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 135inline constexpr unspecified ignore; 136 137template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 138template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 139template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 140template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 141 142// [tuple.apply], calling a function with a tuple of arguments: 143template <class F, class Tuple> 144 constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23 145template <class T, class Tuple> 146 constexpr T make_from_tuple(Tuple&& t); // C++17 147 148// 20.4.1.4, tuple helper classes: 149template <class T> struct tuple_size; // undefined 150template <class... T> struct tuple_size<tuple<T...>>; 151template <class T> 152 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 153template <size_t I, class T> struct tuple_element; // undefined 154template <size_t I, class... T> struct tuple_element<I, tuple<T...>>; 155template <size_t I, class T> 156 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 157 158// 20.4.1.5, element access: 159template <size_t I, class... T> 160 typename tuple_element<I, tuple<T...>>::type& 161 get(tuple<T...>&) noexcept; // constexpr in C++14 162template <size_t I, class... T> 163 const typename tuple_element<I, tuple<T...>>::type& 164 get(const tuple<T...>&) noexcept; // constexpr in C++14 165template <size_t I, class... T> 166 typename tuple_element<I, tuple<T...>>::type&& 167 get(tuple<T...>&&) noexcept; // constexpr in C++14 168template <size_t I, class... T> 169 const typename tuple_element<I, tuple<T...>>::type&& 170 get(const tuple<T...>&&) noexcept; // constexpr in C++14 171 172template <class T1, class... T> 173 constexpr T1& get(tuple<T...>&) noexcept; // C++14 174template <class T1, class... T> 175 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 176template <class T1, class... T> 177 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 178template <class T1, class... T> 179 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 180 181// 20.4.1.6, relational operators: 182template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 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> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 187template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 188template<class... T, class... U> 189 constexpr common_comparison_category_t<synth-three-way-result<T, U>...> 190 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20 191 192template <class... Types, class Alloc> 193 struct uses_allocator<tuple<Types...>, Alloc>; 194 195template <class... Types> 196 void 197 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 198 199template <class... Types> 200 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23 201 202} // std 203 204*/ 205 206// clang-format on 207 208#include <__assert> // all public C++ headers provide the assertion handler 209#include <__compare/common_comparison_category.h> 210#include <__compare/synth_three_way.h> 211#include <__config> 212#include <__functional/invoke.h> 213#include <__fwd/array.h> 214#include <__fwd/get.h> 215#include <__fwd/tuple.h> 216#include <__memory/allocator_arg_t.h> 217#include <__memory/uses_allocator.h> 218#include <__tuple/make_tuple_types.h> 219#include <__tuple/sfinae_helpers.h> 220#include <__tuple/tuple_element.h> 221#include <__tuple/tuple_indices.h> 222#include <__tuple/tuple_like_ext.h> 223#include <__tuple/tuple_size.h> 224#include <__tuple/tuple_types.h> 225#include <__type_traits/apply_cv.h> 226#include <__type_traits/common_reference.h> 227#include <__type_traits/common_type.h> 228#include <__type_traits/conditional.h> 229#include <__type_traits/conjunction.h> 230#include <__type_traits/copy_cvref.h> 231#include <__type_traits/disjunction.h> 232#include <__type_traits/is_arithmetic.h> 233#include <__type_traits/is_assignable.h> 234#include <__type_traits/is_constructible.h> 235#include <__type_traits/is_convertible.h> 236#include <__type_traits/is_copy_assignable.h> 237#include <__type_traits/is_copy_constructible.h> 238#include <__type_traits/is_default_constructible.h> 239#include <__type_traits/is_empty.h> 240#include <__type_traits/is_final.h> 241#include <__type_traits/is_implicitly_default_constructible.h> 242#include <__type_traits/is_move_assignable.h> 243#include <__type_traits/is_move_constructible.h> 244#include <__type_traits/is_nothrow_assignable.h> 245#include <__type_traits/is_nothrow_constructible.h> 246#include <__type_traits/is_nothrow_copy_assignable.h> 247#include <__type_traits/is_nothrow_copy_constructible.h> 248#include <__type_traits/is_nothrow_default_constructible.h> 249#include <__type_traits/is_nothrow_move_assignable.h> 250#include <__type_traits/is_reference.h> 251#include <__type_traits/is_same.h> 252#include <__type_traits/is_swappable.h> 253#include <__type_traits/lazy.h> 254#include <__type_traits/maybe_const.h> 255#include <__type_traits/nat.h> 256#include <__type_traits/negation.h> 257#include <__type_traits/remove_cvref.h> 258#include <__type_traits/remove_reference.h> 259#include <__type_traits/unwrap_ref.h> 260#include <__utility/forward.h> 261#include <__utility/integer_sequence.h> 262#include <__utility/move.h> 263#include <__utility/pair.h> 264#include <__utility/piecewise_construct.h> 265#include <__utility/swap.h> 266#include <cstddef> 267#include <version> 268 269// standard-mandated includes 270 271// [tuple.syn] 272#include <compare> 273 274#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 275# pragma GCC system_header 276#endif 277 278_LIBCPP_PUSH_MACROS 279#include <__undef_macros> 280 281_LIBCPP_BEGIN_NAMESPACE_STD 282 283#ifndef _LIBCPP_CXX03_LANG 284 285// __tuple_leaf 286 287template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value > 288class __tuple_leaf; 289 290template <size_t _Ip, class _Hp, bool _Ep> 291inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 292swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 293 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) { 294 swap(__x.get(), __y.get()); 295} 296 297template <size_t _Ip, class _Hp, bool _Ep> 298_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 299swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, const __tuple_leaf<_Ip, _Hp, _Ep>& __y) 300 _NOEXCEPT_(__is_nothrow_swappable<const _Hp>::value) { 301 swap(__x.get(), __y.get()); 302} 303 304template <size_t _Ip, class _Hp, bool> 305class __tuple_leaf { 306 _Hp __value_; 307 308 template <class _Tp> 309 static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() { 310# if __has_keyword(__reference_binds_to_temporary) 311 return !