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0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP_TUPLE
0011 #define _LIBCPP_TUPLE
0012
0013 // clang-format off
0014
0015 /*
0016 tuple synopsis
0017
0018 namespace std
0019 {
0020
0021 template <class... T>
0022 class tuple {
0023 public:
0024 explicit(see-below) constexpr tuple();
0025 explicit(see-below) tuple(const T&...); // constexpr in C++14
0026 template <class... U>
0027 explicit(see-below) tuple(U&&...); // constexpr in C++14
0028 tuple(const tuple&) = default;
0029 tuple(tuple&&) = default;
0030
0031 template<class... UTypes>
0032 constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23
0033 template <class... U>
0034 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14
0035 template <class... U>
0036 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14
0037 template<class... UTypes>
0038 constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23
0039
0040 template<class U1, class U2>
0041 constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23
0042 template <class U1, class U2>
0043 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
0044 template <class U1, class U2>
0045 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14
0046 template<class U1, class U2>
0047 constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23
0048
0049 // allocator-extended constructors
0050 template <class Alloc>
0051 tuple(allocator_arg_t, const Alloc& a);
0052 template <class Alloc>
0053 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20
0054 template <class Alloc, class... U>
0055 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20
0056 template <class Alloc>
0057 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20
0058 template <class Alloc>
0059 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20
0060 template<class Alloc, class... UTypes>
0061 constexpr explicit(see-below)
0062 tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23
0063 template <class Alloc, class... U>
0064 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20
0065 template <class Alloc, class... U>
0066 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20
0067 template<class Alloc, class... UTypes>
0068 constexpr explicit(see-below)
0069 tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23
0070 template<class Alloc, class U1, class U2>
0071 constexpr explicit(see-below)
0072 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23
0073 template <class Alloc, class U1, class U2>
0074 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20
0075 template <class Alloc, class U1, class U2>
0076 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20
0077 template<class Alloc, class U1, class U2>
0078 constexpr explicit(see-below)
0079 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23
0080
0081 tuple& operator=(const tuple&); // constexpr in C++20
0082 constexpr const tuple& operator=(const tuple&) const; // C++23
0083 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20
0084 constexpr const tuple& operator=(tuple&&) const; // C++23
0085 template <class... U>
0086 tuple& operator=(const tuple<U...>&); // constexpr in C++20
0087 template<class... UTypes>
0088 constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23
0089 template <class... U>
0090 tuple& operator=(tuple<U...>&&); // constexpr in C++20
0091 template<class... UTypes>
0092 constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23
0093 template <class U1, class U2>
0094 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20
0095 template<class U1, class U2>
0096 constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23
0097 template <class U1, class U2>
0098 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20
0099 template<class U1, class U2>
0100 constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23
0101
0102 template<class U, size_t N>
0103 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION
0104 template<class U, size_t N>
0105 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION
0106
0107 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20
0108 constexpr void swap(const tuple&) const noexcept(see-below); // C++23
0109 };
0110
0111
0112 template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23
0113 requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; }
0114 struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> {
0115 using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>;
0116 };
0117
0118 template<class... TTypes, class... UTypes> // since C++23
0119 requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; }
0120 struct common_type<tuple<TTypes...>, tuple<UTypes...>> {
0121 using type = tuple<common_type_t<TTypes, UTypes>...>;
0122 };
0123
0124 template <class ...T>
0125 tuple(T...) -> tuple<T...>; // since C++17
0126 template <class T1, class T2>
0127 tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17
0128 template <class Alloc, class ...T>
0129 tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17
0130 template <class Alloc, class T1, class T2>
0131 tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17
0132 template <class Alloc, class ...T>
0133 tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17
0134
0135 struct ignore-type { // exposition only // Since C++26
0136 constexpr const ignore-type&
0137 operator=(const auto &) const noexcept
0138 { return *this; }
0139 };
0140 inline constexpr ignore-type ignore;
0141
0142 template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
0143 template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
0144 template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
0145 template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
0146
0147 // [tuple.apply], calling a function with a tuple of arguments:
0148 template <class F, class Tuple>
0149 constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23
0150 template <class T, class Tuple>
0151 constexpr T make_from_tuple(Tuple&& t); // C++17
0152
0153 // 20.4.1.4, tuple helper classes:
0154 template <class T> struct tuple_size; // undefined
0155 template <class... T> struct tuple_size<tuple<T...>>;
0156 template <class T>
0157 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17
0158 template <size_t I, class T> struct tuple_element; // undefined
0159 template <size_t I, class... T> struct tuple_element<I, tuple<T...>>;
0160 template <size_t I, class T>
0161 using tuple_element_t = typename tuple_element <I, T>::type; // C++14
0162
0163 // 20.4.1.5, element access:
0164 template <size_t I, class... T>
0165 typename tuple_element<I, tuple<T...>>::type&
0166 get(tuple<T...>&) noexcept; // constexpr in C++14
0167 template <size_t I, class... T>
0168 const typename tuple_element<I, tuple<T...>>::type&
0169 get(const tuple<T...>&) noexcept; // constexpr in C++14
0170 template <size_t I, class... T>
0171 typename tuple_element<I, tuple<T...>>::type&&
