LCOV - code coverage report
Current view: top level - usr/include/c++/9 - istream (source / functions) Hit Total Coverage
Test: ROSE Lines: 4 11 36.4 %
Date: 2022-12-08 13:48:47 Functions: 0 0 -
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          Line data    Source code
       1             : // Input streams -*- C++ -*-
       2             : 
       3             : // Copyright (C) 1997-2019 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             : //
      26             : // ISO C++ 14882: 27.6.1  Input streams
      27             : //
      28             : 
      29             : /** @file include/istream
      30             :  *  This is a Standard C++ Library header.
      31             :  */
      32             : 
      33             : #ifndef _GLIBCXX_ISTREAM
      34             : #define _GLIBCXX_ISTREAM 1
      35             : 
      36             : #pragma GCC system_header
      37             : 
      38             : #include <ios>
      39             : #include <ostream>
      40             : 
      41             : namespace std _GLIBCXX_VISIBILITY(default)
      42             : {
      43             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      44             : 
      45             :   /**
      46             :    *  @brief  Template class basic_istream.
      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 input streams.  It provides text
      54             :    *  formatting of all builtin types, and communicates with any class
      55             :    *  derived from basic_streambuf to do the actual input.
      56             :   */
      57             :   template<typename _CharT, typename _Traits>
      58             :     class basic_istream : virtual public basic_ios<_CharT, _Traits>
      59             :     {
      60             :     public:
      61             :       // Types (inherited from basic_ios (27.4.4)):
      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_istream<_CharT, _Traits>              __istream_type;
      72             :       typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
      73             :                                                         __num_get_type;
      74             :       typedef ctype<_CharT>                               __ctype_type;
      75             : 
      76             :     protected:
      77             :       // Data Members:
      78             :       /**
      79             :        *  The number of characters extracted in the previous unformatted
      80             :        *  function; see gcount().
      81             :       */
      82             :       streamsize                _M_gcount;
      83             : 
      84             :     public:
      85             :       /**
      86             :        *  @brief  Base constructor.
      87             :        *
      88             :        *  This ctor is almost never called by the user directly, rather from
      89             :        *  derived classes' initialization lists, which pass a pointer to
      90             :        *  their own stream buffer.
      91             :       */
      92             :       explicit
      93             :       basic_istream(__streambuf_type* __sb)
      94             :       : _M_gcount(streamsize(0))
      95             :       { this->init(__sb); }
      96             : 
      97             :       /**
      98             :        *  @brief  Base destructor.
      99             :        *
     100             :        *  This does very little apart from providing a virtual base dtor.
     101             :       */
     102             :       virtual
     103             :       ~basic_istream()
     104             :       { _M_gcount = streamsize(0); }
     105             : 
     106             :       /// Safe prefix/suffix operations.
     107             :       class sentry;
     108             :       friend class sentry;
     109             : 
     110             :       ///@{
     111             :       /**
     112             :        *  @brief  Interface for manipulators.
     113             :        *
     114             :        *  Manipulators such as @c std::ws and @c std::dec use these
     115             :        *  functions in constructs like
     116             :        *  <code>std::cin >> std::ws</code>.
     117             :        *  For more information, see the iomanip header.
     118             :       */
     119             :       __istream_type&
     120             :       operator>>(__istream_type& (*__pf)(__istream_type&))
     121             :       { return __pf(*this); }
     122             : 
     123             :       __istream_type&
     124             :       operator>>(__ios_type& (*__pf)(__ios_type&))
     125             :       {
     126             :         __pf(*this);
     127             :         return *this;
     128             :       }
     129             : 
     130             :       __istream_type&
     131         133 :       operator>>(ios_base& (*__pf)(ios_base&))
     132             :       {
     133         133 :         __pf(*this);
     134           0 :         return *this;
     135             :       }
     136             :       ///@}
     137             : 
     138             :       ///@{
     139             :       /**
     140             :        *  @name Extractors
     141             :        *
     142             :        *  All the @c operator>> functions (aka <em>formatted input
     143             :        *  functions</em>) have some common behavior.  Each starts by
     144             :        *  constructing a temporary object of type std::basic_istream::sentry
     145             :        *  with the second argument (noskipws) set to false.  This has several
     146             :        *  effects, concluding with the setting of a status flag; see the
     147             :        *  sentry documentation for more.
     148             :        *
     149             :        *  If the sentry status is good, the function tries to extract
     150             :        *  whatever data is appropriate for the type of the argument.
     151             :        *
     152             :        *  If an exception is thrown during extraction, ios_base::badbit
     153             :        *  will be turned on in the stream's error state (without causing an
     154             :        *  ios_base::failure to be thrown) and the original exception will
     155             :        *  be rethrown if badbit is set in the exceptions mask.
     156             :       */
     157             : 
     158             :       ///@{
     159             :       /**
     160             :        *  @brief  Integer arithmetic extractors
     161             :        *  @param  __n A variable of builtin integral type.