__reference_binds_to_temporary(_Hp, _Tp); 312# else 313 return true; 314# endif 315 } 316 317 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&); 318 319public: 320 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_() { 321 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 322 } 323 324 template <class _Alloc> 325 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() { 326 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 327 } 328 329 template <class _Alloc> 330 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 331 : __value_(allocator_arg_t(), __a) { 332 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 333 } 334 335 template <class _Alloc> 336 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) { 337 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 338 } 339 340 template <class _Tp, 341 class = __enable_if_t< 342 _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value > > 343 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) 344 _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 345 : __value_(std::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 } 349 350 template <class _Tp, class _Alloc> 351 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf( 352 integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 353 : __value_(std::forward<_Tp>(__t)) { 354 static_assert(__can_bind_reference<_Tp&&>(), 355 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 356 } 357 358 template <class _Tp, class _Alloc> 359 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf( 360 integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 361 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) { 362 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 363 } 364 365 template <class _Tp, class _Alloc> 366 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf( 367 integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 368 : __value_(std::forward<_Tp>(__t), __a) { 369 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 370 } 371 372 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default; 373 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default; 374 375 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(__tuple_leaf& __t) 376 _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) { 377 std::swap(*this, __t); 378 return 0; 379 } 380 381 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const 382 _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 383 std::swap(*this, __t); 384 return 0; 385 } 386 387 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; } 388 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; } 389}; 390 391template <size_t _Ip, class _Hp> 392class __tuple_leaf<_Ip, _Hp, true> : private _Hp { 393 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&); 394 395public: 396 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 397 398 template <class _Alloc> 399 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 400 401 template <class _Alloc> 402 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 403 : _Hp(allocator_arg_t(), __a) {} 404 405 template <class _Alloc> 406 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {} 407 408 template <class _Tp, 409 class = __enable_if_t< 410 _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value > > 411 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) 412 _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 413 : _Hp(std::forward<_Tp>(__t)) {} 414 415 template <class _Tp, class _Alloc> 416 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 417 : _Hp(std::forward<_Tp>(__t)) {} 418 419 template <class _Tp, class _Alloc> 420 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 421 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {} 422 423 template <class _Tp, class _Alloc> 424 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 425 : _Hp(std::forward<_Tp>(__t), __a) {} 426 427 __tuple_leaf(__tuple_leaf const&) = default; 428 __tuple_leaf(__tuple_leaf&&) = default; 429 430 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(__tuple_leaf& __t) 431 _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) { 432 std::swap(*this, __t); 433 return 0; 434 } 435 436 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const 437 _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 438 std::swap(*this, __rhs); 439 return 0; 440 } 441 442 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); } 443 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { 444 return static_cast<const _Hp&>(*this); 445 } 446}; 447 448template <class... _Tp> 449_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {} 450 451template <class _Tp> 452struct __all_default_constructible; 453 454template <class... _Tp> 455struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {}; 456 457// __tuple_impl 458 459template <class _Indx, class... _Tp> 460struct __tuple_impl; 461 462template <size_t... _Indx, class... _Tp> 463struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 464 : public __tuple_leaf<_Indx, _Tp>... { 465 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() 466 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 467 468 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 469 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 470 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, __tuple_indices<_Ul...>, __tuple_types<_Tl...