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 <__compare/common_comparison_category.h> 209#include <__compare/synth_three_way.h> 210#include <__config> 211#include <__functional/invoke.h> 212#include <__fwd/array.h> 213#include <__fwd/pair.h> 214#include <__fwd/tuple.h> 215#include <__memory/allocator_arg_t.h> 216#include <__memory/uses_allocator.h> 217#include <__tuple/find_index.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_empty.h> 237#include <__type_traits/is_final.h> 238#include <__type_traits/is_implicitly_default_constructible.h> 239#include <__type_traits/is_nothrow_assignable.h> 240#include <__type_traits/is_nothrow_constructible.h> 241#include <__type_traits/is_reference.h> 242#include <__type_traits/is_same.h> 243#include <__type_traits/is_swappable.h> 244#include <__type_traits/lazy.h> 245#include <__type_traits/maybe_const.h> 246#include <__type_traits/nat.h> 247#include <__type_traits/negation.h> 248#include <__type_traits/remove_cvref.h> 249#include <__type_traits/remove_reference.h> 250#include <__type_traits/unwrap_ref.h> 251#include <__utility/forward.h> 252#include <__utility/integer_sequence.h> 253#include <__utility/move.h> 254#include <__utility/piecewise_construct.h> 255#include <__utility/swap.h> 256#include <cstddef> 257#include <version> 258 259// standard-mandated includes 260 261// [tuple.syn] 262#include <compare> 263 264#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 265# pragma GCC system_header 266#endif 267 268_LIBCPP_PUSH_MACROS 269#include <__undef_macros> 270 271_LIBCPP_BEGIN_NAMESPACE_STD 272 273#ifndef _LIBCPP_CXX03_LANG 274 275// __tuple_leaf 276 277template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value > 278class __tuple_leaf; 279 280template <size_t _Ip, class _Hp, bool _Ep> 281inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 282swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 283 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) { 284 swap(__x.get(), __y.get()); 285} 286 287template <size_t _Ip, class _Hp, bool _Ep> 288_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 289swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, const __tuple_leaf<_Ip, _Hp, _Ep>& __y) 290 _NOEXCEPT_(__is_nothrow_swappable<const _Hp>::value) { 291 swap(__x.get(), __y.get()); 292} 293 294template <size_t _Ip, class _Hp, bool> 295class __tuple_leaf { 296 _Hp __value_; 297 298 template <class _Tp> 299 static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() { 300# if __has_keyword(__reference_binds_to_temporary) 301 return !__reference_binds_to_temporary(_Hp, _Tp); 302# else 303 return true; 304# endif 305 } 306 307 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 308 309public: 310 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_() { 311 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 312 } 313 314 template <class _Alloc> 315 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() { 316 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 317 } 318 319 template <class _Alloc> 320 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 321 : __value_(allocator_arg_t(), __a) { 322 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 323 } 324 325 template <class _Alloc> 326 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) { 327 static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple"); 328 } 329 330 template <class _Tp, 331 __enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, 332 int> = 0> 333 _LIBCPP_HIDE_FROM_ABI 334 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_(is_nothrow_constructible<_Hp, _Tp>::value) 335 : __value_(std::forward<_Tp>(__t)) { 336 static_assert(__can_bind_reference<_Tp&&>(), 337 "Attempted construction of reference element binds to a temporary whose lifetime has ended"); 338 } 339 340 template <class _Tp, class _Alloc> 341 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf( 342 integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 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 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf( 350 integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 351 : __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) { 352 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 353 } 354 355 template <class _Tp, class _Alloc> 356 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf( 357 integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 358 : __value_(std::forward<_Tp>(__t), __a) { 359 static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple"); 360 } 361 362 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default; 363 _LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default; 364 365 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(__tuple_leaf& __t) 366 _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) { 367 std::swap(*this, __t); 368 return 0; 369 } 370 371 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const 372 _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 373 std::swap(*this, __t); 374 return 0; 375 } 376 377 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; } 378 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; } 379}; 380 381template <size_t _Ip, class _Hp> 382class __tuple_leaf<_Ip, _Hp, true> : private _Hp { 383 _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete; 384 385public: 386 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 387 388 template <class _Alloc> 389 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 