tuple revision 276792
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 73const 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// 20.4.1.4, tuple helper classes: 81template <class T> class tuple_size; // undefined 82template <class... T> class tuple_size<tuple<T...>>; 83template <intsize_t I, class T> class tuple_element; // undefined 84template <intsize_t I, class... T> class tuple_element<I, tuple<T...>>; 85template <size_t _Ip, class ..._Tp> 86 using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type; // C++14 87 88// 20.4.1.5, element access: 89template <intsize_t I, class... T> 90 typename tuple_element<I, tuple<T...>>::type& 91 get(tuple<T...>&) noexcept; // constexpr in C++14 92template <intsize_t I, class... T> 93 typename const tuple_element<I, tuple<T...>>::type & 94 get(const tuple<T...>&) noexcept; // constexpr in C++14 95template <intsize_t I, class... T> 96 typename tuple_element<I, tuple<T...>>::type&& 97 get(tuple<T...>&&) noexcept; // constexpr in C++14 98 99template <class T1, class... T> 100 constexpr T1& get(tuple<T...>&) noexcept; // C++14 101template <class T1, class... T> 102 constexpr T1 const& get(const tuple<T...>&) noexcept; // C++14 103template <class T1, class... T> 104 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14 105 106// 20.4.1.6, relational operators: 107template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 108template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 109template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 110template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 111template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 112template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14 113 114template <class... Types, class Alloc> 115 struct uses_allocator<tuple<Types...>, Alloc>; 116 117template <class... Types> 118 void 119 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y))); 120 121} // std 122 123*/ 124 125#include <__config> 126#include <__tuple> 127#include <cstddef> 128#include <type_traits> 129#include <__functional_base> 130#include <utility> 131 132#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 133#pragma GCC system_header 134#endif 135 136_LIBCPP_BEGIN_NAMESPACE_STD 137 138#ifndef _LIBCPP_HAS_NO_VARIADICS 139 140// tuple_size 141 142template <class ..._Tp> 143class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> > 144 : public integral_constant<size_t, sizeof...(_Tp)> 145{ 146}; 147 148// tuple_element 149 150template <size_t _Ip, class ..._Tp> 151class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, tuple<_Tp...> > 152{ 153public: 154 typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type; 155}; 156 157#if _LIBCPP_STD_VER > 11 158template <size_t _Ip, class ..._Tp> 159using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type; 160#endif 161 162// __tuple_leaf 163 164template <size_t _Ip, class _Hp, bool=is_empty<_Hp>::value 165#if __has_feature(is_final) 166 && !__is_final(_Hp) 167#endif 168 > 169class __tuple_leaf; 170 171template <size_t _Ip, class _Hp, bool _Ep> 172inline _LIBCPP_INLINE_VISIBILITY 173void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) 174 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value) 175{ 176 swap(__x.get(), __y.get()); 177} 178 179template <size_t _Ip, class _Hp, bool> 180class __tuple_leaf 181{ 182 _Hp value; 183 184 __tuple_leaf& operator=(const __tuple_leaf&); 185public: 186 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf() 187 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : value() 188 {static_assert(!is_reference<_Hp>::value, 189 "Attempted to default construct a reference element in a tuple");} 190 191 template <class _Alloc> 192 _LIBCPP_INLINE_VISIBILITY 193 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) 194 : value() 195 {static_assert(!is_reference<_Hp>::value, 196 "Attempted to default construct a reference element in a tuple");} 197 198 template <class _Alloc> 199 _LIBCPP_INLINE_VISIBILITY 200 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 201 : value(allocator_arg_t(), __a) 202 {static_assert(!is_reference<_Hp>::value, 203 "Attempted to default construct a reference element in a