1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TUPLE 11#define _LIBCPP_TUPLE 12 13/* 14 tuple synopsis 15 16namespace std 17{ 18 19template <class... T> 20class tuple { 21public: 22 explicit(see-below) constexpr tuple(); 23 explicit(see-below) tuple(const T&...); // constexpr in C++14 24 template <class... U> 25 explicit(see-below) tuple(U&&...); // constexpr in C++14 26 tuple(const tuple&) = default; 27 tuple(tuple&&) = default; 28 29 template<class... UTypes> 30 constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23 31 template <class... U> 32 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14 33 template <class... U> 34 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14 35 template<class... UTypes> 36 constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23 37 38 template<class U1, class U2> 39 constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23 40 template <class U1, class U2> 41 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14 42 template <class U1, class U2> 43 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14 44 template<class U1, class U2> 45 constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23 46 47 // allocator-extended constructors 48 template <class Alloc> 49 tuple(allocator_arg_t, const Alloc& a); 50 template <class Alloc> 51 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20 52 template <class Alloc, class... U> 53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20 54 template <class Alloc> 55 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20 56 template <class Alloc> 57 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20 58 template<class Alloc, class... UTypes> 59 constexpr explicit(see-below) 60 tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23 61 template <class Alloc, class... U> 62 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20 63 template <class Alloc, class... U> 64 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20 65 template<class Alloc, class... UTypes> 66 constexpr explicit(see-below) 67 tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23 68 template<class Alloc, class U1, class U2> 69 constexpr explicit(see-below) 70 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23 71 template <class Alloc, class U1, class U2> 72 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20 73 template <class Alloc, class U1, class U2> 74 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20 75 template<class Alloc, class U1, class U2> 76 constexpr explicit(see-below) 77 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23 78 79 tuple& operator=(const tuple&); // constexpr in C++20 80 constexpr const tuple& operator=(const tuple&) const; // C++23 81 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20 82 constexpr const tuple& operator=(tuple&&) const; // C++23 83 template <class... U> 84 tuple& operator=(const tuple<U...>&); // constexpr in C++20 85 template<class... UTypes> 86 constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23 87 template <class... U> 88 tuple& operator=(tuple<U...>&&); // constexpr in C++20 89 template<class... UTypes> 90 constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23 91 template <class U1, class U2> 92 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20 93 template<class U1, class U2> 94 constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23 95 template <class U1, class U2> 96 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20 97 template<class U1, class U2> 98 constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23 99 100 template<class U, size_t N> 101 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION 102 template<class U, size_t N> 103 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION 104 105 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20 106 constexpr void swap(const tuple&) const noexcept(see-below); // C++23 107}; 108 109 110template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23 111 requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; } 112struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> { 113 using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; 114}; 115 116template<class... TTypes, class... UTypes> // since C++23 117 requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; } 118struct common_type<tuple<TTypes...>, tuple<UTypes...>> { 119 using type = tuple<common_type_t<TTypes, UTypes>...>; 120}; 121 122template <class ...T> 123tuple(T...) -> tuple<T...>; // since C++17 124template <class T1, class T2> 125tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17 126template <class Alloc, class ...T> 127tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17 128template <class Alloc, class T1, class T2> 129tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17 130template <class Alloc, class ...T> 131tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17 132 133inline constexpr unspecified ignore; 134 135template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 136template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 137template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 138template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 139 140// [tuple.apply], calling a function with a tuple of arguments: 141template <class F, class Tuple> 142 constexpr decltype(auto) apply(F&& f, Tuple&& t); // C++17 143template <class T, class Tuple> 144 constexpr T make_from_tuple(Tuple&& t); // C++17 145 146// 20.4.1.4, tuple helper classes: 147template <class T> struct tuple_size; // undefined 148template <class... T> struct tuple_size<tuple<T...>>; 149template <class T> 150 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 151template <size_t I, class T> struct tuple_element; // undefined 152template <size_t I, class... T> struct tuple_element<I, tuple<T...>>; 153template <size_t I, class T> 154 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 155 156// 20.4.1.5, element access: 157template <size_t I, class... T> 158 typename tuple_element<I, tuple<T...>>::type& 159 get(tuple<T...>&) noexcept; // constexpr in C++14 160template <size_t I, class... T> 161 const typename tuple_element<I, tuple<T...>>::type& 162 get(const tuple<T...>&) noexcept; // constexpr in C++14 163template <size_t I, class... T> 164 typename tuple_element<I, tuple<T...>>::type&& 165 get(tuple<T...>&&) noexcept; // constexpr in C++14 166template <size_t I, class... T> 167 const typename tuple_element<I, tuple<T...>>::type&& 168 get(const tuple<T...>&&) noexcept; // constexpr in C++14 169 170template <class T1, class... T> 171 constexpr T1& get(tuple<T...>&) noexcept; // C++14 172template <class T1, class... T> 173 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 174template <class T1, class... T> 175 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 176template <class T1, class... T> 177 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 178 179// 20.4.1.6, relational operators: 180template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 181template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 182template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 183template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 184template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 185template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20 186template<class... T, class... U> 187 constexpr common_comparison_category_t<synth-three-way-result<T, U>...> 188 operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20 189 190template <class... Types, class Alloc> 191 struct uses_allocator<tuple<Types...