
 803         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0218r1.html" target="_top">
 804         P0218R1
 805         </a>
 806       </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __has_include(&lt;filesystem&gt;) </code>,
 807              <code class="code"> __cpp_lib_filesystem &gt;= 201603 </code>
 808              (GCC 8.x requires linking with <code class="code">-lstdc++fs</code>)
 809       </td></tr><tr><td align="left"> Relative Paths for Filesystem</td><td align="left">
 810         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0219r1.html" target="_top">
 811         P0219R1
 812         </a>
 813       </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem &gt;= 201606 </code></td></tr><tr><td align="left"> Adapting string_view by filesystem paths </td><td align="left">
 814         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0392r0.pdf" target="_top">
 815         P0392R0
 816         </a>
 817       </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem &gt;= 201606 </code></td></tr><tr><td align="left"> Directory Entry Caching for Filesystem </td><td align="left">
 818        <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0317r1.html" target="_top">
 819        P0317R1
 820        </a>
 821       </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem &gt;= 201703 </code></td></tr><tr><td align="left"> constexpr <code class="code">atomic&lt;T&gt;::is_always_lock_free</code>   </td><td align="left">
 822         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0152r1.html" target="_top">
 823         P0152R1
 824         </a>
 825       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_atomic_is_always_lock_free &gt;= 201603 </code></td></tr><tr><td align="left">A proposal to add <code class="code">shared_mutex</code> (untimed) (Revision 4)</td><td align="left">
 826         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4508.html" target="_top">
 827           N4508
 828         </a>
 829       </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_shared_mutex &gt;= 201505 </code></td></tr><tr><td align="left"> Variadic <code class="code">lock_guard</code> (Rev. 5) </td><td align="left">
 830         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0156r2.html" target="_top">
 831         P0156R2
 832         </a>
 833       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_scoped_lock &gt;= 201703 </code></td></tr><tr><td align="left"> A byte type definition </td><td align="left">
 834         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0298r3.pdf" target="_top">
 835         P0298R3
 836         </a>
 837       </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_byte &gt;= 201603 </code> (since 7.3, see Note 2)
 838       </td></tr><tr bgcolor="#B0B0B0"><td align="left"> Elementary string conversions </td><td align="left">
 839         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0067r5.html" target="_top">
 840         P0067R5
 841         </a>
 842       </td><td align="center"> 8.1 (only integral types supported) </td><td align="left"><code class="code"> __has_include(&lt;charconv&gt;) </code>
 843              <code class="code"> __cpp_lib_to_chars &gt;= 201611 </code></td></tr><tr><td align="left"> Homogeneous interface for variant, any and optional </td><td align="left">
 844         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0032r3.pdf" target="_top">
 845         P0032R3
 846         </a>
 847       </td><td align="center"> 7.1  </td><td align="left">
 848              <code class="code"> __cpp_lib_any &gt;= 201606 </code>,
 849              <code class="code"> __cpp_lib_optional &gt;= 201606 </code>,
 850              <code class="code"> __cpp_lib_variant &gt;= 201606 </code>
 851       </td></tr><tr><td align="left"> Making Optional Greater Equal Again </td><td align="left">
 852         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0307r2.pdf" target="_top">
 853         P0307R2
 854         </a>
 855       </td><td align="center"> 7.1  </td><td align="left"> <code class="code"> __cpp_lib_optional &gt;= 201606 </code> </td></tr></tbody></table></div></div><br class="table-break" /><p>
 856 Note 1: This feature is supported in GCC 7.1 and 7.2 but before GCC 7.3 the
 857 <code class="code">__cpp_lib</code> macro is not defined, and compilation will fail if the
 858 header is included without using <code class="option">-std</code> to enable C++17 support.
 859 </p><p>
 860 Note 2: This feature is supported in older releases but the
 861 <code class="code">__cpp_lib</code> macro is not defined to the right value
 862 (or not defined at all) until the version shown in parentheses.
 863 </p><p>
 864 Note 3: The Parallel Algorithms have an external dependency on Intel TBB 2018
 865 or later. If the <code class="filename">&lt;execution&gt;</code>
 866 header is included then <code class="code">-ltbb</code> must be used to link to TBB.
 867 </p><p>
 868 Note 4: The mathematical special functions are enabled in C++17 mode from
 869 GCC 7.1 onwards. For GCC 6.x or for C++11/C++14 define
 870 <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code> to a non-zero value
 871 and test for <code class="code">__STDCPP_MATH_SPEC_FUNCS__ &gt;= 201003L</code>.
 872 </p><p>
 873 The following status table is based on the table of contents of
 874 ISO/IEC 14882:2017.
 875 Some subclauses are not shown in the table where the content is unchanged
 876 since C++14 and the implementation is complete.
 877 </p><div class="table"><a id="table.cxx17_status"></a><p class="title"><strong>Table 1.6. C++ 2017 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2017 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
 878         <span class="emphasis"><em>21</em></span>
 879       </td><td colspan="3" align="left">
 880         <span class="emphasis"><em>Language support</em></span>
 881       </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.2</td><td align="left">Common definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3</td><td align="left">Implementation properties</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3.2</td><td align="left">Header <code class="code">&lt;limits&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.3.3</td><td align="left">Floating-point type properties</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">21.3.3.1</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">21.3.3.2</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">21.3.4</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3.5</td><td align="left">Header <code class="code">&lt;climits&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.3.6</td><td align="left">Header <code class="code">&lt;cfloat&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.4</td><td align="left">Integer types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.4.1</td><td align="left">Header <code class="code">&lt;cstdint&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">21.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">21.6</td><td align="left">Dynamic memory management</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.6.1</td><td align="left">Header <code class="code">&lt;new&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.6.2</td><td align="left">Storage allocation and deallocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6.3</td><td align="left">Storage allocation errors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.6.4</td><td align="left">Pointer optimization barrier</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">21.6.5</td><td align="left">Hardware interference size</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">21.7</td><td align="left">Type identification</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8</td><td align="left">Exception handling</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.8.1</td><td align="left">Header <code class="code">&lt;exception&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">21.8.2</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.3</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.4</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.5</td><td align="left"><code class="code">uncaught_exceptions</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.6</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.8.7</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.9</td><td align="left">Initializer lists</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">21.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 882         <span class="emphasis"><em>22</em></span>
 883       </td><td colspan="3" align="left">
 884         <span class="emphasis"><em>Diagnostics</em></span>
 885       </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">22.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">22.5</td><td align="left">System error support</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">
 886         <span class="emphasis"><em>23</em></span>
 887       </td><td colspan="3" align="left">
 888         <span class="emphasis"><em>General utilities</em></span>
 889       </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2</td><td align="left">Utility components</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.1</td><td align="left">Header <code class="code">&lt;utility&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.2.2</td><td align="left">Operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.3</td><td align="left"><code class="code">swap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.4</td><td align="left"><code class="code">exchange</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.5</td><td align="left">Forward/move helpers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.6</td><td align="left">Function template <code class="code">as_const</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.2.7</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">23.2.8</td><td align="left">Primitive numeric output conversion</td><td align="left">Partial</td><td align="left">Only integer types supported, not floating-point types</td></tr><tr bgcolor="#B0B0B0"><td align="left">23.2.9</td><td align="left">Primitive numeric input conversion</td><td align="left">Partial</td><td align="left">Only integer types supported, not floating-point types</td></tr><tr><td align="left">23.3</td><td align="left">Compile-time integer sequences</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.4</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.5</td><td align="left">Tuples</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.6</td><td align="left">Optional objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.7</td><td align="left">Variants</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.8</td><td align="left">Storage for any type</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.9</td><td align="left">Bitsets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10</td><td align="left">Memory</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.10.2</td><td align="left">Header <code class="code">&lt;memory&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.3</td><td align="left">Pointer traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.4</td><td align="left">Pointer safety</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.5</td><td align="left">Align</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.6</td><td align="left">Allocator argument tag</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.7</td><td align="left"><code class="code">uses_allocator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.8</td><td align="left">Allocator traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.10</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.10.11</td><td align="left">C library memory allocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.11</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.11.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.11.2</td><td align="left">Shared-ownership pointers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12</td><td align="left">Memory resources</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.12.1</td><td align="left">Header <code class="code">&lt;memory_resource&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.2</td><td align="left">Class <code class="code">memory_resource</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.3</td><td align="left">Class template <code class="code">polymorphic_allocator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.4</td><td align="left">Access to program-wide <code class="code">memory_resource</code> objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.5</td><td align="left">Pool resource classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.12.6</td><td align="left">Class <code class="code">monotonic_buffer_resource</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.13</td><td align="left">Class template <code class="code">scoped_allocator_adaptor</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14</td><td align="left">Function objects</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.1</td><td align="left">Header <code class="code">&lt;functional&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.2</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.3</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.14.4</td><td align="left">Function template <code class="code">invoke</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.5</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.6</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.7</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.8</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.9</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.10</td><td align="left">Function template <code class="code">not_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.11</td><td align="left">Function object binders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.12</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.13</td><td align="left">Polymorphic function wrappers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.14</td><td align="left">Searchers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.14.15</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15</td><td align="left">Metaprogramming and type traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.15.1</td><td align="left">Requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.15.2</td><td align="left">Header <code class="code">&lt;type_traits&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.7</td><td align="left">Transformations between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.15.8</td><td align="left">Logical operator traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.16</td><td align="left">Compile-time rational arithmetic</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.17.2</td><td align="left">Header <code class="code">&lt;chrono&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.17</td><td align="left">Time utilities</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.17.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.4</td><td align="left">Time-related traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.7</td><td align="left">Clocks</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.17.8</td><td align="left">Header <code class="code">&lt;ctime&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.18</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19</td><td align="left">Execution policies</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.19.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.19.2</td><td align="left">Header <code class="code">&lt;execution&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">23.19.3</td><td align="left">Execution policy type trait</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.4</td><td align="left">Sequenced execution policy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.5</td><td align="left">Parallel execution policy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.6</td><td align="left">Parallel and unsequenced execution policy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">23.19.7</td><td align="left">Execution policy objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 890         <span class="emphasis"><em>24</em></span>
 891       </td><td colspan="3" align="left">
 892         <span class="emphasis"><em>Strings</em></span>
 893       </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">24.2</td><td align="left">Character traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4</td><td align="left">String view classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.1</td><td align="left">Header <code class="code">&lt;string_view&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.2</td><td align="left">Class template <code class="code">basic_string_view</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.3</td><td align="left">Non-member comparison functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.4</td><td align="left">Inserters and extractors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.5</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">24.4.6</td><td align="left">Suffix for <code class="code">basic_string_view</code> literals</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">24.5</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left">