tuple");} 204 205 template <class _Alloc> 206 _LIBCPP_INLINE_VISIBILITY 207 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 208 : value(__a) 209 {static_assert(!is_reference<_Hp>::value, 210 "Attempted to default construct a reference element in a tuple");} 211 212 template <class _Tp, 213 class = typename enable_if< 214 __lazy_and< 215 __lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>> 216 , is_constructible<_Hp, _Tp> 217 >::value 218 >::type 219 > 220 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 221 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 222 : value(_VSTD::forward<_Tp>(__t)) 223 {static_assert(!is_reference<_Hp>::value || 224 (is_lvalue_reference<_Hp>::value && 225 (is_lvalue_reference<_Tp>::value || 226 is_same<typename remove_reference<_Tp>::type, 227 reference_wrapper< 228 typename remove_reference<_Hp>::type 229 > 230 >::value)) || 231 (is_rvalue_reference<_Hp>::value && 232 !is_lvalue_reference<_Tp>::value), 233 "Attempted to construct a reference element in a tuple with an rvalue");} 234 235 template <class _Tp, class _Alloc> 236 _LIBCPP_INLINE_VISIBILITY 237 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 238 : value(_VSTD::forward<_Tp>(__t)) 239 {static_assert(!is_lvalue_reference<_Hp>::value || 240 (is_lvalue_reference<_Hp>::value && 241 (is_lvalue_reference<_Tp>::value || 242 is_same<typename remove_reference<_Tp>::type, 243 reference_wrapper< 244 typename remove_reference<_Hp>::type 245 > 246 >::value)), 247 "Attempted to construct a reference element in a tuple with an rvalue");} 248 249 template <class _Tp, class _Alloc> 250 _LIBCPP_INLINE_VISIBILITY 251 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 252 : value(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) 253 {static_assert(!is_lvalue_reference<_Hp>::value || 254 (is_lvalue_reference<_Hp>::value && 255 (is_lvalue_reference<_Tp>::value || 256 is_same<typename remove_reference<_Tp>::type, 257 reference_wrapper< 258 typename remove_reference<_Hp>::type 259 > 260 >::value)), 261 "Attempted to construct a reference element in a tuple with an rvalue");} 262 263 template <class _Tp, class _Alloc> 264 _LIBCPP_INLINE_VISIBILITY 265 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 266 : value(_VSTD::forward<_Tp>(__t), __a) 267 {static_assert(!is_lvalue_reference<_Hp>::value || 268 (is_lvalue_reference<_Hp>::value && 269 (is_lvalue_reference<_Tp>::value || 270 is_same<typename remove_reference<_Tp>::type, 271 reference_wrapper< 272 typename remove_reference<_Hp>::type 273 > 274 >::value)), 275 "Attempted to construct a reference element in a tuple with an rvalue");} 276 277 __tuple_leaf(const __tuple_leaf& __t) = default; 278 __tuple_leaf(__tuple_leaf&& __t) = default; 279 280 template <class _Tp> 281 _LIBCPP_INLINE_VISIBILITY 282 __tuple_leaf& 283 operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value)) 284 { 285 value = _VSTD::forward<_Tp>(__t); 286 return *this; 287 } 288 289 _LIBCPP_INLINE_VISIBILITY 290 int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 291 { 292 _VSTD::swap(*this, __t); 293 return 0; 294 } 295 296 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return value;} 297 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return value;} 298}; 299 300template <size_t _Ip, class _Hp> 301class __tuple_leaf<_Ip, _Hp, true> 302 : private _Hp 303{ 304 305 __tuple_leaf& operator=(const __tuple_leaf&); 306public: 307 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf() 308 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {} 309 310 template <class _Alloc> 311 _LIBCPP_INLINE_VISIBILITY 312 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {} 313 314 template <class _Alloc> 315 _LIBCPP_INLINE_VISIBILITY 316 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a) 317 : _Hp(allocator_arg_t(), __a) {} 318 319 template <class _Alloc> 320 _LIBCPP_INLINE_VISIBILITY 321 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) 322 : _Hp(__a) {} 323 324 template <class _Tp, 325 class = typename enable_if< 326 __lazy_and< 327 __lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>> 328 , is_constructible<_Hp, _Tp> 329 >::value 330 >::type 331 > 332 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 