     162             :        *  @return  @c *this if successful
     163             :        *
     164             :        *  These functions use the stream's current locale (specifically, the
     165             :        *  @c num_get facet) to parse the input data.
     166             :       */
     167             :       __istream_type&
     168             :       operator>>(bool& __n)
     169             :       { return _M_extract(__n); }
     170             : 
     171             :       __istream_type&
     172             :       operator>>(short& __n);
     173             : 
     174             :       __istream_type&
     175             :       operator>>(unsigned short& __n)
     176             :       { return _M_extract(__n); }
     177             : 
     178             :       __istream_type&
     179             :       operator>>(int& __n);
     180             : 
     181             :       __istream_type&
     182             :       operator>>(unsigned int& __n)
     183             :       { return _M_extract(__n); }
     184             : 
     185             :       __istream_type&
     186           0 :       operator>>(long& __n)
     187           0 :       { return _M_extract(__n); }
     188             : 
     189             :       __istream_type&
     190         133 :       operator>>(unsigned long& __n)
     191         133 :       { return _M_extract(__n); }
     192             : 
     193             : #ifdef _GLIBCXX_USE_LONG_LONG
     194             :       __istream_type&
     195             :       operator>>(long long& __n)
     196             :       { return _M_extract(__n); }
     197             : 
     198             :       __istream_type&
     199             :       operator>>(unsigned long long& __n)
     200             :       { return _M_extract(__n); }
     201             : #endif
     202             :       ///@}
     203             : 
     204             :       ///@{
     205             :       /**
     206             :        *  @brief  Floating point arithmetic extractors
     207             :        *  @param  __f A variable of builtin floating point type.
     208             :        *  @return  @c *this if successful
     209             :        *
     210             :        *  These functions use the stream's current locale (specifically, the
     211             :        *  @c num_get facet) to parse the input data.
     212             :       */
     213             :       __istream_type&
     214           0 :       operator>>(float& __f)
     215           0 :       { return _M_extract(__f); }
     216             : 
     217             :       __istream_type&
     218           0 :       operator>>(double& __f)
     219           0 :       { return _M_extract(__f); }
     220             : 
     221             :       __istream_type&
     222             :       operator>>(long double& __f)
     223             :       { return _M_extract(__f); }
     224             :       ///@}
     225             : 
     226             :       /**
     227             :        *  @brief  Basic arithmetic extractors
     228             :        *  @param  __p A variable of pointer type.
     229             :        *  @return  @c *this if successful
     230             :        *
     231             :        *  These functions use the stream's current locale (specifically, the
     232             :        *  @c num_get facet) to parse the input data.
     233             :       */
     234             :       __istream_type&
     235             :       operator>>(void*& __p)
     236             :       { return _M_extract(__p); }
     237             : 
     238             :       /**
     239             :        *  @brief  Extracting into another streambuf.
     240             :        *  @param  __sb  A pointer to a streambuf
     241             :        *
     242             :        *  This function behaves like one of the basic arithmetic extractors,
     243             :        *  in that it also constructs a sentry object and has the same error
     244             :        *  handling behavior.
     245             :        *
     246             :        *  If @p __sb is NULL, the stream will set failbit in its error state.
     247             :        *
     248             :        *  Characters are extracted from this stream and inserted into the
     249             :        *  @p __sb streambuf until one of the following occurs:
     250             :        *
     251             :        *  - the input stream reaches end-of-file,
     252             :        *  - insertion into the output buffer fails (in this case, the
     253             :        *    character that would have been inserted is not extracted), or
     254             :        *  - an exception occurs (and in this case is caught)
     255             :        *
     256             :        *  If the function inserts no characters, failbit is set.
     257             :       */
     258             :       __istream_type&
     259             :       operator>>(__streambuf_type* __sb);
     260             :       ///@}
     261             : 
     262             :       // [27.6.1.3] unformatted input
     263             :       /**
     264             :        *  @brief  Character counting
     265             :        *  @return  The number of characters extracted by the previous
     266             :        *           unformatted input function dispatched for this stream.
     267             :       */
     268             :       streamsize
     269             :       gcount() const
     270             :       { return _M_gcount; }
     271             : 
     272             :       ///@{
     273             :       /**
     274             :        *  @name Unformatted Input Functions
     275             :        *
     276             :        *  All the unformatted input functions have some common behavior.
     277             :        *  Each starts by constructing a temporary object of type
     278             :        *  std::basic_istream::sentry with the second argument (noskipws)
     279             :        *  set to true.  This has several effects, concluding with the
     280             :        *  setting of a status flag; see the sentry documentation for more.
     281             :        *
     282             :        *  If the sentry status is good, the function tries to extract
     283             :        *  whatever data is appropriate for the type of the argument.
     284             :        *
     285             :        *  The number of characters extracted is stored for later retrieval
     286             :        *  by gcount().
