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#include <__compare/common_comparison_category.h> 214#include <__compare/synth_three_way.h> 215#include <__config> 216#include <__functional/invoke.h> 217#include <__fwd/array.h> 218#include <__fwd/pair.h> 219#include <__fwd/tuple.h> 220#include <__memory/allocator_arg_t.h> 221#include <__memory/uses_allocator.h> 222#include <__tuple/find_index.h> 223#include <__tuple/ignore.h> 224#include <__tuple/make_tuple_types.h> 225#include <__tuple/sfinae_helpers.h> 226#include <__tuple/tuple_element.h> 227#include <__tuple/tuple_indices.h> 228#include <__tuple/tuple_like_ext.h> 229#include <__tuple/tuple_size.h> 230#include <__tuple/tuple_types.h> 231#include <__type_traits/common_reference.h> 232#include <__type_traits/common_type.h> 233#include <__type_traits/conditional.h> 234#include <__type_traits/conjunction.h> 235#include <__type_traits/copy_cvref.h> 236#include <__type_traits/disjunction.h> 237#include <__type_traits/is_arithmetic.h> 238#include <__type_traits/is_assignable.h> 239#include <__type_traits/is_constructible.h> 240#include <__type_traits/is_convertible.h> 241#include <__type_traits/is_empty.h> 242#include <__type_traits/is_final.h> 243#include <__type_traits/is_implicitly_default_constructible.h> 244#include <__type_traits/is_nothrow_assignable.h> 245#include <__type_traits/is_nothrow_constructible.h> 246#include <__type_traits/is_reference.h> 247#include <__type_traits/is_same.h> 248#include <__type_traits/is_swappable.h> 249#include <__type_traits/is_trivially_relocatable.h> 250#include <__type_traits/lazy.h> 251#include <__type_traits/maybe_const.h> 252#include <__type_traits/nat.h> 253#include <__type_traits/negation.h> 254#include <__type_traits/remove_cvref.h> 255#include <__type_traits/remove_reference.h> 256#include <__type_traits/unwrap_ref.h> 257#include <__utility/forward.h> 258#include <__utility/integer_sequence.h> 259#include <__utility/move.h> 260#include <__utility/piecewise_construct.h> 261#include <__utility/swap.h> 262#include <cstddef> 263#include <version> 264 265// standard-mandated includes 266 267// [tuple.syn] 268#include <compare> 269 270#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 271# pragma GCC system_header 272#endif 273 274_LIBCPP_PUSH_MACROS 275#include <__undef_macros> 276 277_LIBCPP_BEGIN_NAMESPACE_STD 278 279#ifndef _LIBCPP_CXX03_LANG 280 281// __tuple_leaf 282 283template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value > 284class __tuple_leaf; 285 286template <size_t _Ip, class _Hp, bool _Ep> 287inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 288swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<_Hp>) { 289 swap(__x.get(), __y.get()); 290} 291 292template <size_t _Ip, class _Hp, bool _Ep> 293_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 294swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, 295 const __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<const _Hp>) { 296 swap(__x.get(), __y.get()); 297} 298 299template <size_t _Ip, class _Hp, bool> 300class __tuple_leaf { 301 _Hp __value_; 302 303 template <class _Tp> 304 static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() { 305# if __has_keyword(__reference_binds_to_temporary) 306 return !__reference_binds_to_temporary(_Hp, _Tp); 307# else 308 return true; 309# endif 310 } 311 312public: 313 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 314 315 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) : __value_() { 316 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 317 } 318 319 template <class _Alloc> 320 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() { 321 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 322 } 323 324 template <class _Alloc> 325 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 326 : __value_(allocator_arg_t(), __a) { 327 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 328 } 329 330 template <class _Alloc> 331 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) { 332 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 333 } 334 335 template < 336 class _Tp, 337 __enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, int> = 0> 338 _LIBCPP_HIDE_FROM_ABI 339 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value) 340 : __value_(std::forward<_Tp>(__t)) { 341 static_assert(__can_bind_reference<_Tp&&>(), 342 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 343 } 344 345 template <class _Tp, class _Alloc> 346 _LIBCPP_HIDE_FROM_ABI 347 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 348 : __value_(std::forward<_Tp>(__t)) { 349 static_assert(__can_bind_reference<_Tp&&>(), 350 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 351 } 352 353 template <class _Tp, class _Alloc> 354 _LIBCPP_HIDE_FROM_ABI 355 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 356 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) { 357 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 358 } 359 360 template <class _Tp, class _Alloc> 361 _LIBCPP_HIDE_FROM_ABI 362 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 363 : __value_(std::forward<_Tp>(__t), __a) { 364 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 365 } 366 367 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default; 368 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default; 369 370 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int 371 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) { 372 