333 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value)) 334 : _Hp(_VSTD::forward<_Tp>(__t)) {} 335 336 template <class _Tp, class _Alloc> 337 _LIBCPP_INLINE_VISIBILITY 338 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t) 339 : _Hp(_VSTD::forward<_Tp>(__t)) {} 340 341 template <class _Tp, class _Alloc> 342 _LIBCPP_INLINE_VISIBILITY 343 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t) 344 : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {} 345 346 template <class _Tp, class _Alloc> 347 _LIBCPP_INLINE_VISIBILITY 348 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t) 349 : _Hp(_VSTD::forward<_Tp>(__t), __a) {} 350 351 __tuple_leaf(__tuple_leaf const &) = default; 352 __tuple_leaf(__tuple_leaf &&) = default; 353 354 template <class _Tp> 355 _LIBCPP_INLINE_VISIBILITY 356 __tuple_leaf& 357 operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value)) 358 { 359 _Hp::operator=(_VSTD::forward<_Tp>(__t)); 360 return *this; 361 } 362 363 _LIBCPP_INLINE_VISIBILITY 364 int 365 swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value) 366 { 367 _VSTD::swap(*this, __t); 368 return 0; 369 } 370 371 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);} 372 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);} 373}; 374 375template <class ..._Tp> 376_LIBCPP_INLINE_VISIBILITY 377void __swallow(_Tp&&...) _NOEXCEPT {} 378 379template <bool ..._Pred> 380struct __all 381 : is_same<__all<_Pred...>, __all<(_Pred, true)...>> 382{ }; 383 384template <class _Tp> 385struct __all_default_constructible; 386 387template <class ..._Tp> 388struct __all_default_constructible<__tuple_types<_Tp...>> 389 : __all<is_default_constructible<_Tp>::value...> 390{ }; 391 392// __tuple_impl 393 394template<class _Indx, class ..._Tp> struct __tuple_impl; 395 396template<size_t ..._Indx, class ..._Tp> 397struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...> 398 : public __tuple_leaf<_Indx, _Tp>... 399{ 400 _LIBCPP_INLINE_VISIBILITY 401 _LIBCPP_CONSTEXPR __tuple_impl() 402 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 403 404 template <size_t ..._Uf, class ..._Tf, 405 size_t ..._Ul, class ..._Tl, class ..._Up> 406 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 407 explicit 408 __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>, 409 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 410 _Up&&... __u) 411 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value && 412 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) : 413 __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))..., 414 __tuple_leaf<_Ul, _Tl>()... 415 {} 416 417 template <class _Alloc, size_t ..._Uf, class ..._Tf, 418 size_t ..._Ul, class ..._Tl, class ..._Up> 419 _LIBCPP_INLINE_VISIBILITY 420 explicit 421 __tuple_impl(allocator_arg_t, const _Alloc& __a, 422 __tuple_indices<_Uf...>, __tuple_types<_Tf...>, 423 __tuple_indices<_Ul...>, __tuple_types<_Tl...>, 424 _Up&&... __u) : 425 __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, 426 _VSTD::forward<_Up>(__u))..., 427 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... 428 {} 429 430 template <class _Tuple, 431 class = typename enable_if 432 < 433 __tuple_constructible<_Tuple, tuple<_Tp...> >::value 434 >::type 435 > 436 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 437 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx, 438 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 439 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx, 440 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 441 {} 442 443 template <class _Alloc, class _Tuple, 444 class = typename enable_if 445 < 446 __tuple_convertible<_Tuple, tuple<_Tp...> >::value 447 >::type 448 > 449 _LIBCPP_INLINE_VISIBILITY 450 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 451 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx, 452 typename __make_tuple_types<_Tuple>::type>::type>(), __a, 453 _VSTD::forward<typename tuple_element<_Indx, 454 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))... 455 {} 456 457 template <class _Tuple> 458 _LIBCPP_INLINE_VISIBILITY 459 typename enable_if 460 < 461 __tuple_assignable<_Tuple, tuple<_Tp...