0172 get(tuple<T...>&&) noexcept; // constexpr in C++14
0173 template <size_t I, class... T>
0174 const typename tuple_element<I, tuple<T...>>::type&&
0175 get(const tuple<T...>&&) noexcept; // constexpr in C++14
0176
0177 template <class T1, class... T>
0178 constexpr T1& get(tuple<T...>&) noexcept; // C++14
0179 template <class T1, class... T>
0180 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14
0181 template <class T1, class... T>
0182 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14
0183 template <class T1, class... T>
0184 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14
0185
0186 // 20.4.1.6, relational operators:
0187 template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
0188 template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
0189 template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
0190 template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
0191 template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
0192 template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
0193 template<class... T, class... U>
0194 constexpr common_comparison_category_t<synth-three-way-result<T, U>...>
0195 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20
0196
0197 template <class... Types, class Alloc>
0198 struct uses_allocator<tuple<Types...>, Alloc>;
0199
0200 template <class... Types>
0201 void
0202 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y)));
0203
0204 template <class... Types>
0205 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23
0206
0207 } // std
0208
0209 */
0210
0211 // clang-format on
0212
0213 #if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
0214 # include <__cxx03/tuple>
0215 #else
0216 # include <__compare/common_comparison_category.h>
0217 # include <__compare/ordering.h>
0218 # include <__compare/synth_three_way.h>
0219 # include <__config>
0220 # include <__cstddef/size_t.h>
0221 # include <__fwd/array.h>
0222 # include <__fwd/pair.h>
0223 # include <__fwd/tuple.h>
0224 # include <__memory/allocator_arg_t.h>
0225 # include <__memory/uses_allocator.h>
0226 # include <__tuple/find_index.h>
0227 # include <__tuple/ignore.h>
0228 # include <__tuple/make_tuple_types.h>
0229 # include <__tuple/sfinae_helpers.h>
0230 # include <__tuple/tuple_element.h>
0231 # include <__tuple/tuple_indices.h>
0232 # include <__tuple/tuple_like_ext.h>
0233 # include <__tuple/tuple_size.h>
0234 # include <__tuple/tuple_types.h>
0235 # include <__type_traits/common_reference.h>
0236 # include <__type_traits/common_type.h>
0237 # include <__type_traits/conditional.h>
0238 # include <__type_traits/conjunction.h>
0239 # include <__type_traits/copy_cvref.h>
0240 # include <__type_traits/disjunction.h>
0241 # include <__type_traits/enable_if.h>
0242 # include <__type_traits/invoke.h>
0243 # include <__type_traits/is_arithmetic.h>
0244 # include <__type_traits/is_assignable.h>
0245 # include <__type_traits/is_constructible.h>
0246 # include <__type_traits/is_convertible.h>
0247 # include <__type_traits/is_empty.h>
0248 # include <__type_traits/is_final.h>
0249 # include <__type_traits/is_implicitly_default_constructible.h>
0250 # include <__type_traits/is_nothrow_assignable.h>
0251 # include <__type_traits/is_nothrow_constructible.h>
0252 # include <__type_traits/is_reference.h>
0253 # include <__type_traits/is_same.h>
0254 # include <__type_traits/is_swappable.h>
0255 # include <__type_traits/is_trivially_relocatable.h>
0256 # include <__type_traits/lazy.h>
0257 # include <__type_traits/maybe_const.h>
0258 # include <__type_traits/nat.h>
0259 # include <__type_traits/negation.h>
0260 # include <__type_traits/remove_cv.h>
0261 # include <__type_traits/remove_cvref.h>
0262 # include <__type_traits/remove_reference.h>
0263 # include <__type_traits/unwrap_ref.h>
0264 # include <__utility/declval.h>
0265 # include <__utility/forward.h>
0266 # include <__utility/integer_sequence.h>
0267 # include <__utility/move.h>
0268 # include <__utility/piecewise_construct.h>
0269 # include <__utility/swap.h>
0270 # include <version>
0271
0272 // standard-mandated includes
0273
0274 // [tuple.syn]
0275 # include <compare>
0276
0277 # if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0278 # pragma GCC system_header
0279 # endif
0280
0281 _LIBCPP_PUSH_MACROS
0282 # include <__undef_macros>
0283
0284 _LIBCPP_BEGIN_NAMESPACE_STD
0285
0286 # ifndef _LIBCPP_CXX03_LANG
0287
0288 // __tuple_leaf
0289
0290 template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value >
0291 class __tuple_leaf;
0292
0293 template <size_t _Ip, class _Hp, bool _Ep>
0294 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
0295 swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<_Hp>) {
0296 swap(__x.get(), __y.get());
0297 }
0298
0299 template <size_t _Ip, class _Hp, bool _Ep>
0300 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
0301 swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x,
0302 const __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<const _Hp>) {
0303 swap(__x.get(), __y.get());
0304 }
0305
0306 template <size_t _Ip, class _Hp, bool>
0307 class __tuple_leaf {
0308 _Hp __value_;
0309
0310 template <class _Tp>
0311 static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() {
0312 # if __has_keyword(__reference_binds_to_temporary)
0313 return !__reference_binds_to_temporary(_Hp, _Tp);
0314 # else
0315 return true;
0316 # endif
0317 }
0318
0319 public:
0320 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete;
0321
0322 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) : __value_() {
0323 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
0324 }
0325
0326 template <class _Alloc>
0327 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() {
0328 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
0329 }
0330
0331 template <class _Alloc>
0332 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
0333 : __value_(allocator_arg_t(), __a) {
0334 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
0335 }
0336
0337 template <class _Alloc>
0338 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) {
0339 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
0340 }
0341
0342 template <
0343 class _Tp,
0344 __enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, int> = 0>
0345 _LIBCPP_HIDE_FROM_ABI
0346 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value)
0347 : __value_(std::forward<_Tp>(__t)) {
0348 static_assert(__can_bind_reference<_Tp&&>(),
0349 "Attempted construction of reference element binds to a temporary whose lifetime has ended");
0350 }
0351
0352 template <class _Tp, class _Alloc>
0353 _LIBCPP_HIDE_FROM_ABI
0354 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
0355 : __value_(std::forward<_Tp>(__t)) {
0356 static_assert(__can_bind_reference<_Tp&&>(),
0357 "Attempted construction of reference element binds to a temporary whose lifetime has ended");
0358 }
0359