     287             :        *
     288             :        *  If an exception is thrown during extraction, ios_base::badbit
     289             :        *  will be turned on in the stream's error state (without causing an
     290             :        *  ios_base::failure to be thrown) and the original exception will
     291             :        *  be rethrown if badbit is set in the exceptions mask.
     292             :       */
     293             : 
     294             :       /**
     295             :        *  @brief  Simple extraction.
     296             :        *  @return  A character, or eof().
     297             :        *
     298             :        *  Tries to extract a character.  If none are available, sets failbit
     299             :        *  and returns traits::eof().
     300             :       */
     301             :       int_type
     302             :       get();
     303             : 
     304             :       /**
     305             :        *  @brief  Simple extraction.
     306             :        *  @param  __c  The character in which to store data.
     307             :        *  @return  *this
     308             :        *
     309             :        *  Tries to extract a character and store it in @a __c.  If none are
     310             :        *  available, sets failbit and returns traits::eof().
     311             :        *
     312             :        *  @note  This function is not overloaded on signed char and
     313             :        *         unsigned char.
     314             :       */
     315             :       __istream_type&
     316             :       get(char_type& __c);
     317             : 
     318             :       /**
     319             :        *  @brief  Simple multiple-character extraction.
     320             :        *  @param  __s  Pointer to an array.
     321             :        *  @param  __n  Maximum number of characters to store in @a __s.
     322             :        *  @param  __delim  A "stop" character.
     323             :        *  @return  *this
     324             :        *
     325             :        *  Characters are extracted and stored into @a __s until one of the
     326             :        *  following happens:
     327             :        *
     328             :        *  - @c __n-1 characters are stored
     329             :        *  - the input sequence reaches EOF
     330             :        *  - the next character equals @a __delim, in which case the character
     331             :        *    is not extracted
     332             :        *
     333             :        * If no characters are stored, failbit is set in the stream's error
     334             :        * state.
     335             :        *
     336             :        * In any case, a null character is stored into the next location in
     337             :        * the array.
     338             :        *
     339             :        *  @note  This function is not overloaded on signed char and
     340             :        *         unsigned char.
     341             :       */
     342             :       __istream_type&
     343             :       get(char_type* __s, streamsize __n, char_type __delim);
     344             : 
     345             :       /**
     346             :        *  @brief  Simple multiple-character extraction.
     347             :        *  @param  __s  Pointer to an array.
     348             :        *  @param  __n  Maximum number of characters to store in @a s.
     349             :        *  @return  *this
     350             :        *
     351             :        *  Returns @c get(__s,__n,widen(&apos;\\n&apos;)).
     352             :       */
     353             :       __istream_type&
     354             :       get(char_type* __s, streamsize __n)
     355             :       { return this->get(__s, __n, this->widen('\n')); }
     356             : 
     357             :       /**
     358             :        *  @brief  Extraction into another streambuf.
     359             :        *  @param  __sb  A streambuf in which to store data.
     360             :        *  @param  __delim  A "stop" character.
     361             :        *  @return  *this
     362             :        *
     363             :        *  Characters are extracted and inserted into @a __sb until one of the
     364             :        *  following happens:
     365             :        *
     366             :        *  - the input sequence reaches EOF
     367             :        *  - insertion into the output buffer fails (in this case, the
     368             :        *    character that would have been inserted is not extracted)
     369             :        *  - the next character equals @a __delim (in this case, the character
     370             :        *    is not extracted)
     371             :        *  - an exception occurs (and in this case is caught)
     372             :        *
     373             :        * If no characters are stored, failbit is set in the stream's error
     374             :        * state.
     375             :       */
     376             :       __istream_type&
     377             :       get(__streambuf_type& __sb, char_type __delim);
     378             : 
     379             :       /**
     380             :        *  @brief  Extraction into another streambuf.
     381             :        *  @param  __sb  A streambuf in which to store data.
     382             :        *  @return  *this
     383             :        *
     384             :        *  Returns @c get(__sb,widen(&apos;\\n&apos;)).
     385             :       */
     386             :       __istream_type&
     387             :       get(__streambuf_type& __sb)
     388             :       { return this->get(__sb, this->widen('\n')); }
     389             : 
     390             :       /**
     391             :        *  @brief  String extraction.
     392             :        *  @param  __s  A character array in which to store the data.
     393             :        *  @param  __n  Maximum number of characters to extract.
     394             :        *  @param  __delim  A "stop" character.
     395             :        *  @return  *this
     396             :        *
     397             :        *  Extracts and stores characters into @a __s until one of the
     398             :        *  following happens.  Note that these criteria are required to be
     399             :        *  tested in the order listed here, to allow an input line to exactly
     400             :        *  fill the @a __s array without setting failbit.
     401             :        *
     402             :        *  -# the input sequence reaches end-of-file, in which case eofbit
     403             :        *     is set in the stream error state
     404             :        *  -# the next character equals @c __delim, in which case the character
     405             :        *     is extracted (and therefore counted in @c gcount()) but not stored
     406             :        *  -# @c __n-1 characters are stored, in which case failbit is set
     407             :        *     in the stream error state
     408             :        *
     409             :        *  If no characters are extracted, failbit is set.  (An empty line of
     410             :        *  input should therefore not cause failbit to be set.)
