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 = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> 486 > 487 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 488 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx, 489 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 490 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx, 491 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 492 {} 493 494 template <class _Alloc, class _Tuple, 495 class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> 496 > 497 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 498 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 499 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx, 500 typename __make_tuple_types<_Tuple>::type>::type>(), __a, 501 _VSTD::forward<typename tuple_element<_Indx, 502 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 503 {} 504 505 __tuple_impl(const __tuple_impl&) = default; 506 __tuple_impl(__tuple_impl&&) = default; 507 508 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 509 void swap(__tuple_impl& __t) 510 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 511 { 512 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 513 } 514 515 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 516 void swap(const __tuple_impl& __t) const 517 _NOEXCEPT_(__all<__is_nothrow_swappable<const _Tp>::value...>::value) 518 { 519 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...); 520 } 521}; 522 523template<class _Dest, class _Source, size_t ..._Np> 524_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 525void __memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 526 _VSTD::__swallow(((_VSTD::get<_Np>(__dest) = _VSTD::get<_Np>(__source)), void(), 0)...); 527} 528 529template<class _Dest, class _Source, class ..._Up, size_t ..._Np> 530_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 531void __memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 532 _VSTD::__swallow((( 533 _VSTD::get<_Np>(__dest) = _VSTD::forward<_Up>(_VSTD::get<_Np>(__source)) 534 ), void(), 0)...); 535} 536 537template <class ..._Tp> 538class _LIBCPP_TEMPLATE_VIS tuple 539{ 540 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 541 542 _BaseT __base_; 543 544 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 545 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 546 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 547 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT; 548 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 549 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT; 550 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 551 const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT; 552public: 553 // [tuple.cnstr] 554 555 // tuple() constructors (including allocator_arg_t variants) 556 template <template<class...> class _IsImpDefault = __is_implicitly_default_constructible, __enable_if_t< 557 _And< 558 _IsImpDefault<_Tp>... // explicit check 559 >::value 560 , int> = 0> 561 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 562 tuple() 563 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) 564 { } 565 566 template <template<class...> class _IsImpDefault = __is_implicitly_default_constructible, 567 template<class...> class _IsDefault = is_default_constructible, __enable_if_t< 568 _And< 569 _IsDefault<_Tp>..., 570 _Not<_Lazy<_And, _IsImpDefault<_Tp>...> > // explicit check 571 >::value 572 , int> = 0> 573 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 574 explicit tuple() 575 _NOEXCEPT_(_And<is_nothrow_default_constructible<_Tp>...>::value) 576 { } 577 578 template <class _Alloc, template<class...> class _IsImpDefault = __is_implicitly_default_constructible, __enable_if_t< 579 _And< 580 _IsImpDefault<_Tp>... // explicit check 581 >::value 582 , int> = 0> 583 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 584 tuple(allocator_arg_t, _Alloc const& __a) 585 : __base_(allocator_arg_t(), __a, 586 __tuple_indices<>(), __tuple_types<>(), 587 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 588 __tuple_types<_Tp...>()) {} 589 590 template <class _Alloc, 591 template<class...> class _IsImpDefault = __is_implicitly_default_constructible, 592 template<class...> class _IsDefault = is_default_constructible, __enable_if_t< 593 _And< 594 _IsDefault<_Tp>..., 595 _Not<_Lazy<_And, _IsImpDefault<_Tp>...> > // explicit check 596 >::value 597 , int> = 0> 598 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 599 explicit tuple(allocator_arg_t, _Alloc const& __a) 600 : __base_(allocator_arg_t(), __a, 601 __tuple_indices<>(), __tuple_types<>(), 602 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 603 __tuple_types<_Tp...>()) {} 604 605 // tuple(const T&...) constructors (including allocator_arg_t variants) 606 template <template<class...> class _And = _And, __enable_if_t< 607 _And< 608 _BoolConstant<sizeof...(_Tp) >= 1>, 609 is_copy_constructible<_Tp>..., 610 is_convertible<const _Tp&, _Tp>... // explicit check 611 >::value 612 , int> = 0> 613 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 614 tuple(const _Tp& ... __t) 615 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 616 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 617 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 618 typename __make_tuple_indices<0>::type(), 619 typename __make_tuple_types<tuple, 0>::type(), 620 __t... 621 ) {} 622 623 template <template<class...> class _And = _And, __enable_if_t< 624 _And< 625 _BoolConstant<sizeof...(_Tp) >= 1>, 626 is_copy_constructible<_Tp>..., 627 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> > // explicit check 628 >::value 629 , int> = 0> 630 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 631 explicit tuple(const _Tp& ... __t) 632 _NOEXCEPT_(_And<is_nothrow_copy_constructible<_Tp>...>::value) 633 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 634 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 635 typename __make_tuple_indices<0>::type(), 636 typename __make_tuple_types<tuple, 0>::type(), 637 __t... 638 ) {} 639 640 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 641 _And< 642 _BoolConstant<sizeof...