<h2>File Contents: //usr/include/c++/8/iosfwd</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//usr/include/c++/8/iosfwd'><textarea name='file_content' rows='10' cols='50'>// &lt;iosfwd&gt; Forward declarations -*- C++ -*-

// Copyright (C) 1997-2018 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
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file include/iosfwd
 *  This is a Standard C++ Library header.
 */

//
// ISO C++ 14882: 27.2  Forward declarations
//

#ifndef _GLIBCXX_IOSFWD
#define _GLIBCXX_IOSFWD 1

#pragma GCC system_header

#include &lt;bits/c++config.h&gt;
#include &lt;bits/stringfwd.h&gt; 	// For string forward declarations.
#include &lt;bits/postypes.h&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**
   *  @defgroup io I/O
   *
   *  Nearly all of the I/O classes are parameterized on the type of
   *  characters they read and write.  (The major exception is ios_base at
   *  the top of the hierarchy.)  This is a change from pre-Standard
   *  streams, which were not templates.
   *
   *  For ease of use and compatibility, all of the basic_* I/O-related
   *  classes are given typedef names for both of the builtin character
   *  widths (wide and narrow).  The typedefs are the same as the
   *  pre-Standard names, for example:
   *
   *  @code
   *     typedef basic_ifstream&lt;char&gt;  ifstream;
   *  @endcode
   *
   *  Because properly forward-declaring these classes can be difficult, you
   *  should not do it yourself.  Instead, include the &amp;lt;iosfwd&amp;gt;
   *  header, which contains only declarations of all the I/O classes as
   *  well as the typedefs.  Trying to forward-declare the typedefs
   *  themselves (e.g., &lt;code&gt;class ostream;&lt;/code&gt;) is not valid ISO C++.
   *
   *  For more specific declarations, see
   *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects
   *
   *  @{
  */
  class ios_base;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_ios;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_streambuf;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_istream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_ostream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_iostream;


_GLIBCXX_BEGIN_NAMESPACE_CXX11

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt;,
	    typename _Alloc = allocator&lt;_CharT&gt; &gt;
    class basic_stringbuf;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt;,
	   typename _Alloc = allocator&lt;_CharT&gt; &gt;
    class basic_istringstream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt;,
	   typename _Alloc = allocator&lt;_CharT&gt; &gt;
    class basic_ostringstream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt;,
	   typename _Alloc = allocator&lt;_CharT&gt; &gt;
    class basic_stringstream;

_GLIBCXX_END_NAMESPACE_CXX11

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_filebuf;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_ifstream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_ofstream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class basic_fstream;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class istreambuf_iterator;

  template&lt;typename _CharT, typename _Traits = char_traits&lt;_CharT&gt; &gt;
    class ostreambuf_iterator;


  /// Base class for @c char streams.
  typedef basic_ios&lt;char&gt; 		ios;

  /// Base class for @c char buffers.
  typedef basic_streambuf&lt;char&gt; 	streambuf;

  /// Base class for @c char input streams.
  typedef basic_istream&lt;char&gt; 		istream;

  /// Base class for @c char output streams.
  typedef basic_ostream&lt;char&gt; 		ostream;

  /// Base class for @c char mixed input and output streams.
  typedef basic_iostream&lt;char&gt; 		iostream;

  /// Class for @c char memory buffers.
  typedef basic_stringbuf&lt;char&gt; 	stringbuf;

  /// Class for @c char input memory streams.
  typedef basic_istringstream&lt;char&gt; 	istringstream;

  /// Class for @c char output memory streams.
  typedef basic_ostringstream&lt;char&gt; 	ostringstream;

  /// Class for @c char mixed input and output memory streams.
  typedef basic_stringstream&lt;char&gt; 	stringstream;

  /// Class for @c char file buffers.
  typedef basic_filebuf&lt;char&gt; 		filebuf;

  /// Class for @c char input file streams.
  typedef basic_ifstream&lt;char&gt; 		ifstream;

  /// Class for @c char output file streams.
  typedef basic_ofstream&lt;char&gt; 		ofstream;

  /// Class for @c char mixed input and output file streams.
  typedef basic_fstream&lt;char&gt; 		fstream;

#ifdef _GLIBCXX_USE_WCHAR_T
  /// Base class for @c wchar_t streams.
  typedef basic_ios&lt;wchar_t&gt; 		wios;

  /// Base class for @c wchar_t buffers.
  typedef basic_streambuf&lt;wchar_t&gt; 	wstreambuf;

  /// Base class for @c wchar_t input streams.
  typedef basic_istream&lt;wchar_t&gt; 	wistream;

  /// Base class for @c wchar_t output streams.
  typedef basic_ostream&lt;wchar_t&gt; 	wostream;

  /// Base class for @c wchar_t mixed input and output streams.
  typedef basic_iostream&lt;wchar_t&gt; 	wiostream;

  /// Class for @c wchar_t memory buffers.
  typedef basic_stringbuf&lt;wchar_t&gt; 	wstringbuf;

  /// Class for @c wchar_t input memory streams.
  typedef basic_istringstream&lt;wchar_t&gt; 	wistringstream;

  /// Class for @c wchar_t output memory streams.
  typedef basic_ostringstream&lt;wchar_t&gt; 	wostringstream;

  /// Class for @c wchar_t mixed input and output memory streams.
  typedef basic_stringstream&lt;wchar_t&gt; 	wstringstream;

  /// Class for @c wchar_t file buffers.
  typedef basic_filebuf&lt;wchar_t&gt; 	wfilebuf;

  /// Class for @c wchar_t input file streams.
  typedef basic_ifstream&lt;wchar_t&gt; 	wifstream;

  /// Class for @c wchar_t output file streams.
  typedef basic_ofstream&lt;wchar_t&gt; 	wofstream;

  /// Class for @c wchar_t mixed input and output file streams.
  typedef basic_fstream&lt;wchar_t&gt; 	wfstream;
#endif
  /** @}  */

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _GLIBCXX_IOSFWD */
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