1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TUPLE 11#define _LIBCPP_TUPLE 12 13// clang-format off 14 15/* 16 tuple synopsis 17 18namespace std 19{ 20 21template <class... T> 22class tuple { 23public: 24 explicit(see-below) constexpr tuple(); 25 explicit(see-below) tuple(const T&...); // constexpr in C++14 26 template <class... U> 27 explicit(see-below) tuple(U&&...); // constexpr in C++14 28 tuple(const tuple&) = default; 29 tuple(tuple&&) = default; 30 31 template<class... UTypes> 32 constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23 33 template <class... U> 34 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14 35 template <class... U> 36 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14 37 template<class... UTypes> 38 constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23 39 40 template<class U1, class U2> 41 constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23 42 template <class U1, class U2> 43 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14 44 template <class U1, class U2> 45 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14 46 template<class U1, class U2> 47 constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23 48 49 // allocator-extended constructors 50 template <class Alloc> 51 tuple(allocator_arg_t, const Alloc& a); 52 template <class Alloc> 53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20 54 template <class Alloc, class... U> 55 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20 56 template <class Alloc> 57 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20 58 template <class Alloc> 59 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20 60 template<class Alloc, class... UTypes> 61 constexpr explicit(see-below) 62 tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23 63 template <class Alloc, class... U> 64 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20 65 template <class Alloc, class... U> 66 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20 67 template<class Alloc, class... UTypes> 68 constexpr explicit(see-below) 69 tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23 70 template<class Alloc, class U1, class U2> 71 constexpr explicit(see-below) 72 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23 73 template <class Alloc, class U1, class U2> 74 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20 75 template <class Alloc, class U1, class U2> 76 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20 77 template<class Alloc, class U1, class U2> 78 constexpr explicit(see-below) 79 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23 80 81 tuple& operator=(const tuple&); // constexpr in C++20 82 constexpr const tuple& operator=(const tuple&) const; // C++23 83 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20 84 constexpr const tuple& operator=(tuple&&) const; // C++23 85 template <class... U> 86 tuple& operator=(const tuple<U...>&); // constexpr in C++20 87 template<class... UTypes> 88 constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23 89 template <class... U> 90 tuple& operator=(tuple<U...>&&); // constexpr in C++20 91 template<class... UTypes> 92 constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23 93 template <class U1, class U2> 94 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20 95 template<class U1, class U2> 96 constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23 97 template <class U1, class U2> 98 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20 99 template<class U1, class U2> 100 constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23 101 102 template<class U, size_t N> 103 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION 104 template<class U, size_t N> 105 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION 106 107 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20 108 constexpr void swap(const tuple&) const noexcept(see-below); // C++23 109}; 110 111 112template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23 113 requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; } 114struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> { 115 using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; 116}; 117 118template<class... TTypes, class... UTypes> // since C++23 119 requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; } 120struct common_type<tuple<TTypes...>, tuple<UTypes...>> { 121 using type = tuple<common_type_t<TTypes, UTypes>...>; 122}; 123 124template <class ...T> 125tuple(T...) -> tuple<T...>; // since C++17 126template <class T1, class T2> 127tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17 128template <class Alloc, class ...T> 129tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17 130template <class Alloc, class T1, class T2> 131tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17 132template <class Alloc, class ...T> 133tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17 134 135struct ignore-type { // exposition only // Since C++26 136 constexpr const ignore-type& 137 operator=(const auto &) const noexcept 138 { return *this; } 139}; 140inline constexpr ignore-type ignore; 141 142template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 143template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 144template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 145template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 146 147// [tuple.apply], calling a function with a tuple of arguments: 148template <class F, class Tuple> 149 constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23 150template <class T, class Tuple> 151 constexpr T make_from_tuple(Tuple&& t); // C++17 152 153// 20.4.1.4, tuple helper classes: 154template <class T> struct tuple_size; // undefined 155template <class... T> struct tuple_size<tuple<T...>>; 156template <class T> 157 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 158template <size_t I, class T> struct tuple_element; // undefined 159template <size_t I, class... T> struct tuple_element<I, tuple<T...>>; 160template <size_t I, class T> 161 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 162 163// 20.4.1.5, element access: 164template <size_t I, class... T> 165 typename tuple_element<I, tuple<T...>>::type& 166 get(tuple<T...>&) noexcept; // constexpr in C++14 167template <size_t I, class... T> 168 const typename tuple_element<I, tuple<T...>>::type& 169 get(const tuple<T...