master
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_TUPLE
11#define _LIBCPP_TUPLE
12
13// clang-format off
14
15/*
16 tuple synopsis
17
18namespace std
19{
20
21template <class... T>
22class tuple {
23public:
24 explicit(see-below) constexpr tuple();
25 explicit(see-below) tuple(const T&...); // constexpr in C++14
26 template <class... U>
27 explicit(see-below) tuple(U&&...); // constexpr in C++14
28 tuple(const tuple&) = default;
29 tuple(tuple&&) = default;
30
31 template<class... UTypes>
32 constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23
33 template <class... U>
34 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14
35 template <class... U>
36 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14
37 template<class... UTypes>
38 constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23
39
40 template<class U1, class U2>
41 constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23
42 template <class U1, class U2>
43 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
44 template <class U1, class U2>
45 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14
46 template<class U1, class U2>
47 constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23
48
49 // allocator-extended constructors
50 template <class Alloc>
51 tuple(allocator_arg_t, const Alloc& a);
52 template <class Alloc>
53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20
54 template <class Alloc, class... U>
55 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20
56 template <class Alloc>
57 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20
58 template <class Alloc>
59 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20
60 template<class Alloc, class... UTypes>
61 constexpr explicit(see-below)
62 tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23
63 template <class Alloc, class... U>
64 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20
65 template <class Alloc, class... U>
66 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20
67 template<class Alloc, class... UTypes>
68 constexpr explicit(see-below)
69 tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23
70 template<class Alloc, class U1, class U2>
71 constexpr explicit(see-below)
72 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23
73 template <class Alloc, class U1, class U2>
74 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20
75 template <class Alloc, class U1, class U2>
76 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20
77 template<class Alloc, class U1, class U2>
78 constexpr explicit(see-below)
79 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23
80
81 tuple& operator=(const tuple&); // constexpr in C++20
82 constexpr const tuple& operator=(const tuple&) const; // C++23
83 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20
84 constexpr const tuple& operator=(tuple&&) const; // C++23
85 template <class... U>
86 tuple& operator=(const tuple<U...>&); // constexpr in C++20
87 template<class... UTypes>
88 constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23
89 template <class... U>
90 tuple& operator=(tuple<U...>&&); // constexpr in C++20
91 template<class... UTypes>
92 constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23
93 template <class U1, class U2>
94 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20
95 template<class U1, class U2>
96 constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23
97 template <class U1, class U2>
98 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20
99 template<class U1, class U2>
100 constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23
101
102 template<class U, size_t N>
103 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION
104 template<class U, size_t N>
105 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION
106
107 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20
108 constexpr void swap(const tuple&) const noexcept(see-below); // C++23
109};
110
111
112template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23
113 requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; }
114struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> {
115 using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>;
116};
117
118template<class... TTypes, class... UTypes> // since C++23
119 requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; }
120struct common_type<tuple<TTypes...>, tuple<UTypes...>> {
121 using type = tuple<common_type_t<TTypes, UTypes>...>;
122};
123
124template <class ...T>
125tuple(T...) -> tuple<T...>; // since C++17
126template <class T1, class T2>
127tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17
128template <class Alloc, class ...T>
129tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17
130template <class Alloc, class T1, class T2>
131tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17
132template <class Alloc, class ...T>
133tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17
134
135struct ignore-type { // exposition only // Since C++26
136 constexpr const ignore-type&
137 operator=(const auto &) const noexcept
138 { return *this; }
139};
140inline constexpr ignore-type ignore;
141
142template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
143template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
144template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
145template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
146
147// [tuple.apply], calling a function with a tuple of arguments:
148template <class F, class Tuple>
149 constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23
150template <class T, class Tuple>
151 constexpr T make_from_tuple(Tuple&& t); // C++17
152
153// 20.4.1.4, tuple helper classes:
154template <class T> struct tuple_size; // undefined
155template <class... T> struct tuple_size<tuple<T...>>;
156template <class T>
157 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17
158template <size_t I, class T> struct tuple_element; // undefined
159template <size_t I, class... T> struct tuple_element<I, tuple<T...>>;
160template <size_t I, class T>
161 using tuple_element_t = typename tuple_element <I, T>::type; // C++14
162
163// 20.4.1.5, element access:
164template <size_t I, class... T>
165 typename tuple_element<I, tuple<T...>>::type&
166 get(tuple<T...>&) noexcept; // constexpr in C++14
167template <size_t I, class... T>
168 const typename tuple_element<I, tuple<T...>>::type&
169 get(const tuple<T...>&) noexcept; // constexpr in C++14
170template <size_t I, class... T>
171 typename tuple_element<I, tuple<T...>>::type&&
172 get(tuple<T...>&&) noexcept; // constexpr in C++14