> >::value, 462 __tuple_impl& 463 >::type 464 operator=(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_assignable<_Tp&, typename tuple_element<_Indx, 465 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value)) 466 { 467 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<typename tuple_element<_Indx, 468 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...); 469 return *this; 470 } 471 472 __tuple_impl(const __tuple_impl&) = default; 473 __tuple_impl(__tuple_impl&&) = default; 474 475 _LIBCPP_INLINE_VISIBILITY 476 __tuple_impl& 477 operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value)) 478 { 479 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...); 480 return *this; 481 } 482 483 _LIBCPP_INLINE_VISIBILITY 484 __tuple_impl& 485 operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value)) 486 { 487 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...); 488 return *this; 489 } 490 491 _LIBCPP_INLINE_VISIBILITY 492 void swap(__tuple_impl& __t) 493 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 494 { 495 __swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...); 496 } 497}; 498 499template <class ..._Tp> 500class _LIBCPP_TYPE_VIS_ONLY tuple 501{ 502 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> base; 503 504 base base_; 505 506 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 507 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT; 508 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 509 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT; 510 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11 511 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT; 512public: 513 514 template <bool _Dummy = true, class _Up = typename enable_if< 515 __all<(_Dummy && is_default_constructible<_Tp>::value)...>::value 516 >::type> 517 _LIBCPP_INLINE_VISIBILITY 518 _LIBCPP_CONSTEXPR tuple() 519 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {} 520 521 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 522 explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 523 : base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(), 524 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 525 typename __make_tuple_indices<0>::type(), 526 typename __make_tuple_types<tuple, 0>::type(), 527 __t... 528 ) {} 529 530 template <class _Alloc> 531 _LIBCPP_INLINE_VISIBILITY 532 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t) 533 : base_(allocator_arg_t(), __a, 534 typename __make_tuple_indices<sizeof...(_Tp)>::type(), 535 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(), 536 typename __make_tuple_indices<0>::type(), 537 typename __make_tuple_types<tuple, 0>::type(), 538 __t... 539 ) {} 540 541 template <class ..._Up, 542 typename enable_if 543 < 544 sizeof...(_Up) <= sizeof...(_Tp) && 545 __tuple_convertible 546 < 547 tuple<_Up...>, 548 typename __make_tuple_types<tuple, 549 sizeof...(_Up) < sizeof...(_Tp) ? 550 sizeof...(_Up) : 551 sizeof...(_Tp)>::type 552 >::value && 553 __all_default_constructible< 554 typename __make_tuple_types<tuple, sizeof...(_Tp), 555 sizeof...(_Up) < sizeof...(_Tp) ? 556 sizeof...(_Up) : 557 sizeof...(_Tp)>::type 558 >::value, 559 bool 560 >::type = false 561 > 562 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 563 tuple(_Up&&... __u) 564 _NOEXCEPT_(( 565 is_nothrow_constructible<base, 566 typename __make_tuple_indices<sizeof...(_Up)>::type, 567 typename __make_tuple_types<tuple, sizeof...(_Up)>::type, 568 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type, 569 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type, 570 _Up... 571 >::value 572 )) 573 : base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 574 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 575 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 576 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 577 _VSTD::forward<_Up>(__u)...) {} 578 579 template <class ..._Up, 580 typename enable_if 581 < 582 sizeof...(_Up) <= sizeof...(_Tp) && 583 __tuple_constructible 584 < 585 tuple<_Up...>, 586 typename __make_tuple_types<tuple, 587 sizeof...(_Up) < sizeof...(_Tp) ? 588 sizeof...(_Up) : 589 sizeof...(_Tp)>::type 590 >::value && 591 !