>&) noexcept; // constexpr in C++14 170template <size_t I, class... T> 171 typename tuple_element<I, tuple<T...>>::type&& 172 get(tuple<T...>&&) noexcept; // constexpr in C++14 173template <size_t I, class... T> 174 const typename tuple_element<I, tuple<T...>>::type&& 175 get(const tuple<T...>&&) noexcept; // constexpr in C++14 176 177template <class T1, class... T> 178 constexpr T1& get(tuple<T...>&) noexcept; // C++14 179template <class T1, class... T> 180 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 181template <class T1, class... T> 182 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 183template <class T1, class... T> 184 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 185 186// 20.4.1.6, relational operators: 187template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 188template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 189template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 190template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 191template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 192template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 193template<class... T, class... U> 194 constexpr common_comparison_category_t<synth-three-way-result<T, U>...> 195 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20 196 197template <class... Types, class Alloc> 198 struct uses_allocator<tuple<Types...>, Alloc>; 199 200template <class... Types> 201 void 202 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 203 204template <class... Types> 205 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23 206 207} // std 208 209*/ 210 211// clang-format on 212 213#include <__compare/common_comparison_category.h> 214#include <__compare/ordering.h> 215#include <__compare/synth_three_way.h> 216#include <__config> 217#include <__cstddef/size_t.h> 218#include <__fwd/array.h> 219#include <__fwd/pair.h> 220#include <__fwd/tuple.h> 221#include <__memory/allocator_arg_t.h> 222#include <__memory/uses_allocator.h> 223#include <__tuple/find_index.h> 224#include <__tuple/ignore.h> 225#include <__tuple/make_tuple_types.h> 226#include <__tuple/sfinae_helpers.h> 227#include <__tuple/tuple_element.h> 228#include <__tuple/tuple_indices.h> 229#include <__tuple/tuple_like_ext.h> 230#include <__tuple/tuple_size.h> 231#include <__tuple/tuple_types.h> 232#include <__type_traits/common_reference.h> 233#include <__type_traits/common_type.h> 234#include <__type_traits/conditional.h> 235#include <__type_traits/conjunction.h> 236#include <__type_traits/copy_cvref.h> 237#include <__type_traits/disjunction.h> 238#include <__type_traits/enable_if.h> 239#include <__type_traits/invoke.h> 240#include <__type_traits/is_arithmetic.h> 241#include <__type_traits/is_assignable.h> 242#include <__type_traits/is_constructible.h> 243#include <__type_traits/is_convertible.h> 244#include <__type_traits/is_empty.h> 245#include <__type_traits/is_final.h> 246#include <__type_traits/is_implicitly_default_constructible.h> 247#include <__type_traits/is_nothrow_assignable.h> 248#include <__type_traits/is_nothrow_constructible.h> 249#include <__type_traits/is_reference.h> 250#include <__type_traits/is_same.h> 251#include <__type_traits/is_swappable.h> 252#include <__type_traits/is_trivially_relocatable.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/declval.h> 261#include <__utility/forward.h> 262#include <__utility/integer_sequence.h> 263#include <__utility/move.h> 264#include <__utility/piecewise_construct.h> 265#include <__utility/swap.h> 266#include <version> 267 268// standard-mandated includes 269 270// [tuple.syn] 271#include <compare> 272 273#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 274# pragma GCC system_header 275#endif 276 277_LIBCPP_PUSH_MACROS 278#include <__undef_macros> 279 280_LIBCPP_BEGIN_NAMESPACE_STD 281 282#ifndef _LIBCPP_CXX03_LANG 283 284// __tuple_leaf 285 286template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value > 287class __tuple_leaf; 288 289template <size_t _Ip, class _Hp, bool _Ep> 290inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 291swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<_Hp>) { 292 swap(__x.get(), __y.get()); 293} 294 295template <size_t _Ip, class _Hp, bool _Ep> 296_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 297swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, 298 const __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<const _Hp>) { 299 swap(__x.get(), __y.get()); 300} 301 302template <size_t _Ip, class _Hp, bool> 303class __tuple_leaf { 304 _Hp __value_; 305 306 template <class _Tp> 307 static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() { 308# if __has_keyword(__reference_binds_to_temporary) 309 return !__reference_binds_to_temporary(_Hp, _Tp); 310# else 311 return true; 312# endif 313 } 314 315public: 316 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 317 318 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) : __value_() { 319 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 320 } 321 322 template <class _Alloc> 323 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() { 324 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 325 } 326 327 template <class _Alloc> 328 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 329 : __value_(allocator_arg_t(), __a) { 330 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 331 } 332 333 template <class _Alloc> 334 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) { 335 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 336 } 337 338 template < 339 class _Tp, 340 __enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, int> = 0> 341 _LIBCPP_HIDE_FROM_ABI 342 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value) 343 : __value_(std::forward<_Tp>(__t)) { 344 static_assert(__can_bind_reference<_Tp&&>(), 345 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 346 } 347 348 template <class _Tp, class _Alloc> 349 _LIBCPP_HIDE_FROM_ABI 350 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 351 : __value_(std::forward<_Tp>(__t)) { 352 static_assert(__can_bind_reference<_Tp&&>(), 353 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 354 } 355 356 template <class _Tp, class _Alloc> 357 _LIBCPP_HIDE_FROM_ABI 358 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 359 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) { 360 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 361 } 362 363 template <class _Tp, class _Alloc> 364 _LIBCPP_HIDE_FROM_ABI 365 