// Input streams -*- C++ -*-
-// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
-// 2006, 2007
-// Free Software Foundation, Inc.
+// Copyright (C) 1997-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License
-// along with this library; see the file COPYING. If not, write to
-// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-// Boston, MA 02110-1301, USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
//
// ISO C++ 14882: 27.6.1 Input streams
//
-/** @file istream
+/** @file include/istream
* This is a Standard C++ Library header.
*/
#pragma GCC system_header
#include <ios>
-#include <locale>
#include <ostream>
-#include <limits> // For numeric_limits
-_GLIBCXX_BEGIN_NAMESPACE(std)
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
- // [27.6.1.1] Template class basic_istream
/**
- * @brief Controlling input.
+ * @brief Template class basic_istream.
+ * @ingroup io
+ *
+ * @tparam _CharT Type of character stream.
+ * @tparam _Traits Traits for character type, defaults to
+ * char_traits<_CharT>.
*
* This is the base class for all input streams. It provides text
* formatting of all builtin types, and communicates with any class
{
public:
// Types (inherited from basic_ios (27.4.4)):
- typedef _CharT char_type;
+ typedef _CharT char_type;
typedef typename _Traits::int_type int_type;
typedef typename _Traits::pos_type pos_type;
typedef typename _Traits::off_type off_type;
- typedef _Traits traits_type;
-
+ typedef _Traits traits_type;
+
// Non-standard Types:
typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
typedef basic_ios<_CharT, _Traits> __ios_type;
typedef basic_istream<_CharT, _Traits> __istream_type;
- typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
+ typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
__num_get_type;
- typedef ctype<_CharT> __ctype_type;
-
- template<typename _CharT2, typename _Traits2>
- friend basic_istream<_CharT2, _Traits2>&
- operator>>(basic_istream<_CharT2, _Traits2>&, _CharT2&);
-
- template<typename _CharT2, typename _Traits2>
- friend basic_istream<_CharT2, _Traits2>&
- operator>>(basic_istream<_CharT2, _Traits2>&, _CharT2*);
-
+ typedef ctype<_CharT> __ctype_type;
+
protected:
// Data Members:
/**
- * @if maint
* The number of characters extracted in the previous unformatted
* function; see gcount().
- * @endif
*/
streamsize _M_gcount;
public:
- // [27.6.1.1.1] constructor/destructor
/**
* @brief Base constructor.
*
* derived classes' initialization lists, which pass a pointer to
* their own stream buffer.
*/
- explicit
- basic_istream(__streambuf_type* __sb): _M_gcount(streamsize(0))
+ explicit
+ basic_istream(__streambuf_type* __sb)
+ : _M_gcount(streamsize(0))
{ this->init(__sb); }
/**
*
* This does very little apart from providing a virtual base dtor.
*/
- virtual
- ~basic_istream()
+ virtual
+ ~basic_istream()
{ _M_gcount = streamsize(0); }
- // [27.6.1.1.2] prefix/suffix
+ /// Safe prefix/suffix operations.
class sentry;
friend class sentry;
- // [27.6.1.2] formatted input
- // [27.6.1.2.3] basic_istream::operator>>
//@{
/**
* @brief Interface for manipulators.
*
- * Manuipulators such as @c std::ws and @c std::dec use these
- * functions in constructs like "std::cin >> std::ws". For more
- * information, see the iomanip header.
+ * Manipulators such as @c std::ws and @c std::dec use these
+ * functions in constructs like
+ * <code>std::cin >> std::ws</code>.
+ * For more information, see the iomanip header.
*/
__istream_type&
operator>>(__istream_type& (*__pf)(__istream_type&))
__istream_type&
operator>>(__ios_type& (*__pf)(__ios_type&))
- {
+ {
__pf(*this);
return *this;
}
return *this;
}
//@}
-
- // [27.6.1.2.2] arithmetic extractors
+
+ //@{
/**
- * @name Arithmetic Extractors
+ * @name Extractors
*
* All the @c operator>> functions (aka <em>formatted input
* functions</em>) have some common behavior. Each starts by
* whatever data is appropriate for the type of the argument.