173template <size_t I, class... T>
174 const typename tuple_element<I, tuple<T...>>::type&&
175 get(const tuple<T...>&&) noexcept; // constexpr in C++14
176
177template <class T1, class... T>
178 constexpr T1& get(tuple<T...>&) noexcept; // C++14
179template <class T1, class... T>
180 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14
181template <class T1, class... T>
182 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14
183template <class T1, class... T>
184 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14
185
186// 20.4.1.6, relational operators:
187template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
188template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
189template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
190template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
191template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
192template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
193template<class... T, class... U>
194 constexpr common_comparison_category_t<synth-three-way-result<T, U>...>
195 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20
196
197template <class... Types, class Alloc>
198 struct uses_allocator<tuple<Types...>, Alloc>;
199
200template <class... Types>
201 void
202 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y)));
203
204template <class... Types>
205 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23
206
207} // std
208
209*/
210
211// clang-format on
212
213#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
214# include <__cxx03/__config>
215#else
216# include <__compare/common_comparison_category.h>
217# include <__compare/ordering.h>
218# include <__compare/synth_three_way.h>
219# include <__concepts/boolean_testable.h>
220# include <__config>
221# include <__cstddef/size_t.h>
222# include <__fwd/array.h>
223# include <__fwd/pair.h>
224# include <__fwd/tuple.h>
225# include <__memory/allocator_arg_t.h>
226# include <__memory/uses_allocator.h>
227# include <__tuple/find_index.h>
228# include <__tuple/ignore.h>
229# include <__tuple/make_tuple_types.h>
230# include <__tuple/sfinae_helpers.h>
231# include <__tuple/tuple_element.h>
232# include <__tuple/tuple_indices.h>
233# include <__tuple/tuple_like_ext.h>
234# include <__tuple/tuple_size.h>
235# include <__tuple/tuple_types.h>
236# include <__type_traits/common_reference.h>
237# include <__type_traits/common_type.h>
238# include <__type_traits/conditional.h>
239# include <__type_traits/conjunction.h>
240# include <__type_traits/copy_cvref.h>
241# include <__type_traits/disjunction.h>
242# include <__type_traits/enable_if.h>
243# include <__type_traits/invoke.h>
244# include <__type_traits/is_arithmetic.h>
245# include <__type_traits/is_assignable.h>
246# include <__type_traits/is_constructible.h>
247# include <__type_traits/is_convertible.h>
248# include <__type_traits/is_empty.h>
249# include <__type_traits/is_final.h>
250# include <__type_traits/is_implicitly_default_constructible.h>
251# include <__type_traits/is_nothrow_assignable.h>
252# include <__type_traits/is_nothrow_constructible.h>
253# include <__type_traits/is_reference.h>
254# include <__type_traits/is_replaceable.h>
255# include <__type_traits/is_same.h>
256# include <__type_traits/is_swappable.h>
257# include <__type_traits/is_trivially_relocatable.h>
258# include <__type_traits/lazy.h>
259# include <__type_traits/maybe_const.h>
260# include <__type_traits/nat.h>
261# include <__type_traits/negation.h>
262# include <__type_traits/reference_constructs_from_temporary.h>
263# include <__type_traits/remove_cv.h>
264# include <__type_traits/remove_cvref.h>
265# include <__type_traits/remove_reference.h>
266# include <__type_traits/unwrap_ref.h>
267# include <__utility/declval.h>
268# include <__utility/forward.h>
269# include <__utility/integer_sequence.h>
270# include <__utility/move.h>
271# include <__utility/piecewise_construct.h>
272# include <__utility/swap.h>
273# include <version>
274
275// standard-mandated includes
276
277// [tuple.syn]
278# include <compare>
279
280# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
281# pragma GCC system_header
282# endif
283
284_LIBCPP_PUSH_MACROS
285# include <__undef_macros>
286
287_LIBCPP_BEGIN_NAMESPACE_STD
288
289# ifndef _LIBCPP_CXX03_LANG
290
291// __tuple_leaf
292
293template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value >
294class __tuple_leaf;
295
296template <size_t _Ip, class _Hp, bool _Ep>
297inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
298swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<_Hp>) {
299 swap(__x.get(), __y.get());
300}
301
302template <size_t _Ip, class _Hp, bool _Ep>
303_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
304swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x,
305 const __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<const _Hp>) {
306 swap(__x.get(), __y.get());
307}
308
309template <size_t _Ip, class _Hp, bool>
310class __tuple_leaf {
311 _Hp __value_;
312
313public:
314 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete;
315
316 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) : __value_() {
317 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
318 }
319
320 template <class _Alloc>
321 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() {
322 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
323 }
324
325 template <class _Alloc>
326 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
327 : __value_(allocator_arg_t(), __a) {
328 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
329 }
330
331 template <class _Alloc>
332 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) {
333 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
334 }
335
336 template <
337 class _Tp,
338 __enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, int> = 0>
339 _LIBCPP_HIDE_FROM_ABI
340 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value)
341 : __value_(std::forward<_Tp>(__t)) {
342 static_assert(!__reference_constructs_from_temporary_v<_Hp, _Tp&&>,
343 "Attempted construction of reference element binds to a temporary whose lifetime has ended");
344 }
345
346 template <class _Tp, class _Alloc>
347 _LIBCPP_HIDE_FROM_ABI
348 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
349 : __value_(std::forward<_Tp>(__t)) {
350 static_assert(!__reference_constructs_from_temporary_v<_Hp, _Tp&&>,
351 "Attempted construction of reference element binds to a temporary whose lifetime has ended");
352 }
353
354 template <class _Tp, class _Alloc>
355 _LIBCPP_HIDE_FROM_ABI
356 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