>, Alloc>; 192 193template <class... Types> 194 void 195 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 196 197template <class... Types> 198 constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23 199 200} // std 201 202*/ 203 204#include <__assert> // all public C++ headers provide the assertion handler 205#include <__compare/common_comparison_category.h> 206#include <__compare/synth_three_way.h> 207#include <__config> 208#include <__functional/unwrap_ref.h> 209#include <__memory/allocator_arg_t.h> 210#include <__memory/uses_allocator.h> 211#include <__tuple> 212#include <__utility/forward.h> 213#include <__utility/integer_sequence.h> 214#include <__utility/move.h> 215#include <__utility/pair.h> 216#include <__utility/piecewise_construct.h> 217#include <__utility/swap.h> 218#include <cstddef> 219#include <type_traits> 220#include <version> 221 222#ifndef _LIBCPP_REMOVE_TRANSITIVE_INCLUDES 223# include <exception> 224# include <iosfwd> 225# include <new> 226# include <typeinfo> 227# include <utility> 228#endif 229 230// standard-mandated includes 231#include <compare> 232 233#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 234# pragma GCC system_header 235#endif 236 237_LIBCPP_BEGIN_NAMESPACE_STD 238 239#ifndef _LIBCPP_CXX03_LANG 240 241 242// __tuple_leaf 243 244template <size_t _Ip, class _Hp, 245 bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value 246 > 247class __tuple_leaf; 248 249template <size_t _Ip, class _Hp, bool _Ep> 250inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 251void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 252 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) 253{ 254 swap(__x.get(), __y.get()); 255} 256 257template <size_t _Ip, class _Hp, bool _Ep> 258_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 259void swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x, const __tuple_leaf<_Ip, _Hp, _Ep>& __y) 260 _NOEXCEPT_(__is_nothrow_swappable<const _Hp>::value) { 261 swap(__x.get(), __y.get()); 262} 263 264template <size_t _Ip, class _Hp, bool> 265class __tuple_leaf 266{ 267 _Hp __value_; 268 269 template <class _Tp> 270 static constexpr bool __can_bind_reference() { 271#if __has_keyword(__reference_binds_to_temporary) 272 return !__reference_binds_to_temporary(_Hp, _Tp); 273#else 274 return true; 275#endif 276 } 277 278 _LIBCPP_CONSTEXPR_AFTER_CXX11 279 __tuple_leaf& operator=(const __tuple_leaf&); 280public: 281 _LIBCPP_INLINE_VISIBILITY constexpr __tuple_leaf() 282 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_() 283 {static_assert(!is_reference<_Hp>::value, 284 "Attempted to default construct a reference element in a tuple");} 285 286 template <class _Alloc> 287 _LIBCPP_INLINE_VISIBILITY constexpr 288 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) 289 : __value_() 290 {static_assert(!is_reference<_Hp>::value, 291 "Attempted to default construct a reference element in a tuple");} 292 293 template <class _Alloc> 294 _LIBCPP_INLINE_VISIBILITY constexpr 295 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 296 : __value_(allocator_arg_t(), __a) 297 {static_assert(!is_reference<_Hp>::value, 298 "Attempted to default construct a reference element in a tuple");} 299 300 template <class _Alloc> 301 _LIBCPP_INLINE_VISIBILITY constexpr 302 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 303 : __value_(__a) 304 {static_assert(!is_reference<_Hp>::value, 305 "Attempted to default construct a reference element in a tuple");} 306 307 template <class _Tp, 308 class = __enable_if_t< 309 _And< 310 _IsNotSame<__uncvref_t<_Tp>, __tuple_leaf>, 311 is_constructible<_Hp, _Tp> 312 >::value 313 > 314 > 315 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 316 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 317 : __value_(_VSTD::forward<_Tp>(__t)) 318 {static_assert(__can_bind_reference<_Tp&&>(), 319 "Attempted construction of reference element binds to a temporary whose lifetime has ended");} 320 321 template <class _Tp, class _Alloc> 322 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 323 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 324 : __value_(_VSTD::forward<_Tp>(__t)) 325 {static_assert(__can_bind_reference<_Tp&&>(), 326 "Attempted construction of reference element binds to a temporary whose lifetime has ended");} 327 328 template <class _Tp, class _Alloc> 329 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 330 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 331 : __value_(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) 332 {static_assert(!is_reference<_Hp>::value, 333 "Attempted to uses-allocator construct a reference element in a tuple");} 334 335 template <class _Tp, class _Alloc> 336 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 337 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 338 : __value_(_VSTD::forward<_Tp>(__t), __a) 339 {static_assert(!is_reference<_Hp>::value, 340 "Attempted to uses-allocator construct a reference element in a tuple");} 341 342 __tuple_leaf(const __tuple_leaf& __t) = default; 343 __tuple_leaf(__tuple_leaf&& __t) = default; 344 345 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 346 int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 347 { 348 _VSTD::swap(*this, __t); 349 return 0; 350 } 351 352 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 353 int swap(const __tuple_leaf& __t) const _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 354 _VSTD::swap(*this, __t); 355 return 0; 356 } 357 358 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return __value_;} 359 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return __value_;} 360}; 361 362template <size_t _Ip, class _Hp> 363class __tuple_leaf<_Ip, _Hp, true> 364 : private _Hp 365{ 366 _LIBCPP_CONSTEXPR_AFTER_CXX11 367 __tuple_leaf& operator=(const __tuple_leaf&); 368public: 369 _LIBCPP_INLINE_VISIBILITY constexpr __tuple_leaf() 370 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 371 372 template <class _Alloc> 373 _LIBCPP_INLINE_VISIBILITY constexpr 374 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 375 376 template <class _Alloc> 377 _LIBCPP_INLINE_VISIBILITY constexpr 378 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 379 : _Hp(allocator_arg_t(), __a) {} 380 381 template <class _Alloc> 382 _LIBCPP_INLINE_VISIBILITY constexpr 383 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 384 : _Hp(__a) {} 385 386 template <class _Tp, 387 class = __enable_if_t< 388 _And< 389 _IsNotSame<__uncvref_t<_Tp>, __tuple_leaf>, 390 is_constructible<_Hp, _Tp> 391 >::value 392 > 393 > 394 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 395 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 396 : _Hp(_VSTD::forward<_Tp>(__t)) {} 397 398 template <class _Tp, class _Alloc> 399 _LIBCPP_INLINE_VISIBILITY constexpr 400 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 401 : _Hp(_VSTD::forward<_Tp>(__t)) {} 402 403 template <class _Tp, class _Alloc> 404 _LIBCPP_INLINE_VISIBILITY constexpr 405 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 406 : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {} 407 408 template <class _Tp, class _Alloc> 409 _LIBCPP_INLINE_VISIBILITY constexpr 410 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 411 : _Hp(_VSTD::forward<_Tp>(__t), __a) {} 412 413 __tuple_leaf(__tuple_leaf const &) = default; 414 __tuple_leaf(__tuple_leaf &&) = default; 415 416 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 417 int 418 swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 419 { 420 _VSTD::swap(*this, __t); 421 return 0; 422 } 423 424 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 425 int swap(const __tuple_leaf& __rhs) const _NOEXCEPT_(__is_nothrow_swappable<const __tuple_leaf>::value) { 426 _VSTD::swap(*this, __rhs); 427 return 0; 428 } 429 430 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);} 431 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);} 432}; 433 434template <class ..._Tp> 435_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 436void __swallow(_Tp&&...) _NOEXCEPT {} 437 438template <class _Tp> 439struct __all_default_constructible; 440 441template <class ..._Tp> 442struct __all_default_constructible<__tuple_types<_Tp...>> 443 : __all<is_default_constructible<_Tp>::value...> 444{ }; 445 446// __tuple_impl 447 448template<class _Indx, class ..._Tp> struct __tuple_impl; 449 450template<size_t ..._Indx, class ..._Tp> 451struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 452 : public __tuple_leaf<_Indx, _Tp>... 453{ 454 _LIBCPP_INLINE_VISIBILITY 455 constexpr __tuple_impl() 456 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 457 458 template <size_t ..._Uf, class ..._Tf, 459 size_t ..._Ul, class ..._Tl, class ..._Up> 460 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 461 explicit 462 __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>, 463 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 464 _Up&&... __u) 465 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 466 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) : 467 __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))..., 468 __tuple_leaf<_Ul, _Tl>()... 