std::swap(*this, __t); 373 return 0; 374 } 375 376 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const 377 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) { 378 std::swap(*this, __t); 379 return 0; 380 } 381 382 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; } 383 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; } 384}; 385 386template <size_t _Ip, class _Hp> 387class __tuple_leaf<_Ip, _Hp, true> : private _Hp { 388public: 389 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 390 391 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) {} 392 393 template <class _Alloc> 394 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 395 396 template <class _Alloc> 397 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 398 : _Hp(allocator_arg_t(), __a) {} 399 400 template <class _Alloc> 401 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {} 402 403 template <class _Tp, 404 __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, 405 int> = 0> 406 _LIBCPP_HIDE_FROM_ABI 407 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value) 408 : _Hp(std::forward<_Tp>(__t)) {} 409 410 template <class _Tp, class _Alloc> 411 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 412 : _Hp(std::forward<_Tp>(__t)) {} 413 414 template <class _Tp, class _Alloc> 415 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 416 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {} 417 418 template <class _Tp, class _Alloc> 419 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 420 : _Hp(std::forward<_Tp>(__t), __a) {} 421 422 __tuple_leaf(__tuple_leaf const&) = default; 423 __tuple_leaf(__tuple_leaf&&) = default; 424 425 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int 426 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) { 427 std::swap(*this, __t); 428 return 0; 429 } 430 431 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const 432 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) { 433 std::swap(*this, __rhs); 434 return 0; 435 } 436 437 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); } 438 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { 439 return static_cast<const _Hp&>(*this); 440 } 441}; 442 443template <class... _Tp> 444_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {} 445 446template <class _Tp> 447struct __all_default_constructible; 448 449template <class... _Tp> 450struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {}; 451 452// __tuple_impl 453 454template <class _Indx, class... _Tp> 455struct __tuple_impl; 456 457template <size_t... _Indx, class... _Tp> 458struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 459 : public __tuple_leaf<_Indx, _Tp>... { 460 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept( 461 __all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 462 463 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 464 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 465 __tuple_indices<_Uf...>, 466 __tuple_types<_Tf...>, 467 __tuple_indices<_Ul...>, 468 __tuple_types<_Tl...>, 469 _Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 470 __all<is_nothrow_default_constructible<_Tl>::value...>::value) 471 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {} 472 473 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 474 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 475 allocator_arg_t, 476 const _Alloc& __a, 477 __tuple_indices<_Uf...>, 478 __tuple_types<_Tf...>, 479 __tuple_indices<_Ul...>, 480 __tuple_types<_Tl...>, 481 _Up&&... __u) 482 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))..., 483 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {} 484 485 template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 486 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) noexcept( 487 (__all<is_nothrow_constructible< 488 _Tp, 489 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 490 : __tuple_leaf<_Indx, _Tp>( 491 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 492 std::get<_Indx>(__t)))... {} 493 494 template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 495 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 496 : __tuple_leaf<_Indx, _Tp>( 497 __uses_alloc_ctor<_Tp, 498 _Alloc, 499 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(), 500 __a, 501 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 502 std::get<_Indx>(__t)))... {} 503 504 __tuple_impl(const __tuple_impl&) = default; 505 __tuple_impl(__tuple_impl&&) = default; 506 507 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 508 swap(__tuple_impl& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 509 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 510 } 511 512 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const 513 noexcept(__all<__is_nothrow_swappable_v<const _Tp>...>::value) { 514 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 515 } 516}; 517 518template <class _Dest, class _Source, size_t... _Np> 519_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 520__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 521 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...); 522} 523 524template <class _Dest, class _Source, class... _Up, size_t... _Np> 525_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 526__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 527 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...); 528} 529 530template <class... _Tp> 531class _LIBCPP_TEMPLATE_VIS tuple { 532 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 533 534 _BaseT __base_; 535 536 template <size_t _Jp, class... _Up> 537 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 538 template <size_t _Jp, class... _Up> 539 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type& 540 get(const tuple<_Up...