357 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {
358 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple");
359 }
360
361 template <class _Tp, class _Alloc>
362 _LIBCPP_HIDE_FROM_ABI
363 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
364 : __value_(std::forward<_Tp>(__t), __a) {
365 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple");
366 }
367
368 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default;
369 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default;
370
371 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
372 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) {
373 std::swap(*this, __t);
374 return 0;
375 }
376
377 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const
378 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) {
379 std::swap(*this, __t);
380 return 0;
381 }
382
383 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; }
384 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; }
385};
386
387template <size_t _Ip, class _Hp>
388class __tuple_leaf<_Ip, _Hp, true> : private __remove_cv_t<_Hp> {
389public:
390 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete;
391
392 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) {}
393
394 template <class _Alloc>
395 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {}
396
397 template <class _Alloc>
398 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
399 : _Hp(allocator_arg_t(), __a) {}
400
401 template <class _Alloc>
402 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {}
403
404 template <class _Tp,
405 __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value,
406 int> = 0>
407 _LIBCPP_HIDE_FROM_ABI
408 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value)
409 : _Hp(std::forward<_Tp>(__t)) {}
410
411 template <class _Tp, class _Alloc>
412 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
413 : _Hp(std::forward<_Tp>(__t)) {}
414
415 template <class _Tp, class _Alloc>
416 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
417 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {}
418
419 template <class _Tp, class _Alloc>
420 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
421 : _Hp(std::forward<_Tp>(__t), __a) {}
422
423 __tuple_leaf(__tuple_leaf const&) = default;
424 __tuple_leaf(__tuple_leaf&&) = default;
425
426 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
427 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) {
428 std::swap(*this, __t);
429 return 0;
430 }
431
432 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const
433 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) {
434 std::swap(*this, __rhs);
435 return 0;
436 }
437
438 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); }
439 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT {
440 return static_cast<const _Hp&>(*this);
441 }
442};
443
444template <class... _Tp>
445_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {}
446
447template <class _Tp>
448struct __all_default_constructible;
449
450template <class... _Tp>
451struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {};
452
453// __tuple_impl
454
455template <class _Indx, class... _Tp>
456struct __tuple_impl;
457
458template <size_t... _Indx, class... _Tp>
459struct _LIBCPP_DECLSPEC_EMPTY_BASES
460 __tuple_impl<__tuple_indices<_Indx...>, _Tp...> : public __tuple_leaf<_Indx, _Tp>... {
461 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept(
462 __all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
463
464 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
465 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
466 __tuple_indices<_Uf...>,
467 __tuple_types<_Tf...>,
468 __tuple_indices<_Ul...>,
469 __tuple_types<_Tl...>,
470 _Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
471 __all<is_nothrow_default_constructible<_Tl>::value...>::value)
472 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {}
473
474 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
475 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
476 allocator_arg_t,
477 const _Alloc& __a,
478 __tuple_indices<_Uf...>,
479 __tuple_types<_Tf...>,
480 __tuple_indices<_Ul...>,
481 __tuple_types<_Tl...>,
482 _Up&&... __u)
483 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))...,
484 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {}
485
486 template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0>
487 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) noexcept(
488 (__all<is_nothrow_constructible<
489 _Tp,
490 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
491 : __tuple_leaf<_Indx, _Tp>(
492 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(
493 std::get<_Indx>(__t)))... {}
494
495 template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0>
496 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
497 : __tuple_leaf<_Indx, _Tp>(
498 __uses_alloc_ctor<_Tp,
499 _Alloc,
500 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(),
501 __a,
502 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(
503 std::get<_Indx>(__t)))... {}
504
505 __tuple_impl(const __tuple_impl&) = default;
506 __tuple_impl(__tuple_impl&&) = default;
507
508 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
509 swap(__tuple_impl& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
510 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...);
511 }
512
513 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const
514 noexcept(__all<__is_nothrow_swappable_v<const _Tp>...>::value) {
515 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...);
516 }
517};
518
519template <class _Dest, class _Source, size_t... _Np>
520_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
521__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) {
522 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...);
523}
524
525template <class _Dest, class _Source, class... _Up, size_t... _Np>
526_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
527__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) {
528 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...);
529}
530
531template <class... _Tp>
532class _LIBCPP_NO_SPECIALIZATIONS tuple {
533 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT;
534
535 _BaseT __base_;
536
537 template <size_t _Jp, class... _Up>
538 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
539 template <size_t _Jp, class... _Up>
540 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&
541 get(const tuple<_Up...>&) _NOEXCEPT;
542 template <size_t _Jp, class... _Up>
543 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&&
