LCOV - code coverage report
Current view: top level - usr/include/c++/4.9 - ostream (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 27 0.0 %
Date: 2016-12-01 18:45:36 Functions: 0 12 0.0 %

          Line data    Source code
       1             : // Output streams -*- C++ -*-
       2             : 
       3             : // Copyright (C) 1997-2014 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             : /** @file include/ostream
      26             :  *  This is a Standard C++ Library header.
      27             :  */
      28             : 
      29             : //
      30             : // ISO C++ 14882: 27.6.2  Output streams
      31             : //
      32             : 
      33             : #ifndef _GLIBCXX_OSTREAM
      34             : #define _GLIBCXX_OSTREAM 1
      35             : 
      36             : #pragma GCC system_header
      37             : 
      38             : #include <ios>
      39             : #include <bits/ostream_insert.h>
      40             : 
      41             : namespace std _GLIBCXX_VISIBILITY(default)
      42             : {
      43             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      44             : 
      45             :   /**
      46             :    *  @brief  Template class basic_ostream.
      47             :    *  @ingroup io
      48             :    *
      49             :    *  @tparam _CharT  Type of character stream.
      50             :    *  @tparam _Traits  Traits for character type, defaults to
      51             :    *                   char_traits<_CharT>.
      52             :    *
      53             :    *  This is the base class for all output streams.  It provides text
      54             :    *  formatting of all builtin types, and communicates with any class
      55             :    *  derived from basic_streambuf to do the actual output.
      56             :   */
      57             :   template<typename _CharT, typename _Traits>
      58             :     class basic_ostream : virtual public basic_ios<_CharT, _Traits>
      59             :     {
      60             :     public:
      61             :       // Types (inherited from basic_ios):
      62             :       typedef _CharT                                    char_type;
      63             :       typedef typename _Traits::int_type                int_type;
      64             :       typedef typename _Traits::pos_type                pos_type;
      65             :       typedef typename _Traits::off_type                off_type;
      66             :       typedef _Traits                                   traits_type;
      67             : 
      68             :       // Non-standard Types:
      69             :       typedef basic_streambuf<_CharT, _Traits>            __streambuf_type;
      70             :       typedef basic_ios<_CharT, _Traits>          __ios_type;
      71             :       typedef basic_ostream<_CharT, _Traits>              __ostream_type;
      72             :       typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
      73             :                                                         __num_put_type;
      74             :       typedef ctype<_CharT>                               __ctype_type;
      75             : 
      76             :       /**
      77             :        *  @brief  Base constructor.
      78             :        *
      79             :        *  This ctor is almost never called by the user directly, rather from
      80             :        *  derived classes' initialization lists, which pass a pointer to
      81             :        *  their own stream buffer.
      82             :       */
      83             :       explicit
      84             :       basic_ostream(__streambuf_type* __sb)
      85             :       { this->init(__sb); }
      86             : 
      87             :       /**
      88             :        *  @brief  Base destructor.
      89             :        *
      90             :        *  This does very little apart from providing a virtual base dtor.
      91             :       */
      92             :       virtual
      93           0 :       ~basic_ostream() { }
      94             : 
      95             :       /// Safe prefix/suffix operations.
      96             :       class sentry;
      97             :       friend class sentry;
      98             : 
      99             :       //@{
     100             :       /**
     101             :        *  @brief  Interface for manipulators.
     102             :        *
     103             :        *  Manipulators such as @c std::endl and @c std::hex use these
     104             :        *  functions in constructs like "std::cout << std::endl".  For more
     105             :        *  information, see the iomanip header.
     106             :       */
     107             :       __ostream_type&
     108           0 :       operator<<(__ostream_type& (*__pf)(__ostream_type&))
     109             :       {
     110             :         // _GLIBCXX_RESOLVE_LIB_DEFECTS
     111             :         // DR 60. What is a formatted input function?
     112             :         // The inserters for manipulators are *not* formatted output functions.