469 {} 470 471 template <class _Alloc, size_t ..._Uf, class ..._Tf, 472 size_t ..._Ul, class ..._Tl, class ..._Up> 473 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 474 explicit 475 __tuple_impl(allocator_arg_t, const _Alloc& __a, 476 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, 477 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 478 _Up&&... __u) : 479 __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, 480 _VSTD::forward<_Up>(__u))..., 481 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... 482 {} 483 484 template <class _Tuple, 485 class = typename enable_if 486 < 487 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 488 >::type 489 > 490 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 491 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx, 492 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 493 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx, 494 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 495 {} 496 497 template <class _Alloc, class _Tuple, 498 class = typename enable_if 499 < 500 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 501 >::type 502 > 503 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 504 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 505 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx, 506 typename __make_tuple_types<_Tuple>::type>::type>(), __a, 507 _VSTD::forward<typename tuple_element<_Indx, 508 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 509 {} 510 511 __tuple_impl(const __tuple_impl&) = default; 512 __tuple_impl(__tuple_impl&&) = default; 513 514 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 515 void swap(__tuple_impl& __t) 516 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 517 { 518 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 519 } 520 521 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 522 void swap(const __tuple_impl& __t) const 523 _NOEXCEPT_(__all<__is_nothrow_swappable<const _Tp>::value...>::value) 524 { 525 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 526 } 527}; 528 529template<class _Dest, class _Source, size_t ..._Np> 530_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 531void __memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 532 _VSTD::__swallow(((_VSTD::get<_Np>(__dest) = _VSTD::get<_Np>(__source)), void(), 0)...); 533} 534 535template<class _Dest, class _Source, class ..._Up, size_t ..._Np> 536_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 537void __memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 538 _VSTD::__swallow((( 539 _VSTD::get<_Np>(__dest) = _VSTD::forward<_Up>(_VSTD::get<_Np>(__source)) 540 ), void(), 0)...); 541} 542 543template <class ..._Tp> 544class _LIBCPP_TEMPLATE_VIS tuple 545{ 546 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 547 548 _BaseT __base_; 549 550 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 551 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 552 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 553 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT; 554 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 555 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT; 556 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 557 const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT; 558public: 559 // [tuple.cnstr] 560 561 // tuple() constructors (including allocator_arg_t variants) 562 template <template<class...> class _IsImpDefault = __is_implicitly_default_constructible, __enable_if_t< 563 _And< 564 _IsImpDefault<_Tp>... // explicit check 565 >::value 566 , int> = 0> 567 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 568 tuple() 569 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) 570 { } 571 572 template <template<class...> class _IsImpDefault = __is_implicitly_default_constructible, 573 template<class...> class _IsDefault = is_default_constructible, __enable_if_t< 574 _And< 575 _IsDefault<_Tp>..., 576 _Not<_Lazy<_And, _IsImpDefault<_Tp>...> > // explicit check 577 >::value 578 , int> = 0> 579 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 580 explicit tuple() 581 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) 582 { } 583 584 template <class _Alloc, template<class...> class _IsImpDefault = __is_implicitly_default_constructible, __enable_if_t< 585 _And< 586 _IsImpDefault<_Tp>... // explicit check 587 >::value 588 , int> = 0> 589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 590 tuple(allocator_arg_t, _Alloc const& __a) 591 : __base_(allocator_arg_t(), __a, 592 __tuple_indices<>(), __tuple_types<>(), 593 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 594 __tuple_types<_Tp...>()) {} 595 596 template <class _Alloc, 597 template<class...> class _IsImpDefault = __is_implicitly_default_constructible, 598 template<class...> class _IsDefault = is_default_constructible, __enable_if_t< 599 _And< 600 _IsDefault<_Tp>..., 601 _Not<_Lazy<_And, _IsImpDefault<_Tp>...> > // explicit check 602 >::value 603 , int> = 0> 604 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 605 explicit tuple(allocator_arg_t, _Alloc const& __a) 606 : __base_(allocator_arg_t(), __a, 607 __tuple_indices<>(), __tuple_types<>(), 608 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 609 __tuple_types<_Tp...>()) {} 610 611 // tuple(const T&...) constructors (including allocator_arg_t variants) 612 template <template<class...> class _And = _And, __enable_if_t< 613 _And< 614 _BoolConstant<sizeof...(_Tp) >= 1>, 615 is_copy_constructible<_Tp>..., 616 is_convertible<const _Tp&, _Tp>... // explicit check 617 >::value 618 , int> = 0> 619 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 620 tuple(const _Tp& ... __t) 621 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 622 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 623 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 624 typename __make_tuple_indices<0>::type(), 625 typename __make_tuple_types<tuple, 0>::type(), 626 __t... 627 ) {} 628 629 template <template<class...> class _And = _And, __enable_if_t< 630 _And< 631 _BoolConstant<sizeof...(_Tp) >= 1>, 632 is_copy_constructible<_Tp>..., 633 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> > // explicit check 634 >::value 635 , int> = 0> 636 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 637 explicit tuple(const _Tp& ... __t) 638 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 639 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 640 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 641 typename __make_tuple_indices<0>::type(), 642 typename __make_tuple_types<tuple, 0>::type(), 643 __t... 644 ) {} 645 646 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 647 _And< 648 _BoolConstant<sizeof...(_Tp) >= 1>, 649 is_copy_constructible<_Tp>..., 650 is_convertible<const _Tp&, _Tp>... // explicit check 651 >::value 652 , int> = 0> 653 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 654 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 655 : __base_(allocator_arg_t(), __a, 656 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 657 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 658 typename __make_tuple_indices<0>::type(), 659 typename __make_tuple_types<tuple, 0>::type(), 660 __t... 661 ) {} 662 663 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 664 _And< 665 _BoolConstant<sizeof...(_Tp) >= 1>, 666 is_copy_constructible<_Tp>..., 667 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> > // explicit check 668 >::value 669 , int> = 0> 670 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 671 explicit tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 672 : __base_(allocator_arg_t(), __a, 673 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 674 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 675 typename __make_tuple_indices<0>::type(), 676 typename __make_tuple_types<tuple, 0>::type(), 677 __t... 678 ) {} 679 680 // tuple(U&& ...) constructors (including allocator_arg_t variants) 681 template <class ..._Up> struct _IsThisTuple : false_type { }; 682 template <class _Up> struct _IsThisTuple<_Up> : is_same<__uncvref_t<_Up>, tuple> { }; 683 684 template <class ..._Up> 685 struct _EnableUTypesCtor : _And< 686 _BoolConstant<sizeof...