544 get(tuple<_Up...>&&) _NOEXCEPT;
545 template <size_t _Jp, class... _Up>
546 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&&
547 get(const tuple<_Up...>&&) _NOEXCEPT;
548
549public:
550 using __trivially_relocatable _LIBCPP_NODEBUG =
551 __conditional_t<_And<__libcpp_is_trivially_relocatable<_Tp>...>::value, tuple, void>;
552 using __replaceable _LIBCPP_NODEBUG = __conditional_t<_And<__is_replaceable<_Tp>...>::value, tuple, void>;
553
554 // [tuple.cnstr]
555
556 // tuple() constructors (including allocator_arg_t variants)
557 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible,
558 template <class...> class _IsDefault = is_default_constructible,
559 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0>
560 _LIBCPP_HIDE_FROM_ABI constexpr explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value)
561 tuple() noexcept(_And<is_nothrow_default_constructible<_Tp>...>::value) {}
562
563 template <class _Alloc,
564 template <class...> class _IsImpDefault = __is_implicitly_default_constructible,
565 template <class...> class _IsDefault = is_default_constructible,
566 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0>
567 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value)
568 tuple(allocator_arg_t, _Alloc const& __a)
569 : __base_(allocator_arg_t(),
570 __a,
571 __tuple_indices<>(),
572 __tuple_types<>(),
573 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
574 __tuple_types<_Tp...>()) {}
575
576 // tuple(const T&...) constructors (including allocator_arg_t variants)
577 template <template <class...> class _And = _And,
578 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0>
579 _LIBCPP_HIDE_FROM_ABI
580 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
581 tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value)
582 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
583 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
584 typename __make_tuple_indices<0>::type(),
585 typename __make_tuple_types<tuple, 0>::type(),
586 __t...) {}
587
588 template <class _Alloc,
589 template <class...> class _And = _And,
590 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0>
591 _LIBCPP_HIDE_FROM_ABI
592 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
593 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t)
594 : __base_(allocator_arg_t(),
595 __a,
596 typename __make_tuple_indices<sizeof...(_Tp)>::type(),
597 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
598 typename __make_tuple_indices<0>::type(),
599 typename __make_tuple_types<tuple, 0>::type(),
600 __t...) {}
601
602 // tuple(U&& ...) constructors (including allocator_arg_t variants)
603 template <class... _Up>
604 struct _IsThisTuple : false_type {};
605 template <class _Up>
606 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {};
607
608 template <class... _Up>
609 struct _EnableUTypesCtor
610 : _And< _BoolConstant<sizeof...(_Tp) >= 1>,
611 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors
612 is_constructible<_Tp, _Up>... > {};
613
614 template <class... _Up,
615 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value,
616 int> = 0>
617 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
618 tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
619 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
620 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
621 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
622 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
623 std::forward<_Up>(__u)...) {}
624
625 template <class _Alloc,
626 class... _Up,
627 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value,
628 int> = 0>
629 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
630 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
631 : __base_(allocator_arg_t(),
632 __a,
633 typename __make_tuple_indices<sizeof...(_Up)>::type(),
634 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
635 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
636 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
637 std::forward<_Up>(__u)...) {}
638
639 // Copy and move constructors (including the allocator_arg_t variants)
640 tuple(const tuple&) = default;
641 tuple(tuple&&) = default;
642
643 template <class _Alloc,
644 template <class...> class _And = _And,
645 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0>
646 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t)
647 : __base_(allocator_arg_t(), __alloc, __t) {}
648
649 template <class _Alloc,
650 template <class...> class _And = _And,
651 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0>
652 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t)
653 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
654
655 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants)
656
657 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void>
658 struct _EnableCtorFromUTypesTuple : false_type {};
659
660 template <class _OtherTuple, class... _Up>
661 struct _EnableCtorFromUTypesTuple<
662 _OtherTuple,
663 tuple<_Up...>,
664 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below
665 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>>
666 : _And<
667 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor
668 // can work. Otherwise, is_constructible can trigger hard error in those cases
669 // https://godbolt.org/z/M94cGdKcE
670 _Not<is_same<_OtherTuple, const tuple&> >,
671 _Not<is_same<_OtherTuple, tuple&&> >,
672 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >...,
673 _Lazy<_Or,
674 _BoolConstant<sizeof...(_Tp) != 1>,
675 // _Tp and _Up are 1-element packs - the pack expansions look
676 // weird to avoid tripping up the type traits in degenerate cases
677 _Lazy<_And,
678 _Not<is_same<_Tp, _Up> >...,
679 _Not<is_convertible<_OtherTuple, _Tp> >...,
680 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {};
681
682 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0>
683 _LIBCPP_HIDE_FROM_ABI
684 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value)
685 tuple(const tuple<_Up...>& __t) noexcept(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)
686 : __base_(__t) {}
687
688 template <class... _Up,
689 class _Alloc,
690 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0>
691 _LIBCPP_HIDE_FROM_ABI
692 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value)
693 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t)
694 : __base_(allocator_arg_t(), __a, __t) {}
695
696# if _LIBCPP_STD_VER >= 23
697 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants)
698
699 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr>
700 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t)