390 391 template <class _Alloc> 392 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 393 : _Hp(allocator_arg_t(), __a) {} 394 395 template <class _Alloc> 396 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {} 397 398 template <class _Tp, 399 __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, 400 int> = 0> 401 _LIBCPP_HIDE_FROM_ABI 402 _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_(is_nothrow_constructible<_Hp, _Tp>::value) 403 : _Hp(std::forward<_Tp>(__t)) {} 404 405 template <class _Tp, class _Alloc> 406 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 407 : _Hp(std::forward<_Tp>(__t)) {} 408 409 template <class _Tp, class _Alloc> 410 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 411 : _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {} 412 413 template <class _Tp, class _Alloc> 414 _LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 415 : _Hp(std::forward<_Tp>(__t), __a) {} 416 417 __tuple_leaf(__tuple_leaf const&) = default; 418 __tuple_leaf(__tuple_leaf&&) = default; 419 420 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(__tuple_leaf& __t) 421 _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) { 422 std::swap(*this, __t); 423 return 0; 424 } 425 426 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const 427 _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 428 std::swap(*this, __rhs); 429 return 0; 430 } 431 432 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); } 433 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { 434 return static_cast<const _Hp&>(*this); 435 } 436}; 437 438template <class... _Tp> 439_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {} 440 441template <class _Tp> 442struct __all_default_constructible; 443 444template <class... _Tp> 445struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {}; 446 447// __tuple_impl 448 449template <class _Indx, class... _Tp> 450struct __tuple_impl; 451 452template <size_t... _Indx, class... _Tp> 453struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 454 : public __tuple_leaf<_Indx, _Tp>... { 455 _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() 456 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 457 458 template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 459 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 460 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, __tuple_indices<_Ul...>, __tuple_types<_Tl...>, _Up&&... __u) 461 _NOEXCEPT_(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value&& 462 __all<is_nothrow_default_constructible<_Tl>::value...>::value) 463 : __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {} 464 465 template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up> 466 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( 467 allocator_arg_t, 468 const _Alloc& __a, 469 __tuple_indices<_Uf...>, 470 __tuple_types<_Tf...>, 471 __tuple_indices<_Ul...>, 472 __tuple_types<_Tl...>, 473 _Up&&... __u) 474 : __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))..., 475 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {} 476 477 template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 478 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) _NOEXCEPT_( 479 (__all<is_nothrow_constructible< 480 _Tp, 481 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 482 : __tuple_leaf<_Indx, _Tp>( 483 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 484 std::get<_Indx>(__t)))... {} 485 486 template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0> 487 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 488 : __tuple_leaf<_Indx, _Tp>( 489 __uses_alloc_ctor<_Tp, 490 _Alloc, 491 typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(), 492 __a, 493 std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>( 494 std::get<_Indx>(__t)))... {} 495 496 __tuple_impl(const __tuple_impl&) = default; 497 __tuple_impl(__tuple_impl&&) = default; 498 499 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(__tuple_impl& __t) 500 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) { 501 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 502 } 503 504 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const 505 _NOEXCEPT_(__all<__is_nothrow_swappable<const _Tp>::value...>::value) { 506 std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 507 } 508}; 509 510template <class _Dest, class _Source, size_t... _Np> 511_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 512__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 513 std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...); 514} 515 516template <class _Dest, class _Source, class... _Up, size_t... _Np> 517_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 518__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 519 std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...); 520} 521 522template <class... _Tp> 523class _LIBCPP_TEMPLATE_VIS tuple { 524 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 525 526 _BaseT __base_; 527 528 template <size_t _Jp, class... _Up> 529 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 530 template <size_t _Jp, class... _Up> 531 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type& 532 get(const tuple<_Up...>&) _NOEXCEPT; 533 template <size_t _Jp, class... _Up> 534 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&& 535 get(tuple<_Up...>&&) _NOEXCEPT; 536 template <size_t _Jp, class... _Up> 537 friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&& 538 get(const tuple<_Up...