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 366 : __value_(std::forward<_Tp>(__t), __a) { 367 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 368 } 369 370 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default; 371 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default; 372 373 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int 374 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) { 375 std::swap(*this, __t); 376 return 0; 377 } 378 379 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const 380 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) { 381 std::swap(*this, __t); 382 return 0; 383 } 384 385 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; } 386 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; } 387}; 388 389template <size_t _Ip, class _Hp> 390class __tuple_leaf<_Ip, _Hp, true> : private _Hp { 391public: 392 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 393 394 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) {} 395 396 template <class _Alloc> 397 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 398 399 template <class _Alloc> 400 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 401 : _Hp(allocator_arg_t(), __a) {} 402 403 template <class _Alloc> 404 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {} 405 406 template <class _Tp, 407 __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, 408 int> = 0> 409 _LIBCPP_HIDE_FROM_ABI 410 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value) 411 : _Hp(std::forward<_Tp>(__t)) {} 412 413 template <class _Tp, class _Alloc> 414 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 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, 1>, const _Alloc& __a, _Tp&& __t) 419 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {} 420 421 template <class _Tp, class _Alloc> 422 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 423 : _Hp(std::forward<_Tp>(__t), __a) {} 424 425 __tuple_leaf(__tuple_leaf const&) = default; 426 __tuple_leaf(__tuple_leaf&&) = default; 427 428 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int 429 swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) { 430 std::swap(*this, __t); 431 return 0; 432 } 433 434 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const 435 noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) { 436 std::swap(*this, __rhs); 437 return 0; 438 } 439 440 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); } 441 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { 442 return static_cast<const _Hp&>(*this); 443 } 444}; 445 446template <class... _Tp> 447_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {} 448 449template <class _Tp> 450struct __all_default_constructible; 451 452template <class... _Tp> 453struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {}; 454 455// __tuple_impl 456 457template <class _Indx, class... _Tp> 458struct __tuple_impl; 459 460template <size_t... _Indx, class... _Tp> 461struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 462 : public __tuple_leaf<_Indx, _Tp>... { 463 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept( 464 __all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 465 466 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 467 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 468 __tuple_indices<_Uf...>, 469 __tuple_types<_Tf...>, 470 __tuple_indices<_Ul...>, 471 __tuple_types<_Tl...>, 472 _Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 473 __all<is_nothrow_default_constructible<_Tl>::value...>::value) 474 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {} 475 476 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 477 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 478 allocator_arg_t, 479 const _Alloc& __a, 480 __tuple_indices<_Uf...>, 481 __tuple_types<_Tf...>, 482 __tuple_indices<_Ul...>, 483 __tuple_types<_Tl...>, 484 _Up&&... __u) 485 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))..., 486 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {} 487 488 template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 489 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) noexcept( 490 (__all<is_nothrow_constructible< 491 _Tp, 492 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 493 : __tuple_leaf<_Indx, _Tp>( 494 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 495 std::get<_Indx>(__t)))... {} 496 497 template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 498 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 499 : __tuple_leaf<_Indx, _Tp>( 500 __uses_alloc_ctor<_Tp, 501 _Alloc, 502 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(), 503 __a, 504 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 505 std::get<_Indx>(__t)))... {} 506 507 __tuple_impl(const __tuple_impl&) = default; 508 __tuple_impl(__tuple_impl&&) = default; 509 510 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 511 swap(__tuple_impl& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 512 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 513 } 514 515 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const 516 noexcept(__all<__is_nothrow_swappable_v<const _Tp>...>::value) { 517 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 518 } 519}; 520 521template <class _Dest, class _Source, size_t... _Np> 522_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 523__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 524 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...); 525} 526 527template <class _Dest, class _Source, class... _Up, size_t... _Np> 528_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 529__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 530 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...); 531} 532 533template <class... _Tp> 534class _LIBCPP_TEMPLATE_VIS tuple { 535 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 536 537 _BaseT __base_; 538 539 template <size_t _Jp, class... _Up> 540 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 541 template <size_t _Jp, class... _Up> 542 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type& 543 get(const tuple<_Up...>&) _NOEXCEPT; 544 template <size_t _Jp, class... _Up> 545 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&& 546 get(tuple<_Up...>&&) _NOEXCEPT; 547 template <size_t _Jp, class... _Up> 548 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&& 549 get(const tuple<_Up...