701 : __base_(__t) {}
702
703 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr>
704 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value)
705 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t)
706 : __base_(allocator_arg_t(), __alloc, __t) {}
707# endif // _LIBCPP_STD_VER >= 23
708
709 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants)
710 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0>
711 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
712 tuple(tuple<_Up...>&& __t) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
713 : __base_(std::move(__t)) {}
714
715 template <class _Alloc,
716 class... _Up,
717 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0>
718 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
719 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t)
720 : __base_(allocator_arg_t(), __a, std::move(__t)) {}
721
722# if _LIBCPP_STD_VER >= 23
723 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants)
724
725 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr>
726 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value)
727 tuple(const tuple<_Up...>&& __t)
728 : __base_(std::move(__t)) {}
729
730 template <class _Alloc,
731 class... _Up,
732 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr>
733 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value)
734 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t)
735 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
736# endif // _LIBCPP_STD_VER >= 23
737
738 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants)
739
740 template <template <class...> class _Pred,
741 class _Pair,
742 class _DecayedPair = __remove_cvref_t<_Pair>,
743 class _Tuple = tuple>
744 struct _CtorPredicateFromPair : false_type {};
745
746 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
747 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
748 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {};
749
750 template <class _Pair>
751 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {};
752
753 template <class _Pair>
754 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {};
755
756 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple>
757 struct _BothImplicitlyConvertible : false_type {};
758
759 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
760 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
761 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {};
762
763 template <class _Up1,
764 class _Up2,
765 template <class...> class _And = _And,
766 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0>
767 _LIBCPP_HIDE_FROM_ABI
768 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value)
769 tuple(const pair<_Up1, _Up2>& __p) noexcept(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)
770 : __base_(__p) {}
771
772 template <class _Alloc,
773 class _Up1,
774 class _Up2,
775 template <class...> class _And = _And,
776 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0>
777 _LIBCPP_HIDE_FROM_ABI
778 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value)
779 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p)
780 : __base_(allocator_arg_t(), __a, __p) {}
781
782# if _LIBCPP_STD_VER >= 23
783 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants)
784
785 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr>
786 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value)
787 tuple(pair<_U1, _U2>& __p)
788 : __base_(__p) {}
789
790 template <class _Alloc,
791 class _U1,
792 class _U2,
793 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr>
794 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value)
795 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p)
796 : __base_(allocator_arg_t(), __alloc, __p) {}
797# endif
798
799 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants)
800
801 template <class _Up1,
802 class _Up2,
803 template <class...> class _And = _And,
804 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0>
805 _LIBCPP_HIDE_FROM_ABI
806 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value)
807 tuple(pair<_Up1, _Up2>&& __p) noexcept(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)
808 : __base_(std::move(__p)) {}
809
810 template <class _Alloc,
811 class _Up1,
812 class _Up2,
813 template <class...> class _And = _And,
814 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0>
815 _LIBCPP_HIDE_FROM_ABI
816 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value)
817 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p)
818 : __base_(allocator_arg_t(), __a, std::move(__p)) {}
819
820# if _LIBCPP_STD_VER >= 23
821 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants)
822
823 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr>
824 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
825 tuple(const pair<_U1, _U2>&& __p)
826 : __base_(std::move(__p)) {}
827
828 template <class _Alloc,
829 class _U1,
830 class _U2,
831 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr>
832 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
833 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p)
834 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {}
835# endif // _LIBCPP_STD_VER >= 23
836
837 // [tuple.assign]
838 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
839 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) noexcept(
840 _And<is_nothrow_copy_assignable<_Tp>...>::value) {
841 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
842 return *this;
843 }
844
845# if _LIBCPP_STD_VER >= 23
846 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const
847 requires(_And<is_copy_assignable<const _Tp>...>::value)
848 {
849 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
850 return *this;
851 }
852
853 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const
854 requires(_And<is_assignable<const _Tp&, _Tp>...>::value)
855 {
856 std::__memberwise_forward_assign(
857 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
858 return *this;
859 }
860# endif // _LIBCPP_STD_VER >= 23
861
862 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
863 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) noexcept(
864 _And<is_nothrow_move_assignable<_Tp>...>::value) {
865 std::__memberwise_forward_assign(
866 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
867 return *this;
868 }
869
870 template <
871 class... _Up,
872 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value,
873 int> = 0>
874 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
875 operator=(tuple<_Up...> const& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
