1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// The LLVM Compiler Infrastructure 5// 6// This file is dual licensed under the MIT and the University of Illinois Open 7// Source Licenses. See LICENSE.TXT for details. 8// 9//===----------------------------------------------------------------------===// 10 11#ifndef _LIBCPP___TUPLE 12#define _LIBCPP___TUPLE 13 14#include <__config> 15#include <cstddef> 16#include <type_traits> 17 18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19#pragma GCC system_header 20#endif 21 22 23_LIBCPP_BEGIN_NAMESPACE_STD 24 25template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size; 26 27#if !defined(_LIBCPP_CXX03_LANG) 28template <class _Tp, class...> 29using __enable_if_tuple_size_imp = _Tp; 30 31template <class _Tp> 32class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< 33 const _Tp, 34 typename enable_if<!is_volatile<_Tp>::value>::type, 35 integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> 36 : public integral_constant<size_t, tuple_size<_Tp>::value> {}; 37 38template <class _Tp> 39class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< 40 volatile _Tp, 41 typename enable_if<!is_const<_Tp>::value>::type, 42 integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> 43 : public integral_constant<size_t, tuple_size<_Tp>::value> {}; 44 45template <class _Tp> 46class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< 47 const volatile _Tp, 48 integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> 49 : public integral_constant<size_t, tuple_size<_Tp>::value> {}; 50 51#else 52template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {}; 53template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {}; 54template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {}; 55#endif 56 57template <size_t _Ip, class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_element; 58 59template <size_t _Ip, class _Tp> 60class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp> 61{ 62public: 63 typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type; 64}; 65 66template <size_t _Ip, class _Tp> 67class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp> 68{ 69public: 70 typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type; 71}; 72 73template <size_t _Ip, class _Tp> 74class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp> 75{ 76public: 77 typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type; 78}; 79 80template <class _Tp> struct __tuple_like : false_type {}; 81 82template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {}; 83template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {}; 84template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {}; 85 86// tuple specializations 87 88#if !defined(_LIBCPP_HAS_NO_VARIADICS) 89 90template <size_t...> struct __tuple_indices {}; 91 92template <class _IdxType, _IdxType... _Values> 93struct __integer_sequence { 94 template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType> 95 using __convert = _ToIndexSeq<_ToIndexType, _Values...>; 96 97 template <size_t _Sp> 98 using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>; 99}; 100 101#if !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE) 102namespace __detail { 103 104template<typename _Tp, size_t ..._Extra> struct __repeat; 105template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> { 106 typedef __integer_sequence<_Tp, 107 _Np..., 108 sizeof...(_Np) + _Np..., 109 2 * sizeof...(_Np) + _Np..., 110 3 * sizeof...(_Np) + _Np..., 111 4 * sizeof...(_Np) + _Np..., 112 5 * sizeof...(_Np) + _Np..., 113 6 * sizeof...(_Np) + _Np..., 114 7 * sizeof...(_Np) + _Np..., 115 _Extra...> type; 116}; 117 118template<size_t _Np> struct __parity; 119template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {}; 120 121template<> struct __make<0> { typedef __integer_sequence<size_t> type; }; 122template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; }; 123template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; }; 124template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; }; 125template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; }; 126template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; }; 127template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; }; 128template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; }; 129 130template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; }; 131template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; }; 132template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; }; 133template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; }; 134template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 135template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 136template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 137template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 138 139} // namespace detail 140 141#endif // !