1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TUPLE 11#define _LIBCPP_TUPLE 12 13// clang-format off 14 15/* 16 tuple synopsis 17 18namespace std 19{ 20 21template <class... T> 22class tuple { 23public: 24 explicit(see-below) constexpr tuple(); 25 explicit(see-below) tuple(const T&...); // constexpr in C++14 26 template <class... U> 27 explicit(see-below) tuple(U&&...); // constexpr in C++14 28 tuple(const tuple&) = default; 29 tuple(tuple&&) = default; 30 31 template<class... UTypes> 32 constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23 33 template <class... U> 34 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14 35 template <class... U> 36 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14 37 template<class... UTypes> 38 constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23 39 40 template<class U1, class U2> 41 constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23 42 template <class U1, class U2> 43 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14 44 template <class U1, class U2> 45 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14 46 template<class U1, class U2> 47 constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23 48 49 // allocator-extended constructors 50 template <class Alloc> 51 tuple(allocator_arg_t, const Alloc& a); 52 template <class Alloc> 53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20 54 template <class Alloc, class... U> 55 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20 56 template <class Alloc> 57 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20 58 template <class Alloc> 59 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20 60 template<class Alloc, class... UTypes> 61 constexpr explicit(see-below) 62 tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23 63 template <class Alloc, class... U> 64 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20 65 template <class Alloc, class... U> 66 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20 67 template<class Alloc, class... UTypes> 68 constexpr explicit(see-below) 69 tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23 70 template<class Alloc, class U1, class U2> 71 constexpr explicit(see-below) 72 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23 73 template <class Alloc, class U1, class U2> 74 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20 75 template <class Alloc, class U1, class U2> 76 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20 77 template<class Alloc, class U1, class U2> 78 constexpr explicit(see-below) 79 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23 80 81 tuple& operator=(const tuple&); // constexpr in C++20 82 constexpr const tuple& operator=(const tuple&) const; // C++23 83 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20 84 constexpr const tuple& operator=(tuple&&) const; // C++23 85 template <class... U> 86 tuple& operator=(const tuple<U...>&); // constexpr in C++20 87 template<class... UTypes> 88 constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23 89 template <class... U> 90 tuple& operator=(tuple<U...>&&); // constexpr in C++20 91 template<class... UTypes> 92 constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23 93 template <class U1, class U2> 94 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20 95 template<class U1, class U2> 96 constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23 97 template <class U1, class U2> 98 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20 99 template<class U1, class U2> 100 constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23 101 102 template<class U, size_t N> 103 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION 104 template<class U, size_t N> 105 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION 106 107 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20 108 constexpr void swap(const tuple&) const noexcept(see-below); // C++23 109}; 110 111 112template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23 113 requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; } 114struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> { 115 using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; 116}; 117 118template<class... TTypes, class... UTypes> // since C++23 119 requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; } 120struct common_type<tuple<TTypes...>, tuple<UTypes...>> { 121 using type = tuple<common_type_t<TTypes, UTypes>...>; 122}; 123 124template <class ...T> 125tuple(T...) -> tuple<T...>; // since C++17 126template <class T1, class T2> 127tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17 128template <class Alloc, class ...T> 129tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17 130template <class Alloc, class T1, class T2> 131tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17 132template <class Alloc, class ...T> 133tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17 134 135struct ignore-type { // exposition only // Since C++26 136 constexpr const ignore-type& 137 operator=(const auto &) const noexcept 138 { return *this; } 139}; 140inline constexpr ignore-type ignore; 141 142template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 143template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 144template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 145template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 146 147// [tuple.apply], calling a function with a tuple of arguments: 148template <class F, class Tuple> 149 constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23 150template <class T, class Tuple> 151 constexpr T make_from_tuple(Tuple&& t); // C++17 152 153// 20.4.1.4, tuple helper classes: 154template <class T> struct tuple_size; // undefined 155template <class... T> struct tuple_size<tuple<T...>>; 156template <class T> 157 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 158template <size_t I, class T> struct tuple_element; // undefined 159template <size_t I, class... T> struct tuple_element<I, tuple<T...>>; 160template <size_t I, class T> 161 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 162 163// 20.4.1.5, element access: 164template <size_t I, class... T> 165 typename tuple_element<I, tuple<T...>>::type& 166 get(tuple<T...>&) noexcept; // constexpr in C++14 167template <size_t I, class... T> 168 const typename tuple_element<I, tuple<T...>>::type& 169 get(const tuple<T...>&) noexcept; // constexpr in C++14 170template <size_t I, class... T> 171 typename tuple_element<I, tuple<T...>>::type&& 172 get(tuple<T...>&&) noexcept; // constexpr in C++14 173template <size_t I, class... T> 174 const typename tuple_element<I, tuple<T...