(_Tp) >= 1>, 643 is_copy_constructible<_Tp>..., 644 is_convertible<const _Tp&, _Tp>... // explicit check 645 >::value 646 , int> = 0> 647 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 648 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 649 : __base_(allocator_arg_t(), __a, 650 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 651 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 652 typename __make_tuple_indices<0>::type(), 653 typename __make_tuple_types<tuple, 0>::type(), 654 __t... 655 ) {} 656 657 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 658 _And< 659 _BoolConstant<sizeof...(_Tp) >= 1>, 660 is_copy_constructible<_Tp>..., 661 _Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> > // explicit check 662 >::value 663 , int> = 0> 664 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 665 explicit tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 666 : __base_(allocator_arg_t(), __a, 667 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 668 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 669 typename __make_tuple_indices<0>::type(), 670 typename __make_tuple_types<tuple, 0>::type(), 671 __t... 672 ) {} 673 674 // tuple(U&& ...) constructors (including allocator_arg_t variants) 675 template <class ..._Up> struct _IsThisTuple : false_type { }; 676 template <class _Up> struct _IsThisTuple<_Up> : is_same<__uncvref_t<_Up>, tuple> { }; 677 678 template <class ..._Up> 679 struct _EnableUTypesCtor : _And< 680 _BoolConstant<sizeof...(_Tp) >= 1>, 681 _Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors 682 is_constructible<_Tp, _Up>... 683 > { }; 684 685 template <class ..._Up, __enable_if_t< 686 _And< 687 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 688 _EnableUTypesCtor<_Up...>, 689 is_convertible<_Up, _Tp>... // explicit check 690 >::value 691 , int> = 0> 692 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 693 tuple(_Up&&... __u) 694 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 695 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 696 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 697 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 698 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 699 _VSTD::forward<_Up>(__u)...) {} 700 701 template <class ..._Up, __enable_if_t< 702 _And< 703 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 704 _EnableUTypesCtor<_Up...>, 705 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 706 >::value 707 , int> = 0> 708 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 709 explicit tuple(_Up&&... __u) 710 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 711 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 712 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 713 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 714 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 715 _VSTD::forward<_Up>(__u)...) {} 716 717 template <class _Alloc, class ..._Up, __enable_if_t< 718 _And< 719 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 720 _EnableUTypesCtor<_Up...>, 721 is_convertible<_Up, _Tp>... // explicit check 722 >::value 723 , int> = 0> 724 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 725 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 726 : __base_(allocator_arg_t(), __a, 727 typename __make_tuple_indices<sizeof...(_Up)>::type(), 728 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 729 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 730 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 731 _VSTD::forward<_Up>(__u)...) {} 732 733 template <class _Alloc, class ..._Up, __enable_if_t< 734 _And< 735 _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, 736 _EnableUTypesCtor<_Up...>, 737 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 738 >::value 739 , int> = 0> 740 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 741 explicit tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 742 : __base_(allocator_arg_t(), __a, 743 typename __make_tuple_indices<sizeof...(_Up)>::type(), 744 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 745 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 746 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 747 _VSTD::forward<_Up>(__u)...) {} 748 749 // Copy and move constructors (including the allocator_arg_t variants) 750 tuple(const tuple&) = default; 751 tuple(tuple&&) = default; 752 753 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 754 _And<is_copy_constructible<_Tp>...>::value 755 , int> = 0> 756 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 757 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t) 758 : __base_(allocator_arg_t(), __alloc, __t) 759 { } 760 761 template <class _Alloc, template<class...> class _And = _And, __enable_if_t< 762 _And<is_move_constructible<_Tp>...>::value 763 , int> = 0> 764 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 765 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t) 766 : __base_(allocator_arg_t(), __alloc, _VSTD::move(__t)) 767 { } 768 769 // tuple(const tuple<U...>&) constructors (including allocator_arg_t variants) 770 771 template <class _OtherTuple, class _DecayedOtherTuple = __uncvref_t<_OtherTuple>, class = void> 772 struct _EnableCtorFromUTypesTuple : false_type {}; 773 774 template <class _OtherTuple, class... _Up> 775 struct _EnableCtorFromUTypesTuple<_OtherTuple, tuple<_Up...>, 776 // the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below 777 __enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>> : _And< 778 // the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor can work. 779 // Otherwise, is_constructible can trigger hard error in those cases https://godbolt.org/z/M94cGdKcE 780 _Not<is_same<_OtherTuple, const tuple&> >, 781 _Not<is_same<_OtherTuple, tuple&&> >, 782 is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >..., 783 _Lazy<_Or, _BoolConstant<sizeof...