 894         <span class="emphasis"><em>25</em></span>
 895       </td><td colspan="3" align="left">
 896         <span class="emphasis"><em>Localization</em></span>
 897       </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.2</td><td align="left">Header <code class="code">&lt;locale&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.3</td><td align="left">Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">25.5</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 898         <span class="emphasis"><em>26</em></span>
 899       </td><td colspan="3" align="left">
 900         <span class="emphasis"><em>Containers</em></span>
 901       </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">26.2</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">26.6</td><td align="left">Container adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 902         <span class="emphasis"><em>27</em></span>
 903       </td><td colspan="3" align="left">
 904         <span class="emphasis"><em>Iterators</em></span>
 905       </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.3</td><td align="left">Header <code class="code">&lt;iterator&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.5</td><td align="left">Iterator adaptors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.6</td><td align="left">Stream iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.7</td><td align="left">Range access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">27.8</td><td align="left">Container access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 906         <span class="emphasis"><em>28</em></span>
 907       </td><td colspan="3" align="left">
 908         <span class="emphasis"><em>Algorithms</em></span>
 909       </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">28.2</td><td align="left">Header <code class="code">&lt;algorithm&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">28.3</td><td align="left">Algorithms requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">28.4</td><td align="left">Parallel algorithms</td><td align="left"> </td><td align="left">Using <a class="link" href="https://github.com/oneapi-src/oneDPL" target="_top">oneAPI DPC++ Library</a></td></tr><tr><td align="left">28.5</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.6</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.7</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">28.8</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 910       <span class="emphasis"><em>29</em></span>
 911       </td><td colspan="3" align="left">
 912         <span class="emphasis"><em>Numerics</em></span>
 913       </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.2</td><td align="left">Definitions</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.3</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.4</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.5</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.6</td><td align="left">Random number generation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.7</td><td align="left">Numeric arrays</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8</td><td align="left">Generalized numeric operations</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.8.1</td><td align="left">Header <code class="code">&lt;numeric&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.8.2</td><td align="left">Accumulate</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.3</td><td align="left">Reduce</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.4</td><td align="left">Inner product</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.5</td><td align="left">Transform reduce</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.6</td><td align="left">Partial sum</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.7</td><td align="left">Exclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.8</td><td align="left">Inclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.9</td><td align="left">Transform exclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.10</td><td align="left">Transform inclusive scan</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.11</td><td align="left">Adjacent difference</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.12</td><td align="left">Iota</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.13</td><td align="left">Greatest common divisor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.8.14</td><td align="left">Least common multiple</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9</td><td align="left">Mathematical functions for floating-point types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.9.1</td><td align="left">Header <code class="code">&lt;cmath&gt;</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">29.9.2</td><td align="left">Absolute values</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9.3</td><td align="left">Three-dimensional hypotenuse</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9.4</td><td align="left">Classification / comparison functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">29.9.5</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 914         <span class="emphasis"><em>30</em></span>
 915       </td><td colspan="3" align="left">
 916         <span class="emphasis"><em>Input/output library</em></span>
 917       </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">30.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"> </td></tr><tr><td align="left">30.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.10</td><td align="left">File systemss</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">30.11</td><td align="left">C library files</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 918         <span class="emphasis"><em>31</em></span>
 919       </td><td colspan="3" align="left">
 920         <span class="emphasis"><em>Regular expressions</em></span>
 921       </td></tr><tr><td align="left">31.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.4</td><td align="left">Header <code class="code">&lt;regex&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">31.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td><td align="left"> </td></tr><tr><td align="left">31.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">31.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 922         <span class="emphasis"><em>32</em></span>
 923       </td><td colspan="3" align="left">
 924         <span class="emphasis"><em>Atomic operations</em></span>
 925       </td></tr><tr><td align="left">32.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.2</td><td align="left">Header <code class="code">&lt;atomic&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.3</td><td align="left">Type aliases</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.4</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.5</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.6</td><td align="left">Class template <code class="code">&lt;atomic&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.7</td><td align="left">Non-member functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.8</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">32.9</td><td align="left">Fences</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 926         <span class="emphasis"><em>33</em></span>
 927       </td><td colspan="3" align="left">
 928         <span class="emphasis"><em>Thread support</em></span>
 929       </td></tr><tr><td align="left">33.1</td><td align="left">General</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.3</td><td align="left">Threads</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.3.1</td><td align="left">Header <code class="code">thread</code> synopsis</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.3.2</td><td align="left">Class <code class="code">thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">33.3.2.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">33.3.3</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4</td><td align="left">Mutual exclusion</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3</td><td align="left">Mutex requirements</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.1</td><td align="left">In general</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.2</td><td align="left">Mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.3</td><td align="left">Timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.4</td><td align="left">Shared mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.4.1</td><td align="left">Class <code class="code">shared_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.3.5</td><td align="left">Shared timed mutex types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.3.5.1</td><td align="left">Class <code class="code">shared_timed_mutex</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4</td><td align="left">Locks</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.4.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4.2</td><td align="left">Class template <code class="code">scoped_guard</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4.3</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.4.4</td><td align="left">Class template <code class="code">shared_lock</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.5</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.4.6</td><td align="left">Call once</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.4.6.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">33.4.6.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR
 930         66146</a>
 931       </td></tr><tr><td align="left">33.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6</td><td align="left">Futures</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.6.1</td><td align="left">Overview</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.6.2</td><td align="left">Header <code class="code">&lt;future&gt;</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">33.6.3</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.4</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.5</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.6</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.7</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.8</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.9</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">33.6.10</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">
 932         <span class="emphasis"><em>Appendix D</em></span>
 933       </td><td colspan="3" align="left">
 934         <span class="emphasis"><em>Compatibility features</em></span>
 935       </td></tr><tr><td align="left">D.4</td><td align="left">C++ standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code">&lt;ccomplex&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code">&lt;cstdalign&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code">&lt;cstdbool&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code">&lt;ctgmath&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.6</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.8</td><td align="left">Old adaptable function bindings</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.10</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.11</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.12</td><td align="left">Deprecated type traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.13</td><td align="left">Deprecated iterator primitives</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.14</td><td align="left">Deprecated <code class="code">shared_ptr</code> observers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.15</td><td align="left">Deprecated standard code conversion facets</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">D.16</td><td align="left">Deprecated convenience conversion interfaces</td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.cxx17_ts_status"></a><p class="title"><strong>Table 1.7. C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
 936         <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4076.html" target="_top">
 937           N4076
 938         </a>
 939       </td><td align="left">A generalized callable negator</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 940         <a class="link" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4273.htm" target="_top">
 941           N4273
 942         </a>
 943       </td><td align="left">Uniform Container Erasure</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 944         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4061.pdf" target="_top">
 945           N4061
 946         </a>
 947       </td><td align="left">Greatest Common Divisor and Least Common Multiple</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 948         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4066.htm" target="_top">
 949           N4066
 950         </a>
 951       </td><td align="left">Delimited iterators</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 952         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4282.pdf" target="_top">
 953           N4282
 954         </a>
 955       </td><td align="left">The World's Dumbest Smart Pointer</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 956         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4388.html" target="_top">
 957           N4388
 958         </a>
 959       </td><td align="left">Const-Propagating Wrapper</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 960         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4391.html" target="_top">
 961           N4391
 962         </a>
 963       </td><td align="left"> <code class="code">make_array</code>, revision 4 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 964         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf" target="_top">
 965           N4502
 966         </a>
 967       </td><td align="left"> Support for the C++ Detection Idiom, V2 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 968         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4519.pdf" target="_top">
 969           N4519
 970         </a>
 971       </td><td align="left"> Source-Code Information Capture </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr bgcolor="#C8B0B0"><td align="left">
 972         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4521.html" target="_top">
 973           N4521
 974         </a>
 975       </td><td align="left"> Merge Fundamentals V1 into V2 </td><td align="left">
 976         N (components from V1 are still in namespace
 977         <code class="code">fundamentals_v1</code>)
 978       </td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 979         <a class="link" href="http://open-std.org/JTC1/SC22/WG21/docs/papers/2015/p0013r1.html" target="_top">
 980           P0013R1
 981         </a>
 982       </td><td align="left">Logical Operator Type Traits (revision 1)</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left">
 983         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4531.html" target="_top">
 984           N4531
 985         </a>
 986       </td><td align="left">std::rand replacement, revision 3</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2017.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is also specified by previous standards,
 987       see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation
 988       Specific Behavior</a> and <a class="link" href="status.html#iso.2011.specific" title="Implementation Specific Behavior">C++
 989       2011 Implementation Specific Behavior</a>. This section only
 990       documents behaviour which is new in the 2017 standard.
 991    </p><p>
 992       <span class="emphasis"><em>20.5.1.2 [headers]</em></span>
 993       Whether names from Annex K are declared by C++ headers depends on
 994       whether the underlying C library supports Annex K and declares the
 995       names. For the GNU C library, there is no Annex K support and so
 996       none of its names are declared by C++ headers.
 997    </p><p>
 998       <span class="emphasis"><em>23.6.5 [optional.bad_optional_access]</em></span>
 999       <code class="code">what()</code> returns <code class="literal">"bad optional access"</code>.
1000    </p><p>
1001       <span class="emphasis"><em>23.7.3 [variant.variant]</em></span>
1002       <code class="classname">variant</code> supports over-aligned types.
1003    </p><p>
1004       <span class="emphasis"><em>23.7.10 [variant.bad.access]</em></span>
1005       <code class="code">what()</code> returns one of the strings
1006       <code class="literal">"std::get: variant is valueless"</code>,
1007       <code class="literal">"std::get: wrong index for variant"</code>,
1008       <code class="literal">"std::visit: variant is valueless"</code>,
1009       or <code class="literal">"std::visit&lt;R&gt;: variant is valueless"</code>.
1010    </p><p>
1011       <span class="emphasis"><em>23.12.5.2 [memory.resource.pool.options]</em></span>
1012       Let S equal <code class="code">numeric_limits&lt;size_t&gt;::digits</code>.
1013       The limit for maximum number of blocks in a chunk is given by
1014       <span class="mathphrase">2<sup>N</sup>-1</span>,
1015       where N is <span class="mathphrase">min(19, 3 + S/2)</span>.