     411             :        *
     412             :        *  In any case, a null character is stored in the next location in
     413             :        *  the array.
     414             :       */
     415             :       __istream_type&
     416             :       getline(char_type* __s, streamsize __n, char_type __delim);
     417             : 
     418             :       /**
     419             :        *  @brief  String extraction.
     420             :        *  @param  __s  A character array in which to store the data.
     421             :        *  @param  __n  Maximum number of characters to extract.
     422             :        *  @return  *this
     423             :        *
     424             :        *  Returns @c getline(__s,__n,widen(&apos;\\n&apos;)).
     425             :       */
     426             :       __istream_type&
     427             :       getline(char_type* __s, streamsize __n)
     428             :       { return this->getline(__s, __n, this->widen('\n')); }
     429             : 
     430             :       /**
     431             :        *  @brief  Discarding characters
     432             :        *  @param  __n  Number of characters to discard.
     433             :        *  @param  __delim  A "stop" character.
     434             :        *  @return  *this
     435             :        *
     436             :        *  Extracts characters and throws them away until one of the
     437             :        *  following happens:
     438             :        *  - if @a __n @c != @c std::numeric_limits<int>::max(), @a __n
     439             :        *    characters are extracted
     440             :        *  - the input sequence reaches end-of-file
     441             :        *  - the next character equals @a __delim (in this case, the character
     442             :        *    is extracted); note that this condition will never occur if
     443             :        *    @a __delim equals @c traits::eof().
     444             :        *
     445             :        *  NB: Provide three overloads, instead of the single function
     446             :        *  (with defaults) mandated by the Standard: this leads to a
     447             :        *  better performing implementation, while still conforming to
     448             :        *  the Standard.
     449             :       */
     450             :       __istream_type&
     451             :       ignore(streamsize __n, int_type __delim);
     452             : 
     453             :       __istream_type&
     454             :       ignore(streamsize __n);
     455             : 
     456             :       __istream_type&
     457             :       ignore();
     458             : 
     459             :       /**
     460             :        *  @brief  Looking ahead in the stream
     461             :        *  @return  The next character, or eof().
     462             :        *
     463             :        *  If, after constructing the sentry object, @c good() is false,
     464             :        *  returns @c traits::eof().  Otherwise reads but does not extract
     465             :        *  the next input character.
     466             :       */
     467             :       int_type
     468             :       peek();
     469             : 
     470             :       /**
     471             :        *  @brief  Extraction without delimiters.
     472             :        *  @param  __s  A character array.
     473             :        *  @param  __n  Maximum number of characters to store.
     474             :        *  @return  *this
     475             :        *
     476             :        *  If the stream state is @c good(), extracts characters and stores
     477             :        *  them into @a __s until one of the following happens:
     478             :        *  - @a __n characters are stored
     479             :        *  - the input sequence reaches end-of-file, in which case the error
     480             :        *    state is set to @c failbit|eofbit.
     481             :        *
     482             :        *  @note  This function is not overloaded on signed char and
     483             :        *         unsigned char.
     484             :       */
     485             :       __istream_type&
     486             :       read(char_type* __s, streamsize __n);
     487             : 
     488             :       /**
     489             :        *  @brief  Extraction until the buffer is exhausted, but no more.
     490             :        *  @param  __s  A character array.
     491             :        *  @param  __n  Maximum number of characters to store.
     492             :        *  @return  The number of characters extracted.
     493             :        *
     494             :        *  Extracts characters and stores them into @a __s depending on the
     495             :        *  number of characters remaining in the streambuf's buffer,
     496             :        *  @c rdbuf()->in_avail(), called @c A here:
     497             :        *  - if @c A @c == @c -1, sets eofbit and extracts no characters
     498             :        *  - if @c A @c == @c 0, extracts no characters
     499             :        *  - if @c A @c > @c 0, extracts @c min(A,n)
     500             :        *
     501             :        *  The goal is to empty the current buffer, and to not request any
     502             :        *  more from the external input sequence controlled by the streambuf.
     503             :       */
     504             :       streamsize
     505             :       readsome(char_type* __s, streamsize __n);
     506             : 
     507             :       /**
     508             :        *  @brief  Unextracting a single character.
     509             :        *  @param  __c  The character to push back into the input stream.
     510             :        *  @return  *this
     511             :        *
     512             :        *  If @c rdbuf() is not null, calls @c rdbuf()->sputbackc(c).
     513             :        *
     514             :        *  If @c rdbuf() is null or if @c sputbackc() fails, sets badbit in
     515             :        *  the error state.
     516             :        *
     517             :        *  @note  This function first clears eofbit.  Since no characters
     518             :        *         are extracted, the next call to @c gcount() will return 0,
     519             :        *         as required by DR 60.
