1// -*- C++ -*- 2//===--------------------------- tuple ------------------------------------===// 3// 4// The LLVM Compiler Infrastructure 5// 6// This file is distributed under the University of Illinois Open Source 7// License. See LICENSE.TXT for details. 8// 9//===----------------------------------------------------------------------===// 10 11#ifndef _LIBCPP_TUPLE 12#define _LIBCPP_TUPLE 13 14/* 15 tuple synopsis 16 17namespace std 18{ 19 20template <class... T> 21class tuple { 22public: 23 constexpr tuple(); 24 explicit tuple(const T&...); // constexpr in C++14 25 template <class... U> 26 explicit tuple(U&&...); // constexpr in C++14 27 tuple(const tuple&) = default; 28 tuple(tuple&&) = default; 29 template <class... U> 30 tuple(const tuple<U...>&); // constexpr in C++14 31 template <class... U> 32 tuple(tuple<U...>&&); // constexpr in C++14 33 template <class U1, class U2> 34 tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14 35 template <class U1, class U2> 36 tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14 37 38 // allocator-extended constructors 39 template <class Alloc> 40 tuple(allocator_arg_t, const Alloc& a); 41 template <class Alloc> 42 tuple(allocator_arg_t, const Alloc& a, const T&...); 43 template <class Alloc, class... U> 44 tuple(allocator_arg_t, const Alloc& a, U&&...); 45 template <class Alloc> 46 tuple(allocator_arg_t, const Alloc& a, const tuple&); 47 template <class Alloc> 48 tuple(allocator_arg_t, const Alloc& a, tuple&&); 49 template <class Alloc, class... U> 50 tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); 51 template <class Alloc, class... U> 52 tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); 53 template <class Alloc, class U1, class U2> 54 tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); 55 template <class Alloc, class U1, class U2> 56 tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); 57 58 tuple& operator=(const tuple&); 59 tuple& 60 operator=(tuple&&) noexcept(AND(is_nothrow_move_assignable<T>::value ...)); 61 template <class... U> 62 tuple& operator=(const tuple<U...>&); 63 template <class... U> 64 tuple& operator=(tuple<U...>&&); 65 template <class U1, class U2> 66 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 67 template <class U1, class U2> 68 tuple& operator=(pair<U1, U2>&&); //iffsizeof...(T) == 2 69 70 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); 71}; 72 73inline constexpr unspecified ignore; 74 75template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14 76template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14 77template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14 78template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14 79 80// [tuple.apply], calling a function with a tuple of arguments: 81template <class F, class Tuple> 82 constexpr decltype(auto) apply(F&& f, Tuple&& t); // C++17 83template <class T, class Tuple> 84 constexpr T make_from_tuple(Tuple&& t); // C++17 85 86// 20.4.1.4, tuple helper classes: 87template <class T> class tuple_size; // undefined 88template <class... T> class tuple_size<tuple<T...>>; 89template <class T> 90 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17 91template <size_t I, class T> class tuple_element; // undefined 92template <size_t I, class... T> class tuple_element<I, tuple<T...>>; 93template <size_t I, class T> 94 using tuple_element_t = typename tuple_element <I, T>::type; // C++14 95 96// 20.4.1.5, element access: 97template <size_t I, class... T> 98 typename tuple_element<I, tuple<T...>>::type& 99 get(tuple<T...>&) noexcept; // constexpr in C++14 100template <size_t I, class... T> 101 const typename tuple_element<I, tuple<T...>>::type& 102 get(const tuple<T...>&) noexcept; // constexpr in C++14 103template <size_t I, class... T> 104 typename tuple_element<I, tuple<T...>>::type&& 105 get(tuple<T...>&&) noexcept; // constexpr in C++14 106template <size_t I, class... T> 107 const typename tuple_element<I, tuple<T...>>::type&& 108 get(const tuple<T...>&&) noexcept; // constexpr in C++14 109 110template <class T1, class... T> 111 constexpr T1& get(tuple<T...>&) noexcept; // C++14 112template <class T1, class... T> 113 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14 114template <class T1, class... T> 115 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 116template <class T1, class... T> 117 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14 118 119// 20.4.1.6, relational operators: 120template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 121template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 122template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 123template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 124template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 125template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 126 127template <class... Types, class Alloc> 128 struct uses_allocator<tuple<Types...