__tuple_convertible 592 < 593 tuple<_Up...>, 594 typename __make_tuple_types<tuple, 595 sizeof...(_Up) < sizeof...(_Tp) ? 596 sizeof...(_Up) : 597 sizeof...(_Tp)>::type 598 >::value && 599 __all_default_constructible< 600 typename __make_tuple_types<tuple, sizeof...(_Tp), 601 sizeof...(_Up) < sizeof...(_Tp) ? 602 sizeof...(_Up) : 603 sizeof...(_Tp)>::type 604 >::value, 605 bool 606 >::type =false 607 > 608 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 609 explicit 610 tuple(_Up&&... __u) 611 _NOEXCEPT_(( 612 is_nothrow_constructible<base, 613 typename __make_tuple_indices<sizeof...(_Up)>::type, 614 typename __make_tuple_types<tuple, sizeof...(_Up)>::type, 615 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type, 616 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type, 617 _Up... 618 >::value 619 )) 620 : base_(typename __make_tuple_indices<sizeof...(_Up)>::type(), 621 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 622 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 623 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 624 _VSTD::forward<_Up>(__u)...) {} 625 626 template <class _Alloc, class ..._Up, 627 class = typename enable_if 628 < 629 sizeof...(_Up) <= sizeof...(_Tp) && 630 __tuple_convertible 631 < 632 tuple<_Up...>, 633 typename __make_tuple_types<tuple, 634 sizeof...(_Up) < sizeof...(_Tp) ? 635 sizeof...(_Up) : 636 sizeof...(_Tp)>::type 637 >::value && 638 __all_default_constructible< 639 typename __make_tuple_types<tuple, sizeof...(_Tp), 640 sizeof...(_Up) < sizeof...(_Tp) ? 641 sizeof...(_Up) : 642 sizeof...(_Tp)>::type 643 >::value 644 >::type 645 > 646 _LIBCPP_INLINE_VISIBILITY 647 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u) 648 : base_(allocator_arg_t(), __a, 649 typename __make_tuple_indices<sizeof...(_Up)>::type(), 650 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(), 651 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(), 652 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(), 653 _VSTD::forward<_Up>(__u)...) {} 654 655 template <class _Tuple, 656 typename enable_if 657 < 658 __tuple_convertible<_Tuple, tuple>::value, 659 bool 660 >::type = false 661 > 662 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 663 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value)) 664 : base_(_VSTD::forward<_Tuple>(__t)) {} 665 666 template <class _Tuple, 667 typename enable_if 668 < 669 __tuple_constructible<_Tuple, tuple>::value && 670 !__tuple_convertible<_Tuple, tuple>::value, 671 bool 672 >::type = false 673 > 674 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 675 explicit 676 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value)) 677 : base_(_VSTD::forward<_Tuple>(__t)) {} 678 679 template <class _Alloc, class _Tuple, 680 class = typename enable_if 681 < 682 __tuple_convertible<_Tuple, tuple>::value 683 >::type 684 > 685 _LIBCPP_INLINE_VISIBILITY 686 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t) 687 : base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {} 688 689 template <class _Tuple, 690 class = typename enable_if 691 < 692 __tuple_assignable<_Tuple, tuple>::value 693 >::type 694 > 695 _LIBCPP_INLINE_VISIBILITY 696 tuple& 697 operator=(_Tuple&& __t) _NOEXCEPT_((is_nothrow_assignable<base&, _Tuple>::value)) 698 { 699 base_.operator=(_VSTD::forward<_Tuple>(__t)); 700 return *this; 701 } 702 703 _LIBCPP_INLINE_VISIBILITY 704 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 705 {base_.swap(__t.base_);} 706}; 707 708template <> 709class _LIBCPP_TYPE_VIS_ONLY tuple<> 710{ 711public: 712 _LIBCPP_INLINE_VISIBILITY 713 _LIBCPP_CONSTEXPR tuple() _NOEXCEPT {} 714 template <class _Alloc> 715 _LIBCPP_INLINE_VISIBILITY 716 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {} 717 template <class _Alloc> 718 _LIBCPP_INLINE_VISIBILITY 719 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {} 720 template <class _Up> 721 _LIBCPP_INLINE_VISIBILITY 722 tuple(array<_Up, 0>) _NOEXCEPT {} 723 template <class _Alloc, class _Up> 724 _LIBCPP_INLINE_VISIBILITY 725 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {} 726 _LIBCPP_INLINE_VISIBILITY 727 void swap(tuple&) _NOEXCEPT {} 728}; 729 730template <class ..._Tp> 731inline _LIBCPP_INLINE_VISIBILITY 732typename enable_if 733< 734 __all<__is_swappable<_Tp>::value...