     113           0 :         return __pf(*this);
     114             :       }
     115             : 
     116             :       __ostream_type&
     117             :       operator<<(__ios_type& (*__pf)(__ios_type&))
     118             :       {
     119             :         // _GLIBCXX_RESOLVE_LIB_DEFECTS
     120             :         // DR 60. What is a formatted input function?
     121             :         // The inserters for manipulators are *not* formatted output functions.
     122             :         __pf(*this);
     123             :         return *this;
     124             :       }
     125             : 
     126             :       __ostream_type&
     127             :       operator<<(ios_base& (*__pf) (ios_base&))
     128             :       {
     129             :         // _GLIBCXX_RESOLVE_LIB_DEFECTS
     130             :         // DR 60. What is a formatted input function?
     131             :         // The inserters for manipulators are *not* formatted output functions.
     132             :         __pf(*this);
     133             :         return *this;
     134             :       }
     135             :       //@}
     136             : 
     137             :       //@{
     138             :       /**
     139             :        *  @name Inserters
     140             :        *
     141             :        *  All the @c operator<< functions (aka <em>formatted output
     142             :        *  functions</em>) have some common behavior.  Each starts by
     143             :        *  constructing a temporary object of type std::basic_ostream::sentry.
     144             :        *  This can have several effects, concluding with the setting of a
     145             :        *  status flag; see the sentry documentation for more.
     146             :        *
     147             :        *  If the sentry status is good, the function tries to generate
     148             :        *  whatever data is appropriate for the type of the argument.
     149             :        *
     150             :        *  If an exception is thrown during insertion, ios_base::badbit
     151             :        *  will be turned on in the stream's error state without causing an
     152             :        *  ios_base::failure to be thrown.  The original exception will then
     153             :        *  be rethrown.
     154             :       */
     155             : 
     156             :       //@{
     157             :       /**
     158             :        *  @brief Integer arithmetic inserters
     159             :        *  @param  __n A variable of builtin integral type.
     160             :        *  @return  @c *this if successful
     161             :        *
     162             :        *  These functions use the stream's current locale (specifically, the
     163             :        *  @c num_get facet) to perform numeric formatting.
     164             :       */
     165             :       __ostream_type&
     166           0 :       operator<<(long __n)
     167           0 :       { return _M_insert(__n); }
     168             : 
     169             :       __ostream_type&
     170           0 :       operator<<(unsigned long __n)
     171           0 :       { return _M_insert(__n); }
     172             : 
     173             :       __ostream_type&
     174           0 :       operator<<(bool __n)
     175           0 :       { return _M_insert(__n); }
     176             : 
     177             :       __ostream_type&
     178             :       operator<<(short __n);
     179             : 
     180             :       __ostream_type&
     181           0 :       operator<<(unsigned short __n)
     182             :       {
     183             :         // _GLIBCXX_RESOLVE_LIB_DEFECTS
     184             :         // 117. basic_ostream uses nonexistent num_put member functions.
     185           0 :         return _M_insert(static_cast<unsigned long>(__n));
     186             :       }
     187             : 
     188             :       __ostream_type&
     189             :       operator<<(int __n);
     190             : 
     191             :       __ostream_type&
     192           0 :       operator<<(unsigned int __n)
     193             :       {
     194             :         // _GLIBCXX_RESOLVE_LIB_DEFECTS
     195             :         // 117. basic_ostream uses nonexistent num_put member functions.
     196           0 :         return _M_insert(static_cast<unsigned long>(__n));
     197             :       }
     198             : 
     199             : #ifdef _GLIBCXX_USE_LONG_LONG
     200             :       __ostream_type&
     201             :       operator<<(long long __n)
     202             :       { return _M_insert(__n); }
     203             : 
     204             :       __ostream_type&
     205             :       operator<<(unsigned long long __n)
     206             :       { return _M_insert(__n); }
     207             : #endif
     208             :       //@}
     209             : 
     210             :       //@{
     211             :       /**
     212             :        *  @brief  Floating point arithmetic inserters
     213             :        *  @param  __f A variable of builtin floating point type.
