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/* 14 tuple synopsis 15 16namespace std 17{ 18 19template <class... T> 20class tuple { 21public: 22 explicit(see-below) constexpr tuple(); 23 explicit(see-below) tuple(const T&...); // constexpr in C++14 24 template <class... U> 25 explicit(see-below) tuple(U&&...); // constexpr in C++14 26 tuple(const tuple&) = default; 27 tuple(tuple&&) = default; 28 29 template<class... UTypes> 30 constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23 31 template <class... U> 32 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14 33 template <class... U> 34 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14 35 template<class... UTypes> 36 constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23 37 38 template<class U1, class U2> 39 constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23 40 template <class U1, class U2> 41 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14 42 template <class U1, class U2> 43 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14 44 template<class U1, class U2> 45 constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23 46 47 // allocator-extended constructors 48 template <class Alloc> 49 tuple(allocator_arg_t, const Alloc& a); 50 template <class Alloc> 51 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20 52 template <class Alloc, class... U> 53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20 54 template <class Alloc> 55 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20 56 template <class Alloc> 57 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20 58 template<class Alloc, class... UTypes> 59 constexpr explicit(see-below) 60 tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23 61 template <class Alloc, class... U> 62 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20 63 template <class Alloc, class... U> 64 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20 65 template<class Alloc, class... UTypes> 66 constexpr explicit(see-below) 67 tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23 68 template<class Alloc, class U1, class U2> 69 constexpr explicit(see-below) 70 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23 71 template <class Alloc, class U1, class U2> 72 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20 73 template <class Alloc, class U1, class U2> 74 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20 75 template<class Alloc, class U1, class U2> 76 constexpr explicit(see-below) 77 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23 78 79 tuple& operator=(const tuple&); // constexpr in C++20 80 constexpr const tuple& operator=(const tuple&) const; // C++23 81 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20 82 constexpr const tuple& operator=(tuple&&) const; // C++23 83 template <class... U> 84 tuple& operator=(const tuple<U...>&); // constexpr in C++20 85 template<class... UTypes> 86 constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23 87 template <class... U> 88 tuple& operator=(tuple<U...>&&); // constexpr in C++20 89 template<class... UTypes> 90 constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23 91 template <class U1, class U2> 92 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20 93 template<class U1, class U2> 94 constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23 95 template <class U1, class U2> 96 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20 97 template<class U1, class U2> 98 constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23 99 100 template<class U, size_t N> 101 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION 102 template<class U, size_t N> 103 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION 104 105 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20 106 constexpr void swap(const tuple&) const noexcept(see-below); // C++23 107}; 108 109 110template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23 111 requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; } 112struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> { 113 using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; 114}; 115 116template<class... TTypes, class... UTypes> // since C++23 117 requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; } 118struct common_type<tuple<TTypes...>, tuple<UTypes...>> { 119 using type = tuple<common_type_t<TTypes, UTypes>...>; 120}; 121 122template <class ...T> 123tuple(T...) -> tuple<T...>; // since C++17 124template <class T1, class T2> 125tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17 126template <class Alloc, class ...T> 127tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17 128template <class Alloc, class T1, class T2> 129tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17 130template <class Alloc, class ...T> 131tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17 132 133inline constexpr unspecified ignore; 134 135template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 136template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 137template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 138template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 139 140// [tuple.apply], calling a function with a tuple of arguments: 141template <class F, class Tuple> 142 constexpr decltype(auto) apply(F&& f, Tuple&& t); // C++17 143template <class T, class Tuple> 144 constexpr T make_from_tuple(Tuple&& t); // C++17 145 146// 20.4.1.4, tuple helper classes: 147template <class T> struct tuple_size; // undefined 148template <class... T> struct tuple_size<tuple<T...>>; 149template <class T> 150 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 151template <size_t I, class T> struct tuple_element; // undefined 152template <size_t I, class... T> struct tuple_element<I, tuple<T...>>; 153template <size_t I, class T> 154 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 155 156// 20.4.1.5, element access: 157template <size_t I, class... T> 158 typename tuple_element<I, tuple<T...>>::type& 159 get(tuple<T...>&) noexcept; // constexpr in C++14 160template <size_t I, class... T> 161 const typename tuple_element<I, tuple<T...>>::type& 162 get(const tuple<T...>&) noexcept; // constexpr in C++14 163template <size_t I, class... T> 164 typename tuple_element<I, tuple<T...>>::type&& 165 get(tuple<T...>&&) noexcept; // constexpr in C++14 166template <size_t I, class... T> 167 const typename tuple_element<I, tuple<T...>>::type&& 168 get(const tuple<T...>&&) noexcept; // constexpr in C++14 169 170template <class T1, class... T> 171 constexpr T1& get(tuple<T...>&) noexcept; // C++14 172template <class T1, class... T> 173 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 174template <class T1, class... T> 175 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 176template <class T1, class... T> 177 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 178 179// 20.4.1.6, relational operators: 180template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 181template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 182template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 183template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 184template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 185template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 186template<class... T, class... U> 187 constexpr common_comparison_category_t<synth-three-way-result<T, U>...> 188 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20 189 190template <class... Types, class Alloc> 191 struct uses_allocator<tuple<Types...