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// Input streams -*- C++ -*-

// Copyright (C) 1997-2015 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 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// 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.

// 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

// .

//

// ISO C++ 14882: 27.6.1  Input streams

//

/** @file include/istream

 *  This is a Standard C++ Library header.

 */

#ifndef _GLIBCXX_ISTREAM

#define _GLIBCXX_ISTREAM 1

#pragma GCC system_header

#include 

#include 

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**

   *  @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

   *  derived from basic_streambuf to do the actual input.

  */

  template

    class basic_istream : virtual public basic_ios<_CharT, _Traits>

    {

    public:

      // Types (inherited from basic_ios (27.4.4)):

      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;

      // 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> >

 							__num_get_type;

      typedef ctype<_CharT>	      			__ctype_type;

    protected:

      // Data Members:

      /**

       *  The number of characters extracted in the previous unformatted

       *  function; see gcount().

      */

      streamsize 		_M_gcount;

    public:

      /**

       *  @brief  Base constructor.

       *

       *  This ctor is almost never called by the user directly, rather from

       *  derived classes' initialization lists, which pass a pointer to

       *  their own stream buffer.

      */

      explicit

      basic_istream(__streambuf_type* __sb)

      : _M_gcount(streamsize(0))

      { this->init(__sb); }

      /**

       *  @brief  Base destructor.

       *

       *  This does very little apart from providing a virtual base dtor.

      */

      virtual

      ~basic_istream()

      { _M_gcount = streamsize(0); }

      /// Safe prefix/suffix operations.

      class sentry;

      friend class sentry;

      //@{

      /**

       *  @brief  Interface for manipulators.

       *

       *  Manipulators 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.

      */

      __istream_type&

      operator>>(__istream_type& (*__pf)(__istream_type&))

      { return __pf(*this); }

      __istream_type&

      operator>>(__ios_type& (*__pf)(__ios_type&))

      {

	__pf(*this);

	return *this;

      }

      __istream_type&

      operator>>(ios_base& (*__pf)(ios_base&))

      {

	__pf(*this);

	return *this;

      }

      //@}

      //@{

      /**

       *  @name Extractors

       *

       *  All the @c operator>> functions (aka formatted input

       *  functions) have some common behavior.  Each starts by

       *  constructing a temporary object of type std::basic_istream::sentry

       *  with the second argument (noskipws) set to false.  This has several

       *  effects, concluding with the setting of a status flag; see the

       *  sentry documentation for more.

       *

       *  If the sentry status is good, the function tries to extract

       *  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.

      */

      //@{

      /**

       *  @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&

      operator>>(bool& __n)

      { return _M_extract(__n); }

      __istream_type&

      operator>>(short& __n);

      __istream_type&

      operator>>(unsigned short& __n)

      { return _M_extract(__n); }

      __istream_type&

      operator>>(int& __n);

      __istream_type&

      operator>>(unsigned int& __n)

      { return _M_extract(__n); }

      __istream_type&

      operator>>(long& __n)

      { return _M_extract(__n); }

      __istream_type&

      operator>>(unsigned long& __n)

      { return _M_extract(__n); }

#ifdef _GLIBCXX_USE_LONG_LONG

      __istream_type&

      operator>>(long long& __n)

      { return _M_extract(__n); }

      __istream_type&

      operator>>(unsigned long long& __n)

      { return _M_extract(__n); }

#endif

      //@}

      //@{

      /**

       *  @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&

      operator>>(double& __f)

      { return _M_extract(__f); }

      __istream_type&

      operator>>(long double& __f)

      { return _M_extract(__f); }

      //@}

      /**

       *  @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

       *

       *  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 @p __sb is NULL, the stream will set failbit in its error state.

       *

       *  Characters are extracted from this stream and inserted into the

       *  @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

       *    character that would have been inserted is not extracted), or

       *  - an exception occurs (and in this case is caught)

       *

       *  If the function inserts no characters, failbit is set.

      */

      __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

      { return _M_gcount; }

      //@{

      /**

       *  @name Unformatted Input Functions

       *

       *  All the unformatted input functions have some common behavior.

       *  Each starts by constructing a temporary object of type

       *  std::basic_istream::sentry with the second argument (noskipws)

       *  set to true.  This has several effects, concluding with the

       *  setting of a status flag; see the sentry documentation for more.

       *

       *  If the sentry status is good, the function tries to extract

       *  whatever data is appropriate for the type of the argument.

       *

       *  The number of characters extracted is stored for later retrieval

       *  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.

      */

      /**

       *  @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

      get();

      /**

       *  @brief  Simple extraction.

       *  @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

       *  available, sets failbit and returns traits::eof().

       *

       *  @note  This function is not overloaded on signed char and

       *         unsigned char.