0360 template <class _Tp, class _Alloc>
0361 _LIBCPP_HIDE_FROM_ABI
0362 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
0363 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {
0364 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple");
0365 }
0366
0367 template <class _Tp, class _Alloc>
0368 _LIBCPP_HIDE_FROM_ABI
0369 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
0370 : __value_(std::forward<_Tp>(__t), __a) {
0371 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple");
0372 }
0373
0374 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default;
0375 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default;
0376
0377 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
0378 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) {
0379 std::swap(*this, __t);
0380 return 0;
0381 }
0382
0383 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const
0384 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) {
0385 std::swap(*this, __t);
0386 return 0;
0387 }
0388
0389 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; }
0390 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; }
0391 };
0392
0393 template <size_t _Ip, class _Hp>
0394 class __tuple_leaf<_Ip, _Hp, true> : private __remove_cv_t<_Hp> {
0395 public:
0396 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete;
0397
0398 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) {}
0399
0400 template <class _Alloc>
0401 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {}
0402
0403 template <class _Alloc>
0404 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
0405 : _Hp(allocator_arg_t(), __a) {}
0406
0407 template <class _Alloc>
0408 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {}
0409
0410 template <class _Tp,
0411 __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value,
0412 int> = 0>
0413 _LIBCPP_HIDE_FROM_ABI
0414 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value)
0415 : _Hp(std::forward<_Tp>(__t)) {}
0416
0417 template <class _Tp, class _Alloc>
0418 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
0419 : _Hp(std::forward<_Tp>(__t)) {}
0420
0421 template <class _Tp, class _Alloc>
0422 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
0423 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {}
0424
0425 template <class _Tp, class _Alloc>
0426 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
0427 : _Hp(std::forward<_Tp>(__t), __a) {}
0428
0429 __tuple_leaf(__tuple_leaf const&) = default;
0430 __tuple_leaf(__tuple_leaf&&) = default;
0431
0432 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
0433 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) {
0434 std::swap(*this, __t);
0435 return 0;
0436 }
0437
0438 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const
0439 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) {
0440 std::swap(*this, __rhs);
0441 return 0;
0442 }
0443
0444 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); }
0445 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT {
0446 return static_cast<const _Hp&>(*this);
0447 }
0448 };
0449
0450 template <class... _Tp>
0451 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {}
0452
0453 template <class _Tp>
0454 struct __all_default_constructible;
0455
0456 template <class... _Tp>
0457 struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {};
0458
0459 // __tuple_impl
0460
0461 template <class _Indx, class... _Tp>
0462 struct __tuple_impl;
0463
0464 template <size_t... _Indx, class... _Tp>
0465 struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
0466 : public __tuple_leaf<_Indx, _Tp>... {
0467 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept(
0468 __all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
0469
0470 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
0471 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
0472 __tuple_indices<_Uf...>,
0473 __tuple_types<_Tf...>,
0474 __tuple_indices<_Ul...>,
0475 __tuple_types<_Tl...>,
0476 _Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
0477 __all<is_nothrow_default_constructible<_Tl>::value...>::value)
0478 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {}
0479
0480 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
0481 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
0482 allocator_arg_t,
0483 const _Alloc& __a,
0484 __tuple_indices<_Uf...>,
0485 __tuple_types<_Tf...>,
0486 __tuple_indices<_Ul...>,
0487 __tuple_types<_Tl...>,
0488 _Up&&... __u)
0489 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))...,
0490 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {}
0491
0492 template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0>
0493 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) noexcept(
0494 (__all<is_nothrow_constructible<
0495 _Tp,
0496 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
0497 : __tuple_leaf<_Indx, _Tp>(
0498 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(
0499 std::get<_Indx>(__t)))... {}
0500
0501 template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0>
0502 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
0503 : __tuple_leaf<_Indx, _Tp>(
0504 __uses_alloc_ctor<_Tp,
0505 _Alloc,
0506 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(),
0507 __a,
0508 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(
0509 std::get<_Indx>(__t)))... {}
0510
0511 __tuple_impl(const __tuple_impl&) = default;
0512 __tuple_impl(__tuple_impl&&) = default;
0513
0514 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
0515 swap(__tuple_impl& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
0516 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...);
0517 }
0518
0519 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const
0520 noexcept(__all<__is_nothrow_swappable_v<const _Tp>...>::value) {
0521 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...);
0522 }
0523 };
0524
0525 template <class _Dest, class _Source, size_t... _Np>
0526 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
0527 __memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) {
0528 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...);
0529 }
0530
0531 template <class _Dest, class _Source, class... _Up, size_t... _Np>
0532 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
0533 __memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) {
0534 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...);
0535 }
0536
0537 template <class... _Tp>
0538 class _LIBCPP_TEMPLATE_VIS tuple {
0539 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT;
0540
0541 _BaseT __base_;
0542
0543 template <size_t _Jp, class... _Up>
0544 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
0545 template <size_t _Jp, class... _Up>
0546 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&
0547 get(const tuple<_Up...>&) _NOEXCEPT;
0548 template <size_t _Jp, class... _Up>
0549 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&&
