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//  -*- C++ -*-

// Copyright (C) 2001-2015 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

// .

/*

 *

 * 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 

#if __cplusplus >= 201103L

#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.

  /// Partial specialization for std::pair

  template

    struct tuple_size>

    : public integral_constant { };

  /// Partial specialization for std::pair

  template

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

    { typedef _Tp1 type; };

  /// Partial specialization for std::pair

  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); }

#if __cplusplus > 201103L

#define __cpp_lib_tuples_by_type 201304

  template 

    constexpr _Tp&

    get(pair<_Tp, _Up>& __p) noexcept

    { return __p.first; }

  template 

    constexpr const _Tp&

    get(const pair<_Tp, _Up>& __p) noexcept

    { return __p.first; }

  template 

    constexpr _Tp&&

    get(pair<_Tp, _Up>&& __p) noexcept

    { return std::move(__p.first); }

  template 

    constexpr _Tp&

    get(pair<_Up, _Tp>& __p) noexcept

    { return __p.second; }

  template 

    constexpr const _Tp&

    get(const pair<_Up, _Tp>& __p) noexcept

    { return __p.second; }

  template 

    constexpr _Tp&&

    get(pair<_Up, _Tp>&& __p) noexcept

    { return std::move(__p.second); }

#define __cpp_lib_exchange_function 201304

  /// Assign @p __new_val to @p __obj and return its previous value.

  template 

    inline _Tp

    exchange(_Tp& __obj, _Up&& __new_val)

    { return std::__exchange(__obj, std::forward<_Up>(__new_val)); }

#endif

  // Stores a tuple of indices.  Used by tuple and pair, and by bind() to

  // extract the elements in a tuple.

  template

    struct _Index_tuple

    {

      typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next;

    };

  // Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.

  template

    struct _Build_index_tuple

    {

      typedef typename _Build_index_tuple<_Num - 1>::__type::__next __type;

    };

  template<>

    struct _Build_index_tuple<0>

    {

      typedef _Index_tuple<> __type;

    };

#if __cplusplus > 201103L

#define __cpp_lib_integer_sequence 201304

  /// Class template integer_sequence

  template

    struct integer_sequence

    {

      typedef _Tp value_type;

      static constexpr size_t size() { return sizeof...(_Idx); }

    };

  template

	   typename _ISeq = typename _Build_index_tuple<_Num>::__type>

    struct _Make_integer_sequence;

  template

    struct _Make_integer_sequence<_Tp, _Num, _Index_tuple<_Idx...>>

    {

      static_assert( _Num >= 0,

		     "Cannot make integer sequence of negative length" );

      typedef integer_sequence<_Tp, static_cast<_Tp>(_Idx)...> __type;

    };

  /// Alias template make_integer_sequence

  template

    using make_integer_sequence

      = typename _Make_integer_sequence<_Tp, _Num>::__type;

  /// Alias template index_sequence

  template

    using index_sequence = integer_sequence;

  /// Alias template make_index_sequence

  template

    using make_index_sequence = make_integer_sequence;

  /// Alias template index_sequence_for

  template

    using index_sequence_for = make_index_sequence;

#endif

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

#endif

#endif /* _GLIBCXX_UTILITY */