      */

      __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.

       *  @return  *this

       *

       *  Characters are extracted and stored into @a __s until one of the

       *  following happens:

       *

       *  - @c __n-1 characters are stored

       *  - the input sequence reaches EOF

       *  - 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

       * state.

       *

       * In any case, a null character is stored into the next location in

       * the array.

       *

       *  @note  This function is not overloaded on signed char and

       *         unsigned char.

      */

      __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.

       *  @return  *this

       *

       *  Returns @c get(__s,__n,widen('\\n')).

      */

      __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.

       *  @return  *this

       *

       *  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

       *    is not extracted)

       *  - an exception occurs (and in this case is caught)

       *

       * If no characters are stored, failbit is set in the stream's error

       * state.

      */

      __istream_type&

      get(__streambuf_type& __sb, char_type __delim);

      /**

       *  @brief  Extraction into another streambuf.

       *  @param  __sb  A streambuf in which to store data.

       *  @return  *this

       *

       *  Returns @c get(__sb,widen('\\n')).

      */

      __istream_type&

      get(__streambuf_type& __sb)

      { return this->get(__sb, this->widen('\n')); }

      /**

       *  @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.

       *  @return  *this

       *

       *  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.

       *

       *  -# 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

       *     is extracted (and therefore counted in @c gcount()) but not stored

       *  -# @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

       *  input should therefore not cause failbit to be set.)

       *

       *  In any case, a null character is stored in the next location in

       *  the array.

      */

      __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.

       *  @return  *this

       *

       *  Returns @c getline(__s,__n,widen('\\n')).

      */

      __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.

       *  @return  *this

       *

       *  Extracts characters and throws them away until one of the

       *  following happens:

       *  - if @a __n @c != @c std::numeric_limits::max(), @a __n

       *    characters are extracted

       *  - the input sequence reaches end-of-file

       *  - 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().

       *

       *  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(streamsize __n, int_type __delim);

      __istream_type&

      ignore(streamsize __n);

      __istream_type&

      ignore();

      /**

       *  @brief  Looking ahead in the stream

       *  @return  The next character, or eof().

       *

       *  If, after constructing the sentry object, @c good() is false,

       *  returns @c traits::eof().  Otherwise reads but does not extract

       *  the next input character.

      */

      int_type

      peek();

      /**

       *  @brief  Extraction without delimiters.

       *  @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

       *  - 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&

      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.

       *  @return  The number of characters extracted.

       *

       *  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

       *  - if @c A @c == @c 0, extracts no characters

       *  - if @c A @c > @c 0, extracts @c min(A,n)

       *

       *  The goal is to empty the current buffer, and to not request any

       *  more from the external input sequence controlled by the streambuf.

      */

      streamsize

      readsome(char_type* __s, streamsize __n);

      /**

       *  @brief  Unextracting a single character.

       *  @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  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&

      putback(char_type __c);

      /**

       *  @brief  Unextracting the previous character.

       *  @return  *this

       *

       *  If @c rdbuf() is not null, calls @c rdbuf()->sungetc(c).

       *

       *  If @c rdbuf() is null or if @c sungetc() fails, sets badbit in

       *  the error state.

       *

       *  @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&

      unget();

      /**

       *  @brief  Synchronizing the stream buffer.

       *  @return  0 on success, -1 on failure

       *

       *  If @c rdbuf() is a null pointer, returns -1.

       *

       *  Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,

       *  sets badbit and returns -1.

       *

       *  Otherwise, returns 0.

       *

       *  @note  This function does not count the number of characters

       *         extracted, if any, and therefore does not affect the next

       *         call to @c gcount().

      */

      int

      sync();

      /**

       *  @brief  Getting the current read position.

       *  @return  A file position object.

       *

       *  If @c fail() is not false, returns @c pos_type(-1) to indicate

       *  failure.  Otherwise returns @c rdbuf()->pubseekoff(0,cur,in).

       *

       *  @note  This function does not count the number of characters

       *         extracted, if any, and therefore does not affect the next

       *         call to @c gcount().  At variance with putback, unget and

       *         seekg, eofbit is not cleared first.

      */

      pos_type

      tellg();

      /**

       *  @brief  Changing the current read position.

       *  @param  __pos  A file position object.

       *  @return  *this

       *

       *  If @c fail() is not true, calls @c rdbuf()->pubseekpos(__pos).  If

       *  that function fails, sets failbit.

       *

       *  @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&

      seekg(pos_type);

      /**

       *  @brief  Changing the current read position.

       *  @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 that function fails, sets failbit.