>>::type&& 175 get(const tuple<T...>&&) noexcept; // constexpr in C++14 176 177template <class T1, class... T> 178 constexpr T1& get(tuple<T...>&) noexcept; // C++14 179template <class T1, class... T> 180 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 181template <class T1, class... T> 182 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 183template <class T1, class... T> 184 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 185 186// 20.4.1.6, relational operators: 187template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 188template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 189template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 190template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 191template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 192template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 193template<class... T, class... U> 194 constexpr common_comparison_category_t<synth-three-way-result<T, U>...> 195 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20 196 197template <class... Types, class Alloc> 198 struct uses_allocator<tuple<Types...>, Alloc>; 199 200template <class... Types> 201 void 202 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 203 204template <class... Types> 205 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23 206 207} // std 208 209*/ 210 211// clang-format on 212 213#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 214# include <__cxx03/tuple> 215#else 216# include <__compare/common_comparison_category.h> 217# include <__compare/ordering.h> 218# include <__compare/synth_three_way.h> 219# include <__config> 220# include <__cstddef/size_t.h> 221# include <__fwd/array.h> 222# include <__fwd/pair.h> 223# include <__fwd/tuple.h> 224# include <__memory/allocator_arg_t.h> 225# include <__memory/uses_allocator.h> 226# include <__tuple/find_index.h> 227# include <__tuple/ignore.h> 228# include <__tuple/make_tuple_types.h> 229# include <__tuple/sfinae_helpers.h> 230# include <__tuple/tuple_element.h> 231# include <__tuple/tuple_indices.h> 232# include <__tuple/tuple_like_ext.h> 233# include <__tuple/tuple_size.h> 234# include <__tuple/tuple_types.h> 235# include <__type_traits/common_reference.h> 236# include <__type_traits/common_type.h> 237# include <__type_traits/conditional.h> 238# include <__type_traits/conjunction.h> 239# include <__type_traits/copy_cvref.h> 240# include <__type_traits/disjunction.h> 241# include <__type_traits/enable_if.h> 242# include <__type_traits/invoke.h> 243# include <__type_traits/is_arithmetic.h> 244# include <__type_traits/is_assignable.h> 245# include <__type_traits/is_constructible.h> 246# include <__type_traits/is_convertible.h> 247# include <__type_traits/is_empty.h> 248# include <__type_traits/is_final.h> 249# include <__type_traits/is_implicitly_default_constructible.h> 250# include <__type_traits/is_nothrow_assignable.h> 251# include <__type_traits/is_nothrow_constructible.h> 252# include <__type_traits/is_reference.h> 253# include <__type_traits/is_same.h> 254# include <__type_traits/is_swappable.h> 255# include <__type_traits/is_trivially_relocatable.h> 256# include <__type_traits/lazy.h> 257# include <__type_traits/maybe_const.h> 258# include <__type_traits/nat.h> 259# include <__type_traits/negation.h> 260# include <__type_traits/remove_cv.h> 261# include <__type_traits/remove_cvref.h> 262# include <__type_traits/remove_reference.h> 263# include <__type_traits/unwrap_ref.h> 264# include <__utility/declval.h> 265# include <__utility/forward.h> 266# include <__utility/integer_sequence.h> 267# include <__utility/move.h> 268# include <__utility/piecewise_construct.h> 269# include <__utility/swap.h> 270# include <version> 271 272// standard-mandated includes 273 274// [tuple.syn] 275# include <compare> 276 277# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 278# pragma GCC system_header 279# endif 280 281_LIBCPP_PUSH_MACROS 282# include <__undef_macros> 283 284_LIBCPP_BEGIN_NAMESPACE_STD 285 286# ifndef _LIBCPP_CXX03_LANG 287 288// __tuple_leaf 289 290template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value > 291class __tuple_leaf; 292 293template <size_t _Ip, class _Hp, bool _Ep> 294inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 295swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<_Hp>) { 296 swap(__x.get(), __y.get()); 297} 298 299template <size_t _Ip, class _Hp, bool _Ep> 300_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 301swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, 302 const __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<const _Hp>) { 303 swap(__x.get(), __y.get()); 304} 305 306template <size_t _Ip, class _Hp, bool> 307class __tuple_leaf { 308 _Hp __value_; 309 310 template <class _Tp> 311 static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() { 312# if __has_keyword(__reference_binds_to_temporary) 313 return !__reference_binds_to_temporary(_Hp, _Tp); 314# else 315 return true; 316# endif 317 } 318 319public: 320 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 321 322 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) : __value_() { 323 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 324 } 325 326 template <class _Alloc> 327 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() { 328 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 329 } 330 331 template <class _Alloc> 332 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 333 : __value_(allocator_arg_t(), __a) { 334 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 335 } 336 337 template <class _Alloc> 338 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) { 339 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 340 } 341 342 template < 343 class _Tp, 344 __enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, int> = 0> 345 _LIBCPP_HIDE_FROM_ABI 346 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value) 347 : __value_(std::forward<_Tp>(__t)) { 348 static_assert(__can_bind_reference<_Tp&&>(), 349 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 350 } 351 352 template <class _Tp, class _Alloc> 353 _LIBCPP_HIDE_FROM_ABI 354 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 355 : __value_(std::forward<_Tp>(__t)) { 356 static_assert(__can_bind_reference<_Tp&&>(), 357 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 358 } 359 360 template <class _Tp, class _Alloc> 361 _LIBCPP_HIDE_FROM_ABI 362 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 363 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) { 364 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 