iostream源码

// Standard iostream objects -*- 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
// <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 */