     214             :        *  @return  @c *this if successful
     215             :        *
     216             :        *  These functions use the stream's current locale (specifically, the
     217             :        *  @c num_get facet) to perform numeric formatting.
     218             :       */
     219             :       __ostream_type&
     220             :       operator<<(double __f)
     221             :       { return _M_insert(__f); }
     222             : 
     223             :       __ostream_type&
     224             :       operator<<(float __f)
     225             :       {
     226             :         // _GLIBCXX_RESOLVE_LIB_DEFECTS
     227             :         // 117. basic_ostream uses nonexistent num_put member functions.
     228             :         return _M_insert(static_cast<double>(__f));
     229             :       }
     230             : 
     231             :       __ostream_type&
     232             :       operator<<(long double __f)
     233             :       { return _M_insert(__f); }
     234             :       //@}
     235             : 
     236             :       /**
     237             :        *  @brief  Pointer arithmetic inserters
     238             :        *  @param  __p A variable of pointer type.
     239             :        *  @return  @c *this if successful
     240             :        *
     241             :        *  These functions use the stream's current locale (specifically, the
     242             :        *  @c num_get facet) to perform numeric formatting.
     243             :       */
     244             :       __ostream_type&
     245             :       operator<<(const void* __p)
     246             :       { return _M_insert(__p); }
     247             : 
     248             :       /**
     249             :        *  @brief  Extracting from another streambuf.
     250             :        *  @param  __sb  A pointer to a streambuf
     251             :        *
     252             :        *  This function behaves like one of the basic arithmetic extractors,
     253             :        *  in that it also constructs a sentry object and has the same error
     254             :        *  handling behavior.
     255             :        *
     256             :        *  If @p __sb is NULL, the stream will set failbit in its error state.
     257             :        *
     258             :        *  Characters are extracted from @p __sb and inserted into @c *this
     259             :        *  until one of the following occurs:
     260             :        *
     261             :        *  - the input stream reaches end-of-file,
     262             :        *  - insertion into the output sequence fails (in this case, the
     263             :        *    character that would have been inserted is not extracted), or
     264             :        *  - an exception occurs while getting a character from @p __sb, which
     265             :        *    sets failbit in the error state
     266             :        *
     267             :        *  If the function inserts no characters, failbit is set.
     268             :       */
     269             :       __ostream_type&
     270             :       operator<<(__streambuf_type* __sb);
     271             :       //@}
     272             : 
     273             :       //@{
     274             :       /**
     275             :        *  @name Unformatted Output Functions
     276             :        *
     277             :        *  All the unformatted output functions have some common behavior.
     278             :        *  Each starts by constructing a temporary object of type
     279             :        *  std::basic_ostream::sentry.  This has several effects, concluding
     280             :        *  with the setting of a status flag; see the sentry documentation
     281             :        *  for more.
     282             :        *
     283             :        *  If the sentry status is good, the function tries to generate
     284             :        *  whatever data is appropriate for the type of the argument.
     285             :        *
     286             :        *  If an exception is thrown during insertion, ios_base::badbit
     287             :        *  will be turned on in the stream's error state.  If badbit is on in
     288             :        *  the stream's exceptions mask, the exception will be rethrown
     289             :        *  without completing its actions.
     290             :       */
     291             : 
     292             :       /**
     293             :        *  @brief  Simple insertion.
     294             :        *  @param  __c  The character to insert.
     295             :        *  @return  *this
     296             :        *
     297             :        *  Tries to insert @p __c.
     298             :        *
     299             :        *  @note  This function is not overloaded on signed char and
     300             :        *         unsigned char.
     301             :       */
     302             :       __ostream_type&
     303             :       put(char_type __c);
     304             : 
     305             :       /**
     306             :        *  @brief  Core write functionality, without sentry.
     307             :        *  @param  __s  The array to insert.
     308             :        *  @param  __n  Maximum number of characters to insert.