(_Tp) >= 1>, 687 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 688 is_constructible<_Tp, _Up>... 689 > { }; 690 691 template <class ..._Up, __enable_if_t< 692 _And< 693 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 694 _EnableUTypesCtor<_Up...>, 695 is_convertible<_Up, _Tp>... // explicit check 696 >::value 697 , int> = 0> 698 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 699 tuple(_Up&&... __u) 700 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 701 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 702 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 703 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 704 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 705 _VSTD::forward<_Up>(__u)...) {} 706 707 template <class ..._Up, __enable_if_t< 708 _And< 709 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 710 _EnableUTypesCtor<_Up...>, 711 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 712 >::value 713 , int> = 0> 714 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 715 explicit tuple(_Up&&... __u) 716 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 717 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 718 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 719 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 720 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 721 _VSTD::forward<_Up>(__u)...) {} 722 723 template <class _Alloc, class ..._Up, __enable_if_t< 724 _And< 725 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 726 _EnableUTypesCtor<_Up...>, 727 is_convertible<_Up, _Tp>... // explicit check 728 >::value 729 , int> = 0> 730 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 731 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 732 : __base_(allocator_arg_t(), __a, 733 typename __make_tuple_indices<sizeof...(_Up)>::type(), 734 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 735 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 736 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 737 _VSTD::forward<_Up>(__u)...) {} 738 739 template <class _Alloc, class ..._Up, __enable_if_t< 740 _And< 741 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 742 _EnableUTypesCtor<_Up...>, 743 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 744 >::value 745 , int> = 0> 746 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 747 explicit tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 748 : __base_(allocator_arg_t(), __a, 749 typename __make_tuple_indices<sizeof...(_Up)>::type(), 750 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 751 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 752 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 753 _VSTD::forward<_Up>(__u)...) {} 754 755 // Copy and move constructors (including the allocator_arg_t variants) 756 tuple(const tuple&) = default; 757 tuple(tuple&&) = default; 758 759 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 760 _And<is_copy_constructible<_Tp>...>::value 761 , int> = 0> 762 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 763 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 764 : __base_(allocator_arg_t(), __alloc, __t) 765 { } 766 767 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 768 _And<is_move_constructible<_Tp>...>::value 769 , int> = 0> 770 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 771 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 772 : __base_(allocator_arg_t(), __alloc, _VSTD::move(__t)) 773 { } 774 775 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 776 777 template <class _OtherTuple, class _DecayedOtherTuple = __uncvref_t<_OtherTuple>, class = void> 778 struct _EnableCtorFromUTypesTuple : false_type {}; 779 780 template <class _OtherTuple, class... _Up> 781 struct _EnableCtorFromUTypesTuple<_OtherTuple, tuple<_Up...>, 782 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 783 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> : _And< 784 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor can work. 785 // Otherwise, is_constructible can trigger hard error in those cases https://godbolt.org/z/M94cGdKcE 786 _Not<is_same<_OtherTuple, const tuple&> >, 787 _Not<is_same<_OtherTuple, tuple&&> >, 788 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 789 _Lazy<_Or, _BoolConstant<sizeof...(_Tp) != 1>, 790 // _Tp and _Up are 1-element packs - the pack expansions look 791 // weird to avoid tripping up the type traits in degenerate cases 792 _Lazy<_And, 793 _Not<is_same<_Tp, _Up> >..., 794 _Not<is_convertible<_OtherTuple, _Tp> >..., 795 _Not<is_constructible<_Tp, _OtherTuple> >... 796 > 797 > 798 > {}; 799 800 template <class ..._Up, __enable_if_t< 801 _And< 802 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 803 is_convertible<const _Up&, _Tp>... // explicit check 804 >::value 805 , int> = 0> 806 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 807 tuple(const tuple<_Up...>& __t) 808 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 809 : __base_(__t) 810 { } 811 812 template <class ..._Up, __enable_if_t< 813 _And< 814 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 815 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> > // explicit check 816 >::value 817 , int> = 0> 818 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 819 explicit tuple(const tuple<_Up...>& __t) 820 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 821 : __base_(__t) 822 { } 823 824 template <class ..._Up, class _Alloc, __enable_if_t< 825 _And< 826 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 827 is_convertible<const _Up&, _Tp>... // explicit check 828 >::value 829 , int> = 0> 830 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 831 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 832 : __base_(allocator_arg_t(), __a, __t) 833 { } 834 835 template <class ..._Up, class _Alloc, __enable_if_t< 836 _And< 837 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 838 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> > // explicit check 839 >::value 840 , int> = 0> 841 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 842 explicit tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 843 : __base_(allocator_arg_t(), __a, __t) 844 { } 845 846#if _LIBCPP_STD_VER > 20 847 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 848 849 template <class... _Up, enable_if_t< 850 _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 851 _LIBCPP_HIDE_FROM_ABI constexpr 852 explicit(!(is_convertible_v<_Up&, _Tp> && ...)) 853 tuple(tuple<_Up...>& __t) : __base_(__t) {} 854 855 template <class _Alloc, class... _Up, enable_if_t< 856 _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 857 _LIBCPP_HIDE_FROM_ABI constexpr 858 explicit(!(is_convertible_v<_Up&, _Tp> && ...)) 859 tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) : __base_(allocator_arg_t(), __alloc, __t) {} 860#endif // _LIBCPP_STD_VER > 20 861 862 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 863 864 template <class ..._Up, __enable_if_t< 865 _And< 866 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 867 is_convertible<_Up, _Tp>... // explicit check 868 >::value 869 , int> = 0> 870 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 871 tuple(tuple<_Up...>&& __t) 872 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 873 : __base_(_VSTD::move(__t)) 874 { } 875 876 template <class ..._Up, __enable_if_t< 877 _And< 878 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 879 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 880 >::value 881 , int> = 0> 882 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 883 explicit tuple(tuple<_Up...