>&) _NOEXCEPT; 541 template <size_t _Jp, class... _Up> 542 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&& 543 get(tuple<_Up...>&&) _NOEXCEPT; 544 template <size_t _Jp, class... _Up> 545 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&& 546 get(const tuple<_Up...>&&) _NOEXCEPT; 547 548public: 549 using __trivially_relocatable = __conditional_t<_And<__libcpp_is_trivially_relocatable<_Tp>...>::value, tuple, void>; 550 551 // [tuple.cnstr] 552 553 // tuple() constructors (including allocator_arg_t variants) 554 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 555 template <class...> class _IsDefault = is_default_constructible, 556 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 557 _LIBCPP_HIDE_FROM_ABI constexpr explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 558 tuple() noexcept(_And<is_nothrow_default_constructible<_Tp>...>::value) {} 559 560 template <class _Alloc, 561 template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 562 template <class...> class _IsDefault = is_default_constructible, 563 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 564 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 565 tuple(allocator_arg_t, _Alloc const& __a) 566 : __base_(allocator_arg_t(), 567 __a, 568 __tuple_indices<>(), 569 __tuple_types<>(), 570 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 571 __tuple_types<_Tp...>()) {} 572 573 // tuple(const T&...) constructors (including allocator_arg_t variants) 574 template <template <class...> class _And = _And, 575 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 576 _LIBCPP_HIDE_FROM_ABI 577 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 578 tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value) 579 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 580 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 581 typename __make_tuple_indices<0>::type(), 582 typename __make_tuple_types<tuple, 0>::type(), 583 __t...) {} 584 585 template <class _Alloc, 586 template <class...> class _And = _And, 587 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 588 _LIBCPP_HIDE_FROM_ABI 589 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 590 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t) 591 : __base_(allocator_arg_t(), 592 __a, 593 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 594 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 595 typename __make_tuple_indices<0>::type(), 596 typename __make_tuple_types<tuple, 0>::type(), 597 __t...) {} 598 599 // tuple(U&& ...) constructors (including allocator_arg_t variants) 600 template <class... _Up> 601 struct _IsThisTuple : false_type {}; 602 template <class _Up> 603 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {}; 604 605 template <class... _Up> 606 struct _EnableUTypesCtor 607 : _And< _BoolConstant<sizeof...(_Tp) >= 1>, 608 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 609 is_constructible<_Tp, _Up>... > {}; 610 611 template <class... _Up, 612 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 613 int> = 0> 614 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 615 tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 616 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 617 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 618 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 619 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 620 std::forward<_Up>(__u)...) {} 621 622 template <class _Alloc, 623 class... _Up, 624 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 625 int> = 0> 626 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 627 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 628 : __base_(allocator_arg_t(), 629 __a, 630 typename __make_tuple_indices<sizeof...(_Up)>::type(), 631 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 632 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 633 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 634 std::forward<_Up>(__u)...) {} 635 636 // Copy and move constructors (including the allocator_arg_t variants) 637 tuple(const tuple&) = default; 638 tuple(tuple&&) = default; 639 640 template <class _Alloc, 641 template <class...> class _And = _And, 642 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0> 643 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 644 : __base_(allocator_arg_t(), __alloc, __t) {} 645 646 template <class _Alloc, 647 template <class...> class _And = _And, 648 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0> 649 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 650 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 651 652 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 653 654 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void> 655 struct _EnableCtorFromUTypesTuple : false_type {}; 656 657 template <class _OtherTuple, class... _Up> 658 struct _EnableCtorFromUTypesTuple< 659 _OtherTuple, 660 tuple<_Up...