876 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
877 return *this;
878 }
879
880 template <class... _Up,
881 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value,
882 int> = 0>
883 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
884 operator=(tuple<_Up...>&& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
885 std::__memberwise_forward_assign(
886 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
887 return *this;
888 }
889
890# if _LIBCPP_STD_VER >= 23
891 template <class... _UTypes,
892 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
893 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr>
894 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const {
895 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type());
896 return *this;
897 }
898
899 template <class... _UTypes,
900 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
901 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr>
902 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const {
903 std::__memberwise_forward_assign(
904 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
905 return *this;
906 }
907# endif // _LIBCPP_STD_VER >= 23
908
909 template <template <class...> class _Pred,
910 bool _Const,
911 class _Pair,
912 class _DecayedPair = __remove_cvref_t<_Pair>,
913 class _Tuple = tuple>
914 struct _AssignPredicateFromPair : false_type {};
915
916 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
917 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
918 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >,
919 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {};
920
921 template <bool _Const, class _Pair>
922 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {};
923
924 template <bool _Const, class _Pair>
925 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {};
926
927# if _LIBCPP_STD_VER >= 23
928 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr>
929 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const
930 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) {
931 std::get<0>(*this) = __pair.first;
932 std::get<1>(*this) = __pair.second;
933 return *this;
934 }
935
936 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr>
937 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const
938 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) {
939 std::get<0>(*this) = std::move(__pair.first);
940 std::get<1>(*this) = std::move(__pair.second);
941 return *this;
942 }
943# endif // _LIBCPP_STD_VER >= 23
944
945 template <class _Up1,
946 class _Up2,
947 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0>
948 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
949 operator=(pair<_Up1, _Up2> const& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) {
950 std::get<0>(*this) = __pair.first;
951 std::get<1>(*this) = __pair.second;
952 return *this;
953 }
954
955 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0>
956 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
957 operator=(pair<_Up1, _Up2>&& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) {
958 std::get<0>(*this) = std::forward<_Up1>(__pair.first);
959 std::get<1>(*this) = std::forward<_Up2>(__pair.second);
960 return *this;
961 }
962
963 // EXTENSION
964 template <
965 class _Up,
966 size_t _Np,
967 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0>
968 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
969 operator=(array<_Up, _Np> const& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
970 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type());
971 return *this;
972 }
973
974 // EXTENSION
975 template <class _Up,
976 size_t _Np,
977 class = void,
978 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0>
979 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
980 operator=(array<_Up, _Np>&& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
981 std::__memberwise_forward_assign(
982 *this,
983 std::move(__array),
984 __tuple_types<_If<true, _Up, _Tp>...>(),
985 typename __make_tuple_indices<sizeof...(_Tp)>::type());
986 return *this;
987 }
988
989 // [tuple.swap]
990 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
991 swap(tuple& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
992 __base_.swap(__t.__base_);
993 }
994
995# if _LIBCPP_STD_VER >= 23
996 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const
997 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) {
998 __base_.swap(__t.__base_);
999 }
1000# endif // _LIBCPP_STD_VER >= 23
1001};
1002
1003_LIBCPP_DIAGNOSTIC_PUSH
1004# if __has_warning("-Winvalid-specialization")
1005_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization")
1006# endif
1007template <>
1008class tuple<> {
1009public:
1010 constexpr tuple() _NOEXCEPT = default;
1011 template <class _Alloc>
1012 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
1013 template <class _Alloc>
1014 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {}
1015 template <class _Up>
1016 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {}
1017 template <class _Alloc, class _Up>
1018 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
1019 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {}
1020# if _LIBCPP_STD_VER >= 23
1021 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {}
1022# endif
1023};
1024_LIBCPP_DIAGNOSTIC_POP
1025
1026# if _LIBCPP_STD_VER >= 23
1027template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual>
1028 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; }
1029struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> {
1030 using type _LIBCPP_NODEBUG = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>;
1031};
1032
1033template <class... _TTypes, class... _UTypes>
1034 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; }
1035struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> {
1036 using type _LIBCPP_NODEBUG = tuple<common_type_t<_TTypes, _UTypes>...>;
1037};
1038# endif // _LIBCPP_STD_VER >= 23
1039
1040# if _LIBCPP_STD_VER >= 17
1041template <class... _Tp>
1042tuple(_Tp...) -> tuple<_Tp...>;
1043template <class _Tp1, class _Tp2>
1044tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
1045template <class _Alloc, class... _Tp>
1046tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>;
1047template <class _Alloc, class _Tp1, class _Tp2>
1048tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
1049template <class _Alloc, class... _Tp>
1050tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>;
1051# endif
1052
1053template <class... _Tp, __enable_if_t<__all<__is_swappable_v<_Tp>...>::value, int> = 0>
1054inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