>&& __t) 884 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 885 : __base_(_VSTD::move(__t)) 886 { } 887 888 template <class _Alloc, class ..._Up, __enable_if_t< 889 _And< 890 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 891 is_convertible<_Up, _Tp>... // explicit check 892 >::value 893 , int> = 0> 894 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 895 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 896 : __base_(allocator_arg_t(), __a, _VSTD::move(__t)) 897 { } 898 899 template <class _Alloc, class ..._Up, __enable_if_t< 900 _And< 901 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 902 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 903 >::value 904 , int> = 0> 905 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 906 explicit tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 907 : __base_(allocator_arg_t(), __a, _VSTD::move(__t)) 908 { } 909 910#if _LIBCPP_STD_VER > 20 911 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 912 913 template <class... _Up, enable_if_t< 914 _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 915 _LIBCPP_HIDE_FROM_ABI constexpr 916 explicit(!(is_convertible_v<const _Up&&, _Tp> && ...)) 917 tuple(const tuple<_Up...>&& __t) : __base_(std::move(__t)) {} 918 919 template <class _Alloc, class... _Up, enable_if_t< 920 _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 921 _LIBCPP_HIDE_FROM_ABI constexpr 922 explicit(!(is_convertible_v<const _Up&&, _Tp> && ...)) 923 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 924 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 925#endif // _LIBCPP_STD_VER > 20 926 927 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 928 929 template <template <class...> class Pred, class _Pair, class _DecayedPair = __uncvref_t<_Pair>, class _Tuple = tuple> 930 struct _CtorPredicateFromPair : false_type{}; 931 932 template <template <class...> class Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 933 struct _CtorPredicateFromPair<Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : _And< 934 Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, 935 Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > 936 > {}; 937 938 template <class _Pair> 939 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair>{}; 940 941 template <class _Pair> 942 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair>{}; 943 944 template <class _Pair, class _DecayedPair = __uncvref_t<_Pair>, class _Tuple = tuple> 945 struct _BothImplicitlyConvertible : false_type{}; 946 947 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 948 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : _And< 949 is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, 950 is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> 951 > {}; 952 953 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 954 _And< 955 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 956 _BothImplicitlyConvertible<const pair<_Up1, _Up2>&> // explicit check 957 >::value 958 , int> = 0> 959 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 960 tuple(const pair<_Up1, _Up2>& __p) 961 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 962 : __base_(__p) 963 { } 964 965 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 966 _And< 967 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 968 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> > // explicit check 969 >::value 970 , int> = 0> 971 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 972 explicit tuple(const pair<_Up1, _Up2>& __p) 973 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 974 : __base_(__p) 975 { } 976 977 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 978 _And< 979 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 980 _BothImplicitlyConvertible<const pair<_Up1, _Up2>&> // explicit check 981 >::value 982 , int> = 0> 983 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 984 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 985 : __base_(allocator_arg_t(), __a, __p) 986 { } 987 988 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 989 _And< 990 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 991 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> > // explicit check 992 >::value 993 , int> = 0> 994 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 995 explicit tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 996 : __base_(allocator_arg_t(), __a, __p) 997 { } 998 999#if _LIBCPP_STD_VER > 20 1000 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 1001 1002 template <class _U1, class _U2, enable_if_t< 1003 _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 1004 _LIBCPP_HIDE_FROM_ABI constexpr 1005 explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 1006 tuple(pair<_U1, _U2>& __p) : __base_(__p) {} 1007 1008 template <class _Alloc, class _U1, class _U2, enable_if_t< 1009 _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 1010 _LIBCPP_HIDE_FROM_ABI constexpr 1011 explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 1012 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) : __base_(allocator_arg_t(), __alloc, __p) {} 1013#endif 1014 1015 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 1016 1017 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1018 _And< 1019 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1020 _BothImplicitlyConvertible<pair<_Up1, _Up2>&&> // explicit check 1021 >::value 1022 , int> = 0> 1023 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1024 tuple(pair<_Up1, _Up2>&& __p) 1025 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 1026 : __base_(_VSTD::move(__p)) 1027 { } 1028 1029 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1030 _And< 1031 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1032 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> > // explicit check 1033 >::value 1034 , int> = 0> 1035 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1036 explicit tuple(pair<_Up1, _Up2>&& __p) 1037 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 1038 : __base_(_VSTD::move(__p)) 1039 { } 1040 1041 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1042 _And< 1043 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1044 _BothImplicitlyConvertible<pair<_Up1, _Up2>&&> // explicit check 1045 >::value 1046 , int> = 0> 1047 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1048 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 1049 : __base_(allocator_arg_t(), __a, _VSTD::move(__p)) 1050 { } 1051 1052 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1053 _And< 1054 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1055 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> > // explicit check 1056 >::value 1057 , int> = 0> 1058 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1059 explicit tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 1060 : __base_(allocator_arg_t(), __a, _VSTD::move(__p)) 1061 { } 1062 1063#if _LIBCPP_STD_VER > 20 1064 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 1065 1066 template <class _U1, class _U2, enable_if_t< 1067 _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 1068 _LIBCPP_HIDE_FROM_ABI constexpr 1069 explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 1070 tuple(const pair<_U1, _U2>&& __p) : __base_(std::move(__p)) {} 1071 1072 template <class _Alloc, class _U1, class _U2, enable_if_t< 1073 _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 1074 _LIBCPP_HIDE_FROM_ABI constexpr 1075 explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 1076 tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 1077 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 1078#endif // _LIBCPP_STD_VER > 20 1079 1080 // [tuple.assign] 1081 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1082 tuple& operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 1083 _NOEXCEPT_((_And<is_nothrow_copy_assignable<_Tp>...>::value)) 1084 { 1085 _VSTD::__memberwise_copy_assign(*this, __tuple, 1086 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1087 return *this; 1088 } 1089 1090#if _LIBCPP_STD_VER > 20 1091 _LIBCPP_HIDE_FROM_ABI constexpr 1092 const tuple& operator=(tuple const& __tuple) const 1093 requires (_And<is_copy_assignable<const _Tp>...>::value) { 1094 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1095 return *this; 1096 } 1097 1098 _LIBCPP_HIDE_FROM_ABI constexpr 1099 const tuple& operator=(tuple&& __tuple) const 1100 requires (_And<is_assignable<const _Tp&, _Tp>...>::value) { 1101 std::__memberwise_forward_assign(*this, 1102 std::move(__tuple), 1103 __tuple_types<_Tp...