1// -*- C++ -*- 2//===--------------------------- tuple ------------------------------------===// 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 template <class... U> 29 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14 30 template <class... U> 31 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14 32 template <class U1, class U2> 33 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14 34 template <class U1, class U2> 35 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14 36 37 // allocator-extended constructors 38 template <class Alloc> 39 tuple(allocator_arg_t, const Alloc& a); 40 template <class Alloc> 41 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20 42 template <class Alloc, class... U> 43 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20 44 template <class Alloc> 45 tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20 46 template <class Alloc> 47 tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20 48 template <class Alloc, class... U> 49 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20 50 template <class Alloc, class... U> 51 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20 52 template <class Alloc, class U1, class U2> 53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20 54 template <class Alloc, class U1, class U2> 55 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20 56 57 tuple& operator=(const tuple&); // constexpr in C++20 58 tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20 59 template <class... U> 60 tuple& operator=(const tuple<U...>&); // constexpr in C++20 61 template <class... U> 62 tuple& operator=(tuple<U...>&&); // constexpr in C++20 63 template <class U1, class U2> 64 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20 65 template <class U1, class U2> 66 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20 67 68 template<class U, size_t N> 69 tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION 70 template<class U, size_t N> 71 tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION 72 73 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20 74}; 75 76template <class ...T> 77tuple(T...) -> tuple<T...>; // since C++17 78template <class T1, class T2> 79tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17 80template <class Alloc, class ...T> 81tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17 82template <class Alloc, class T1, class T2> 83tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17 84template <class Alloc, class ...T> 85tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17 86 87inline constexpr unspecified ignore; 88 89template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 90template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 91template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 92template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 93 94// [tuple.apply], calling a function with a tuple of arguments: 95template <class F, class Tuple> 96 constexpr decltype(auto) apply(F&& f, Tuple&& t); // C++17 97template <class T, class Tuple> 98 constexpr T make_from_tuple(Tuple&& t); // C++17 99 100// 20.4.1.4, tuple helper classes: 101template <class T> struct tuple_size; // undefined 102template <class... T> struct tuple_size<tuple<T...>>; 103template <class T> 104 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 105template <size_t I, class T> struct tuple_element; // undefined 106template <size_t I, class... T> struct tuple_element<I, tuple<T...>>; 107template <size_t I, class T> 108 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 109 110// 20.4.1.5, element access: 111template <size_t I, class... T> 112 typename tuple_element<I, tuple<T...>>::type& 113 get(tuple<T...>&) noexcept; // constexpr in C++14 114template <size_t I, class... T> 115 const typename tuple_element<I, tuple<T...>>::type& 116 get(const tuple<T...>&) noexcept; // constexpr in C++14 117template <size_t I, class... T> 118 typename tuple_element<I, tuple<T...>>::type&& 119 get(tuple<T...>&&) noexcept; // constexpr in C++14 120template <size_t I, class... T> 121 const typename tuple_element<I, tuple<T...>>::type&& 122 get(const tuple<T...>&&) noexcept; // constexpr in C++14 123 124template <class T1, class... T> 125 constexpr T1& get(tuple<T...>&) noexcept; // C++14 126template <class T1, class... T> 127 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 128template <class T1, class... T> 129 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 130template <class T1, class... T> 131 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 132 133// 20.4.1.6, relational operators: 134template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 135template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 136template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 137template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 138template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 139template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 140 141template <class... Types, class Alloc> 142 struct uses_allocator<tuple<Types...>, Alloc>; 143 144template <class... Types> 145 void 146 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 147 148} // std 149 150*/ 151 152#include <__config> 153#include <__tuple> 154#include <cstddef> 155#include <type_traits> 156#include <__functional_base> 157#include <utility> 158#include <version> 159 160#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 161#pragma GCC system_header 162#endif 163 164_LIBCPP_BEGIN_NAMESPACE_STD 165 166#ifndef _LIBCPP_CXX03_LANG 167 168 169// __tuple_leaf 170 171template <size_t _Ip, class _Hp, 172 bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value 173 > 174class __tuple_leaf; 175 176template <size_t _Ip, class _Hp, bool _Ep> 177inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 178void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 179 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) 180{ 181 swap(__x.get(), __y.get()); 182} 183 184template <size_t _Ip, class _Hp, bool> 185class __tuple_leaf 186{ 187 _Hp __value_; 188 189 template <class _Tp> 190 static constexpr bool __can_bind_reference() { 191#if __has_keyword(__reference_binds_to_temporary) 192 return !