>, Alloc>; 192 193template <class... Types> 194 void 195 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 196 197template <class... Types> 198 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23 199 200} // std 201 202*/ 203 204#include <__assert> // all public C++ headers provide the assertion handler 205#include <__compare/common_comparison_category.h> 206#include <__compare/synth_three_way.h> 207#include <__config> 208#include <__functional/invoke.h> 209#include <__functional/unwrap_ref.h> 210#include <__fwd/array.h> 211#include <__memory/allocator_arg_t.h> 212#include <__memory/uses_allocator.h> 213#include <__type_traits/apply_cv.h> 214#include <__type_traits/common_reference.h> 215#include <__type_traits/common_type.h> 216#include <__type_traits/conditional.h> 217#include <__type_traits/conjunction.h> 218#include <__type_traits/copy_cvref.h> 219#include <__type_traits/disjunction.h> 220#include <__type_traits/is_arithmetic.h> 221#include <__type_traits/is_assignable.h> 222#include <__type_traits/is_constructible.h> 223#include <__type_traits/is_convertible.h> 224#include <__type_traits/is_copy_assignable.h> 225#include <__type_traits/is_copy_constructible.h> 226#include <__type_traits/is_default_constructible.h> 227#include <__type_traits/is_empty.h> 228#include <__type_traits/is_final.h> 229#include <__type_traits/is_implicitly_default_constructible.h> 230#include <__type_traits/is_move_assignable.h> 231#include <__type_traits/is_move_constructible.h> 232#include <__type_traits/is_nothrow_assignable.h> 233#include <__type_traits/is_nothrow_constructible.h> 234#include <__type_traits/is_nothrow_copy_assignable.h> 235#include <__type_traits/is_nothrow_copy_constructible.h> 236#include <__type_traits/is_nothrow_default_constructible.h> 237#include <__type_traits/is_nothrow_move_assignable.h> 238#include <__type_traits/is_reference.h> 239#include <__type_traits/is_same.h> 240#include <__type_traits/is_swappable.h> 241#include <__type_traits/lazy.h> 242#include <__type_traits/maybe_const.h> 243#include <__type_traits/nat.h> 244#include <__type_traits/negation.h> 245#include <__type_traits/remove_cvref.h> 246#include <__type_traits/remove_reference.h> 247#include <__utility/forward.h> 248#include <__utility/integer_sequence.h> 249#include <__utility/move.h> 250#include <__utility/pair.h> 251#include <__utility/piecewise_construct.h> 252#include <__utility/swap.h> 253#include <cstddef> 254#include <version> 255 256// standard-mandated includes 257 258// [tuple.syn] 259#include <compare> 260 261#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 262# pragma GCC system_header 263#endif 264 265_LIBCPP_BEGIN_NAMESPACE_STD 266 267#ifndef _LIBCPP_CXX03_LANG 268 269 270// __tuple_leaf 271 272template <size_t _Ip, class _Hp, 273 bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value 274 > 275class __tuple_leaf; 276 277template <size_t _Ip, class _Hp, bool _Ep> 278inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 279void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 280 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) 281{ 282 swap(__x.get(), __y.get()); 283} 284 285template <size_t _Ip, class _Hp, bool _Ep> 286_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 287void swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, const __tuple_leaf<_Ip, _Hp, _Ep>& __y) 288 _NOEXCEPT_(__is_nothrow_swappable<const _Hp>::value) { 289 swap(__x.get(), __y.get()); 290} 291 292template <size_t _Ip, class _Hp, bool> 293class __tuple_leaf 294{ 295 _Hp __value_; 296 297 template <class _Tp> 298 static constexpr bool __can_bind_reference() { 299#if __has_keyword(__reference_binds_to_temporary) 300 return !__reference_binds_to_temporary(_Hp, _Tp); 301#else 302 return true; 303#endif 304 } 305 306 _LIBCPP_CONSTEXPR_SINCE_CXX14 307 __tuple_leaf& operator=(const __tuple_leaf&); 308public: 309 _LIBCPP_INLINE_VISIBILITY constexpr __tuple_leaf() 310 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_() 311 {static_assert(!is_reference<_Hp>::value, 312 "Attempted to default construct a reference element in a tuple");} 313 314 template <class _Alloc> 315 _LIBCPP_INLINE_VISIBILITY constexpr 316 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) 317 : __value_() 318 {static_assert(!is_reference<_Hp>::value, 319 "Attempted to default construct a reference element in a tuple");} 320 321 template <class _Alloc> 322 _LIBCPP_INLINE_VISIBILITY constexpr 323 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 324 : __value_(allocator_arg_t(), __a) 325 {static_assert(!is_reference<_Hp>::value, 326 "Attempted to default construct a reference element in a tuple");} 327 328 template <class _Alloc> 329 _LIBCPP_INLINE_VISIBILITY constexpr 330 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 331 : __value_(__a) 332 {static_assert(!is_reference<_Hp>::value, 333 "Attempted to default construct a reference element in a tuple");} 334 335 template <class _Tp, 336 class = __enable_if_t< 337 _And< 338 _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, 339 is_constructible<_Hp, _Tp> 340 >::value 341 > 342 > 343 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 344 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 345 : __value_(_VSTD::forward<_Tp>(__t)) 346 {static_assert(__can_bind_reference<_Tp&&>(), 347 "Attempted construction of reference element binds to a temporary whose lifetime has ended");} 348 349 template <class _Tp, class _Alloc> 350 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 351 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 352 : __value_(_VSTD::forward<_Tp>(__t)) 353 {static_assert(__can_bind_reference<_Tp&&>(), 354 "Attempted construction of reference element binds to a temporary whose lifetime has ended");} 355 356 template <class _Tp, class _Alloc> 357 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 358 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 359 : __value_(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) 360 {static_assert(!is_reference<_Hp>::value, 361 "Attempted to uses-allocator construct a reference element in a tuple");} 362 363 template <class _Tp, class _Alloc> 364 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 365 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 366 : __value_(_VSTD::forward<_Tp>(__t), __a) 367 {static_assert(!is_reference<_Hp>::value, 368 "Attempted to uses-allocator construct a reference element in a tuple");} 369 370 __tuple_leaf(const __tuple_leaf& __t) = default; 371 __tuple_leaf(__tuple_leaf&& __t) = default; 372 373 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 374 int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 375 { 376 _VSTD::swap(*this, __t); 377 return 0; 378 } 379 380 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 381 int swap(const __tuple_leaf& __t) const _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 382 _VSTD::swap(*this, __t); 383 return 0; 384 } 385 386 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT {return __value_;} 387 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT {return __value_;} 388}; 389 390template <size_t _Ip, class _Hp> 391class __tuple_leaf<_Ip, _Hp, true> 392 : private _Hp 393{ 394 _LIBCPP_CONSTEXPR_SINCE_CXX14 395 __tuple_leaf& operator=(const __tuple_leaf&); 396public: 397 _LIBCPP_INLINE_VISIBILITY constexpr __tuple_leaf() 398 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 399 400 template <class _Alloc> 401 _LIBCPP_INLINE_VISIBILITY constexpr 402 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 403 404 template <class _Alloc> 405 _LIBCPP_INLINE_VISIBILITY constexpr 406 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 407 : _Hp(allocator_arg_t(), __a) {} 408 409 template <class _Alloc> 410 _LIBCPP_INLINE_VISIBILITY constexpr 411 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 412 : _Hp(__a) {} 413 414 template <class _Tp, 415 class = __enable_if_t< 416 _And< 417 _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, 418 is_constructible<_Hp, _Tp> 419 >::value 420 > 421 > 422 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 423 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 424 : _Hp(_VSTD::forward<_Tp>(__t)) {} 425 426 template <class _Tp, class _Alloc> 427 _LIBCPP_INLINE_VISIBILITY constexpr 428 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 429 : _Hp(_VSTD::forward<_Tp>(__t)) {} 430 431 template <class _Tp, class _Alloc> 432 _LIBCPP_INLINE_VISIBILITY constexpr 433 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 434 : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {} 435 436 template <class _Tp, class _Alloc> 437 _LIBCPP_INLINE_VISIBILITY constexpr 438 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 439 : _Hp(_VSTD::forward<_Tp>(__t), __a) {} 440 441 __tuple_leaf(__tuple_leaf const &) = default; 442 __tuple_leaf(__tuple_leaf &&) = default; 443 444 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 445 int 446 swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 447 { 448 _VSTD::swap(*this, __t); 449 return 0; 450 } 451 452 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 453 int swap(const __tuple_leaf& __rhs) const _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 454 _VSTD::swap(*this, __rhs); 455 return 0; 456 } 457 458 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);} 459 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);} 460}; 461 462template <class ..._Tp> 463_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 464void __swallow(_Tp&&...) _NOEXCEPT {} 465 466template <class _Tp> 467struct __all_default_constructible; 468 469template <class ..._Tp> 470struct __all_default_constructible<__tuple_types<_Tp...