0550 get(tuple<_Up...>&&) _NOEXCEPT;
0551 template <size_t _Jp, class... _Up>
0552 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&&
0553 get(const tuple<_Up...>&&) _NOEXCEPT;
0554
0555 public:
0556 using __trivially_relocatable _LIBCPP_NODEBUG =
0557 __conditional_t<_And<__libcpp_is_trivially_relocatable<_Tp>...>::value, tuple, void>;
0558
0559 // [tuple.cnstr]
0560
0561 // tuple() constructors (including allocator_arg_t variants)
0562 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible,
0563 template <class...> class _IsDefault = is_default_constructible,
0564 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0>
0565 _LIBCPP_HIDE_FROM_ABI constexpr explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value)
0566 tuple() noexcept(_And<is_nothrow_default_constructible<_Tp>...>::value) {}
0567
0568 template <class _Alloc,
0569 template <class...> class _IsImpDefault = __is_implicitly_default_constructible,
0570 template <class...> class _IsDefault = is_default_constructible,
0571 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0>
0572 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value)
0573 tuple(allocator_arg_t, _Alloc const& __a)
0574 : __base_(allocator_arg_t(),
0575 __a,
0576 __tuple_indices<>(),
0577 __tuple_types<>(),
0578 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
0579 __tuple_types<_Tp...>()) {}
0580
0581 // tuple(const T&...) constructors (including allocator_arg_t variants)
0582 template <template <class...> class _And = _And,
0583 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0>
0584 _LIBCPP_HIDE_FROM_ABI
0585 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
0586 tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value)
0587 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
0588 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
0589 typename __make_tuple_indices<0>::type(),
0590 typename __make_tuple_types<tuple, 0>::type(),
0591 __t...) {}
0592
0593 template <class _Alloc,
0594 template <class...> class _And = _And,
0595 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0>
0596 _LIBCPP_HIDE_FROM_ABI
0597 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
0598 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t)
0599 : __base_(allocator_arg_t(),
0600 __a,
0601 typename __make_tuple_indices<sizeof...(_Tp)>::type(),
0602 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
0603 typename __make_tuple_indices<0>::type(),
0604 typename __make_tuple_types<tuple, 0>::type(),
0605 __t...) {}
0606
0607 // tuple(U&& ...) constructors (including allocator_arg_t variants)
0608 template <class... _Up>
0609 struct _IsThisTuple : false_type {};
0610 template <class _Up>
0611 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {};
0612
0613 template <class... _Up>
0614 struct _EnableUTypesCtor
0615 : _And< _BoolConstant<sizeof...(_Tp) >= 1>,
0616 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors
0617 is_constructible<_Tp, _Up>... > {};
0618
0619 template <class... _Up,
0620 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value,
0621 int> = 0>
0622 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
0623 tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
0624 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
0625 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
0626 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
0627 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
0628 std::forward<_Up>(__u)...) {}
0629
0630 template <class _Alloc,
0631 class... _Up,
0632 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value,
0633 int> = 0>
0634 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
0635 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
0636 : __base_(allocator_arg_t(),
0637 __a,
0638 typename __make_tuple_indices<sizeof...(_Up)>::type(),
0639 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
0640 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
0641 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
0642 std::forward<_Up>(__u)...) {}
0643
0644 // Copy and move constructors (including the allocator_arg_t variants)
0645 tuple(const tuple&) = default;
0646 tuple(tuple&&) = default;
0647
0648 template <class _Alloc,
0649 template <class...> class _And = _And,
0650 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0>
0651 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t)
0652 : __base_(allocator_arg_t(), __alloc, __t) {}
0653
0654 template <class _Alloc,
0655 template <class...> class _And = _And,
0656 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0>
0657 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t)
0658 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
0659
0660 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants)
0661
0662 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void>
0663 struct _EnableCtorFromUTypesTuple : false_type {};
0664
0665 template <class _OtherTuple, class... _Up>
0666 struct _EnableCtorFromUTypesTuple<
0667 _OtherTuple,
0668 tuple<_Up...>,
0669 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below
0670 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>>
0671 : _And<
0672 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor
0673 // can work. Otherwise, is_constructible can trigger hard error in those cases
0674 // https://godbolt.org/z/M94cGdKcE
0675 _Not<is_same<_OtherTuple, const tuple&> >,
0676 _Not<is_same<_OtherTuple, tuple&&> >,
0677 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >...,
0678 _Lazy<_Or,
0679 _BoolConstant<sizeof...(_Tp) != 1>,
0680 // _Tp and _Up are 1-element packs - the pack expansions look
0681 // weird to avoid tripping up the type traits in degenerate cases
0682 _Lazy<_And,
0683 _Not<is_same<_Tp, _Up> >...,
0684 _Not<is_convertible<_OtherTuple, _Tp> >...,
0685 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {};
0686
0687 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0>
0688 _LIBCPP_HIDE_FROM_ABI
0689 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value)
0690 tuple(const tuple<_Up...>& __t) noexcept(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)
0691 : __base_(__t) {}
0692
0693 template <class... _Up,
0694 class _Alloc,
0695 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0>
0696 _LIBCPP_HIDE_FROM_ABI
0697 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value)
0698 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t)
0699 : __base_(allocator_arg_t(), __a, __t) {}
0700
0701 # if _LIBCPP_STD_VER >= 23
0702 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants)
0703
0704 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr>
0705 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t)
0706 : __base_(__t) {}
0707
0708 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr>
0709 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value)
0710 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t)