1016       The largest allocation size that will be allocated from a pool is
1017       <span class="mathphrase">2<sup>22</sup></span>
1018       when <span class="mathphrase">S &gt; 20</span>,
1019       otherwise 3072 when <span class="mathphrase">S &gt; 16</span>,
1020       otherwise 768.
1021    </p><p>
1022       <span class="emphasis"><em>23.12.6.1 [memory.resource.monotonic.buffer.ctor]</em></span>
1023       The default <code class="code">next_buffer_size</code> is <code class="code">128 * sizeof(void*)</code>.
1024       The default growth factor is <code class="code">1.5</code>.
1025    </p><p>
1026       <span class="emphasis"><em>23.15.4.3 [meta.unary.prop]</em></span>
1027       The predicate condition for
1028       <code class="code">has_unique_object_representations</code> is true for all scalar
1029       types except floating point types.
1030    </p><p>
1031       <span class="emphasis"><em>23.19.3 [execpol.type],
1032       28.4.3 [algorithms.parallel.exec]</em></span>
1033       There are no implementation-defined execution policies.
1034    </p><p>
1035       <span class="emphasis"><em>24.4.2 [string.view.template]</em></span>
1036       <code class="classname">basic_string_view&lt;C, T&gt;::iterator</code> is
1037       <code class="code">C*</code> and
1038       <code class="classname">basic_string_view&lt;C, T&gt;::const_iterator</code> is
1039       <code class="code">const C*</code>.
1040    </p><p>
1041       <span class="emphasis"><em>28.4.3 [algorithms.parallel.exec]</em></span>
1042       Threads of execution created by <code class="classname">std::thread</code>
1043       provide concurrent forward progress guarantees, so threads of execution
1044       implicitly created by the library will provide parallel forward
1045       progress guarantees.
1046    </p><p>
1047       <span class="emphasis"><em>29.4.1 [cfenv.syn]</em></span>
1048       The effects of the <code class="filename">&lt;cfenv&gt;</code> functions
1049       depends on whether the <code class="code">FENV_ACCESS</code> pragma is supported,
1050       and on the C library that provides the header.
1051    </p><p>
1052       <span class="emphasis"><em>29.6.9 [c.math.rand]</em></span>
1053       Whether the <code class="function">rand</code> function may introduce data
1054       races depends on the target C library that provides the function.
1055    </p><p>
1056       <span class="emphasis"><em>29.9.5 [sf.cmath]</em></span>
1057       The effect of calling the mathematical special functions with large
1058       inputs should be documented here.
1059    </p><p>
1060       <span class="emphasis"><em>30.10.2.1 [fs.conform.9945]</em></span>
1061       The behavior of the filesystem library implementation will depend on
1062       the target operating system. Some features will not be supported
1063       on some targets.
1064    </p><p>
1065       <span class="emphasis"><em>30.10.5 [fs.filesystem.syn]</em></span>
1066       The clock used for file times is an unspecified type
1067       with a signed 64-bit representation, capable of representing
1068       timestamps with nanosecond resolution. The clock's epoch is
1069       unspecified, but is not the same as the system clock's epoch.
1070    </p><p>
1071       <span class="emphasis"><em>30.10.7.1 [fs.path.generic]</em></span>
1072       dot-dot in the root-directory refers to the root-directory itself.
1073       On Windows, a drive specifier such as <code class="code">"C:"</code> or
1074       <code class="code">"z:"</code> is treated as a root-name. On Cygwin, a path
1075       that begins with two successive directory separators is a
1076       root-name. Otherwise (for POSIX-like systems other than Cygwin),
1077       the implementation-defined root-name is an unspecified string
1078       which does not appear in any pathnames.
1079    </p><p>
1080       <span class="emphasis"><em>30.10.10.1 [fs.enum.path.format]</em></span>
1081       The character sequence is always interpreted in the native pathname
1082       format.
1083    </p><p>
1084       <span class="emphasis"><em>30.10.15.4 [fs.op.file_size]</em></span>
1085       If <code class="code">!is_regular_file(p)</code>, an error is reported.
1086    </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2020"></a>C++ 2020</h3></div></div></div><p>
1087 In this implementation the <code class="literal">-std=gnu++2a</code> or
1088 <code class="literal">-std=c++2a</code> flag must be used to enable language
1089 and library
1090 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a>
1091 options. The pre-defined symbol
1092 <code class="constant">__cplusplus</code> is used to check for the
1093 presence of the required flag.
1094 </p><p>
1095 This section describes the C++20 and library TS support in mainline GCC,
1096 not in any particular release.
1097 </p><p>
1098 The following table lists new library features that have been accepted into
1099 the C++20 working draft. The "Proposal" column provides a link to the
1100 ISO C++ committee proposal that describes the feature, while the "Status"
1101 column indicates the first version of GCC that contains an implementation of
1102 this feature (if it has been implemented).
1103 A dash (—) in the status column indicates that the changes in the proposal
1104 either do not affect the code in libstdc++, or the changes are not required for conformance.
1105 The "SD-6 Feature Test / Notes" column shows the corresponding macro or header from
1106 <a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6:
1107 Feature-testing recommendations for C++</a> (where applicable)
1108 or any notes about the implementation.
1109 </p><div class="table"><a id="table.cxx20_features"></a><p class="title"><strong>Table 1.8. C++ 2020 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2020 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test / Notes</th></tr></thead><tbody><tr><td colspan="4" align="left">
1110         <span class="bold"><strong>Compile-time programming</strong></span>
1111       </td></tr><tr><td align="left">  Add constexpr modifiers to functions in <code class="code">&lt;algorithm&gt;</code> and <code class="code">&lt;utility&gt;</code> Headers </td><td align="left">
1112         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0202r3.html" target="_top">
1113         P0202R3 </a>
1114       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_algorithms &gt;= 201703L</code> </td></tr><tr><td align="left">  Constexpr for <code class="code">swap</code> and swap related functions </td><td align="left">
1115         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0879r0.html" target="_top">
1116         P0879R0 </a>
1117       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_algorithms &gt;= 201806L</code> </td></tr><tr><td align="left">  Constexpr for <code class="code">std::complex</code> </td><td align="left">
1118         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0415r1.html" target="_top">
1119         P0415R1 </a>
1120       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_complex &gt;= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left">  P0595R2 <code class="code">std::is_constant_evaluated()</code> </td><td align="left">
1121         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0595r2.html" target="_top">
1122         P0595R2 </a>
1123       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_is_constant_evaluated &gt;= 201811L</code> </td></tr><tr><td align="left">  More constexpr containers </td><td align="left">
1124         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0784r7.html" target="_top">
1125         P0784R7 </a>
1126       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_dynamic_alloc &gt;= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Making <code class="code">std::string</code> constexpr </td><td align="left">
1127         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0980r1.pdf" target="_top">
1128         P0980R1 </a>
1129       </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_constexpr_string &gt;= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Making <code class="code">std::vector</code> constexpr </td><td align="left">
1130         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1004r2.pdf" target="_top">
1131         P1004R2 </a>
1132       </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_constexpr_vector &gt;= 201907L</code> </td></tr><tr><td align="left">  Constexpr in <code class="code">std::pointer_traits</code> </td><td align="left">
1133         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1006r1.pdf" target="_top">
1134         P1006R1 </a>
1135       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_memory &gt;= 201811L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left">  constexpr for <code class="code">&lt;numeric&gt;</code> algorithms </td><td align="left">
1136         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1645r1.html" target="_top">
1137         P1645R1 </a>
1138       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_numeric &gt;= 201911L</code> </td></tr><tr><td align="left">  Constexpr iterator requirements </td><td align="left">
1139         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0858r0.html" target="_top">
1140         P0858R0 </a>
1141       </td><td align="center"> 9.1 </td><td align="left">
1142         <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_array_constexpr &gt;= 201803L</code> </td></tr><tr><td> <code class="code">__cpp_lib_string_view &gt;= 201803L</code> </td></tr><tr><td> (both since 9.4, see Note 1) </td></tr></tbody></table></div>
1143       </td></tr><tr><td align="left">  <code class="code">constexpr</code> comparison operators for <code class="code">std::array</code> </td><td align="left">
1144         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1023r0.pdf" target="_top">
1145         P1023R0 </a>
1146       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_array_constexpr &gt;= 201806</code> </td></tr><tr><td align="left">  Misc constexpr bits </td><td align="left">
1147         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1032r1.html" target="_top">
1148         P1032R1 </a>
1149       </td><td align="center"> 10.1 </td><td align="left">
1150         <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_array_constexpr &gt;= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_functional &gt;= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_iterator &gt;= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_string_view &gt;= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_tuple &gt;= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_utility &gt;= 201811L</code> </td></tr></tbody></table></div>
1151       </td></tr><tr><td align="left">  <code class="code">constexpr <span class="emphasis"><em>INVOKE</em></span></code> </td><td align="left">
1152         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1065r2.html" target="_top">
1153         P1065R2 </a>
1154       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_functional &gt;= 201907L</code> </td></tr><tr><td align="left">  Transformation Trait <code class="code">remove_cvref</code> </td><td align="left">
1155         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0550r2.pdf" target="_top">
1156         P0550R2 </a>
1157       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_remove_cvref &gt;= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left">  Implicit conversion traits and utility functions </td><td align="left">
1158         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0758r1.html" target="_top">
1159         P0758R1 </a>
1160       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_is_nothrow_convertible &gt;= 201806L</code>  (since 9.4, see Note 1) </td></tr><tr><td align="left">  The <code class="code">identity</code> metafunction </td><td align="left">
1161         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0887r1.pdf" target="_top">
1162         P0887R1 </a>
1163       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_type_identity &gt;= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left">  <code class="code">unwrap_ref_decay</code> and <code class="code">unwrap_reference</code> </td><td align="left">
1164         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0318r1.pdf" target="_top">
1165         P0318R1 </a>
1166       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_unwrap_ref &gt;= 201811L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#B0B0B0"><td align="left">  Improving Completeness Requirements for Type Traits </td><td align="left">
1167         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1285r0.pdf" target="_top">
1168         P1285R0 </a>
1169       </td><td align="center"> Partial </td><td align="left"> </td></tr><tr><td align="left">  Missing feature test macros </td><td align="left">
1170         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1353r0.html" target="_top">
1171         P1353R0 </a>
1172       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Making std::underlying_type SFINAE-friendly </td><td align="left">
1173         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0340r3.html" target="_top">
1174         P0340R3 </a>
1175       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> Traits for [Un]bounded Arrays </td><td align="left">
1176         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1357r1.pdf" target="_top">
1177         P1357R1 </a>
1178       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bounded_array_traits &gt;= 201902L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Layout-compatibility and pointer-interconvertibility traits </td><td align="left">
1179         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0466r5.pdf" target="_top">
1180         P0466R5 </a>
1181       </td><td align="center"> </td><td align="left">
1182         <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_is_layout_compatible &gt;= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_is_pointer_interconvertible &gt;= 201907L</code> </td></tr></tbody></table></div>
1183       </td></tr><tr><td align="left">  Integrating feature-test macros into the C++ WD </td><td align="left">
1184         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0941r2.html" target="_top">
1185         P0941R2 </a>
1186       </td><td align="center"> 5.1 </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">&lt;version&gt;</code> </td><td align="left">
1187         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0754r2.pdf" target="_top">
1188         P0754R2 </a>
1189       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__has_include(&lt;version&gt;)</code> </td></tr><tr><td colspan="4" align="left">
1190         <span class="bold"><strong>Synchronization</strong></span>
1191       </td></tr><tr><td align="left">  Atomic Ref </td><td align="left">
1192         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0019r8.html" target="_top">
1193         P0019R8 </a>
1194       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_ref &gt;= 201806L</code> </td></tr><tr><td align="left">  Floating Point Atomic </td><td align="left">
1195         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0020r6.html" target="_top">
1196         P0020R6 </a>
1197       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_float &gt;= 201711L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  C++ Synchronized Buffered Ostream </td><td align="left">