     309             :       */
     310             :       void
     311             :       _M_write(const char_type* __s, streamsize __n)
     312             :       {
     313             :         const streamsize __put = this->rdbuf()->sputn(__s, __n);
     314             :         if (__put != __n)
     315             :           this->setstate(ios_base::badbit);
     316             :       }
     317             : 
     318             :       /**
     319             :        *  @brief  Character string insertion.
     320             :        *  @param  __s  The array to insert.
     321             :        *  @param  __n  Maximum number of characters to insert.
     322             :        *  @return  *this
     323             :        *
     324             :        *  Characters are copied from @p __s and inserted into the stream until
     325             :        *  one of the following happens:
     326             :        *
     327             :        *  - @p __n characters are inserted
     328             :        *  - inserting into the output sequence fails (in this case, badbit
     329             :        *    will be set in the stream's error state)
     330             :        *
     331             :        *  @note  This function is not overloaded on signed char and
     332             :        *         unsigned char.
     333             :       */
     334             :       __ostream_type&
     335             :       write(const char_type* __s, streamsize __n);
     336             :       //@}
     337             : 
     338             :       /**
     339             :        *  @brief  Synchronizing the stream buffer.
     340             :        *  @return  *this
     341             :        *
     342             :        *  If @c rdbuf() is a null pointer, changes nothing.
     343             :        *
     344             :        *  Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
     345             :        *  sets badbit.
     346             :       */
     347             :       __ostream_type&
     348             :       flush();
     349             : 
     350             :       /**
     351             :        *  @brief  Getting the current write position.
     352             :        *  @return  A file position object.
     353             :        *
     354             :        *  If @c fail() is not false, returns @c pos_type(-1) to indicate
     355             :        *  failure.  Otherwise returns @c rdbuf()->pubseekoff(0,cur,out).
     356             :       */
     357             :       pos_type
     358             :       tellp();
     359             : 
     360             :       /**
     361             :        *  @brief  Changing the current write position.
     362             :        *  @param  __pos  A file position object.
     363             :        *  @return  *this
     364             :        *
     365             :        *  If @c fail() is not true, calls @c rdbuf()->pubseekpos(pos).  If
     366             :        *  that function fails, sets failbit.
     367             :       */
     368             :       __ostream_type&
     369             :       seekp(pos_type);
     370             : 
     371             :       /**
     372             :        *  @brief  Changing the current write position.
     373             :        *  @param  __off  A file offset object.
     374             :        *  @param  __dir  The direction in which to seek.
     375             :        *  @return  *this
     376             :        *
     377             :        *  If @c fail() is not true, calls @c rdbuf()->pubseekoff(off,dir).
     378             :        *  If that function fails, sets failbit.
     379             :       */
     380             :        __ostream_type&
     381             :       seekp(off_type, ios_base::seekdir);
     382             : 
     383             :     protected:
     384           0 :       basic_ostream()
     385           0 :       { this->init(0); }
     386             : 
     387             :       template<typename _ValueT>
     388             :         __ostream_type&
     389             :         _M_insert(_ValueT __v);
     390             :     };
     391             : 
     392             :   /**
     393             :    *  @brief  Performs setup work for output streams.
     394             :    *
     395             :    *  Objects of this class are created before all of the standard
     396             :    *  inserters are run.  It is responsible for <em>exception-safe prefix and
     397             :    *  suffix operations</em>.
     398             :   */
     399             :   template <typename _CharT, typename _Traits>
     400             :     class basic_ostream<_CharT, _Traits>::sentry
     401             :     {
     402             :       // Data Members.
     403             :       bool                              _M_ok;
     404             :       basic_ostream<_CharT, _Traits>&         _M_os;
     405             : 
     406             :     public:
     407             :       /**
     408             :        *  @brief  The constructor performs preparatory work.
     409             :        *  @param  __os  The output stream to guard.
     410             :        *
     411             :        *  If the stream state is good (@a __os.good() is true), then if the
     412             :        *  stream is tied to another output stream, @c is.tie()->flush()
     413             :        *  is called to synchronize the output sequences.
     414             :        *
     415             :        *  If the stream state is still good, then the sentry state becomes
     416             :        *  true (@a okay).