(_Tp) != 1>, 784 // _Tp and _Up are 1-element packs - the pack expansions look 785 // weird to avoid tripping up the type traits in degenerate cases 786 _Lazy<_And, 787 _Not<is_same<_Tp, _Up> >..., 788 _Not<is_convertible<_OtherTuple, _Tp> >..., 789 _Not<is_constructible<_Tp, _OtherTuple> >... 790 > 791 > 792 > {}; 793 794 template <class ..._Up, __enable_if_t< 795 _And< 796 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 797 is_convertible<const _Up&, _Tp>... // explicit check 798 >::value 799 , int> = 0> 800 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 801 tuple(const tuple<_Up...>& __t) 802 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 803 : __base_(__t) 804 { } 805 806 template <class ..._Up, __enable_if_t< 807 _And< 808 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 809 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> > // explicit check 810 >::value 811 , int> = 0> 812 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 813 explicit tuple(const tuple<_Up...>& __t) 814 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)) 815 : __base_(__t) 816 { } 817 818 template <class ..._Up, class _Alloc, __enable_if_t< 819 _And< 820 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 821 is_convertible<const _Up&, _Tp>... // explicit check 822 >::value 823 , int> = 0> 824 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 825 tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 826 : __base_(allocator_arg_t(), __a, __t) 827 { } 828 829 template <class ..._Up, class _Alloc, __enable_if_t< 830 _And< 831 _EnableCtorFromUTypesTuple<const tuple<_Up...>&>, 832 _Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> > // explicit check 833 >::value 834 , int> = 0> 835 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 836 explicit tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t) 837 : __base_(allocator_arg_t(), __a, __t) 838 { } 839 840#if _LIBCPP_STD_VER > 20 841 // tuple(tuple<U...>&) constructors (including allocator_arg_t variants) 842 843 template <class... _Up, enable_if_t< 844 _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr> 845 _LIBCPP_HIDE_FROM_ABI constexpr 846 explicit(!(is_convertible_v<_Up&, _Tp> && ...)) 847 tuple(tuple<_Up...>& __t) : __base_(__t) {} 848 849 template <class _Alloc, 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(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t) : __base_(allocator_arg_t(), __alloc, __t) {} 854#endif // _LIBCPP_STD_VER > 20 855 856 // tuple(tuple<U...>&&) constructors (including allocator_arg_t variants) 857 858 template <class ..._Up, __enable_if_t< 859 _And< 860 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 861 is_convertible<_Up, _Tp>... // explicit check 862 >::value 863 , int> = 0> 864 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 865 tuple(tuple<_Up...>&& __t) 866 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 867 : __base_(_VSTD::move(__t)) 868 { } 869 870 template <class ..._Up, __enable_if_t< 871 _And< 872 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 873 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 874 >::value 875 , int> = 0> 876 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 877 explicit tuple(tuple<_Up...>&& __t) 878 _NOEXCEPT_((_And<is_nothrow_constructible<_Tp, _Up>...>::value)) 879 : __base_(_VSTD::move(__t)) 880 { } 881 882 template <class _Alloc, class ..._Up, __enable_if_t< 883 _And< 884 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 885 is_convertible<_Up, _Tp>... // explicit check 886 >::value 887 , int> = 0> 888 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 889 tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 890 : __base_(allocator_arg_t(), __a, _VSTD::move(__t)) 891 { } 892 893 template <class _Alloc, class ..._Up, __enable_if_t< 894 _And< 895 _EnableCtorFromUTypesTuple<tuple<_Up...>&&>, 896 _Not<_Lazy<_And, is_convertible<_Up, _Tp>...> > // explicit check 897 >::value 898 , int> = 0> 899 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 900 explicit tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t) 901 : __base_(allocator_arg_t(), __a, _VSTD::move(__t)) 902 { } 903 904#if _LIBCPP_STD_VER > 20 905 // tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants) 906 907 template <class... _Up, enable_if_t< 908 _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr> 909 _LIBCPP_HIDE_FROM_ABI constexpr 910 explicit(!(is_convertible_v<const _Up&&, _Tp> && ...)) 911 tuple(const tuple<_Up...>&& __t) : __base_(std::move(__t)) {} 912 913 template <class _Alloc, 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(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t) 918 : __base_(allocator_arg_t(), __alloc, std::move(__t)) {} 919#endif // _LIBCPP_STD_VER > 20 920 921 // tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants) 922 923 template <template <class...> class Pred, class _Pair, class _DecayedPair = __uncvref_t<_Pair>, class _Tuple = tuple> 924 struct _CtorPredicateFromPair : false_type{}; 925 926 template <template <class...> class Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 927 struct _CtorPredicateFromPair<Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : _And< 928 Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, 929 Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > 930 > {}; 931 932 template <class _Pair> 933 struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair>{}; 934 935 template <class _Pair> 936 struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair>{}; 937 938 template <class _Pair, class _DecayedPair = __uncvref_t<_Pair>, class _Tuple = tuple> 939 struct _BothImplicitlyConvertible : false_type{}; 940 941 template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 942 struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : _And< 943 is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, 944 is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> 945 > {}; 946 947 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 948 _And< 949 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 950 _BothImplicitlyConvertible<const pair<_Up1, _Up2>&> // explicit check 951 >::value 952 , int> = 0> 953 