>&&) _NOEXCEPT; 550 551public: 552 using __trivially_relocatable = __conditional_t<_And<__libcpp_is_trivially_relocatable<_Tp>...>::value, tuple, void>; 553 554 // [tuple.cnstr] 555 556 // tuple() constructors (including allocator_arg_t variants) 557 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 558 template <class...> class _IsDefault = is_default_constructible, 559 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 560 _LIBCPP_HIDE_FROM_ABI constexpr explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 561 tuple() noexcept(_And<is_nothrow_default_constructible<_Tp>...>::value) {} 562 563 template <class _Alloc, 564 template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 565 template <class...> class _IsDefault = is_default_constructible, 566 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 567 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 568 tuple(allocator_arg_t, _Alloc const& __a) 569 : __base_(allocator_arg_t(), 570 __a, 571 __tuple_indices<>(), 572 __tuple_types<>(), 573 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 574 __tuple_types<_Tp...>()) {} 575 576 // tuple(const T&...) constructors (including allocator_arg_t variants) 577 template <template <class...> class _And = _And, 578 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 579 _LIBCPP_HIDE_FROM_ABI 580 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 581 tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value) 582 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 583 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 584 typename __make_tuple_indices<0>::type(), 585 typename __make_tuple_types<tuple, 0>::type(), 586 __t...) {} 587 588 template <class _Alloc, 589 template <class...> class _And = _And, 590 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 591 _LIBCPP_HIDE_FROM_ABI 592 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 593 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t) 594 : __base_(allocator_arg_t(), 595 __a, 596 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 597 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 598 typename __make_tuple_indices<0>::type(), 599 typename __make_tuple_types<tuple, 0>::type(), 600 __t...) {} 601 602 // tuple(U&& ...) constructors (including allocator_arg_t variants) 603 template <class... _Up> 604 struct _IsThisTuple : false_type {}; 605 template <class _Up> 606 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {}; 607 608 template <class... _Up> 609 struct _EnableUTypesCtor 610 : _And< _BoolConstant<sizeof...(_Tp) >= 1>, 611 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 612 is_constructible<_Tp, _Up>... > {}; 613 614 template <class... _Up, 615 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 616 int> = 0> 617 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 618 tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 619 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 620 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 621 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 622 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 623 std::forward<_Up>(__u)...) {} 624 625 template <class _Alloc, 626 class... _Up, 627 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 628 int> = 0> 629 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 630 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 631 : __base_(allocator_arg_t(), 632 __a, 633 typename __make_tuple_indices<sizeof...(_Up)>::type(), 634 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 635 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 636 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 637 std::forward<_Up>(__u)...) {} 638 639 // Copy and move constructors (including the allocator_arg_t variants) 640 tuple(const tuple&) = default; 641 tuple(tuple&&) = default; 642 643 template <class _Alloc, 644 template <class...> class _And = _And, 645 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0> 646 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 647 : __base_(allocator_arg_t(), __alloc, __t) {} 648 649 template <class _Alloc, 650 template <class...> class _And = _And, 651 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0> 652 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 653 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 654 655 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 656 657 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void> 658 struct _EnableCtorFromUTypesTuple : false_type {}; 659 660 template <class _OtherTuple, class... _Up> 661 struct _EnableCtorFromUTypesTuple< 662 _OtherTuple, 663 tuple<_Up...>, 664 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 665 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> 666 : _And< 667 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor 668 // can work. Otherwise, is_constructible can trigger hard error in those cases 669 // https://godbolt.org/z/M94cGdKcE 670 _Not<is_same<_OtherTuple, const tuple&> >, 671 _Not<is_same<_OtherTuple, tuple&&> >, 672 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 673 _Lazy<_Or, 674 _BoolConstant<sizeof...(_Tp) != 1>, 675 // _Tp and _Up are 1-element packs - the pack expansions look 676 // weird to avoid tripping up the type traits in degenerate cases 677 _Lazy<_And, 678 _Not<is_same<_Tp, _Up> >..., 679 _Not<is_convertible<_OtherTuple, _Tp> >..., 680 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {}; 681 682 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 683 _LIBCPP_HIDE_FROM_ABI 684 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 685 tuple(const tuple<_Up...>& __t) noexcept(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value) 686 : __base_(__t) {} 687 688 template <class... _Up, 689 class _Alloc, 690 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 691 _LIBCPP_HIDE_FROM_ABI 692 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 693 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 694 : __base_(allocator_arg_t(), __a, __t) {} 695 696# if _LIBCPP_STD_VER >= 23 697 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 698 699 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 700 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t) 701 : __base_(__t) {} 702 703 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 704 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) 705 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) 706 : __base_(allocator_arg_t(), __alloc, __t) {} 707# endif // _LIBCPP_STD_VER >= 23 708 709 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 710 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 711 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 712 tuple(tuple<_Up...