*优美胜于丑陋 显式胜于隐式 简洁胜于复杂 复杂胜于凌乱 扁平胜于嵌套 间隔胜于紧凑 // Standard iostream objects -- C++ --

// Copyright (C) 1997-2014 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 #include

namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION

/**

• @name Standard Stream Objects
• The <iostream> header declares the eight 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 ***