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// Utilities used throughout the library -*- C++ -*-
// Copyright (C) 2004-2021 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
// 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
// <>.
/** @file include/bits/utility.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{utility}
* This file contains the parts of `<utility>` needed by other headers,
* so they don't need to include the whole of `<utility>`.
#pragma GCC system_header
#if __cplusplus >= 201103L
#include <type_traits>
#include <bits/move.h>
namespace std _GLIBCXX_VISIBILITY(default)
/// Finds the size of a given tuple type.
template<typename _Tp>
struct tuple_size;
// 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<size_t __i, typename _Tp>
struct tuple_element;
// Duplicate of C++14's tuple_element_t for internal use in C++11 mode
template<size_t __i, typename _Tp>
using __tuple_element_t = typename tuple_element<__i, _Tp>::type;
template<size_t __i, typename _Tp>
struct tuple_element<__i, const _Tp>
typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type;
template<size_t __i, typename _Tp>
struct tuple_element<__i, volatile _Tp>
typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type;
template<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 >= 201402L
// The standard says this macro and alias template should be in <tuple>
// but we define them here, to be available in <utility> and <array> too.
#define __cpp_lib_tuple_element_t 201402L
template<size_t __i, typename _Tp>
using tuple_element_t = typename tuple_element<__i, _Tp>::type;
#endif // C++14
// 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 { };
// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
template<size_t _Num>
struct _Build_index_tuple
#if __has_builtin(__make_integer_seq)
template<typename, size_t... _Indices>
using _IdxTuple = _Index_tuple<_Indices...>;
// Clang defines __make_integer_seq for this purpose.
using __type = __make_integer_seq<_IdxTuple, size_t, _Num>;
// For GCC and other compilers, use __integer_pack instead.
using __type = _Index_tuple<__integer_pack(_Num)...>;
#if __cplusplus >= 201402L
#define __cpp_lib_integer_sequence 201304L
/// Class template integer_sequence
template<typename _Tp, _Tp... _Idx>
struct integer_sequence
typedef _Tp value_type;
static constexpr size_t size() noexcept { return sizeof...(_Idx); }
/// Alias template make_integer_sequence
template<typename _Tp, _Tp _Num>
using make_integer_sequence
#if __has_builtin(__make_integer_seq)
= __make_integer_seq<integer_sequence, _Tp, _Num>;
= integer_sequence<_Tp, __integer_pack(_Num)...>;
/// 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)>;
#if __cplusplus >= 201703L
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{};
inline constexpr bool __is_in_place_type_v = false;
template<typename _Tp>
inline constexpr bool __is_in_place_type_v<in_place_type_t<_Tp>> = true;
template<typename _Tp>
using __is_in_place_type = bool_constant<__is_in_place_type_v<_Tp>>;
#endif // C++17
#endif // C++14
} // namespace
#endif // C++11
#endif /* _GLIBCXX_UTILITY_H */