*
* If an exception is thrown during extraction, ios_base::badbit
- * will be turned on in the stream's error state without causing an
- * ios_base::failure to be thrown. The original exception will then
- * be rethrown.
+ * will be turned on in the stream's error state (without causing an
+ * ios_base::failure to be thrown) and the original exception will
+ * be rethrown if badbit is set in the exceptions mask.
*/
+
//@{
/**
- * @brief Basic arithmetic extractors
- * @param A variable of builtin type.
+ * @brief Integer arithmetic extractors
+ * @param __n A variable of builtin integral type.
* @return @c *this if successful
*
* These functions use the stream's current locale (specifically, the
* @c num_get facet) to parse the input data.
*/
- __istream_type&
+ __istream_type&
operator>>(bool& __n)
{ return _M_extract(__n); }
-
- __istream_type&
+
+ __istream_type&
operator>>(short& __n);
-
- __istream_type&
+
+ __istream_type&
operator>>(unsigned short& __n)
{ return _M_extract(__n); }
- __istream_type&
+ __istream_type&
operator>>(int& __n);
-
- __istream_type&
+
+ __istream_type&
operator>>(unsigned int& __n)
{ return _M_extract(__n); }
- __istream_type&
+ __istream_type&
operator>>(long& __n)
{ return _M_extract(__n); }
-
- __istream_type&
+
+ __istream_type&
operator>>(unsigned long& __n)
{ return _M_extract(__n); }
#ifdef _GLIBCXX_USE_LONG_LONG
- __istream_type&
+ __istream_type&
operator>>(long long& __n)
{ return _M_extract(__n); }
- __istream_type&
+ __istream_type&
operator>>(unsigned long long& __n)
{ return _M_extract(__n); }
#endif
+ //@}
- __istream_type&
+ //@{
+ /**
+ * @brief Floating point arithmetic extractors
+ * @param __f A variable of builtin floating point type.
+ * @return @c *this if successful
+ *
+ * These functions use the stream's current locale (specifically, the
+ * @c num_get facet) to parse the input data.
+ */
+ __istream_type&
operator>>(float& __f)
{ return _M_extract(__f); }
- __istream_type&
+ __istream_type&
operator>>(double& __f)
{ return _M_extract(__f); }
- __istream_type&
+ __istream_type&
operator>>(long double& __f)
{ return _M_extract(__f); }
+ //@}
- __istream_type&
+ /**
+ * @brief Basic arithmetic extractors
+ * @param __p A variable of pointer type.
+ * @return @c *this if successful
+ *
+ * These functions use the stream's current locale (specifically, the
+ * @c num_get facet) to parse the input data.
+ */
+ __istream_type&
operator>>(void*& __p)
{ return _M_extract(__p); }
/**
* @brief Extracting into another streambuf.
- * @param sb A pointer to a streambuf
+ * @param __sb A pointer to a streambuf
*
* This function behaves like one of the basic arithmetic extractors,
* in that it also constructs a sentry object and has the same error
* handling behavior.
*
- * If @a sb is NULL, the stream will set failbit in its error state.
+ * If @p __sb is NULL, the stream will set failbit in its error state.
*
* Characters are extracted from this stream and inserted into the
- * @a sb streambuf until one of the following occurs:
+ * @p __sb streambuf until one of the following occurs:
*
* - the input stream reaches end-of-file,
* - insertion into the output buffer fails (in this case, the
*
* If the function inserts no characters, failbit is set.
*/
- __istream_type&
+ __istream_type&
operator>>(__streambuf_type* __sb);
//@}
-
+
// [27.6.1.3] unformatted input
/**
* @brief Character counting
* @return The number of characters extracted by the previous
* unformatted input function dispatched for this stream.