1198         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0053r7.pdf" target="_top">
1199         P0053R7 </a>
1200       </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_syncbuf &gt;= 201711L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Manipulators for C++ Synchronized Buffered Ostream </td><td align="left">
1201         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0753r2.pdf" target="_top">
1202         P0753R2 </a>
1203       </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_syncbuf &gt;= 201803L</code> </td></tr><tr><td align="left">  Make <code class="code">std::memory_order</code> a scoped enumeration </td><td align="left">
1204         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0439r0.html" target="_top">
1205         P0439R0 </a>
1206       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  The Curious Case of Padding Bits, Featuring Atomic Compare-and-Exchange </td><td align="left">
1207         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0528r3.html" target="_top">
1208         P0528R3 </a>
1209       </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Atomic <code class="code">shared_ptr</code> </td><td align="left">
1210         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0718r2.html" target="_top">
1211         P0718R2 </a>
1212       </td><td align="center"> </td><td align="left"> <code class="code"> __cpp_lib_atomic_shared_ptr &gt;= 201711L</code> </td></tr><tr><td align="left"> std::stop_token and std::jthread </td><td align="left">
1213         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0660r10.pdf" target="_top">
1214         P0660R10 </a>
1215       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_jthread &gt;= 201907L</code> </td></tr><tr><td align="left"> Rename <code class="code">condition_variable_any</code> interruptible wait methods </td><td align="left">
1216         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1869r1.html" target="_top">
1217         P1869R1 </a>
1218       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_jthread &gt;= 201911L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Atomic waiting and notifying, std::semaphore, std::latch and std::barrier </td><td align="left">
1219         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1135r6.html" target="_top">
1220         P1135R6 </a>
1221       </td><td align="center"> </td><td align="left">
1222         <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_atomic_lock_free_type_aliases &gt;= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_atomic_flag_test &gt;= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_atomic_wait &gt;= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_semaphore &gt;= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_latch &gt;= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_barrier &gt;= 201907L</code> </td></tr></tbody></table></div>
1223       </td></tr><tr><td align="left"> Fixing Atomic Initialization </td><td align="left">
1224         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0883r2.pdf" target="_top">
1225         P0883R2 </a>
1226       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_value_initialization &gt;= 201911L</code> </td></tr><tr><td colspan="4" align="left">
1227         <span class="bold"><strong>Ranges and Concepts</strong></span>
1228       </td></tr><tr><td align="left">  Standard Library Concepts </td><td align="left">
1229         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0898r3.pdf" target="_top">
1230         P0898R3 </a>
1231       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts &gt;= 201806L</code> </td></tr><tr><td align="left">  Rename concepts to standard_case for C++20, while we still can </td><td align="left">
1232         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1754r1.pdf" target="_top">
1233         P1754R1 </a>
1234       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts &gt;= 201907L</code> </td></tr><tr><td align="left">  Wording for <span class="emphasis"><em><code class="code">boolean-testable</code></em></span> </td><td align="left">
1235         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1964r2.html" target="_top">
1236         P1964R2 </a>
1237       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts &gt;= 202002L</code> </td></tr><tr><td align="left">  The One Ranges Proposal </td><td align="left">
1238         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf" target="_top">
1239         P0896R4 </a>
1240       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges &gt;= 201811L</code> </td></tr><tr><td align="left">  Input Range Adaptors </td><td align="left">
1241         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1035r7.pdf" target="_top">
1242         P1035R7 </a>
1243       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges &gt;= 201907L</code> </td></tr><tr><td align="left">  <code class="code">ranges</code> compare algorithm are over-constrained </td><td align="left">
1244         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1716r3.html" target="_top">
1245         P1716R3 </a>
1246       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges &gt;= 201911L</code> </td></tr><tr><td align="left">  Remove CommonReference requirement from StrictWeakOrdering (a.k.a Fixing Relations) </td><td align="left">
1247         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1248r1.html" target="_top">
1248         P1248R1 </a>
1249       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Ranges Design Cleanup </td><td align="left">
1250         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1252r2.pdf" target="_top">
1251         P1252R2 </a>
1252       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td colspan="4" align="left">
1253         <span class="bold"><strong>Time, dates, calendars, time zones</strong></span>
1254       </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Extending chrono to Calendars and Time Zones </td><td align="left">
1255         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r7.html" target="_top">
1256         P0355R7 </a>
1257       </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_chrono &gt;= 201803L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Miscellaneous minor fixes for chrono </td><td align="left">
1258         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1466r3.html" target="_top">
1259         P1466R3 </a>
1260       </td><td align="left"> </td><td align="left"> <code class="code">__cpp_lib_chrono &gt;= 201907L</code> </td></tr><tr><td align="left">  <code class="code">&lt;chrono&gt;</code> <code class="code">zero()</code>, <code class="code">min()</code>, and <code class="code">max()</code> should be <code class="code">noexcept</code> </td><td align="left">
1261         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0972r0.pdf" target="_top">
1262         P0972R0 </a>
1263       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td colspan="4" align="left">
1264         <span class="bold"><strong>Three-way comparison</strong></span>
1265       </td></tr><tr><td align="left">  Library Support for the Spaceship (Comparison) Operator </td><td align="left">
1266         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0768r1.pdf" target="_top">
1267         P0768R1 </a>
1268       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_three_way_comparison &gt;= 201711L</code> </td></tr><tr><td align="left">  Symmetry for spaceship </td><td align="left">
1269         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0905r1.html" target="_top">
1270         P0905R1 </a>
1271       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Adding &lt;=&gt; to the standard library </td><td align="left">
1272         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1614r2.html" target="_top">
1273         P1614R2 </a>
1274       </td><td align="center"> 10.1 </td><td align="left">
1275         <code class="code">__cpp_lib_three_way_comparison &gt;= 201907L</code>
1276       </td></tr><tr><td colspan="4" align="left">
1277         <span class="bold"><strong>Strings and text</strong></span>
1278       </td></tr><tr bgcolor="#C8B0B0"><td align="left">  <code class="code">string::reserve</code> Should Not Shrink </td><td align="left">
1279         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0966r1.html" target="_top">
1280         P0966R1 </a>
1281       </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">char8_t</code>: A type for UTF-8 characters and strings </td><td align="left">
1282         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0482r6.html" target="_top">
1283         P0482R6 </a>
1284       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_char8_t &gt;= 201811L</code> </td></tr><tr><td align="left">  <code class="code">char8_t</code> backward compatibility remediation </td><td align="left">
1285         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r3.html" target="_top">
1286         P1423R3 </a>
1287       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_char8_t &gt;= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Text formatting </td><td align="left">
1288         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0645r10.html" target="_top">
1289         P0645R10 </a>
1290       </td><td align="center"> </td><td align="left">
1291         <code class="code">__cpp_lib_format &gt;= 201907L</code>
1292       </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Integration of chrono with text formatting </td><td align="left">
1293         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1361r2.pdf" target="_top">
1294         P1361R2 </a>
1295       </td><td align="center"> </td><td align="left">
1296         <code class="code">__cpp_lib_format &gt;= 201907L</code>
1297       </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Printf corner cases in <code class="code">std::format</code> </td><td align="left">
1298         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1652r1.html" target="_top">
1299         P1652R1 </a>
1300       </td><td align="center"> </td><td align="left">
1301         <code class="code">__cpp_lib_format &gt;= 201907L</code>
1302       </td></tr><tr><td align="left">  String Prefix and Suffix Checking </td><td align="left">
1303         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0457r2.html" target="_top">
1304         P0457R2 </a>
1305       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_starts_ends_with &gt;= 201711L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Update The Reference To The Unicode Standard </td><td align="left">
1306         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1025r1.html" target="_top">
1307         P1025R1 </a>
1308       </td><td align="center"> </td><td align="left"> </td></tr><tr><td colspan="4" align="left">
1309         <span class="bold"><strong>Containers</strong></span>
1310       </td></tr><tr><td align="left"> span: bounds-safe views for sequences of objects </td><td align="left">
1311         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0122r7.pdf" target="_top">
1312         P0122R7 </a>
1313       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span &gt;= 201803L</code> </td></tr><tr><td align="left">
1314         Usability Enhancements for <code class="classname">std::span</code>
1315       </td><td align="left">
1316         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1024r3.pdf" target="_top">
1317         P1024R3 </a>
1318       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span &gt;= 201902L</code> </td></tr><tr><td align="left">  Should Span be Regular? </td><td align="left">
1319         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1085r2.md" target="_top">
1320         P1085R2 </a>
1321       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left"> Fixed-size <code class="code">&lt;span&gt;</code> construction from dynamic range </td><td align="left">
1322         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1976r2.html" target="_top">
1323         P1976R2 </a>
1324       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span &gt;= 202002L</code> </td></tr><tr><td align="left"> <code class="code">std::to_array</code> </td><td align="left">
1325         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0325r4.html" target="_top">
1326         P0325R4 </a>
1327       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_to_array &gt;= 201907L</code> </td></tr><tr><td align="left">  Checking for Existence of an Element in Associative Containers </td><td align="left">
1328         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0458r2.html" target="_top">
1329         P0458R2 </a>
1330       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Comparing Unordered Containers </td><td align="left">
1331         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0809r0.pdf" target="_top">
1332         P0809R0 </a>
1333       </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Heterogeneous lookup for unordered containers </td><td align="left">
1334         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0919r3.html" target="_top">
1335         P0919R3 </a>
1336       </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_generic_unordered_lookup &gt;= 201811</code> </td></tr><tr><td align="left">  Adopt Consistent Container Erasure from Library Fundamentals 2 for C++20 </td><td align="left">
1337         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1209r0.html" target="_top">
1338         P1209R0 </a>
1339       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_erase_if &gt;= 201811L</code> </td></tr><tr><td align="left">  Improving the Return Value of Erase-Like Algorithms </td><td align="left">
1340         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0646r1.pdf" target="_top">
1341         P0646R1 </a>
1342       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_list_remove_return_type &gt;= 201806L</code> </td></tr><tr><td align="left">  Improving the Return Value of Erase-Like Algorithms II: Free <code class="code">erase</code>/<code class="code">erase_if</code> </td><td align="left">
1343         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1115r3.pdf" target="_top">
1344         P1115R3 </a>
1345       </td><td align="center"> 9.1 </td><td align="left">
1346         <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_erase_if &gt;= 202002L</code> </td></tr><tr><td> (defined to <code class="code">201900L</code> for GCC 9.1 and 9.2 so use <code class="code">&gt; 201811L</code>) </td></tr></tbody></table></div>
1347       </td></tr><tr><td align="left"> Signed ssize() functions, unsigned size() functions </td><td align="left">
1348         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1227r2.html" target="_top">
1349         P1227R2 </a>
1350       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ssize &gt;= 201902L</code> </td></tr><tr><td colspan="4" align="left">
1351         <span class="bold"><strong>Memory management</strong></span>
1352       </td></tr><tr><td align="left">  Utility to convert a pointer to a raw pointer </td><td align="left">
1353         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0653r2.html" target="_top">
1354         P0653R2 </a>
1355       </td><td align="center"> 8.1 </td><td align="left"> <code class="code">__cpp_lib_to_address &gt;= 201711L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Extending <code class="code">make_shared</code> to Support Arrays </td><td align="left">