     417             :       */
     418             :       explicit
     419             :       sentry(basic_ostream<_CharT, _Traits>& __os);
     420             : 
     421             :       /**
     422             :        *  @brief  Possibly flushes the stream.
     423             :        *
     424             :        *  If @c ios_base::unitbuf is set in @c os.flags(), and
     425             :        *  @c std::uncaught_exception() is true, the sentry destructor calls
     426             :        *  @c flush() on the output stream.
     427             :       */
     428             :       ~sentry()
     429             :       {
     430             :         // XXX MT
     431             :         if (bool(_M_os.flags() & ios_base::unitbuf) && !uncaught_exception())
     432             :           {
     433             :             // Can't call flush directly or else will get into recursive lock.
     434             :             if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
     435             :               _M_os.setstate(ios_base::badbit);
     436             :           }
     437             :       }
     438             : 
     439             :       /**
     440             :        *  @brief  Quick status checking.
     441             :        *  @return  The sentry state.
     442             :        *
     443             :        *  For ease of use, sentries may be converted to booleans.  The
     444             :        *  return value is that of the sentry state (true == okay).
     445             :       */
     446             : #if __cplusplus >= 201103L
     447             :       explicit
     448             : #endif
     449             :       operator bool() const
     450             :       { return _M_ok; }
     451             :     };
     452             : 
     453             :   //@{
     454             :   /**
     455             :    *  @brief  Character inserters
     456             :    *  @param  __out  An output stream.
     457             :    *  @param  __c  A character.
     458             :    *  @return  out
     459             :    *
     460             :    *  Behaves like one of the formatted arithmetic inserters described in
     461             :    *  std::basic_ostream.  After constructing a sentry object with good
     462             :    *  status, this function inserts a single character and any required
     463             :    *  padding (as determined by [22.2.2.2.2]).  @c __out.width(0) is then
     464             :    *  called.
     465             :    *
     466             :    *  If @p __c is of type @c char and the character type of the stream is not
     467             :    *  @c char, the character is widened before insertion.
     468             :   */
     469             :   template<typename _CharT, typename _Traits>
     470             :     inline basic_ostream<_CharT, _Traits>&
     471             :     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     472             :     { return __ostream_insert(__out, &__c, 1); }
     473             : 
     474             :   template<typename _CharT, typename _Traits>
     475             :     inline basic_ostream<_CharT, _Traits>&
     476             :     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     477             :     { return (__out << __out.widen(__c)); }
     478             : 
     479             :   // Specialization
     480             :   template <class _Traits>
     481             :     inline basic_ostream<char, _Traits>&
     482           0 :     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     483           0 :     { return __ostream_insert(__out, &__c, 1); }
     484             : 
     485             :   // Signed and unsigned
     486             :   template<class _Traits>
     487             :     inline basic_ostream<char, _Traits>&
     488             :     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     489             :     { return (__out << static_cast<char>(__c)); }
     490             : 
     491             :   template<class _Traits>
     492             :     inline basic_ostream<char, _Traits>&
     493             :     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     494             :     { return (__out << static_cast<char>(__c)); }
     495             :   //@}
     496             : 
     497             :   //@{
     498             :   /**
     499             :    *  @brief  String inserters
     500             :    *  @param  __out  An output stream.
     501             :    *  @param  __s  A character string.
     502             :    *  @return  out
     503             :    *  @pre  @p __s must be a non-NULL pointer
     504             :    *
     505             :    *  Behaves like one of the formatted arithmetic inserters described in
     506             :    *  std::basic_ostream.  After constructing a sentry object with good
     507             :    *  status, this function inserts @c traits::length(__s) characters starting
     508             :    *  at @p __s, widened if necessary, followed by any required padding (as
     509             :    *  determined by [22.2.2.2.2]).  @c __out.width(0) is then called.