*/
- streamsize
- gcount() const
+ streamsize
+ gcount() const
{ return _M_gcount; }
-
+
+ //@{
/**
* @name Unformatted Input Functions
*
* by gcount().
*
* If an exception is thrown during extraction, ios_base::badbit
- * will be turned on in the stream's error state without causing an
- * ios_base::failure to be thrown. The original exception will then
- * be rethrown.
+ * will be turned on in the stream's error state (without causing an
+ * ios_base::failure to be thrown) and the original exception will
+ * be rethrown if badbit is set in the exceptions mask.
*/
- //@{
+
/**
* @brief Simple extraction.
* @return A character, or eof().
* Tries to extract a character. If none are available, sets failbit
* and returns traits::eof().
*/
- int_type
+ int_type
get();
/**
* @brief Simple extraction.
- * @param c The character in which to store data.
+ * @param __c The character in which to store data.
* @return *this
*
- * Tries to extract a character and store it in @a c. If none are
+ * Tries to extract a character and store it in @a __c. If none are
* available, sets failbit and returns traits::eof().
*
* @note This function is not overloaded on signed char and
* unsigned char.
*/
- __istream_type&
+ __istream_type&
get(char_type& __c);
/**
* @brief Simple multiple-character extraction.
- * @param s Pointer to an array.
- * @param n Maximum number of characters to store in @a s.
- * @param delim A "stop" character.
+ * @param __s Pointer to an array.
+ * @param __n Maximum number of characters to store in @a __s.
+ * @param __delim A "stop" character.
* @return *this
*
- * Characters are extracted and stored into @a s until one of the
+ * Characters are extracted and stored into @a __s until one of the
* following happens:
*
- * - @c n-1 characters are stored
+ * - @c __n-1 characters are stored
* - the input sequence reaches EOF
- * - the next character equals @a delim, in which case the character
+ * - the next character equals @a __delim, in which case the character
* is not extracted
*
* If no characters are stored, failbit is set in the stream's error
* @note This function is not overloaded on signed char and
* unsigned char.
*/
- __istream_type&
+ __istream_type&
get(char_type* __s, streamsize __n, char_type __delim);
/**
* @brief Simple multiple-character extraction.
- * @param s Pointer to an array.
- * @param n Maximum number of characters to store in @a s.
+ * @param __s Pointer to an array.
+ * @param __n Maximum number of characters to store in @a s.
* @return *this
*
- * Returns @c get(s,n,widen('\n')).
+ * Returns @c get(__s,__n,widen('\\n')).
*/
- __istream_type&
+ __istream_type&
get(char_type* __s, streamsize __n)
{ return this->get(__s, __n, this->widen('\n')); }
/**
* @brief Extraction into another streambuf.
- * @param sb A streambuf in which to store data.
- * @param delim A "stop" character.
+ * @param __sb A streambuf in which to store data.
+ * @param __delim A "stop" character.
* @return *this
*
- * Characters are extracted and inserted into @a sb until one of the
+ * Characters are extracted and inserted into @a __sb until one of the
* following happens:
*
* - the input sequence reaches EOF
* - insertion into the output buffer fails (in this case, the
* character that would have been inserted is not extracted)
- * - the next character equals @a delim (in this case, the character
+ * - the next character equals @a __delim (in this case, the character
* is not extracted)
* - an exception occurs (and in this case is caught)
*
/**
* @brief Extraction into another streambuf.
- * @param sb A streambuf in which to store data.
+ * @param __sb A streambuf in which to store data.
* @return *this
*
- * Returns @c get(sb,widen('\n')).
+ * Returns @c get(__sb,widen('\\n')).
*/
__istream_type&
get(__streambuf_type& __sb)
/**
* @brief String extraction.
- * @param s A character array in which to store the data.
- * @param n Maximum number of characters to extract.
- * @param delim A "stop" character.