>(), 1104 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1105 return *this; 1106 } 1107#endif // _LIBCPP_STD_VER > 20 1108 1109 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1110 tuple& operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 1111 _NOEXCEPT_((_And<is_nothrow_move_assignable<_Tp>...>::value)) 1112 { 1113 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 1114 __tuple_types<_Tp...>(), 1115 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1116 return *this; 1117 } 1118 1119 template<class... _Up, __enable_if_t< 1120 _And< 1121 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 1122 is_assignable<_Tp&, _Up const&>... 1123 >::value 1124 ,int> = 0> 1125 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1126 tuple& operator=(tuple<_Up...> const& __tuple) 1127 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 1128 { 1129 _VSTD::__memberwise_copy_assign(*this, __tuple, 1130 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1131 return *this; 1132 } 1133 1134 template<class... _Up, __enable_if_t< 1135 _And< 1136 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 1137 is_assignable<_Tp&, _Up>... 1138 >::value 1139 ,int> = 0> 1140 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1141 tuple& operator=(tuple<_Up...>&& __tuple) 1142 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1143 { 1144 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 1145 __tuple_types<_Up...>(), 1146 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1147 return *this; 1148 } 1149 1150 1151#if _LIBCPP_STD_VER > 20 1152 template <class... _UTypes, enable_if_t< 1153 _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 1154 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 1155 _LIBCPP_HIDE_FROM_ABI constexpr 1156 const tuple& operator=(const tuple<_UTypes...>& __u) const { 1157 std::__memberwise_copy_assign(*this, 1158 __u, 1159 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1160 return *this; 1161 } 1162 1163 template <class... _UTypes, enable_if_t< 1164 _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 1165 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 1166 _LIBCPP_HIDE_FROM_ABI constexpr 1167 const tuple& operator=(tuple<_UTypes...>&& __u) const { 1168 std::__memberwise_forward_assign(*this, 1169 __u, 1170 __tuple_types<_UTypes...>(), 1171 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1172 return *this; 1173 } 1174#endif // _LIBCPP_STD_VER > 20 1175 1176 template <template<class...> class Pred, bool _Const, 1177 class _Pair, class _DecayedPair = __uncvref_t<_Pair>, class _Tuple = tuple> 1178 struct _AssignPredicateFromPair : false_type {}; 1179 1180 template <template<class...> class Pred, bool _Const, 1181 class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 1182 struct _AssignPredicateFromPair<Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : 1183 _And<Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 1184 Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > 1185 > {}; 1186 1187 template <bool _Const, class _Pair> 1188 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 1189 1190 template <bool _Const, class _Pair> 1191 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 1192 1193#if _LIBCPP_STD_VER > 20 1194 template <class _U1, class _U2, enable_if_t< 1195 _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 1196 _LIBCPP_HIDE_FROM_ABI constexpr 1197 const tuple& operator=(const pair<_U1, _U2>& __pair) const 1198 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 1199 std::get<0>(*this) = __pair.first; 1200 std::get<1>(*this) = __pair.second; 1201 return *this; 1202 } 1203 1204 template <class _U1, class _U2, enable_if_t< 1205 _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 1206 _LIBCPP_HIDE_FROM_ABI constexpr 1207 const tuple& operator=(pair<_U1, _U2>&& __pair) const 1208 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 1209 std::get<0>(*this) = std::move(__pair.first); 1210 std::get<1>(*this) = std::move(__pair.second); 1211 return *this; 1212 } 1213#endif // _LIBCPP_STD_VER > 20 1214 1215 template<class _Up1, class _Up2, __enable_if_t< 1216 _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value 1217 ,int> = 0> 1218 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1219 tuple& operator=(pair<_Up1, _Up2> const& __pair) 1220 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value)) 1221 { 1222 _VSTD::get<0>(*this) = __pair.first; 1223 _VSTD::get<1>(*this) = __pair.second; 1224 return *this; 1225 } 1226 1227 template<class _Up1, class _Up2, __enable_if_t< 1228 _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value 1229 ,int> = 0> 1230 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1231 tuple& operator=(pair<_Up1, _Up2>&& __pair) 1232 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value)) 1233 { 1234 _VSTD::get<0>(*this) = _VSTD::forward<_Up1>(__pair.first); 1235 _VSTD::get<1>(*this) = _VSTD::forward<_Up2>(__pair.second); 1236 return *this; 1237 } 1238 1239 // EXTENSION 1240 template<class _Up, size_t _Np, class = __enable_if_t< 1241 _And< 1242 _BoolConstant<_Np == sizeof...(_Tp)>, 1243 is_assignable<_Tp&, _Up const&>... 1244 >::value 1245 > > 1246 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1247 tuple& operator=(array<_Up, _Np> const& __array) 1248 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 1249 { 1250 _VSTD::__memberwise_copy_assign(*this, __array, 1251 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1252 return *this; 1253 } 1254 1255 // EXTENSION 1256 template<class _Up, size_t _Np, class = void, class = __enable_if_t< 1257 _And< 1258 _BoolConstant<_Np == sizeof...(_Tp)>, 1259 is_assignable<_Tp&, _Up>... 1260 >::value 1261 > > 1262 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1263 tuple& operator=(array<_Up, _Np>&& __array) 1264 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1265 { 1266 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__array), 1267 __tuple_types<_If<true, _Up, _Tp>...>(), 1268 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1269 return *this; 1270 } 1271 1272 // [tuple.swap] 1273 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1274 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1275 {__base_.swap(__t.__base_);} 1276 1277#if _LIBCPP_STD_VER > 20 1278 _LIBCPP_HIDE_FROM_ABI constexpr 1279 void swap(const tuple& __t) const noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 1280 __base_.swap(__t.__base_); 1281 } 1282#endif // _LIBCPP_STD_VER > 20 1283}; 1284 1285template <> 1286class _LIBCPP_TEMPLATE_VIS tuple<> 1287{ 1288public: 1289 _LIBCPP_INLINE_VISIBILITY constexpr 1290 tuple() _NOEXCEPT = default; 1291 template <class _Alloc> 1292 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1293 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1294 template <class _Alloc> 1295 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1296 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1297 template <class _Up> 1298 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1299 tuple(array<_Up, 0>) _NOEXCEPT {} 1300 template <class _Alloc, class _Up> 1301 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1302 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1303 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1304 void swap(tuple&) _NOEXCEPT {} 1305#if _LIBCPP_STD_VER > 20 1306 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1307#endif 1308}; 1309 1310#if _LIBCPP_STD_VER > 20 1311template <class... _TTypes, class... _UTypes, template<class> class _TQual, template<class> class _UQual> 1312 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1313struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1314 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1315}; 1316 1317template <class... _TTypes, class... _UTypes> 1318 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1319struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1320 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1321}; 1322#endif // _LIBCPP_STD_VER > 20 1323 1324#if _LIBCPP_STD_VER > 14 1325template <class ..._Tp> 1326tuple(_Tp...) -> tuple<_Tp...