>, 661 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 662 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> 663 : _And< 664 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor 665 // can work. Otherwise, is_constructible can trigger hard error in those cases 666 // https://godbolt.org/z/M94cGdKcE 667 _Not<is_same<_OtherTuple, const tuple&> >, 668 _Not<is_same<_OtherTuple, tuple&&> >, 669 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 670 _Lazy<_Or, 671 _BoolConstant<sizeof...(_Tp) != 1>, 672 // _Tp and _Up are 1-element packs - the pack expansions look 673 // weird to avoid tripping up the type traits in degenerate cases 674 _Lazy<_And, 675 _Not<is_same<_Tp, _Up> >..., 676 _Not<is_convertible<_OtherTuple, _Tp> >..., 677 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {}; 678 679 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 680 _LIBCPP_HIDE_FROM_ABI 681 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 682 tuple(const tuple<_Up...>& __t) noexcept(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value) 683 : __base_(__t) {} 684 685 template <class... _Up, 686 class _Alloc, 687 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 688 _LIBCPP_HIDE_FROM_ABI 689 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 690 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 691 : __base_(allocator_arg_t(), __a, __t) {} 692 693# if _LIBCPP_STD_VER >= 23 694 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 695 696 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 697 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t) 698 : __base_(__t) {} 699 700 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 701 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) 702 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) 703 : __base_(allocator_arg_t(), __alloc, __t) {} 704# endif // _LIBCPP_STD_VER >= 23 705 706 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 707 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 708 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 709 tuple(tuple<_Up...>&& __t) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 710 : __base_(std::move(__t)) {} 711 712 template <class _Alloc, 713 class... _Up, 714 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 715 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 716 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 717 : __base_(allocator_arg_t(), __a, std::move(__t)) {} 718 719# if _LIBCPP_STD_VER >= 23 720 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 721 722 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 723 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 724 tuple(const tuple<_Up...>&& __t) 725 : __base_(std::move(__t)) {} 726 727 template <class _Alloc, 728 class... _Up, 729 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 730 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 731 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 732 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 733# endif // _LIBCPP_STD_VER >= 23 734 735 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 736 737 template <template <class...> class _Pred, 738 class _Pair, 739 class _DecayedPair = __remove_cvref_t<_Pair>, 740 class _Tuple = tuple> 741 struct _CtorPredicateFromPair : false_type {}; 742 743 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 744 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 745 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {}; 746 747 template <class _Pair> 748 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {}; 749 750 template <class _Pair> 751 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {}; 752 753 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 754 struct _BothImplicitlyConvertible : false_type {}; 755 756 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 757 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 758 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {}; 759 760 template <class _Up1, 761 class _Up2, 762 template <class...> class _And = _And, 763 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 764 _LIBCPP_HIDE_FROM_ABI 765 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 766 tuple(const pair<_Up1, _Up2>& __p) noexcept(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value) 767 : __base_(__p) {} 768 769 template <class _Alloc, 770 class _Up1, 771 class _Up2, 772 template <class...> class _And = _And, 773 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 774 _LIBCPP_HIDE_FROM_ABI 775 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 776 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 777 : __base_(allocator_arg_t(), __a, __p) {} 778 779# if _LIBCPP_STD_VER >= 23 780 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 781 782 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 783 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 784 tuple(pair<_U1, _U2>& __p) 785 : __base_(__p) {} 786 787 template <class _Alloc, 788 class _U1, 789 class _U2, 790 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 791 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 792 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) 793 : __base_(allocator_arg_t(), __alloc, __p) {} 794# endif 795 796 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 797 798 template <class _Up1, 799 class _Up2, 800 template <class...> class _And = _And, 801 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 802 _LIBCPP_HIDE_FROM_ABI 803 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 804 tuple(pair<_Up1, _Up2>&& __p) noexcept(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value) 805 : __base_(std::move(__p)) {} 806 807 template <class _Alloc, 808 class _Up1, 809 class _Up2, 810 template <class...