>> 471 : __all<is_default_constructible<_Tp>::value...> 472{ }; 473 474// __tuple_impl 475 476template<class _Indx, class ..._Tp> struct __tuple_impl; 477 478template<size_t ..._Indx, class ..._Tp> 479struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 480 : public __tuple_leaf<_Indx, _Tp>... 481{ 482 _LIBCPP_INLINE_VISIBILITY 483 constexpr __tuple_impl() 484 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 485 486 template <size_t ..._Uf, class ..._Tf, 487 size_t ..._Ul, class ..._Tl, class ..._Up> 488 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 489 explicit 490 __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>, 491 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 492 _Up&&... __u) 493 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 494 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) : 495 __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))..., 496 __tuple_leaf<_Ul, _Tl>()... 497 {} 498 499 template <class _Alloc, size_t ..._Uf, class ..._Tf, 500 size_t ..._Ul, class ..._Tl, class ..._Up> 501 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 502 explicit 503 __tuple_impl(allocator_arg_t, const _Alloc& __a, 504 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, 505 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 506 _Up&&... __u) : 507 __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, 508 _VSTD::forward<_Up>(__u))..., 509 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... 510 {} 511 512 template <class _Tuple, 513 class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> 514 > 515 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 516 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx, 517 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 518 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx, 519 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 520 {} 521 522 template <class _Alloc, class _Tuple, 523 class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> 524 > 525 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 526 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 527 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx, 528 typename __make_tuple_types<_Tuple>::type>::type>(), __a, 529 _VSTD::forward<typename tuple_element<_Indx, 530 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 531 {} 532 533 __tuple_impl(const __tuple_impl&) = default; 534 __tuple_impl(__tuple_impl&&) = default; 535 536 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 537 void swap(__tuple_impl& __t) 538 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 539 { 540 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 541 } 542 543 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 544 void swap(const __tuple_impl& __t) const 545 _NOEXCEPT_(__all<__is_nothrow_swappable<const _Tp>::value...>::value) 546 { 547 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 548 } 549}; 550 551template<class _Dest, class _Source, size_t ..._Np> 552_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 553void __memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 554 _VSTD::__swallow(((_VSTD::get<_Np>(__dest) = _VSTD::get<_Np>(__source)), void(), 0)...); 555} 556 557template<class _Dest, class _Source, class ..._Up, size_t ..._Np> 558_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 559void __memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 560 _VSTD::__swallow((( 561 _VSTD::get<_Np>(__dest) = _VSTD::forward<_Up>(_VSTD::get<_Np>(__source)) 562 ), void(), 0)...); 563} 564 565template <class ..._Tp> 566class _LIBCPP_TEMPLATE_VIS tuple 567{ 568 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 569 570 _BaseT __base_; 571 572 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_SINCE_CXX14 573 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 574 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_SINCE_CXX14 575 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT; 576 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_SINCE_CXX14 577 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT; 578 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_SINCE_CXX14 579 const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT; 580public: 581 // [tuple.cnstr] 582 583 // tuple() constructors (including allocator_arg_t variants) 584 template <template<class...> class _IsImpDefault = __is_implicitly_default_constructible, __enable_if_t< 585 _And< 586 _IsImpDefault<_Tp>... // explicit check 587 >::value 588 , int> = 0> 589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 590 tuple() 591 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) 592 { } 593 594 template <template<class...> class _IsImpDefault = __is_implicitly_default_constructible, 595 template<class...> class _IsDefault = is_default_constructible, __enable_if_t< 596 _And< 597 _IsDefault<_Tp>..., 598 _Not<_Lazy<_And, _IsImpDefault<_Tp>...> > // explicit check 599 >::value 600 , int> = 0> 601 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 602 explicit tuple() 603 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) 604 { } 605 606 template <class _Alloc, template<class...> class _IsImpDefault = __is_implicitly_default_constructible, __enable_if_t< 607 _And< 608 _IsImpDefault<_Tp>... // explicit check 609 >::value 610 , int> = 0> 611 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 612 tuple(allocator_arg_t, _Alloc const& __a) 613 : __base_(allocator_arg_t(), __a, 614 __tuple_indices<>(), __tuple_types<>(), 615 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 616 __tuple_types<_Tp...>()) {} 617 618 template <class _Alloc, 619 template<class...> class _IsImpDefault = __is_implicitly_default_constructible, 620 template<class...> class _IsDefault = is_default_constructible, __enable_if_t< 621 _And< 622 _IsDefault<_Tp>..., 623 _Not<_Lazy<_And, _IsImpDefault<_Tp>...> > // explicit check 624 >::value 625 , int> = 0> 626 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 627 explicit tuple(allocator_arg_t, _Alloc const& __a) 628 : __base_(allocator_arg_t(), __a, 629 __tuple_indices<>(), __tuple_types<>(), 630 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 631 __tuple_types<_Tp...>()) {} 632 633 // tuple(const T&...) constructors (including allocator_arg_t variants) 634 template <template<class...> class _And = _And, __enable_if_t< 635 _And< 636 _BoolConstant<sizeof...(_Tp) >= 1>, 637 is_copy_constructible<_Tp>..., 638 is_convertible<const _Tp&, _Tp>... // explicit check 639 >::value 640 , int> = 0> 641 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 642 tuple(const _Tp& ... __t) 643 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 644 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 645 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 646 typename __make_tuple_indices<0>::type(), 647 typename __make_tuple_types<tuple, 0>::type(), 648 __t... 649 ) {} 650 651 template <template<class...> class _And = _And, __enable_if_t< 652 _And< 653 _BoolConstant<sizeof...(_Tp) >= 1>, 654 is_copy_constructible<_Tp>..., 655 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> > // explicit check 656 >::value 657 , int> = 0> 658 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 659 explicit tuple(const _Tp& ... __t) 660 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 661 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 662 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 663 typename __make_tuple_indices<0>::type(), 664 typename __make_tuple_types<tuple, 0>::type(), 665 __t... 666 ) {} 667 668 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 669 _And< 670 _BoolConstant<sizeof...(_Tp) >= 1>, 671 is_copy_constructible<_Tp>..., 672 is_convertible<const _Tp&, _Tp>... // explicit check 673 >::value 674 , int> = 0> 675 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 676 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 677 : __base_(allocator_arg_t(), __a, 678 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 679 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 680 typename __make_tuple_indices<0>::type(), 681 typename __make_tuple_types<tuple, 0>::type(), 682 __t... 683 ) {} 684 685 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 686 _And< 687 _BoolConstant<sizeof...