+ * @param __s A character array in which to store the data.
+ * @param __n Maximum number of characters to extract.
+ * @param __delim A "stop" character.
* @return *this
*
- * Extracts and stores characters into @a s until one of the
+ * Extracts and stores characters into @a __s until one of the
* following happens. Note that these criteria are required to be
* tested in the order listed here, to allow an input line to exactly
- * fill the @a s array without setting failbit.
+ * fill the @a __s array without setting failbit.
*
* -# the input sequence reaches end-of-file, in which case eofbit
* is set in the stream error state
- * -# the next character equals @c delim, in which case the character
+ * -# the next character equals @c __delim, in which case the character
* is extracted (and therefore counted in @c gcount()) but not stored
- * -# @c n-1 characters are stored, in which case failbit is set
+ * -# @c __n-1 characters are stored, in which case failbit is set
* in the stream error state
*
* If no characters are extracted, failbit is set. (An empty line of
* In any case, a null character is stored in the next location in
* the array.
*/
- __istream_type&
+ __istream_type&
getline(char_type* __s, streamsize __n, char_type __delim);
/**
* @brief String extraction.
- * @param s A character array in which to store the data.
- * @param n Maximum number of characters to extract.
+ * @param __s A character array in which to store the data.
+ * @param __n Maximum number of characters to extract.
* @return *this
*
- * Returns @c getline(s,n,widen('\n')).
+ * Returns @c getline(__s,__n,widen('\\n')).
*/
- __istream_type&
+ __istream_type&
getline(char_type* __s, streamsize __n)
{ return this->getline(__s, __n, this->widen('\n')); }
/**
* @brief Discarding characters
- * @param n Number of characters to discard.
- * @param delim A "stop" character.
+ * @param __n Number of characters to discard.
+ * @param __delim A "stop" character.
* @return *this
*
* Extracts characters and throws them away until one of the
* following happens:
- * - if @a n @c != @c std::numeric_limits<int>::max(), @a n
+ * - if @a __n @c != @c std::numeric_limits<int>::max(), @a __n
* characters are extracted
* - the input sequence reaches end-of-file
- * - the next character equals @a delim (in this case, the character
+ * - the next character equals @a __delim (in this case, the character
* is extracted); note that this condition will never occur if
- * @a delim equals @c traits::eof().
+ * @a __delim equals @c traits::eof().
*
* NB: Provide three overloads, instead of the single function
* (with defaults) mandated by the Standard: this leads to a
* better performing implementation, while still conforming to
* the Standard.
*/
- __istream_type&
- ignore();
+ __istream_type&
+ ignore(streamsize __n, int_type __delim);
- __istream_type&
+ __istream_type&
ignore(streamsize __n);
- __istream_type&
- ignore(streamsize __n, int_type __delim);
-
+ __istream_type&
+ ignore();
+
/**
* @brief Looking ahead in the stream
* @return The next character, or eof().
* returns @c traits::eof(). Otherwise reads but does not extract
* the next input character.
*/
- int_type
+ int_type
peek();
-
+
/**
* @brief Extraction without delimiters.
- * @param s A character array.
- * @param n Maximum number of characters to store.
+ * @param __s A character array.
+ * @param __n Maximum number of characters to store.
* @return *this
*
* If the stream state is @c good(), extracts characters and stores
- * them into @a s until one of the following happens:
- * - @a n characters are stored
+ * them into @a __s until one of the following happens:
+ * - @a __n characters are stored
* - the input sequence reaches end-of-file, in which case the error
* state is set to @c failbit|eofbit.
*
* @note This function is not overloaded on signed char and
* unsigned char.
*/
- __istream_type&
+ __istream_type&
read(char_type* __s, streamsize __n);
/**
* @brief Extraction until the buffer is exhausted, but no more.
- * @param s A character array.
- * @param n Maximum number of characters to store.
+ * @param __s A character array.
+ * @param __n Maximum number of characters to store.