0711 : __base_(allocator_arg_t(), __alloc, __t) {}
0712 # endif // _LIBCPP_STD_VER >= 23
0713
0714 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants)
0715 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0>
0716 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
0717 tuple(tuple<_Up...>&& __t) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
0718 : __base_(std::move(__t)) {}
0719
0720 template <class _Alloc,
0721 class... _Up,
0722 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0>
0723 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
0724 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t)
0725 : __base_(allocator_arg_t(), __a, std::move(__t)) {}
0726
0727 # if _LIBCPP_STD_VER >= 23
0728 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants)
0729
0730 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr>
0731 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value)
0732 tuple(const tuple<_Up...>&& __t)
0733 : __base_(std::move(__t)) {}
0734
0735 template <class _Alloc,
0736 class... _Up,
0737 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr>
0738 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value)
0739 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t)
0740 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
0741 # endif // _LIBCPP_STD_VER >= 23
0742
0743 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants)
0744
0745 template <template <class...> class _Pred,
0746 class _Pair,
0747 class _DecayedPair = __remove_cvref_t<_Pair>,
0748 class _Tuple = tuple>
0749 struct _CtorPredicateFromPair : false_type {};
0750
0751 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
0752 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
0753 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {};
0754
0755 template <class _Pair>
0756 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {};
0757
0758 template <class _Pair>
0759 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {};
0760
0761 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple>
0762 struct _BothImplicitlyConvertible : false_type {};
0763
0764 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
0765 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
0766 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {};
0767
0768 template <class _Up1,
0769 class _Up2,
0770 template <class...> class _And = _And,
0771 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0>
0772 _LIBCPP_HIDE_FROM_ABI
0773 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value)
0774 tuple(const pair<_Up1, _Up2>& __p) noexcept(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)
0775 : __base_(__p) {}
0776
0777 template <class _Alloc,
0778 class _Up1,
0779 class _Up2,
0780 template <class...> class _And = _And,
0781 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0>
0782 _LIBCPP_HIDE_FROM_ABI
0783 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value)
0784 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p)
0785 : __base_(allocator_arg_t(), __a, __p) {}
0786
0787 # if _LIBCPP_STD_VER >= 23
0788 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants)
0789
0790 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr>
0791 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value)
0792 tuple(pair<_U1, _U2>& __p)
0793 : __base_(__p) {}
0794
0795 template <class _Alloc,
0796 class _U1,
0797 class _U2,
0798 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr>
0799 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value)
0800 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p)
0801 : __base_(allocator_arg_t(), __alloc, __p) {}
0802 # endif
0803
0804 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants)
0805
0806 template <class _Up1,
0807 class _Up2,
0808 template <class...> class _And = _And,
0809 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0>
0810 _LIBCPP_HIDE_FROM_ABI
0811 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value)
0812 tuple(pair<_Up1, _Up2>&& __p) noexcept(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)
0813 : __base_(std::move(__p)) {}
0814
0815 template <class _Alloc,
0816 class _Up1,
0817 class _Up2,
0818 template <class...> class _And = _And,
0819 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0>
0820 _LIBCPP_HIDE_FROM_ABI
0821 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value)
0822 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p)
0823 : __base_(allocator_arg_t(), __a, std::move(__p)) {}
0824
0825 # if _LIBCPP_STD_VER >= 23
0826 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants)
0827
0828 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr>
0829 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
0830 tuple(const pair<_U1, _U2>&& __p)
0831 : __base_(std::move(__p)) {}
0832
0833 template <class _Alloc,
0834 class _U1,
0835 class _U2,
0836 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr>
0837 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
0838 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p)
0839 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {}
0840 # endif // _LIBCPP_STD_VER >= 23
0841
0842 // [tuple.assign]
0843 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0844 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) noexcept(
0845 _And<is_nothrow_copy_assignable<_Tp>...>::value) {
0846 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
0847 return *this;
0848 }
0849
0850 # if _LIBCPP_STD_VER >= 23
0851 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const
0852 requires(_And<is_copy_assignable<const _Tp>...>::value)
0853 {
0854 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
0855 return *this;
0856 }
0857
0858 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const
0859 requires(_And<is_assignable<const _Tp&, _Tp>...>::value)
0860 {
0861 std::__memberwise_forward_assign(
0862 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
0863 return *this;
0864 }
0865 # endif // _LIBCPP_STD_VER >= 23
0866
0867 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0868 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) noexcept(
0869 _And<is_nothrow_move_assignable<_Tp>...>::value) {
0870 std::__memberwise_forward_assign(
0871 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
0872 return *this;
0873 }
0874
0875 template <
0876 class... _Up,
0877 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value,
0878 int> = 0>
0879 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0880 operator=(tuple<_Up...> const& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
0881 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
0882 return *this;
0883 }
0884
0885 template <class... _Up,
0886 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value,
0887 int> = 0>
0888 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0889 operator=(tuple<_Up...>&& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
0890 std::__memberwise_forward_assign(