1055swap(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
1060template <class... _Tp>
1061_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void>
1062swap(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
1070template <size_t _Ip, class... _Tp>
1071inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&
1072get(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
1077template <size_t _Ip, class... _Tp>
1078inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
1079get(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
1084template <size_t _Ip, class... _Tp>
1085inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
1086get(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
1091template <size_t _Ip, class... _Tp>
1092inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
1093get(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
1100template <class _T1, class... _Args>
1101inline _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
1105template <class _T1, class... _Args>
1106inline _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
1110template <class _T1, class... _Args>
1111inline _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
1115template <class _T1, class... _Args>
1116inline _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
1124template <class... _Tp>
1125inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT {
1126 return tuple<_Tp&...>(__t...);
1127}
1128
1129template <class... _Tp>
1130inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<__unwrap_ref_decay_t<_Tp>...>
1131make_tuple(_Tp&&... __t) {
1132 return tuple<__unwrap_ref_decay_t<_Tp>...>(std::forward<_Tp>(__t)...);
1133}
1134
1135template <class... _Tp>
1136inline _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
1140template <size_t _Ip>
1141struct __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
1148template <>
1149struct __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
1156template <class... _Tp, class... _Up>
1157# if _LIBCPP_STD_VER >= 26
1158 requires(__all<requires(const _Tp& __t, const _Up& __u) {
1159 { __t == __u } -> __boolean_testable;
1160 }...>::value && (sizeof...(_Tp) == sizeof...(_Up)))
1161# endif
1162inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1163operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1164 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
1165 return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
1166}
1167
1168# if _LIBCPP_STD_VER >= 20
1169
1170// operator<=>
1171
1172template <class... _Tp, class... _Up, size_t... _Is>
1173_LIBCPP_HIDE_FROM_ABI constexpr auto
1174__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) {
1175 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal;
1176 static_cast<void>(
1177 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...));
1178 return __result;
1179}
1180
1181template <class... _Tp, class... _Up>
1182 requires(sizeof...(_Tp) == sizeof...(_Up))
1183_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...>
1184operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1185 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{});
1186}
1187
1188# else // _LIBCPP_STD_VER >= 20
1189
1190template <class... _Tp, class... _Up>
1191inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1192operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1193 return !(__x == __y);
1194}
1195
1196template <size_t _Ip>
1197struct __tuple_less {
1198 template <class _Tp, class _Up>
1199 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) {
1200 const size_t __idx = tuple_size<_Tp>::value - _Ip;
1201 if (std::get<__idx>(__x) < std::get<__idx>(__y))
1202 return true;
1203 if (std::get<__idx>(__y) < std::get<__idx>(__x))
1204 return false;
1205 return __tuple_less<_Ip - 1>()(__x, __y);
1206 }
1207};
1208
1209template <>
1210struct __tuple_less<0> {
1211 template <class _Tp, class _Up>
1212 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) {
1213 return false;
1214 }
1215};
1216
1217template <class... _Tp, class... _Up>
1218inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1219operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1220 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
1221 return __tuple_less<sizeof...(_Tp)>()(__x, __y);
1222}
1223
1224template <class... _Tp, class... _Up>
1225inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1226operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1227 return __y < __x;
1228}
1229
1230template <class... _Tp, class... _Up>
1231inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1232operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1233 return !(__x < __y);
1234}
1235
1236template <class... _Tp, class... _Up>
1237inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
1238operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
1239 return !(__y < __x);
1240}
1241
1242# endif // _LIBCPP_STD_VER >= 20
1243
1244// tuple_cat
1245
1246template <class _Tp, class _Up>
1247struct __tuple_cat_type;
1248
1249template <class... _Ttypes, class... _Utypes>
1250struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > {
1251 using type _LIBCPP_NODEBUG = tuple<_Ttypes..., _Utypes...>;
1252};
1253
1254template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples>
1255struct __tuple_cat_return_1 {};
1256
1257template <class... _Types, class _Tuple0>
1258struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> {
1259 using type _LIBCPP_NODEBUG =
1260 typename __tuple_cat_type< tuple<_Types...>,
1261 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type;
1262};
1263
1264template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples>
1265struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...>
1266 : public __tuple_cat_return_1<
1267 typename __tuple_cat_type< tuple<_Types...>,
1268 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type,
1269 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value,
1270 _Tuple1,
1271 _Tuples...> {};
1272
1273template <class... _Tuples>
1274struct __tuple_cat_return;
1275
1276template <class _Tuple0, class... _Tuples>
1277struct __tuple_cat_return<_Tuple0, _Tuples...>
1278 : public __tuple_cat_return_1<tuple<>,
1279 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value,
1280 _Tuple0,
1281 _Tuples...> {};
1282
1283template <>
1284struct __tuple_cat_return<> {
1285 using type _LIBCPP_NODEBUG = tuple<>;
1286};
1287
1288inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); }
1289
1290template <class _Rp, class _Indices, class _Tuple0, class... _Tuples>
1291struct __tuple_cat_return_ref_imp;
1292