>&&) _NOEXCEPT; 539 540public: 541 // [tuple.cnstr] 542 543 // tuple() constructors (including allocator_arg_t variants) 544 template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 545 template <class...> class _IsDefault = is_default_constructible, 546 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 547 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) tuple() 548 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) {} 549 550 template <class _Alloc, 551 template <class...> class _IsImpDefault = __is_implicitly_default_constructible, 552 template <class...> class _IsDefault = is_default_constructible, 553 __enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0> 554 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value) 555 tuple(allocator_arg_t, _Alloc const& __a) 556 : __base_(allocator_arg_t(), 557 __a, 558 __tuple_indices<>(), 559 __tuple_types<>(), 560 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 561 __tuple_types<_Tp...>()) {} 562 563 // tuple(const T&...) constructors (including allocator_arg_t variants) 564 template <template <class...> class _And = _And, 565 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 566 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 567 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) tuple(const _Tp&... __t) 568 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 569 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 570 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 571 typename __make_tuple_indices<0>::type(), 572 typename __make_tuple_types<tuple, 0>::type(), 573 __t...) {} 574 575 template <class _Alloc, 576 template <class...> class _And = _And, 577 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0> 578 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 579 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value) 580 tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t) 581 : __base_(allocator_arg_t(), 582 __a, 583 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 // tuple(U&& ...) constructors (including allocator_arg_t variants) 590 template <class... _Up> 591 struct _IsThisTuple : false_type {}; 592 template <class _Up> 593 struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {}; 594 595 template <class... _Up> 596 struct _EnableUTypesCtor 597 : _And< _BoolConstant<sizeof...(_Tp) >= 1>, 598 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 599 is_constructible<_Tp, _Up>... > {}; 600 601 template <class... _Up, 602 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 603 int> = 0> 604 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 605 tuple(_Up&&... __u) _NOEXCEPT_(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 606 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 607 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 608 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 609 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 610 std::forward<_Up>(__u)...) {} 611 612 template <class _Alloc, 613 class... _Up, 614 __enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value, 615 int> = 0> 616 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 617 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 618 : __base_(allocator_arg_t(), 619 __a, 620 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 // Copy and move constructors (including the allocator_arg_t variants) 627 tuple(const tuple&) = default; 628 tuple(tuple&&) = default; 629 630 template <class _Alloc, 631 template <class...> class _And = _And, 632 __enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0> 633 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 634 : __base_(allocator_arg_t(), __alloc, __t) {} 635 636 template <class _Alloc, 637 template <class...> class _And = _And, 638 __enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0> 639 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 640 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 641 642 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 643 644 template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void> 645 struct _EnableCtorFromUTypesTuple : false_type {}; 646 647 template <class _OtherTuple, class... _Up> 648 struct _EnableCtorFromUTypesTuple< 649 _OtherTuple, 650 tuple<_Up...>, 651 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 652 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> 653 : _And< 654 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor 655 // can work. Otherwise, is_constructible can trigger hard error in those cases 656 // https://godbolt.org/z/M94cGdKcE 657 _Not<is_same<_OtherTuple, const tuple&> >, 658 _Not<is_same<_OtherTuple, tuple&&> >, 659 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 660 _Lazy<_Or, 661 _BoolConstant<sizeof...(_Tp) != 1>, 662 // _Tp and _Up are 1-element packs - the pack expansions look 663 // weird to avoid tripping up the type traits in degenerate cases 664 _Lazy<_And, 665 _Not<is_same<_Tp, _Up> >..., 666 _Not<is_convertible<_OtherTuple, _Tp> >..., 667 _Not<is_constructible<_Tp, _OtherTuple> >... > > > {}; 668 669 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 670 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 671 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) tuple(const tuple<_Up...