>, Alloc>; 129 130template <class... Types> 131 void 132 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 133 134} // std 135 136*/ 137 138#include <__config> 139#include <__tuple> 140#include <cstddef> 141#include <type_traits> 142#include <__functional_base> 143#include <utility> 144 145#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 146#pragma GCC system_header 147#endif 148 149_LIBCPP_BEGIN_NAMESPACE_STD 150 151#ifndef _LIBCPP_CXX03_LANG 152 153 154// __tuple_leaf 155 156template <size_t _Ip, class _Hp, 157 bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value 158 > 159class __tuple_leaf; 160 161template <size_t _Ip, class _Hp, bool _Ep> 162inline _LIBCPP_INLINE_VISIBILITY 163void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 164 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) 165{ 166 swap(__x.get(), __y.get()); 167} 168 169template <size_t _Ip, class _Hp, bool> 170class __tuple_leaf 171{ 172 _Hp __value_; 173 174 template <class _Tp> 175 static constexpr bool __can_bind_reference() { 176 using _RawTp = typename remove_reference<_Tp>::type; 177 using _RawHp = typename remove_reference<_Hp>::type; 178 using _CheckLValueArg = integral_constant<bool, 179 is_lvalue_reference<_Tp>::value 180 || is_same<_RawTp, reference_wrapper<_RawHp>>::value 181 || is_same<_RawTp, reference_wrapper<typename remove_const<_RawHp>::type>>::value 182 >; 183 return !is_reference<_Hp>::value 184 || (is_lvalue_reference<_Hp>::value && _CheckLValueArg::value) 185 || (is_rvalue_reference<_Hp>::value && !is_lvalue_reference<_Tp>::value); 186 } 187 188 __tuple_leaf& operator=(const __tuple_leaf&); 189public: 190 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf() 191 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_() 192 {static_assert(!is_reference<_Hp>::value, 193 "Attempted to default construct a reference element in a tuple");} 194 195 template <class _Alloc> 196 _LIBCPP_INLINE_VISIBILITY 197 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) 198 : __value_() 199 {static_assert(!is_reference<_Hp>::value, 200 "Attempted to default construct a reference element in a tuple");} 201 202 template <class _Alloc> 203 _LIBCPP_INLINE_VISIBILITY 204 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 205 : __value_(allocator_arg_t(), __a) 206 {static_assert(!is_reference<_Hp>::value, 207 "Attempted to default construct a reference element in a tuple");} 208 209 template <class _Alloc> 210 _LIBCPP_INLINE_VISIBILITY 211 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 212 : __value_(__a) 213 {static_assert(!is_reference<_Hp>::value, 214 "Attempted to default construct a reference element in a tuple");} 215 216 template <class _Tp, 217 class = typename enable_if< 218 __lazy_and< 219 __lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>> 220 , is_constructible<_Hp, _Tp> 221 >::value 222 >::type 223 > 224 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 225 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 226 : __value_(_VSTD::forward<_Tp>(__t)) 227 {static_assert(__can_bind_reference<_Tp>(), 228 "Attempted to construct a reference element in a tuple with an rvalue");} 229 230 template <class _Tp, class _Alloc> 231 _LIBCPP_INLINE_VISIBILITY 232 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 233 : __value_(_VSTD::forward<_Tp>(__t)) 234 {static_assert(__can_bind_reference<_Tp>(), 235 "Attempted to construct a reference element in a tuple with an rvalue");} 236 237 template <class _Tp, class _Alloc> 238 _LIBCPP_INLINE_VISIBILITY 239 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 240 : __value_(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) 241 {static_assert(!is_reference<_Hp>::value, 242 "Attempted to uses-allocator construct a reference element in a tuple");} 243 244 template <class _Tp, class _Alloc> 245 _LIBCPP_INLINE_VISIBILITY 246 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 247 : __value_(_VSTD::forward<_Tp>(__t), __a) 248 {static_assert(!is_reference<_Hp>::value, 249 "Attempted to uses-allocator construct a reference element in a tuple");} 250 251 __tuple_leaf(const __tuple_leaf& __t) = default; 252 __tuple_leaf(__tuple_leaf&& __t) = default; 253 254 template <class _Tp> 255 _LIBCPP_INLINE_VISIBILITY 256 __tuple_leaf& 257 operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value)) 258 { 259 __value_ = _VSTD::forward<_Tp>(__t); 260 return *this; 261 } 262 263 _LIBCPP_INLINE_VISIBILITY 264 int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 265 { 266 _VSTD::swap(*this, __t); 267 return 0; 268 } 269 270 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return __value_;} 271 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return __value_;} 272}; 273 274template <size_t _Ip, class _Hp> 275class __tuple_leaf<_Ip, _Hp, true> 276 : private _Hp 277{ 278 279 __tuple_leaf& operator=(const __tuple_leaf&); 280public: 281 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf() 282 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 283 284 template <class _Alloc> 285 _LIBCPP_INLINE_VISIBILITY 286 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 287 288 template <class _Alloc> 289 _LIBCPP_INLINE_VISIBILITY 290 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 291 : _Hp(allocator_arg_t(), __a) {} 292 293 template <class _Alloc> 294 _LIBCPP_INLINE_VISIBILITY 295 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 296 : _Hp(__a) {} 297 298 template <class _Tp, 299 class = typename enable_if< 300 __lazy_and< 301 __lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>> 302 , is_constructible<_Hp, _Tp> 303 >::value 304 >::type 305 > 306 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 307 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 308 : _Hp(_VSTD::forward<_Tp>(__t)) {} 309 310 template <class _Tp, class _Alloc> 311 _LIBCPP_INLINE_VISIBILITY 312 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 313 : _Hp(_VSTD::forward<_Tp>(__t)) {} 314 315 template <class _Tp, class _Alloc> 316 _LIBCPP_INLINE_VISIBILITY 317 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 318 : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {} 319 320 template <class _Tp, class _Alloc> 321 _LIBCPP_INLINE_VISIBILITY 322 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 323 : _Hp(_VSTD::forward<_Tp>(__t), __a) {} 324 325 __tuple_leaf(__tuple_leaf const &) = default; 326 __tuple_leaf(__tuple_leaf &&) = default; 327 328 template <class _Tp> 329 _LIBCPP_INLINE_VISIBILITY 330 __tuple_leaf& 331 operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value)) 332 { 333 _Hp::operator=(_VSTD::forward<_Tp>(__t)); 334 return *this; 335 } 336 337 _LIBCPP_INLINE_VISIBILITY 338 int 339 swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 340 { 341 _VSTD::swap(*this, __t); 342 return 0; 343 } 344 345 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);} 346 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);} 347}; 348 349template <class ..._Tp> 350_LIBCPP_INLINE_VISIBILITY 351void __swallow(_Tp&&...) _NOEXCEPT {} 352 353template <class ..._Tp> 354struct __lazy_all : __all<_Tp::value...