__reference_binds_to_temporary(_Hp, _Tp); 193#else 194 return true; 195#endif 196 } 197 198 _LIBCPP_CONSTEXPR_AFTER_CXX11 199 __tuple_leaf& operator=(const __tuple_leaf&); 200public: 201 _LIBCPP_INLINE_VISIBILITY constexpr __tuple_leaf() 202 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_() 203 {static_assert(!is_reference<_Hp>::value, 204 "Attempted to default construct a reference element in a tuple");} 205 206 template <class _Alloc> 207 _LIBCPP_INLINE_VISIBILITY constexpr 208 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) 209 : __value_() 210 {static_assert(!is_reference<_Hp>::value, 211 "Attempted to default construct a reference element in a tuple");} 212 213 template <class _Alloc> 214 _LIBCPP_INLINE_VISIBILITY constexpr 215 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 216 : __value_(allocator_arg_t(), __a) 217 {static_assert(!is_reference<_Hp>::value, 218 "Attempted to default construct a reference element in a tuple");} 219 220 template <class _Alloc> 221 _LIBCPP_INLINE_VISIBILITY constexpr 222 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 223 : __value_(__a) 224 {static_assert(!is_reference<_Hp>::value, 225 "Attempted to default construct a reference element in a tuple");} 226 227 template <class _Tp, 228 class = _EnableIf< 229 _And< 230 _IsNotSame<__uncvref_t<_Tp>, __tuple_leaf>, 231 is_constructible<_Hp, _Tp> 232 >::value 233 > 234 > 235 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 236 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 237 : __value_(_VSTD::forward<_Tp>(__t)) 238 {static_assert(__can_bind_reference<_Tp&&>(), 239 "Attempted construction of reference element binds to a temporary whose lifetime has ended");} 240 241 template <class _Tp, class _Alloc> 242 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 243 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 244 : __value_(_VSTD::forward<_Tp>(__t)) 245 {static_assert(__can_bind_reference<_Tp&&>(), 246 "Attempted construction of reference element binds to a temporary whose lifetime has ended");} 247 248 template <class _Tp, class _Alloc> 249 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 250 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 251 : __value_(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) 252 {static_assert(!is_reference<_Hp>::value, 253 "Attempted to uses-allocator construct a reference element in a tuple");} 254 255 template <class _Tp, class _Alloc> 256 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 257 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 258 : __value_(_VSTD::forward<_Tp>(__t), __a) 259 {static_assert(!is_reference<_Hp>::value, 260 "Attempted to uses-allocator construct a reference element in a tuple");} 261 262 __tuple_leaf(const __tuple_leaf& __t) = default; 263 __tuple_leaf(__tuple_leaf&& __t) = default; 264 265 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 266 int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 267 { 268 _VSTD::swap(*this, __t); 269 return 0; 270 } 271 272 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return __value_;} 273 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return __value_;} 274}; 275 276template <size_t _Ip, class _Hp> 277class __tuple_leaf<_Ip, _Hp, true> 278 : private _Hp 279{ 280 _LIBCPP_CONSTEXPR_AFTER_CXX11 281 __tuple_leaf& operator=(const __tuple_leaf&); 282public: 283 _LIBCPP_INLINE_VISIBILITY constexpr __tuple_leaf() 284 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 285 286 template <class _Alloc> 287 _LIBCPP_INLINE_VISIBILITY constexpr 288 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 289 290 template <class _Alloc> 291 _LIBCPP_INLINE_VISIBILITY constexpr 292 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 293 : _Hp(allocator_arg_t(), __a) {} 294 295 template <class _Alloc> 296 _LIBCPP_INLINE_VISIBILITY constexpr 297 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 298 : _Hp(__a) {} 299 300 template <class _Tp, 301 class = _EnableIf< 302 _And< 303 _IsNotSame<__uncvref_t<_Tp>, __tuple_leaf>, 304 is_constructible<_Hp, _Tp> 305 >::value 306 > 307 > 308 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 309 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 310 : _Hp(_VSTD::forward<_Tp>(__t)) {} 311 312 template <class _Tp, class _Alloc> 313 _LIBCPP_INLINE_VISIBILITY constexpr 314 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 315 : _Hp(_VSTD::forward<_Tp>(__t)) {} 316 317 template <class _Tp, class _Alloc> 318 _LIBCPP_INLINE_VISIBILITY constexpr 319 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 320 : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {} 321 322 template <class _Tp, class _Alloc> 323 _LIBCPP_INLINE_VISIBILITY constexpr 324 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 325 : _Hp(_VSTD::forward<_Tp>(__t), __a) {} 326 327 __tuple_leaf(__tuple_leaf const &) = default; 328 __tuple_leaf(__tuple_leaf &&) = default; 329 330 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 331 int 332 swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 333 { 334 _VSTD::swap(*this, __t); 335 return 0; 336 } 337 338 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);} 339 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);} 340}; 341 342template <class ..._Tp> 343_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 344void __swallow(_Tp&&...) _NOEXCEPT {} 345 346template <class _Tp> 347struct __all_default_constructible; 348 349template <class ..._Tp> 350struct __all_default_constructible<__tuple_types<_Tp...>> 351 : __all<is_default_constructible<_Tp>::value...> 352{ }; 353 354// __tuple_impl 355 356template<class _Indx, class ..._Tp> struct __tuple_impl; 357 358template<size_t ..._Indx, class ..._Tp> 359struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 360 : public __tuple_leaf<_Indx, _Tp>... 361{ 362 _LIBCPP_INLINE_VISIBILITY 363 constexpr __tuple_impl() 364 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 365 366 template <size_t ..._Uf, class ..._Tf, 367 size_t ..._Ul, class ..._Tl, class ..._Up> 368 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 369 explicit 370 __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>, 371 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 372 _Up&&... __u) 373 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 374 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) : 375 __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))..., 376 __tuple_leaf<_Ul, _Tl>()... 