>& __t) 672 _NOEXCEPT_(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value) 673 : __base_(__t) {} 674 675 template <class... _Up, 676 class _Alloc, 677 __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0> 678 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 679 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value) 680 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 681 : __base_(allocator_arg_t(), __a, __t) {} 682 683# if _LIBCPP_STD_VER >= 23 684 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 685 686 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 687 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t) 688 : __base_(__t) {} 689 690 template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 691 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) 692 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) 693 : __base_(allocator_arg_t(), __alloc, __t) {} 694# endif // _LIBCPP_STD_VER >= 23 695 696 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 697 template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 698 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 699 tuple(tuple<_Up...>&& __t) _NOEXCEPT_(_And<is_nothrow_constructible<_Tp, _Up>...>::value) 700 : __base_(std::move(__t)) {} 701 702 template <class _Alloc, 703 class... _Up, 704 __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0> 705 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value) 706 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 707 : __base_(allocator_arg_t(), __a, std::move(__t)) {} 708 709# if _LIBCPP_STD_VER >= 23 710 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 711 712 template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 713 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 714 tuple(const tuple<_Up...>&& __t) 715 : __base_(std::move(__t)) {} 716 717 template <class _Alloc, 718 class... _Up, 719 enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 720 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value) 721 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 722 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 723# endif // _LIBCPP_STD_VER >= 23 724 725 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 726 727 template <template <class...> class _Pred, 728 class _Pair, 729 class _DecayedPair = __remove_cvref_t<_Pair>, 730 class _Tuple = tuple> 731 struct _CtorPredicateFromPair : false_type {}; 732 733 template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 734 struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 735 : _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {}; 736 737 template <class _Pair> 738 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {}; 739 740 template <class _Pair> 741 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {}; 742 743 template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple> 744 struct _BothImplicitlyConvertible : false_type {}; 745 746 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 747 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 748 : _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {}; 749 750 template <class _Up1, 751 class _Up2, 752 template <class...> class _And = _And, 753 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 754 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 755 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) tuple(const pair<_Up1, _Up2>& __p) 756 _NOEXCEPT_(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value) 757 : __base_(__p) {} 758 759 template <class _Alloc, 760 class _Up1, 761 class _Up2, 762 template <class...> class _And = _And, 763 __enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0> 764 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 765 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value) 766 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 767 : __base_(allocator_arg_t(), __a, __p) {} 768 769# if _LIBCPP_STD_VER >= 23 770 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 771 772 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 773 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 774 tuple(pair<_U1, _U2>& __p) 775 : __base_(__p) {} 776 777 template <class _Alloc, 778 class _U1, 779 class _U2, 780 enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 781 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 782 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) 783 : __base_(allocator_arg_t(), __alloc, __p) {} 784# endif 785 786 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 787 788 template <class _Up1, 789 class _Up2, 790 template <class...> class _And = _And, 791 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 792 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit( 793 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) tuple(pair<_Up1, _Up2>&& __p) 794 _NOEXCEPT_(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value) 795 : __base_(std::move(__p)) {} 796 797 template <class _Alloc, 798 class _Up1, 799 class _Up2, 800 template <class...> class _And = _And, 801 __enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0> 802 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit( 803 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value) 804 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 805 : __base_(allocator_arg_t(), __a, std::move(__p)) {} 806 807# if _LIBCPP_STD_VER >= 23 808 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 809 810 template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 811 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 812 tuple(const pair<_U1, _U2>&& __p) 813 : __base_(std::move(__p)) {} 814 815 template <class _Alloc, 816 class _U1, 817 class _U2, 818 enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 819 _LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 820 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 821 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 822# endif // _LIBCPP_STD_VER >= 23 823 824 // [tuple.assign] 825 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 826 operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 827 _NOEXCEPT_(_And<is_nothrow_copy_assignable<_Tp>...