libstdc++-v3/src/c++11/compatibility-c++0x.cc

   1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
   2
   3 // Copyright (C) 2009-2013 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #define _GLIBCXX_COMPATIBILITY_CXX0X
  26 #include <string>
  27 #include <system_error>
  28
  29 #if __cplusplus < 201103L
  30 # error "compatibility-c++0x.cc must be compiled with -std=gnu++0x"
  31 #endif
  32
  33 #ifdef _GLIBCXX_SHARED
  34
  35 namespace std _GLIBCXX_VISIBILITY(default)
  36 {
  37   // gcc-4.4.0
  38   // <mutex> exported std::lock_error
  39 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  40   class lock_error : public exception
  41   {
  42   public:
  43     virtual const char*
  44     _GLIBCXX_CONST what() const throw();
  45   };
  46
  47   const char*
  48   lock_error::what() const throw()
  49   { return "std::lock_error"; }
  50 #endif
  51
  52   // We need these due to the symbols exported since GLIBCXX_3.4.10.
  53   // See libstdc++/41662 for details.
  54
  55 #ifndef _GLIBCXX_LONG_DOUBLE_COMPAT_IMPL
  56   template<>
  57     struct hash<string>
  58     {
  59       size_t operator()(string) const;
  60     };
  61
  62   size_t
  63   hash<string>::operator()(string __s) const
  64   { return _Hash_impl::hash(__s.data(), __s.length()); }
  65
  66   template<>
  67     struct hash<const string&>
  68     {
  69       size_t operator()(const string&) const;
  70     };
  71
  72   size_t
  73   hash<const string&>::operator()(const string& __s) const
  74   { return _Hash_impl::hash(__s.data(), __s.length()); }
  75
  76 #ifdef _GLIBCXX_USE_WCHAR_T
  77   template<>
  78     struct hash<wstring>
  79     {
  80       size_t operator()(wstring) const;
  81     };
  82
  83   size_t
  84   hash<wstring>::operator()(wstring __s) const
  85   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  86
  87   template<>
  88     struct hash<const wstring&>
  89     {
  90       size_t operator()(const wstring&) const;
  91     };
  92
  93   size_t
  94   hash<const wstring&>::operator()(const wstring& __s) const
  95   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  96 #endif
  97 #endif
  98
  99   template<>
 100     struct hash<error_code>
 101     {
 102       size_t operator()(error_code) const;
 103     };
 104
 105   size_t
 106   hash<error_code>::operator()(error_code __e) const
 107   {
 108     const size_t __tmp = std::_Hash_impl::hash(__e._M_value);
 109     return std::_Hash_impl::__hash_combine(__e._M_cat, __tmp);
 110   }
 111
 112   // gcc-4.7.0
 113   // <chrono> changes is_monotonic to is_steady.
 114   namespace chrono
 115   {
 116     struct system_clock
 117     {
 118       static constexpr bool is_monotonic = false;
 119     };
 120     constexpr bool system_clock::is_monotonic;
 121   } // namespace chrono
 122
 123   // gcc-4.9.0
 124   // LWG 2145 changes this constructor to constexpr i.e. inline
 125   error_category::error_category() noexcept = default;
 126 }
 127
 128 #endif