1356         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0674r1.html" target="_top">
1357         P0674R1 </a>
1358       </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_shared_ptr_arrays &gt;= 201707L</code> </td></tr><tr><td align="left">  Efficient sized delete for variable sized classes </td><td align="left">
1359         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0722r3.html" target="_top">
1360         P0722R3 </a>
1361       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_destroying_delete &gt;= 201806L</code> </td></tr><tr><td align="left">  Utility functions to implement uses-allocator construction </td><td align="left">
1362         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0591r4.pdf" target="_top">
1363         P0591R4 </a>
1364       </td><td align="center"> 9.1 </td><td align="left">
1365         <code class="code">std::scoped_allocator_adaptor</code> changes missing in 9.1.0
1366       </td></tr><tr><td align="left">  <code class="code">std::assume_aligned</code> </td><td align="left">
1367         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1007r3.pdf" target="_top">
1368         P1007R3 </a>
1369       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_assume_aligned &gt;= 201811L</code> (since 9.4, see Note 1) </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Smart pointer creation with default initialization </td><td align="left">
1370         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1020r1.html" target="_top">
1371         P1020R1 </a>
1372       </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_smart_ptr_for_overwrite &gt;= 201811L</code> </td></tr><tr><td align="left">  Make stateful allocator propagation more consistent for <code class="code">operator+(basic_string)</code> </td><td align="left">
1373         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1165r1.html" target="_top">
1374         P1165R1 </a>
1375       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left">
1376         <code class="classname">polymorphic_allocator&lt;&gt;</code> as a vocabulary type
1377       </td><td align="left">
1378         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0339r6.pdf" target="_top">
1379         P0339R6 </a>
1380       </td><td align="center"> 9.1 </td><td align="left">
1381       <code class="code">__cpp_lib_polymorphic_allocator &gt;= 201902L</code> (since 9.4, see Note 1)
1382       </td></tr><tr><td align="left">  LWG 2511: guaranteed copy elision for piecewise construction </td><td align="left">
1383         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0475r1.html" target="_top">
1384         P0475R1 </a>
1385       </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td colspan="4" align="left">
1386         <span class="bold"><strong>Miscellaneous</strong></span>
1387       </td></tr><tr><td align="left">  <code class="code">nodiscard</code> in the Library </td><td align="left">
1388         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0600r1.pdf" target="_top">
1389         P0600R1 </a>
1390       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left">  de-pessimize legacy algorithms with <code class="code">std::move</code> </td><td align="left">
1391         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0616r0.pdf" target="_top">
1392         P0616R0 </a>
1393       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left">  Deprecate POD </td><td align="left">
1394         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0767r1.html" target="_top">
1395         P0767R1 </a>
1396       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left">  Treating Unnecessary <code class="code">decay</code> </td><td align="left">
1397         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0777r1.pdf" target="_top">
1398         P0777R1 </a>
1399       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Thou Shalt Not Specialize std Function Templates! </td><td align="left">
1400         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0551r3.pdf" target="_top">
1401         P0551R3 </a>
1402       </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Bit-casting object representations </td><td align="left">
1403         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0476r2.html" target="_top">
1404         P0476R2 </a>
1405       </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_bit_cast &gt;= 201806L</code> </td></tr><tr><td align="left">  Integral power-of-2 operations </td><td align="left">
1406         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0556r3.html" target="_top">
1407         P0556R3 </a>
1408       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_int_pow2 &gt;= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> On the names of low-level bit manipulation functions </td><td align="left">
1409         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1956r1.pdf" target="_top">
1410         P1956R1 </a>
1411       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_int_pow2 &gt;= 202002L</code> </td></tr><tr><td align="left"> Safe integral comparisons </td><td align="left">
1412         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p0586r2.html" target="_top">
1413         P0586R2 </a>
1414       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_integer_comparison_functions &gt;= 202002L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Reviewing Deprecated Facilities of C++17 for C++20 </td><td align="left">
1415         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0619r4.html" target="_top">
1416         P0619R4 </a>
1417       </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">fpos</code> Requirements </td><td align="left">
1418         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0759r1.html" target="_top">
1419         P0759R1 </a>
1420       </td><td align="center"> — </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Add <code class="code">shift</code> to <code class="code">&lt;algorithm&gt;</code> </td><td align="left">
1421         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0769r2.pdf" target="_top">
1422         P0769R2 </a>
1423       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_shift &gt;= 201806L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Standard Library Specification in a Concepts and Contracts World </td><td align="left">
1424         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0788r3.pdf" target="_top">
1425         P0788R3 </a>
1426       </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">explicit(bool)</code> </td><td align="left">
1427         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0892r2.html" target="_top">
1428         P0892R2 </a>
1429       </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left">  Eradicating unnecessarily explicit default constructors from the standard library </td><td align="left">
1430         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0935r0.html" target="_top">
1431         P0935R0 </a>
1432       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">std::function</code> move constructor should be <code class="code">noexcept</code> </td><td align="left">
1433         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0771r1.pdf" target="_top">
1434         P0771R1 </a>
1435       </td><td align="center"> 7.2 </td><td align="left"> </td></tr><tr><td align="left">  Simplified partial function application </td><td align="left">
1436         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0356r5.html" target="_top">
1437         P0356R5 </a>
1438       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bind_front &gt;= 201811L</code> </td></tr><tr><td align="left">  <code class="code">bind_front</code> should not unwrap <code class="code">reference_wrapper</code> </td><td align="left">
1439         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1651r0.html" target="_top">
1440         P1651R0 </a>
1441       </td><td align="center"> 9.3 </td><td align="left"> <code class="code">__cpp_lib_bind_front &gt;= 201907L</code> </td></tr><tr><td align="left">  <code class="code">reference_wrapper</code> for incomplete types </td><td align="left">
1442         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0357r3.html" target="_top">
1443         P0357R3 </a>
1444       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Fixing <code class="code">operator&gt;&gt;(basic_istream&amp;, CharT*)</code> (LWG 2499) </td><td align="left">
1445         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0487r1.html" target="_top">
1446         P0487R1 </a>
1447       </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">variant</code> and <code class="code">optional</code> should propagate copy/move triviality </td><td align="left">
1448         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0602r4.html" target="_top">
1449         P0602R4 </a>
1450       </td><td align="center"> 8.3 </td><td align="left"> </td></tr><tr><td align="left">  A sane <code class="code">variant</code> converting constructor </td><td align="left">
1451         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r3.html" target="_top">
1452         P0608R3 </a>
1453       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left">  <code class="code">visit&lt;R&gt;</code>: Explicit Return Type for <code class="code">visit</code> </td><td align="left">
1454         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0655r1.pdf" target="_top">
1455         P0655R1 </a>
1456       </td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left">  P0899R1 - LWG 3016 is not a defect </td><td align="left">
1457         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0899r1.html" target="_top">
1458         P0899R1 </a>
1459       </td><td align="center"> 7.1 </td><td align="left"> </td></tr><tr><td align="left">  Editorial Guidance for merging P0019r8 and P0528r3 </td><td align="left">
1460         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1123r0.html" target="_top">
1461         P1123R0 </a>
1462       </td><td align="center"> — </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Cleaning up Clause 20 </td><td align="left">
1463         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1148r0.pdf" target="_top">
1464         P1148R0 </a>
1465       </td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">  Completing the Rebase of Library Fundamentals, Version 3, Working Draft </td><td align="left">
1466         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1210r0.html" target="_top">
1467         P1210R0 </a>
1468       </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left">  Alternative Wording for P0907R4 Signed Integers are Two's Complement </td><td align="left">
1469         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1236r1.html" target="_top">
1470         P1236R1 </a>
1471       </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left">
1472         I Stream, You Stream, We All Stream for
1473         <code class="classname">istream_iterator</code>
1474       </td><td align="left">
1475         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0738r2.html" target="_top">
1476         P0738R2 </a>
1477       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr><td align="left">
1478         Mandating the Standard Library:
1479         Clause 16 - Language support library
1480       </td><td align="left">
1481         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1458r1.pdf" target="_top">
1482         P1458R1 </a>
1483       </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left">
1484         Mandating the Standard Library:
1485         Clause 18 - Diagnostics library
1486       </td><td align="left">
1487         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1458r1.pdf" target="_top">
1488         P1459R1 </a>
1489       </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left">
1490         Mandating the Standard Library:
1491         Clause 20 - Strings library
1492       </td><td align="left">
1493         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1462r1.html" target="_top">
1494         P1462R1 </a>
1495       </td><td align="center"> — </td><td align="left"> </td></tr><tr><td align="left">
1496         Mandating the Standard Library:
1497         Clause 21 - Containers library
1498       </td><td align="left">
1499         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1463r1.pdf" target="_top">
1500         P1463R1 </a>
1501       </td><td align="center"> 10.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">
1502         Mandating the Standard Library:
1503         Clause 22 - Iterators library
1504       </td><td align="left">
1505         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1464r1.pdf" target="_top">
1506         P1464R1 </a>
1507       </td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> Make <code class="code">create_directory()</code> Intuitive </td><td align="left">
1508         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1164r1.pdf" target="_top">
1509         P1164R1
1510   </a>
1511       </td><td align="center"> 8.3 </td><td align="left"> Treated as a DR for C++17 </td></tr><tr><td align="left">
1512         Target Vectorization Policies from Parallelism V2 TS to C++20
1513       </td><td align="left">
1514         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1001r2.html" target="_top">
1515         P1001R2 </a>
1516       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_execution &gt;= 201902L</code> (since 9.4, see Note 1)</td></tr><tr><td align="left"> Merge Coroutines TS into C++20 working draft </td><td align="left">
1517         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0912r5.html" target="_top">
1518         P0912R5 </a>
1519       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_coroutines &gt;= 201902L</code> </td></tr><tr><td align="left">  Endian just Endian </td><td align="left">
1520         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0463r1.html" target="_top">
1521         P0463R1 </a>
1522       </td><td align="center"> 8.1 </td><td align="left"> <code class="code">__cpp_lib_endian &gt;= 201907L</code> </td></tr><tr><td align="left"> Bit operations </td><td align="left">
1523         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0553r4.html" target="_top">
1524         P0553R4 </a>
1525       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_bitops &gt;= 201907L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left">  Well-behaved interpolation for numbers and pointers </td><td align="left">
1526         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0811r3.html" target="_top">
1527         P0811R3 </a>
1528       </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_interpolate &gt;= 201902L</code> </td></tr><tr><td align="left"> Mathematical constants </td><td align="left">
1529         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0631r8.pdf" target="_top">
1530         P0631R8 </a>
1531       </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_math_constants &gt;= 201907L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> std::source_location </td><td align="left">
1532         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1208r6.pdf" target="_top">
1533         P1208R6 </a>
1534       </td><td align="center"> </td><td align="left">
1535         <code class="code">__cpp_lib_source_location &gt;= 201907L</code>
