iostream

Go to the documentation of this file.

// Standard iostream objects -*- C++ -*-
 
// Copyright (C) 1997-2021 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
// <http://www.gnu.org/licenses/>.
 
/** @file include/iostream
 *  This is a Standard C++ Library header.
 */
 
//
// ISO C++ 14882: 27.3  Standard iostream objects
//
 
#ifndef _GLIBCXX_IOSTREAM
#define _GLIBCXX_IOSTREAM 1
 
#pragma GCC system_header
 
#include <bits/c++config.h>
#include <ostream>
#include <istream>
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
  /**
   *  @name Standard Stream Objects
   *
   *  The &lt;iostream&gt; header declares the eight <em>standard stream
   *  objects</em>.  For other declarations, see
   *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html
   *  and the @link iosfwd I/O forward declarations @endlink
   *
   *  They are required by default to cooperate with the global C
   *  library's @c FILE streams, and to be available during program
   *  startup and termination. For more information, see the section of the
   *  manual linked to above.
  */
  ///@{
  extern istream cin;           /// Linked to standard input
  extern ostream cout;          /// Linked to standard output
  extern ostream cerr;          /// Linked to standard error (unbuffered)
  extern ostream clog;          /// Linked to standard error (buffered)
 
#ifdef _GLIBCXX_USE_WCHAR_T
  extern wistream wcin;         /// Linked to standard input
  extern wostream wcout;        /// Linked to standard output
  extern wostream wcerr;        /// Linked to standard error (unbuffered)
  extern wostream wclog;        /// Linked to standard error (buffered)
#endif
  ///@}
 
  // For construction of filebuffers for cout, cin, cerr, clog et. al.
  static ios_base::Init __ioinit;
 
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
 
#endif /* _GLIBCXX_IOSTREAM */