>; 1327template <class _Tp1, class _Tp2> 1328tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1329template <class _Alloc, class ..._Tp> 1330tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1331template <class _Alloc, class _Tp1, class _Tp2> 1332tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1333template <class _Alloc, class ..._Tp> 1334tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1335#endif 1336 1337template <class ..._Tp> 1338inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1339typename enable_if 1340< 1341 __all<__is_swappable<_Tp>::value...>::value, 1342 void 1343>::type 1344swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1345 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1346 {__t.swap(__u);} 1347 1348#if _LIBCPP_STD_VER > 20 1349template <class... _Tp> 1350_LIBCPP_HIDE_FROM_ABI constexpr 1351enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1352swap(const tuple<_Tp...>& __lhs, const tuple<_Tp...>& __rhs) 1353 noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1354 __lhs.swap(__rhs); 1355} 1356#endif 1357 1358// get 1359 1360template <size_t _Ip, class ..._Tp> 1361inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1362typename tuple_element<_Ip, tuple<_Tp...> >::type& 1363get(tuple<_Tp...>& __t) _NOEXCEPT 1364{ 1365 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1366 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1367} 1368 1369template <size_t _Ip, class ..._Tp> 1370inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1371const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1372get(const tuple<_Tp...>& __t) _NOEXCEPT 1373{ 1374 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1375 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1376} 1377 1378template <size_t _Ip, class ..._Tp> 1379inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1380typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1381get(tuple<_Tp...>&& __t) _NOEXCEPT 1382{ 1383 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1384 return static_cast<type&&>( 1385 static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1386} 1387 1388template <size_t _Ip, class ..._Tp> 1389inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1390const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1391get(const tuple<_Tp...>&& __t) _NOEXCEPT 1392{ 1393 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1394 return static_cast<const type&&>( 1395 static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1396} 1397 1398#if _LIBCPP_STD_VER > 11 1399 1400namespace __find_detail { 1401 1402static constexpr size_t __not_found = static_cast<size_t>(-1); 1403static constexpr size_t __ambiguous = __not_found - 1; 1404 1405inline _LIBCPP_INLINE_VISIBILITY 1406constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { 1407 return !__matches ? __res : 1408 (__res == __not_found ? __curr_i : __ambiguous); 1409} 1410 1411template <size_t _Nx> 1412inline _LIBCPP_INLINE_VISIBILITY 1413constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { 1414 return __i == _Nx ? __not_found : 1415 __find_idx_return(__i, __find_idx(__i + 1, __matches), __matches[__i]); 1416} 1417 1418template <class _T1, class ..._Args> 1419struct __find_exactly_one_checked { 1420 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; 1421 static constexpr size_t value = __find_detail::__find_idx(0, __matches); 1422 static_assert(value != __not_found, "type not found in type list" ); 1423 static_assert(value != __ambiguous, "type occurs more than once in type list"); 1424}; 1425 1426template <class _T1> 1427struct __find_exactly_one_checked<_T1> { 1428 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); 1429}; 1430 1431} // namespace __find_detail 1432 1433template <typename _T1, typename... _Args> 1434struct __find_exactly_one_t 1435 : public __find_detail::__find_exactly_one_checked<_T1, _Args...> { 1436}; 1437 1438template <class _T1, class... _Args> 1439inline _LIBCPP_INLINE_VISIBILITY 1440constexpr _T1& get(tuple<_Args...>& __tup) noexcept 1441{ 1442 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1443} 1444 1445template <class _T1, class... _Args> 1446inline _LIBCPP_INLINE_VISIBILITY 1447constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept 1448{ 1449 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1450} 1451 1452template <class _T1, class... _Args> 1453inline _LIBCPP_INLINE_VISIBILITY 1454constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept 1455{ 1456 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1457} 1458 1459template <class _T1, class... _Args> 1460inline _LIBCPP_INLINE_VISIBILITY 1461constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept 1462{ 1463 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1464} 1465 1466#endif 1467 1468// tie 1469 1470template <class ..._Tp> 1471inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1472tuple<_Tp&...> 1473tie(_Tp&... __t) _NOEXCEPT 1474{ 1475 return tuple<_Tp&...>(__t...); 1476} 1477 1478template <class _Up> 1479struct __ignore_t 1480{ 1481 template <class _Tp> 1482 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1483 const __ignore_t& operator=(_Tp&&) const {return *this;} 1484}; 1485 1486namespace { 1487 constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1488} // namespace 1489 1490template <class... _Tp> 1491inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1492tuple<typename __unwrap_ref_decay<_Tp>::type...> 1493make_tuple(_Tp&&... __t) 1494{ 1495 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...); 1496} 1497 1498template <class... _Tp> 1499inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1500tuple<_Tp&&...> 1501forward_as_tuple(_Tp&&... __t) _NOEXCEPT 1502{ 1503 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...); 1504} 1505 1506template <size_t _Ip> 1507struct __tuple_equal 1508{ 1509 template <class _Tp, class _Up> 1510 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1511 bool operator()(const _Tp& __x, const _Up& __y) 1512 { 1513 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y); 1514 } 1515}; 1516 1517template <> 1518struct __tuple_equal<0> 1519{ 1520 template <class _Tp, class _Up> 1521 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1522 bool operator()(const _Tp&, const _Up&) 1523 { 1524 return true; 1525 } 1526}; 1527 1528template <class ..._Tp, class ..._Up> 1529inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1530bool 1531operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1532{ 1533 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1534 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1535} 1536 1537#if _LIBCPP_STD_VER > 17 1538 1539// operator<=> 1540 1541template <class ..._Tp, class ..._Up, size_t ..._Is> 1542_LIBCPP_HIDE_FROM_ABI constexpr 1543auto 1544__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1545 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1546 static_cast<void>(((__result = _VSTD::__synth_three_way(_VSTD::get<_Is>(__x), _VSTD::get<_Is>(__y)), __result != 0) || ...)); 1547 return __result; 1548} 1549 1550template <class ..._Tp, class ..._Up> 1551requires (sizeof...(_Tp) == sizeof...(_Up)) 1552_LIBCPP_HIDE_FROM_ABI constexpr 1553common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1554operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1555{ 1556 return _VSTD::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1557} 1558 1559#else // _LIBCPP_STD_VER > 17 1560 1561template <class ..._Tp, class ..._Up> 1562inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1563bool 1564operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1565{ 1566 return !(__x == __y); 1567} 1568 1569template <size_t _Ip> 1570struct __tuple_less 1571{ 1572 template <class _Tp, class _Up> 1573 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1574 bool operator()(const _Tp& __x, const _Up& __y) 1575 { 1576 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1577 if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y)) 1578 return true; 1579 if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x)) 1580 return false; 1581 return __tuple_less<_Ip-1>()(__x, __y); 1582 } 1583}; 1584 1585template <> 1586struct __tuple_less<0> 1587{ 1588 template <class _Tp, class _Up> 1589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1590 bool operator()(const _Tp&, const _Up&) 1591 { 1592 return false; 1593 } 1594}; 1595 1596template <class ..._Tp, class ..._Up> 1597inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1598bool 1599operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1600{ 1601 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1602 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1603} 1604 1605template <class ..._Tp, class ..._Up> 1606inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1607bool 1608operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1609{ 1610 return __y < __x; 1611} 1612 1613template <class ..._Tp, class ..._Up> 1614inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1615bool 1616operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1617{ 1618 return !