365 } 366 367 template <class _Tp, class _Alloc> 368 _LIBCPP_HIDE_FROM_ABI 369 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 370 : __value_(std::forward<_Tp>(__t), __a) { 371 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 372 } 373 374 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default; 375 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default; 376 377 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int 378 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) { 379 std::swap(*this, __t); 380 return 0; 381 } 382 383 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const 384 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) { 385 std::swap(*this, __t); 386 return 0; 387 } 388 389 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; } 390 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; } 391}; 392 393template <size_t _Ip, class _Hp> 394class __tuple_leaf<_Ip, _Hp, true> : private __remove_cv_t<_Hp> { 395public: 396 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 397 398 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) {} 399 400 template <class _Alloc> 401 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 402 403 template <class _Alloc> 404 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 405 : _Hp(allocator_arg_t(), __a) {} 406 407 template <class _Alloc> 408 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {} 409 410 template <class _Tp, 411 __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, 412 int> = 0> 413 _LIBCPP_HIDE_FROM_ABI 414 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value) 415 : _Hp(std::forward<_Tp>(__t)) {} 416 417 template <class _Tp, class _Alloc> 418 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 419 : _Hp(std::forward<_Tp>(__t)) {} 420 421 template <class _Tp, class _Alloc> 422 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 423 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {} 424 425 template <class _Tp, class _Alloc> 426 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 427 : _Hp(std::forward<_Tp>(__t), __a) {} 428 429 __tuple_leaf(__tuple_leaf const&) = default; 430 __tuple_leaf(__tuple_leaf&&) = default; 431 432 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int 433 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) { 434 std::swap(*this, __t); 435 return 0; 436 } 437 438 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const 439 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) { 440 std::swap(*this, __rhs); 441 return 0; 442 } 443 444 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); } 445 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { 446 return static_cast<const _Hp&>(*this); 447 } 448}; 449 450template <class... _Tp> 451_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {} 452 453template <class _Tp> 454struct __all_default_constructible; 455 456template <class... _Tp> 457struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {}; 458 459// __tuple_impl 460 461template <class _Indx, class... _Tp> 462struct __tuple_impl; 463 464template <size_t... _Indx, class... _Tp> 465struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 466 : public __tuple_leaf<_Indx, _Tp>... { 467 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept( 468 __all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 469 470 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 471 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 472 __tuple_indices<_Uf...>, 473 __tuple_types<_Tf...>, 474 __tuple_indices<_Ul...>, 475 __tuple_types<_Tl...>, 476 _Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 477 __all<is_nothrow_default_constructible<_Tl>::value...>::value) 478 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {} 479 480 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 481 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 482 allocator_arg_t, 483 const _Alloc& __a, 484 __tuple_indices<_Uf...>, 485 __tuple_types<_Tf...>, 486 __tuple_indices<_Ul...>, 487 __tuple_types<_Tl...>, 488 _Up&&... __u) 489 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))..., 490 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {} 491 492 template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 493 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) noexcept( 494 (__all<is_nothrow_constructible< 495 _Tp, 496 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 497 : __tuple_leaf<_Indx, _Tp>( 498 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 499 std::get<_Indx>(__t)))... {} 500 501 template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 502 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 503 : __tuple_leaf<_Indx, _Tp>( 504 __uses_alloc_ctor<_Tp, 505 _Alloc, 506 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(), 507 __a, 508 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 509 std::get<_Indx>(__t)))... {} 510 511 __tuple_impl(const __tuple_impl&) = default; 512 __tuple_impl(__tuple_impl&&) = default; 513 514 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 515 swap(__tuple_impl& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 516 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 517 } 518 519 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const 520 noexcept(__all<__is_nothrow_swappable_v<const _Tp>...>::value) { 521 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 522 } 523}; 524 525template <class _Dest, class _Source, size_t... _Np> 526_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 527__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 528 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...); 529} 530 531template <class _Dest, class _Source, class... _Up, size_t... _Np> 532_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 533__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 534 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...); 535} 536 537template <class... _Tp> 538class _LIBCPP_TEMPLATE_VIS tuple { 539 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 540 541 _BaseT __base_; 542 543 template <size_t _Jp, class... _Up> 544 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 545 template <size_t _Jp, class... _Up> 546 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type& 547 get(const tuple<_Up...>&) _NOEXCEPT; 548 template <size_t _Jp, class... _Up> 549 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&& 550 get(tuple<_Up...>&&) _NOEXCEPT; 551 template <size_t _Jp, class... _Up> 552 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&& 553 get(const tuple<_Up...