>::value, 735 void 736>::type 737swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u) 738 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value) 739 {__t.swap(__u);} 740 741// get 742 743template <size_t _Ip, class ..._Tp> 744inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 745typename tuple_element<_Ip, tuple<_Tp...> >::type& 746get(tuple<_Tp...>& __t) _NOEXCEPT 747{ 748 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 749 return static_cast<__tuple_leaf<_Ip, type>&>(__t.base_).get(); 750} 751 752template <size_t _Ip, class ..._Tp> 753inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 754const typename tuple_element<_Ip, tuple<_Tp...> >::type& 755get(const tuple<_Tp...>& __t) _NOEXCEPT 756{ 757 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 758 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.base_).get(); 759} 760 761template <size_t _Ip, class ..._Tp> 762inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 763typename tuple_element<_Ip, tuple<_Tp...> >::type&& 764get(tuple<_Tp...>&& __t) _NOEXCEPT 765{ 766 typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type; 767 return static_cast<type&&>( 768 static_cast<__tuple_leaf<_Ip, type>&&>(__t.base_).get()); 769} 770 771#if _LIBCPP_STD_VER > 11 772// get by type 773template <typename _T1, size_t _Idx, typename... _Args> 774struct __find_exactly_one_t_helper; 775 776// -- find exactly one 777template <typename _T1, size_t _Idx, typename... _Args> 778struct __find_exactly_one_t_checker { 779 static constexpr size_t value = _Idx; 780// Check the rest of the list to make sure there's only one 781 static_assert ( __find_exactly_one_t_helper<_T1, 0, _Args...>::value == -1, "type can only occur once in type list" ); 782 }; 783 784 785template <typename _T1, size_t _Idx> 786struct __find_exactly_one_t_helper <_T1, _Idx> { 787 static constexpr size_t value = -1; 788 }; 789 790template <typename _T1, size_t _Idx, typename _Head, typename... _Args> 791struct __find_exactly_one_t_helper <_T1, _Idx, _Head, _Args...> { 792 static constexpr size_t value = 793 std::conditional< 794 std::is_same<_T1, _Head>::value, 795 __find_exactly_one_t_checker<_T1, _Idx, _Args...>, 796 __find_exactly_one_t_helper <_T1, _Idx+1, _Args...> 797 >::type::value; 798 }; 799 800template <typename _T1, typename... _Args> 801struct __find_exactly_one_t { 802 static constexpr size_t value = __find_exactly_one_t_helper<_T1, 0, _Args...>::value; 803 static_assert ( value != -1, "type not found in type list" ); 804 }; 805 806template <class _T1, class... _Args> 807inline _LIBCPP_INLINE_VISIBILITY 808constexpr _T1& get(tuple<_Args...>& __tup) noexcept 809{ 810 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 811} 812 813template <class _T1, class... _Args> 814inline _LIBCPP_INLINE_VISIBILITY 815constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept 816{ 817 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup); 818} 819 820template <class _T1, class... _Args> 821inline _LIBCPP_INLINE_VISIBILITY 822constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept 823{ 824 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup)); 825} 826 827#endif 828 829// tie 830 831template <class ..._Tp> 832inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 833tuple<_Tp&...> 834tie(_Tp&... __t) _NOEXCEPT 835{ 836 return tuple<_Tp&...>(__t...); 837} 838 839template <class _Up> 840struct __ignore_t 841{ 842 template <class _Tp> 843 _LIBCPP_INLINE_VISIBILITY 844 const __ignore_t& operator=(_Tp&&) const {return *this;} 845}; 846 847namespace { const __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); } 848 849template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper; 850 851template <class _Tp> 852struct __make_tuple_return_impl 853{ 854 typedef _Tp type; 855}; 856 857template <class _Tp> 858struct __make_tuple_return_impl<reference_wrapper<_Tp> > 859{ 860 typedef _Tp& type; 861}; 862 863template <class _Tp> 864struct __make_tuple_return 865{ 866 typedef typename __make_tuple_return_impl<typename decay<_Tp>::type>::type type; 867}; 868 869template <class... _Tp> 870inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 871tuple<typename __make_tuple_return<_Tp>::type...