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE) 142 143#if __has_builtin(__make_integer_seq) 144template <size_t _Ep, size_t _Sp> 145using __make_indices_imp = 146 typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template 147 __to_tuple_indices<_Sp>; 148#else 149template <size_t _Ep, size_t _Sp> 150using __make_indices_imp = 151 typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>; 152 153#endif 154 155template <size_t _Ep, size_t _Sp = 0> 156struct __make_tuple_indices 157{ 158 static_assert(_Sp <= _Ep, "__make_tuple_indices input error"); 159 typedef __make_indices_imp<_Ep, _Sp> type; 160}; 161 162 163template <class ..._Tp> class _LIBCPP_TEMPLATE_VIS tuple; 164 165template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {}; 166 167template <class ..._Tp> 168class _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> > 169 : public integral_constant<size_t, sizeof...(_Tp)> 170{ 171}; 172 173template <size_t _Ip, class ..._Tp> 174_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 175typename tuple_element<_Ip, tuple<_Tp...> >::type& 176get(tuple<_Tp...>&) _NOEXCEPT; 177 178template <size_t _Ip, class ..._Tp> 179_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 180const typename tuple_element<_Ip, tuple<_Tp...> >::type& 181get(const tuple<_Tp...>&) _NOEXCEPT; 182 183template <size_t _Ip, class ..._Tp> 184_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 185typename tuple_element<_Ip, tuple<_Tp...> >::type&& 186get(tuple<_Tp...>&&) _NOEXCEPT; 187 188template <size_t _Ip, class ..._Tp> 189_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 190const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 191get(const tuple<_Tp...>&&) _NOEXCEPT; 192#endif 193 194// pair specializations 195 196template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {}; 197 198template <size_t _Ip, class _T1, class _T2> 199_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 200typename tuple_element<_Ip, pair<_T1, _T2> >::type& 201get(pair<_T1, _T2>&) _NOEXCEPT; 202 203template <size_t _Ip, class _T1, class _T2> 204_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 205const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 206get(const pair<_T1, _T2>&) _NOEXCEPT; 207 208#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) 209template <size_t _Ip, class _T1, class _T2> 210_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 211typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 212get(pair<_T1, _T2>&&) _NOEXCEPT; 213 214template <size_t _Ip, class _T1, class _T2> 215_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 216const typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 217get(const pair<_T1, _T2>&&) _NOEXCEPT; 218#endif 219 220// array specializations 221 222template <class _Tp, size_t _Size> struct _LIBCPP_TEMPLATE_VIS array; 223 224template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {}; 225 226template <size_t _Ip, class _Tp, size_t _Size> 227_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 228_Tp& 229get(array<_Tp, _Size>&) _NOEXCEPT; 230 231template <size_t _Ip, class _Tp, size_t _Size> 232_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 233const _Tp& 234get(const array<_Tp, _Size>&) _NOEXCEPT; 235 236#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) 237template <size_t _Ip, class _Tp, size_t _Size> 238_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 239_Tp&& 240get(array<_Tp, _Size>&&) _NOEXCEPT; 241 242template <size_t _Ip, class _Tp, size_t _Size> 243_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 244const _Tp&& 245get(const array<_Tp, _Size>&&) _NOEXCEPT; 246#endif 247 248#if !defined(_LIBCPP_HAS_NO_VARIADICS) 249 250 251// __tuple_types 252 253template <class ..._Tp> struct __tuple_types {}; 254 255#if !__has_builtin(__type_pack_element) 256 257namespace __indexer_detail { 258 259template <size_t _Idx, class _Tp> 260struct __indexed { using type = _Tp; }; 261 262template <class _Types, class _Indexes> struct __indexer; 263 264template <class ..._Types, size_t ..._Idx> 265struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>> 266 : __indexed<_Idx, _Types>... 267{}; 268 269template <size_t _Idx, class _Tp> 270__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&); 271 272} // namespace __indexer_detail 273 274template <size_t _Idx, class ..._Types> 275using __type_pack_element = typename decltype( 276 __indexer_detail::__at_index<_Idx>( 277 __indexer_detail::__indexer< 278 __tuple_types<_Types...>, 279 typename __make_tuple_indices<sizeof...(_Types)>::type 280 >{}) 281 )::type; 282#endif 283 284template <size_t _Ip, class ..._Types> 285class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...