>&& __t) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 713 : __base_(std::move(__t)) {} 714 715 template <class _Alloc, 716 class... _Up, 717 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 718 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 719 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 720 : __base_(allocator_arg_t(), __a, std::move(__t)) {} 721 722# if _LIBCPP_STD_VER >= 23 723 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 724 725 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 726 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 727 tuple(const tuple<_Up...>&& __t) 728 : __base_(std::move(__t)) {} 729 730 template <class _Alloc, 731 class... _Up, 732 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 733 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 734 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 735 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 736# endif // _LIBCPP_STD_VER >= 23 737 738 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 739 740 template <template <class...> class _Pred, 741 class _Pair, 742 class _DecayedPair = __remove_cvref_t<_Pair>, 743 class _Tuple = tuple> 744 struct _CtorPredicateFromPair : false_type {}; 745 746 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 747 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 748 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {}; 749 750 template <class _Pair> 751 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {}; 752 753 template <class _Pair> 754 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {}; 755 756 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 757 struct _BothImplicitlyConvertible : false_type {}; 758 759 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 760 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 761 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {}; 762 763 template <class _Up1, 764 class _Up2, 765 template <class...> class _And = _And, 766 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 767 _LIBCPP_HIDE_FROM_ABI 768 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 769 tuple(const pair<_Up1, _Up2>& __p) noexcept(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value) 770 : __base_(__p) {} 771 772 template <class _Alloc, 773 class _Up1, 774 class _Up2, 775 template <class...> class _And = _And, 776 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 777 _LIBCPP_HIDE_FROM_ABI 778 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 779 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 780 : __base_(allocator_arg_t(), __a, __p) {} 781 782# if _LIBCPP_STD_VER >= 23 783 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 784 785 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 786 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 787 tuple(pair<_U1, _U2>& __p) 788 : __base_(__p) {} 789 790 template <class _Alloc, 791 class _U1, 792 class _U2, 793 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 794 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 795 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) 796 : __base_(allocator_arg_t(), __alloc, __p) {} 797# endif 798 799 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 800 801 template <class _Up1, 802 class _Up2, 803 template <class...> class _And = _And, 804 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 805 _LIBCPP_HIDE_FROM_ABI 806 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 807 tuple(pair<_Up1, _Up2>&& __p) noexcept(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value) 808 : __base_(std::move(__p)) {} 809 810 template <class _Alloc, 811 class _Up1, 812 class _Up2, 813 template <class...> class _And = _And, 814 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 815 _LIBCPP_HIDE_FROM_ABI 816 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 817 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 818 : __base_(allocator_arg_t(), __a, std::move(__p)) {} 819 820# if _LIBCPP_STD_VER >= 23 821 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 822 823 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 824 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 825 tuple(const pair<_U1, _U2>&& __p) 826 : __base_(std::move(__p)) {} 827 828 template <class _Alloc, 829 class _U1, 830 class _U2, 831 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 832 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 833 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 834 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 835# endif // _LIBCPP_STD_VER >= 23 836 837 // [tuple.assign] 838 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 839 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) noexcept( 840 _And<is_nothrow_copy_assignable<_Tp>...>::value) { 841 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 842 return *this; 843 } 844 845# if _LIBCPP_STD_VER >= 23 846 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const 847 requires(_And<is_copy_assignable<const _Tp>...>::value) 848 { 849 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 850 return *this; 851 } 852 853 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const 854 requires(_And<is_assignable<const _Tp&, _Tp>...>::value) 855 { 856 std::__memberwise_forward_assign( 857 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 858 return *this; 859 } 860# endif // _LIBCPP_STD_VER >= 23 861 862 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 863 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) noexcept( 864 _And<is_nothrow_move_assignable<_Tp>...>::value) { 865 std::__memberwise_forward_assign( 866 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 867 return *this; 868 } 869 870 template < 871 class... _Up, 872 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value, 873 int> = 0> 874 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 875 operator=(tuple<_Up...> const& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 876 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 877 return *this; 878 } 879 880 template <class... _Up, 881 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value, 882 int> = 0> 883 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 884 operator=(tuple<_Up...