377 {} 378 379 template <class _Alloc, size_t ..._Uf, class ..._Tf, 380 size_t ..._Ul, class ..._Tl, class ..._Up> 381 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 382 explicit 383 __tuple_impl(allocator_arg_t, const _Alloc& __a, 384 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, 385 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 386 _Up&&... __u) : 387 __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, 388 _VSTD::forward<_Up>(__u))..., 389 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... 390 {} 391 392 template <class _Tuple, 393 class = typename enable_if 394 < 395 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 396 >::type 397 > 398 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 399 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx, 400 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 401 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx, 402 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 403 {} 404 405 template <class _Alloc, class _Tuple, 406 class = typename enable_if 407 < 408 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 409 >::type 410 > 411 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 412 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 413 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx, 414 typename __make_tuple_types<_Tuple>::type>::type>(), __a, 415 _VSTD::forward<typename tuple_element<_Indx, 416 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 417 {} 418 419 __tuple_impl(const __tuple_impl&) = default; 420 __tuple_impl(__tuple_impl&&) = default; 421 422 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 423 void swap(__tuple_impl& __t) 424 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 425 { 426 _VSTD::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 427 } 428}; 429 430template<class _Dest, class _Source, size_t ..._Np> 431_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 432void __memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) { 433 _VSTD::__swallow(((_VSTD::get<_Np>(__dest) = _VSTD::get<_Np>(__source)), void(), 0)...); 434} 435 436template<class _Dest, class _Source, class ..._Up, size_t ..._Np> 437_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 438void __memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) { 439 _VSTD::__swallow((( 440 _VSTD::get<_Np>(__dest) = _VSTD::forward<_Up>(_VSTD::get<_Np>(__source)) 441 ), void(), 0)...); 442} 443 444template <class ..._Tp> 445class _LIBCPP_TEMPLATE_VIS tuple 446{ 447 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 448 449 _BaseT __base_; 450 451#if defined(_LIBCPP_ENABLE_TUPLE_IMPLICIT_REDUCED_ARITY_EXTENSION) 452 static constexpr bool _EnableImplicitReducedArityExtension = true; 453#else 454 static constexpr bool _EnableImplicitReducedArityExtension = false; 455#endif 456 457 template <class ..._Args> 458 struct _PackExpandsToThisTuple : false_type {}; 459 460 template <class _Arg> 461 struct _PackExpandsToThisTuple<_Arg> 462 : is_same<typename __uncvref<_Arg>::type, tuple> {}; 463 464 template <bool _MaybeEnable, class _Dummy = void> 465 struct _CheckArgsConstructor : __check_tuple_constructor_fail {}; 466 467 template <class _Dummy> 468 struct _CheckArgsConstructor<true, _Dummy> 469 { 470 template <int&...> 471 static constexpr bool __enable_implicit_default() { 472 return __all<__is_implicitly_default_constructible<_Tp>::value... >::value; 473 } 474 475 template <int&...> 476 static constexpr bool __enable_explicit_default() { 477 return 478 __all<is_default_constructible<_Tp>::value...>::value && 479 !__enable_implicit_default< >(); 480 } 481 482 483 template <class ..._Args> 484 static constexpr bool __enable_explicit() { 485 return 486 __tuple_constructible< 487 tuple<_Args...>, 488 typename __make_tuple_types<tuple, 489 sizeof...(_Args) < sizeof...(_Tp) ? 490 sizeof...(_Args) : 491 sizeof...(_Tp)>::type 492 >::value && 493 !__tuple_convertible< 494 tuple<_Args...>, 495 typename __make_tuple_types<tuple, 496 sizeof...(_Args) < sizeof...(_Tp) ? 497 sizeof...(_Args) : 498 sizeof...(_Tp)>::type 499 >::value && 500 __all_default_constructible< 501 typename __make_tuple_types<tuple, sizeof...(_Tp), 502 sizeof...(_Args) < sizeof...(_Tp) ? 503 sizeof...(_Args) : 504 sizeof...(_Tp)>::type 505 >::value; 506 } 507 508 template <class ..._Args> 509 static constexpr bool __enable_implicit() { 510 return 511 __tuple_constructible< 512 tuple<_Args...>, 513 typename __make_tuple_types<tuple, 514 sizeof...(_Args) < sizeof...(_Tp) ? 515 sizeof...(_Args) : 516 sizeof...(_Tp)>::type 517 >::value && 518 __tuple_convertible< 519 tuple<_Args...>, 520 typename __make_tuple_types<tuple, 521 sizeof...(_Args) < sizeof...(_Tp) ? 522 sizeof...(_Args) : 523 sizeof...(_Tp)>::type 524 >::value && 525 __all_default_constructible< 526 typename __make_tuple_types<tuple, sizeof...(_Tp), 527 sizeof...(_Args) < sizeof...(_Tp) ? 528 sizeof...(_Args) : 529 sizeof...(_Tp)>::type 530 >::value; 531 } 532 }; 533 534 template <bool _MaybeEnable, 535 bool = sizeof...(_Tp) == 1, 536 class _Dummy = void> 537 struct _CheckTupleLikeConstructor : __check_tuple_constructor_fail {}; 538 539 template <class _Dummy> 540 struct _CheckTupleLikeConstructor<true, false, _Dummy> 541 { 542 template <class _Tuple> 543 static constexpr bool __enable_implicit() { 544 return __tuple_constructible<_Tuple, tuple>::value 545 && __tuple_convertible<_Tuple, tuple>::value; 546 } 547 548 template <class _Tuple> 549 static constexpr bool __enable_explicit() { 550 return __tuple_constructible<_Tuple, tuple>::value 551 && !__tuple_convertible<_Tuple, tuple>::value; 552 } 553 }; 554 555 template <class _Dummy> 556 struct _CheckTupleLikeConstructor<true, true, _Dummy> 557 { 558 // This trait is used to disable the tuple-like constructor when 559 // the UTypes... constructor should be selected instead. 560 // See LWG issue #2549. 561 template <class _Tuple> 562 using _PreferTupleLikeConstructor = _Or< 563 // Don't attempt the two checks below if the tuple we are given 564 // has the same type as this tuple. 565 _IsSame<__uncvref_t<_Tuple>, tuple>, 566 _Lazy<_And, 567 _Not<is_constructible<_Tp..., _Tuple>>, 568 _Not<is_convertible<_Tuple, _Tp...