> class _And = _And, 811 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 812 _LIBCPP_HIDE_FROM_ABI 813 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 814 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 815 : __base_(allocator_arg_t(), __a, std::move(__p)) {} 816 817# if _LIBCPP_STD_VER >= 23 818 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 819 820 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 821 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 822 tuple(const pair<_U1, _U2>&& __p) 823 : __base_(std::move(__p)) {} 824 825 template <class _Alloc, 826 class _U1, 827 class _U2, 828 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 829 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 830 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 831 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 832# endif // _LIBCPP_STD_VER >= 23 833 834 // [tuple.assign] 835 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 836 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 837 noexcept(_And<is_nothrow_copy_assignable<_Tp>...>::value) { 838 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 839 return *this; 840 } 841 842# if _LIBCPP_STD_VER >= 23 843 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const 844 requires(_And<is_copy_assignable<const _Tp>...>::value) 845 { 846 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 847 return *this; 848 } 849 850 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const 851 requires(_And<is_assignable<const _Tp&, _Tp>...>::value) 852 { 853 std::__memberwise_forward_assign( 854 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 855 return *this; 856 } 857# endif // _LIBCPP_STD_VER >= 23 858 859 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 860 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 861 noexcept(_And<is_nothrow_move_assignable<_Tp>...>::value) { 862 std::__memberwise_forward_assign( 863 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 864 return *this; 865 } 866 867 template < 868 class... _Up, 869 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value, 870 int> = 0> 871 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...> const& __tuple) 872 noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 873 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 874 return *this; 875 } 876 877 template <class... _Up, 878 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value, 879 int> = 0> 880 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...>&& __tuple) 881 noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 882 std::__memberwise_forward_assign( 883 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 884 return *this; 885 } 886 887# if _LIBCPP_STD_VER >= 23 888 template <class... _UTypes, 889 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 890 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 891 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const { 892 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 893 return *this; 894 } 895 896 template <class... _UTypes, 897 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 898 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 899 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const { 900 std::__memberwise_forward_assign( 901 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 902 return *this; 903 } 904# endif // _LIBCPP_STD_VER >= 23 905 906 template <template <class...> class _Pred, 907 bool _Const, 908 class _Pair, 909 class _DecayedPair = __remove_cvref_t<_Pair>, 910 class _Tuple = tuple> 911 struct _AssignPredicateFromPair : false_type {}; 912 913 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 914 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 915 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 916 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {}; 917 918 template <bool _Const, class _Pair> 919 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 920 921 template <bool _Const, class _Pair> 922 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 923 924# if _LIBCPP_STD_VER >= 23 925 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 926 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const 927 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 928 std::get<0>(*this) = __pair.first; 929 std::get<1>(*this) = __pair.second; 930 return *this; 931 } 932 933 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 934 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const 935 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 936 std::get<0>(*this) = std::move(__pair.first); 937 std::get<1>(*this) = std::move(__pair.second); 938 return *this; 939 } 940# endif // _LIBCPP_STD_VER >= 23 941 942 template <class _Up1, 943 class _Up2, 944 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0> 945 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2> const& __pair) 946 noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) { 947 std::get<0>(*this) = __pair.first; 948 std::get<1>(*this) = __pair.second; 949 return *this; 950 } 951 952 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0> 953 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2>&& __pair) 954 noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) { 955 std::get<0>(*this) = std::forward<_Up1>(__pair.first); 956 std::get<1>(*this) = std::forward<_Up2>(__pair.second); 957 return *this; 958 } 959 960 // EXTENSION 961 template < 962 class _Up, 963 size_t _Np, 964 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0> 965 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np> const& __array) 966 noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 967 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 968 return *this; 969 } 970 971 // EXTENSION 972 template <class _Up, 973 size_t _Np, 974 class = void, 975 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0> 976 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np>&& __array) 977 noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 978 std::__memberwise_forward_assign( 979 *this, 980 std::move(__array), 981 __tuple_types<_If<true, _Up, _Tp>...