>, _Up&&... __u) 471 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 472 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) 473 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {} 474 475 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 476 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 477 allocator_arg_t, 478 const _Alloc& __a, 479 __tuple_indices<_Uf...>, 480 __tuple_types<_Tf...>, 481 __tuple_indices<_Ul...>, 482 __tuple_types<_Tl...>, 483 _Up&&... __u) 484 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))..., 485 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {} 486 487 template <class _Tuple, class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> > 488 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) _NOEXCEPT_( 489 (__all<is_nothrow_constructible< 490 _Tp, 491 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 492 : __tuple_leaf<_Indx, _Tp>( 493 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 494 std::get<_Indx>(__t)))... {} 495 496 template <class _Alloc, class _Tuple, class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> > 497 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 498 : __tuple_leaf<_Indx, _Tp>( 499 __uses_alloc_ctor<_Tp, 500 _Alloc, 501 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(), 502 __a, 503 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 504 std::get<_Indx>(__t)))... {} 505 506 __tuple_impl(const __tuple_impl&) = default; 507 __tuple_impl(__tuple_impl&&) = default; 508 509 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(__tuple_impl& __t) 510 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) { 511 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 512 } 513 514 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const 515 _NOEXCEPT_(__all<__is_nothrow_swappable<const _Tp>::value...>::value) { 516 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 517 } 518}; 519 520template <class _Dest, class _Source, size_t... _Np> 521_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 522__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 523 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...); 524} 525 526template <class _Dest, class _Source, class... _Up, size_t... _Np> 527_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 528__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 529 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...); 530} 531 532template <class... _Tp> 533class _LIBCPP_TEMPLATE_VIS tuple { 534 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 535 536 _BaseT __base_; 537 538 template <size_t _Jp, class... _Up> 539 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 540 template <size_t _Jp, class... _Up> 541 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type& 542 get(const tuple<_Up...>&) _NOEXCEPT; 543 template <size_t _Jp, class... _Up> 544 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&& 545 get(tuple<_Up...>&&) _NOEXCEPT; 546 template <size_t _Jp, class... _Up> 547 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&& 548 get(const tuple<_Up...>&&) _NOEXCEPT; 549 550public: 551 // [tuple.cnstr] 552 553 _LIBCPP_DIAGNOSTIC_PUSH 554 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions") 555 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions") 556 557 // tuple() constructors (including allocator_arg_t variants) 558 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 559 template <class...> class _IsDefault = is_default_constructible, 560 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 561 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) tuple() 562 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) {} 563 564 template <class _Alloc, 565 template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 566 template <class...> class _IsDefault = is_default_constructible, 567 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 568 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 569 tuple(allocator_arg_t, _Alloc const& __a) 570 : __base_(allocator_arg_t(), 571 __a, 572 __tuple_indices<>(), 573 __tuple_types<>(), 574 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 575 __tuple_types<_Tp...>()) {} 576 577 // tuple(const T&...) constructors (including allocator_arg_t variants) 578 template <template <class...> class _And = _And, 579 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 580 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 581 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) tuple(const _Tp&... __t) 582 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 583 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 584 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 585 typename __make_tuple_indices<0>::type(), 586 typename __make_tuple_types<tuple, 0>::type(), 587 __t...) {} 588 589 template <class _Alloc, 590 template <class...> class _And = _And, 591 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 592 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 593 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 594 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t) 595 : __base_(allocator_arg_t(), 596 __a, 597 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 598 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 599 typename __make_tuple_indices<0>::type(), 600 typename __make_tuple_types<tuple, 0>::type(), 601 __t...) {} 602 603 // tuple(U&& ...) constructors (including allocator_arg_t variants) 604 template <class... _Up> 605 struct _IsThisTuple : false_type {}; 606 template <class _Up> 607 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {}; 608 609 template <class... _Up> 610 struct _EnableUTypesCtor 611 : _And< _BoolConstant<sizeof...(_Tp) >= 1>, 612 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 613 is_constructible<_Tp, _Up>... > {}; 614 615 template <class... _Up, 616 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 617 int> = 0> 618 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 619 tuple(_Up&&... __u) _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 620 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 621 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 622 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 623 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 624 std::forward<_Up>(__u)...) {} 625 626 template <class _Alloc, 627 class... _Up, 628 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 629 int> = 0> 630 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 631 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 632 : __base_(allocator_arg_t(), 633 __a, 634 typename __make_tuple_indices<sizeof...