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 954 tuple(const pair<_Up1, _Up2>& __p) 955 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 956 : __base_(__p) 957 { } 958 959 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 960 _And< 961 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 962 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> > // explicit check 963 >::value 964 , int> = 0> 965 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 966 explicit tuple(const pair<_Up1, _Up2>& __p) 967 _NOEXCEPT_((_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)) 968 : __base_(__p) 969 { } 970 971 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 972 _And< 973 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 974 _BothImplicitlyConvertible<const pair<_Up1, _Up2>&> // explicit check 975 >::value 976 , int> = 0> 977 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 978 tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 979 : __base_(allocator_arg_t(), __a, __p) 980 { } 981 982 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 983 _And< 984 _EnableCtorFromPair<const pair<_Up1, _Up2>&>, 985 _Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> > // explicit check 986 >::value 987 , int> = 0> 988 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 989 explicit tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p) 990 : __base_(allocator_arg_t(), __a, __p) 991 { } 992 993#if _LIBCPP_STD_VER > 20 994 // tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants) 995 996 template <class _U1, class _U2, enable_if_t< 997 _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr> 998 _LIBCPP_HIDE_FROM_ABI constexpr 999 explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 1000 tuple(pair<_U1, _U2>& __p) : __base_(__p) {} 1001 1002 template <class _Alloc, class _U1, class _U2, enable_if_t< 1003 _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr> 1004 _LIBCPP_HIDE_FROM_ABI constexpr 1005 explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value) 1006 tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p) : __base_(allocator_arg_t(), __alloc, __p) {} 1007#endif 1008 1009 // tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants) 1010 1011 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1012 _And< 1013 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1014 _BothImplicitlyConvertible<pair<_Up1, _Up2>&&> // explicit check 1015 >::value 1016 , int> = 0> 1017 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1018 tuple(pair<_Up1, _Up2>&& __p) 1019 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 1020 : __base_(_VSTD::move(__p)) 1021 { } 1022 1023 template <class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1024 _And< 1025 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1026 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> > // explicit check 1027 >::value 1028 , int> = 0> 1029 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1030 explicit tuple(pair<_Up1, _Up2>&& __p) 1031 _NOEXCEPT_((_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)) 1032 : __base_(_VSTD::move(__p)) 1033 { } 1034 1035 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1036 _And< 1037 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1038 _BothImplicitlyConvertible<pair<_Up1, _Up2>&&> // explicit check 1039 >::value 1040 , int> = 0> 1041 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1042 tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 1043 : __base_(allocator_arg_t(), __a, _VSTD::move(__p)) 1044 { } 1045 1046 template <class _Alloc, class _Up1, class _Up2, template<class...> class _And = _And, __enable_if_t< 1047 _And< 1048 _EnableCtorFromPair<pair<_Up1, _Up2>&&>, 1049 _Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> > // explicit check 1050 >::value 1051 , int> = 0> 1052 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1053 explicit tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p) 1054 : __base_(allocator_arg_t(), __a, _VSTD::move(__p)) 1055 { } 1056 1057#if _LIBCPP_STD_VER > 20 1058 // tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants) 1059 1060 template <class _U1, class _U2, enable_if_t< 1061 _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr> 1062 _LIBCPP_HIDE_FROM_ABI constexpr 1063 explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value) 1064 tuple(const pair<_U1, _U2>&& __p) : __base_(std::move(__p)) {} 1065 1066 template <class _Alloc, 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(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p) 1071 : __base_(allocator_arg_t(), __alloc, std::move(__p)) {} 1072#endif // _LIBCPP_STD_VER > 20 1073 1074 // [tuple.assign] 1075 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1076 tuple& operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 1077 _NOEXCEPT_((_And<is_nothrow_copy_assignable<_Tp>...>::value)) 1078 { 1079 _VSTD::__memberwise_copy_assign(*this, __tuple, 1080 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1081 return *this; 1082 } 1083 1084#if _LIBCPP_STD_VER > 20 1085 _LIBCPP_HIDE_FROM_ABI constexpr 1086 const tuple& operator=(tuple const& __tuple) const 1087 requires (_And<is_copy_assignable<const _Tp>...>::value) { 1088 std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1089 return *this; 1090 } 1091 1092 _LIBCPP_HIDE_FROM_ABI constexpr 1093 const tuple& operator=(tuple&& __tuple) const 1094 requires (_And<is_assignable<const _Tp&, _Tp>...>::value) { 1095 std::__memberwise_forward_assign(*this, 1096 std::move(__tuple), 1097 __tuple_types<_Tp...>(), 1098 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1099 return *this; 1100 } 1101#endif // _LIBCPP_STD_VER > 20 1102 1103 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1104 tuple& operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 1105 _NOEXCEPT_((_And<is_nothrow_move_assignable<_Tp>...>::value)) 1106 { 1107 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 1108 __tuple_types<_Tp...