     520             :       */
     521             :       __istream_type&
     522             :       putback(char_type __c);
     523             : 
     524             :       /**
     525             :        *  @brief  Unextracting the previous character.
     526             :        *  @return  *this
     527             :        *
     528             :        *  If @c rdbuf() is not null, calls @c rdbuf()->sungetc(c).
     529             :        *
     530             :        *  If @c rdbuf() is null or if @c sungetc() fails, sets badbit in
     531             :        *  the error state.
     532             :        *
     533             :        *  @note  This function first clears eofbit.  Since no characters
     534             :        *         are extracted, the next call to @c gcount() will return 0,
     535             :        *         as required by DR 60.
     536             :       */
     537             :       __istream_type&
     538             :       unget();
     539             : 
     540             :       /**
     541             :        *  @brief  Synchronizing the stream buffer.
     542             :        *  @return  0 on success, -1 on failure
     543             :        *
     544             :        *  If @c rdbuf() is a null pointer, returns -1.
     545             :        *
     546             :        *  Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
     547             :        *  sets badbit and returns -1.
     548             :        *
     549             :        *  Otherwise, returns 0.
     550             :        *
     551             :        *  @note  This function does not count the number of characters
     552             :        *         extracted, if any, and therefore does not affect the next
     553             :        *         call to @c gcount().
     554             :       */
     555             :       int
     556             :       sync();
     557             : 
     558             :       /**
     559             :        *  @brief  Getting the current read position.
     560             :        *  @return  A file position object.
     561             :        *
     562             :        *  If @c fail() is not false, returns @c pos_type(-1) to indicate
     563             :        *  failure.  Otherwise returns @c rdbuf()->pubseekoff(0,cur,in).
     564             :        *
     565             :        *  @note  This function does not count the number of characters
     566             :        *         extracted, if any, and therefore does not affect the next
     567             :        *         call to @c gcount().  At variance with putback, unget and
     568             :        *         seekg, eofbit is not cleared first.
     569             :       */
     570             :       pos_type
     571             :       tellg();
     572             : 
     573             :       /**
     574             :        *  @brief  Changing the current read position.
     575             :        *  @param  __pos  A file position object.
     576             :        *  @return  *this
     577             :        *
     578             :        *  If @c fail() is not true, calls @c rdbuf()->pubseekpos(__pos).  If
     579             :        *  that function fails, sets failbit.
     580             :        *
     581             :        *  @note  This function first clears eofbit.  It does not count the
     582             :        *         number of characters extracted, if any, and therefore does
     583             :        *         not affect the next call to @c gcount().
     584             :       */
     585             :       __istream_type&
     586             :       seekg(pos_type);
     587             : 
     588             :       /**
     589             :        *  @brief  Changing the current read position.
     590             :        *  @param  __off  A file offset object.
     591             :        *  @param  __dir  The direction in which to seek.
     592             :        *  @return  *this
     593             :        *
     594             :        *  If @c fail() is not true, calls @c rdbuf()->pubseekoff(__off,__dir).
     595             :        *  If that function fails, sets failbit.
     596             :        *
     597             :        *  @note  This function first clears eofbit.  It does not count the
     598             :        *         number of characters extracted, if any, and therefore does
     599             :        *         not affect the next call to @c gcount().
     600             :       */
     601             :       __istream_type&
     602             :       seekg(off_type, ios_base::seekdir);
     603             :       ///@}
     604             : 
     605             :     protected:
     606             :       basic_istream()
     607             :       : _M_gcount(streamsize(0))
     608             :       { this->init(0); }
     609             : 
     610             : #if __cplusplus >= 201103L
     611             :       basic_istream(const basic_istream&) = delete;
     612             : 
     613             :       basic_istream(basic_istream&& __rhs)
     614             :       : __ios_type(), _M_gcount(__rhs._M_gcount)
     615             :       {
     616             :         __ios_type::move(__rhs);
     617             :         __rhs._M_gcount = 0;
     618             :       }
     619             : 
     620             :       // 27.7.3.3 Assign/swap
     621             : 
     622             :       basic_istream& operator=(const basic_istream&) = delete;
     623             : 
     624             :       basic_istream&
     625             :       operator=(basic_istream&& __rhs)
     626             :       {
     627             :         swap(__rhs);
     628             :         return *this;
     629             :       }
     630             : 
     631             :       void
     632             :       swap(basic_istream& __rhs)
     633             :       {
     634             :         __ios_type::swap(__rhs);
     635             :         std::swap(_M_gcount, __rhs._M_gcount);
     636             :       }
     637             : #endif
     638             : 
     639             :       template<typename _ValueT>
     640             :         __istream_type&
     641             :         _M_extract(_ValueT& __v);
     642             :     };
     643             : 
     644             :   /// Explicit specialization declarations, defined in src/istream.cc.