> {}; 355 356template <class _Tp> 357struct __all_default_constructible; 358 359template <class ..._Tp> 360struct __all_default_constructible<__tuple_types<_Tp...>> 361 : __all<is_default_constructible<_Tp>::value...> 362{ }; 363 364// __tuple_impl 365 366template<class _Indx, class ..._Tp> struct __tuple_impl; 367 368template<size_t ..._Indx, class ..._Tp> 369struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 370 : public __tuple_leaf<_Indx, _Tp>... 371{ 372 _LIBCPP_INLINE_VISIBILITY 373 _LIBCPP_CONSTEXPR __tuple_impl() 374 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 375 376 template <size_t ..._Uf, class ..._Tf, 377 size_t ..._Ul, class ..._Tl, class ..._Up> 378 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 379 explicit 380 __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>, 381 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 382 _Up&&... __u) 383 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 384 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) : 385 __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))..., 386 __tuple_leaf<_Ul, _Tl>()... 387 {} 388 389 template <class _Alloc, size_t ..._Uf, class ..._Tf, 390 size_t ..._Ul, class ..._Tl, class ..._Up> 391 _LIBCPP_INLINE_VISIBILITY 392 explicit 393 __tuple_impl(allocator_arg_t, const _Alloc& __a, 394 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, 395 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 396 _Up&&... __u) : 397 __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, 398 _VSTD::forward<_Up>(__u))..., 399 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... 400 {} 401 402 template <class _Tuple, 403 class = typename enable_if 404 < 405 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 406 >::type 407 > 408 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 409 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx, 410 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 411 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx, 412 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 413 {} 414 415 template <class _Alloc, class _Tuple, 416 class = typename enable_if 417 < 418 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 419 >::type 420 > 421 _LIBCPP_INLINE_VISIBILITY 422 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 423 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx, 424 typename __make_tuple_types<_Tuple>::type>::type>(), __a, 425 _VSTD::forward<typename tuple_element<_Indx, 426 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 427 {} 428 429 template <class _Tuple> 430 _LIBCPP_INLINE_VISIBILITY 431 typename enable_if 432 < 433 __tuple_assignable<_Tuple, tuple<_Tp...> >::value, 434 __tuple_impl& 435 >::type 436 operator=(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_assignable<_Tp&, typename tuple_element<_Indx, 437 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 438 { 439 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<typename tuple_element<_Indx, 440 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...); 441 return *this; 442 } 443 444 __tuple_impl(const __tuple_impl&) = default; 445 __tuple_impl(__tuple_impl&&) = default; 446 447 _LIBCPP_INLINE_VISIBILITY 448 __tuple_impl& 449 operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value)) 450 { 451 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...); 452 return *this; 453 } 454 455 _LIBCPP_INLINE_VISIBILITY 456 __tuple_impl& 457 operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value)) 458 { 459 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...); 460 return *this; 461 } 462 463 _LIBCPP_INLINE_VISIBILITY 464 void swap(__tuple_impl& __t) 465 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 466 { 467 __swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 468 } 469}; 470 471 472 473template <class ..._Tp> 474class _LIBCPP_TEMPLATE_VIS tuple 475{ 476 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT; 477 478 _BaseT __base_; 479 480#if defined(_LIBCPP_ENABLE_TUPLE_IMPLICIT_REDUCED_ARITY_EXTENSION) 481 static constexpr bool _EnableImplicitReducedArityExtension = true; 482#else 483 static constexpr bool _EnableImplicitReducedArityExtension = false; 484#endif 485 486 template <class ..._Args> 487 struct _PackExpandsToThisTuple : false_type {}; 488 489 template <class _Arg> 490 struct _PackExpandsToThisTuple<_Arg> 491 : is_same<typename __uncvref<_Arg>::type, tuple> {}; 492 493 template <bool _MaybeEnable, class _Dummy = void> 494 struct _CheckArgsConstructor : __check_tuple_constructor_fail {}; 495 496 template <class _Dummy> 497 struct _CheckArgsConstructor<true, _Dummy> 498 { 499 template <class ..._Args> 500 static constexpr bool __enable_default() { 501 return __all<is_default_constructible<_Args>::value...>::value; 502 } 503 504 template <class ..._Args> 505 static constexpr bool __enable_explicit() { 506 return 507 __tuple_constructible< 508 tuple<_Args...>, 509 typename __make_tuple_types<tuple, 510 sizeof...(_Args) < sizeof...(_Tp) ? 511 sizeof...(_Args) : 512 sizeof...(_Tp)>::type 513 >::value && 514 !__tuple_convertible< 515 tuple<_Args...>, 516 typename __make_tuple_types<tuple, 517 sizeof...(_Args) < sizeof...(_Tp) ? 518 sizeof...(_Args) : 519 sizeof...