>&&) _NOEXCEPT; 554 555public: 556 using __trivially_relocatable _LIBCPP_NODEBUG = 557 __conditional_t<_And<__libcpp_is_trivially_relocatable<_Tp>...>::value, tuple, void>; 558 559 // [tuple.cnstr] 560 561 // tuple() constructors (including allocator_arg_t variants) 562 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 563 template <class...> class _IsDefault = is_default_constructible, 564 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 565 _LIBCPP_HIDE_FROM_ABI constexpr explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 566 tuple() noexcept(_And<is_nothrow_default_constructible<_Tp>...>::value) {} 567 568 template <class _Alloc, 569 template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 570 template <class...> class _IsDefault = is_default_constructible, 571 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 572 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 573 tuple(allocator_arg_t, _Alloc const& __a) 574 : __base_(allocator_arg_t(), 575 __a, 576 __tuple_indices<>(), 577 __tuple_types<>(), 578 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 579 __tuple_types<_Tp...>()) {} 580 581 // tuple(const T&...) constructors (including allocator_arg_t variants) 582 template <template <class...> class _And = _And, 583 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 584 _LIBCPP_HIDE_FROM_ABI 585 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 586 tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value) 587 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 588 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 589 typename __make_tuple_indices<0>::type(), 590 typename __make_tuple_types<tuple, 0>::type(), 591 __t...) {} 592 593 template <class _Alloc, 594 template <class...> class _And = _And, 595 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 596 _LIBCPP_HIDE_FROM_ABI 597 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 598 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t) 599 : __base_(allocator_arg_t(), 600 __a, 601 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 602 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 603 typename __make_tuple_indices<0>::type(), 604 typename __make_tuple_types<tuple, 0>::type(), 605 __t...) {} 606 607 // tuple(U&& ...) constructors (including allocator_arg_t variants) 608 template <class... _Up> 609 struct _IsThisTuple : false_type {}; 610 template <class _Up> 611 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {}; 612 613 template <class... _Up> 614 struct _EnableUTypesCtor 615 : _And< _BoolConstant<sizeof...(_Tp) >= 1>, 616 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 617 is_constructible<_Tp, _Up>... > {}; 618 619 template <class... _Up, 620 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 621 int> = 0> 622 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 623 tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 624 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 625 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 626 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 627 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 628 std::forward<_Up>(__u)...) {} 629 630 template <class _Alloc, 631 class... _Up, 632 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 633 int> = 0> 634 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 635 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 636 : __base_(allocator_arg_t(), 637 __a, 638 typename __make_tuple_indices<sizeof...(_Up)>::type(), 639 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 640 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 641 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 642 std::forward<_Up>(__u)...) {} 643 644 // Copy and move constructors (including the allocator_arg_t variants) 645 tuple(const tuple&) = default; 646 tuple(tuple&&) = default; 647 648 template <class _Alloc, 649 template <class...> class _And = _And, 650 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0> 651 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 652 : __base_(allocator_arg_t(), __alloc, __t) {} 653 654 template <class _Alloc, 655 template <class...> class _And = _And, 656 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0> 657 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 658 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 659 660 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 661 662 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void> 663 struct _EnableCtorFromUTypesTuple : false_type {}; 664 665 template <class _OtherTuple, class... _Up> 666 struct _EnableCtorFromUTypesTuple< 667 _OtherTuple, 668 tuple<_Up...>, 669 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 670 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> 671 : _And< 672 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor 673 // can work. Otherwise, is_constructible can trigger hard error in those cases 674 // https://godbolt.org/z/M94cGdKcE 675 _Not<is_same<_OtherTuple, const tuple&> >, 676 _Not<is_same<_OtherTuple, tuple&&> >, 677 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 678 _Lazy<_Or, 679 _BoolConstant<sizeof...(_Tp) != 1>, 680 // _Tp and _Up are 1-element packs - the pack expansions look 681 // weird to avoid tripping up the type traits in degenerate cases 682 _Lazy<_And, 683 _Not<is_same<_Tp, _Up> >..., 684 _Not<is_convertible<_OtherTuple, _Tp> >..., 685 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {}; 686 687 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 688 _LIBCPP_HIDE_FROM_ABI 689 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 690 tuple(const tuple<_Up...>& __t) noexcept(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value) 691 : __base_(__t) {} 692 693 template <class... _Up, 694 class _Alloc, 695 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 696 _LIBCPP_HIDE_FROM_ABI 697 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 698 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 699 : __base_(allocator_arg_t(), __a, __t) {} 700 701# if _LIBCPP_STD_VER >= 23 702 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 703 704 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 705 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t) 706 : __base_(__t) {} 707 708 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 709 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) 710 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) 711 : __base_(allocator_arg_t(), __alloc, __t) {} 712# endif // _LIBCPP_STD_VER >= 23 713 714 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 715 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 716 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 717 tuple(tuple<_Up...