>(), 1109 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1110 return *this; 1111 } 1112 1113 template<class... _Up, __enable_if_t< 1114 _And< 1115 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 1116 is_assignable<_Tp&, _Up const&>... 1117 >::value 1118 ,int> = 0> 1119 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1120 tuple& operator=(tuple<_Up...> const& __tuple) 1121 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 1122 { 1123 _VSTD::__memberwise_copy_assign(*this, __tuple, 1124 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1125 return *this; 1126 } 1127 1128 template<class... _Up, __enable_if_t< 1129 _And< 1130 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 1131 is_assignable<_Tp&, _Up>... 1132 >::value 1133 ,int> = 0> 1134 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1135 tuple& operator=(tuple<_Up...>&& __tuple) 1136 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1137 { 1138 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 1139 __tuple_types<_Up...>(), 1140 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1141 return *this; 1142 } 1143 1144 1145#if _LIBCPP_STD_VER > 20 1146 template <class... _UTypes, enable_if_t< 1147 _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 1148 is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr> 1149 _LIBCPP_HIDE_FROM_ABI constexpr 1150 const tuple& operator=(const tuple<_UTypes...>& __u) const { 1151 std::__memberwise_copy_assign(*this, 1152 __u, 1153 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1154 return *this; 1155 } 1156 1157 template <class... _UTypes, enable_if_t< 1158 _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>, 1159 is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr> 1160 _LIBCPP_HIDE_FROM_ABI constexpr 1161 const tuple& operator=(tuple<_UTypes...>&& __u) const { 1162 std::__memberwise_forward_assign(*this, 1163 __u, 1164 __tuple_types<_UTypes...>(), 1165 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1166 return *this; 1167 } 1168#endif // _LIBCPP_STD_VER > 20 1169 1170 template <template<class...> class Pred, bool _Const, 1171 class _Pair, class _DecayedPair = __uncvref_t<_Pair>, class _Tuple = tuple> 1172 struct _AssignPredicateFromPair : false_type {}; 1173 1174 template <template<class...> class Pred, bool _Const, 1175 class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2> 1176 struct _AssignPredicateFromPair<Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> > : 1177 _And<Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >, 1178 Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > 1179 > {}; 1180 1181 template <bool _Const, class _Pair> 1182 struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {}; 1183 1184 template <bool _Const, class _Pair> 1185 struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {}; 1186 1187#if _LIBCPP_STD_VER > 20 1188 template <class _U1, class _U2, enable_if_t< 1189 _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr> 1190 _LIBCPP_HIDE_FROM_ABI constexpr 1191 const tuple& operator=(const pair<_U1, _U2>& __pair) const 1192 noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) { 1193 std::get<0>(*this) = __pair.first; 1194 std::get<1>(*this) = __pair.second; 1195 return *this; 1196 } 1197 1198 template <class _U1, class _U2, enable_if_t< 1199 _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr> 1200 _LIBCPP_HIDE_FROM_ABI constexpr 1201 const tuple& operator=(pair<_U1, _U2>&& __pair) const 1202 noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) { 1203 std::get<0>(*this) = std::move(__pair.first); 1204 std::get<1>(*this) = std::move(__pair.second); 1205 return *this; 1206 } 1207#endif // _LIBCPP_STD_VER > 20 1208 1209 template<class _Up1, class _Up2, __enable_if_t< 1210 _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value 1211 ,int> = 0> 1212 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1213 tuple& operator=(pair<_Up1, _Up2> const& __pair) 1214 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value)) 1215 { 1216 _VSTD::get<0>(*this) = __pair.first; 1217 _VSTD::get<1>(*this) = __pair.second; 1218 return *this; 1219 } 1220 1221 template<class _Up1, class _Up2, __enable_if_t< 1222 _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value 1223 ,int> = 0> 1224 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1225 tuple& operator=(pair<_Up1, _Up2>&& __pair) 1226 _NOEXCEPT_((_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value)) 1227 { 1228 _VSTD::get<0>(*this) = _VSTD::forward<_Up1>(__pair.first); 1229 _VSTD::get<1>(*this) = _VSTD::forward<_Up2>(__pair.second); 1230 return *this; 1231 } 1232 1233 // EXTENSION 1234 template<class _Up, size_t _Np, class = __enable_if_t< 1235 _And< 1236 _BoolConstant<_Np == sizeof...(_Tp)>, 1237 is_assignable<_Tp&, _Up const&>... 1238 >::value 1239 > > 1240 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1241 tuple& operator=(array<_Up, _Np> const& __array) 1242 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 1243 { 1244 _VSTD::__memberwise_copy_assign(*this, __array, 1245 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1246 return *this; 1247 } 1248 1249 // EXTENSION 1250 template<class _Up, size_t _Np, class = void, class = __enable_if_t< 1251 _And< 1252 _BoolConstant<_Np == sizeof...(_Tp)>, 1253 is_assignable<_Tp&, _Up>... 1254 >::value 1255 > > 1256 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1257 tuple& operator=(array<_Up, _Np>&& __array) 1258 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1259 { 1260 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__array), 1261 __tuple_types<_If<true, _Up, _Tp>...>(), 1262 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1263 return *this; 1264 } 1265 1266 // [tuple.swap] 1267 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1268 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1269 {__base_.swap(__t.__base_);} 1270 1271#if _LIBCPP_STD_VER > 20 1272 _LIBCPP_HIDE_FROM_ABI constexpr 1273 void swap(const tuple& __t) const noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) { 1274 __base_.swap(__t.