中间都是一些版权声明（有种遗书的感觉）
Standard iostream objects -*- C++ -*-

Copyright (C) 1997-2013 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
gnuorglicenses

** @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
   *  gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch24
   *  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 HOWTO
   *  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 *