* @return The number of characters extracted.
*
- * Extracts characters and stores them into @a s depending on the
+ * Extracts characters and stores them into @a __s depending on the
* number of characters remaining in the streambuf's buffer,
* @c rdbuf()->in_avail(), called @c A here:
* - if @c A @c == @c -1, sets eofbit and extracts no characters
* The goal is to empty the current buffer, and to not request any
* more from the external input sequence controlled by the streambuf.
*/
- streamsize
+ streamsize
readsome(char_type* __s, streamsize __n);
-
+
/**
* @brief Unextracting a single character.
- * @param c The character to push back into the input stream.
+ * @param __c The character to push back into the input stream.
* @return *this
*
* If @c rdbuf() is not null, calls @c rdbuf()->sputbackc(c).
* If @c rdbuf() is null or if @c sputbackc() fails, sets badbit in
* the error state.
*
- * @note Since no characters are extracted, the next call to
- * @c gcount() will return 0, as required by DR 60.
+ * @note This function first clears eofbit. Since no characters
+ * are extracted, the next call to @c gcount() will return 0,
+ * as required by DR 60.
*/
- __istream_type&
+ __istream_type&
putback(char_type __c);
/**
* If @c rdbuf() is null or if @c sungetc() fails, sets badbit in
* the error state.
*
- * @note Since no characters are extracted, the next call to
- * @c gcount() will return 0, as required by DR 60.
+ * @note This function first clears eofbit. Since no characters
+ * are extracted, the next call to @c gcount() will return 0,
+ * as required by DR 60.
*/
- __istream_type&
+ __istream_type&
unget();
/**
* extracted, if any, and therefore does not affect the next
* call to @c gcount().
*/
- int
+ int
sync();
/**
*
* @note This function does not count the number of characters
* extracted, if any, and therefore does not affect the next
- * call to @c gcount().
+ * call to @c gcount(). At variance with putback, unget and
+ * seekg, eofbit is not cleared first.
*/
- pos_type
+ pos_type
tellg();
/**
* @brief Changing the current read position.
- * @param pos A file position object.
+ * @param __pos A file position object.
* @return *this
*
- * If @c fail() is not true, calls @c rdbuf()->pubseekpos(pos). If
+ * If @c fail() is not true, calls @c rdbuf()->pubseekpos(__pos). If
* that function fails, sets failbit.
*
- * @note This function does not count the number of characters
- * extracted, if any, and therefore does not affect the next
- * call to @c gcount().
+ * @note This function first clears eofbit. It does not count the
+ * number of characters extracted, if any, and therefore does
+ * not affect the next call to @c gcount().
*/
- __istream_type&
+ __istream_type&
seekg(pos_type);
/**
* @brief Changing the current read position.
- * @param off A file offset object.
- * @param dir The direction in which to seek.
+ * @param __off A file offset object.
+ * @param __dir The direction in which to seek.
* @return *this
*
- * If @c fail() is not true, calls @c rdbuf()->pubseekoff(off,dir).
+ * If @c fail() is not true, calls @c rdbuf()->pubseekoff(__off,__dir).
* If that function fails, sets failbit.
*
- * @note This function does not count the number of characters
- * extracted, if any, and therefore does not affect the next
- * call to @c gcount().
+ * @note This function first clears eofbit. It does not count the
+ * number of characters extracted, if any, and therefore does
+ * not affect the next call to @c gcount().