__base_); 1275 } 1276#endif // _LIBCPP_STD_VER > 20 1277}; 1278 1279template <> 1280class _LIBCPP_TEMPLATE_VIS tuple<> 1281{ 1282public: 1283 _LIBCPP_INLINE_VISIBILITY constexpr 1284 tuple() _NOEXCEPT = default; 1285 template <class _Alloc> 1286 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1287 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1288 template <class _Alloc> 1289 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1290 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1291 template <class _Up> 1292 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1293 tuple(array<_Up, 0>) _NOEXCEPT {} 1294 template <class _Alloc, class _Up> 1295 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1296 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1297 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1298 void swap(tuple&) _NOEXCEPT {} 1299#if _LIBCPP_STD_VER > 20 1300 _LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {} 1301#endif 1302}; 1303 1304#if _LIBCPP_STD_VER > 20 1305template <class... _TTypes, class... _UTypes, template<class> class _TQual, template<class> class _UQual> 1306 requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; } 1307struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> { 1308 using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; 1309}; 1310 1311template <class... _TTypes, class... _UTypes> 1312 requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; } 1313struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> { 1314 using type = tuple<common_type_t<_TTypes, _UTypes>...>; 1315}; 1316#endif // _LIBCPP_STD_VER > 20 1317 1318#if _LIBCPP_STD_VER > 14 1319template <class ..._Tp> 1320tuple(_Tp...) -> tuple<_Tp...>; 1321template <class _Tp1, class _Tp2> 1322tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1323template <class _Alloc, class ..._Tp> 1324tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1325template <class _Alloc, class _Tp1, class _Tp2> 1326tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1327template <class _Alloc, class ..._Tp> 1328tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1329#endif 1330 1331template <class ..._Tp> 1332inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1333__enable_if_t<__all<__is_swappable<_Tp>::value...>::value, void> 1334swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1335 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1336 {__t.swap(__u);} 1337 1338#if _LIBCPP_STD_VER > 20 1339template <class... _Tp> 1340_LIBCPP_HIDE_FROM_ABI constexpr 1341enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void> 1342swap(const tuple<_Tp...>& __lhs, const tuple<_Tp...>& __rhs) 1343 noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) { 1344 __lhs.swap(__rhs); 1345} 1346#endif 1347 1348// get 1349 1350template <size_t _Ip, class ..._Tp> 1351inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1352typename tuple_element<_Ip, tuple<_Tp...> >::type& 1353get(tuple<_Tp...>& __t) _NOEXCEPT 1354{ 1355 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1356 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1357} 1358 1359template <size_t _Ip, class ..._Tp> 1360inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1361const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1362get(const tuple<_Tp...>& __t) _NOEXCEPT 1363{ 1364 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1365 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1366} 1367 1368template <size_t _Ip, class ..._Tp> 1369inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1370typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1371get(tuple<_Tp...>&& __t) _NOEXCEPT 1372{ 1373 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1374 return static_cast<type&&>( 1375 static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1376} 1377 1378template <size_t _Ip, class ..._Tp> 1379inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1380const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1381get(const tuple<_Tp...>&& __t) _NOEXCEPT 1382{ 1383 typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1384 return static_cast<const type&&>( 1385 static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1386} 1387 1388#if _LIBCPP_STD_VER > 11 1389 1390namespace __find_detail { 1391 1392static constexpr size_t __not_found = static_cast<size_t>(-1); 1393static constexpr size_t __ambiguous = __not_found - 1; 1394 1395inline _LIBCPP_INLINE_VISIBILITY 1396constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { 1397 return !__matches ? __res : 1398 (__res == __not_found ? __curr_i : __ambiguous); 1399} 1400 1401template <size_t _Nx> 1402inline _LIBCPP_INLINE_VISIBILITY 1403constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { 1404 return __i == _Nx ? __not_found : 1405 __find_idx_return(__i, __find_idx(__i + 1, __matches), __matches[__i]); 1406} 1407 1408template <class _T1, class ..._Args> 1409struct __find_exactly_one_checked { 1410 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; 1411 static constexpr size_t value = __find_detail::__find_idx(0, __matches); 1412 static_assert(value != __not_found, "type not found in type list" ); 1413 static_assert(value != __ambiguous, "type occurs more than once in type list"); 1414}; 1415 1416template <class _T1> 1417struct __find_exactly_one_checked<_T1> { 1418 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); 1419}; 1420 1421} // namespace __find_detail 1422 1423template <typename _T1, typename... _Args> 1424struct __find_exactly_one_t 1425 : public __find_detail::__find_exactly_one_checked<_T1, _Args...> { 1426}; 1427 1428template <class _T1, class... _Args> 1429inline _LIBCPP_INLINE_VISIBILITY 1430constexpr _T1& get(tuple<_Args...>& __tup) noexcept 1431{ 1432 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1433} 1434 1435template <class _T1, class... _Args> 1436inline _LIBCPP_INLINE_VISIBILITY 1437constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept 1438{ 1439 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1440} 1441 1442template <class _T1, class... _Args> 1443inline _LIBCPP_INLINE_VISIBILITY 1444constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept 1445{ 1446 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1447} 1448 1449template <class _T1, class... _Args> 1450inline _LIBCPP_INLINE_VISIBILITY 1451constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept 1452{ 1453 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1454} 1455 1456#endif 1457 1458// tie 1459 1460template <class ..._Tp> 1461inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1462tuple<_Tp&...