(_Tp) >= 1>, 688 is_copy_constructible<_Tp>..., 689 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> > // explicit check 690 >::value 691 , int> = 0> 692 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 693 explicit tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 694 : __base_(allocator_arg_t(), __a, 695 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 696 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 697 typename __make_tuple_indices<0>::type(), 698 typename __make_tuple_types<tuple, 0>::type(), 699 __t... 700 ) {} 701 702 // tuple(U&& ...) constructors (including allocator_arg_t variants) 703 template <class ..._Up> struct _IsThisTuple : false_type { }; 704 template <class _Up> struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> { }; 705 706 template <class ..._Up> 707 struct _EnableUTypesCtor : _And< 708 _BoolConstant<sizeof...(_Tp) >= 1>, 709 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 710 is_constructible<_Tp, _Up>... 711 > { }; 712 713 template <class ..._Up, __enable_if_t< 714 _And< 715 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 716 _EnableUTypesCtor<_Up...>, 717 is_convertible<_Up, _Tp>... // explicit check 718 >::value 719 , int> = 0> 720 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 721 tuple(_Up&&... __u) 722 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 723 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 724 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 725 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 726 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 727 _VSTD::forward<_Up>(__u)...) {} 728 729 template <class ..._Up, __enable_if_t< 730 _And< 731 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 732 _EnableUTypesCtor<_Up...>, 733 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 734 >::value 735 , int> = 0> 736 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 737 explicit tuple(_Up&&... __u) 738 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 739 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 740 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 741 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 742 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 743 _VSTD::forward<_Up>(__u)...) {} 744 745 template <class _Alloc, class ..._Up, __enable_if_t< 746 _And< 747 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 748 _EnableUTypesCtor<_Up...>, 749 is_convertible<_Up, _Tp>... // explicit check 750 >::value 751 , int> = 0> 752 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 753 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 754 : __base_(allocator_arg_t(), __a, 755 typename __make_tuple_indices<sizeof...(_Up)>::type(), 756 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 757 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 758 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 759 _VSTD::forward<_Up>(__u)...) {} 760 761 template <class _Alloc, class ..._Up, __enable_if_t< 762 _And< 763 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 764 _EnableUTypesCtor<_Up...>, 765 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 766 >::value 767 , int> = 0> 768 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 769 explicit tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 770 : __base_(allocator_arg_t(), __a, 771 typename __make_tuple_indices<sizeof...(_Up)>::type(), 772 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 773 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 774 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 775 _VSTD::forward<_Up>(__u)...) {} 776 777 // Copy and move constructors (including the allocator_arg_t variants) 778 tuple(const tuple&) = default; 779 tuple(tuple&&) = default; 780 781 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 782 _And<is_copy_constructible<_Tp>...>::value 783 , int> = 0> 784 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 785 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 786 : __base_(allocator_arg_t(), __alloc, __t) 787 { } 788 789 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 790 _And<is_move_constructible<_Tp>...>::value 791 , int> = 0> 792 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 793 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 794 : __base_(allocator_arg_t(), __alloc, _VSTD::move(__t)) 795 { } 796 797 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 798 799 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void> 800 struct _EnableCtorFromUTypesTuple : false_type {}; 801 802 template <class _OtherTuple, class... _Up> 803 struct _EnableCtorFromUTypesTuple<_OtherTuple, tuple<_Up...>, 804 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 805 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> : _And< 806 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor can work. 807 // Otherwise, is_constructible can trigger hard error in those cases https://godbolt.org/z/M94cGdKcE 808 _Not<is_same<_OtherTuple, const tuple&> >, 809 _Not<is_same<_OtherTuple, tuple&&> >, 810 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 811 _Lazy<_Or, _BoolConstant<sizeof...(_Tp) != 1>, 812 // _Tp and _Up are 1-element packs - the pack expansions look 813 // weird to avoid tripping up the type traits in degenerate cases 814 _Lazy<_And, 815 _Not<is_same<_Tp, _Up> >..., 816 _Not<is_convertible<_OtherTuple, _Tp> >..., 817 _Not<is_constructible<_Tp, _OtherTuple> >... 818 > 819 > 820 > {}; 821 822 template <class ..._Up, __enable_if_t< 823 _And< 824 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 825 is_convertible<const _Up&, _Tp>... // explicit check 826 >::value 827 , int> = 0> 828 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 829 tuple(const tuple<_Up...>& __t) 830 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 831 : __base_(__t) 832 { } 833 834 template <class ..._Up, __enable_if_t< 835 _And< 836 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 837 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> > // explicit check 838 >::value 839 , int> = 0> 840 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 841 explicit tuple(const tuple<_Up...>& __t) 842 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 843 : __base_(__t) 844 { } 845 846 template <class ..._Up, class _Alloc, __enable_if_t< 847 _And< 848 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 849 is_convertible<const _Up&, _Tp>... // explicit check 850 >::value 851 , int> = 0> 852 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 853 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 854 : __base_(allocator_arg_t(), __a, __t) 855 { } 856 857 template <class ..._Up, class _Alloc, __enable_if_t< 858 _And< 859 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 860 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> > // explicit check 861 >::value 862 , int> = 0> 863 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 864 explicit tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 865 : __base_(allocator_arg_t(), __a, __t) 866 { } 867 868#if _LIBCPP_STD_VER > 20 869 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 870 871 template <class... _Up, enable_if_t< 872 _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 873 _LIBCPP_HIDE_FROM_ABI constexpr 874 explicit(!(is_convertible_v<_Up&, _Tp> && ...)) 875 tuple(tuple<_Up...>& __t) : __base_(__t) {} 876 877 template <class _Alloc, class... _Up, enable_if_t< 878 _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 879 _LIBCPP_HIDE_FROM_ABI constexpr 880 explicit(!(is_convertible_v<_Up&, _Tp> && ...)) 881 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) : __base_(allocator_arg_t(), __alloc, __t) {} 882#endif // _LIBCPP_STD_VER > 20 883 884 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 885 886 template <class ..._Up, __enable_if_t< 887 _And< 888 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 889 is_convertible<_Up, _Tp>... // explicit check 890 >::value 891 , int> = 0> 892 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 893 tuple(tuple<_Up...