>::value) { 828 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 829 return *this; 830 } 831 832# if _LIBCPP_STD_VER >= 23 833 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const 834 requires(_And<is_copy_assignable<const _Tp>...>::value) 835 { 836 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 837 return *this; 838 } 839 840 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const 841 requires(_And<is_assignable<const _Tp&, _Tp>...>::value) 842 { 843 std::__memberwise_forward_assign( 844 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 845 return *this; 846 } 847# endif // _LIBCPP_STD_VER >= 23 848 849 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& 850 operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 851 _NOEXCEPT_(_And<is_nothrow_move_assignable<_Tp>...>::value) { 852 std::__memberwise_forward_assign( 853 *this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 854 return *this; 855 } 856 857 template < 858 class... _Up, 859 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value, 860 int> = 0> 861 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...> const& __tuple) 862 _NOEXCEPT_(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 863 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 864 return *this; 865 } 866 867 template <class... _Up, 868 __enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value, 869 int> = 0> 870 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...>&& __tuple) 871 _NOEXCEPT_(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 872 std::__memberwise_forward_assign( 873 *this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 874 return *this; 875 } 876 877# if _LIBCPP_STD_VER >= 23 878 template <class... _UTypes, 879 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 880 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 881 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const { 882 std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 883 return *this; 884 } 885 886 template <class... _UTypes, 887 enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 888 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 889 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const { 890 std::__memberwise_forward_assign( 891 *this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type()); 892 return *this; 893 } 894# endif // _LIBCPP_STD_VER >= 23 895 896 template <template <class...> class _Pred, 897 bool _Const, 898 class _Pair, 899 class _DecayedPair = __remove_cvref_t<_Pair>, 900 class _Tuple = tuple> 901 struct _AssignPredicateFromPair : false_type {}; 902 903 template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 904 struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > 905 : _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 906 _Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {}; 907 908 template <bool _Const, class _Pair> 909 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 910 911 template <bool _Const, class _Pair> 912 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 913 914# if _LIBCPP_STD_VER >= 23 915 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 916 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const 917 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 918 std::get<0>(*this) = __pair.first; 919 std::get<1>(*this) = __pair.second; 920 return *this; 921 } 922 923 template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 924 _LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const 925 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 926 std::get<0>(*this) = std::move(__pair.first); 927 std::get<1>(*this) = std::move(__pair.second); 928 return *this; 929 } 930# endif // _LIBCPP_STD_VER >= 23 931 932 template <class _Up1, 933 class _Up2, 934 __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0> 935 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2> const& __pair) 936 _NOEXCEPT_(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) { 937 std::get<0>(*this) = __pair.first; 938 std::get<1>(*this) = __pair.second; 939 return *this; 940 } 941 942 template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0> 943 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2>&& __pair) 944 _NOEXCEPT_(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) { 945 std::get<0>(*this) = std::forward<_Up1>(__pair.first); 946 std::get<1>(*this) = std::forward<_Up2>(__pair.second); 947 return *this; 948 } 949 950 // EXTENSION 951 template < 952 class _Up, 953 size_t _Np, 954 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0> 955 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np> const& __array) 956 _NOEXCEPT_(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) { 957 std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 958 return *this; 959 } 960 961 // EXTENSION 962 template <class _Up, 963 size_t _Np, 964 class = void, 965 __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0> 966 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np>&& __array) 967 _NOEXCEPT_(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) { 968 std::__memberwise_forward_assign( 969 *this, 970 std::move(__array), 971 __tuple_types<_If<true, _Up, _Tp>...