     645             :   template<>
     646             :     basic_istream<char>&
     647             :     basic_istream<char>::
     648             :     getline(char_type* __s, streamsize __n, char_type __delim);
     649             : 
     650             :   template<>
     651             :     basic_istream<char>&
     652             :     basic_istream<char>::
     653             :     ignore(streamsize __n);
     654             : 
     655             :   template<>
     656             :     basic_istream<char>&
     657             :     basic_istream<char>::
     658             :     ignore(streamsize __n, int_type __delim);
     659             : 
     660             : #ifdef _GLIBCXX_USE_WCHAR_T
     661             :   template<>
     662             :     basic_istream<wchar_t>&
     663             :     basic_istream<wchar_t>::
     664             :     getline(char_type* __s, streamsize __n, char_type __delim);
     665             : 
     666             :   template<>
     667             :     basic_istream<wchar_t>&
     668             :     basic_istream<wchar_t>::
     669             :     ignore(streamsize __n);
     670             : 
     671             :   template<>
     672             :     basic_istream<wchar_t>&
     673             :     basic_istream<wchar_t>::
     674             :     ignore(streamsize __n, int_type __delim);
     675             : #endif
     676             : 
     677             :   /**
     678             :    *  @brief  Performs setup work for input streams.
     679             :    *
     680             :    *  Objects of this class are created before all of the standard
     681             :    *  extractors are run.  It is responsible for <em>exception-safe
     682             :    *  prefix and suffix operations,</em> although only prefix actions
     683             :    *  are currently required by the standard.
     684             :   */
     685             :   template<typename _CharT, typename _Traits>
     686             :     class basic_istream<_CharT, _Traits>::sentry
     687             :     {
     688             :       // Data Members.
     689             :       bool _M_ok;
     690             : 
     691             :     public:
     692             :       /// Easy access to dependent types.
     693             :       typedef _Traits                                   traits_type;
     694             :       typedef basic_streambuf<_CharT, _Traits>            __streambuf_type;
     695             :       typedef basic_istream<_CharT, _Traits>              __istream_type;
     696             :       typedef typename __istream_type::__ctype_type     __ctype_type;
     697             :       typedef typename _Traits::int_type                __int_type;
     698             : 
     699             :       /**
     700             :        *  @brief  The constructor performs all the work.
     701             :        *  @param  __is  The input stream to guard.
     702             :        *  @param  __noskipws  Whether to consume whitespace or not.
     703             :        *
     704             :        *  If the stream state is good (@a __is.good() is true), then the
     705             :        *  following actions are performed, otherwise the sentry state
     706             :        *  is false (<em>not okay</em>) and failbit is set in the
     707             :        *  stream state.
     708             :        *
     709             :        *  The sentry's preparatory actions are:
     710             :        *
     711             :        *  -# if the stream is tied to an output stream, @c is.tie()->flush()
     712             :        *     is called to synchronize the output sequence
     713             :        *  -# if @a __noskipws is false, and @c ios_base::skipws is set in
     714             :        *     @c is.flags(), the sentry extracts and discards whitespace
     715             :        *     characters from the stream.  The currently imbued locale is
     716             :        *     used to determine whether each character is whitespace.
     717             :        *
     718             :        *  If the stream state is still good, then the sentry state becomes
     719             :        *  true (@a okay).
     720             :       */
     721             :       explicit
     722             :       sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
     723             : 
     724             :       /**
     725             :        *  @brief  Quick status checking.
     726             :        *  @return  The sentry state.
     727             :        *
     728             :        *  For ease of use, sentries may be converted to booleans.  The
     729             :        *  return value is that of the sentry state (true == okay).
     730             :       */
     731             : #if __cplusplus >= 201103L
     732             :       explicit
     733             : #endif
     734             :       operator bool() const
     735             :       { return _M_ok; }
     736             :     };
     737             : 
     738             :   ///@{
     739             :   /**
     740             :    *  @brief  Character extractors
     741             :    *  @param  __in  An input stream.
     742             :    *  @param  __c  A character reference.
     743             :    *  @return  in
     744             :    *
     745             :    *  Behaves like one of the formatted arithmetic extractors described in
     746             :    *  std::basic_istream.  After constructing a sentry object with good
     747             :    *  status, this function extracts a character (if one is available) and
     748             :    *  stores it in @a __c.  Otherwise, sets failbit in the input stream.
     749             :   */
     750             :   template<typename _CharT, typename _Traits>
     751             :     basic_istream<_CharT, _Traits>&
     752             :     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c);
     753             : 
     754             :   template<class _Traits>
     755             :     inline basic_istream<char, _Traits>&
     756             :     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
     757             :     { return (__in >> reinterpret_cast<char&>(__c)); }
     758             : 
     759             :   template<class _Traits>
     760             :     inline basic_istream<char, _Traits>&
     761             :     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
     762             :     { return (__in >> reinterpret_cast<char&>(__c)); }
     763             :   ///@}
     764             : 
     765             :   ///@{
     766             :   /**
     767             :    *  @brief  Character string extractors
     768             :    *  @param  __in  An input stream.