>> 569 > 570 >; 571 572 template <class _Tuple> 573 static constexpr bool __enable_implicit() { 574 return _And< 575 __tuple_constructible<_Tuple, tuple>, 576 __tuple_convertible<_Tuple, tuple>, 577 _PreferTupleLikeConstructor<_Tuple> 578 >::value; 579 } 580 581 template <class _Tuple> 582 static constexpr bool __enable_explicit() { 583 return _And< 584 __tuple_constructible<_Tuple, tuple>, 585 _PreferTupleLikeConstructor<_Tuple>, 586 _Not<__tuple_convertible<_Tuple, tuple>> 587 >::value; 588 } 589 }; 590 591 template <class _Tuple, bool _DisableIfLValue> 592 using _EnableImplicitTupleLikeConstructor = _EnableIf< 593 _CheckTupleLikeConstructor< 594 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 595 && !_PackExpandsToThisTuple<_Tuple>::value 596 && (!is_lvalue_reference<_Tuple>::value || !_DisableIfLValue) 597 >::template __enable_implicit<_Tuple>(), 598 bool 599 >; 600 601 template <class _Tuple, bool _DisableIfLValue> 602 using _EnableExplicitTupleLikeConstructor = _EnableIf< 603 _CheckTupleLikeConstructor< 604 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 605 && !_PackExpandsToThisTuple<_Tuple>::value 606 && (!is_lvalue_reference<_Tuple>::value || !_DisableIfLValue) 607 >::template __enable_explicit<_Tuple>(), 608 bool 609 >; 610 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 611 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 612 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 613 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT; 614 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 615 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT; 616 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 617 const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT; 618public: 619 620 template <bool _Dummy = true, _EnableIf< 621 _CheckArgsConstructor<_Dummy>::__enable_implicit_default() 622 , void*> = nullptr> 623 _LIBCPP_INLINE_VISIBILITY constexpr 624 tuple() 625 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 626 627 template <bool _Dummy = true, _EnableIf< 628 _CheckArgsConstructor<_Dummy>::__enable_explicit_default() 629 , void*> = nullptr> 630 explicit _LIBCPP_INLINE_VISIBILITY constexpr 631 tuple() 632 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 633 634 tuple(tuple const&) = default; 635 tuple(tuple&&) = default; 636 637 template <class _AllocArgT, class _Alloc, _EnableIf< 638 _CheckArgsConstructor<_IsSame<allocator_arg_t, _AllocArgT>::value >::__enable_implicit_default() 639 , void*> = nullptr 640 > 641 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 642 tuple(_AllocArgT, _Alloc const& __a) 643 : __base_(allocator_arg_t(), __a, 644 __tuple_indices<>(), __tuple_types<>(), 645 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 646 __tuple_types<_Tp...>()) {} 647 648 template <class _AllocArgT, class _Alloc, _EnableIf< 649 _CheckArgsConstructor<_IsSame<allocator_arg_t, _AllocArgT>::value>::__enable_explicit_default() 650 , void*> = nullptr 651 > 652 explicit _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 653 tuple(_AllocArgT, _Alloc const& __a) 654 : __base_(allocator_arg_t(), __a, 655 __tuple_indices<>(), __tuple_types<>(), 656 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 657 __tuple_types<_Tp...>()) {} 658 659 template <bool _Dummy = true, 660 typename enable_if 661 < 662 _CheckArgsConstructor< 663 _Dummy 664 >::template __enable_implicit<_Tp const&...>(), 665 bool 666 >::type = false 667 > 668 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 669 tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 670 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 671 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 672 typename __make_tuple_indices<0>::type(), 673 typename __make_tuple_types<tuple, 0>::type(), 674 __t... 675 ) {} 676 677 template <bool _Dummy = true, 678 typename enable_if 679 < 680 _CheckArgsConstructor< 681 _Dummy 682 >::template __enable_explicit<_Tp const&...>(), 683 bool 684 >::type = false 685 > 686 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 687 explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 688 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 689 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 690 typename __make_tuple_indices<0>::type(), 691 typename __make_tuple_types<tuple, 0>::type(), 692 __t... 693 ) {} 694 695 template <class _Alloc, bool _Dummy = true, 696 typename enable_if 697 < 698 _CheckArgsConstructor< 699 _Dummy 700 >::template __enable_implicit<_Tp const&...>(), 701 bool 702 >::type = false 703 > 704 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 705 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 706 : __base_(allocator_arg_t(), __a, 707 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 708 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 709 typename __make_tuple_indices<0>::type(), 710 typename __make_tuple_types<tuple, 0>::type(), 711 __t... 712 ) {} 713 714 template <class _Alloc, bool _Dummy = true, 715 typename enable_if 716 < 717 _CheckArgsConstructor< 718 _Dummy 719 >::template __enable_explicit<_Tp const&...>(), 720 bool 721 >::type = false 722 > 723 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 724 explicit 725 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 726 : __base_(allocator_arg_t(), __a, 727 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 728 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 729 typename __make_tuple_indices<0>::type(), 730 typename __make_tuple_types<tuple, 0>::type(), 731 __t... 732 ) {} 733 734 template <class ..._Up, 735 bool _PackIsTuple = _PackExpandsToThisTuple<_Up...>::value, 736 typename enable_if 737 < 738 _CheckArgsConstructor< 739 sizeof...(_Up) == sizeof...(_Tp) 740 && !_PackIsTuple 741 >::template __enable_implicit<_Up...>() || 742 _CheckArgsConstructor< 743 _EnableImplicitReducedArityExtension 744 && sizeof...(_Up) < sizeof...(_Tp) 745 && !_PackIsTuple 746 >::template __enable_implicit<_Up...>(), 747 bool 748 >::type = false 749 > 750 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 751 tuple(_Up&&... __u) 752 _NOEXCEPT_(( 753 is_nothrow_constructible<_BaseT, 754 typename __make_tuple_indices<sizeof...(_Up)>::type, 755 typename __make_tuple_types<tuple, sizeof...