(_Up)>::type(), 635 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 636 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 637 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 638 std::forward<_Up>(__u)...) {} 639 640 // Copy and move constructors (including the allocator_arg_t variants) 641 tuple(const tuple&) = default; 642 tuple(tuple&&) = default; 643 644 template <class _Alloc, 645 template <class...> class _And = _And, 646 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0> 647 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 648 : __base_(allocator_arg_t(), __alloc, __t) {} 649 650 template <class _Alloc, 651 template <class...> class _And = _And, 652 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0> 653 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 654 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 655 656 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 657 658 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void> 659 struct _EnableCtorFromUTypesTuple : false_type {}; 660 661 template <class _OtherTuple, class... _Up> 662 struct _EnableCtorFromUTypesTuple< 663 _OtherTuple, 664 tuple<_Up...>, 665 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 666 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> 667 : _And< 668 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor 669 // can work. Otherwise, is_constructible can trigger hard error in those cases 670 // https://godbolt.org/z/M94cGdKcE 671 _Not<is_same<_OtherTuple, const tuple&> >, 672 _Not<is_same<_OtherTuple, tuple&&> >, 673 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 674 _Lazy<_Or, 675 _BoolConstant<sizeof...(_Tp) != 1>, 676 // _Tp and _Up are 1-element packs - the pack expansions look 677 // weird to avoid tripping up the type traits in degenerate cases 678 _Lazy<_And, 679 _Not<is_same<_Tp, _Up> >..., 680 _Not<is_convertible<_OtherTuple, _Tp> >..., 681 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {}; 682 683 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 684 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 685 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) tuple(const tuple<_Up...>& __t) 686 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 687 : __base_(__t) {} 688 689 template <class... _Up, 690 class _Alloc, 691 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 692 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 693 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 694 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 695 : __base_(allocator_arg_t(), __a, __t) {} 696 697# if _LIBCPP_STD_VER >= 23 698 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 699 700 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 701 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t) 702 : __base_(__t) {} 703 704 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 705 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) 706 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) 707 : __base_(allocator_arg_t(), __alloc, __t) {} 708# endif // _LIBCPP_STD_VER >= 23 709 710 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 711 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 712 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 713 tuple(tuple<_Up...>&& __t) _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 714 : __base_(std::move(__t)) {} 715 716 template <class _Alloc, 717 class... _Up, 718 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 719 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 720 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 721 : __base_(allocator_arg_t(), __a, std::move(__t)) {} 722 723# if _LIBCPP_STD_VER >= 23 724 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 725 726 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 727 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 728 tuple(const tuple<_Up...>&& __t) 729 : __base_(std::move(__t)) {} 730 731 template <class _Alloc, 732 class... _Up, 733 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 734 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 735 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 736 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 737# endif // _LIBCPP_STD_VER >= 23 738 739 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 740 741 template <template <class...> class _Pred, 742 class _Pair, 743 class _DecayedPair = __remove_cvref_t<_Pair>, 744 class _Tuple = tuple> 745 struct _CtorPredicateFromPair : false_type {}; 746 747 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 748 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 749 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {}; 750 751 template <class _Pair> 752 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {}; 753 754 template <class _Pair> 755 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {}; 756 757 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 758 struct _BothImplicitlyConvertible : false_type {}; 759 760 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 761 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 762 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {}; 763 764 template <class _Up1, 765 class _Up2, 766 template <class...> class _And = _And, 767 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 768 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 769 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) tuple(const pair<_Up1, _Up2>& __p) 770 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 771 : __base_(__p) {} 772 773 template <class _Alloc, 774 class _Up1, 775 class _Up2, 776 template <class...