(_Tp)>::type 520 >::value && 521 __all_default_constructible< 522 typename __make_tuple_types<tuple, sizeof...(_Tp), 523 sizeof...(_Args) < sizeof...(_Tp) ? 524 sizeof...(_Args) : 525 sizeof...(_Tp)>::type 526 >::value; 527 } 528 529 template <class ..._Args> 530 static constexpr bool __enable_implicit() { 531 return 532 __tuple_convertible< 533 tuple<_Args...>, 534 typename __make_tuple_types<tuple, 535 sizeof...(_Args) < sizeof...(_Tp) ? 536 sizeof...(_Args) : 537 sizeof...(_Tp)>::type 538 >::value && 539 __all_default_constructible< 540 typename __make_tuple_types<tuple, sizeof...(_Tp), 541 sizeof...(_Args) < sizeof...(_Tp) ? 542 sizeof...(_Args) : 543 sizeof...(_Tp)>::type 544 >::value; 545 } 546 }; 547 548 template <bool _MaybeEnable, 549 bool = sizeof...(_Tp) == 1, 550 class _Dummy = void> 551 struct _CheckTupleLikeConstructor : __check_tuple_constructor_fail {}; 552 553 template <class _Dummy> 554 struct _CheckTupleLikeConstructor<true, false, _Dummy> 555 { 556 template <class _Tuple> 557 static constexpr bool __enable_implicit() { 558 return __tuple_convertible<_Tuple, tuple>::value; 559 } 560 561 template <class _Tuple> 562 static constexpr bool __enable_explicit() { 563 return __tuple_constructible<_Tuple, tuple>::value 564 && !__tuple_convertible<_Tuple, tuple>::value; 565 } 566 }; 567 568 template <class _Dummy> 569 struct _CheckTupleLikeConstructor<true, true, _Dummy> 570 { 571 // This trait is used to disable the tuple-like constructor when 572 // the UTypes... constructor should be selected instead. 573 // See LWG issue #2549. 574 template <class _Tuple> 575 using _PreferTupleLikeConstructor = __lazy_or< 576 // Don't attempt the two checks below if the tuple we are given 577 // has the same type as this tuple. 578 is_same<typename __uncvref<_Tuple>::type, tuple>, 579 __lazy_and< 580 __lazy_not<is_constructible<_Tp..., _Tuple>>, 581 __lazy_not<is_convertible<_Tuple, _Tp...>> 582 > 583 >; 584 585 template <class _Tuple> 586 static constexpr bool __enable_implicit() { 587 return __lazy_and< 588 __tuple_convertible<_Tuple, tuple>, 589 _PreferTupleLikeConstructor<_Tuple> 590 >::value; 591 } 592 593 template <class _Tuple> 594 static constexpr bool __enable_explicit() { 595 return __lazy_and< 596 __tuple_constructible<_Tuple, tuple>, 597 _PreferTupleLikeConstructor<_Tuple>, 598 __lazy_not<__tuple_convertible<_Tuple, tuple>> 599 >::value; 600 } 601 }; 602 603 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 604 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 605 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 606 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT; 607 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 608 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT; 609 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 610 const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT; 611public: 612 613 template <bool _Dummy = true, class = typename enable_if< 614 _CheckArgsConstructor<_Dummy>::template __enable_default<_Tp...>() 615 >::type> 616 _LIBCPP_INLINE_VISIBILITY 617 _LIBCPP_CONSTEXPR tuple() 618 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 619 620 tuple(tuple const&) = default; 621 tuple(tuple&&) = default; 622 623 template <class _AllocArgT, class _Alloc, bool _Dummy = true, class = typename enable_if< 624 __lazy_and< 625 is_same<allocator_arg_t, _AllocArgT>, 626 __lazy_all<__dependent_type<is_default_constructible<_Tp>, _Dummy>...> 627 >::value 628 >::type> 629 _LIBCPP_INLINE_VISIBILITY 630 tuple(_AllocArgT, _Alloc const& __a) 631 : __base_(allocator_arg_t(), __a, 632 __tuple_indices<>(), __tuple_types<>(), 633 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(), 634 __tuple_types<_Tp...>()) {} 635 636 template <bool _Dummy = true, 637 typename enable_if 638 < 639 _CheckArgsConstructor< 640 _Dummy 641 >::template __enable_implicit<_Tp const&...>(), 642 bool 643 >::type = false 644 > 645 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 646 tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 647 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 648 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 649 typename __make_tuple_indices<0>::type(), 650 typename __make_tuple_types<tuple, 0>::type(), 651 __t... 652 ) {} 653 654 template <bool _Dummy = true, 655 typename enable_if 656 < 657 _CheckArgsConstructor< 658 _Dummy 659 >::template __enable_explicit<_Tp const&...>(), 660 bool 661 >::type = false 662 > 663 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 664 explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 665 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 666 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 667 typename __make_tuple_indices<0>::type(), 668 typename __make_tuple_types<tuple, 0>::type(), 669 __t... 670 ) {} 671 672 template <class _Alloc, bool _Dummy = true, 673 typename enable_if 674 < 675 _CheckArgsConstructor< 676 _Dummy 677 >::template __enable_implicit<_Tp const&...>(), 678 bool 679 >::type = false 680 > 681 _LIBCPP_INLINE_VISIBILITY 682 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 683 : __base_(allocator_arg_t(), __a, 684 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 685 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 686 typename __make_tuple_indices<0>::type(), 687 typename __make_tuple_types<tuple, 0>::type(), 688 __t... 689 ) {} 690 691 template <class _Alloc, bool _Dummy = true, 692 typename enable_if 693 < 694 _CheckArgsConstructor< 695 _Dummy 696 >::template __enable_explicit<_Tp const&...