>&& __tuple) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 885 std::__memberwise_forward_assign( 886 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 887 return *this; 888 } 889 890# if _LIBCPP_STD_VER >= 23 891 template <class... _UTypes, 892 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 893 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 894 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const { 895 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 896 return *this; 897 } 898 899 template <class... _UTypes, 900 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 901 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 902 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const { 903 std::__memberwise_forward_assign( 904 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 905 return *this; 906 } 907# endif // _LIBCPP_STD_VER >= 23 908 909 template <template <class...> class _Pred, 910 bool _Const, 911 class _Pair, 912 class _DecayedPair = __remove_cvref_t<_Pair>, 913 class _Tuple = tuple> 914 struct _AssignPredicateFromPair : false_type {}; 915 916 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 917 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 918 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 919 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {}; 920 921 template <bool _Const, class _Pair> 922 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 923 924 template <bool _Const, class _Pair> 925 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 926 927# if _LIBCPP_STD_VER >= 23 928 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 929 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const 930 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 931 std::get<0>(*this) = __pair.first; 932 std::get<1>(*this) = __pair.second; 933 return *this; 934 } 935 936 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 937 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const 938 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 939 std::get<0>(*this) = std::move(__pair.first); 940 std::get<1>(*this) = std::move(__pair.second); 941 return *this; 942 } 943# endif // _LIBCPP_STD_VER >= 23 944 945 template <class _Up1, 946 class _Up2, 947 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0> 948 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 949 operator=(pair<_Up1, _Up2> const& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) { 950 std::get<0>(*this) = __pair.first; 951 std::get<1>(*this) = __pair.second; 952 return *this; 953 } 954 955 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0> 956 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 957 operator=(pair<_Up1, _Up2>&& __pair) noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) { 958 std::get<0>(*this) = std::forward<_Up1>(__pair.first); 959 std::get<1>(*this) = std::forward<_Up2>(__pair.second); 960 return *this; 961 } 962 963 // EXTENSION 964 template < 965 class _Up, 966 size_t _Np, 967 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0> 968 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 969 operator=(array<_Up, _Np> const& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 970 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 971 return *this; 972 } 973 974 // EXTENSION 975 template <class _Up, 976 size_t _Np, 977 class = void, 978 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0> 979 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 980 operator=(array<_Up, _Np>&& __array) noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 981 std::__memberwise_forward_assign( 982 *this, 983 std::move(__array), 984 __tuple_types<_If<true, _Up, _Tp>...>(), 985 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 986 return *this; 987 } 988 989 // [tuple.swap] 990 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 991 swap(tuple& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 992 __base_.swap(__t.__base_); 993 } 994 995# if _LIBCPP_STD_VER >= 23 996 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const 997 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 998 __base_.swap(__t.__base_); 999 } 1000# endif // _LIBCPP_STD_VER >= 23 1001}; 1002 1003template <> 1004class _LIBCPP_TEMPLATE_VIS tuple<> { 1005public: 1006 constexpr tuple() _NOEXCEPT = default; 1007 template <class _Alloc> 1008 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1009 template <class _Alloc> 1010 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1011 template <class _Up> 1012 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {} 1013 template <class _Alloc, class _Up> 1014 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1015 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {} 1016# if _LIBCPP_STD_VER >= 23 1017 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1018# endif 1019}; 1020 1021# if _LIBCPP_STD_VER >= 23 1022template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual> 1023 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1024struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1025 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1026}; 1027 1028template <class... _TTypes, class... _UTypes> 1029 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1030struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1031 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1032}; 1033# endif // _LIBCPP_STD_VER >= 23 1034 1035# if _LIBCPP_STD_VER >= 17 1036template <class... _Tp> 1037tuple(_Tp...) -> tuple<_Tp...>; 1038template <class _Tp1, class _Tp2> 1039tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1040template <class _Alloc, class... _Tp> 1041tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1042template <class _Alloc, class _Tp1, class _Tp2> 1043tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1044template <class _Alloc, class... _Tp> 1045tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1046# endif 1047 1048template <class... _Tp, __enable_if_t<__all<__is_swappable_v<_Tp>...>::value, int> = 0> 1049inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 1050swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) { 1051 __t.swap(__u); 1052} 1053 1054# if _LIBCPP_STD_VER >= 23 1055template <class... _Tp> 1056_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1057swap(const tuple<_Tp...