>&& __t) 894 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 895 : __base_(_VSTD::move(__t)) 896 { } 897 898 template <class ..._Up, __enable_if_t< 899 _And< 900 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 901 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 902 >::value 903 , int> = 0> 904 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 905 explicit tuple(tuple<_Up...>&& __t) 906 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 907 : __base_(_VSTD::move(__t)) 908 { } 909 910 template <class _Alloc, class ..._Up, __enable_if_t< 911 _And< 912 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 913 is_convertible<_Up, _Tp>... // explicit check 914 >::value 915 , int> = 0> 916 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 917 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 918 : __base_(allocator_arg_t(), __a, _VSTD::move(__t)) 919 { } 920 921 template <class _Alloc, class ..._Up, __enable_if_t< 922 _And< 923 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 924 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 925 >::value 926 , int> = 0> 927 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 928 explicit tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 929 : __base_(allocator_arg_t(), __a, _VSTD::move(__t)) 930 { } 931 932#if _LIBCPP_STD_VER > 20 933 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 934 935 template <class... _Up, enable_if_t< 936 _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 937 _LIBCPP_HIDE_FROM_ABI constexpr 938 explicit(!(is_convertible_v<const _Up&&, _Tp> && ...)) 939 tuple(const tuple<_Up...>&& __t) : __base_(std::move(__t)) {} 940 941 template <class _Alloc, class... _Up, enable_if_t< 942 _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 943 _LIBCPP_HIDE_FROM_ABI constexpr 944 explicit(!(is_convertible_v<const _Up&&, _Tp> && ...)) 945 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 946 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 947#endif // _LIBCPP_STD_VER > 20 948 949 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 950 951 template <template <class...> class Pred, class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 952 struct _CtorPredicateFromPair : false_type{}; 953 954 template <template <class...> class Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 955 struct _CtorPredicateFromPair<Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : _And< 956 Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, 957 Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > 958 > {}; 959 960 template <class _Pair> 961 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair>{}; 962 963 template <class _Pair> 964 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair>{}; 965 966 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 967 struct _BothImplicitlyConvertible : false_type{}; 968 969 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 970 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : _And< 971 is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, 972 is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> 973 > {}; 974 975 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 976 _And< 977 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 978 _BothImplicitlyConvertible<const pair<_Up1, _Up2>&> // explicit check 979 >::value 980 , int> = 0> 981 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 982 tuple(const pair<_Up1, _Up2>& __p) 983 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 984 : __base_(__p) 985 { } 986 987 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 988 _And< 989 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 990 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> > // explicit check 991 >::value 992 , int> = 0> 993 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 994 explicit tuple(const pair<_Up1, _Up2>& __p) 995 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 996 : __base_(__p) 997 { } 998 999 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1000 _And< 1001 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 1002 _BothImplicitlyConvertible<const pair<_Up1, _Up2>&> // explicit check 1003 >::value 1004 , int> = 0> 1005 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1006 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 1007 : __base_(allocator_arg_t(), __a, __p) 1008 { } 1009 1010 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1011 _And< 1012 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 1013 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> > // explicit check 1014 >::value 1015 , int> = 0> 1016 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1017 explicit tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 1018 : __base_(allocator_arg_t(), __a, __p) 1019 { } 1020 1021#if _LIBCPP_STD_VER > 20 1022 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 1023 1024 template <class _U1, class _U2, enable_if_t< 1025 _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 1026 _LIBCPP_HIDE_FROM_ABI constexpr 1027 explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 1028 tuple(pair<_U1, _U2>& __p) : __base_(__p) {} 1029 1030 template <class _Alloc, class _U1, class _U2, enable_if_t< 1031 _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 1032 _LIBCPP_HIDE_FROM_ABI constexpr 1033 explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 1034 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) : __base_(allocator_arg_t(), __alloc, __p) {} 1035#endif 1036 1037 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 1038 1039 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1040 _And< 1041 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1042 _BothImplicitlyConvertible<pair<_Up1, _Up2>&&> // explicit check 1043 >::value 1044 , int> = 0> 1045 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1046 tuple(pair<_Up1, _Up2>&& __p) 1047 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 1048 : __base_(_VSTD::move(__p)) 1049 { } 1050 1051 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1052 _And< 1053 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1054 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> > // explicit check 1055 >::value 1056 , int> = 0> 1057 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1058 explicit tuple(pair<_Up1, _Up2>&& __p) 1059 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 1060 : __base_(_VSTD::move(__p)) 1061 { } 1062 1063 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1064 _And< 1065 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1066 _BothImplicitlyConvertible<pair<_Up1, _Up2>&&> // explicit check 1067 >::value 1068 , int> = 0> 1069 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1070 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 1071 : __base_(allocator_arg_t(), __a, _VSTD::move(__p)) 1072 { } 1073 1074 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1075 _And< 1076 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1077 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> > // explicit check 1078 >::value 1079 , int> = 0> 1080 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1081 explicit tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 1082 : __base_(allocator_arg_t(), __a, _VSTD::move(__p)) 1083 { } 1084 1085#if _LIBCPP_STD_VER > 20 1086 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 1087 1088 template <class _U1, class _U2, enable_if_t< 1089 _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 1090 _LIBCPP_HIDE_FROM_ABI constexpr 1091 explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 1092 tuple(const pair<_U1, _U2>&& __p) : __base_(std::move(__p)) {} 1093 1094 template <class _Alloc, class _U1, class _U2, enable_if_t< 1095 _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 1096 _LIBCPP_HIDE_FROM_ABI constexpr 1097 explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 1098 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 1099 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 1100#endif // _LIBCPP_STD_VER > 20 1101 1102 // [tuple.assign] 1103 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1104 tuple& operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 1105 _NOEXCEPT_((_And<is_nothrow_copy_assignable<_Tp>...>::value)) 1106 { 1107 _VSTD::__memberwise_copy_assign(*this, __tuple, 1108 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1109 return *this; 1110 } 1111 1112#if _LIBCPP_STD_VER > 20 1113 _LIBCPP_HIDE_FROM_ABI constexpr 1114 const tuple& operator=(tuple const& __tuple) const 1115 requires (_And<is_copy_assignable<const _Tp>...