>(), 697 bool 698 >::type = false 699 > 700 _LIBCPP_INLINE_VISIBILITY 701 explicit 702 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 703 : __base_(allocator_arg_t(), __a, 704 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 705 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 706 typename __make_tuple_indices<0>::type(), 707 typename __make_tuple_types<tuple, 0>::type(), 708 __t... 709 ) {} 710 711 template <class ..._Up, 712 bool _PackIsTuple = _PackExpandsToThisTuple<_Up...>::value, 713 typename enable_if 714 < 715 _CheckArgsConstructor< 716 sizeof...(_Up) == sizeof...(_Tp) 717 && !_PackIsTuple 718 >::template __enable_implicit<_Up...>() || 719 _CheckArgsConstructor< 720 _EnableImplicitReducedArityExtension 721 && sizeof...(_Up) < sizeof...(_Tp) 722 && !_PackIsTuple 723 >::template __enable_implicit<_Up...>(), 724 bool 725 >::type = false 726 > 727 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 728 tuple(_Up&&... __u) 729 _NOEXCEPT_(( 730 is_nothrow_constructible<_BaseT, 731 typename __make_tuple_indices<sizeof...(_Up)>::type, 732 typename __make_tuple_types<tuple, sizeof...(_Up)>::type, 733 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type, 734 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type, 735 _Up... 736 >::value 737 )) 738 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 739 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 740 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 741 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 742 _VSTD::forward<_Up>(__u)...) {} 743 744 template <class ..._Up, 745 typename enable_if 746 < 747 _CheckArgsConstructor< 748 sizeof...(_Up) <= sizeof...(_Tp) 749 && !_PackExpandsToThisTuple<_Up...>::value 750 >::template __enable_explicit<_Up...>() || 751 _CheckArgsConstructor< 752 !_EnableImplicitReducedArityExtension 753 && sizeof...(_Up) < sizeof...(_Tp) 754 && !_PackExpandsToThisTuple<_Up...>::value 755 >::template __enable_implicit<_Up...>(), 756 bool 757 >::type = false 758 > 759 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 760 explicit 761 tuple(_Up&&... __u) 762 _NOEXCEPT_(( 763 is_nothrow_constructible<_BaseT, 764 typename __make_tuple_indices<sizeof...(_Up)>::type, 765 typename __make_tuple_types<tuple, sizeof...(_Up)>::type, 766 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type, 767 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type, 768 _Up... 769 >::value 770 )) 771 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 772 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 773 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 774 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 775 _VSTD::forward<_Up>(__u)...) {} 776 777 template <class _Alloc, class ..._Up, 778 typename enable_if 779 < 780 _CheckArgsConstructor< 781 sizeof...(_Up) == sizeof...(_Tp) && 782 !_PackExpandsToThisTuple<_Up...>::value 783 >::template __enable_implicit<_Up...>(), 784 bool 785 >::type = false 786 > 787 _LIBCPP_INLINE_VISIBILITY 788 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 789 : __base_(allocator_arg_t(), __a, 790 typename __make_tuple_indices<sizeof...(_Up)>::type(), 791 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 792 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 793 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 794 _VSTD::forward<_Up>(__u)...) {} 795 796 template <class _Alloc, class ..._Up, 797 typename enable_if 798 < 799 _CheckArgsConstructor< 800 sizeof...(_Up) == sizeof...(_Tp) && 801 !_PackExpandsToThisTuple<_Up...>::value 802 >::template __enable_explicit<_Up...>(), 803 bool 804 >::type = false 805 > 806 _LIBCPP_INLINE_VISIBILITY 807 explicit 808 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 809 : __base_(allocator_arg_t(), __a, 810 typename __make_tuple_indices<sizeof...(_Up)>::type(), 811 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 812 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 813 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 814 _VSTD::forward<_Up>(__u)...) {} 815 816 template <class _Tuple, 817 typename enable_if 818 < 819 _CheckTupleLikeConstructor< 820 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 821 && !_PackExpandsToThisTuple<_Tuple>::value 822 >::template __enable_implicit<_Tuple>(), 823 bool 824 >::type = false 825 > 826 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 827 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, _Tuple>::value)) 828 : __base_(_VSTD::forward<_Tuple>(__t)) {} 829 830 template <class _Tuple, 831 typename enable_if 832 < 833 _CheckTupleLikeConstructor< 834 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 835 && !_PackExpandsToThisTuple<_Tuple>::value 836 >::template __enable_explicit<_Tuple>(), 837 bool 838 >::type = false 839 > 840 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 841 explicit 842 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, _Tuple>::value)) 843 : __base_(_VSTD::forward<_Tuple>(__t)) {} 844 845 template <class _Alloc, class _Tuple, 846 typename enable_if 847 < 848 _CheckTupleLikeConstructor< 849 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 850 >::template __enable_implicit<_Tuple>(), 851 bool 852 >::type = false 853 > 854 _LIBCPP_INLINE_VISIBILITY 855 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 856 : __base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {} 857 858 template <class _Alloc, class _Tuple, 859 typename enable_if 860 < 861 _CheckTupleLikeConstructor< 862 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value 863 >::template __enable_explicit<_Tuple>(), 864 bool 865 >::type = false 866 > 867 _LIBCPP_INLINE_VISIBILITY 868 explicit 869 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 870 : __base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {} 871 872 using _CanCopyAssign = __all<is_copy_assignable<_Tp>::value...>; 873 using _CanMoveAssign = __all<is_move_assignable<_Tp>::value...