1536       </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Efficient access to std::basic_stringbuf's Buffer </td><td align="left">
1537         <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0408r7.pdf" target="_top">
1538         P0408R7 </a>
1539       </td><td align="center"> </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><p>
1540 Note 1: This feature is supported in older releases but the
1541 <code class="code">__cpp_lib</code> macro is not defined to the right value
1542 (or not defined at all) until the version shown in parentheses.
1543 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr1"></a>C++ TR1</h3></div></div></div><p>
1544 This table is based on the table of contents of ISO/IEC DTR 19768
1545 Doc No: N1836=05-0096 Date: 2005-06-24
1546 Draft Technical Report on C++ Library Extensions
1547 </p><p>
1548 In this implementation the header names are prefixed by
1549 <code class="code">tr1/</code>, for instance <code class="code">&lt;tr1/functional&gt;</code>,
1550 <code class="code">&lt;tr1/memory&gt;</code>, and so on.
1551 </p><p>
1552 This page describes the TR1 support in mainline GCC, not in any particular
1553 release.
1554 </p><div class="table"><a id="table.tr1_status"></a><p class="title"><strong>Table 1.9. C++ TR1 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ TR1 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"><span class="emphasis"><em>2</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>General Utilities</em></span></td></tr><tr><td align="left">2.1</td><td align="left">Reference wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.1.1</td><td align="left">Additions to header <code class="code">&lt;functional&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.1.2.1</td><td align="left"><code class="code">reference_wrapper</code> construct/copy/destroy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.2</td><td align="left"><code class="code">reference_wrapper</code> assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.3</td><td align="left"><code class="code">reference_wrapper</code> access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.4</td><td align="left"><code class="code">reference_wrapper</code> invocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.1.2.5</td><td align="left"><code class="code">reference_wrapper</code> helper functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2</td><td align="left">Smart pointers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.2.1</td><td align="left">Additions to header <code class="code">&lt;memory&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.2</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left"> </td><td align="left">
1555         <p>
1556           Uses code from
1557           <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>.
1558         </p>
1559       </td></tr><tr><td align="left">2.2.3.1</td><td align="left"><code class="code">shared_ptr</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.2</td><td align="left"><code class="code">shared_ptr</code> destructor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.3</td><td align="left"><code class="code">shared_ptr</code> assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.4</td><td align="left"><code class="code">shared_ptr</code> modifiers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.5</td><td align="left"><code class="code">shared_ptr</code> observers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.6</td><td align="left"><code class="code">shared_ptr</code> comparison</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.7</td><td align="left"><code class="code">shared_ptr</code> I/O</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.8</td><td align="left"><code class="code">shared_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.9</td><td align="left"><code class="code">shared_ptr</code> casts</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.3.10</td><td align="left"><code class="code">get_deleter</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">2.2.4.1</td><td align="left"><code class="code">weak_ptr</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.2</td><td align="left"><code class="code">weak_ptr</code> destructor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.3</td><td align="left"><code class="code">weak_ptr</code> assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.4</td><td align="left"><code class="code">weak_ptr</code> modifiers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.5</td><td align="left"><code class="code">weak_ptr</code> observers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.6</td><td align="left"><code class="code">weak_ptr</code> comparison</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.4.7</td><td align="left"><code class="code">weak_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">2.2.5</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>3</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Function Objects</em></span></td></tr><tr><td align="left">3.1</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2</td><td align="left">Additions to <code class="code">&lt;functional&gt; synopsis</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4</td><td align="left">Function return types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.5</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6</td><td align="left">Function object binders</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.6.1</td><td align="left">Class template <code class="code">is_bind_expression</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6.2</td><td align="left">Class template <code class="code">is_placeholder</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6.3</td><td align="left">Function template <code class="code">bind</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.6.4</td><td align="left">Placeholders</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7</td><td align="left">Polymorphic function wrappers</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.7.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.1.1</td><td align="left"><code class="code">bad_function_call</code> constructor</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2</td><td align="left">Class template <code class="code">function</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.7.2.1</td><td align="left"><code class="code">function</code> construct/copy/destroy</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.2</td><td align="left"><code class="code">function</code> modifiers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.3</td><td align="left"><code class="code">function</code> capacity</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.4</td><td align="left"><code class="code">function</code> invocation</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.5</td><td align="left"><code class="code">function</code> target access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.6</td><td align="left">undefined operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.7</td><td align="left">null pointer comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.7.2.8</td><td align="left">specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>4</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Metaprogramming and type traits</em></span></td></tr><tr><td align="left">4.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.2</td><td align="left">Header <code class="code">&lt;type_traits&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.4</td><td align="left">General Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.5</td><td align="left">Unary Type Traits</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">4.5.1</td><td align="left">Primary Type Categories</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.5.2</td><td align="left">Composite type traits</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.5.3</td><td align="left">Type properties</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7</td><td align="left">Transformations between types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">4.7.1</td><td align="left">Const-volatile modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7.2</td><td align="left">Reference modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7.3</td><td align="left">Array modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.7.4</td><td align="left">Pointer modifications</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.8</td><td align="left">Other transformations</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">4.9</td><td align="left">Implementation requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>5</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Numerical Facilities</em></span></td></tr><tr><td align="left">5.1</td><td align="left">Random number generation</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">5.1.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.2</td><td align="left">Header <code class="code">&lt;random&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.3</td><td align="left">Class template <code class="code">variate_generator</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4</td><td align="left">Random number engine class templates</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.1</td><td align="left">Class template <code class="code">linear_congruential</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.2</td><td align="left">Class template <code class="code">mersenne_twister</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.3</td><td align="left">Class template <code class="code">subtract_with_carry</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.4</td><td align="left">Class template <code class="code">subtract_with_carry_01</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.5</td><td align="left">Class template <code class="code">discard_block</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.4.6</td><td align="left">Class template <code class="code">xor_combine</code></td><td align="left">Y</td><td align="left">operator()() per N2079</td></tr><tr><td align="left">5.1.5</td><td align="left">Engines with predefined parameters</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.6</td><td align="left">Class <code class="code">random_device</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7</td><td align="left">Random distribution class templates</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.1</td><td align="left">Class template <code class="code">uniform_int</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.2</td><td align="left">Class <code class="code">bernoulli_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.3</td><td align="left">Class template <code class="code">geometric_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.4</td><td align="left">Class template <code class="code">poisson_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.5</td><td align="left">Class template <code class="code">binomial_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.6</td><td align="left">Class template <code class="code">uniform_real</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.7</td><td align="left">Class template <code class="code">exponential_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.8</td><td align="left">Class template <code class="code">normal_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.1.7.9</td><td align="left">Class template <code class="code">gamma_distribution</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1</td><td align="left">Additions to header <code class="code">&lt;cmath&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.1</td><td align="left">associated Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.2</td><td align="left">associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.3</td><td align="left">beta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.4</td><td align="left">(complete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.5</td><td align="left">(complete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.6</td><td align="left">(complete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.7</td><td align="left">confluent hypergeometric functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.8</td><td align="left">regular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.9</td><td align="left">cylindrical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.10</td><td align="left">irregular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.11</td><td align="left">cylindrical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.12</td><td align="left">(incomplete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.13</td><td align="left">(incomplete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.14</td><td align="left">(incomplete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.15</td><td align="left">exponential integral</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.16</td><td align="left">Hermite polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.17</td><td align="left">hypergeometric functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.18</td><td align="left">Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.19</td><td align="left">Legendre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.20</td><td align="left">Riemann zeta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.21</td><td align="left">spherical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.22</td><td align="left">spherical associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.1.23</td><td align="left">spherical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">5.2.2</td><td align="left">Additions to header <code class="code">&lt;math.h&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>6</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Containers</em></span></td></tr><tr><td align="left">6.1</td><td align="left">Tuple types</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.1</td><td align="left">Header <code class="code">&lt;tuple&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.2</td><td align="left">Additions to header <code class="code">&lt;utility&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3</td><td align="left">Class template <code class="code">tuple</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.1</td><td align="left">Construction</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.2</td><td align="left">Tuple creation functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.3</td><td align="left">Tuple helper classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.4</td><td align="left">Element access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.3.5</td><td align="left">Relational operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.1.4</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2</td><td align="left">Fixed size array</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.1</td><td align="left">Header <code class="code">&lt;array&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2</td><td align="left">Class template <code class="code">array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.1</td><td align="left"><code class="code">array</code> constructors, copy, and assignment</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.2</td><td align="left"><code class="code">array</code> specialized