> class _And = _And, 777 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 778 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 779 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 780 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 781 : __base_(allocator_arg_t(), __a, __p) {} 782 783# if _LIBCPP_STD_VER >= 23 784 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 785 786 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 787 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 788 tuple(pair<_U1, _U2>& __p) 789 : __base_(__p) {} 790 791 template <class _Alloc, 792 class _U1, 793 class _U2, 794 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 795 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 796 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) 797 : __base_(allocator_arg_t(), __alloc, __p) {} 798# endif 799 800 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 801 802 template <class _Up1, 803 class _Up2, 804 template <class...> class _And = _And, 805 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 806 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 807 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) tuple(pair<_Up1, _Up2>&& __p) 808 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 809 : __base_(std::move(__p)) {} 810 811 template <class _Alloc, 812 class _Up1, 813 class _Up2, 814 template <class...> class _And = _And, 815 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 816 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 817 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 818 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 819 : __base_(allocator_arg_t(), __a, std::move(__p)) {} 820 821# if _LIBCPP_STD_VER >= 23 822 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 823 824 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 825 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 826 tuple(const pair<_U1, _U2>&& __p) 827 : __base_(std::move(__p)) {} 828 829 template <class _Alloc, 830 class _U1, 831 class _U2, 832 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 833 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 834 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 835 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 836# endif // _LIBCPP_STD_VER >= 23 837 838 _LIBCPP_DIAGNOSTIC_POP 839 840 // [tuple.assign] 841 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 842 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 843 _NOEXCEPT_((_And<is_nothrow_copy_assignable<_Tp>...>::value)) { 844 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 845 return *this; 846 } 847 848# if _LIBCPP_STD_VER >= 23 849 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const 850 requires(_And<is_copy_assignable<const _Tp>...>::value) 851 { 852 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 853 return *this; 854 } 855 856 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const 857 requires(_And<is_assignable<const _Tp&, _Tp>...>::value) 858 { 859 std::__memberwise_forward_assign( 860 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 861 return *this; 862 } 863# endif // _LIBCPP_STD_VER >= 23 864 865 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 866 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 867 _NOEXCEPT_((_And<is_nothrow_move_assignable<_Tp>...>::value)) { 868 std::__memberwise_forward_assign( 869 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 870 return *this; 871 } 872 873 template < 874 class... _Up, 875 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value, 876 int> = 0> 877 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...> const& __tuple) 878 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) { 879 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 880 return *this; 881 } 882 883 template <class... _Up, 884 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value, 885 int> = 0> 886 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...>&& __tuple) 887 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) { 888 std::__memberwise_forward_assign( 889 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 890 return *this; 891 } 892 893# if _LIBCPP_STD_VER >= 23 894 template <class... _UTypes, 895 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 896 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 897 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const { 898 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 899 return *this; 900 } 901 902 template <class... _UTypes, 903 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 904 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 905 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const { 906 std::__memberwise_forward_assign( 907 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 908 return *this; 909 } 910# endif // _LIBCPP_STD_VER >= 23 911 912 template <template <class...> class _Pred, 913 bool _Const, 914 class _Pair, 915 class _DecayedPair = __remove_cvref_t<_Pair>, 916 class _Tuple = tuple> 917 struct _AssignPredicateFromPair : false_type {}; 918 919 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 920 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 921 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 922 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {}; 923 924 template <bool _Const, class _Pair> 925 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 926 927 template <bool _Const, class _Pair> 928 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 929 930# if _LIBCPP_STD_VER >= 23 931 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 932 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const 933 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 934 std::get<0>(*this) = __pair.first; 935 std::get<1>(*this) = __pair.second; 936 return *this; 937 } 938 939 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 940 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const 941 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 942 std::get<0>(*this) = std::move(__pair.first); 943 std::get<1>(*this) = std::move(__pair.second); 944 return *this; 945 } 946# endif // _LIBCPP_STD_VER >= 23 947 948 