[thirdparty/gcc.git] / libstdc++-v3 / include / std / utility

// <utility> -*- C++ -*-

// Copyright (C) 2001-2017 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/>.

/*
 *
 * 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 <bits/c++config.h>
#include <bits/stl_relops.h>
#include <bits/stl_pair.h>

#if __cplusplus >= 201103L

#include <type_traits>
#include <bits/move.h>
#include <initializer_list>

#if __cplusplus > 201402L
#include <exception>
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /// Finds the size of a given tuple type.
  template<typename _Tp>
    struct tuple_size;

  // _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 2313. tuple_size should always derive from integral_constant<size_t, N>
  // 2770. tuple_size<const T> specialization is not SFINAE compatible

  template<typename _Tp,
	   typename _Up = typename remove_cv<_Tp>::type,
	   typename = typename enable_if<is_same<_Tp, _Up>::value>::type,
	   size_t = tuple_size<_Tp>::value>
    using __enable_if_has_tuple_size = _Tp;

  template<typename _Tp>
    struct tuple_size<const __enable_if_has_tuple_size<_Tp>>
    : public tuple_size<_Tp> { };

  template<typename _Tp>
    struct tuple_size<volatile __enable_if_has_tuple_size<_Tp>>
    : public tuple_size<_Tp> { };

  template<typename _Tp>
    struct tuple_size<const volatile __enable_if_has_tuple_size<_Tp>>
    : public tuple_size<_Tp> { };

  /// Gives the type of the ith element of a given tuple type.
  template<std::size_t __i, typename _Tp>
    struct tuple_element;

  // Duplicate of C++14's tuple_element_t for internal use in C++11 mode
  template<std::size_t __i, typename _Tp>
    using __tuple_element_t = typename tuple_element<__i, _Tp>::type;

  template<std::size_t __i, typename _Tp>
    struct tuple_element<__i, const _Tp>
    {
      typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type;
    };

  template<std::size_t __i, typename _Tp>
    struct tuple_element<__i, volatile _Tp>
    {
      typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type;
    };

  template<std::size_t __i, typename _Tp>
    struct tuple_element<__i, const volatile _Tp>
    {
      typedef typename add_cv<__tuple_element_t<__i, _Tp>>::type type;
    };

#if __cplusplus > 201103L
#define __cpp_lib_tuple_element_t 201402

  template<std::size_t __i, typename _Tp>
    using tuple_element_t = typename tuple_element<__i, _Tp>::type;
#endif

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

  /// Partial specialization for std::pair
  template<typename _T1, typename _T2>
    struct __is_tuple_like_impl<std::pair<_T1, _T2>> : true_type
    { };

  /// Partial specialization for std::pair
  template<class _Tp1, class _Tp2>
    struct tuple_size<std::pair<_Tp1, _Tp2>>
    : public integral_constant<std::size_t, 2> { };

  /// Partial specialization for std::pair
  template<class _Tp1, class _Tp2>
    struct tuple_element<0, std::pair<_Tp1, _Tp2>>
    { typedef _Tp1 type; };

  /// Partial specialization for std::pair
  template<class _Tp1, class _Tp2>
    struct tuple_element<1, std::pair<_Tp1, _Tp2>>
    { typedef _Tp2 type; };

  template<std::size_t _Int>
    struct __pair_get;

  template<>
    struct __pair_get<0>
    {
      template<typename _Tp1, typename _Tp2>
        static constexpr _Tp1&
        __get(std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.first; }

      template<typename _Tp1, typename _Tp2>
        static constexpr _Tp1&&
        __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<_Tp1>(__pair.first); }

      template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp1&
        __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.first; }

      template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp1&&
        __const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<const _Tp1>(__pair.first); }
    };

  template<>
    struct __pair_get<1>
    {
      template<typename _Tp1, typename _Tp2>
        static constexpr _Tp2&
        __get(std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.second; }

      template<typename _Tp1, typename _Tp2>
        static constexpr _Tp2&&
        __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<_Tp2>(__pair.second); }

      template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp2&
        __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.second; }

      template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp2&&
        __const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<const _Tp2>(__pair.second); }
    };

  template<std::size_t _Int, class _Tp1, class _Tp2>
    constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
    get(std::pair<_Tp1, _Tp2>& __in) noexcept
    { return __pair_get<_Int>::__get(__in); }

  template<std::size_t _Int, class _Tp1, class _Tp2>
    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<std::size_t _Int, class _Tp1, class _Tp2>
    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); }

  template<std::size_t _Int, class _Tp1, class _Tp2>
    constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
    get(const std::pair<_Tp1, _Tp2>&& __in) noexcept
    { return __pair_get<_Int>::__const_move_get(std::move(__in)); }