algorithms</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.3</td><td align="left"><code class="code">array</code> size</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.4</td><td align="left">Zero sized <code class="code">array</code>s</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.2.2.5</td><td align="left">Tuple interface to class template <code class="code">array</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.1</td><td align="left">Unordered associative container requirements</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.1.1</td><td align="left">Exception safety guarantees</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.2</td><td align="left">Additions to header <code class="code">&lt;functional&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.3</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4</td><td align="left">Unordered associative container classes</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.1</td><td align="left">Header <code class="code">&lt;unordered_set&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.2</td><td align="left">Header <code class="code">&lt;unordered_map&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.3</td><td align="left">Class template <code class="code">unordered_set</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.3.1</td><td align="left"><code class="code">unordered_set</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.3.2</td><td align="left"><code class="code">unordered_set</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4</td><td align="left">Class template <code class="code">unordered_map</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4.1</td><td align="left"><code class="code">unordered_map</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4.2</td><td align="left"><code class="code">unordered_map</code> element access</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.4.3</td><td align="left"><code class="code">unordered_map</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.5</td><td align="left">Class template <code class="code">unordered_multiset</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.5.1</td><td align="left"><code class="code">unordered_multiset</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.5.2</td><td align="left"><code class="code">unordered_multiset</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.6</td><td align="left">Class template <code class="code">unordered_multimap</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.6.1</td><td align="left"><code class="code">unordered_multimap</code> constructors</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">6.3.4.6.2</td><td align="left"><code class="code">unordered_multimap</code> swap</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>7</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Regular Expressions</em></span></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.1</td><td align="left">Definitions</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.2</td><td align="left">Requirements</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.3</td><td align="left">Regular expressions summary</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.4</td><td align="left">Header <code class="code">&lt;regex&gt;</code> synopsis</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5</td><td align="left">Namespace <code class="code">tr1::regex_constants</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.1</td><td align="left">Bitmask Type <code class="code">syntax_option_type</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.2</td><td align="left">Bitmask Type <code class="code">regex_constants::match_flag_type</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.3</td><td align="left">Implementation defined <code class="code">error_type</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.1</td><td align="left"><code class="code">basic_regex</code> constants</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.2</td><td align="left"><code class="code">basic_regex</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.3</td><td align="left"><code class="code">basic_regex</code> assign</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.4</td><td align="left"><code class="code">basic_regex</code> constant operations</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.5</td><td align="left"><code class="code">basic_regex</code> locale</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.6</td><td align="left"><code class="code">basic_regex</code> swap</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.7</td><td align="left"><code class="code">basic_regex</code> non-member functions</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.7.1</td><td align="left"><code class="code">basic_regex</code> non-member swap</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9.1</td><td align="left"><code class="code">sub_match</code> members</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9.2</td><td align="left"><code class="code">sub_match</code> non-member operators</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.1</td><td align="left"><code class="code">match_results</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.2</td><td align="left"><code class="code">match_results</code> size</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.3</td><td align="left"><code class="code">match_results</code> element access</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.4</td><td align="left"><code class="code">match_results</code> formatting</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.5</td><td align="left"><code class="code">match_results</code> allocator</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.6</td><td align="left"><code class="code">match_results</code> swap</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11</td><td align="left">Regular expression algorithms</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.1</td><td align="left">exceptions</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.2</td><td align="left"><code class="code">regex_match</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.3</td><td align="left"><code class="code">regex_search</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.4</td><td align="left"><code class="code">regex_replace</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12</td><td align="left">Regular expression Iterators</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1</td><td align="left">Class template <code class="code">regex_iterator</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.1</td><td align="left"><code class="code">regex_iterator</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.2</td><td align="left"><code class="code">regex_iterator</code> comparisons</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.3</td><td align="left"><code class="code">regex_iterator</code> dereference</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.4</td><td align="left"><code class="code">regex_iterator</code> increment</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2</td><td align="left">Class template <code class="code">regex_token_iterator</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.1</td><td align="left"><code class="code">regex_token_iterator</code> constructors</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.2</td><td align="left"><code class="code">regex_token_iterator</code> comparisons</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.3</td><td align="left"><code class="code">regex_token_iterator</code> dereference</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.4</td><td align="left"><code class="code">regex_token_iterator</code> increment</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">7.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left"><span class="emphasis"><em>8</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>C Compatibility</em></span></td></tr><tr><td align="left">8.1</td><td align="left">Additions to header <code class="code">&lt;complex&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.2</td><td align="left">Function <code class="code">acos</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.3</td><td align="left">Function <code class="code">asin</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.4</td><td align="left">Function <code class="code">atan</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.5</td><td align="left">Function <code class="code">acosh</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.6</td><td align="left">Function <code class="code">asinh</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.7</td><td align="left">Function <code class="code">atanh</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.8</td><td align="left">Function <code class="code">fabs</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.9</td><td align="left">Additional Overloads</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.2</td><td align="left">Header <code class="code">&lt;ccomplex&gt;</code></td><td align="left">N</td><td align="left">DR 551</td></tr><tr bgcolor="#C8B0B0"><td align="left">8.3</td><td align="left">Header <code class="code">&lt;complex.h&gt;</code></td><td align="left">N</td><td align="left">DR 551</td></tr><tr><td align="left">8.4</td><td align="left">Additions to header <code class="code">&lt;cctype&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.4.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.4.2</td><td align="left">Function <code class="code">isblank</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.5</td><td align="left">Additions to header <code class="code">&lt;ctype.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.6</td><td align="left">Header <code class="code">&lt;cfenv&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.6.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.6.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.7</td><td align="left">Header <code class="code">&lt;fenv.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.8</td><td align="left">Additions to header <code class="code">&lt;cfloat&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.9</td><td align="left">Additions to header <code class="code">&lt;float.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10</td><td align="left">Additions to header <code class="code">&lt;ios&gt;</code></td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10.1</td><td align="left">Synopsis</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10.2</td><td align="left">Function <code class="code">hexfloat</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">8.11</td><td align="left">Header <code class="code">&lt;cinttypes&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.11.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left">DR 557</td></tr><tr><td align="left">8.11.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.12</td><td align="left">Header <code class="code">&lt;inttypes.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.13</td><td align="left">Additions to header <code class="code">&lt;climits&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.14</td><td align="left">Additions to header <code class="code">&lt;limits.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">8.15</td><td align="left">Additions to header <code class="code">&lt;locale&gt;</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">8.16</td><td align="left">Additions to header <code class="code">&lt;cmath&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.3</td><td align="left">Function template definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.16.4</td><td align="left">Additional overloads</td><td align="left">Y</td><td align="left">DR 568; DR 550</td></tr><tr><td align="left">8.17</td><td align="left">Additions to header <code class="code">&lt;math.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.18</td><td align="left">Additions to header <code class="code">&lt;cstdarg&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.19</td><td align="left">Additions to header <code class="code">&lt;stdarg.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.20</td><td align="left">The header <code class="code">&lt;cstdbool&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.21</td><td align="left">The header <code class="code">&lt;stdbool.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.22</td><td align="left">The header <code class="code">&lt;cstdint&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.22.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.22.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.23</td><td align="left">The header <code class="code">&lt;stdint.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24</td><td align="left">Additions to header <code class="code">&lt;cstdio&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.24.3</td><td align="left">Additional format specifiers</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.24.4</td><td align="left">Additions to header <code class="code">&lt;stdio.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25</td><td align="left">Additions to header <code class="code">&lt;cstdlib&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.3</td><td align="left">Function <code class="code">abs</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.25.4</td><td align="left">Function <code class="code">div</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.26</td><td align="left">Additions to header <code class="code">&lt;stdlib.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.27</td><td align="left">Header <code class="code">&lt;ctgmath&gt;</code></td><td align="left">Y</td><td align="left">DR 551</td></tr><tr><td align="left">8.28</td><td align="left">Header <code class="code">&lt;tgmath.h&gt;</code></td><td align="left">Y</td><td align="left">DR 551</td></tr><tr><td align="left">8.29</td><td align="left">Additions to header <code class="code">&lt;ctime&gt;</code></td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.30</td><td align="left">Additions to header <code class="code">&lt;cwchar&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.30.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.30.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.30.3</td><td align="left">Additional wide format specifiers</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.31</td><td align="left">Additions to header <code class="code">&lt;wchar.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.32</td><td align="left">Additions to header <code class="code">&lt;cwctype&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.32.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.32.2</td><td align="left">Function <code class="code">iswblank</code></td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.33</td><td align="left">Additions to header <code class="code">&lt;wctype.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.tr1.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is specified by the 1998 and 2003 standards,
1560       see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation
1561       Specific Behavior</a>. This section documents behaviour which
1562       is required by TR1.
1563    </p><p>
1564      <span class="emphasis"><em>3.6.4 [tr.func.bind.place]/1</em></span> There are 29
1565      placeholders defined and the placeholder types are
1566      <code class="literal">Assignable</code>.