>&& __t) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 718 : __base_(std::move(__t)) {} 719 720 template <class _Alloc, 721 class... _Up, 722 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 723 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 724 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 725 : __base_(allocator_arg_t(), __a, std::move(__t)) {} 726 727# if _LIBCPP_STD_VER >= 23 728 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 729 730 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 731 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 732 tuple(const tuple<_Up...>&& __t) 733 : __base_(std::move(__t)) {} 734 735 template <class _Alloc, 736 class... _Up, 737 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 738 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 739 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 740 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 741# endif // _LIBCPP_STD_VER >= 23 742 743 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 744 745 template <template <class...> class _Pred, 746 class _Pair, 747 class _DecayedPair = __remove_cvref_t<_Pair>, 748 class _Tuple = tuple> 749 struct _CtorPredicateFromPair : false_type {}; 750 751 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 752 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 753 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {}; 754 755 template <class _Pair> 756 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {}; 757 758 template <class _Pair> 759 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {}; 760 761 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 762 struct _BothImplicitlyConvertible : false_type {}; 763 764 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 765 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 766 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {}; 767 768 template <class _Up1, 769 class _Up2, 770 template <class...> class _And = _And, 771 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 772 _LIBCPP_HIDE_FROM_ABI 773 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 774 tuple(const pair<_Up1, _Up2>& __p) noexcept(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value) 775 : __base_(__p) {} 776 777 template <class _Alloc, 778 class _Up1, 779 class _Up2, 780 template <class...> class _And = _And, 781 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 782 _LIBCPP_HIDE_FROM_ABI 783 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 784 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 785 : __base_(allocator_arg_t(), __a, __p) {} 786 787# if _LIBCPP_STD_VER >= 23 788 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 789 790 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 791 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 792 tuple(pair<_U1, _U2>& __p) 793 : __base_(__p) {} 794 795 template <class _Alloc, 796 class _U1, 797 class _U2, 798 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 799 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 800 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) 801 : __base_(allocator_arg_t(), __alloc, __p) {} 802# endif 803 804 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 805 806 template <class _Up1, 807 class _Up2, 808 template <class...> class _And = _And, 809 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 810 _LIBCPP_HIDE_FROM_ABI 811 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 812 tuple(pair<_Up1, _Up2>&& __p) noexcept(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value) 813 : __base_(std::move(__p)) {} 814 815 template <class _Alloc, 816 class _Up1, 817 class _Up2, 818 template <class...> class _And = _And, 819 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 820 _LIBCPP_HIDE_FROM_ABI 821 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 822 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 823 : __base_(allocator_arg_t(), __a, std::move(__p)) {} 824 825# if _LIBCPP_STD_VER >= 23 826 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 827 828 template <class _U1, class _U2, 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(const pair<_U1, _U2>&& __p) 831 : __base_(std::move(__p)) {} 832 833 template <class _Alloc, 834 class _U1, 835 class _U2, 836 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 837 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 838 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 839 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 840# endif // _LIBCPP_STD_VER >= 23 841 842 // [tuple.assign] 843 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 844 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) noexcept( 845 _And<is_nothrow_copy_assignable<_Tp>...>::value) { 846 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 847 return *this; 848 } 849 850# if _LIBCPP_STD_VER >= 23 851 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const 852 requires(_And<is_copy_assignable<const _Tp>...>::value) 853 { 854 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 855 return *this; 856 } 857 858 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const 859 requires(_And<is_assignable<const _Tp&, _Tp>...>::value) 860 { 861 std::__memberwise_forward_assign( 862 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 863 return *this; 864 } 865# endif // _LIBCPP_STD_VER >= 23 866 867 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 868 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) noexcept( 869 _And<is_nothrow_move_assignable<_Tp>...>::value) { 870 std::__memberwise_forward_assign( 871 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 872 return *this; 873 } 874 875 template < 876 class... _Up, 877 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value, 878 int> = 0> 879 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 880 operator=(tuple<_Up...> const& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 881 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 882 return *this; 883 } 884 885 template <class... _Up, 886 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value, 887 int> = 0> 888 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 889 operator=(tuple<_Up...