>::value) { 1116 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1117 return *this; 1118 } 1119 1120 _LIBCPP_HIDE_FROM_ABI constexpr 1121 const tuple& operator=(tuple&& __tuple) const 1122 requires (_And<is_assignable<const _Tp&, _Tp>...>::value) { 1123 std::__memberwise_forward_assign(*this, 1124 std::move(__tuple), 1125 __tuple_types<_Tp...>(), 1126 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1127 return *this; 1128 } 1129#endif // _LIBCPP_STD_VER > 20 1130 1131 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1132 tuple& operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 1133 _NOEXCEPT_((_And<is_nothrow_move_assignable<_Tp>...>::value)) 1134 { 1135 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 1136 __tuple_types<_Tp...>(), 1137 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1138 return *this; 1139 } 1140 1141 template<class... _Up, __enable_if_t< 1142 _And< 1143 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 1144 is_assignable<_Tp&, _Up const&>... 1145 >::value 1146 ,int> = 0> 1147 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1148 tuple& operator=(tuple<_Up...> const& __tuple) 1149 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 1150 { 1151 _VSTD::__memberwise_copy_assign(*this, __tuple, 1152 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1153 return *this; 1154 } 1155 1156 template<class... _Up, __enable_if_t< 1157 _And< 1158 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 1159 is_assignable<_Tp&, _Up>... 1160 >::value 1161 ,int> = 0> 1162 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1163 tuple& operator=(tuple<_Up...>&& __tuple) 1164 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1165 { 1166 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 1167 __tuple_types<_Up...>(), 1168 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1169 return *this; 1170 } 1171 1172 1173#if _LIBCPP_STD_VER > 20 1174 template <class... _UTypes, enable_if_t< 1175 _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 1176 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 1177 _LIBCPP_HIDE_FROM_ABI constexpr 1178 const tuple& operator=(const tuple<_UTypes...>& __u) const { 1179 std::__memberwise_copy_assign(*this, 1180 __u, 1181 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1182 return *this; 1183 } 1184 1185 template <class... _UTypes, enable_if_t< 1186 _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 1187 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 1188 _LIBCPP_HIDE_FROM_ABI constexpr 1189 const tuple& operator=(tuple<_UTypes...>&& __u) const { 1190 std::__memberwise_forward_assign(*this, 1191 __u, 1192 __tuple_types<_UTypes...>(), 1193 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1194 return *this; 1195 } 1196#endif // _LIBCPP_STD_VER > 20 1197 1198 template <template<class...> class Pred, bool _Const, 1199 class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 1200 struct _AssignPredicateFromPair : false_type {}; 1201 1202 template <template<class...> class Pred, bool _Const, 1203 class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 1204 struct _AssignPredicateFromPair<Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : 1205 _And<Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 1206 Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > 1207 > {}; 1208 1209 template <bool _Const, class _Pair> 1210 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 1211 1212 template <bool _Const, class _Pair> 1213 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 1214 1215#if _LIBCPP_STD_VER > 20 1216 template <class _U1, class _U2, enable_if_t< 1217 _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 1218 _LIBCPP_HIDE_FROM_ABI constexpr 1219 const tuple& operator=(const pair<_U1, _U2>& __pair) const 1220 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 1221 std::get<0>(*this) = __pair.first; 1222 std::get<1>(*this) = __pair.second; 1223 return *this; 1224 } 1225 1226 template <class _U1, class _U2, enable_if_t< 1227 _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 1228 _LIBCPP_HIDE_FROM_ABI constexpr 1229 const tuple& operator=(pair<_U1, _U2>&& __pair) const 1230 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 1231 std::get<0>(*this) = std::move(__pair.first); 1232 std::get<1>(*this) = std::move(__pair.second); 1233 return *this; 1234 } 1235#endif // _LIBCPP_STD_VER > 20 1236 1237 template<class _Up1, class _Up2, __enable_if_t< 1238 _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value 1239 ,int> = 0> 1240 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1241 tuple& operator=(pair<_Up1, _Up2> const& __pair) 1242 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value)) 1243 { 1244 _VSTD::get<0>(*this) = __pair.first; 1245 _VSTD::get<1>(*this) = __pair.second; 1246 return *this; 1247 } 1248 1249 template<class _Up1, class _Up2, __enable_if_t< 1250 _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value 1251 ,int> = 0> 1252 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1253 tuple& operator=(pair<_Up1, _Up2>&& __pair) 1254 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value)) 1255 { 1256 _VSTD::get<0>(*this) = _VSTD::forward<_Up1>(__pair.first); 1257 _VSTD::get<1>(*this) = _VSTD::forward<_Up2>(__pair.second); 1258 return *this; 1259 } 1260 1261 // EXTENSION 1262 template<class _Up, size_t _Np, class = __enable_if_t< 1263 _And< 1264 _BoolConstant<_Np == sizeof...(_Tp)>, 1265 is_assignable<_Tp&, _Up const&>... 1266 >::value 1267 > > 1268 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1269 tuple& operator=(array<_Up, _Np> const& __array) 1270 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 1271 { 1272 _VSTD::__memberwise_copy_assign(*this, __array, 1273 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1274 return *this; 1275 } 1276 1277 // EXTENSION 1278 template<class _Up, size_t _Np, class = void, class = __enable_if_t< 1279 _And< 1280 _BoolConstant<_Np == sizeof...(_Tp)>, 1281 is_assignable<_Tp&, _Up>... 1282 >::value 1283 > > 1284 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1285 tuple& operator=(array<_Up, _Np>&& __array) 1286 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1287 { 1288 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__array), 1289 __tuple_types<_If<true, _Up, _Tp>...>(), 1290 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1291 return *this; 1292 } 1293 1294 // [tuple.swap] 1295 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1296 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1297 {__base_.swap(__t.__base_);} 1298 1299#if _LIBCPP_STD_VER > 20 1300 _LIBCPP_HIDE_FROM_ABI constexpr 1301 void swap(const tuple& __t) const noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 1302 __base_.swap(__t.__base_); 1303 } 1304#endif // _LIBCPP_STD_VER > 20 1305}; 1306 1307template <> 1308class _LIBCPP_TEMPLATE_VIS tuple<> 1309{ 1310public: 1311 _LIBCPP_INLINE_VISIBILITY constexpr 1312 tuple() _NOEXCEPT = default; 1313 template <class _Alloc> 1314 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1315 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1316 template <class _Alloc> 1317 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1318 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1319 template <class _Up> 1320 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1321 tuple(array<_Up, 0>) _NOEXCEPT {} 1322 template <class _Alloc, class _Up> 1323 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1324 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1325 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1326 void swap(tuple&) _NOEXCEPT {} 1327#if _LIBCPP_STD_VER > 20 1328 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1329#endif 1330}; 1331 1332#if _LIBCPP_STD_VER > 20 1333template <class... _TTypes, class... _UTypes, template<class> class _TQual, template<class> class _UQual> 1334 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1335struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1336 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1337}; 1338 1339template <class... _TTypes, class... _UTypes> 1340 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1341struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1342 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1343}; 1344#endif // _LIBCPP_STD_VER > 20 1345 1346#if _LIBCPP_STD_VER > 14 1347template <class ..._Tp> 1348tuple(_Tp...) -> tuple<_Tp...