1567    </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr24733"></a>C++ TR 24733</h3></div></div></div><p>
1568 This table is based on the table of contents of
1569 ISO/IEC TR 24733 Date: 2009-08-28
1570 Extension for the programming language C++ to support
1571 decimal floating-point arithmetic
1572 </p><p>
1573 This page describes the TR 24733 support in mainline GCC, not in any
1574 particular release.
1575 </p><div class="table"><a id="table.decfp_status"></a><p class="title"><strong>Table 1.10. C++ TR 24733 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ TR 24733 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left">
1576         <span class="emphasis"><em>0</em></span>
1577       </td><td colspan="3" align="left">
1578         <span class="emphasis"><em>Introduction</em></span>
1579       </td></tr><tr><td align="left">
1580         <span class="emphasis"><em>1</em></span>
1581       </td><td colspan="3" align="left">
1582         <span class="emphasis"><em>Normative references</em></span>
1583       </td></tr><tr><td align="left">
1584         <span class="emphasis"><em>2</em></span>
1585       </td><td colspan="3" align="left">
1586         <span class="emphasis"><em>Conventions</em></span>
1587       </td></tr><tr><td align="left">
1588         <span class="emphasis"><em>3</em></span>
1589       </td><td colspan="3" align="left">
1590         <span class="emphasis"><em>Decimal floating-point types</em></span>
1591       </td></tr><tr><td align="left">3.1</td><td align="left">Characteristics of decimal floating-point types</td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.2</td><td align="left">Decimal Types</td><td align="left"> </td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.1</td><td align="left">Class <code class="code">decimal</code> synopsis</td><td align="left">Partial</td><td align="left">Missing declarations for formatted input/output; non-conforming extension for functions converting to integral type</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.2</td><td align="left">Class <code class="code">decimal32</code></td><td align="left">Partial</td><td align="left">Missing 3.2.2.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.3</td><td align="left">Class <code class="code">decimal64</code></td><td align="left">Partial</td><td align="left">Missing 3.2.3.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.4</td><td align="left">Class <code class="code">decimal128</code></td><td align="left">Partial</td><td align="left">Missing 3.2.4.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr><td align="left">3.2.5</td><td align="left">Initialization from coefficient and exponent</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.6</td><td align="left">Conversion to generic floating-point type</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.7</td><td align="left">Unary arithmetic operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.8</td><td align="left">Binary arithmetic operators</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.2.9</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.2.10</td><td align="left">Formatted input</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.2.11</td><td align="left">Formatted output</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.3</td><td align="left">Additions to header <code class="code">limits</code></td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">3.4</td><td align="left">Headers <code class="code">cfloat</code> and <code class="code">float.h</code></td><td align="left"> </td><td align="left"> </td></tr><tr><td align="left">3.4.2</td><td align="left">Additions to header <code class="code">cfloat</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">3.4.3</td><td align="left">Additions to header <code class="code">float.h</code> synopsis</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">3.4.4</td><td align="left">Maximum finite value</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.5</td><td align="left">Epsilon</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.6</td><td align="left">Minimum positive normal value</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.7</td><td align="left">Minimum positive subnormal value</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">3.4.8</td><td align="left">Evaluation format</td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.5</td><td align="left">Additions to <code class="code">cfenv</code> and <code class="code">fenv.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.6</td><td align="left">Additions to <code class="code">cmath</code> and <code class="code">math.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.7</td><td align="left">Additions to <code class="code">cstdio</code> and <code class="code">stdio.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.8</td><td align="left">Additions to <code class="code">cstdlib</code> and <code class="code">stdlib.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.9</td><td align="left">Additions to <code class="code">cwchar</code> and <code class="code">wchar.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.10</td><td align="left">Facets</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.11</td><td align="left">Type traits</td><td align="left">N</td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">3.12</td><td align="left">Hash functions</td><td align="left">N</td><td align="left"> </td></tr><tr><td align="left">
1592         <span class="emphasis"><em>4</em></span>
1593       </td><td colspan="3" align="left">
1594         <span class="emphasis"><em>Notes on C compatibility</em></span>
1595       </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.specfun"></a>C++ IS 29124</h3></div></div></div><p>
1596 This table is based on the table of contents of ISO/IEC FDIS 29124
1597 Doc No: N3060 Date: 2010-03-06
1598 Extensions to the C++ Library to support mathematical special functions
1599 </p><p>
1600 Complete support for IS 29124 is in GCC 6.1 and later releases, when using
1601 at least C++11 (for older releases or C++98/C++03 use TR1 instead).
1602 For C++11 and C++14 the additions to the library are not declared by their
1603 respective headers unless <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code>
1604 is defined as a macro that expands to a non-zero integer constant.
1605 For C++17 the special functions are always declared (since GCC 7.1).
1606 </p><p>
1607 When the special functions are declared the macro
1608 <code class="code">__STDCPP_MATH_SPEC_FUNCS__</code> is defined to <code class="code">201003L</code>.
1609 </p><p>
1610 In addition to the special functions defined in IS 29124, for
1611 non-strict modes (i.e. <code class="code">-std=gnu++NN</code> modes) the
1612 hypergeometric functions and confluent hypergeometric functions
1613 from TR1 are also provided, defined in namespace
1614 <code class="code">__gnu_cxx</code>.
1615 </p><div class="table"><a id="table.specfun_status"></a><p class="title"><strong>Table 1.11. C++ Special Functions Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Special Functions Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr bgcolor="#B0B0B0"><td align="left">7</td><td align="left">Macro names</td><td align="left">Partial</td><td align="left">No diagnostic for inconsistent definitions of
1616              <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code></td></tr><tr><td align="left">8</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1</td><td align="left">Additions to header <code class="code">&lt;cmath&gt;</code> synopsis</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.1</td><td align="left">associated Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.2</td><td align="left">associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.3</td><td align="left">beta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.4</td><td align="left">(complete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.5</td><td align="left">(complete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.6</td><td align="left">(complete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.7</td><td align="left">regular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.8</td><td align="left">cylindrical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.9</td><td align="left">irregular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.10</td><td align="left">cylindrical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.11</td><td align="left">(incomplete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.12</td><td align="left">(incomplete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.13</td><td align="left">(incomplete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.14</td><td align="left">exponential integral</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.15</td><td align="left">Hermite polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.16</td><td align="left">Laguerre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.17</td><td align="left">Legendre polynomials</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.18</td><td align="left">Riemann zeta function</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.19</td><td align="left">spherical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.20</td><td align="left">spherical associated Legendre functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.1.21</td><td align="left">spherical Neumann functions</td><td align="left">Y</td><td align="left"> </td></tr><tr><td align="left">8.2</td><td align="left">Additions to header <code class="code">&lt;math.h&gt;</code></td><td align="left">Y</td><td align="left"> </td></tr><tr bgcolor="#B0B0B0"><td align="left">8.3</td><td align="left">The header <code class="code">&lt;ctgmath&gt;</code></td><td align="left">Partial</td><td align="left">Conflicts with C++ 2011 requirements.</td></tr><tr bgcolor="#C8B0B0"><td align="left">8.4</td><td align="left">The header <code class="code">&lt;tgmath.h&gt;</code></td><td align="left">N</td><td align="left">Conflicts with C++ 2011 requirements.</td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.specfun.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is specified by the 2011 standard,
1617       see <a class="link" href="status.html#iso.2011.specific" title="Implementation Specific Behavior">C++ 2011 Implementation
1618       Specific Behavior</a>. This section documents behaviour which
1619       is required by IS 29124.
1620    </p><p>
1621      <span class="emphasis"><em>7.2 [macro.user]/3 /4</em></span> The functions declared in
1622      Clause 8 are only declared when
1623      <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__ == 1</code>
1624      (or in C++17 mode, for GCC 7.1 and later).
1625    </p><p>
1626      <span class="emphasis"><em>8.1.1 [sf.cmath.Lnm]/1</em></span> The effect of calling
1627      these functions with <code class="code">n &gt;= 128</code> or <code class="code">m &gt;= 128</code>
1628      should be described here.
1629    </p><p>
1630      <span class="emphasis"><em>8.1.2 [sf.cmath.Plm]/3</em></span> The effect of calling
1631      these functions with <code class="code">l &gt;= 128</code> should be described here.
1632    </p><p>
1633      <span class="emphasis"><em>8.1.3 [sf.cmath.I]/3</em></span> The effect of calling
1634      these functions with <code class="code">nu &gt;= 128</code> should be described here.
1635    </p><p>
1636      <span class="emphasis"><em>8.1.8 [sf.cmath.J]/3</em></span> The effect of calling
1637      these functions with <code class="code">nu &gt;= 128</code> should be described here.
1638    </p><p>
1639      <span class="emphasis"><em>8.1.9 [sf.cmath.K]/3</em></span> The effect of calling
1640      these functions with <code class="code">nu &gt;= 128</code> should be described here.
1641    </p><p>
1642      <span class="emphasis"><em>8.1.10 [sf.cmath.N]/3</em></span> The effect of calling
1643      these functions with <code class="code">nu &gt;= 128</code> should be described here.
1644    </p><p>
1645      <span class="emphasis"><em>8.1.15 [sf.cmath.Hn]/3</em></span> The effect of calling
1646      these functions with <code class="code">n &gt;= 128</code> should be described here.
1647    </p><p>
1648      <span class="emphasis"><em>8.1.16 [sf.cmath.Ln]/3</em></span> The effect of calling
1649      these functions with <code class="code">n &gt;= 128</code> should be described here.
1650    </p><p>
1651      <span class="emphasis"><em>8.1.17 [sf.cmath.Pl]/3</em></span> The effect of calling
1652      these functions with <code class="code">l &gt;= 128</code> should be described here.
1653    </p><p>
1654      <span class="emphasis"><em>8.1.19 [sf.cmath.j]/3</em></span> The effect of calling
1655      these functions with <code class="code">n &gt;= 128</code> should be described here.
1656    </p><p>
1657      <span class="emphasis"><em>8.1.20 [sf.cmath.Ylm]/3</em></span> The effect of calling
1658      these functions with <code class="code">l &gt;= 128</code> should be described here.
1659    </p><p>
1660      <span class="emphasis"><em>8.1.21 [sf.cmath.n]/3</em></span> The effect of calling
1661      these functions with <code class="code">n &gt;= 128</code> should be described here.
1662    </p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="intro.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="intro.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="license.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part I.
1663   Introduction
1664
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