0891 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
0892 return *this;
0893 }
0894
0895 # if _LIBCPP_STD_VER >= 23
0896 template <class... _UTypes,
0897 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
0898 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr>
0899 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const {
0900 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type());
0901 return *this;
0902 }
0903
0904 template <class... _UTypes,
0905 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
0906 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr>
0907 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const {
0908 std::__memberwise_forward_assign(
0909 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
0910 return *this;
0911 }
0912 # endif // _LIBCPP_STD_VER >= 23
0913
0914 template <template <class...> class _Pred,
0915 bool _Const,
0916 class _Pair,
0917 class _DecayedPair = __remove_cvref_t<_Pair>,
0918 class _Tuple = tuple>
0919 struct _AssignPredicateFromPair : false_type {};
0920
0921 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
0922 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
0923 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >,
0924 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {};
0925
0926 template <bool _Const, class _Pair>
0927 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {};
0928
0929 template <bool _Const, class _Pair>
0930 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {};
0931
0932 # if _LIBCPP_STD_VER >= 23
0933 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr>
0934 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const
0935 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) {
0936 std::get<0>(*this) = __pair.first;
0937 std::get<1>(*this) = __pair.second;
0938 return *this;
0939 }
0940
0941 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr>
0942 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const
0943 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) {
0944 std::get<0>(*this) = std::move(__pair.first);
0945 std::get<1>(*this) = std::move(__pair.second);
0946 return *this;
0947 }
0948 # endif // _LIBCPP_STD_VER >= 23
0949
0950 template <class _Up1,
0951 class _Up2,
0952 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0>
0953 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0954 operator=(pair<_Up1, _Up2> const& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) {
0955 std::get<0>(*this) = __pair.first;
0956 std::get<1>(*this) = __pair.second;
0957 return *this;
0958 }
0959
0960 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0>
0961 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0962 operator=(pair<_Up1, _Up2>&& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) {
0963 std::get<0>(*this) = std::forward<_Up1>(__pair.first);
0964 std::get<1>(*this) = std::forward<_Up2>(__pair.second);
0965 return *this;
0966 }
0967
0968 // EXTENSION
0969 template <
0970 class _Up,
0971 size_t _Np,
0972 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0>
0973 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0974 operator=(array<_Up, _Np> const& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
0975 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type());
0976 return *this;
0977 }
0978
0979 // EXTENSION
0980 template <class _Up,
0981 size_t _Np,
0982 class = void,
0983 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0>
0984 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
0985 operator=(array<_Up, _Np>&& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
0986 std::__memberwise_forward_assign(
0987 *this,
0988 std::move(__array),
0989 __tuple_types<_If<true, _Up, _Tp>...>(),
0990 typename __make_tuple_indices<sizeof...(_Tp)>::type());
0991 return *this;
0992 }
0993
0994 // [tuple.swap]
0995 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
0996 swap(tuple& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
0997 __base_.swap(__t.__base_);
0998 }
0999
1000 # if _LIBCPP_STD_VER >= 23
1001 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const
1002 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) {
1003 __base_.swap(__t.__base_);
1004 }
1005 # endif // _LIBCPP_STD_VER >= 23
1006 };
1007
1008 template <>
1009 class _LIBCPP_TEMPLATE_VIS tuple<> {
1010 public:
1011 constexpr tuple() _NOEXCEPT = default;
1012 template <class _Alloc>
1013 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
1014 template <class _Alloc>
1015 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {}
1016 template <class _Up>
1017 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {}
1018 template <class _Alloc, class _Up>
1019 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
1020 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {}
1021 # if _LIBCPP_STD_VER >= 23
1022 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {}
1023 # endif
1024 };
1025
1026 # if _LIBCPP_STD_VER >= 23
1027 template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual>
1028 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; }
1029 struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> {
1030 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>;
1031 };
1032
1033 template <class... _TTypes, class... _UTypes>
1034 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; }
1035 struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> {
1036 using type = tuple<common_type_t<_TTypes, _UTypes>...>;
1037 };
1038 # endif // _LIBCPP_STD_VER >= 23
1039
1040 # if _LIBCPP_STD_VER >= 17
1041 template <class... _Tp>
1042 tuple(_Tp...) -> tuple<_Tp...>;
1043 template <class _Tp1, class _Tp2>
1044 tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
1045 template <class _Alloc, class... _Tp>
1046 tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>;
1047 template <class _Alloc, class _Tp1, class _Tp2>
1048 tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
1049 template <class _Alloc, class... _Tp>
1050 tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>;
1051 # endif
1052
1053 template <class... _Tp, __enable_if_t<__all<__is_swappable_v<_Tp>...>::value, int> = 0>
1054 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
1055 swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
1056 __t.swap(__u);
1057 }
1058
1059 # if _LIBCPP_STD_VER >= 23
1060 template <class... _Tp>
1061 _LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void>
1062 swap(const tuple<_Tp...>& __lhs,
1063 const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) {
1064 __lhs.swap(__rhs);
1065 }
1066 # endif
1067
1068 // get
1069
1070 template <size_t _Ip, class... _Tp>
1071 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&
1072 get(tuple<_Tp...>& __t) _NOEXCEPT {
1073 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type;
1074 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get();
1075 }
1076
1077 template <size_t _Ip, class... _Tp>