(_Up)>::type, 756 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type, 757 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type, 758 _Up... 759 >::value 760 )) 761 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 762 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 763 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 764 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 765 _VSTD::forward<_Up>(__u)...) {} 766 767 template <class ..._Up, 768 typename enable_if 769 < 770 _CheckArgsConstructor< 771 sizeof...(_Up) <= sizeof...(_Tp) 772 && !_PackExpandsToThisTuple<_Up...>::value 773 >::template __enable_explicit<_Up...>() || 774 _CheckArgsConstructor< 775 !_EnableImplicitReducedArityExtension 776 && sizeof...(_Up) < sizeof...(_Tp) 777 && !_PackExpandsToThisTuple<_Up...>::value 778 >::template __enable_implicit<_Up...>(), 779 bool 780 >::type = false 781 > 782 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 783 explicit 784 tuple(_Up&&... __u) 785 _NOEXCEPT_(( 786 is_nothrow_constructible<_BaseT, 787 typename __make_tuple_indices<sizeof...(_Up)>::type, 788 typename __make_tuple_types<tuple, sizeof...(_Up)>::type, 789 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type, 790 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type, 791 _Up... 792 >::value 793 )) 794 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 795 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 796 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 797 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 798 _VSTD::forward<_Up>(__u)...) {} 799 800 template <class _Alloc, class ..._Up, 801 typename enable_if 802 < 803 _CheckArgsConstructor< 804 sizeof...(_Up) == sizeof...(_Tp) && 805 !_PackExpandsToThisTuple<_Up...>::value 806 >::template __enable_implicit<_Up...>(), 807 bool 808 >::type = false 809 > 810 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 811 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 812 : __base_(allocator_arg_t(), __a, 813 typename __make_tuple_indices<sizeof...(_Up)>::type(), 814 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 815 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 816 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 817 _VSTD::forward<_Up>(__u)...) {} 818 819 template <class _Alloc, class ..._Up, 820 typename enable_if 821 < 822 _CheckArgsConstructor< 823 sizeof...(_Up) == sizeof...(_Tp) && 824 !_PackExpandsToThisTuple<_Up...>::value 825 >::template __enable_explicit<_Up...>(), 826 bool 827 >::type = false 828 > 829 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 830 explicit 831 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 832 : __base_(allocator_arg_t(), __a, 833 typename __make_tuple_indices<sizeof...(_Up)>::type(), 834 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 835 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 836 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 837 _VSTD::forward<_Up>(__u)...) {} 838 839 template <class _Tuple, _EnableImplicitTupleLikeConstructor<_Tuple, true> = false> 840 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 841 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, _Tuple>::value)) 842 : __base_(_VSTD::forward<_Tuple>(__t)) {} 843 844 template <class _Tuple, _EnableImplicitTupleLikeConstructor<const _Tuple&, false> = false> 845 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 846 tuple(const _Tuple& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, const _Tuple&>::value)) 847 : __base_(__t) {} 848 template <class _Tuple, _EnableExplicitTupleLikeConstructor<_Tuple, true> = false> 849 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 850 explicit 851 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, _Tuple>::value)) 852 : __base_(_VSTD::forward<_Tuple>(__t)) {} 853 854 template <class _Tuple, _EnableExplicitTupleLikeConstructor<const _Tuple&, false> = false> 855 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 856 explicit 857 tuple(const _Tuple& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, const _Tuple&>::value)) 858 : __base_(__t) {} 859 860 template <class _Alloc, class _Tuple, 861 typename enable_if 862 < 863 _CheckTupleLikeConstructor< 864 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 865 >::template __enable_implicit<_Tuple>(), 866 bool 867 >::type = false 868 > 869 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 870 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 871 : __base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {} 872 873 template <class _Alloc, class _Tuple, 874 typename enable_if 875 < 876 _CheckTupleLikeConstructor< 877 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 878 >::template __enable_explicit<_Tuple>(), 879 bool 880 >::type = false 881 > 882 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 883 explicit 884 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 885 : __base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {} 886 887 // [tuple.assign] 888 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 889 tuple& operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple) 890 _NOEXCEPT_((_And<is_nothrow_copy_assignable<_Tp>...>::value)) 891 { 892 _VSTD::__memberwise_copy_assign(*this, __tuple, 893 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 894 return *this; 895 } 896 897 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 898 tuple& operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple) 899 _NOEXCEPT_((_And<is_nothrow_move_assignable<_Tp>...>::value)) 900 { 901 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 902 __tuple_types<_Tp...>(), 903 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 904 return *this; 905 } 906 907 template<class... _Up, _EnableIf< 908 _And< 909 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 910 is_assignable<_Tp&, _Up const&>... 911 >::value 912 ,int> = 0> 913 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 914 tuple& operator=(tuple<_Up...> const& __tuple) 915 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 916 { 917 _VSTD::__memberwise_copy_assign(*this, __tuple, 918 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 919 return *this; 920 } 921 922 template<class... _Up, _EnableIf< 923 _And< 924 _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, 925 is_assignable<_Tp&, _Up>... 926 >::value 927 ,int> = 0> 928 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 929 tuple& operator=(tuple<_Up...>&& __tuple) 930 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 931 { 932 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__tuple), 933 __tuple_types<_Up...