*/
- __istream_type&
+ __istream_type&
seekg(off_type, ios_base::seekdir);
//@}
protected:
- explicit
- basic_istream(): _M_gcount(streamsize(0)) { }
+ basic_istream()
+ : _M_gcount(streamsize(0))
+ { this->init(0); }
+
+#if __cplusplus >= 201103L
+ basic_istream(const basic_istream&) = delete;
+
+ basic_istream(basic_istream&& __rhs)
+ : __ios_type(), _M_gcount(__rhs._M_gcount)
+ {
+ __ios_type::move(__rhs);
+ __rhs._M_gcount = 0;
+ }
+
+ // 27.7.3.3 Assign/swap
+
+ basic_istream& operator=(const basic_istream&) = delete;
+
+ basic_istream&
+ operator=(basic_istream&& __rhs)
+ {
+ swap(__rhs);
+ return *this;
+ }
+
+ void
+ swap(basic_istream& __rhs)
+ {
+ __ios_type::swap(__rhs);
+ std::swap(_M_gcount, __rhs._M_gcount);
+ }
+#endif
template<typename _ValueT>
- __istream_type&
- _M_extract(_ValueT& __v);
+ __istream_type&
+ _M_extract(_ValueT& __v);
};
- // Explicit specialization declarations, defined in src/istream.cc.
- template<>
- basic_istream<char>&
+ /// Explicit specialization declarations, defined in src/istream.cc.
+ template<>
+ basic_istream<char>&
basic_istream<char>::
getline(char_type* __s, streamsize __n, char_type __delim);
-
+
template<>
basic_istream<char>&
basic_istream<char>::
ignore(streamsize __n);
-
+
template<>
basic_istream<char>&
basic_istream<char>::
ignore(streamsize __n, int_type __delim);
#ifdef _GLIBCXX_USE_WCHAR_T
- template<>
- basic_istream<wchar_t>&
+ template<>
+ basic_istream<wchar_t>&
basic_istream<wchar_t>::
getline(char_type* __s, streamsize __n, char_type __delim);
basic_istream<wchar_t>&
basic_istream<wchar_t>::
ignore(streamsize __n);
-
+
template<>
basic_istream<wchar_t>&
basic_istream<wchar_t>::
* @brief Performs setup work for input streams.
*
* Objects of this class are created before all of the standard
- * extractors are run. It is responsible for "exception-safe prefix and
- * suffix operations," although only prefix actions are currently required
- * by the standard. Additional actions may be added by the
- * implementation, and we list them in
- * http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/howto.html#5
- * under [27.6] notes.
+ * extractors are run. It is responsible for <em>exception-safe
+ * prefix and suffix operations,</em> although only prefix actions
+ * are currently required by the standard.
*/
template<typename _CharT, typename _Traits>
class basic_istream<_CharT, _Traits>::sentry
{
+ // Data Members.
+ bool _M_ok;
+
public:
- /// Easy access to dependant types.
+ /// Easy access to dependent types.
typedef _Traits traits_type;
typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
typedef basic_istream<_CharT, _Traits> __istream_type;
/**
* @brief The constructor performs all the work.
- * @param is The input stream to guard.
- * @param noskipws Whether to consume whitespace or not.
+ * @param __is The input stream to guard.
+ * @param __noskipws Whether to consume whitespace or not.
*
- * If the stream state is good (@a is.good() is true), then the
- * following actions are performed, otherwise the sentry state is
- * false ("not okay") and failbit is set in the stream state.
+ * If the stream state is good (@a __is.good() is true), then the
+ * following actions are performed, otherwise the sentry state
+ * is false (<em>not okay</em>) and failbit is set in the
+ * stream state.
*
* The sentry's preparatory actions are:
*
* -# if the stream is tied to an output stream, @c is.tie()->flush()
* is called to synchronize the output sequence
- * -# if @a noskipws is false, and @c ios_base::skipws is set in
+ * -# if @a __noskipws is false, and @c ios_base::skipws is set in
* @c is.flags(), the sentry extracts and discards whitespace
* characters from the stream. The currently imbued locale is
* used to determine whether each character is whitespace.
*
* If the stream state is still good, then the sentry state becomes
- * true ("okay").
+ * true (@a okay).
*/
- explicit
+ explicit
sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
/**
* For ease of use, sentries may be converted to booleans. The
* return value is that of the sentry state (true == okay).