     769             :    *  @param  __s  A pointer to a character array.
     770             :    *  @return  __in
     771             :    *
     772             :    *  Behaves like one of the formatted arithmetic extractors described in
     773             :    *  std::basic_istream.  After constructing a sentry object with good
     774             :    *  status, this function extracts up to @c n characters and stores them
     775             :    *  into the array starting at @a __s.  @c n is defined as:
     776             :    *
     777             :    *  - if @c width() is greater than zero, @c n is width() otherwise
     778             :    *  - @c n is <em>the number of elements of the largest array of *
     779             :    *  - @c char_type that can store a terminating @c eos.</em>
     780             :    *  - [27.6.1.2.3]/6
     781             :    *
     782             :    *  Characters are extracted and stored until one of the following happens:
     783             :    *  - @c n-1 characters are stored
     784             :    *  - EOF is reached
     785             :    *  - the next character is whitespace according to the current locale
     786             :    *  - the next character is a null byte (i.e., @c charT() )
     787             :    *
     788             :    *  @c width(0) is then called for the input stream.
     789             :    *
     790             :    *  If no characters are extracted, sets failbit.
     791             :   */
     792             :   template<typename _CharT, typename _Traits>
     793             :     basic_istream<_CharT, _Traits>&
     794             :     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s);
     795             : 
     796             :   // Explicit specialization declaration, defined in src/istream.cc.
     797             :   template<>
     798             :     basic_istream<char>&
     799             :     operator>>(basic_istream<char>& __in, char* __s);
     800             : 
     801             :   template<class _Traits>
     802             :     inline basic_istream<char, _Traits>&
     803             :     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
     804             :     { return (__in >> reinterpret_cast<char*>(__s)); }
     805             : 
     806             :   template<class _Traits>
     807             :     inline basic_istream<char, _Traits>&
     808             :     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
     809             :     { return (__in >> reinterpret_cast<char*>(__s)); }
     810             :   ///@}
     811             : 
     812             :   /**
     813             :    *  @brief  Template class basic_iostream
     814             :    *  @ingroup io
     815             :    *
     816             :    *  @tparam _CharT  Type of character stream.
     817             :    *  @tparam _Traits  Traits for character type, defaults to
     818             :    *                   char_traits<_CharT>.
     819             :    *
     820             :    *  This class multiply inherits from the input and output stream classes
     821             :    *  simply to provide a single interface.
     822             :   */
     823             :   template<typename _CharT, typename _Traits>
     824             :     class basic_iostream
     825             :     : public basic_istream<_CharT, _Traits>,
     826             :       public basic_ostream<_CharT, _Traits>
     827             :     {
     828             :     public:
     829             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     830             :       // 271. basic_iostream missing typedefs
     831             :       // Types (inherited):
     832             :       typedef _CharT                                    char_type;
     833             :       typedef typename _Traits::int_type                int_type;
     834             :       typedef typename _Traits::pos_type                pos_type;
     835             :       typedef typename _Traits::off_type                off_type;
     836             :       typedef _Traits                                   traits_type;
     837             : 
     838             :       // Non-standard Types:
     839             :       typedef basic_istream<_CharT, _Traits>              __istream_type;
     840             :       typedef basic_ostream<_CharT, _Traits>              __ostream_type;
     841             : 
     842             :       /**
     843             :        *  @brief  Constructor does nothing.
     844             :        *
     845             :        *  Both of the parent classes are initialized with the same
     846             :        *  streambuf pointer passed to this constructor.
     847             :       */
     848             :       explicit
     849             :       basic_iostream(basic_streambuf<_CharT, _Traits>* __sb)
     850             :       : __istream_type(__sb), __ostream_type(__sb) { }
     851             : 
     852             :       /**
     853             :        *  @brief  Destructor does nothing.
     854             :       */
     855             :       virtual
     856             :       ~basic_iostream() { }
     857             : 
     858             :     protected:
     859             :       basic_iostream()
     860             :       : __istream_type(), __ostream_type() { }
     861             : 
     862             : #if __cplusplus >= 201103L
     863             :       basic_iostream(const basic_iostream&) = delete;
     864             : 
     865             :       basic_iostream(basic_iostream&& __rhs)
     866             :       : __istream_type(std::move(__rhs)), __ostream_type(*this)
     867             :       { }
     868             : 
     869             :       // 27.7.3.3 Assign/swap
     870             : 
     871             :       basic_iostream& operator=(const basic_iostream&) = delete;
     872             : 
     873             :       basic_iostream&
     874             :       operator=(basic_iostream&& __rhs)
     875             :       {
     876             :         swap(__rhs);
     877             :         return *this;
     878             :       }
     879             : 
     880             :       void
     881             :       swap(basic_iostream& __rhs)
     882             :       { __istream_type::swap(__rhs); }
     883             : #endif
     884             :     };
     885             : 
     886             :   /**
     887             :    *  @brief  Quick and easy way to eat whitespace
     888             :    *
     889             :    *  This manipulator extracts whitespace characters, stopping when the
     890             :    *  next character is non-whitespace, or when the input sequence is empty.