> 1463tie(_Tp&... __t) _NOEXCEPT 1464{ 1465 return tuple<_Tp&...>(__t...); 1466} 1467 1468template <class _Up> 1469struct __ignore_t 1470{ 1471 template <class _Tp> 1472 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1473 const __ignore_t& operator=(_Tp&&) const {return *this;} 1474}; 1475 1476namespace { 1477 constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1478} // namespace 1479 1480template <class... _Tp> 1481inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1482tuple<typename __unwrap_ref_decay<_Tp>::type...> 1483make_tuple(_Tp&&... __t) 1484{ 1485 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...); 1486} 1487 1488template <class... _Tp> 1489inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1490tuple<_Tp&&...> 1491forward_as_tuple(_Tp&&... __t) _NOEXCEPT 1492{ 1493 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...); 1494} 1495 1496template <size_t _Ip> 1497struct __tuple_equal 1498{ 1499 template <class _Tp, class _Up> 1500 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1501 bool operator()(const _Tp& __x, const _Up& __y) 1502 { 1503 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y); 1504 } 1505}; 1506 1507template <> 1508struct __tuple_equal<0> 1509{ 1510 template <class _Tp, class _Up> 1511 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1512 bool operator()(const _Tp&, const _Up&) 1513 { 1514 return true; 1515 } 1516}; 1517 1518template <class ..._Tp, class ..._Up> 1519inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1520bool 1521operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1522{ 1523 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1524 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1525} 1526 1527#if _LIBCPP_STD_VER > 17 1528 1529// operator<=> 1530 1531template <class ..._Tp, class ..._Up, size_t ..._Is> 1532_LIBCPP_HIDE_FROM_ABI constexpr 1533auto 1534__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) { 1535 common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal; 1536 static_cast<void>(((__result = _VSTD::__synth_three_way(_VSTD::get<_Is>(__x), _VSTD::get<_Is>(__y)), __result != 0) || ...)); 1537 return __result; 1538} 1539 1540template <class ..._Tp, class ..._Up> 1541requires (sizeof...(_Tp) == sizeof...(_Up)) 1542_LIBCPP_HIDE_FROM_ABI constexpr 1543common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> 1544operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1545{ 1546 return _VSTD::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{}); 1547} 1548 1549#else // _LIBCPP_STD_VER > 17 1550 1551template <class ..._Tp, class ..._Up> 1552inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1553bool 1554operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1555{ 1556 return !(__x == __y); 1557} 1558 1559template <size_t _Ip> 1560struct __tuple_less 1561{ 1562 template <class _Tp, class _Up> 1563 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1564 bool operator()(const _Tp& __x, const _Up& __y) 1565 { 1566 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1567 if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y)) 1568 return true; 1569 if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x)) 1570 return false; 1571 return __tuple_less<_Ip-1>()(__x, __y); 1572 } 1573}; 1574 1575template <> 1576struct __tuple_less<0> 1577{ 1578 template <class _Tp, class _Up> 1579 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1580 bool operator()(const _Tp&, const _Up&) 1581 { 1582 return false; 1583 } 1584}; 1585 1586template <class ..._Tp, class ..._Up> 1587inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1588bool 1589operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1590{ 1591 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1592 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1593} 1594 1595template <class ..._Tp, class ..._Up> 1596inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1597bool 1598operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1599{ 1600 return __y < __x; 1601} 1602 1603template <class ..._Tp, class ..._Up> 1604inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1605bool 1606operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1607{ 1608 return !(__x < __y); 1609} 1610 1611template <class ..._Tp, class ..._Up> 1612inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1613bool 1614operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1615{ 1616 return !(__y < __x); 1617} 1618 1619#endif // _LIBCPP_STD_VER > 17 1620 1621// tuple_cat 1622 1623template <class _Tp, class _Up> struct __tuple_cat_type; 1624 1625template <class ..._Ttypes, class ..._Utypes> 1626struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > 1627{ 1628 typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type; 1629}; 1630 1631template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples> 1632struct __tuple_cat_return_1 1633{ 1634}; 1635 1636template <class ..._Types, class _Tuple0> 1637struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> 1638{ 1639 using type _LIBCPP_NODEBUG = typename __tuple_cat_type< 1640 tuple<_Types...>, 1641 typename __make_tuple_types<__uncvref_t<_Tuple0> >::type 1642 >::type; 1643}; 1644 1645template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples> 1646struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1647 : public __tuple_cat_return_1< 1648 typename __tuple_cat_type< 1649 tuple<_Types...>, 1650 typename __make_tuple_types<__uncvref_t<_Tuple0> >::type 1651 >::type, 1652 __tuple_like<typename remove_reference<_Tuple1>::type>::value, 1653 _Tuple1, _Tuples...> 1654{ 1655}; 1656 1657template <class ..._Tuples> struct __tuple_cat_return; 1658 1659template <class _Tuple0, class ..._Tuples> 1660struct __tuple_cat_return<_Tuple0, _Tuples...