       *

       *  @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&

      seekg(off_type, ios_base::seekdir);

      //@}

    protected:

      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

	__istream_type&

	_M_extract(_ValueT& __v);

    };

  /// Explicit specialization declarations, defined in src/istream.cc.

  template<>

    basic_istream&

    basic_istream::

    getline(char_type* __s, streamsize __n, char_type __delim);

  template<>

    basic_istream&

    basic_istream::

    ignore(streamsize __n);

  template<>

    basic_istream&

    basic_istream::

    ignore(streamsize __n, int_type __delim);

#ifdef _GLIBCXX_USE_WCHAR_T

  template<>

    basic_istream&

    basic_istream::

    getline(char_type* __s, streamsize __n, char_type __delim);

  template<>

    basic_istream&

    basic_istream::

    ignore(streamsize __n);

  template<>

    basic_istream&

    basic_istream::

    ignore(streamsize __n, int_type __delim);

#endif

  /**

   *  @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.

  */

  template

    class basic_istream<_CharT, _Traits>::sentry

    {

      // Data Members.

      bool _M_ok;

    public:

      /// Easy access to dependent types.

      typedef _Traits 					traits_type;

      typedef basic_streambuf<_CharT, _Traits> 		__streambuf_type;

      typedef basic_istream<_CharT, _Traits> 		__istream_type;

      typedef typename __istream_type::__ctype_type 	__ctype_type;

      typedef typename _Traits::int_type		__int_type;

      /**

       *  @brief  The constructor performs all the work.

       *  @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.

       *

       *  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

       *     @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 (@a okay).

      */

      explicit

      sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);

      /**

       *  @brief  Quick status checking.

       *  @return  The sentry state.

       *

       *  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; }

    };

  //@{

  /**

   *  @brief  Character extractors

   *  @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.

  */

  template

    basic_istream<_CharT, _Traits>&

    operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c);

  template

    inline basic_istream&

    operator>>(basic_istream& __in, unsigned char& __c)

    { return (__in >> reinterpret_cast(__c)); }

  template

    inline basic_istream&

    operator>>(basic_istream& __in, signed char& __c)

    { return (__in >> reinterpret_cast(__c)); }

  //@}

  //@{

  /**

   *  @brief  Character string extractors

   *  @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:

   *

   *  - 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

   *

   *  Characters are extracted and stored until one of the following happens:

   *  - @c n-1 characters are stored

   *  - EOF is reached

   *  - the next character is whitespace according to the current locale

   *  - the next character is a null byte (i.e., @c charT() )

   *

   *  @c width(0) is then called for the input stream.

   *

   *  If no characters are extracted, sets failbit.

  */

  template

    basic_istream<_CharT, _Traits>&

    operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s);

  // Explicit specialization declaration, defined in src/istream.cc.

  template<>

    basic_istream&

    operator>>(basic_istream& __in, char* __s);

  template

    inline basic_istream&

    operator>>(basic_istream& __in, unsigned char* __s)

    { return (__in >> reinterpret_cast(__s)); }

  template

    inline basic_istream&

    operator>>(basic_istream& __in, signed char* __s)

    { return (__in >> reinterpret_cast(__s)); }

  //@}

  /**

   *  @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

    class basic_iostream

    : 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 typename _Traits::int_type 		int_type;

      typedef typename _Traits::pos_type 		pos_type;

      typedef typename _Traits::off_type 		off_type;

      typedef _Traits			 		traits_type;

      // Non-standard Types:

      typedef basic_istream<_CharT, _Traits>		__istream_type;

      typedef basic_ostream<_CharT, _Traits>		__ostream_type;

      /**

       *  @brief  Constructor does nothing.

       *

       *  Both of the parent classes are initialized with the same

       *  streambuf pointer passed to this constructor.

      */

      explicit

      basic_iostream(basic_streambuf<_CharT, _Traits>* __sb)

      : __istream_type(__sb), __ostream_type(__sb) { }

      /**

       *  @brief  Destructor does nothing.

      */

      virtual

      ~basic_iostream() { }

    protected:

      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

    };

  /**

   *  @brief  Quick and easy way to eat whitespace

   *

   *  This manipulator extracts whitespace characters, stopping when the

   *  next character is non-whitespace, or when the input sequence is empty.

   *  If the sequence is empty, @c eofbit is set in the stream, but not

   *  @c failbit.

   *

   *  The current locale is used to distinguish whitespace characters.

   *

   *  Example:

   *  @code

   *     MyClass   mc;

   *

   *     std::cin >> std::ws >> mc;

   *  @endcode

   *  will skip leading whitespace before calling operator>> on cin and your

   *  object.  Note that the same effect can be achieved by creating a

   *  std::basic_istream::sentry inside your definition of operator>>.

  */

  template

    basic_istream<_CharT, _Traits>&

    ws(basic_istream<_CharT, _Traits>& __is);

#if __cplusplus >= 201103L

  // [27.7.1.6] Rvalue stream extraction

  /**

   *  @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

    inline basic_istream<_CharT, _Traits>&

    operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)

    {

      __is >> __x;

      return __is;

    }

#endif // C++11

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#include 

#endif	/* _GLIBCXX_ISTREAM */