#if __cplusplus > 201103L

#define __cpp_lib_tuples_by_type 201304

  template <typename _Tp, typename _Up>
    constexpr _Tp&
    get(pair<_Tp, _Up>& __p) noexcept
    { return __p.first; }

  template <typename _Tp, typename _Up>
    constexpr const _Tp&
    get(const pair<_Tp, _Up>& __p) noexcept
    { return __p.first; }

  template <typename _Tp, typename _Up>
    constexpr _Tp&&
    get(pair<_Tp, _Up>&& __p) noexcept
    { return std::move(__p.first); }

  template <typename _Tp, typename _Up>
    constexpr const _Tp&&
    get(const pair<_Tp, _Up>&& __p) noexcept
    { return std::move(__p.first); }

  template <typename _Tp, typename _Up>
    constexpr _Tp&
    get(pair<_Up, _Tp>& __p) noexcept
    { return __p.second; }

  template <typename _Tp, typename _Up>
    constexpr const _Tp&
    get(const pair<_Up, _Tp>& __p) noexcept
    { return __p.second; }

  template <typename _Tp, typename _Up>
    constexpr _Tp&&
    get(pair<_Up, _Tp>&& __p) noexcept
    { return std::move(__p.second); }

  template <typename _Tp, typename _Up>
    constexpr const _Tp&&
    get(const 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 <typename _Tp, typename _Up = _Tp>
    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<size_t... _Indexes> struct _Index_tuple { };

#ifdef __has_builtin
# if __has_builtin(__make_integer_seq)
#  define _GLIBCXX_USE_MAKE_INTEGER_SEQ 1
# endif
#endif

  // Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
  template<size_t _Num>
    struct _Build_index_tuple
    {
#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
      template<typename, size_t... _Indices>
        using _IdxTuple = _Index_tuple<_Indices...>;

      using __type = __make_integer_seq<_IdxTuple, size_t, _Num>;
#else
      using __type = _Index_tuple<__integer_pack(_Num)...>;
#endif
    };

#if __cplusplus > 201103L

#define __cpp_lib_integer_sequence 201304

  /// Class template integer_sequence
  template<typename _Tp, _Tp... _Idx>
    struct integer_sequence
    {
      typedef _Tp value_type;
      static constexpr size_t size() { return sizeof...(_Idx); }
    };

  /// Alias template make_integer_sequence
  template<typename _Tp, _Tp _Num>
    using make_integer_sequence
#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
      = __make_integer_seq<integer_sequence, _Tp, _Num>;
#else
      = integer_sequence<_Tp, __integer_pack(_Num)...>;
#endif

#undef _GLIBCXX_USE_MAKE_INTEGER_SEQ

  /// Alias template index_sequence
  template<size_t... _Idx>
    using index_sequence = integer_sequence<size_t, _Idx...>;

  /// Alias template make_index_sequence
  template<size_t _Num>
    using make_index_sequence = make_integer_sequence<size_t, _Num>;

  /// Alias template index_sequence_for
  template<typename... _Types>
    using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
#endif

#if __cplusplus > 201402L

  struct in_place_t {
    explicit in_place_t() = default;
  };

  inline constexpr in_place_t in_place{};

  template<typename _Tp> struct in_place_type_t
  {
    explicit in_place_type_t() = default;
  };

  template<typename _Tp>
    inline constexpr in_place_type_t<_Tp> in_place_type{};

  template<size_t _Idx> struct in_place_index_t
  {
    explicit in_place_index_t() = default;
  };

  template<size_t _Idx>
    inline constexpr in_place_index_t<_Idx> in_place_index{};

  template<typename>
    struct __is_in_place_type_impl : false_type
    { };

  template<typename _Tp>
    struct __is_in_place_type_impl<in_place_type_t<_Tp>> : true_type
    { };

  template<typename _Tp>
    struct __is_in_place_type
      : public __is_in_place_type_impl<_Tp>
    { };

#define  __cpp_lib_as_const 201510
  template<typename _Tp>
    constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }

  template<typename _Tp>
    void as_const(const _Tp&&) = delete;