>& __lhs, 1058 const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1059 __lhs.swap(__rhs); 1060} 1061# endif 1062 1063// get 1064 1065template <size_t _Ip, class... _Tp> 1066inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type& 1067get(tuple<_Tp...>& __t) _NOEXCEPT { 1068 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1069 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1070} 1071 1072template <size_t _Ip, class... _Tp> 1073inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1074get(const tuple<_Tp...>& __t) _NOEXCEPT { 1075 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1076 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1077} 1078 1079template <size_t _Ip, class... _Tp> 1080inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1081get(tuple<_Tp...>&& __t) _NOEXCEPT { 1082 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1083 return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1084} 1085 1086template <size_t _Ip, class... _Tp> 1087inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1088get(const tuple<_Tp...>&& __t) _NOEXCEPT { 1089 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1090 return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1091} 1092 1093# if _LIBCPP_STD_VER >= 14 1094 1095template <class _T1, class... _Args> 1096inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept { 1097 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1098} 1099 1100template <class _T1, class... _Args> 1101inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __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&& get(tuple<_Args...>&& __tup) noexcept { 1107 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1108} 1109 1110template <class _T1, class... _Args> 1111inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept { 1112 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1113} 1114 1115# endif 1116 1117// tie 1118 1119template <class... _Tp> 1120inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT { 1121 return tuple<_Tp&...>(__t...); 1122} 1123 1124template <class... _Tp> 1125inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<typename __unwrap_ref_decay<_Tp>::type...> 1126make_tuple(_Tp&&... __t) { 1127 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(std::forward<_Tp>(__t)...); 1128} 1129 1130template <class... _Tp> 1131inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT { 1132 return tuple<_Tp&&...>(std::forward<_Tp>(__t)...); 1133} 1134 1135template <size_t _Ip> 1136struct __tuple_equal { 1137 template <class _Tp, class _Up> 1138 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1139 return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y); 1140 } 1141}; 1142 1143template <> 1144struct __tuple_equal<0> { 1145 template <class _Tp, class _Up> 1146 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1147 return true; 1148 } 1149}; 1150 1151template <class... _Tp, class... _Up> 1152inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1153operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1154 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1155 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1156} 1157 1158# if _LIBCPP_STD_VER >= 20 1159 1160// operator<=> 1161 1162template <class... _Tp, class... _Up, size_t... _Is> 1163_LIBCPP_HIDE_FROM_ABI constexpr auto 1164__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1165 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1166 static_cast<void>( 1167 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...)); 1168 return __result; 1169} 1170 1171template <class... _Tp, class... _Up> 1172 requires(sizeof...(_Tp) == sizeof...(_Up)) 1173_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1174operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1175 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1176} 1177 1178# else // _LIBCPP_STD_VER >= 20 1179 1180template <class... _Tp, class... _Up> 1181inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1182operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1183 return !(__x == __y); 1184} 1185 1186template <size_t _Ip> 1187struct __tuple_less { 1188 template <class _Tp, class _Up> 1189 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1190 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1191 if (std::get<__idx>(__x) < std::get<__idx>(__y)) 1192 return true; 1193 if (std::get<__idx>(__y) < std::get<__idx>(__x)) 1194 return false; 1195 return __tuple_less<_Ip - 1>()(__x, __y); 1196 } 1197}; 1198 1199template <> 1200struct __tuple_less<0> { 1201 template <class _Tp, class _Up> 1202 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1203 return false; 1204 } 1205}; 1206 1207template <class... _Tp, class... _Up> 1208inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1209operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1210 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1211 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1212} 1213 1214template <class... _Tp, class... _Up> 1215inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1216operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1217 return __y < __x; 1218} 1219 1220template <class... _Tp, class... _Up> 1221inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1222operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1223 return !(__x < __y); 1224} 1225 1226template <class... _Tp, class... _Up> 1227inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1228operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1229 return !(__y < __x); 1230} 1231 1232# endif // _LIBCPP_STD_VER >= 20 1233 1234// tuple_cat 1235 1236template <class _Tp, class _Up> 1237struct __tuple_cat_type; 1238 1239template <class... _Ttypes, class... _Utypes> 1240struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > { 1241 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1242}; 1243 1244template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples> 1245struct __tuple_cat_return_1 {}; 1246 1247template <class... _Types, class _Tuple0> 1248struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> { 1249 using type _LIBCPP_NODEBUG = 1250 typename __tuple_cat_type< tuple<_Types...>, 1251 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type; 1252}; 1253 1254template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples> 1255struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1256 : public __tuple_cat_return_1< 1257 typename __tuple_cat_type< tuple<_Types...