>(), 934 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 935 return *this; 936 } 937 938 template<class _Up1, class _Up2, class _Dep = true_type, _EnableIf< 939 _And<_Dep, 940 _BoolConstant<sizeof...(_Tp) == 2>, 941 is_assignable<_FirstType<_Tp..., _Dep>&, _Up1 const&>, 942 is_assignable<_SecondType<_Tp..., _Dep>&, _Up2 const&> 943 >::value 944 ,int> = 0> 945 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 946 tuple& operator=(pair<_Up1, _Up2> const& __pair) 947 _NOEXCEPT_((_And< 948 is_nothrow_assignable<_FirstType<_Tp...>&, _Up1 const&>, 949 is_nothrow_assignable<_SecondType<_Tp...>&, _Up2 const&> 950 >::value)) 951 { 952 _VSTD::get<0>(*this) = __pair.first; 953 _VSTD::get<1>(*this) = __pair.second; 954 return *this; 955 } 956 957 template<class _Up1, class _Up2, class _Dep = true_type, _EnableIf< 958 _And<_Dep, 959 _BoolConstant<sizeof...(_Tp) == 2>, 960 is_assignable<_FirstType<_Tp..., _Dep>&, _Up1>, 961 is_assignable<_SecondType<_Tp..., _Dep>&, _Up2> 962 >::value 963 ,int> = 0> 964 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 965 tuple& operator=(pair<_Up1, _Up2>&& __pair) 966 _NOEXCEPT_((_And< 967 is_nothrow_assignable<_FirstType<_Tp...>&, _Up1>, 968 is_nothrow_assignable<_SecondType<_Tp...>&, _Up2> 969 >::value)) 970 { 971 _VSTD::get<0>(*this) = _VSTD::forward<_Up1>(__pair.first); 972 _VSTD::get<1>(*this) = _VSTD::forward<_Up2>(__pair.second); 973 return *this; 974 } 975 976 // EXTENSION 977 template<class _Up, size_t _Np, class = _EnableIf< 978 _And< 979 _BoolConstant<_Np == sizeof...(_Tp)>, 980 is_assignable<_Tp&, _Up const&>... 981 >::value 982 > > 983 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 984 tuple& operator=(array<_Up, _Np> const& __array) 985 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value)) 986 { 987 _VSTD::__memberwise_copy_assign(*this, __array, 988 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 989 return *this; 990 } 991 992 // EXTENSION 993 template<class _Up, size_t _Np, class = void, class = _EnableIf< 994 _And< 995 _BoolConstant<_Np == sizeof...(_Tp)>, 996 is_assignable<_Tp&, _Up>... 997 >::value 998 > > 999 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1000 tuple& operator=(array<_Up, _Np>&& __array) 1001 _NOEXCEPT_((_And<is_nothrow_assignable<_Tp&, _Up>...>::value)) 1002 { 1003 _VSTD::__memberwise_forward_assign(*this, _VSTD::move(__array), 1004 __tuple_types<_If<true, _Up, _Tp>...>(), 1005 typename __make_tuple_indices<sizeof...(_Tp)>::type()); 1006 return *this; 1007 } 1008 1009 // [tuple.swap] 1010 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1011 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1012 {__base_.swap(__t.__base_);} 1013}; 1014 1015template <> 1016class _LIBCPP_TEMPLATE_VIS tuple<> 1017{ 1018public: 1019 _LIBCPP_INLINE_VISIBILITY constexpr 1020 tuple() _NOEXCEPT = default; 1021 template <class _Alloc> 1022 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1023 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 1024 template <class _Alloc> 1025 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1026 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 1027 template <class _Up> 1028 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1029 tuple(array<_Up, 0>) _NOEXCEPT {} 1030 template <class _Alloc, class _Up> 1031 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1032 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 1033 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1034 void swap(tuple&) _NOEXCEPT {} 1035}; 1036 1037#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES 1038template <class ..._Tp> 1039tuple(_Tp...) -> tuple<_Tp...>; 1040template <class _Tp1, class _Tp2> 1041tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1042template <class _Alloc, class ..._Tp> 1043tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>; 1044template <class _Alloc, class _Tp1, class _Tp2> 1045tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>; 1046template <class _Alloc, class ..._Tp> 1047tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>; 1048#endif 1049 1050template <class ..._Tp> 1051inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1052typename enable_if 1053< 1054 __all<__is_swappable<_Tp>::value...>::value, 1055 void 1056>::type 1057swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 1058 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 1059 {__t.swap(__u);} 1060 1061// get 1062 1063template <size_t _Ip, class ..._Tp> 1064inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1065typename tuple_element<_Ip, tuple<_Tp...> >::type& 1066get(tuple<_Tp...>& __t) _NOEXCEPT 1067{ 1068 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1069 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1070} 1071 1072template <size_t _Ip, class ..._Tp> 1073inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1074const typename tuple_element<_Ip, tuple<_Tp...> >::type& 1075get(const tuple<_Tp...>& __t) _NOEXCEPT 1076{ 1077 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1078 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 1079} 1080 1081template <size_t _Ip, class ..._Tp> 1082inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1083typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1084get(tuple<_Tp...>&& __t) _NOEXCEPT 1085{ 1086 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1087 return static_cast<type&&>( 1088 static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1089} 1090 1091template <size_t _Ip, class ..._Tp> 1092inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1093const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 1094get(const tuple<_Tp...>&& __t) _NOEXCEPT 1095{ 1096 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type; 1097 return static_cast<const type&&>( 1098 static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 1099} 1100 1101#if _LIBCPP_STD_VER > 11 1102 1103namespace __find_detail { 1104 1105static constexpr size_t __not_found = -1; 1106static constexpr size_t __ambiguous = __not_found - 1; 1107 1108inline _LIBCPP_INLINE_VISIBILITY 1109constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { 1110 return !