#endif // C++17

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

#endif /* _GLIBCXX_UTILITY */
Commit	Line	Data
54c1bf78	1	// <utility> -- C++ --
de96ac46	2
cbe34bb5	3	// Copyright (C) 2001-2017 Free Software Foundation, Inc.
de96ac46 BK	4	//
	5	// This file is part of the GNU ISO C++ Library. This library is free
	6	// software; you can redistribute it and/or modify it under the
	7	// terms of the GNU General Public License as published by the
748086b7	8	// Free Software Foundation; either version 3, or (at your option)
de96ac46 BK	9	// any later version.
	10
	11	// This library is distributed in the hope that it will be useful,
	12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	// GNU General Public License for more details.
	15
748086b7 JJ	16	// Under Section 7 of GPL version 3, you are granted additional
	17	// permissions described in the GCC Runtime Library Exception, version
	18	// 3.1, as published by the Free Software Foundation.
de96ac46	19
748086b7 JJ	20	// You should have received a copy of the GNU General Public License and
	21	// a copy of the GCC Runtime Library Exception along with this program;
	22	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	23	// <http://www.gnu.org/licenses/>.
de96ac46	24
54c1bf78 BK	25	/*
	26	*
	27	* Copyright (c) 1994
	28	* Hewlett-Packard Company
	29	*
	30	* Permission to use, copy, modify, distribute and sell this software
	31	* and its documentation for any purpose is hereby granted without fee,
	32	* provided that the above copyright notice appear in all copies and
	33	* that both that copyright notice and this permission notice appear
	34	* in supporting documentation. Hewlett-Packard Company makes no
	35	* representations about the suitability of this software for any
	36	* purpose. It is provided "as is" without express or implied warranty.
	37	*
	38	*
	39	* Copyright (c) 1996,1997
	40	* Silicon Graphics Computer Systems, Inc.
	41	*
	42	* Permission to use, copy, modify, distribute and sell this software
	43	* and its documentation for any purpose is hereby granted without fee,
	44	* provided that the above copyright notice appear in all copies and
	45	* that both that copyright notice and this permission notice appear
	46	* in supporting documentation. Silicon Graphics makes no
	47	* representations about the suitability of this software for any
	48	* purpose. It is provided "as is" without express or implied warranty.
	49	*/
	50
143c27b0	51	/** @file include/utility
33ac58d5	52	* This is a Standard C++ Library header.
2f9d51b8 PE	53	*/
2f9d51b8 PE	54
1143680e SE	55	#ifndef _GLIBCXX_UTILITY
1143680e SE	56	#define _GLIBCXX_UTILITY 1
54c1bf78 BK	57
54c1bf78 BK	58	#pragma GCC system_header
285b36d6	59
8e32aa11 BK	60	/**
	61	* @defgroup utilities Utilities
	62	*
	63	* Components deemed generally useful. Includes pair, tuple,
	64	* forward/move helpers, ratio, function object, metaprogramming and
	65	* type traits, time, date, and memory functions.
	66	*/
	67
54c1bf78 BK	68	#include <bits/c++config.h>
	69	#include <bits/stl_relops.h>
	70	#include <bits/stl_pair.h>
	71
734f5023	72	#if __cplusplus >= 201103L
a15f7cb8	73
7d17de7f	74	#include <type_traits>
53dc5044 PC	75	#include <bits/move.h>
	76	#include <initializer_list>
	77
25a69162 VV	78	#if __cplusplus > 201402L
	79	#include <exception>
	80	#endif
	81
12ffa228 BK	82	namespace std _GLIBCXX_VISIBILITY(default)
	83	{
	84	_GLIBCXX_BEGIN_NAMESPACE_VERSION
53dc5044	85
de0830e1 VV	86	/// Finds the size of a given tuple type.
	87	template<typename _Tp>
	88	struct tuple_size;
	89
	90	// _GLIBCXX_RESOLVE_LIB_DEFECTS
f859f912	91	// 2313. tuple_size should always derive from integral_constant<size_t, N>