*/
+#if __cplusplus >= 201103L
+ explicit
+#endif
operator bool() const
{ return _M_ok; }
-
- private:
- bool _M_ok;
};
- // [27.6.1.2.3] character extraction templates
//@{
/**
* @brief Character extractors
- * @param in An input stream.
- * @param c A character reference.
+ * @param __in An input stream.
+ * @param __c A character reference.
* @return in
*
* Behaves like one of the formatted arithmetic extractors described in
* std::basic_istream. After constructing a sentry object with good
* status, this function extracts a character (if one is available) and
- * stores it in @a c. Otherwise, sets failbit in the input stream.
+ * stores it in @a __c. Otherwise, sets failbit in the input stream.
*/
template<typename _CharT, typename _Traits>
basic_istream<_CharT, _Traits>&
//@{
/**
* @brief Character string extractors
- * @param in An input stream.
- * @param s A pointer to a character array.
- * @return in
+ * @param __in An input stream.
+ * @param __s A pointer to a character array.
+ * @return __in
*
* Behaves like one of the formatted arithmetic extractors described in
* std::basic_istream. After constructing a sentry object with good
* status, this function extracts up to @c n characters and stores them
- * into the array starting at @a s. @c n is defined as:
+ * into the array starting at @a __s. @c n is defined as:
*
- * - if @c width() is greater than zero, @c n is width()
- * - otherwise @c n is "the number of elements of the largest array of
- * @c char_type that can store a terminating @c eos." [27.6.1.2.3]/6
+ * - if @c width() is greater than zero, @c n is width() otherwise
+ * - @c n is <em>the number of elements of the largest array of *
+ * - @c char_type that can store a terminating @c eos.</em>
+ * - [27.6.1.2.3]/6
*
* Characters are extracted and stored until one of the following happens:
* - @c n-1 characters are stored
{ return (__in >> reinterpret_cast<char*>(__s)); }
//@}
- // 27.6.1.5 Template class basic_iostream
/**
- * @brief Merging istream and ostream capabilities.
+ * @brief Template class basic_iostream
+ * @ingroup io
+ *
+ * @tparam _CharT Type of character stream.
+ * @tparam _Traits Traits for character type, defaults to
+ * char_traits<_CharT>.
*
* This class multiply inherits from the input and output stream classes
* simply to provide a single interface.
*/
template<typename _CharT, typename _Traits>
class basic_iostream
- : public basic_istream<_CharT, _Traits>,
+ : public basic_istream<_CharT, _Traits>,
public basic_ostream<_CharT, _Traits>
{
public:
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 271. basic_iostream missing typedefs
// Types (inherited):
- typedef _CharT char_type;
+ typedef _CharT char_type;
typedef typename _Traits::int_type int_type;
typedef typename _Traits::pos_type pos_type;
typedef typename _Traits::off_type off_type;
- typedef _Traits traits_type;
+ typedef _Traits traits_type;
// Non-standard Types:
typedef basic_istream<_CharT, _Traits> __istream_type;
* Both of the parent classes are initialized with the same
* streambuf pointer passed to this constructor.
*/
- explicit
+ explicit
basic_iostream(basic_streambuf<_CharT, _Traits>* __sb)
- : __istream_type(), __ostream_type()
- { this->init(__sb); }
+ : __istream_type(__sb), __ostream_type(__sb) { }
/**
* @brief Destructor does nothing.
*/
- virtual
+ virtual
~basic_iostream() { }
protected:
- explicit
- basic_iostream() : __istream_type(), __ostream_type()
+ basic_iostream()
+ : __istream_type(), __ostream_type() { }
+
+#if __cplusplus >= 201103L
+ basic_iostream(const basic_iostream&) = delete;
+
+ basic_iostream(basic_iostream&& __rhs)
+ : __istream_type(std::move(__rhs)), __ostream_type(*this)
{ }
+
+ // 27.7.3.3 Assign/swap
+
+ basic_iostream& operator=(const basic_iostream&) = delete;
+
+ basic_iostream&
+ operator=(basic_iostream&& __rhs)
+ {
+ swap(__rhs);
+ return *this;
+ }
+
+ void
+ swap(basic_iostream& __rhs)
+ { __istream_type::swap(__rhs); }
+#endif
};
- // [27.6.1.4] standard basic_istream manipulators
/**
* @brief Quick and easy way to eat whitespace
*
* std::basic_istream::sentry inside your definition of operator>>.