>(), 972 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 973 return *this; 974 } 975 976 // [tuple.swap] 977 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple& __t) 978 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) { 979 __base_.swap(__t.__base_); 980 } 981 982# if _LIBCPP_STD_VER >= 23 983 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const 984 noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 985 __base_.swap(__t.__base_); 986 } 987# endif // _LIBCPP_STD_VER >= 23 988}; 989 990template <> 991class _LIBCPP_TEMPLATE_VIS tuple<> { 992public: 993 constexpr tuple() _NOEXCEPT = default; 994 template <class _Alloc> 995 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 996 template <class _Alloc> 997 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 998 template <class _Up> 999 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {} 1000 template <class _Alloc, class _Up> 1001 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1002 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {} 1003# if _LIBCPP_STD_VER >= 23 1004 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1005# endif 1006}; 1007 1008# if _LIBCPP_STD_VER >= 23 1009template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual> 1010 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1011struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1012 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1013}; 1014 1015template <class... _TTypes, class... _UTypes> 1016 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1017struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1018 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1019}; 1020# endif // _LIBCPP_STD_VER >= 23 1021 1022# if _LIBCPP_STD_VER >= 17 1023template <class... _Tp> 1024tuple(_Tp...) -> tuple<_Tp...>; 1025template <class _Tp1, class _Tp2> 1026tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1027template <class _Alloc, class... _Tp> 1028tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1029template <class _Alloc, class _Tp1, class _Tp2> 1030tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1031template <class _Alloc, class... _Tp> 1032tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1033# endif 1034 1035template <class... _Tp, __enable_if_t<__all<__is_swappable<_Tp>::value...>::value, int> = 0> 1036inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1037 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) { 1038 __t.swap(__u); 1039} 1040 1041# if _LIBCPP_STD_VER >= 23 1042template <class... _Tp> 1043_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1044swap(const tuple<_Tp...>& __lhs, 1045 const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1046 __lhs.swap(__rhs); 1047} 1048# endif 1049 1050// get 1051 1052template <size_t _Ip, class... _Tp> 1053inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type& 1054get(tuple<_Tp...>& __t) _NOEXCEPT { 1055 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1056 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1057} 1058 1059template <size_t _Ip, class... _Tp> 1060inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1061get(const tuple<_Tp...>& __t) _NOEXCEPT { 1062 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1063 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1064} 1065 1066template <size_t _Ip, class... _Tp> 1067inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1068get(tuple<_Tp...>&& __t) _NOEXCEPT { 1069 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1070 return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1071} 1072 1073template <size_t _Ip, class... _Tp> 1074inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1075get(const tuple<_Tp...>&& __t) _NOEXCEPT { 1076 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1077 return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1078} 1079 1080# if _LIBCPP_STD_VER >= 14 1081 1082template <class _T1, class... _Args> 1083inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept { 1084 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1085} 1086 1087template <class _T1, class... _Args> 1088inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept { 1089 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1090} 1091 1092template <class _T1, class... _Args> 1093inline _LIBCPP_HIDE_FROM_ABI constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept { 1094 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1095} 1096 1097template <class _T1, class... _Args> 1098inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept { 1099 return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup)); 1100} 1101 1102# endif 1103 1104// tie 1105 1106template <class... _Tp> 1107inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT { 1108 return tuple<_Tp&...>(__t...); 1109} 1110 1111template <class _Up> 1112struct __ignore_t { 1113 template <class _Tp> 1114 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const __ignore_t& operator=(_Tp&&) const { 1115 return *this; 1116 } 1117}; 1118 1119# if _LIBCPP_STD_VER >= 17 1120inline constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1121# else 1122namespace { 1123constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1124} // namespace 1125# endif 1126 1127template <class... _Tp> 1128inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<typename __unwrap_ref_decay<_Tp>::type...