>(), 982 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 983 return *this; 984 } 985 986 // [tuple.swap] 987 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple& __t) 988 noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 989 __base_.swap(__t.__base_); 990 } 991 992# if _LIBCPP_STD_VER >= 23 993 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const 994 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 995 __base_.swap(__t.__base_); 996 } 997# endif // _LIBCPP_STD_VER >= 23 998}; 999 1000template <> 1001class _LIBCPP_TEMPLATE_VIS tuple<> { 1002public: 1003 constexpr tuple() _NOEXCEPT = default; 1004 template <class _Alloc> 1005 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1006 template <class _Alloc> 1007 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1008 template <class _Up> 1009 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {} 1010 template <class _Alloc, class _Up> 1011 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1012 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {} 1013# if _LIBCPP_STD_VER >= 23 1014 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1015# endif 1016}; 1017 1018# if _LIBCPP_STD_VER >= 23 1019template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual> 1020 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1021struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1022 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1023}; 1024 1025template <class... _TTypes, class... _UTypes> 1026 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1027struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1028 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1029}; 1030# endif // _LIBCPP_STD_VER >= 23 1031 1032# if _LIBCPP_STD_VER >= 17 1033template <class... _Tp> 1034tuple(_Tp...) -> tuple<_Tp...>; 1035template <class _Tp1, class _Tp2> 1036tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1037template <class _Alloc, class... _Tp> 1038tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1039template <class _Alloc, class _Tp1, class _Tp2> 1040tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1041template <class _Alloc, class... _Tp> 1042tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1043# endif 1044 1045template <class... _Tp, __enable_if_t<__all<__is_swappable_v<_Tp>...>::value, int> = 0> 1046inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1047 noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 1048 __t.swap(__u); 1049} 1050 1051# if _LIBCPP_STD_VER >= 23 1052template <class... _Tp> 1053_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1054swap(const tuple<_Tp...>& __lhs, 1055 const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1056 __lhs.swap(__rhs); 1057} 1058# endif 1059 1060// get 1061 1062template <size_t _Ip, class... _Tp> 1063inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type& 1064get(tuple<_Tp...>& __t) _NOEXCEPT { 1065 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1066 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1067} 1068 1069template <size_t _Ip, class... _Tp> 1070inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1071get(const tuple<_Tp...>& __t) _NOEXCEPT { 1072 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1073 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1074} 1075 1076template <size_t _Ip, class... _Tp> 1077inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1078get(tuple<_Tp...>&& __t) _NOEXCEPT { 1079 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1080 return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1081} 1082 1083template <size_t _Ip, class... _Tp> 1084inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1085get(const tuple<_Tp...>&& __t) _NOEXCEPT { 1086 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1087 return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1088} 1089 1090# if _LIBCPP_STD_VER >= 14 1091 1092template <class _T1, class... _Args> 1093inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept { 1094 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1095} 1096 1097template <class _T1, class... _Args> 1098inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept { 1099 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1100} 1101 1102template <class _T1, class... _Args> 1103inline _LIBCPP_HIDE_FROM_ABI constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept { 1104 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1105} 1106 1107template <class _T1, class... _Args> 1108inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept { 1109 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1110} 1111 1112# endif 1113 1114// tie 1115 1116template <class... _Tp> 1117inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT { 1118 return tuple<_Tp&...