*/
template<typename _CharT, typename _Traits>
- basic_istream<_CharT, _Traits>&
+ basic_istream<_CharT, _Traits>&
ws(basic_istream<_CharT, _Traits>& __is);
-_GLIBCXX_END_NAMESPACE
+#if __cplusplus >= 201103L
+ template<typename _Ch, typename _Up>
+ basic_istream<_Ch, _Up>&
+ __is_convertible_to_basic_istream_test(basic_istream<_Ch, _Up>*);
-#ifndef _GLIBCXX_EXPORT_TEMPLATE
-# include <bits/istream.tcc>
-#endif
+ template<typename _Tp, typename = void>
+ struct __is_convertible_to_basic_istream_impl
+ {
+ using __istream_type = void;
+ };
+
+ template<typename _Tp>
+ using __do_is_convertible_to_basic_istream_impl =
+ decltype(__is_convertible_to_basic_istream_test
+ (declval<typename remove_reference<_Tp>::type*>()));
+
+ template<typename _Tp>
+ struct __is_convertible_to_basic_istream_impl
+ <_Tp,
+ __void_t<__do_is_convertible_to_basic_istream_impl<_Tp>>>
+ {
+ using __istream_type =
+ __do_is_convertible_to_basic_istream_impl<_Tp>;
+ };
+
+ template<typename _Tp>
+ struct __is_convertible_to_basic_istream
+ : __is_convertible_to_basic_istream_impl<_Tp>
+ {
+ public:
+ using type = __not_<is_void<
+ typename __is_convertible_to_basic_istream_impl<_Tp>::__istream_type>>;
+ constexpr static bool value = type::value;
+ };
+
+ template<typename _Istream, typename _Tp, typename = void>
+ struct __is_extractable : false_type {};
+
+ template<typename _Istream, typename _Tp>
+ struct __is_extractable<_Istream, _Tp,
+ __void_t<decltype(declval<_Istream&>()
+ >> declval<_Tp>())>>
+ : true_type {};
+
+ template<typename _Istream>
+ using __rvalue_istream_type =
+ typename __is_convertible_to_basic_istream<
+ _Istream>::__istream_type;
+
+ // [27.7.1.6] Rvalue stream extraction
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2328. Rvalue stream extraction should use perfect forwarding
+ /**
+ * @brief Generic extractor for rvalue stream
+ * @param __is An input stream.
+ * @param __x A reference to the extraction target.
+ * @return is
+ *
+ * This is just a forwarding function to allow extraction from
+ * rvalue streams since they won't bind to the extractor functions
+ * that take an lvalue reference.
+ */
+ template<typename _Istream, typename _Tp>
+ inline
+ typename enable_if<__and_<__not_<is_lvalue_reference<_Istream>>,
+ __is_convertible_to_basic_istream<_Istream>,
+ __is_extractable<
+ __rvalue_istream_type<_Istream>,
+ _Tp&&>>::value,
+ __rvalue_istream_type<_Istream>>::type
+ operator>>(_Istream&& __is, _Tp&& __x)
+ {
+ __rvalue_istream_type<_Istream> __ret_is = __is;
+ __ret_is >> std::forward<_Tp>(__x);
+ return __ret_is;
+ }
+#endif // C++11
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#include <bits/istream.tcc>
#endif /* _GLIBCXX_ISTREAM */
projects / thirdparty / gcc.git / blobdiff