>; 874 875 _LIBCPP_INLINE_VISIBILITY 876 tuple& operator=(typename conditional<_CanCopyAssign::value, tuple, __nat>::type const& __t) 877 _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value)) 878 { 879 __base_.operator=(__t.__base_); 880 return *this; 881 } 882 883 _LIBCPP_INLINE_VISIBILITY 884 tuple& operator=(typename conditional<_CanMoveAssign::value, tuple, __nat>::type&& __t) 885 _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value)) 886 { 887 __base_.operator=(static_cast<_BaseT&&>(__t.__base_)); 888 return *this; 889 } 890 891 template <class _Tuple, 892 class = typename enable_if 893 < 894 __tuple_assignable<_Tuple, tuple>::value 895 >::type 896 > 897 _LIBCPP_INLINE_VISIBILITY 898 tuple& 899 operator=(_Tuple&& __t) _NOEXCEPT_((is_nothrow_assignable<_BaseT&, _Tuple>::value)) 900 { 901 __base_.operator=(_VSTD::forward<_Tuple>(__t)); 902 return *this; 903 } 904 905 _LIBCPP_INLINE_VISIBILITY 906 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 907 {__base_.swap(__t.__base_);} 908}; 909 910template <> 911class _LIBCPP_TEMPLATE_VIS tuple<> 912{ 913public: 914 _LIBCPP_INLINE_VISIBILITY 915 _LIBCPP_CONSTEXPR tuple() _NOEXCEPT {} 916 template <class _Alloc> 917 _LIBCPP_INLINE_VISIBILITY 918 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 919 template <class _Alloc> 920 _LIBCPP_INLINE_VISIBILITY 921 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 922 template <class _Up> 923 _LIBCPP_INLINE_VISIBILITY 924 tuple(array<_Up, 0>) _NOEXCEPT {} 925 template <class _Alloc, class _Up> 926 _LIBCPP_INLINE_VISIBILITY 927 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 928 _LIBCPP_INLINE_VISIBILITY 929 void swap(tuple&) _NOEXCEPT {} 930}; 931 932#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES 933// NOTE: These are not yet standardized, but are required to simulate the 934// implicit deduction guide that should be generated had libc++ declared the 935// tuple-like constructors "correctly" 936template <class _Alloc, class ..._Args> 937tuple(allocator_arg_t, const _Alloc&, tuple<_Args...> const&) -> tuple<_Args...>; 938template <class _Alloc, class ..._Args> 939tuple(allocator_arg_t, const _Alloc&, tuple<_Args...>&&) -> tuple<_Args...>; 940#endif 941 942template <class ..._Tp> 943inline _LIBCPP_INLINE_VISIBILITY 944typename enable_if 945< 946 __all<__is_swappable<_Tp>::value...>::value, 947 void 948>::type 949swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 950 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 951 {__t.swap(__u);} 952 953// get 954 955template <size_t _Ip, class ..._Tp> 956inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 957typename tuple_element<_Ip, tuple<_Tp...> >::type& 958get(tuple<_Tp...>& __t) _NOEXCEPT 959{ 960 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 961 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); 962} 963 964template <size_t _Ip, class ..._Tp> 965inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 966const typename tuple_element<_Ip, tuple<_Tp...> >::type& 967get(const tuple<_Tp...>& __t) _NOEXCEPT 968{ 969 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 970 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); 971} 972 973template <size_t _Ip, class ..._Tp> 974inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 975typename tuple_element<_Ip, tuple<_Tp...> >::type&& 976get(tuple<_Tp...>&& __t) _NOEXCEPT 977{ 978 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 979 return static_cast<type&&>( 980 static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 981} 982 983template <size_t _Ip, class ..._Tp> 984inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 985const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 986get(const tuple<_Tp...>&& __t) _NOEXCEPT 987{ 988 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 989 return static_cast<const type&&>( 990 static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get()); 991} 992 993#if _LIBCPP_STD_VER > 11 994 995namespace __find_detail { 996 997static constexpr size_t __not_found = -1; 998static constexpr size_t __ambiguous = __not_found - 1; 999 1000inline _LIBCPP_INLINE_VISIBILITY 1001constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { 1002 return !__matches ? __res : 1003 (__res == __not_found ? __curr_i : __ambiguous); 1004} 1005 1006template <size_t _Nx> 1007inline _LIBCPP_INLINE_VISIBILITY 1008constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { 1009 return __i == _Nx ? __not_found : 1010 __find_idx_return(__i, __find_idx(__i + 1, __matches), __matches[__i]); 1011} 1012 1013template <class _T1, class ..._Args> 1014struct __find_exactly_one_checked { 1015 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; 1016 static constexpr size_t value = __find_detail::__find_idx(0, __matches); 1017 static_assert(value != __not_found, "type not found in type list" ); 1018 static_assert(value != __ambiguous, "type occurs more than once in type list"); 1019}; 1020 1021template <class _T1> 1022struct __find_exactly_one_checked<_T1> { 1023 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); 1024}; 1025 1026} // namespace __find_detail; 1027 1028template <typename _T1, typename... _Args> 1029struct __find_exactly_one_t 1030 : public __find_detail::__find_exactly_one_checked<_T1, _Args...> { 1031}; 1032 1033template <class _T1, class... _Args> 1034inline _LIBCPP_INLINE_VISIBILITY 1035constexpr _T1& get(tuple<_Args...