> 1129make_tuple(_Tp&&... __t) { 1130 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(std::forward<_Tp>(__t)...); 1131} 1132 1133template <class... _Tp> 1134inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT { 1135 return tuple<_Tp&&...>(std::forward<_Tp>(__t)...); 1136} 1137 1138template <size_t _Ip> 1139struct __tuple_equal { 1140 template <class _Tp, class _Up> 1141 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1142 return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y); 1143 } 1144}; 1145 1146template <> 1147struct __tuple_equal<0> { 1148 template <class _Tp, class _Up> 1149 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1150 return true; 1151 } 1152}; 1153 1154template <class... _Tp, class... _Up> 1155inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1156operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1157 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1158 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1159} 1160 1161# if _LIBCPP_STD_VER >= 20 1162 1163// operator<=> 1164 1165template <class... _Tp, class... _Up, size_t... _Is> 1166_LIBCPP_HIDE_FROM_ABI constexpr auto 1167__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1168 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1169 static_cast<void>( 1170 ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...)); 1171 return __result; 1172} 1173 1174template <class... _Tp, class... _Up> 1175 requires(sizeof...(_Tp) == sizeof...(_Up)) 1176_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1177operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1178 return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1179} 1180 1181# else // _LIBCPP_STD_VER >= 20 1182 1183template <class... _Tp, class... _Up> 1184inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1185operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1186 return !(__x == __y); 1187} 1188 1189template <size_t _Ip> 1190struct __tuple_less { 1191 template <class _Tp, class _Up> 1192 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) { 1193 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1194 if (std::get<__idx>(__x) < std::get<__idx>(__y)) 1195 return true; 1196 if (std::get<__idx>(__y) < std::get<__idx>(__x)) 1197 return false; 1198 return __tuple_less<_Ip - 1>()(__x, __y); 1199 } 1200}; 1201 1202template <> 1203struct __tuple_less<0> { 1204 template <class _Tp, class _Up> 1205 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) { 1206 return false; 1207 } 1208}; 1209 1210template <class... _Tp, class... _Up> 1211inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1212operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1213 static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1214 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1215} 1216 1217template <class... _Tp, class... _Up> 1218inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1219operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1220 return __y < __x; 1221} 1222 1223template <class... _Tp, class... _Up> 1224inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1225operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1226 return !(__x < __y); 1227} 1228 1229template <class... _Tp, class... _Up> 1230inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool 1231operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) { 1232 return !(__y < __x); 1233} 1234 1235# endif // _LIBCPP_STD_VER >= 20 1236 1237// tuple_cat 1238 1239template <class _Tp, class _Up> 1240struct __tuple_cat_type; 1241 1242template <class... _Ttypes, class... _Utypes> 1243struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > { 1244 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1245}; 1246 1247template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples> 1248struct __tuple_cat_return_1 {}; 1249 1250template <class... _Types, class _Tuple0> 1251struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> { 1252 using type _LIBCPP_NODEBUG = 1253 typename __tuple_cat_type< tuple<_Types...>, 1254 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type; 1255}; 1256 1257template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples> 1258struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1259 : public __tuple_cat_return_1< 1260 typename __tuple_cat_type< tuple<_Types...>, 1261 typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type, 1262 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value, 1263 _Tuple1, 1264 _Tuples...> {}; 1265 1266template <class... _Tuples> 1267struct __tuple_cat_return; 1268 1269template <class _Tuple0, class... _Tuples> 1270struct __tuple_cat_return<_Tuple0, _Tuples...> 1271 : public __tuple_cat_return_1<tuple<>, 1272 __tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value, 1273 _Tuple0, 1274 _Tuples...> {}; 1275 1276template <> 1277struct __tuple_cat_return<> { 1278 typedef _LIBCPP_NODEBUG tuple<> type; 1279}; 1280 1281inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); } 1282 1283template <class _Rp, class _Indices, class _Tuple0, class... _Tuples> 1284struct __tuple_cat_return_ref_imp; 1285 1286template <class... _Types, size_t... _I0, class _Tuple0> 1287struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> { 1288 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1289 typedef tuple<_Types..., __apply_cv_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type; 1290}; 1291 1292template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples> 1293struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...