> 872make_tuple(_Tp&&... __t) 873{ 874 return tuple<typename __make_tuple_return<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...); 875} 876 877template <class... _Tp> 878inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 879tuple<_Tp&&...> 880forward_as_tuple(_Tp&&... __t) _NOEXCEPT 881{ 882 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...); 883} 884 885template <size_t _Ip> 886struct __tuple_equal 887{ 888 template <class _Tp, class _Up> 889 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 890 bool operator()(const _Tp& __x, const _Up& __y) 891 { 892 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y); 893 } 894}; 895 896template <> 897struct __tuple_equal<0> 898{ 899 template <class _Tp, class _Up> 900 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 901 bool operator()(const _Tp&, const _Up&) 902 { 903 return true; 904 } 905}; 906 907template <class ..._Tp, class ..._Up> 908inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 909bool 910operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 911{ 912 return __tuple_equal<sizeof...(_Tp)>()(__x, __y); 913} 914 915template <class ..._Tp, class ..._Up> 916inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 917bool 918operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 919{ 920 return !(__x == __y); 921} 922 923template <size_t _Ip> 924struct __tuple_less 925{ 926 template <class _Tp, class _Up> 927 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 928 bool operator()(const _Tp& __x, const _Up& __y) 929 { 930 return __tuple_less<_Ip-1>()(__x, __y) || 931 (!__tuple_less<_Ip-1>()(__y, __x) && _VSTD::get<_Ip-1>(__x) < _VSTD::get<_Ip-1>(__y)); 932 } 933}; 934 935template <> 936struct __tuple_less<0> 937{ 938 template <class _Tp, class _Up> 939 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 940 bool operator()(const _Tp&, const _Up&) 941 { 942 return false; 943 } 944}; 945 946template <class ..._Tp, class ..._Up> 947inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 948bool 949operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 950{ 951 return __tuple_less<sizeof...(_Tp)>()(__x, __y); 952} 953 954template <class ..._Tp, class ..._Up> 955inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 956bool 957operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 958{ 959 return __y < __x; 960} 961 962template <class ..._Tp, class ..._Up> 963inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 964bool 965operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 966{ 967 return !(__x < __y); 968} 969 970template <class ..._Tp, class ..._Up> 971inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 972bool 973operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) 974{ 975 return !(__y < __x); 976} 977 978// tuple_cat 979 980template <class _Tp, class _Up> struct __tuple_cat_type; 981 982template <class ..._Ttypes, class ..._Utypes> 983struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > 984{ 985 typedef tuple<_Ttypes..., _Utypes...> type; 986}; 987 988template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples> 989struct __tuple_cat_return_1 990{ 991}; 992 993template <class ..._Types, class _Tuple0> 994struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> 995{ 996 typedef typename __tuple_cat_type<tuple<_Types...>, 997 typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type>::type 998 type; 999}; 1000 1001template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples> 1002struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...> 1003 : public __tuple_cat_return_1< 1004 typename __tuple_cat_type< 1005 tuple<_Types...>, 1006 typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type 1007 >::type, 1008 __tuple_like<typename remove_reference<_Tuple1>::type>::value, 1009 _Tuple1, _Tuples...> 1010{ 1011}; 1012 1013template <class ..._Tuples> struct __tuple_cat_return; 1014 1015template <class _Tuple0, class ..._Tuples> 1016struct __tuple_cat_return<_Tuple0, _Tuples...> 1017 : public __tuple_cat_return_1<tuple<>, 1018 __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0, 1019 _Tuples...