>, 1258 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type, 1259 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value, 1260 _Tuple1, 1261 _Tuples...> {}; 1262 1263template <class... _Tuples> 1264struct __tuple_cat_return; 1265 1266template <class _Tuple0, class... _Tuples> 1267struct __tuple_cat_return<_Tuple0, _Tuples...> 1268 : public __tuple_cat_return_1<tuple<>, 1269 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value, 1270 _Tuple0, 1271 _Tuples...> {}; 1272 1273template <> 1274struct __tuple_cat_return<> { 1275 typedef _LIBCPP_NODEBUG tuple<> type; 1276}; 1277 1278inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); } 1279 1280template <class _Rp, class _Indices, class _Tuple0, class... _Tuples> 1281struct __tuple_cat_return_ref_imp; 1282 1283template <class... _Types, size_t... _I0, class _Tuple0> 1284struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> { 1285 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1286 typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type; 1287}; 1288 1289template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples> 1290struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...> 1291 : public __tuple_cat_return_ref_imp< 1292 tuple<_Types..., 1293 __copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>, 1294 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type, 1295 _Tuple1, 1296 _Tuples...> {}; 1297 1298template <class _Tuple0, class... _Tuples> 1299struct __tuple_cat_return_ref 1300 : public __tuple_cat_return_ref_imp< 1301 tuple<>, 1302 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type, 1303 _Tuple0, 1304 _Tuples...> {}; 1305 1306template <class _Types, class _I0, class _J0> 1307struct __tuple_cat; 1308 1309template <class... _Types, size_t... _I0, size_t... _J0> 1310struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > { 1311 template <class _Tuple0> 1312 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1313 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1314 operator()(tuple<_Types...> __t, _Tuple0&& __t0) { 1315 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1316 return std::forward_as_tuple( 1317 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...); 1318 } 1319 1320 template <class _Tuple0, class _Tuple1, class... _Tuples> 1321 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1322 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1323 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) { 1324 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1325 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1326 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple1> _T1; 1327 return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>, 1328 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type, 1329 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1330 std::forward_as_tuple( 1331 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...), 1332 std::forward<_Tuple1>(__t1), 1333 std::forward<_Tuples>(__tpls)...); 1334 } 1335}; 1336 1337template <class _Tuple0, class... _Tuples> 1338inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1339tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) { 1340 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1341 return __tuple_cat<tuple<>, __tuple_indices<>, typename __make_tuple_indices<tuple_size<_T0>::value>::type>()( 1342 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...); 1343} 1344 1345template <class... _Tp, class _Alloc> 1346struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {}; 1347 1348# if _LIBCPP_STD_VER >= 17 1349# define _LIBCPP_NOEXCEPT_RETURN(...) \ 1350 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1351 1352// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting. 1353// clang-format off 1354template <class _Fn, class _Tuple, size_t... _Id> 1355inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) 1356__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>) 1357 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...)) 1358 1359template <class _Fn, class _Tuple> 1360inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t) 1361 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl( 1362 std::forward<_Fn>(__f), 1363 std::forward<_Tuple>(__t), 1364 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1365 1366#if _LIBCPP_STD_VER >= 20 1367template <class _Tp, class _Tuple, size_t... _Idx> 1368inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1369 noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))) 1370 requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> { 1371 return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); 1372} 1373#else 1374template <class _Tp, class _Tuple, size_t... _Idx> 1375inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>, 1376 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr) 1377 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)) 1378#endif // _LIBCPP_STD_VER >= 20 1379 1380template <class _Tp, class _Tuple, 1381 class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void> 1382inline constexpr bool __can_make_from_tuple = false; 1383 1384template <class _Tp, class _Tuple, size_t... _Idx> 1385inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>, 1386 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true; 1387 1388// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9, 1389// the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple 1390// SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl 1391// so that std::__make_from_tuple_impl will have the same advantages when used alone. 1392#if _LIBCPP_STD_VER >= 20 1393template <class _Tp, class _Tuple> 1394 requires __can_make_from_tuple<_Tp, _Tuple> // strengthen 1395#else 1396template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen 1397#endif // _LIBCPP_STD_VER >= 20 1398inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t) 1399 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>( 1400 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1401# undef _LIBCPP_NOEXCEPT_RETURN 1402 1403# endif // _LIBCPP_STD_VER >= 17 1404 1405#endif // !defined(_LIBCPP_CXX03_LANG) 1406 1407_LIBCPP_END_NAMESPACE_STD 1408 1409_LIBCPP_POP_MACROS 1410 1411// clang-format on 1412 1413#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1414# include <cstddef> 1415# include <exception> 1416# include <iosfwd> 1417# include <new> 1418# include <type_traits> 1419# include <typeinfo> 1420# include <utility> 1421#endif 1422 1423#endif // _LIBCPP_TUPLE 1424