>&& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 890 std::__memberwise_forward_assign( 891 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 892 return *this; 893 } 894 895# if _LIBCPP_STD_VER >= 23 896 template <class... _UTypes, 897 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 898 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 899 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const { 900 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 901 return *this; 902 } 903 904 template <class... _UTypes, 905 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 906 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 907 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const { 908 std::__memberwise_forward_assign( 909 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 910 return *this; 911 } 912# endif // _LIBCPP_STD_VER >= 23 913 914 template <template <class...> class _Pred, 915 bool _Const, 916 class _Pair, 917 class _DecayedPair = __remove_cvref_t<_Pair>, 918 class _Tuple = tuple> 919 struct _AssignPredicateFromPair : false_type {}; 920 921 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 922 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 923 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 924 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {}; 925 926 template <bool _Const, class _Pair> 927 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 928 929 template <bool _Const, class _Pair> 930 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 931 932# if _LIBCPP_STD_VER >= 23 933 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 934 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const 935 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 936 std::get<0>(*this) = __pair.first; 937 std::get<1>(*this) = __pair.second; 938 return *this; 939 } 940 941 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 942 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const 943 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 944 std::get<0>(*this) = std::move(__pair.first); 945 std::get<1>(*this) = std::move(__pair.second); 946 return *this; 947 } 948# endif // _LIBCPP_STD_VER >= 23 949 950 template <class _Up1, 951 class _Up2, 952 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0> 953 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 954 operator=(pair<_Up1, _Up2> const& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) { 955 std::get<0>(*this) = __pair.first; 956 std::get<1>(*this) = __pair.second; 957 return *this; 958 } 959 960 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0> 961 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 962 operator=(pair<_Up1, _Up2>&& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) { 963 std::get<0>(*this) = std::forward<_Up1>(__pair.first); 964 std::get<1>(*this) = std::forward<_Up2>(__pair.second); 965 return *this; 966 } 967 968 // EXTENSION 969 template < 970 class _Up, 971 size_t _Np, 972 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0> 973 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 974 operator=(array<_Up, _Np> const& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 975 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 976 return *this; 977 } 978 979 // EXTENSION 980 template <class _Up, 981 size_t _Np, 982 class = void, 983 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0> 984 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 985 operator=(array<_Up, _Np>&& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 986 std::__memberwise_forward_assign( 987 *this, 988 std::move(__array), 989 __tuple_types<_If<true, _Up, _Tp>...>(), 990 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 991 return *this; 992 } 993 994 // [tuple.swap] 995 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 996 swap(tuple& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 997 __base_.swap(__t.__base_); 998 } 999 1000# if _LIBCPP_STD_VER >= 23 1001 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const 1002 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 1003 __base_.swap(__t.__base_); 1004 } 1005# endif // _LIBCPP_STD_VER >= 23 1006}; 1007 1008template <> 1009class _LIBCPP_TEMPLATE_VIS tuple<> { 1010public: 1011 constexpr tuple() _NOEXCEPT = default; 1012 template <class _Alloc> 1013 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1014 template <class _Alloc> 1015 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1016 template <class _Up> 1017 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {} 1018 template <class _Alloc, class _Up> 1019 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1020 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {} 1021# if _LIBCPP_STD_VER >= 23 1022 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1023# endif 1024}; 1025 1026# if _LIBCPP_STD_VER >= 23 1027template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual> 1028 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1029struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1030 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1031}; 1032 1033template <class... _TTypes, class... _UTypes> 1034 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1035struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1036 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1037}; 1038# endif // _LIBCPP_STD_VER >= 23 1039 1040# if _LIBCPP_STD_VER >= 17 1041template <class... _Tp> 1042tuple(_Tp...) -> tuple<_Tp...>; 1043template <class _Tp1, class _Tp2> 1044tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1045template <class _Alloc, class... _Tp> 1046tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1047template <class _Alloc, class _Tp1, class _Tp2> 1048tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1049template <class _Alloc, class... _Tp> 1050tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1051# endif 1052 1053template <class... _Tp, __enable_if_t<__all<__is_swappable_v<_Tp>...>::value, int> = 0> 1054inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 1055swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 1056 __t.swap(__u); 1057} 1058 1059# if _LIBCPP_STD_VER >= 23 1060template <class... _Tp> 1061_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1062swap(const tuple<_Tp...>& __lhs, 1063 const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1064 __lhs.swap(__rhs); 1065} 1066# endif 1067 1068// get 1069 1070template <size_t _Ip, class... _Tp> 1071inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type& 1072get(tuple<_Tp...>& __t) _NOEXCEPT { 1073 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; 1074 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1075} 1076 1077template <size_t _Ip, class... _Tp> 1078inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1079get(const tuple<_Tp...>& __t) _NOEXCEPT { 1080 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; 1081 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1082} 1083 1084template <size_t _Ip, class... _Tp> 1085inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1086get(tuple<_Tp...