> 1661 : public __tuple_cat_return_1<tuple<>, 1662 __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0, 1663 _Tuples...> 1664{ 1665}; 1666 1667template <> 1668struct __tuple_cat_return<> 1669{ 1670 typedef _LIBCPP_NODEBUG tuple<> type; 1671}; 1672 1673inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1674tuple<> 1675tuple_cat() 1676{ 1677 return tuple<>(); 1678} 1679 1680template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples> 1681struct __tuple_cat_return_ref_imp; 1682 1683template <class ..._Types, size_t ..._I0, class _Tuple0> 1684struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> 1685{ 1686 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0; 1687 typedef tuple<_Types..., typename __apply_cv<_Tuple0, 1688 typename tuple_element<_I0, _T0>::type>::type&&...> type; 1689}; 1690 1691template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples> 1692struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, 1693 _Tuple0, _Tuple1, _Tuples...> 1694 : public __tuple_cat_return_ref_imp< 1695 tuple<_Types..., typename __apply_cv<_Tuple0, 1696 typename tuple_element<_I0, 1697 typename remove_reference<_Tuple0>::type>::type>::type&&...>, 1698 typename __make_tuple_indices<tuple_size<typename 1699 remove_reference<_Tuple1>::type>::value>::type, 1700 _Tuple1, _Tuples...> 1701{ 1702}; 1703 1704template <class _Tuple0, class ..._Tuples> 1705struct __tuple_cat_return_ref 1706 : public __tuple_cat_return_ref_imp<tuple<>, 1707 typename __make_tuple_indices< 1708 tuple_size<typename remove_reference<_Tuple0>::type>::value 1709 >::type, _Tuple0, _Tuples...> 1710{ 1711}; 1712 1713template <class _Types, class _I0, class _J0> 1714struct __tuple_cat; 1715 1716template <class ..._Types, size_t ..._I0, size_t ..._J0> 1717struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > 1718{ 1719 template <class _Tuple0> 1720 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1721 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1722 operator()(tuple<_Types...> __t, _Tuple0&& __t0) 1723 { 1724 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1725 return _VSTD::forward_as_tuple( 1726 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1727 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...); 1728 } 1729 1730 template <class _Tuple0, class _Tuple1, class ..._Tuples> 1731 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1732 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1733 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls) 1734 { 1735 (void)__t; // avoid unused parameter warning on GCC when _I0 is empty 1736 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0; 1737 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple1>::type _T1; 1738 return __tuple_cat< 1739 tuple<_Types..., 1740 typename __apply_cv<_Tuple0, typename tuple_element< 1741 _J0, _T0>::type>::type&&...>, 1742 typename __make_tuple_indices<sizeof...(_Types) + 1743 tuple_size<_T0>::value>::type, 1744 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1745 _VSTD::forward_as_tuple( 1746 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1747 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...), 1748 _VSTD::forward<_Tuple1>(__t1), _VSTD::forward<_Tuples>(__tpls)...); 1749 } 1750}; 1751 1752template <class _Tuple0, class... _Tuples> 1753inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1754typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1755tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) 1756{ 1757 typedef _LIBCPP_NODEBUG typename remove_reference<_Tuple0>::type _T0; 1758 return __tuple_cat<tuple<>, __tuple_indices<>, 1759 typename __make_tuple_indices<tuple_size<_T0>::value>::type>() 1760 (tuple<>(), _VSTD::forward<_Tuple0>(__t0), 1761 _VSTD::forward<_Tuples>(__tpls)...); 1762} 1763 1764template <class ..._Tp, class _Alloc> 1765struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> 1766 : true_type {}; 1767 1768template <class _T1, class _T2> 1769template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2> 1770inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1771pair<_T1, _T2>::pair(piecewise_construct_t, 1772 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 1773 __tuple_indices<_I1...>, __tuple_indices<_I2...>) 1774 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...), 1775 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...) 1776{ 1777} 1778 1779#if _LIBCPP_STD_VER > 14 1780template <class _Tp> 1781inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 1782 1783#define _LIBCPP_NOEXCEPT_RETURN(...) noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1784 1785template <class _Fn, class _Tuple, size_t ..._Id> 1786inline _LIBCPP_INLINE_VISIBILITY 1787constexpr decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, 1788 __tuple_indices<_Id...>) 1789_LIBCPP_NOEXCEPT_RETURN( 1790 _VSTD::__invoke( 1791 _VSTD::forward<_Fn>(__f), 1792 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...) 1793) 1794 1795template <class _Fn, class _Tuple> 1796inline _LIBCPP_INLINE_VISIBILITY 1797constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t) 1798_LIBCPP_NOEXCEPT_RETURN( 1799 _VSTD::__apply_tuple_impl( 1800 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), 1801 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1802) 1803 1804template <class _Tp, class _Tuple, size_t... _Idx> 1805inline _LIBCPP_INLINE_VISIBILITY 1806constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1807_LIBCPP_NOEXCEPT_RETURN( 1808 _Tp(_VSTD::get<_Idx>(_VSTD::forward<_Tuple>(__t))...) 1809) 1810 1811template <class _Tp, class _Tuple> 1812inline _LIBCPP_INLINE_VISIBILITY 1813constexpr _Tp make_from_tuple(_Tuple&& __t) 1814_LIBCPP_NOEXCEPT_RETURN( 1815 _VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t), 1816 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1817) 1818 1819#undef _LIBCPP_NOEXCEPT_RETURN 1820 1821#endif // _LIBCPP_STD_VER > 14 1822 1823#endif // !defined(_LIBCPP_CXX03_LANG) 1824 1825_LIBCPP_END_NAMESPACE_STD 1826 1827#endif // _LIBCPP_TUPLE 1828