template <class _Up1, 949 class _Up2, 950 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0> 951 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2> const& __pair) 952 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value)) { 953 std::get<0>(*this) = __pair.first; 954 std::get<1>(*this) = __pair.second; 955 return *this; 956 } 957 958 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0> 959 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2>&& __pair) 960 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value)) { 961 std::get<0>(*this) = std::forward<_Up1>(__pair.first); 962 std::get<1>(*this) = std::forward<_Up2>(__pair.second); 963 return *this; 964 } 965 966 // EXTENSION 967 template < 968 class _Up, 969 size_t _Np, 970 class = __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value > > 971 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np> const& __array) 972 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) { 973 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 974 return *this; 975 } 976 977 // EXTENSION 978 template <class _Up, 979 size_t _Np, 980 class = void, 981 class = __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value > > 982 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np>&& __array) 983 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) { 984 std::__memberwise_forward_assign( 985 *this, 986 std::move(__array), 987 __tuple_types<_If<true, _Up, _Tp>...>(), 988 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 989 return *this; 990 } 991 992 // [tuple.swap] 993 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple& __t) 994 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) { 995 __base_.swap(__t.__base_); 996 } 997 998# if _LIBCPP_STD_VER >= 23 999 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const 1000 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 1001 __base_.swap(__t.__base_); 1002 } 1003# endif // _LIBCPP_STD_VER >= 23 1004}; 1005 1006template <> 1007class _LIBCPP_TEMPLATE_VIS tuple<> { 1008public: 1009 constexpr tuple() _NOEXCEPT = default; 1010 template <class _Alloc> 1011 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1012 template <class _Alloc> 1013 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1014 template <class _Up> 1015 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {} 1016 template <class _Alloc, class _Up> 1017 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1018 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {} 1019# if _LIBCPP_STD_VER >= 23 1020 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1021# endif 1022}; 1023 1024# if _LIBCPP_STD_VER >= 23 1025template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual> 1026 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1027struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1028 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1029}; 1030 1031template <class... _TTypes, class... _UTypes> 1032 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1033struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1034 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1035}; 1036# endif // _LIBCPP_STD_VER >= 23 1037 1038# if _LIBCPP_STD_VER >= 17 1039template <class... _Tp> 1040tuple(_Tp...) -> tuple<_Tp...>; 1041template <class _Tp1, class _Tp2> 1042tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1043template <class _Alloc, class... _Tp> 1044tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1045template <class _Alloc, class _Tp1, class _Tp2> 1046tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1047template <class _Alloc, class... _Tp> 1048tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1049# endif 1050 1051template <class... _Tp, __enable_if_t<__all<__is_swappable<_Tp>::value...>::value, int> = 0> 1052inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1053 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) { 1054 __t.swap(__u); 1055} 1056 1057# if _LIBCPP_STD_VER >= 23 1058template <class... _Tp> 1059_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1060swap(const tuple<_Tp...>& __lhs, 1061 const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1062 __lhs.swap(__rhs); 1063} 1064# endif 1065 1066// get 1067 1068template <size_t _Ip, class... _Tp> 1069inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type& 1070get(tuple<_Tp...>& __t) _NOEXCEPT { 1071 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1072 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1073} 1074 1075template <size_t _Ip, class... _Tp> 1076inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1077get(const tuple<_Tp...>& __t) _NOEXCEPT { 1078 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1079 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1080} 1081 1082template <size_t _Ip, class... _Tp> 1083inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1084get(tuple<_Tp...>&& __t) _NOEXCEPT { 1085 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1086 return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1087} 1088 1089template <size_t _Ip, class... _Tp> 1090inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1091get(const tuple<_Tp...>&& __t) _NOEXCEPT { 1092 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1093 return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1094} 1095 1096# if _LIBCPP_STD_VER >= 14 1097 1098namespace __find_detail { 1099 1100static constexpr size_t __not_found = static_cast<size_t>(-1); 1101static constexpr size_t __ambiguous = __not_found - 1; 1102 1103inline _LIBCPP_HIDE_FROM_ABI constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { 1104 return !