>; 1349template <class _Tp1, class _Tp2> 1350tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1351template <class _Alloc, class ..._Tp> 1352tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1353template <class _Alloc, class _Tp1, class _Tp2> 1354tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1355template <class _Alloc, class ..._Tp> 1356tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1357#endif 1358 1359template <class ..._Tp> 1360inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1361__enable_if_t<__all<__is_swappable<_Tp>::value...>::value, void> 1362swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1363 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1364 {__t.swap(__u);} 1365 1366#if _LIBCPP_STD_VER > 20 1367template <class... _Tp> 1368_LIBCPP_HIDE_FROM_ABI constexpr 1369enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1370swap(const tuple<_Tp...>& __lhs, const tuple<_Tp...>& __rhs) 1371 noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1372 __lhs.swap(__rhs); 1373} 1374#endif 1375 1376// get 1377 1378template <size_t _Ip, class ..._Tp> 1379inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1380typename tuple_element<_Ip, tuple<_Tp...> >::type& 1381get(tuple<_Tp...>& __t) _NOEXCEPT 1382{ 1383 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1384 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1385} 1386 1387template <size_t _Ip, class ..._Tp> 1388inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1389const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1390get(const tuple<_Tp...>& __t) _NOEXCEPT 1391{ 1392 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1393 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1394} 1395 1396template <size_t _Ip, class ..._Tp> 1397inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1398typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1399get(tuple<_Tp...>&& __t) _NOEXCEPT 1400{ 1401 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1402 return static_cast<type&&>( 1403 static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1404} 1405 1406template <size_t _Ip, class ..._Tp> 1407inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1408const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1409get(const tuple<_Tp...>&& __t) _NOEXCEPT 1410{ 1411 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1412 return static_cast<const type&&>( 1413 static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1414} 1415 1416#if _LIBCPP_STD_VER > 11 1417 1418namespace __find_detail { 1419 1420static constexpr size_t __not_found = static_cast<size_t>(-1); 1421static constexpr size_t __ambiguous = __not_found - 1; 1422 1423inline _LIBCPP_INLINE_VISIBILITY 1424constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { 1425 return !__matches ? __res : 1426 (__res == __not_found ? __curr_i : __ambiguous); 1427} 1428 1429template <size_t _Nx> 1430inline _LIBCPP_INLINE_VISIBILITY 1431constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { 1432 return __i == _Nx ? __not_found : 1433 __find_detail::__find_idx_return(__i, __find_detail::__find_idx(__i + 1, __matches), __matches[__i]); 1434} 1435 1436template <class _T1, class ..._Args> 1437struct __find_exactly_one_checked { 1438 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; 1439 static constexpr size_t value = __find_detail::__find_idx(0, __matches); 1440 static_assert(value != __not_found, "type not found in type list" ); 1441 static_assert(value != __ambiguous, "type occurs more than once in type list"); 1442}; 1443 1444template <class _T1> 1445struct __find_exactly_one_checked<_T1> { 1446 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); 1447}; 1448 1449} // namespace __find_detail 1450 1451template <typename _T1, typename... _Args> 1452struct __find_exactly_one_t 1453 : public __find_detail::__find_exactly_one_checked<_T1, _Args...> { 1454}; 1455 1456template <class _T1, class... _Args> 1457inline _LIBCPP_INLINE_VISIBILITY 1458constexpr _T1& get(tuple<_Args...>& __tup) noexcept 1459{ 1460 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1461} 1462 1463template <class _T1, class... _Args> 1464inline _LIBCPP_INLINE_VISIBILITY 1465constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept 1466{ 1467 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1468} 1469 1470template <class _T1, class... _Args> 1471inline _LIBCPP_INLINE_VISIBILITY 1472constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept 1473{ 1474 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1475} 1476 1477template <class _T1, class... _Args> 1478inline _LIBCPP_INLINE_VISIBILITY 1479constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept 1480{ 1481 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1482} 1483 1484#endif 1485 1486// tie 1487 1488template <class ..._Tp> 1489inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1490tuple<_Tp&...> 1491tie(_Tp&... __t) _NOEXCEPT 1492{ 1493 return tuple<_Tp&...>(__t...); 1494} 1495 1496template <class _Up> 1497struct __ignore_t 1498{ 1499 template <class _Tp> 1500 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1501 const __ignore_t& operator=(_Tp&&) const {return *this;} 1502}; 1503 1504namespace { 1505 constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1506} // namespace 1507 1508template <class... _Tp> 1509inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1510tuple<typename __unwrap_ref_decay<_Tp>::type...> 1511make_tuple(_Tp&&... __t) 1512{ 1513 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...); 1514} 1515 1516template <class... _Tp> 1517inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1518tuple<_Tp&&...> 1519forward_as_tuple(_Tp&&... __t) _NOEXCEPT 1520{ 1521 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...); 1522} 1523 1524template <size_t _Ip> 1525struct __tuple_equal 1526{ 1527 template <class _Tp, class _Up> 1528 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1529 bool operator()(const _Tp& __x, const _Up& __y) 1530 { 1531 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y); 1532 } 1533}; 1534 1535template <> 1536struct __tuple_equal<0> 1537{ 1538 template <class _Tp, class _Up> 1539 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1540 bool operator()(const _Tp&, const _Up&) 1541 { 1542 return true; 1543 } 1544}; 1545 1546template <class ..._Tp, class ..._Up> 1547inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1548bool 1549operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1550{ 1551 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1552 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1553} 1554 1555#if _LIBCPP_STD_VER > 17 1556 1557// operator<=> 1558 1559template <class ..._Tp, class ..._Up, size_t ..._Is> 1560_LIBCPP_HIDE_FROM_ABI constexpr 1561auto 1562__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1563 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1564 static_cast<void>(((__result = _VSTD::__synth_three_way(_VSTD::get<_Is>(__x), _VSTD::get<_Is>(__y)), __result != 0) || ...)); 1565 return __result; 1566} 1567 1568template <class ..._Tp, class ..._Up> 1569requires (sizeof...(_Tp) == sizeof...(_Up)) 1570_LIBCPP_HIDE_FROM_ABI constexpr 1571common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1572operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1573{ 1574 return _VSTD::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1575} 1576 1577#else // _LIBCPP_STD_VER > 17 1578 1579template <class ..._Tp, class ..._Up> 1580inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1581bool 1582operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1583{ 1584 return !