>&& __t) _NOEXCEPT { 1087 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; 1088 return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1089} 1090 1091template <size_t _Ip, class... _Tp> 1092inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1093get(const tuple<_Tp...>&& __t) _NOEXCEPT { 1094 using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; 1095 return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1096} 1097 1098# if _LIBCPP_STD_VER >= 14 1099 1100template <class _T1, class... _Args> 1101inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept { 1102 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1103} 1104 1105template <class _T1, class... _Args> 1106inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept { 1107 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1108} 1109 1110template <class _T1, class... _Args> 1111inline _LIBCPP_HIDE_FROM_ABI constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept { 1112 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1113} 1114 1115template <class _T1, class... _Args> 1116inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept { 1117 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1118} 1119 1120# endif 1121 1122// tie 1123 1124template <class... _Tp> 1125inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT { 1126 return tuple<_Tp&...>(__t...); 1127} 1128 1129template <class... _Tp> 1130inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<__unwrap_ref_decay_t<_Tp>...> 1131make_tuple(_Tp&&... __t) { 1132 return tuple<__unwrap_ref_decay_t<_Tp>...>(std::forward<_Tp>(__t)...); 1133} 1134 1135template <class... _Tp> 1136inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT { 1137 return tuple<_Tp&&...>(std::forward<_Tp>(__t)...); 1138} 1139 1140template <size_t _Ip> 1141struct __tuple_equal { 1142 template <class _Tp, class _Up> 1143 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1144 return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y); 1145 } 1146}; 1147 1148template <> 1149struct __tuple_equal<0> { 1150 template <class _Tp, class _Up> 1151 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1152 return true; 1153 } 1154}; 1155 1156template <class... _Tp, class... _Up> 1157inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1158operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1159 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1160 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1161} 1162 1163# if _LIBCPP_STD_VER >= 20 1164 1165// operator<=> 1166 1167template <class... _Tp, class... _Up, size_t... _Is> 1168_LIBCPP_HIDE_FROM_ABI constexpr auto 1169__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1170 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1171 static_cast<void>( 1172 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...)); 1173 return __result; 1174} 1175 1176template <class... _Tp, class... _Up> 1177 requires(sizeof...(_Tp) == sizeof...(_Up)) 1178_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1179operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1180 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1181} 1182 1183# else // _LIBCPP_STD_VER >= 20 1184 1185template <class... _Tp, class... _Up> 1186inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1187operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1188 return !(__x == __y); 1189} 1190 1191template <size_t _Ip> 1192struct __tuple_less { 1193 template <class _Tp, class _Up> 1194 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1195 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1196 if (std::get<__idx>(__x) < std::get<__idx>(__y)) 1197 return true; 1198 if (std::get<__idx>(__y) < std::get<__idx>(__x)) 1199 return false; 1200 return __tuple_less<_Ip - 1>()(__x, __y); 1201 } 1202}; 1203 1204template <> 1205struct __tuple_less<0> { 1206 template <class _Tp, class _Up> 1207 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1208 return false; 1209 } 1210}; 1211 1212template <class... _Tp, class... _Up> 1213inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1214operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1215 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1216 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1217} 1218 1219template <class... _Tp, class... _Up> 1220inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1221operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1222 return __y < __x; 1223} 1224 1225template <class... _Tp, class... _Up> 1226inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1227operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1228 return !(__x < __y); 1229} 1230 1231template <class... _Tp, class... _Up> 1232inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1233operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1234 return !(__y < __x); 1235} 1236 1237# endif // _LIBCPP_STD_VER >= 20 1238 1239// tuple_cat 1240 1241template <class _Tp, class _Up> 1242struct __tuple_cat_type; 1243 1244template <class... _Ttypes, class... _Utypes> 1245struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > { 1246 using type _LIBCPP_NODEBUG = tuple<_Ttypes..., _Utypes...>; 1247}; 1248 1249template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples> 1250struct __tuple_cat_return_1 {}; 1251 1252template <class... _Types, class _Tuple0> 1253struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> { 1254 using type _LIBCPP_NODEBUG = 1255 typename __tuple_cat_type< tuple<_Types...>, 1256 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type; 1257}; 1258 1259template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples> 1260struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1261 : public __tuple_cat_return_1< 1262 typename __tuple_cat_type< tuple<_Types...>, 1263 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type, 1264 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value, 1265 _Tuple1, 1266 _Tuples...> {}; 1267 1268template <class... _Tuples> 1269struct __tuple_cat_return; 1270 1271template <class _Tuple0, class... _Tuples> 1272struct __tuple_cat_return<_Tuple0, _Tuples...> 1273 : public __tuple_cat_return_1<tuple<>, 1274 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value, 1275 _Tuple0, 1276 _Tuples...