__matches ? __res : (__res == __not_found ? __curr_i : __ambiguous); 1105} 1106 1107template <size_t _Nx> 1108inline _LIBCPP_HIDE_FROM_ABI constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { 1109 return __i == _Nx 1110 ? __not_found 1111 : __find_detail::__find_idx_return(__i, __find_detail::__find_idx(__i + 1, __matches), __matches[__i]); 1112} 1113 1114template <class _T1, class... _Args> 1115struct __find_exactly_one_checked { 1116 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; 1117 static constexpr size_t value = __find_detail::__find_idx(0, __matches); 1118 static_assert(value != __not_found, "type not found in type list"); 1119 static_assert(value != __ambiguous, "type occurs more than once in type list"); 1120}; 1121 1122template <class _T1> 1123struct __find_exactly_one_checked<_T1> { 1124 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); 1125}; 1126 1127} // namespace __find_detail 1128 1129template <typename _T1, typename... _Args> 1130struct __find_exactly_one_t : public __find_detail::__find_exactly_one_checked<_T1, _Args...> {}; 1131 1132template <class _T1, class... _Args> 1133inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept { 1134 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1135} 1136 1137template <class _T1, class... _Args> 1138inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept { 1139 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1140} 1141 1142template <class _T1, class... _Args> 1143inline _LIBCPP_HIDE_FROM_ABI constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept { 1144 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1145} 1146 1147template <class _T1, class... _Args> 1148inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept { 1149 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1150} 1151 1152# endif 1153 1154// tie 1155 1156template <class... _Tp> 1157inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT { 1158 return tuple<_Tp&...>(__t...); 1159} 1160 1161template <class _Up> 1162struct __ignore_t { 1163 template <class _Tp> 1164 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const __ignore_t& operator=(_Tp&&) const { 1165 return *this; 1166 } 1167}; 1168 1169# if _LIBCPP_STD_VER >= 17 1170inline constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1171# else 1172namespace { 1173constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1174} // namespace 1175# endif 1176 1177template <class... _Tp> 1178inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<typename __unwrap_ref_decay<_Tp>::type...> 1179make_tuple(_Tp&&... __t) { 1180 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(std::forward<_Tp>(__t)...); 1181} 1182 1183template <class... _Tp> 1184inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT { 1185 return tuple<_Tp&&...>(std::forward<_Tp>(__t)...); 1186} 1187 1188template <size_t _Ip> 1189struct __tuple_equal { 1190 template <class _Tp, class _Up> 1191 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1192 return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y); 1193 } 1194}; 1195 1196template <> 1197struct __tuple_equal<0> { 1198 template <class _Tp, class _Up> 1199 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1200 return true; 1201 } 1202}; 1203 1204template <class... _Tp, class... _Up> 1205inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1206operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1207 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1208 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1209} 1210 1211# if _LIBCPP_STD_VER >= 20 1212 1213// operator<=> 1214 1215template <class... _Tp, class... _Up, size_t... _Is> 1216_LIBCPP_HIDE_FROM_ABI constexpr auto 1217__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1218 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1219 static_cast<void>( 1220 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...)); 1221 return __result; 1222} 1223 1224template <class... _Tp, class... _Up> 1225 requires(sizeof...(_Tp) == sizeof...(_Up)) 1226_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1227operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1228 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1229} 1230 1231# else // _LIBCPP_STD_VER >= 20 1232 1233template <class... _Tp, class... _Up> 1234inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1235operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1236 return !(__x == __y); 1237} 1238 1239template <size_t _Ip> 1240struct __tuple_less { 1241 template <class _Tp, class _Up> 1242 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1243 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1244 if (std::get<__idx>(__x) < std::get<__idx>(__y)) 1245 return true; 1246 if (std::get<__idx>(__y) < std::get<__idx>(__x)) 1247 return false; 1248 return __tuple_less<_Ip - 1>()(__x, __y); 1249 } 1250}; 1251 1252template <> 1253struct __tuple_less<0> { 1254 template <class _Tp, class _Up> 1255 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1256 return false; 1257 } 1258}; 1259 1260template <class... _Tp, class... _Up> 1261inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1262operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1263 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1264 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1265} 1266 1267template <class... _Tp, class... _Up> 1268inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1269operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1270 return __y < __x; 1271} 1272 1273template <class... _Tp, class... _Up> 1274inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1275operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1276 return !(__x < __y); 1277} 1278 1279template <class... _Tp, class... _Up> 1280inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1281operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1282 return !(__y < __x); 1283} 1284 1285# endif // _LIBCPP_STD_VER >= 20 1286 1287// tuple_cat 1288 1289template <class _Tp, class _Up> 1290struct __tuple_cat_type; 1291 1292template <class... _Ttypes, class... _Utypes> 1293struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > { 1294 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1295}; 1296 1297template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples> 1298struct __tuple_cat_return_1 {}; 1299 1300template <class... _Types, class _Tuple0> 1301struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> { 1302 using type _LIBCPP_NODEBUG = 1303 typename __tuple_cat_type< tuple<_Types...