1293template <class... _Types, size_t... _I0, class _Tuple0>
1294struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> {
1295 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
1296 typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type;
1297};
1298
1299template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples>
1300struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...>
1301 : public __tuple_cat_return_ref_imp<
1302 tuple<_Types...,
1303 __copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>,
1304 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type,
1305 _Tuple1,
1306 _Tuples...> {};
1307
1308template <class _Tuple0, class... _Tuples>
1309struct __tuple_cat_return_ref
1310 : public __tuple_cat_return_ref_imp<
1311 tuple<>,
1312 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type,
1313 _Tuple0,
1314 _Tuples...> {};
1315
1316template <class _Types, class _I0, class _J0>
1317struct __tuple_cat;
1318
1319template <class... _Types, size_t... _I0, size_t... _J0>
1320struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > {
1321 template <class _Tuple0>
1322 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
1323 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
1324 operator()(tuple<_Types...> __t, _Tuple0&& __t0) {
1325 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty
1326 return std::forward_as_tuple(
1327 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...);
1328 }
1329
1330 template <class _Tuple0, class _Tuple1, class... _Tuples>
1331 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
1332 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
1333 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) {
1334 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty
1335 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
1336 using _T1 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple1>;
1337 return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>,
1338 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type,
1339 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()(
1340 std::forward_as_tuple(
1341 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...),
1342 std::forward<_Tuple1>(__t1),
1343 std::forward<_Tuples>(__tpls)...);
1344 }
1345};
1346
1347template <class _TupleDst, class _TupleSrc, size_t... _Indices>
1348inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _TupleDst
1349__tuple_cat_select_element_wise(_TupleSrc&& __src, __tuple_indices<_Indices...>) {
1350 static_assert(tuple_size<_TupleDst>::value == tuple_size<_TupleSrc>::value,
1351 "misuse of __tuple_cat_select_element_wise with tuples of different sizes");
1352 return _TupleDst(std::get<_Indices>(std::forward<_TupleSrc>(__src))...);
1353}
1354
1355template <class _Tuple0, class... _Tuples>
1356inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type
1357tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) {
1358 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>;
1359 using _TRet _LIBCPP_NODEBUG = typename __tuple_cat_return<_Tuple0, _Tuples...>::type;
1360 using _T0Indices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_T0>::value>::type;
1361 using _TRetIndices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_TRet>::value>::type;
1362 return std::__tuple_cat_select_element_wise<_TRet>(
1363 __tuple_cat<tuple<>, __tuple_indices<>, _T0Indices>()(
1364 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...),
1365 _TRetIndices());
1366}
1367
1368template <class... _Tp, class _Alloc>
1369struct uses_allocator<tuple<_Tp...>, _Alloc> : true_type {};
1370
1371# if _LIBCPP_STD_VER >= 17
1372# define _LIBCPP_NOEXCEPT_RETURN(...) \
1373 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; }
1374
1375// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting.
1376// clang-format off
1377template <class _Fn, class _Tuple, size_t... _Id>
1378inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto)
1379__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>)
1380 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...))
1381
1382template <class _Fn, class _Tuple>
1383inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t)
1384 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl(
1385 std::forward<_Fn>(__f),
1386 std::forward<_Tuple>(__t),
1387 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
1388
1389#if _LIBCPP_STD_VER >= 20
1390template <class _Tp, class _Tuple, size_t... _Idx>
1391inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>)
1392 noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)))
1393 requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> {
1394 return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...);
1395}
1396#else
1397template <class _Tp, class _Tuple, size_t... _Idx>
1398inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>,
1399 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr)
1400 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))
1401#endif // _LIBCPP_STD_VER >= 20
1402
1403template <class _Tp, class _Tuple,
1404 class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void>
1405inline constexpr bool __can_make_from_tuple = false;
1406
1407template <class _Tp, class _Tuple, size_t... _Idx>
1408inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>,
1409 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true;
1410
1411// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9,
1412// the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple
1413// SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl
1414// so that std::__make_from_tuple_impl will have the same advantages when used alone.
1415#if _LIBCPP_STD_VER >= 20
1416template <class _Tp, class _Tuple>
1417 requires __can_make_from_tuple<_Tp, _Tuple> // strengthen
1418#else
1419template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen
1420#endif // _LIBCPP_STD_VER >= 20
1421inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t)
1422 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>(
1423 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
1424# undef _LIBCPP_NOEXCEPT_RETURN
1425
1426# endif // _LIBCPP_STD_VER >= 17
1427
1428#endif // !defined(_LIBCPP_CXX03_LANG)
1429
1430_LIBCPP_END_NAMESPACE_STD
1431
1432_LIBCPP_POP_MACROS
1433
1434// clang-format on
1435
1436# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
1437# include <cstddef>
1438# include <exception>
1439# include <iosfwd>
1440# include <new>
1441# include <type_traits>
1442# include <typeinfo>
1443# include <utility>
1444# endif
1445#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
1446
1447#endif // _LIBCPP_TUPLE