6ae2ae3b	92	// 2770. tuple_size<const T> specialization is not SFINAE compatible
6ae2ae3b	93
f859f912 JW	94	template<typename _Tp,
	95	typename _Up = typename remove_cv<_Tp>::type,
	96	typename = typename enable_if<is_same<_Tp, _Up>::value>::type,
	97	size_t = tuple_size<_Tp>::value>
	98	using __enable_if_has_tuple_size = _Tp;
de0830e1	99
6ae2ae3b	100	template<typename _Tp>
f859f912 JW	101	struct tuple_size<const __enable_if_has_tuple_size<_Tp>>
f859f912 JW	102	: public tuple_size<_Tp> { };
6ae2ae3b	103
de0830e1	104	template<typename _Tp>
f859f912 JW	105	struct tuple_size<volatile __enable_if_has_tuple_size<_Tp>>
f859f912 JW	106	: public tuple_size<_Tp> { };
de0830e1 VV	107
de0830e1 VV	108	template<typename _Tp>
f859f912 JW	109	struct tuple_size<const volatile __enable_if_has_tuple_size<_Tp>>
f859f912 JW	110	: public tuple_size<_Tp> { };
de0830e1 VV	111
	112	/// Gives the type of the ith element of a given tuple type.
	113	template<std::size_t __i, typename _Tp>
	114	struct tuple_element;
	115
	116	// Duplicate of C++14's tuple_element_t for internal use in C++11 mode
	117	template<std::size_t __i, typename _Tp>
	118	using __tuple_element_t = typename tuple_element<__i, _Tp>::type;
	119
	120	template<std::size_t __i, typename _Tp>
	121	struct tuple_element<__i, const _Tp>
	122	{
	123	typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type;
	124	};
	125
	126	template<std::size_t __i, typename _Tp>
	127	struct tuple_element<__i, volatile _Tp>
	128	{
	129	typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type;
	130	};
	131
	132	template<std::size_t __i, typename _Tp>
	133	struct tuple_element<__i, const volatile _Tp>
	134	{
	135	typedef typename add_cv<__tuple_element_t<__i, _Tp>>::type type;
	136	};
	137
	138	#if __cplusplus > 201103L
	139	#define __cpp_lib_tuple_element_t 201402
	140
	141	template<std::size_t __i, typename _Tp>
	142	using tuple_element_t = typename tuple_element<__i, _Tp>::type;
	143	#endif
53dc5044	144
7d17de7f FD	145	// Various functions which give std::pair a tuple-like interface.
	146
	147	/// Partial specialization for std::pair
	148	template<typename _T1, typename _T2>
	149	struct __is_tuple_like_impl<std::pair<_T1, _T2>> : true_type
	150	{ };
3a004764 JW	151
3a004764 JW	152	/// Partial specialization for std::pair
53dc5044	153	template<class _Tp1, class _Tp2>
7933dc2a	154	struct tuple_size<std::pair<_Tp1, _Tp2>>
664e12c1	155	: public integral_constant<std::size_t, 2> { };
53dc5044	156
3a004764	157	/// Partial specialization for std::pair
53dc5044	158	template<class _Tp1, class _Tp2>
7933dc2a	159	struct tuple_element<0, std::pair<_Tp1, _Tp2>>
53dc5044	160	{ typedef _Tp1 type; };
33ac58d5	161
3a004764	162	/// Partial specialization for std::pair
53dc5044	163	template<class _Tp1, class _Tp2>
7933dc2a	164	struct tuple_element<1, std::pair<_Tp1, _Tp2>>
53dc5044 PC	165	{ typedef _Tp2 type; };
	166
	167	template<std::size_t _Int>
	168	struct __pair_get;
	169
	170	template<>
	171	struct __pair_get<0>
	172	{
	173	template<typename _Tp1, typename _Tp2>
9480716c	174	static constexpr _Tp1&
7933dc2a	175	__get(std::pair<_Tp1, _Tp2>& __pair) noexcept
18eeaec4 PC	176	{ return __pair.first; }
18eeaec4 PC	177
18eeaec4	178	template<typename _Tp1, typename _Tp2>
9480716c	179	static constexpr _Tp1&&
18eeaec4 PC	180	__move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
18eeaec4 PC	181	{ return std::forward<_Tp1>(__pair.first); }
53dc5044 PC	182
53dc5044 PC	183	template<typename _Tp1, typename _Tp2>
9480716c	184	static constexpr const _Tp1&
7933dc2a	185	__const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
18eeaec4	186	{ return __pair.first; }
ccbbf8df VV	187
	188	template<typename _Tp1, typename _Tp2>
	189	static constexpr const _Tp1&&