> 1294 : public __tuple_cat_return_ref_imp< 1295 tuple<_Types..., 1296 __apply_cv_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>, 1297 typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type, 1298 _Tuple1, 1299 _Tuples...> {}; 1300 1301template <class _Tuple0, class... _Tuples> 1302struct __tuple_cat_return_ref 1303 : public __tuple_cat_return_ref_imp< 1304 tuple<>, 1305 typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type, 1306 _Tuple0, 1307 _Tuples...> {}; 1308 1309template <class _Types, class _I0, class _J0> 1310struct __tuple_cat; 1311 1312template <class... _Types, size_t... _I0, size_t... _J0> 1313struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > { 1314 template <class _Tuple0> 1315 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1316 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1317 operator()(tuple<_Types...> __t, _Tuple0&& __t0) { 1318 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1319 return std::forward_as_tuple( 1320 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...); 1321 } 1322 1323 template <class _Tuple0, class _Tuple1, class... _Tuples> 1324 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 1325 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1326 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) { 1327 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1328 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1329 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple1> _T1; 1330 return __tuple_cat<tuple<_Types..., __apply_cv_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>, 1331 typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type, 1332 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1333 std::forward_as_tuple( 1334 std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...), 1335 std::forward<_Tuple1>(__t1), 1336 std::forward<_Tuples>(__tpls)...); 1337 } 1338}; 1339 1340template <class _Tuple0, class... _Tuples> 1341inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1342tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) { 1343 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0; 1344 return __tuple_cat<tuple<>, __tuple_indices<>, typename __make_tuple_indices<tuple_size<_T0>::value>::type>()( 1345 tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...); 1346} 1347 1348template <class... _Tp, class _Alloc> 1349struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {}; 1350 1351# if _LIBCPP_STD_VER >= 17 1352# define _LIBCPP_NOEXCEPT_RETURN(...) \ 1353 noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1354 1355// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting. 1356// clang-format off 1357template <class _Fn, class _Tuple, size_t... _Id> 1358inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) 1359__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>) 1360 _LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...)) 1361 1362template <class _Fn, class _Tuple> 1363inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t) 1364 _LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl( 1365 std::forward<_Fn>(__f), 1366 std::forward<_Tuple>(__t), 1367 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1368 1369#if _LIBCPP_STD_VER >= 20 1370template <class _Tp, class _Tuple, size_t... _Idx> 1371inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1372 noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))) 1373 requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> { 1374 return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); 1375} 1376#else 1377template <class _Tp, class _Tuple, size_t... _Idx> 1378inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>, 1379 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr) 1380 _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)) 1381#endif // _LIBCPP_STD_VER >= 20 1382 1383template <class _Tp, class _Tuple, 1384 class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void> 1385inline constexpr bool __can_make_from_tuple = false; 1386 1387template <class _Tp, class _Tuple, size_t... _Idx> 1388inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>, 1389 enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true; 1390 1391// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9, 1392// the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple 1393// SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl 1394// so that std::__make_from_tuple_impl will have the same advantages when used alone. 1395#if _LIBCPP_STD_VER >= 20 1396template <class _Tp, class _Tuple> 1397 requires __can_make_from_tuple<_Tp, _Tuple> // strengthen 1398#else 1399template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen 1400#endif // _LIBCPP_STD_VER >= 20 1401inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t) 1402 _LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>( 1403 std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})) 1404# undef _LIBCPP_NOEXCEPT_RETURN 1405 1406# endif // _LIBCPP_STD_VER >= 17 1407 1408#endif // !defined(_LIBCPP_CXX03_LANG) 1409 1410_LIBCPP_END_NAMESPACE_STD 1411 1412_LIBCPP_POP_MACROS 1413 1414// clang-format on 1415 1416#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1417# include <exception> 1418# include <iosfwd> 1419# include <new> 1420# include <type_traits> 1421# include <typeinfo> 1422# include <utility> 1423#endif 1424 1425#endif // _LIBCPP_TUPLE 1426