__matches ? __res : 1111 (__res == __not_found ? __curr_i : __ambiguous); 1112} 1113 1114template <size_t _Nx> 1115inline _LIBCPP_INLINE_VISIBILITY 1116constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { 1117 return __i == _Nx ? __not_found : 1118 __find_idx_return(__i, __find_idx(__i + 1, __matches), __matches[__i]); 1119} 1120 1121template <class _T1, class ..._Args> 1122struct __find_exactly_one_checked { 1123 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; 1124 static constexpr size_t value = __find_detail::__find_idx(0, __matches); 1125 static_assert(value != __not_found, "type not found in type list" ); 1126 static_assert(value != __ambiguous, "type occurs more than once in type list"); 1127}; 1128 1129template <class _T1> 1130struct __find_exactly_one_checked<_T1> { 1131 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); 1132}; 1133 1134} // namespace __find_detail; 1135 1136template <typename _T1, typename... _Args> 1137struct __find_exactly_one_t 1138 : public __find_detail::__find_exactly_one_checked<_T1, _Args...> { 1139}; 1140 1141template <class _T1, class... _Args> 1142inline _LIBCPP_INLINE_VISIBILITY 1143constexpr _T1& get(tuple<_Args...>& __tup) noexcept 1144{ 1145 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1146} 1147 1148template <class _T1, class... _Args> 1149inline _LIBCPP_INLINE_VISIBILITY 1150constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept 1151{ 1152 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1153} 1154 1155template <class _T1, class... _Args> 1156inline _LIBCPP_INLINE_VISIBILITY 1157constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept 1158{ 1159 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1160} 1161 1162template <class _T1, class... _Args> 1163inline _LIBCPP_INLINE_VISIBILITY 1164constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept 1165{ 1166 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1167} 1168 1169#endif 1170 1171// tie 1172 1173template <class ..._Tp> 1174inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1175tuple<_Tp&...> 1176tie(_Tp&... __t) _NOEXCEPT 1177{ 1178 return tuple<_Tp&...>(__t...); 1179} 1180 1181template <class _Up> 1182struct __ignore_t 1183{ 1184 template <class _Tp> 1185 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1186 const __ignore_t& operator=(_Tp&&) const {return *this;} 1187}; 1188 1189namespace { 1190 _LIBCPP_INLINE_VAR constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1191} 1192 1193template <class... _Tp> 1194inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1195tuple<typename __unwrap_ref_decay<_Tp>::type...> 1196make_tuple(_Tp&&... __t) 1197{ 1198 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...); 1199} 1200 1201template <class... _Tp> 1202inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1203tuple<_Tp&&...> 1204forward_as_tuple(_Tp&&... __t) _NOEXCEPT 1205{ 1206 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...); 1207} 1208 1209template <size_t _Ip> 1210struct __tuple_equal 1211{ 1212 template <class _Tp, class _Up> 1213 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1214 bool operator()(const _Tp& __x, const _Up& __y) 1215 { 1216 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y); 1217 } 1218}; 1219 1220template <> 1221struct __tuple_equal<0> 1222{ 1223 template <class _Tp, class _Up> 1224 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1225 bool operator()(const _Tp&, const _Up&) 1226 { 1227 return true; 1228 } 1229}; 1230 1231template <class ..._Tp, class ..._Up> 1232inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1233bool 1234operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1235{ 1236 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1237 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1238} 1239 1240template <class ..._Tp, class ..._Up> 1241inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1242bool 1243operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1244{ 1245 return !(__x == __y); 1246} 1247 1248template <size_t _Ip> 1249struct __tuple_less 1250{ 1251 template <class _Tp, class _Up> 1252 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1253 bool operator()(const _Tp& __x, const _Up& __y) 1254 { 1255 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1256 if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y)) 1257 return true; 1258 if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x)) 1259 return false; 1260 return __tuple_less<_Ip-1>()(__x, __y); 1261 } 1262}; 1263 1264template <> 1265struct __tuple_less<0> 1266{ 1267 template <class _Tp, class _Up> 1268 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1269 bool operator()(const _Tp&, const _Up&) 1270 { 1271 return false; 1272 } 1273}; 1274 1275template <class ..._Tp, class ..._Up> 1276inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1277bool 1278operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1279{ 1280 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes"); 1281 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1282} 1283 1284template <class ..._Tp, class ..._Up> 1285inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1286bool 1287operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1288{ 1289 return __y < __x; 1290} 1291 1292template <class ..._Tp, class ..._Up> 1293inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1294bool 1295operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1296{ 1297 return !(__x < __y); 1298} 1299 1300template <class ..._Tp, class ..._Up> 1301inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1302bool 1303operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1304{ 1305 return !(__y < __x); 1306} 1307 1308// tuple_cat 1309 1310template <class _Tp, class _Up> struct __tuple_cat_type; 1311 1312template <class ..._Ttypes, class ..._Utypes> 1313struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > 1314{ 1315 typedef _LIBCPP_NODEBUG_TYPE tuple<_Ttypes..., _Utypes...> type; 1316}; 1317 1318template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples> 1319struct __tuple_cat_return_1 1320{ 1321}; 1322 1323template <class ..._Types, class _Tuple0> 1324struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> 1325{ 1326 typedef _LIBCPP_NODEBUG_TYPE typename __tuple_cat_type<tuple<_Types...>, 1327 typename __make_tuple_types<typename __uncvref<_Tuple0>::type>::type>::type 1328 type; 1329}; 1330 1331template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples> 1332struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1333 : public __tuple_cat_return_1< 1334 typename __tuple_cat_type< 1335 tuple<_Types...