1078 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
1079 get(const tuple<_Tp...>& __t) _NOEXCEPT {
1080 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type;
1081 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get();
1082 }
1083
1084 template <size_t _Ip, class... _Tp>
1085 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
1086 get(tuple<_Tp...>&& __t) _NOEXCEPT {
1087 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type;
1088 return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get());
1089 }
1090
1091 template <size_t _Ip, class... _Tp>
1092 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
1093 get(const tuple<_Tp...>&& __t) _NOEXCEPT {
1094 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type;
1095 return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get());
1096 }
1097
1098 # if _LIBCPP_STD_VER >= 14
1099
1100 template <class _T1, class... _Args>
1101 inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept {
1102 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
1103 }
1104
1105 template <class _T1, class... _Args>
1106 inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept {
1107 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
1108 }
1109
1110 template <class _T1, class... _Args>
1111 inline _LIBCPP_HIDE_FROM_ABI constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept {
1112 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup));
1113 }
1114
1115 template <class _T1, class... _Args>
1116 inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept {
1117 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup));
1118 }
1119
1120 # endif
1121
1122 // tie
1123
1124 template <class... _Tp>
1125 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT {
1126 return tuple<_Tp&...>(__t...);
1127 }
1128
1129 template <class... _Tp>
1130 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<__unwrap_ref_decay_t<_Tp>...>
1131 make_tuple(_Tp&&... __t) {
1132 return tuple<__unwrap_ref_decay_t<_Tp>...>(std::forward<_Tp>(__t)...);
1133 }
1134
1135 template <class... _Tp>
1136 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT {
1137 return tuple<_Tp&&...>(std::forward<_Tp>(__t)...);
1138 }
1139
1140 template <size_t _Ip>
1141 struct __tuple_equal {
1142 template <class _Tp, class _Up>
1143 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) {
1144 return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y);
1145 }
1146 };
1147
1148 template <>
1149 struct __tuple_equal<0> {
1150 template <class _Tp, class _Up>
1151 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) {
1152 return true;
1153 }
1154 };
1155
1156 template <class... _Tp, class... _Up>
1157 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1158 operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1159 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
1160 return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
1161 }
1162
1163 # if _LIBCPP_STD_VER >= 20
1164
1165 // operator<=>
1166
1167 template <class... _Tp, class... _Up, size_t... _Is>
1168 _LIBCPP_HIDE_FROM_ABI constexpr auto
1169 __tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) {
1170 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal;
1171 static_cast<void>(
1172 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...));
1173 return __result;
1174 }
1175
1176 template <class... _Tp, class... _Up>
1177 requires(sizeof...(_Tp) == sizeof...(_Up))
1178 _LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...>
1179 operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1180 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{});
1181 }
1182
1183 # else // _LIBCPP_STD_VER >= 20
1184
1185 template <class... _Tp, class... _Up>
1186 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1187 operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1188 return !(__x == __y);
1189 }
1190
1191 template <size_t _Ip>
1192 struct __tuple_less {
1193 template <class _Tp, class _Up>
1194 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) {
1195 const size_t __idx = tuple_size<_Tp>::value - _Ip;
1196 if (std::get<__idx>(__x) < std::get<__idx>(__y))
1197 return true;
1198 if (std::get<__idx>(__y) < std::get<__idx>(__x))
1199 return false;
1200 return __tuple_less<_Ip - 1>()(__x, __y);
1201 }
1202 };
1203
1204 template <>
1205 struct __tuple_less<0> {
1206 template <class _Tp, class _Up>
1207 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) {
1208 return false;
1209 }
1210 };
1211
1212 template <class... _Tp, class... _Up>
1213 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1214 operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1215 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
1216 return __tuple_less<sizeof...(_Tp)>()(__x, __y);
1217 }
1218
1219 template <class... _Tp, class... _Up>
1220 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1221 operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1222 return __y < __x;
1223 }
1224
1225 template <class... _Tp, class... _Up>
1226 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1227 operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1228 return !(__x < __y);
1229 }
1230
1231 template <class... _Tp, class... _Up>
1232 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1233 operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1234 return !(__y < __x);
1235 }
1236
1237 # endif // _LIBCPP_STD_VER >= 20
1238
1239 // tuple_cat
1240
1241 template <class _Tp, class _Up>
1242 struct __tuple_cat_type;
1243
1244 template <class... _Ttypes, class... _Utypes>
1245 struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > {
1246 using type _LIBCPP_NODEBUG = tuple<_Ttypes..., _Utypes...>;
1247 };
1248
1249 template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples>
1250 struct __tuple_cat_return_1 {};
1251
1252 template <class... _Types, class _Tuple0>
1253 struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> {
1254 using type _LIBCPP_NODEBUG =
1255 typename __tuple_cat_type< tuple<_Types...>,
1256 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type;
1257 };
1258
1259 template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples>
1260 struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...>
1261 : public __tuple_cat_return_1<
1262 typename __tuple_cat_type< tuple<_Types...>,
1263 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type,
1264 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value,
1265 _Tuple1,
1266 _Tuples...> {};
1267
1268 template <class... _Tuples>
1269 struct __tuple_cat_return;
1270
1271 template <class _Tuple0, class... _Tuples>
1272 struct __tuple_cat_return<_Tuple0, _Tuples...>
1273 : public __tuple_cat_return_1<tuple<>,
1274 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value,
1275 _Tuple0,
1276 _Tuples...> {};
1277
1278 template <>
1279 struct __tuple_cat_return<> {
1280 using type _LIBCPP_NODEBUG = tuple<>;