> 1020{ 1021}; 1022 1023template <> 1024struct __tuple_cat_return<> 1025{ 1026 typedef tuple<> type; 1027}; 1028 1029inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1030tuple<> 1031tuple_cat() 1032{ 1033 return tuple<>(); 1034} 1035 1036template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples> 1037struct __tuple_cat_return_ref_imp; 1038 1039template <class ..._Types, size_t ..._I0, class _Tuple0> 1040struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> 1041{ 1042 typedef typename remove_reference<_Tuple0>::type _T0; 1043 typedef tuple<_Types..., typename __apply_cv<_Tuple0, 1044 typename tuple_element<_I0, _T0>::type>::type&&...> type; 1045}; 1046 1047template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples> 1048struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, 1049 _Tuple0, _Tuple1, _Tuples...> 1050 : public __tuple_cat_return_ref_imp< 1051 tuple<_Types..., typename __apply_cv<_Tuple0, 1052 typename tuple_element<_I0, 1053 typename remove_reference<_Tuple0>::type>::type>::type&&...>, 1054 typename __make_tuple_indices<tuple_size<typename 1055 remove_reference<_Tuple1>::type>::value>::type, 1056 _Tuple1, _Tuples...> 1057{ 1058}; 1059 1060template <class _Tuple0, class ..._Tuples> 1061struct __tuple_cat_return_ref 1062 : public __tuple_cat_return_ref_imp<tuple<>, 1063 typename __make_tuple_indices< 1064 tuple_size<typename remove_reference<_Tuple0>::type>::value 1065 >::type, _Tuple0, _Tuples...> 1066{ 1067}; 1068 1069template <class _Types, class _I0, class _J0> 1070struct __tuple_cat; 1071 1072template <class ..._Types, size_t ..._I0, size_t ..._J0> 1073struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > 1074{ 1075 template <class _Tuple0> 1076 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1077 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type 1078 operator()(tuple<_Types...> __t, _Tuple0&& __t0) 1079 { 1080 return forward_as_tuple(_VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1081 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...); 1082 } 1083 1084 template <class _Tuple0, class _Tuple1, class ..._Tuples> 1085 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1086 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type 1087 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls) 1088 { 1089 typedef typename remove_reference<_Tuple0>::type _T0; 1090 typedef typename remove_reference<_Tuple1>::type _T1; 1091 return __tuple_cat< 1092 tuple<_Types..., typename __apply_cv<_Tuple0, typename tuple_element<_J0, _T0>::type>::type&&...>, 1093 typename __make_tuple_indices<sizeof ...(_Types) + tuple_size<_T0>::value>::type, 1094 typename __make_tuple_indices<tuple_size<_T1>::value>::type>() 1095 (forward_as_tuple( 1096 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))..., 1097 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))... 1098 ), 1099 _VSTD::forward<_Tuple1>(__t1), 1100 _VSTD::forward<_Tuples>(__tpls)...); 1101 } 1102}; 1103 1104template <class _Tuple0, class... _Tuples> 1105inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1106typename __tuple_cat_return<_Tuple0, _Tuples...>::type 1107tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) 1108{ 1109 typedef typename remove_reference<_Tuple0>::type _T0; 1110 return __tuple_cat<tuple<>, __tuple_indices<>, 1111 typename __make_tuple_indices<tuple_size<_T0>::value>::type>() 1112 (tuple<>(), _VSTD::forward<_Tuple0>(__t0), 1113 _VSTD::forward<_Tuples>(__tpls)...); 1114} 1115 1116template <class ..._Tp, class _Alloc> 1117struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<tuple<_Tp...>, _Alloc> 1118 : true_type {}; 1119 1120template <class _T1, class _T2> 1121template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2> 1122inline _LIBCPP_INLINE_VISIBILITY 1123pair<_T1, _T2>::pair(piecewise_construct_t, 1124 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 1125 __tuple_indices<_I1...>, __tuple_indices<_I2...>) 1126 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...), 1127 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...) 1128{ 1129} 1130 1131#endif // _LIBCPP_HAS_NO_VARIADICS 1132 1133_LIBCPP_END_NAMESPACE_STD 1134 1135#endif // _LIBCPP_TUPLE 1136