> {}; 1277 1278template <> 1279struct __tuple_cat_return<> { 1280 using type _LIBCPP_NODEBUG = tuple<>; 1281}; 1282 1283inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); } 1284 1285template <class _Rp, class _Indices, class _Tuple0, class... _Tuples> 1286struct __tuple_cat_return_ref_imp; 1287 1288template <class... _Types, size_t... _I0, class _Tuple0> 1289struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> { 1290 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>; 1291 typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type; 1292}; 1293 1294template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples> 1295struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...> 1296 : public __tuple_cat_return_ref_imp< 1297 tuple<_Types..., 1298 __copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>, 1299 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type, 1300 _Tuple1, 1301 _Tuples...> {}; 1302 1303template <class _Tuple0, class... _Tuples> 1304struct __tuple_cat_return_ref 1305 : public __tuple_cat_return_ref_imp< 1306 tuple<>, 1307 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type, 1308 _Tuple0, 1309 _Tuples...> {}; 1310 1311template <class _Types, class _I0, class _J0> 1312struct __tuple_cat; 1313 1314template <class... _Types, size_t... _I0, size_t... _J0> 1315struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > { 1316 template <class _Tuple0> 1317 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1318 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1319 operator()(tuple<_Types...> __t, _Tuple0&& __t0) { 1320 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1321 return std::forward_as_tuple( 1322 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...); 1323 } 1324 1325 template <class _Tuple0, class _Tuple1, class... _Tuples> 1326 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1327 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1328 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) { 1329 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1330 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>; 1331 using _T1 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple1>; 1332 return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>, 1333 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type, 1334 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1335 std::forward_as_tuple( 1336 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...), 1337 std::forward<_Tuple1>(__t1), 1338 std::forward<_Tuples>(__tpls)...); 1339 } 1340}; 1341 1342template <class _TupleDst, class _TupleSrc, size_t... _Indices> 1343inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _TupleDst 1344__tuple_cat_select_element_wise(_TupleSrc&& __src, __tuple_indices<_Indices...>) { 1345 static_assert(tuple_size<_TupleDst>::value == tuple_size<_TupleSrc>::value, 1346 "misuse of __tuple_cat_select_element_wise with tuples of different sizes"); 1347 return _TupleDst(std::get<_Indices>(std::forward<_TupleSrc>(__src))...); 1348} 1349 1350template <class _Tuple0, class... _Tuples> 1351inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1352tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) { 1353 using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>; 1354 using _TRet _LIBCPP_NODEBUG = typename __tuple_cat_return<_Tuple0, _Tuples...>::type; 1355 using _T0Indices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_T0>::value>::type; 1356 using _TRetIndices _LIBCPP_NODEBUG = typename __make_tuple_indices<tuple_size<_TRet>::value>::type; 1357 return std::__tuple_cat_select_element_wise<_TRet>( 1358 __tuple_cat<tuple<>, __tuple_indices<>, _T0Indices>()( 1359 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...), 1360 _TRetIndices()); 1361} 1362 1363template <class... _Tp, class _Alloc> 1364struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {}; 1365 1366# if _LIBCPP_STD_VER >= 17 1367# define _LIBCPP_NOEXCEPT_RETURN(...) \ 1368 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1369 1370// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting. 1371// clang-format off 1372template <class _Fn, class _Tuple, size_t... _Id> 1373inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) 1374__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>) 1375 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...)) 1376 1377template <class _Fn, class _Tuple> 1378inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t) 1379 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl( 1380 std::forward<_Fn>(__f), 1381 std::forward<_Tuple>(__t), 1382 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1383 1384#if _LIBCPP_STD_VER >= 20 1385template <class _Tp, class _Tuple, size_t... _Idx> 1386inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1387 noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))) 1388 requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> { 1389 return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); 1390} 1391#else 1392template <class _Tp, class _Tuple, size_t... _Idx> 1393inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>, 1394 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr) 1395 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)) 1396#endif // _LIBCPP_STD_VER >= 20 1397 1398template <class _Tp, class _Tuple, 1399 class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void> 1400inline constexpr bool __can_make_from_tuple = false; 1401 1402template <class _Tp, class _Tuple, size_t... _Idx> 1403inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>, 1404 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true; 1405 1406// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9, 1407// the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple 1408// SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl 1409// so that std::__make_from_tuple_impl will have the same advantages when used alone. 1410#if _LIBCPP_STD_VER >= 20 1411template <class _Tp, class _Tuple> 1412 requires __can_make_from_tuple<_Tp, _Tuple> // strengthen 1413#else 1414template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen 1415#endif // _LIBCPP_STD_VER >= 20 1416inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t) 1417 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>( 1418 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1419# undef _LIBCPP_NOEXCEPT_RETURN 1420 1421# endif // _LIBCPP_STD_VER >= 17 1422 1423#endif // !defined(_LIBCPP_CXX03_LANG) 1424 1425_LIBCPP_END_NAMESPACE_STD 1426 1427_LIBCPP_POP_MACROS 1428 1429// clang-format on 1430 1431# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1432# include <cstddef> 1433# include <exception> 1434# include <iosfwd> 1435# include <new> 1436# include <type_traits> 1437# include <typeinfo> 1438# include <utility> 1439# endif 1440#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 1441 1442#endif // _LIBCPP_TUPLE 1443