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//  -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,

// 2010, 2011

// 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

// .

/*

 *

 * Copyright (c) 1994

 * Hewlett-Packard Company

 *

 * Permission to use, copy, modify, distribute and sell this software

 * and its documentation for any purpose is hereby granted without fee,

 * provided that the above copyright notice appear in all copies and

 * that both that copyright notice and this permission notice appear

 * in supporting documentation.  Hewlett-Packard Company makes no

 * representations about the suitability of this software for any

 * purpose.  It is provided "as is" without express or implied warranty.

 *

 *

 * Copyright (c) 1996,1997

 * Silicon Graphics Computer Systems, Inc.

 *

 * Permission to use, copy, modify, distribute and sell this software

 * and its documentation for any purpose is hereby granted without fee,

 * provided that the above copyright notice appear in all copies and

 * that both that copyright notice and this permission notice appear

 * in supporting documentation.  Silicon Graphics makes no

 * representations about the suitability of this software for any

 * purpose.  It is provided "as is" without express or implied warranty.

 */

/** @file include/utility

 *  This is a Standard C++ Library header.

 */

#ifndef _GLIBCXX_UTILITY

#define _GLIBCXX_UTILITY 1

#pragma GCC system_header

/**

 * @defgroup utilities Utilities

 *

 * Components deemed generally useful. Includes pair, tuple,

 * forward/move helpers, ratio, function object, metaprogramming and

 * type traits, time, date, and memory functions.

 */

#include 

#include 

#include 

#ifdef __GXX_EXPERIMENTAL_CXX0X__

#include 

#include 

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  template

    class tuple_size;

  template

    class tuple_element;

   // Various functions which give std::pair a tuple-like interface.

  template

    struct tuple_size>

    : public integral_constant { };

  template

    struct tuple_element<0, std::pair<_Tp1, _Tp2>>

    { typedef _Tp1 type; };

  template

    struct tuple_element<1, std::pair<_Tp1, _Tp2>>

    { typedef _Tp2 type; };

  template

    struct __pair_get;

  template<>

    struct __pair_get<0>

    {

      template

        static constexpr _Tp1&

        __get(std::pair<_Tp1, _Tp2>& __pair) noexcept

        { return __pair.first; }

      template

        static constexpr _Tp1&&

        __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept

        { return std::forward<_Tp1>(__pair.first); }

      template

        static constexpr const _Tp1&

        __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept

        { return __pair.first; }

    };

  template<>

    struct __pair_get<1>

    {

      template

        static constexpr _Tp2&

        __get(std::pair<_Tp1, _Tp2>& __pair) noexcept

        { return __pair.second; }

      template

        static constexpr _Tp2&&

        __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept

        { return std::forward<_Tp2>(__pair.second); }

      template

        static constexpr const _Tp2&

        __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept

        { return __pair.second; }

    };

  template

    constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&

    get(std::pair<_Tp1, _Tp2>& __in) noexcept

    { return __pair_get<_Int>::__get(__in); }

  template

    constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&

    get(std::pair<_Tp1, _Tp2>&& __in) noexcept

    { return __pair_get<_Int>::__move_get(std::move(__in)); }

  template

    constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&

    get(const std::pair<_Tp1, _Tp2>& __in) noexcept

    { return __pair_get<_Int>::__const_get(__in); }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#endif

#endif /* _GLIBCXX_UTILITY */