>, 1336 typename __make_tuple_types<typename __uncvref<_Tuple0>::type>::type 1337 >::type, 1338 __tuple_like<typename remove_reference<_Tuple1>::type>::value, 1339 _Tuple1, _Tuples...> 1340{ 1341}; 1342 1343template <class ..._Tuples> struct __tuple_cat_return; 1344 1345template <class _Tuple0, class ..._Tuples> 1346struct __tuple_cat_return<_Tuple0, _Tuples...> 1347 : public __tuple_cat_return_1<tuple<>, 1348 __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0, 1349 _Tuples...> 1350{ 1351}; 1352 1353template <> 1354struct __tuple_cat_return<> 1355{ 1356 typedef _LIBCPP_NODEBUG_TYPE tuple<> type; 1357}; 1358 1359inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1360tuple<> 1361tuple_cat() 1362{ 1363 return tuple<>(); 1364} 1365 1366template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples> 1367struct __tuple_cat_return_ref_imp; 1368 1369template <class ..._Types, size_t ..._I0, class _Tuple0> 1370struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> 1371{ 1372 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0; 1373 typedef tuple<_Types..., typename __apply_cv<_Tuple0, 1374 typename tuple_element<_I0, _T0>::type>::type&&...> type; 1375}; 1376 1377template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples> 1378struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, 1379 _Tuple0, _Tuple1, _Tuples...> 1380 : public __tuple_cat_return_ref_imp< 1381 tuple<_Types..., typename __apply_cv<_Tuple0, 1382 typename tuple_element<_I0, 1383 typename remove_reference<_Tuple0>::type>::type>::type&&...>, 1384 typename __make_tuple_indices<tuple_size<typename 1385 remove_reference<_Tuple1>::type>::value>::type, 1386 _Tuple1, _Tuples...> 1387{ 1388}; 1389 1390template <class _Tuple0, class ..._Tuples> 1391struct __tuple_cat_return_ref 1392 : public __tuple_cat_return_ref_imp<tuple<>, 1393 typename __make_tuple_indices< 1394 tuple_size<typename remove_reference<_Tuple0>::type>::value 1395 >::type, _Tuple0, _Tuples...> 1396{ 1397}; 1398 1399template <class _Types, class _I0, class _J0> 1400struct __tuple_cat; 1401 1402template <class ..._Types, size_t ..._I0, size_t ..._J0> 1403struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > 1404{ 1405 template <class _Tuple0> 1406 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1407 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1408 operator()(tuple<_Types...> __t, _Tuple0&& __t0) 1409 { 1410 return _VSTD::forward_as_tuple( 1411 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1412 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...); 1413 } 1414 1415 template <class _Tuple0, class _Tuple1, class ..._Tuples> 1416 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1417 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1418 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls) 1419 { 1420 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0; 1421 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple1>::type _T1; 1422 return __tuple_cat< 1423 tuple<_Types..., 1424 typename __apply_cv<_Tuple0, typename tuple_element< 1425 _J0, _T0>::type>::type&&...>, 1426 typename __make_tuple_indices<sizeof...(_Types) + 1427 tuple_size<_T0>::value>::type, 1428 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()( 1429 _VSTD::forward_as_tuple( 1430 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1431 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...), 1432 _VSTD::forward<_Tuple1>(__t1), _VSTD::forward<_Tuples>(__tpls)...); 1433 } 1434}; 1435 1436template <class _Tuple0, class... _Tuples> 1437inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1438typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1439tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) 1440{ 1441 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0; 1442 return __tuple_cat<tuple<>, __tuple_indices<>, 1443 typename __make_tuple_indices<tuple_size<_T0>::value>::type>() 1444 (tuple<>(), _VSTD::forward<_Tuple0>(__t0), 1445 _VSTD::forward<_Tuples>(__tpls)...); 1446} 1447 1448template <class ..._Tp, class _Alloc> 1449struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> 1450 : true_type {}; 1451 1452template <class _T1, class _T2> 1453template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2> 1454inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1455pair<_T1, _T2>::pair(piecewise_construct_t, 1456 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 1457 __tuple_indices<_I1...>, __tuple_indices<_I2...>) 1458 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...), 1459 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...) 1460{ 1461} 1462 1463#if _LIBCPP_STD_VER > 14 1464template <class _Tp> 1465_LIBCPP_INLINE_VAR constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 1466 1467#define _LIBCPP_NOEXCEPT_RETURN(...) noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1468 1469template <class _Fn, class _Tuple, size_t ..._Id> 1470inline _LIBCPP_INLINE_VISIBILITY 1471constexpr decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, 1472 __tuple_indices<_Id...>) 1473_LIBCPP_NOEXCEPT_RETURN( 1474 _VSTD::__invoke_constexpr( 1475 _VSTD::forward<_Fn>(__f), 1476 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...) 1477) 1478 1479template <class _Fn, class _Tuple> 1480inline _LIBCPP_INLINE_VISIBILITY 1481constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t) 1482_LIBCPP_NOEXCEPT_RETURN( 1483 _VSTD::__apply_tuple_impl( 1484 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), 1485 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1486) 1487 1488template <class _Tp, class _Tuple, size_t... _Idx> 1489inline _LIBCPP_INLINE_VISIBILITY 1490constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1491_LIBCPP_NOEXCEPT_RETURN( 1492 _Tp(_VSTD::get<_Idx>(_VSTD::forward<_Tuple>(__t))...) 1493) 1494 1495template <class _Tp, class _Tuple> 1496inline _LIBCPP_INLINE_VISIBILITY 1497constexpr _Tp make_from_tuple(_Tuple&& __t) 1498_LIBCPP_NOEXCEPT_RETURN( 1499 _VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t), 1500 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}) 1501) 1502 1503#undef _LIBCPP_NOEXCEPT_RETURN 1504 1505#endif // _LIBCPP_STD_VER > 14 1506 1507#endif // !defined(_LIBCPP_CXX03_LANG) 1508 1509_LIBCPP_END_NAMESPACE_STD 1510 1511#endif // _LIBCPP_TUPLE 1512