(__x < __y); 1619} 1620 1621template <class ..._Tp, class ..._Up> 1622inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1623bool 1624operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1625{ 1626 return !(__y < __x); 1627} 1628 1629#endif // _LIBCPP_STD_VER > 17 1630 1631// tuple_cat 1632 1633template <class _Tp, class _Up> struct __tuple_cat_type; 1634 1635template <class ..._Ttypes, class ..._Utypes> 1636struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > 1637{ 1638 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1639}; 1640 1641template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples> 1642struct __tuple_cat_return_1 1643{ 1644}; 1645 1646template <class ..._Types, class _Tuple0> 1647struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> 1648{ 1649 using type _LIBCPP_NODEBUG = typename __tuple_cat_type< 1650 tuple<_Types...>, 1651 typename __make_tuple_types<__uncvref_t<_Tuple0> >::type 1652 >::type; 1653}; 1654 1655template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples> 1656struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1657 : public __tuple_cat_return_1< 1658 typename __tuple_cat_type< 1659 tuple<_Types...>, 1660 typename __make_tuple_types<__uncvref_t<_Tuple0> >::type 1661 >::type, 1662 __tuple_like<typename remove_reference<_Tuple1>::type>::value, 1663 _Tuple1, _Tuples...> 1664{ 1665}; 1666 1667template <class ..._Tuples> struct __tuple_cat_return; 1668 1669template <class _Tuple0, class ..._Tuples> 1670struct __tuple_cat_return<_Tuple0, _Tuples...> 1671 : public __tuple_cat_return_1<tuple<>, 1672 __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0, 1673 _Tuples...> 1674{ 1675}; 1676 1677template <> 1678struct __tuple_cat_return<> 1679{ 1680 typedef _LIBCPP_NODEBUG tuple<> type; 1681}; 1682 1683inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1684tuple<> 1685tuple_cat() 1686{ 1687 return tuple<>(); 1688} 1689 1690template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples> 1691struct __tuple_cat_return_ref_imp; 1692 1693template <class ..._Types, size_t ..._I0, class _Tuple0> 1694struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> 1695{ 1696 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0; 1697 typedef tuple<_Types..., typename __apply_cv<_Tuple0, 1698 typename tuple_element<_I0, _T0>::type>::type&&...> type; 1699}; 1700 1701template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples> 1702struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, 1703 _Tuple0, _Tuple1, _Tuples...> 1704 : public __tuple_cat_return_ref_imp< 1705 tuple<_Types..., typename __apply_cv<_Tuple0, 1706 typename tuple_element<_I0, 1707 typename remove_reference<_Tuple0>::type>::type>::type&&...>, 1708 typename __make_tuple_indices<tuple_size<typename 1709 remove_reference<_Tuple1>::type>::value>::type, 1710 _Tuple1, _Tuples...> 1711{ 1712}; 1713 1714template <class _Tuple0, class ..._Tuples> 1715struct __tuple_cat_return_ref 1716 : public __tuple_cat_return_ref_imp<tuple<>, 1717 typename __make_tuple_indices< 1718 tuple_size<typename remove_reference<_Tuple0>::type>::value 1719 >::type, _Tuple0, _Tuples...> 1720{ 1721}; 1722 1723template <class _Types, class _I0, class _J0> 1724struct __tuple_cat; 1725 1726template <class ..._Types, size_t ..._I0, size_t ..._J0> 1727struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > 1728{ 1729 template <class _Tuple0> 1730 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1731 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1732 operator()(tuple<_Types...> __t, _Tuple0&& __t0) 1733 { 1734 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1735 return _VSTD::forward_as_tuple( 1736 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1737 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...); 1738 } 1739 1740 template <class _Tuple0, class _Tuple1, class ..._Tuples> 1741 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1742 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1743 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls) 1744 { 1745 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1746 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0; 1747 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple1>::type _T1; 1748 return __tuple_cat< 1749 tuple<_Types..., 1750 typename __apply_cv<_Tuple0, typename tuple_element< 1751 _J0, _T0>::type>::type&&...>, 1752 typename __make_tuple_indices<sizeof...(_Types) + 1753 tuple_size<_T0>::value>::type, 1754 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1755 _VSTD::forward_as_tuple( 1756 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1757 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...), 1758 _VSTD::forward<_Tuple1>(__t1), _VSTD::forward<_Tuples>(__tpls)...); 1759 } 1760}; 1761 1762template <class _Tuple0, class... _Tuples> 1763inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1764typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1765tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) 1766{ 1767 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0; 1768 return __tuple_cat<tuple<>, __tuple_indices<>, 1769 typename __make_tuple_indices<tuple_size<_T0>::value>::type>() 1770 (tuple<>(), _VSTD::forward<_Tuple0>(__t0), 1771 _VSTD::forward<_Tuples>(__tpls)...); 1772} 1773 1774template <class ..._Tp, class _Alloc> 1775struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> 1776 : true_type {}; 1777 1778template <class _T1, class _T2> 1779template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2> 1780inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1781pair<_T1, _T2>::pair(piecewise_construct_t, 1782 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 1783 __tuple_indices<_I1...>, __tuple_indices<_I2...>) 1784 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...), 1785 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...) 1786{ 1787} 1788 1789#if _LIBCPP_STD_VER > 14 1790template <class _Tp> 1791inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 1792 1793#define _LIBCPP_NOEXCEPT_RETURN(...) noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1794 1795template <class _Fn, class _Tuple, size_t ..._Id> 1796inline _LIBCPP_INLINE_VISIBILITY 1797constexpr decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, 1798 __tuple_indices<_Id...>) 1799_LIBCPP_NOEXCEPT_RETURN( 1800 _VSTD::__invoke( 1801 _VSTD::forward<_Fn>(__f), 1802 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...) 1803) 1804 1805template <class _Fn, class _Tuple> 1806inline _LIBCPP_INLINE_VISIBILITY 1807constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t) 1808_LIBCPP_NOEXCEPT_RETURN( 1809 _VSTD::__apply_tuple_impl( 1810 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), 1811 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1812) 1813 1814template <class _Tp, class _Tuple, size_t... _Idx> 1815inline _LIBCPP_INLINE_VISIBILITY 1816constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1817_LIBCPP_NOEXCEPT_RETURN( 1818 _Tp(_VSTD::get<_Idx>(_VSTD::forward<_Tuple>(__t))...) 1819) 1820 1821template <class _Tp, class _Tuple> 1822inline _LIBCPP_INLINE_VISIBILITY 1823constexpr _Tp make_from_tuple(_Tuple&& __t) 1824_LIBCPP_NOEXCEPT_RETURN( 1825 _VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t), 1826 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1827) 1828 1829#undef _LIBCPP_NOEXCEPT_RETURN 1830 1831#endif // _LIBCPP_STD_VER > 14 1832 1833#endif // !defined(_LIBCPP_CXX03_LANG) 1834 1835_LIBCPP_END_NAMESPACE_STD 1836 1837#endif // _LIBCPP_TUPLE 1838