>, 1304 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type; 1305}; 1306 1307template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples> 1308struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1309 : public __tuple_cat_return_1< 1310 typename __tuple_cat_type< tuple<_Types...>, 1311 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type, 1312 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value, 1313 _Tuple1, 1314 _Tuples...> {}; 1315 1316template <class... _Tuples> 1317struct __tuple_cat_return; 1318 1319template <class _Tuple0, class... _Tuples> 1320struct __tuple_cat_return<_Tuple0, _Tuples...> 1321 : public __tuple_cat_return_1<tuple<>, 1322 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value, 1323 _Tuple0, 1324 _Tuples...> {}; 1325 1326template <> 1327struct __tuple_cat_return<> { 1328 typedef _LIBCPP_NODEBUG tuple<> type; 1329}; 1330 1331inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); } 1332 1333template <class _Rp, class _Indices, class _Tuple0, class... _Tuples> 1334struct __tuple_cat_return_ref_imp; 1335 1336template <class... _Types, size_t... _I0, class _Tuple0> 1337struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> { 1338 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1339 typedef tuple<_Types..., __apply_cv_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type; 1340}; 1341 1342template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples> 1343struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...> 1344 : public __tuple_cat_return_ref_imp< 1345 tuple<_Types..., 1346 __apply_cv_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>, 1347 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type, 1348 _Tuple1, 1349 _Tuples...> {}; 1350 1351template <class _Tuple0, class... _Tuples> 1352struct __tuple_cat_return_ref 1353 : public __tuple_cat_return_ref_imp< 1354 tuple<>, 1355 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type, 1356 _Tuple0, 1357 _Tuples...> {}; 1358 1359template <class _Types, class _I0, class _J0> 1360struct __tuple_cat; 1361 1362template <class... _Types, size_t... _I0, size_t... _J0> 1363struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > { 1364 template <class _Tuple0> 1365 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1366 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1367 operator()(tuple<_Types...> __t, _Tuple0&& __t0) { 1368 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1369 return std::forward_as_tuple( 1370 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...); 1371 } 1372 1373 template <class _Tuple0, class _Tuple1, class... _Tuples> 1374 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1375 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1376 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) { 1377 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1378 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1379 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple1> _T1; 1380 return __tuple_cat<tuple<_Types..., __apply_cv_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>, 1381 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type, 1382 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1383 std::forward_as_tuple( 1384 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...), 1385 std::forward<_Tuple1>(__t1), 1386 std::forward<_Tuples>(__tpls)...); 1387 } 1388}; 1389 1390template <class _Tuple0, class... _Tuples> 1391inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1392tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) { 1393 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1394 return __tuple_cat<tuple<>, __tuple_indices<>, typename __make_tuple_indices<tuple_size<_T0>::value>::type>()( 1395 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...); 1396} 1397 1398template <class... _Tp, class _Alloc> 1399struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {}; 1400 1401template <class _T1, class _T2> 1402template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> 1403inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_T1, _T2>::pair( 1404 piecewise_construct_t, 1405 tuple<_Args1...>& __first_args, 1406 tuple<_Args2...>& __second_args, 1407 __tuple_indices<_I1...>, 1408 __tuple_indices<_I2...>) 1409 : first(std::forward<_Args1>(std::get<_I1>(__first_args))...), 1410 second(std::forward<_Args2>(std::get<_I2>(__second_args))...) {} 1411 1412# if _LIBCPP_STD_VER >= 17 1413template <class _Tp> 1414inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 1415 1416# define _LIBCPP_NOEXCEPT_RETURN(...) \ 1417 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1418 1419// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting. 1420// clang-format off 1421template <class _Fn, class _Tuple, size_t... _Id> 1422inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) 1423__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>) 1424 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...)) 1425 1426template <class _Fn, class _Tuple> 1427inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t) 1428 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl( 1429 std::forward<_Fn>(__f), 1430 std::forward<_Tuple>(__t), 1431 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1432 1433template <class _Tp, class _Tuple, size_t... _Idx> 1434inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1435 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)) 1436 1437template <class _Tp, class _Tuple> 1438inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t) 1439 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>( 1440 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1441 1442# undef _LIBCPP_NOEXCEPT_RETURN 1443 1444# endif // _LIBCPP_STD_VER >= 17 1445 1446#endif // !defined(_LIBCPP_CXX03_LANG) 1447 1448_LIBCPP_END_NAMESPACE_STD 1449 1450_LIBCPP_POP_MACROS 1451 1452// clang-format on 1453 1454#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1455# include <exception> 1456# include <iosfwd> 1457# include <new> 1458# include <type_traits> 1459# include <typeinfo> 1460# include <utility> 1461#endif 1462 1463#endif // _LIBCPP_TUPLE 1464