(__x == __y); 1585} 1586 1587template <size_t _Ip> 1588struct __tuple_less 1589{ 1590 template <class _Tp, class _Up> 1591 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1592 bool operator()(const _Tp& __x, const _Up& __y) 1593 { 1594 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1595 if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y)) 1596 return true; 1597 if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x)) 1598 return false; 1599 return __tuple_less<_Ip-1>()(__x, __y); 1600 } 1601}; 1602 1603template <> 1604struct __tuple_less<0> 1605{ 1606 template <class _Tp, class _Up> 1607 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1608 bool operator()(const _Tp&, const _Up&) 1609 { 1610 return false; 1611 } 1612}; 1613 1614template <class ..._Tp, class ..._Up> 1615inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1616bool 1617operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1618{ 1619 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1620 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1621} 1622 1623template <class ..._Tp, class ..._Up> 1624inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1625bool 1626operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1627{ 1628 return __y < __x; 1629} 1630 1631template <class ..._Tp, class ..._Up> 1632inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1633bool 1634operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1635{ 1636 return !(__x < __y); 1637} 1638 1639template <class ..._Tp, class ..._Up> 1640inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1641bool 1642operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1643{ 1644 return !(__y < __x); 1645} 1646 1647#endif // _LIBCPP_STD_VER > 17 1648 1649// tuple_cat 1650 1651template <class _Tp, class _Up> struct __tuple_cat_type; 1652 1653template <class ..._Ttypes, class ..._Utypes> 1654struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > 1655{ 1656 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1657}; 1658 1659template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples> 1660struct __tuple_cat_return_1 1661{ 1662}; 1663 1664template <class ..._Types, class _Tuple0> 1665struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> 1666{ 1667 using type _LIBCPP_NODEBUG = typename __tuple_cat_type< 1668 tuple<_Types...>, 1669 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type 1670 >::type; 1671}; 1672 1673template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples> 1674struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1675 : public __tuple_cat_return_1< 1676 typename __tuple_cat_type< 1677 tuple<_Types...>, 1678 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type 1679 >::type, 1680 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value, 1681 _Tuple1, _Tuples...> 1682{ 1683}; 1684 1685template <class ..._Tuples> struct __tuple_cat_return; 1686 1687template <class _Tuple0, class ..._Tuples> 1688struct __tuple_cat_return<_Tuple0, _Tuples...> 1689 : public __tuple_cat_return_1<tuple<>, 1690 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value, _Tuple0, 1691 _Tuples...> 1692{ 1693}; 1694 1695template <> 1696struct __tuple_cat_return<> 1697{ 1698 typedef _LIBCPP_NODEBUG tuple<> type; 1699}; 1700 1701inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1702tuple<> 1703tuple_cat() 1704{ 1705 return tuple<>(); 1706} 1707 1708template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples> 1709struct __tuple_cat_return_ref_imp; 1710 1711template <class ..._Types, size_t ..._I0, class _Tuple0> 1712struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> 1713{ 1714 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1715 typedef tuple<_Types..., typename __apply_cv<_Tuple0, 1716 typename tuple_element<_I0, _T0>::type>::type&&...> type; 1717}; 1718 1719template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples> 1720struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, 1721 _Tuple0, _Tuple1, _Tuples...> 1722 : public __tuple_cat_return_ref_imp< 1723 tuple<_Types..., typename __apply_cv<_Tuple0, 1724 typename tuple_element<_I0, 1725 __libcpp_remove_reference_t<_Tuple0> >::type>::type&&...>, 1726 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type, 1727 _Tuple1, _Tuples...> 1728{ 1729}; 1730 1731template <class _Tuple0, class ..._Tuples> 1732struct __tuple_cat_return_ref 1733 : public __tuple_cat_return_ref_imp<tuple<>, 1734 typename __make_tuple_indices< 1735 tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value 1736 >::type, _Tuple0, _Tuples...> 1737{ 1738}; 1739 1740template <class _Types, class _I0, class _J0> 1741struct __tuple_cat; 1742 1743template <class ..._Types, size_t ..._I0, size_t ..._J0> 1744struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > 1745{ 1746 template <class _Tuple0> 1747 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1748 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1749 operator()(tuple<_Types...> __t, _Tuple0&& __t0) 1750 { 1751 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1752 return _VSTD::forward_as_tuple( 1753 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1754 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...); 1755 } 1756 1757 template <class _Tuple0, class _Tuple1, class ..._Tuples> 1758 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1759 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1760 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls) 1761 { 1762 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1763 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1764 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple1> _T1; 1765 return __tuple_cat< 1766 tuple<_Types..., 1767 typename __apply_cv<_Tuple0, typename tuple_element< 1768 _J0, _T0>::type>::type&&...>, 1769 typename __make_tuple_indices<sizeof...(_Types) + 1770 tuple_size<_T0>::value>::type, 1771 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1772 _VSTD::forward_as_tuple( 1773 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1774 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...), 1775 _VSTD::forward<_Tuple1>(__t1), _VSTD::forward<_Tuples>(__tpls)...); 1776 } 1777}; 1778 1779template <class _Tuple0, class... _Tuples> 1780inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 1781typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1782tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) 1783{ 1784 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1785 return __tuple_cat<tuple<>, __tuple_indices<>, 1786 typename __make_tuple_indices<tuple_size<_T0>::value>::type>() 1787 (tuple<>(), _VSTD::forward<_Tuple0>(__t0), 1788 _VSTD::forward<_Tuples>(__tpls)...); 1789} 1790 1791template <class ..._Tp, class _Alloc> 1792struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> 1793 : true_type {}; 1794 1795template <class _T1, class _T2> 1796template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2> 1797inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 1798pair<_T1, _T2>::pair(piecewise_construct_t, 1799 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 1800 __tuple_indices<_I1...>, __tuple_indices<_I2...>) 1801 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...), 1802 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...) 1803{ 1804} 1805 1806#if _LIBCPP_STD_VER > 14 1807template <class _Tp> 1808inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 1809 1810#define _LIBCPP_NOEXCEPT_RETURN(...) noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1811 1812template <class _Fn, class _Tuple, size_t ..._Id> 1813inline _LIBCPP_INLINE_VISIBILITY 1814constexpr decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, 1815 __tuple_indices<_Id...>) 1816_LIBCPP_NOEXCEPT_RETURN( 1817 _VSTD::__invoke( 1818 _VSTD::forward<_Fn>(__f), 1819 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...) 1820) 1821 1822template <class _Fn, class _Tuple> 1823inline _LIBCPP_INLINE_VISIBILITY 1824constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t) 1825_LIBCPP_NOEXCEPT_RETURN( 1826 _VSTD::__apply_tuple_impl( 1827 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), 1828 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1829) 1830 1831template <class _Tp, class _Tuple, size_t... _Idx> 1832inline _LIBCPP_INLINE_VISIBILITY 1833constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1834_LIBCPP_NOEXCEPT_RETURN( 1835 _Tp(_VSTD::get<_Idx>(_VSTD::forward<_Tuple>(__t))...) 1836) 1837 1838template <class _Tp, class _Tuple> 1839inline _LIBCPP_INLINE_VISIBILITY 1840constexpr _Tp make_from_tuple(_Tuple&& __t) 1841_LIBCPP_NOEXCEPT_RETURN( 1842 _VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t), 1843 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1844) 1845 1846#undef _LIBCPP_NOEXCEPT_RETURN 1847 1848#endif // _LIBCPP_STD_VER > 14 1849 1850#endif // !defined(_LIBCPP_CXX03_LANG) 1851 1852_LIBCPP_END_NAMESPACE_STD 1853 1854#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1855# include <exception> 1856# include <iosfwd> 1857# include <new> 1858# include <type_traits> 1859# include <typeinfo> 1860# include <utility> 1861#endif 1862 1863#endif // _LIBCPP_TUPLE 1864