>& __tup) noexcept 1036{ 1037 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1038} 1039 1040template <class _T1, class... _Args> 1041inline _LIBCPP_INLINE_VISIBILITY 1042constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept 1043{ 1044 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 1045} 1046 1047template <class _T1, class... _Args> 1048inline _LIBCPP_INLINE_VISIBILITY 1049constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept 1050{ 1051 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1052} 1053 1054template <class _T1, class... _Args> 1055inline _LIBCPP_INLINE_VISIBILITY 1056constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept 1057{ 1058 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 1059} 1060 1061#endif 1062 1063// tie 1064 1065template <class ..._Tp> 1066inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1067tuple<_Tp&...> 1068tie(_Tp&... __t) _NOEXCEPT 1069{ 1070 return tuple<_Tp&...>(__t...); 1071} 1072 1073template <class _Up> 1074struct __ignore_t 1075{ 1076 template <class _Tp> 1077 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1078 const __ignore_t& operator=(_Tp&&) const {return *this;} 1079}; 1080 1081namespace { 1082 _LIBCPP_INLINE_VAR constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); 1083} 1084 1085template <class _Tp> 1086struct __make_tuple_return_impl 1087{ 1088 typedef _Tp type; 1089}; 1090 1091template <class _Tp> 1092struct __make_tuple_return_impl<reference_wrapper<_Tp> > 1093{ 1094 typedef _Tp& type; 1095}; 1096 1097template <class _Tp> 1098struct __make_tuple_return 1099{ 1100 typedef typename __make_tuple_return_impl<typename decay<_Tp>::type>::type type; 1101}; 1102 1103template <class... _Tp> 1104inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1105tuple<typename __make_tuple_return<_Tp>::type...> 1106make_tuple(_Tp&&... __t) 1107{ 1108 return tuple<typename __make_tuple_return<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...); 1109} 1110 1111template <class... _Tp> 1112inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1113tuple<_Tp&&...> 1114forward_as_tuple(_Tp&&... __t) _NOEXCEPT 1115{ 1116 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...); 1117} 1118 1119template <size_t _Ip> 1120struct __tuple_equal 1121{ 1122 template <class _Tp, class _Up> 1123 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1124 bool operator()(const _Tp& __x, const _Up& __y) 1125 { 1126 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y); 1127 } 1128}; 1129 1130template <> 1131struct __tuple_equal<0> 1132{ 1133 template <class _Tp, class _Up> 1134 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1135 bool operator()(const _Tp&, const _Up&) 1136 { 1137 return true; 1138 } 1139}; 1140 1141template <class ..._Tp, class ..._Up> 1142inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1143bool 1144operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1145{ 1146 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 1147} 1148 1149template <class ..._Tp, class ..._Up> 1150inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1151bool 1152operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1153{ 1154 return !(__x == __y); 1155} 1156 1157template <size_t _Ip> 1158struct __tuple_less 1159{ 1160 template <class _Tp, class _Up> 1161 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1162 bool operator()(const _Tp& __x, const _Up& __y) 1163 { 1164 const size_t __idx = tuple_size<_Tp>::value - _Ip; 1165 if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y)) 1166 return true; 1167 if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x)) 1168 return false; 1169 return __tuple_less<_Ip-1>()(__x, __y); 1170 } 1171}; 1172 1173template <> 1174struct __tuple_less<0> 1175{ 1176 template <class _Tp, class _Up> 1177 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1178 bool operator()(const _Tp&, const _Up&) 1179 { 1180 return false; 1181 } 1182}; 1183 1184template <class ..._Tp, class ..._Up> 1185inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1186bool 1187operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1188{ 1189 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 1190} 1191 1192template <class ..._Tp, class ..._Up> 1193inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1194bool 1195operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1196{ 1197 return __y < __x; 1198} 1199 1200template <class ..._Tp, class ..._Up> 1201inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1202bool 1203operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1204{ 1205 return !(__x < __y); 1206} 1207 1208template <class ..._Tp, class ..._Up> 1209inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1210bool 1211operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 1212{ 1213 return !(__y < __x); 1214} 1215 1216// tuple_cat 1217 1218template <class _Tp, class _Up> struct __tuple_cat_type; 1219 1220template <class ..._Ttypes, class ..._Utypes> 1221struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > 1222{ 1223 typedef tuple<_Ttypes..., _Utypes...> type; 1224}; 1225 1226template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples> 1227struct __tuple_cat_return_1 1228{ 1229}; 1230 1231template <class ..._Types, class _Tuple0> 1232struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> 1233{ 1234 typedef typename __tuple_cat_type<tuple<_Types...>, 1235 typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type>::type 1236 type; 1237}; 1238 1239template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples> 1240struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1241 : public __tuple_cat_return_1< 1242 typename __tuple_cat_type< 1243 tuple<_Types...>, 1244 typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type 1245 >::type, 1246 __tuple_like<typename remove_reference<_Tuple1>::type>::value, 1247 _Tuple1, _Tuples...> 1248{ 1249}; 1250 1251template <class ..._Tuples> struct __tuple_cat_return; 1252 1253template <class _Tuple0, class ..._Tuples> 1254struct __tuple_cat_return<_Tuple0, _Tuples...> 1255 : public __tuple_cat_return_1<tuple<>, 1256 __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0, 1257 _Tuples...