>(__t...); 1119} 1120 1121template <class... _Tp> 1122inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<typename __unwrap_ref_decay<_Tp>::type...> 1123make_tuple(_Tp&&... __t) { 1124 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(std::forward<_Tp>(__t)...); 1125} 1126 1127template <class... _Tp> 1128inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT { 1129 return tuple<_Tp&&...>(std::forward<_Tp>(__t)...); 1130} 1131 1132template <size_t _Ip> 1133struct __tuple_equal { 1134 template <class _Tp, class _Up> 1135 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1136 return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y); 1137 } 1138}; 1139 1140template <> 1141struct __tuple_equal<0> { 1142 template <class _Tp, class _Up> 1143 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1144 return true; 1145 } 1146}; 1147 1148template <class... _Tp, class... _Up> 1149inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1150operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1151 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1152 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1153} 1154 1155# if _LIBCPP_STD_VER >= 20 1156 1157// operator<=> 1158 1159template <class... _Tp, class... _Up, size_t... _Is> 1160_LIBCPP_HIDE_FROM_ABI constexpr auto 1161__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1162 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1163 static_cast<void>( 1164 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...)); 1165 return __result; 1166} 1167 1168template <class... _Tp, class... _Up> 1169 requires(sizeof...(_Tp) == sizeof...(_Up)) 1170_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1171operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1172 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1173} 1174 1175# else // _LIBCPP_STD_VER >= 20 1176 1177template <class... _Tp, class... _Up> 1178inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1179operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1180 return !(__x == __y); 1181} 1182 1183template <size_t _Ip> 1184struct __tuple_less { 1185 template <class _Tp, class _Up> 1186 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1187 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1188 if (std::get<__idx>(__x) < std::get<__idx>(__y)) 1189 return true; 1190 if (std::get<__idx>(__y) < std::get<__idx>(__x)) 1191 return false; 1192 return __tuple_less<_Ip - 1>()(__x, __y); 1193 } 1194}; 1195 1196template <> 1197struct __tuple_less<0> { 1198 template <class _Tp, class _Up> 1199 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1200 return false; 1201 } 1202}; 1203 1204template <class... _Tp, class... _Up> 1205inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1206operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1207 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1208 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1209} 1210 1211template <class... _Tp, class... _Up> 1212inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1213operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1214 return __y < __x; 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 return !(__x < __y); 1221} 1222 1223template <class... _Tp, class... _Up> 1224inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1225operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1226 return !(__y < __x); 1227} 1228 1229# endif // _LIBCPP_STD_VER >= 20 1230 1231// tuple_cat 1232 1233template <class _Tp, class _Up> 1234struct __tuple_cat_type; 1235 1236template <class... _Ttypes, class... _Utypes> 1237struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > { 1238 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1239}; 1240 1241template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples> 1242struct __tuple_cat_return_1 {}; 1243 1244template <class... _Types, class _Tuple0> 1245struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> { 1246 using type _LIBCPP_NODEBUG = 1247 typename __tuple_cat_type< tuple<_Types...>, 1248 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type; 1249}; 1250 1251template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples> 1252struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1253 : public __tuple_cat_return_1< 1254 typename __tuple_cat_type< tuple<_Types...>, 1255 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type, 1256 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value, 1257 _Tuple1, 1258 _Tuples...> {}; 1259 1260template <class... _Tuples> 1261struct __tuple_cat_return; 1262 1263template <class _Tuple0, class... _Tuples> 1264struct __tuple_cat_return<_Tuple0, _Tuples...> 1265 : public __tuple_cat_return_1<tuple<>, 1266 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value, 1267 _Tuple0, 1268 _Tuples...> {}; 1269 1270template <> 1271struct __tuple_cat_return<> { 1272 typedef _LIBCPP_NODEBUG tuple<> type; 1273}; 1274 1275inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); } 1276 1277template <class _Rp, class _Indices, class _Tuple0, class... _Tuples> 1278struct __tuple_cat_return_ref_imp; 1279 1280template <class... _Types, size_t... _I0, class _Tuple0> 1281struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> { 1282 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1283 typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type; 1284}; 1285 1286template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples> 1287struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...