	190	__const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
	191	{ return std::forward<const _Tp1>(__pair.first); }
53dc5044 PC	192	};
	193
	194	template<>
	195	struct __pair_get<1>
	196	{
	197	template<typename _Tp1, typename _Tp2>
9480716c	198	static constexpr _Tp2&
7933dc2a	199	__get(std::pair<_Tp1, _Tp2>& __pair) noexcept
18eeaec4 PC	200	{ return __pair.second; }
18eeaec4 PC	201
18eeaec4	202	template<typename _Tp1, typename _Tp2>
9480716c	203	static constexpr _Tp2&&
18eeaec4 PC	204	__move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
18eeaec4 PC	205	{ return std::forward<_Tp2>(__pair.second); }
53dc5044 PC	206
53dc5044 PC	207	template<typename _Tp1, typename _Tp2>
9480716c	208	static constexpr const _Tp2&
7933dc2a	209	__const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
18eeaec4	210	{ return __pair.second; }
ccbbf8df VV	211
	212	template<typename _Tp1, typename _Tp2>
	213	static constexpr const _Tp2&&
	214	__const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
	215	{ return std::forward<const _Tp2>(__pair.second); }
53dc5044 PC	216	};
	217
	218	template<std::size_t _Int, class _Tp1, class _Tp2>
9480716c	219	constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
7933dc2a	220	get(std::pair<_Tp1, _Tp2>& __in) noexcept
53dc5044 PC	221	{ return __pair_get<_Int>::__get(__in); }
53dc5044 PC	222
18eeaec4	223	template<std::size_t _Int, class _Tp1, class _Tp2>
9480716c	224	constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
18eeaec4 PC	225	get(std::pair<_Tp1, _Tp2>&& __in) noexcept
18eeaec4 PC	226	{ return __pair_get<_Int>::__move_get(std::move(__in)); }
18eeaec4	227
53dc5044	228	template<std::size_t _Int, class _Tp1, class _Tp2>
9480716c	229	constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
7933dc2a	230	get(const std::pair<_Tp1, _Tp2>& __in) noexcept
53dc5044 PC	231	{ return __pair_get<_Int>::__const_get(__in); }
53dc5044 PC	232
ccbbf8df VV	233	template<std::size_t _Int, class _Tp1, class _Tp2>
	234	constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
	235	get(const std::pair<_Tp1, _Tp2>&& __in) noexcept
	236	{ return __pair_get<_Int>::__const_move_get(std::move(__in)); }
	237
c98b0598	238	#if __cplusplus > 201103L
a15f7cb8 ESR	239
	240	#define __cpp_lib_tuples_by_type 201304
	241
b5a8fed6 JW	242	template <typename _Tp, typename _Up>
	243	constexpr _Tp&
	244	get(pair<_Tp, _Up>& __p) noexcept
	245	{ return __p.first; }
	246
	247	template <typename _Tp, typename _Up>
	248	constexpr const _Tp&
	249	get(const pair<_Tp, _Up>& __p) noexcept
	250	{ return __p.first; }
	251
	252	template <typename _Tp, typename _Up>
	253	constexpr _Tp&&
	254	get(pair<_Tp, _Up>&& __p) noexcept
	255	{ return std::move(__p.first); }
	256
ccbbf8df VV	257	template <typename _Tp, typename _Up>
	258	constexpr const _Tp&&
	259	get(const pair<_Tp, _Up>&& __p) noexcept
	260	{ return std::move(__p.first); }
	261
b5a8fed6 JW	262	template <typename _Tp, typename _Up>
	263	constexpr _Tp&
	264	get(pair<_Up, _Tp>& __p) noexcept
	265	{ return __p.second; }
	266
	267	template <typename _Tp, typename _Up>
	268	constexpr const _Tp&
	269	get(const pair<_Up, _Tp>& __p) noexcept
	270	{ return __p.second; }
	271
	272	template <typename _Tp, typename _Up>
	273	constexpr _Tp&&
	274	get(pair<_Up, _Tp>&& __p) noexcept
	275	{ return std::move(__p.second); }
	276
ccbbf8df VV	277	template <typename _Tp, typename _Up>
	278	constexpr const _Tp&&
	279	get(const pair<_Up, _Tp>&& __p) noexcept
	280	{ return std::move(__p.second); }
	281
a15f7cb8 ESR	282	#define __cpp_lib_exchange_function 201304
a15f7cb8 ESR	283
c98b0598	284	/// Assign @p __new_val to @p __obj and return its previous value.
b5a8fed6	285	template <typename _Tp, typename _Up = _Tp>