     510             :   */
     511             :   template<typename _CharT, typename _Traits>
     512             :     inline basic_ostream<_CharT, _Traits>&
     513             :     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     514             :     {
     515             :       if (!__s)
     516             :         __out.setstate(ios_base::badbit);
     517             :       else
     518             :         __ostream_insert(__out, __s,
     519             :                          static_cast<streamsize>(_Traits::length(__s)));
     520             :       return __out;
     521             :     }
     522             : 
     523             :   template<typename _CharT, typename _Traits>
     524             :     basic_ostream<_CharT, _Traits> &
     525             :     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);
     526             : 
     527             :   // Partial specializations
     528             :   template<class _Traits>
     529             :     inline basic_ostream<char, _Traits>&
     530           0 :     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     531             :     {
     532           0 :       if (!__s)
     533           0 :         __out.setstate(ios_base::badbit);
     534             :       else
     535           0 :         __ostream_insert(__out, __s,
     536           0 :                          static_cast<streamsize>(_Traits::length(__s)));
     537           0 :       return __out;
     538             :     }
     539             : 
     540             :   // Signed and unsigned
     541             :   template<class _Traits>
     542             :     inline basic_ostream<char, _Traits>&
     543             :     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     544             :     { return (__out << reinterpret_cast<const char*>(__s)); }
     545             : 
     546             :   template<class _Traits>
     547             :     inline basic_ostream<char, _Traits> &
     548             :     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     549             :     { return (__out << reinterpret_cast<const char*>(__s)); }
     550             :   //@}
     551             : 
     552             :   // Standard basic_ostream manipulators
     553             : 
     554             :   /**
     555             :    *  @brief  Write a newline and flush the stream.
     556             :    *
     557             :    *  This manipulator is often mistakenly used when a simple newline is
     558             :    *  desired, leading to poor buffering performance.  See
     559             :    *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html
     560             :    *  for more on this subject.
     561             :   */
     562             :   template<typename _CharT, typename _Traits>
     563             :     inline basic_ostream<_CharT, _Traits>&
     564           0 :     endl(basic_ostream<_CharT, _Traits>& __os)
     565           0 :     { return flush(__os.put(__os.widen('\n'))); }
     566             : 
     567             :   /**
     568             :    *  @brief  Write a null character into the output sequence.
     569             :    *
     570             :    *  <em>Null character</em> is @c CharT() by definition.  For CharT
     571             :    *  of @c char, this correctly writes the ASCII @c NUL character
     572             :    *  string terminator.
     573             :   */
     574             :   template<typename _CharT, typename _Traits>
     575             :     inline basic_ostream<_CharT, _Traits>&
     576             :     ends(basic_ostream<_CharT, _Traits>& __os)
     577             :     { return __os.put(_CharT()); }
     578             : 
     579             :   /**
     580             :    *  @brief  Flushes the output stream.
     581             :    *
     582             :    *  This manipulator simply calls the stream's @c flush() member function.
     583             :   */
     584             :   template<typename _CharT, typename _Traits>
     585             :     inline basic_ostream<_CharT, _Traits>&
     586           0 :     flush(basic_ostream<_CharT, _Traits>& __os)
     587           0 :     { return __os.flush(); }
     588             : 
     589             : #if __cplusplus >= 201103L
     590             :   /**
     591             :    *  @brief  Generic inserter for rvalue stream
     592             :    *  @param  __os  An input stream.
     593             :    *  @param  __x  A reference to the object being inserted.
     594             :    *  @return  os
     595             :    *
     596             :    *  This is just a forwarding function to allow insertion to
     597             :    *  rvalue streams since they won't bind to the inserter functions
     598             :    *  that take an lvalue reference.
     599             :   */
     600             :   template<typename _CharT, typename _Traits, typename _Tp>
     601             :     inline basic_ostream<_CharT, _Traits>&
     602             :     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     603             :     { return (__os << __x); }
     604             : #endif // C++11
     605             : 
     606             : _GLIBCXX_END_NAMESPACE_VERSION
     607             : } // namespace std
     608             : 
     609             : #include <bits/ostream.tcc>
     610             : 
     611             : #endif  /* _GLIBCXX_OSTREAM */

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