> 1288 : public __tuple_cat_return_ref_imp< 1289 tuple<_Types..., 1290 __copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>, 1291 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type, 1292 _Tuple1, 1293 _Tuples...> {}; 1294 1295template <class _Tuple0, class... _Tuples> 1296struct __tuple_cat_return_ref 1297 : public __tuple_cat_return_ref_imp< 1298 tuple<>, 1299 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type, 1300 _Tuple0, 1301 _Tuples...> {}; 1302 1303template <class _Types, class _I0, class _J0> 1304struct __tuple_cat; 1305 1306template <class... _Types, size_t... _I0, size_t... _J0> 1307struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > { 1308 template <class _Tuple0> 1309 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1310 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1311 operator()(tuple<_Types...> __t, _Tuple0&& __t0) { 1312 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1313 return std::forward_as_tuple( 1314 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...); 1315 } 1316 1317 template <class _Tuple0, class _Tuple1, class... _Tuples> 1318 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1319 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1320 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) { 1321 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1322 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1323 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple1> _T1; 1324 return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>, 1325 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type, 1326 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1327 std::forward_as_tuple( 1328 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...), 1329 std::forward<_Tuple1>(__t1), 1330 std::forward<_Tuples>(__tpls)...); 1331 } 1332}; 1333 1334template <class _Tuple0, class... _Tuples> 1335inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1336tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) { 1337 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1338 return __tuple_cat<tuple<>, __tuple_indices<>, typename __make_tuple_indices<tuple_size<_T0>::value>::type>()( 1339 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...); 1340} 1341 1342template <class... _Tp, class _Alloc> 1343struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {}; 1344 1345# if _LIBCPP_STD_VER >= 17 1346# define _LIBCPP_NOEXCEPT_RETURN(...) \ 1347 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1348 1349// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting. 1350// clang-format off 1351template <class _Fn, class _Tuple, size_t... _Id> 1352inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) 1353__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>) 1354 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...)) 1355 1356template <class _Fn, class _Tuple> 1357inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t) 1358 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl( 1359 std::forward<_Fn>(__f), 1360 std::forward<_Tuple>(__t), 1361 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1362 1363#if _LIBCPP_STD_VER >= 20 1364template <class _Tp, class _Tuple, size_t... _Idx> 1365inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1366 noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))) 1367 requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> { 1368 return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); 1369} 1370#else 1371template <class _Tp, class _Tuple, size_t... _Idx> 1372inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>, 1373 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr) 1374 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)) 1375#endif // _LIBCPP_STD_VER >= 20 1376 1377template <class _Tp, class _Tuple, 1378 class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void> 1379inline constexpr bool __can_make_from_tuple = false; 1380 1381template <class _Tp, class _Tuple, size_t... _Idx> 1382inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>, 1383 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true; 1384 1385// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9, 1386// the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple 1387// SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl 1388// so that std::__make_from_tuple_impl will have the same advantages when used alone. 1389#if _LIBCPP_STD_VER >= 20 1390template <class _Tp, class _Tuple> 1391 requires __can_make_from_tuple<_Tp, _Tuple> // strengthen 1392#else 1393template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen 1394#endif // _LIBCPP_STD_VER >= 20 1395inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t) 1396 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>( 1397 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1398# undef _LIBCPP_NOEXCEPT_RETURN 1399 1400# endif // _LIBCPP_STD_VER >= 17 1401 1402#endif // !defined(_LIBCPP_CXX03_LANG) 1403 1404_LIBCPP_END_NAMESPACE_STD 1405 1406_LIBCPP_POP_MACROS 1407 1408// clang-format on 1409 1410#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1411# include <exception> 1412# include <iosfwd> 1413# include <new> 1414# include <type_traits> 1415# include <typeinfo> 1416# include <utility> 1417#endif 1418 1419#endif // _LIBCPP_TUPLE 1420