c98b0598 JW	286	inline _Tp
c98b0598 JW	287	exchange(_Tp& __obj, _Up&& __new_val)
9b817548	288	{ return std::__exchange(__obj, std::forward<_Up>(__new_val)); }
c98b0598 JW	289	#endif
c98b0598 JW	290
1b1bdc03 JW	291	// Stores a tuple of indices. Used by tuple and pair, and by bind() to
1b1bdc03 JW	292	// extract the elements in a tuple.
5f0b7c95 JW	293	template<size_t... _Indexes> struct _Index_tuple { };
5f0b7c95 JW	294
db624b3b JW	295	#ifdef __has_builtin
	296	# if __has_builtin(__make_integer_seq)
	297	# define _GLIBCXX_USE_MAKE_INTEGER_SEQ 1
	298	# endif
	299	#endif
1b1bdc03 JW	300
	301	// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
	302	template<size_t _Num>
	303	struct _Build_index_tuple
	304	{
db624b3b JW	305	#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
	306	template<typename, size_t... _Indices>
	307	using _IdxTuple = _Index_tuple<_Indices...>;
1b1bdc03	308
db624b3b JW	309	using __type = __make_integer_seq<_IdxTuple, size_t, _Num>;
	310	#else
	311	using __type = _Index_tuple<__integer_pack(_Num)...>;
	312	#endif
1b1bdc03 JW	313	};
	314
	315	#if __cplusplus > 201103L
a15f7cb8 ESR	316
	317	#define __cpp_lib_integer_sequence 201304
	318
1b1bdc03 JW	319	/// Class template integer_sequence
	320	template<typename _Tp, _Tp... _Idx>
	321	struct integer_sequence
	322	{
	323	typedef _Tp value_type;
	324	static constexpr size_t size() { return sizeof...(_Idx); }
	325	};
	326
1b1bdc03 JW	327	/// Alias template make_integer_sequence
	328	template<typename _Tp, _Tp _Num>
	329	using make_integer_sequence
db624b3b JW	330	#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
	331	= __make_integer_seq<integer_sequence, _Tp, _Num>;
	332	#else
	333	= integer_sequence<_Tp, __integer_pack(_Num)...>;
	334	#endif
	335
	336	#undef _GLIBCXX_USE_MAKE_INTEGER_SEQ
1b1bdc03 JW	337
	338	/// Alias template index_sequence
	339	template<size_t... _Idx>
	340	using index_sequence = integer_sequence<size_t, _Idx...>;
	341
	342	/// Alias template make_index_sequence
	343	template<size_t _Num>
	344	using make_index_sequence = make_integer_sequence<size_t, _Num>;
	345
	346	/// Alias template index_sequence_for
	347	template<typename... _Types>
	348	using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
	349	#endif
	350
25a69162 VV	351	#if __cplusplus > 201402L
25a69162 VV	352
627a2f59 VV	353	struct in_place_t {
627a2f59 VV	354	explicit in_place_t() = default;
25a69162 VV	355	};
25a69162 VV	356
627a2f59 VV	357	inline constexpr in_place_t in_place{};
	358
	359	template<typename _Tp> struct in_place_type_t
	360	{
	361	explicit in_place_type_t() = default;
	362	};
	363
	364	template<typename _Tp>
	365	inline constexpr in_place_type_t<_Tp> in_place_type{};
	366
	367	template<size_t _Idx> struct in_place_index_t
	368	{
	369	explicit in_place_index_t() = default;
	370	};
	371
	372	template<size_t _Idx>
	373	inline constexpr in_place_index_t<_Idx> in_place_index{};
25a69162	374
5c578ae4 VV	375	template<typename>
	376	struct __is_in_place_type_impl : false_type
	377	{ };
	378
	379	template<typename _Tp>
	380	struct __is_in_place_type_impl<in_place_type_t<_Tp>> : true_type
	381	{ };
	382
	383	template<typename _Tp>
	384	struct __is_in_place_type
	385	: public __is_in_place_type_impl<_Tp>
	386	{ };
	387
32eaac9c JW	388	#define __cpp_lib_as_const 201510
	389	template<typename _Tp>
	390	constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
	391
	392	template<typename _Tp>
	393	void as_const(const _Tp&&) = delete;
	394
5c578ae4	395	#endif // C++17
25a69162	396
12ffa228 BK	397	_GLIBCXX_END_NAMESPACE_VERSION
12ffa228 BK	398	} // namespace
53dc5044	399
af13a7a6 BK	400	#endif
af13a7a6 BK	401
1143680e	402	#endif /* _GLIBCXX_UTILITY */