1281 };
1282
1283 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); }
1284
1285 template <class _Rp, class _Indices, class _Tuple0, class... _Tuples>
1286 struct __tuple_cat_return_ref_imp;
1287
1288 template <class... _Types, size_t... _I0, class _Tuple0>
1289 struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> {
1290 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
1291 typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type;
1292 };
1293
1294 template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples>
1295 struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...>
1296 : public __tuple_cat_return_ref_imp<
1297 tuple<_Types...,
1298 __copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>,
1299 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type,
1300 _Tuple1,
1301 _Tuples...> {};
1302
1303 template <class _Tuple0, class... _Tuples>
1304 struct __tuple_cat_return_ref
1305 : public __tuple_cat_return_ref_imp<
1306 tuple<>,
1307 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type,
1308 _Tuple0,
1309 _Tuples...> {};
1310
1311 template <class _Types, class _I0, class _J0>
1312 struct __tuple_cat;
1313
1314 template <class... _Types, size_t... _I0, size_t... _J0>
1315 struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > {
1316 template <class _Tuple0>
1317 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
1318 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
1319 operator()(tuple<_Types...> __t, _Tuple0&& __t0) {
1320 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty
1321 return std::forward_as_tuple(
1322 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...);
1323 }
1324
1325 template <class _Tuple0, class _Tuple1, class... _Tuples>
1326 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
1327 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
1328 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) {
1329 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty
1330 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
1331 using _T1 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple1>;
1332 return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>,
1333 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type,
1334 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()(
1335 std::forward_as_tuple(
1336 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...),
1337 std::forward<_Tuple1>(__t1),
1338 std::forward<_Tuples>(__tpls)...);
1339 }
1340 };
1341
1342 template <class _TupleDst, class _TupleSrc, size_t... _Indices>
1343 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _TupleDst
1344 __tuple_cat_select_element_wise(_TupleSrc&& __src, __tuple_indices<_Indices...>) {
1345 static_assert(tuple_size<_TupleDst>::value == tuple_size<_TupleSrc>::value,
1346 "misuse of __tuple_cat_select_element_wise with tuples of different sizes");
1347 return _TupleDst(std::get<_Indices>(std::forward<_TupleSrc>(__src))...);
1348 }
1349
1350 template <class _Tuple0, class... _Tuples>
1351 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type
1352 tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) {
1353 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
1354 using _TRet _LIBCPP_NODEBUG = typename __tuple_cat_return<_Tuple0, _Tuples...>::type;
1355 using _T0Indices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_T0>::value>::type;
1356 using _TRetIndices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_TRet>::value>::type;
1357 return std::__tuple_cat_select_element_wise<_TRet>(
1358 __tuple_cat<tuple<>, __tuple_indices<>, _T0Indices>()(
1359 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...),
1360 _TRetIndices());
1361 }
1362
1363 template <class... _Tp, class _Alloc>
1364 struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {};
1365
1366 # if _LIBCPP_STD_VER >= 17
1367 # define _LIBCPP_NOEXCEPT_RETURN(...) \
1368 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; }
1369
1370 // The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting.
1371 // clang-format off
1372 template <class _Fn, class _Tuple, size_t... _Id>
1373 inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto)
1374 __apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>)
1375 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...))
1376
1377 template <class _Fn, class _Tuple>
1378 inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t)
1379 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl(
1380 std::forward<_Fn>(__f),
1381 std::forward<_Tuple>(__t),
1382 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
1383
1384 #if _LIBCPP_STD_VER >= 20
1385 template <class _Tp, class _Tuple, size_t... _Idx>
1386 inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>)
1387 noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)))
1388 requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> {
1389 return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...);
1390 }
1391 #else
1392 template <class _Tp, class _Tuple, size_t... _Idx>
1393 inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>,
1394 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr)
1395 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))
1396 #endif // _LIBCPP_STD_VER >= 20
1397
1398 template <class _Tp, class _Tuple,
1399 class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void>
1400 inline constexpr bool __can_make_from_tuple = false;
1401
1402 template <class _Tp, class _Tuple, size_t... _Idx>
1403 inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>,
1404 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true;
1405
1406 // Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9,
1407 // the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple
1408 // SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl
1409 // so that std::__make_from_tuple_impl will have the same advantages when used alone.
1410 #if _LIBCPP_STD_VER >= 20
1411 template <class _Tp, class _Tuple>
1412 requires __can_make_from_tuple<_Tp, _Tuple> // strengthen
1413 #else
1414 template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen
1415 #endif // _LIBCPP_STD_VER >= 20
1416 inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t)
1417 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>(
1418 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
1419 # undef _LIBCPP_NOEXCEPT_RETURN
1420
1421 # endif // _LIBCPP_STD_VER >= 17
1422
1423 #endif // !defined(_LIBCPP_CXX03_LANG)
1424
1425 _LIBCPP_END_NAMESPACE_STD
1426
1427 _LIBCPP_POP_MACROS
1428
1429 // clang-format on
1430
1431 # if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
1432 # include <cstddef>
1433 # include <exception>
1434 # include <iosfwd>
1435 # include <new>
1436 # include <type_traits>
1437 # include <typeinfo>
1438 # include <utility>
1439 # endif
1440 #endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
1441
1442 #endif // _LIBCPP_TUPLE