     891             :    *  If the sequence is empty, @c eofbit is set in the stream, but not
     892             :    *  @c failbit.
     893             :    *
     894             :    *  The current locale is used to distinguish whitespace characters.
     895             :    *
     896             :    *  Example:
     897             :    *  @code
     898             :    *     MyClass   mc;
     899             :    *
     900             :    *     std::cin >> std::ws >> mc;
     901             :    *  @endcode
     902             :    *  will skip leading whitespace before calling operator>> on cin and your
     903             :    *  object.  Note that the same effect can be achieved by creating a
     904             :    *  std::basic_istream::sentry inside your definition of operator>>.
     905             :   */
     906             :   template<typename _CharT, typename _Traits>
     907             :     basic_istream<_CharT, _Traits>&
     908             :     ws(basic_istream<_CharT, _Traits>& __is);
     909             : 
     910             : #if __cplusplus >= 201103L
     911             :   template<typename _Ch, typename _Up>
     912             :     basic_istream<_Ch, _Up>&
     913             :     __is_convertible_to_basic_istream_test(basic_istream<_Ch, _Up>*);
     914             : 
     915             :   template<typename _Tp, typename = void>
     916             :     struct __is_convertible_to_basic_istream_impl
     917             :     {
     918             :       using __istream_type = void;
     919             :     };
     920             : 
     921             :   template<typename _Tp>
     922             :     using __do_is_convertible_to_basic_istream_impl =
     923             :     decltype(__is_convertible_to_basic_istream_test
     924             :              (declval<typename remove_reference<_Tp>::type*>()));
     925             : 
     926             :   template<typename _Tp>
     927             :     struct __is_convertible_to_basic_istream_impl
     928             :     <_Tp,
     929             :      __void_t<__do_is_convertible_to_basic_istream_impl<_Tp>>>
     930             :     {
     931             :       using __istream_type =
     932             :         __do_is_convertible_to_basic_istream_impl<_Tp>;
     933             :     };
     934             : 
     935             :   template<typename _Tp>
     936             :     struct __is_convertible_to_basic_istream
     937             :     : __is_convertible_to_basic_istream_impl<_Tp>
     938             :     {
     939             :     public:
     940             :       using type = __not_<is_void<
     941             :         typename __is_convertible_to_basic_istream_impl<_Tp>::__istream_type>>;
     942             :       constexpr static bool value = type::value;
     943             :     };
     944             : 
     945             :   template<typename _Istream, typename _Tp, typename = void>
     946             :     struct __is_extractable : false_type {};
     947             : 
     948             :   template<typename _Istream, typename _Tp>
     949             :     struct __is_extractable<_Istream, _Tp,
     950             :                             __void_t<decltype(declval<_Istream&>()
     951             :                                               >> declval<_Tp>())>>
     952             :     : true_type {};
     953             : 
     954             :   template<typename _Istream>
     955             :     using __rvalue_istream_type =
     956             :       typename __is_convertible_to_basic_istream<
     957             :         _Istream>::__istream_type;
     958             : 
     959             :   // [27.7.1.6] Rvalue stream extraction
     960             :   // _GLIBCXX_RESOLVE_LIB_DEFECTS
     961             :   // 2328. Rvalue stream extraction should use perfect forwarding
     962             :   /**
     963             :    *  @brief  Generic extractor for rvalue stream
     964             :    *  @param  __is  An input stream.
     965             :    *  @param  __x  A reference to the extraction target.
     966             :    *  @return  is
     967             :    *
     968             :    *  This is just a forwarding function to allow extraction from
     969             :    *  rvalue streams since they won't bind to the extractor functions
     970             :    *  that take an lvalue reference.
     971             :   */
     972             :   template<typename _Istream, typename _Tp>
     973             :     inline
     974             :     typename enable_if<__and_<__not_<is_lvalue_reference<_Istream>>,
     975             :                               __is_convertible_to_basic_istream<_Istream>,
     976             :                               __is_extractable<
     977             :                                 __rvalue_istream_type<_Istream>,
     978             :                                 _Tp&&>>::value,
     979             :                        __rvalue_istream_type<_Istream>>::type
     980             :     operator>>(_Istream&& __is, _Tp&& __x)
     981             :     {
     982             :       __rvalue_istream_type<_Istream> __ret_is = __is;
     983             :       __ret_is >> std::forward<_Tp>(__x);
     984             :       return __ret_is;
     985             :     }
     986             : #endif // C++11
     987             : 
     988             : _GLIBCXX_END_NAMESPACE_VERSION
     989             : } // namespace
     990             : 
     991             : #include <bits/istream.tcc>
     992             : 
     993             : #endif  /* _GLIBCXX_ISTREAM */

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