>> 286{ 287public: 288 static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range"); 289 typedef __type_pack_element<_Ip, _Types...> type; 290}; 291 292 293template <class ..._Tp> 294class _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> > 295 : public integral_constant<size_t, sizeof...(_Tp)> 296{ 297}; 298 299template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {}; 300 301template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile> 302struct __apply_cv_mf; 303template <> 304struct __apply_cv_mf<false, false, false> { 305 template <class _Tp> using __apply = _Tp; 306}; 307template <> 308struct __apply_cv_mf<false, true, false> { 309 template <class _Tp> using __apply = const _Tp; 310}; 311template <> 312struct __apply_cv_mf<false, false, true> { 313 template <class _Tp> using __apply = volatile _Tp; 314}; 315template <> 316struct __apply_cv_mf<false, true, true> { 317 template <class _Tp> using __apply = const volatile _Tp; 318}; 319template <> 320struct __apply_cv_mf<true, false, false> { 321 template <class _Tp> using __apply = _Tp&; 322}; 323template <> 324struct __apply_cv_mf<true, true, false> { 325 template <class _Tp> using __apply = const _Tp&; 326}; 327template <> 328struct __apply_cv_mf<true, false, true> { 329 template <class _Tp> using __apply = volatile _Tp&; 330}; 331template <> 332struct __apply_cv_mf<true, true, true> { 333 template <class _Tp> using __apply = const volatile _Tp&; 334}; 335template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type> 336using __apply_cv_t = __apply_cv_mf< 337 is_lvalue_reference<_Tp>::value, 338 is_const<_RawTp>::value, 339 is_volatile<_RawTp>::value>; 340 341// __make_tuple_types 342 343// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a 344// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep). 345// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a 346// lvalue_reference type, then __tuple_types<_Types&...> is the result. 347 348template <class _TupleTypes, class _TupleIndices> 349struct __make_tuple_types_flat; 350 351template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx> 352struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> { 353 // Specialization for pair, tuple, and __tuple_types 354 template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>> 355 using __apply_quals = __tuple_types< 356 typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>... 357 >; 358}; 359 360template <class _Vt, size_t _Np, size_t ..._Idx> 361struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> { 362 template <size_t> 363 using __value_type = _Vt; 364 template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>> 365 using __apply_quals = __tuple_types< 366 typename _ApplyFn::template __apply<__value_type<_Idx>>... 367 >; 368}; 369 370template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, 371 size_t _Sp = 0, 372 bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)> 373struct __make_tuple_types 374{ 375 static_assert(_Sp <= _Ep, "__make_tuple_types input error"); 376 using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type; 377 using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>; 378 using type = typename _Maker::template __apply_quals<_Tp>; 379}; 380 381template <class ..._Types, size_t _Ep> 382struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> { 383 typedef __tuple_types<_Types...> type; 384}; 385 386template <class ..._Types, size_t _Ep> 387struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> { 388 typedef __tuple_types<_Types...> type; 389}; 390 391template <bool ..._Preds> 392struct __all_dummy; 393 394template <bool ..._Pred> 395using __all = is_same<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>>; 396 397struct __tuple_sfinae_base { 398 template <template <class, class...> class _Trait, 399 class ..._LArgs, class ..._RArgs> 400 static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>) 401 -> __all<typename enable_if<_Trait<_LArgs, _RArgs>::value, bool>::type{true}...>; 402 template <template <class...> class> 403 static auto __do_test(...) -> false_type; 404 405 template <class _FromArgs, class _ToArgs> 406 using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{})); 407 template <class _FromArgs, class _ToArgs> 408 using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{})); 409 template <class _FromArgs, class _ToArgs> 410 using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{})); 411}; 412 413// __tuple_convertible 414 415template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value, 416 bool = __tuple_like<_Up>::value> 417struct __tuple_convertible 418 : public false_type {}; 419 420template <class _Tp, class _Up> 421struct __tuple_convertible<_Tp, _Up, true, true> 422 : public __tuple_sfinae_base::__convertible< 423 typename __make_tuple_types<_Tp>::type 424 , typename __make_tuple_types<_Up>::type 425 > 426{}; 427 428// __tuple_constructible 429 430template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value, 431 bool = __tuple_like<_Up>::value> 432struct __tuple_constructible 433 : public false_type {}; 434 435template <class _Tp, class _Up> 436struct __tuple_constructible<_Tp, _Up, true, true> 437 : public __tuple_sfinae_base::__constructible< 438 typename __make_tuple_types<_Tp>::type 439 , typename __make_tuple_types<_Up>::type 440 > 441{}; 442 443// __tuple_assignable 444 445template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value, 446 bool = __tuple_like<_Up>::value> 447struct __tuple_assignable 448 : public false_type {}; 449 450template <class _Tp, class _Up> 451struct __tuple_assignable<_Tp, _Up, true, true> 452 : public __tuple_sfinae_base::__assignable< 453 typename __make_tuple_types<_Tp>::type 454 , typename __make_tuple_types<_Up&>::type 455 > 456{}; 457 458 459template <size_t _Ip, class ..._Tp> 460class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> > 461{ 462public: 463 typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type; 464}; 465 466#if _LIBCPP_STD_VER > 11 467template <size_t _Ip, class ..._Tp> 468using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type; 469#endif 470 471#endif // _LIBCPP_HAS_NO_VARIADICS 472 473#ifndef _LIBCPP_CXX03_LANG 474template <bool _IsTuple, class _SizeTrait, size_t _Expected> 475struct __tuple_like_with_size_imp : false_type {}; 476 477template <class _SizeTrait, size_t _Expected> 478struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected> 479 : integral_constant<bool, _SizeTrait::value == _Expected> {}; 480 481template <class _Tuple, size_t _ExpectedSize, 482 class _RawTuple = typename __uncvref<_Tuple>::type> 483using __tuple_like_with_size = __tuple_like_with_size_imp< 484 __tuple_like<_RawTuple>::value, 485 tuple_size<_RawTuple>, _ExpectedSize 486 >; 487 488struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail { 489 template <class ...> 490 static constexpr bool __enable_default() { return false; } 491 template <class ...> 492 static constexpr bool __enable_explicit() { return false; } 493 template <class ...> 494 static constexpr bool __enable_implicit() { return false; } 495 template <class ...> 496 static constexpr bool __enable_assign() { return false; } 497}; 498#endif 499 500#if _LIBCPP_STD_VER > 14 501 502template <bool _CanCopy, bool _CanMove> 503struct __sfinae_ctor_base {}; 504template <> 505struct __sfinae_ctor_base<false, false> { 506 __sfinae_ctor_base() = default; 507 __sfinae_ctor_base(__sfinae_ctor_base const&) = delete; 508 __sfinae_ctor_base(__sfinae_ctor_base &&) = delete; 509 __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 510 __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 511}; 512template <> 513struct __sfinae_ctor_base<true, false> { 514 __sfinae_ctor_base() = default; 515 __sfinae_ctor_base(__sfinae_ctor_base const&) = default; 516 __sfinae_ctor_base(__sfinae_ctor_base &&) = delete; 517 __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 518 __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 519}; 520template <> 521struct __sfinae_ctor_base<false, true> { 522 __sfinae_ctor_base() = default; 523 __sfinae_ctor_base(__sfinae_ctor_base const&) = delete; 524 __sfinae_ctor_base(__sfinae_ctor_base &&) = default; 525 __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 526 __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 527}; 528 529template <bool _CanCopy, bool _CanMove> 530struct __sfinae_assign_base {}; 531template <> 532struct __sfinae_assign_base<false, false> { 533 __sfinae_assign_base() = default; 534 __sfinae_assign_base(__sfinae_assign_base const&) = default; 535 __sfinae_assign_base(__sfinae_assign_base &&) = default; 536 __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete; 537 __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete; 538}; 539template <> 540struct __sfinae_assign_base<true, false> { 541 __sfinae_assign_base() = default; 542 __sfinae_assign_base(__sfinae_assign_base const&) = default; 543 __sfinae_assign_base(__sfinae_assign_base &&) = default; 544 __sfinae_assign_base& operator=(__sfinae_assign_base const&) = default; 545 __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete; 546}; 547template <> 548struct __sfinae_assign_base<false, true> { 549 __sfinae_assign_base() = default; 550 __sfinae_assign_base(__sfinae_assign_base const&) = default; 551 __sfinae_assign_base(__sfinae_assign_base &&) = default; 552 __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete; 553 __sfinae_assign_base& operator=(__sfinae_assign_base&&) = default; 554}; 555#endif // _LIBCPP_STD_VER > 14 556 557_LIBCPP_END_NAMESPACE_STD 558 559#endif // _LIBCPP___TUPLE 560