> 1258{ 1259}; 1260 1261template <> 1262struct __tuple_cat_return<> 1263{ 1264 typedef tuple<> type; 1265}; 1266 1267inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1268tuple<> 1269tuple_cat() 1270{ 1271 return tuple<>(); 1272} 1273 1274template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples> 1275struct __tuple_cat_return_ref_imp; 1276 1277template <class ..._Types, size_t ..._I0, class _Tuple0> 1278struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> 1279{ 1280 typedef typename remove_reference<_Tuple0>::type _T0; 1281 typedef tuple<_Types..., typename __apply_cv<_Tuple0, 1282 typename tuple_element<_I0, _T0>::type>::type&&...> type; 1283}; 1284 1285template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples> 1286struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, 1287 _Tuple0, _Tuple1, _Tuples...> 1288 : public __tuple_cat_return_ref_imp< 1289 tuple<_Types..., typename __apply_cv<_Tuple0, 1290 typename tuple_element<_I0, 1291 typename remove_reference<_Tuple0>::type>::type>::type&&...>, 1292 typename __make_tuple_indices<tuple_size<typename 1293 remove_reference<_Tuple1>::type>::value>::type, 1294 _Tuple1, _Tuples...> 1295{ 1296}; 1297 1298template <class _Tuple0, class ..._Tuples> 1299struct __tuple_cat_return_ref 1300 : public __tuple_cat_return_ref_imp<tuple<>, 1301 typename __make_tuple_indices< 1302 tuple_size<typename remove_reference<_Tuple0>::type>::value 1303 >::type, _Tuple0, _Tuples...> 1304{ 1305}; 1306 1307template <class _Types, class _I0, class _J0> 1308struct __tuple_cat; 1309 1310template <class ..._Types, size_t ..._I0, size_t ..._J0> 1311struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > 1312{ 1313 template <class _Tuple0> 1314 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1315 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1316 operator()(tuple<_Types...> __t, _Tuple0&& __t0) 1317 { 1318 return forward_as_tuple(_VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1319 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...); 1320 } 1321 1322 template <class _Tuple0, class _Tuple1, class ..._Tuples> 1323 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1324 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1325 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls) 1326 { 1327 typedef typename remove_reference<_Tuple0>::type _T0; 1328 typedef typename remove_reference<_Tuple1>::type _T1; 1329 return __tuple_cat< 1330 tuple<_Types..., typename __apply_cv<_Tuple0, typename tuple_element<_J0, _T0>::type>::type&&...>, 1331 typename __make_tuple_indices<sizeof ...(_Types) + tuple_size<_T0>::value>::type, 1332 typename __make_tuple_indices<tuple_size<_T1>::value>::type>() 1333 (forward_as_tuple( 1334 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1335 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))... 1336 ), 1337 _VSTD::forward<_Tuple1>(__t1), 1338 _VSTD::forward<_Tuples>(__tpls)...); 1339 } 1340}; 1341 1342template <class _Tuple0, class... _Tuples> 1343inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1344typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1345tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) 1346{ 1347 typedef typename remove_reference<_Tuple0>::type _T0; 1348 return __tuple_cat<tuple<>, __tuple_indices<>, 1349 typename __make_tuple_indices<tuple_size<_T0>::value>::type>() 1350 (tuple<>(), _VSTD::forward<_Tuple0>(__t0), 1351 _VSTD::forward<_Tuples>(__tpls)...); 1352} 1353 1354template <class ..._Tp, class _Alloc> 1355struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> 1356 : true_type {}; 1357 1358template <class _T1, class _T2> 1359template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2> 1360inline _LIBCPP_INLINE_VISIBILITY 1361pair<_T1, _T2>::pair(piecewise_construct_t, 1362 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 1363 __tuple_indices<_I1...>, __tuple_indices<_I2...>) 1364 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...), 1365 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...) 1366{ 1367} 1368 1369#if _LIBCPP_STD_VER > 14 1370template <class _Tp> 1371_LIBCPP_INLINE_VAR constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 1372 1373#define _LIBCPP_NOEXCEPT_RETURN(...) noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; } 1374 1375template <class _Fn, class _Tuple, size_t ..._Id> 1376inline _LIBCPP_INLINE_VISIBILITY 1377constexpr decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, 1378 __tuple_indices<_Id...>) 1379_LIBCPP_NOEXCEPT_RETURN( 1380 _VSTD::__invoke_constexpr( 1381 _VSTD::forward<_Fn>(__f), 1382 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...) 1383) 1384 1385template <class _Fn, class _Tuple> 1386inline _LIBCPP_INLINE_VISIBILITY 1387constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t) 1388_LIBCPP_NOEXCEPT_RETURN( 1389 _VSTD::__apply_tuple_impl( 1390 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), 1391 typename __make_tuple_indices<tuple_size_v<decay_t<_Tuple>>>::type{}) 1392) 1393 1394template <class _Tp, class _Tuple, size_t... _Idx> 1395inline _LIBCPP_INLINE_VISIBILITY 1396constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) 1397_LIBCPP_NOEXCEPT_RETURN( 1398 _Tp(_VSTD::get<_Idx>(_VSTD::forward<_Tuple>(__t))...) 1399) 1400 1401template <class _Tp, class _Tuple> 1402inline _LIBCPP_INLINE_VISIBILITY 1403constexpr _Tp make_from_tuple(_Tuple&& __t) 1404_LIBCPP_NOEXCEPT_RETURN( 1405 _VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t), 1406 typename __make_tuple_indices<tuple_size_v<decay_t<_Tuple>>>::type{}) 1407) 1408 1409#undef _LIBCPP_NOEXCEPT_RETURN 1410 1411#endif // _LIBCPP_STD_VER > 14 1412 1413#endif // !defined(_LIBCPP_CXX03_LANG) 1414 1415_LIBCPP_END_NAMESPACE_STD 1416 1417#endif // _LIBCPP_TUPLE 1418