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 25 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size; 26 27 #if !defined(_LIBCPP_CXX03_LANG) 28 template <class _Tp, class...> 29 using __enable_if_tuple_size_imp = _Tp; 30 31 template <class _Tp> 32 struct _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 38 template <class _Tp> 39 struct _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 45 template <class _Tp> 46 struct _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 52 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {}; 53 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {}; 54 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {}; 55 #endif 56 57 template <size_t _Ip, class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_element; 58 59 template <size_t _Ip, class _Tp> 60 class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp> 61 { 62 public: 63 typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type; 64 }; 65 66 template <size_t _Ip, class _Tp> 67 class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp> 68 { 69 public: 70 typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type; 71 }; 72 73 template <size_t _Ip, class _Tp> 74 class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp> 75 { 76 public: 77 typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type; 78 }; 79 80 template <class _Tp> struct __tuple_like : false_type {}; 81 82 template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {}; 83 template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {}; 84 template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {}; 85 86 // tuple specializations 87 88 #ifndef _LIBCPP_CXX03_LANG 89 90 template <size_t...> struct __tuple_indices {}; 91 92 template <class _IdxType, _IdxType... _Values> 93 struct __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) 102 namespace __detail { 103 104 template<typename _Tp, size_t ..._Extra> struct __repeat; 105 template<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 }; 117 118 template<size_t _Np> struct __parity; 119 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {}; 120 121 template<> struct __make<0> { typedef __integer_sequence<size_t> type; }; 122 template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; }; 123 template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; }; 124 template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; }; 125 template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; }; 126 template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; }; 127 template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; }; 128 template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; }; 129 130 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; }; 131 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; }; 132 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; }; 133 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; }; 134 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 135 template<> 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> {}; }; 136 template<> 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> {}; }; 137 template<> 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) 144 template <size_t _Ep, size_t _Sp> 145 using __make_indices_imp = 146 typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template 147 __to_tuple_indices<_Sp>; 148 #else 149 template <size_t _Ep, size_t _Sp> 150 using __make_indices_imp = 151 typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>; 152 153 #endif 154 155 template <size_t _Ep, size_t _Sp = 0> 156 struct __make_tuple_indices 157 { 158 static_assert(_Sp <= _Ep, "__make_tuple_indices input error"); 159 typedef __make_indices_imp<_Ep, _Sp> type; 160 }; 161 162 163 template <class ..._Tp> class _LIBCPP_TEMPLATE_VIS tuple; 164 165 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {}; 166 167 template <class ..._Tp> 168 struct _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> > 169 : public integral_constant<size_t, sizeof...(_Tp)> 170 { 171 }; 172 173 template <size_t _Ip, class ..._Tp> 174 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 175 typename tuple_element<_Ip, tuple<_Tp...> >::type& 176 get(tuple<_Tp...>&) _NOEXCEPT; 177 178 template <size_t _Ip, class ..._Tp> 179 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 180 const typename tuple_element<_Ip, tuple<_Tp...> >::type& 181 get(const tuple<_Tp...>&) _NOEXCEPT; 182 183 template <size_t _Ip, class ..._Tp> 184 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 185 typename tuple_element<_Ip, tuple<_Tp...> >::type&& 186 get(tuple<_Tp...>&&) _NOEXCEPT; 187 188 template <size_t _Ip, class ..._Tp> 189 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 190 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& 191 get(const tuple<_Tp...>&&) _NOEXCEPT; 192 193 #endif // !defined(_LIBCPP_CXX03_LANG) 194 195 // pair specializations 196 197 template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {}; 198 199 template <size_t _Ip, class _T1, class _T2> 200 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 201 typename tuple_element<_Ip, pair<_T1, _T2> >::type& 202 get(pair<_T1, _T2>&) _NOEXCEPT; 203 204 template <size_t _Ip, class _T1, class _T2> 205 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 206 const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 207 get(const pair<_T1, _T2>&) _NOEXCEPT; 208 209 #ifndef _LIBCPP_CXX03_LANG 210 template <size_t _Ip, class _T1, class _T2> 211 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 212 typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 213 get(pair<_T1, _T2>&&) _NOEXCEPT; 214 215 template <size_t _Ip, class _T1, class _T2> 216 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 217 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 218 get(const pair<_T1, _T2>&&) _NOEXCEPT; 219 #endif 220 221 // array specializations 222 223 template <class _Tp, size_t _Size> struct _LIBCPP_TEMPLATE_VIS array; 224 225 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {}; 226 227 template <size_t _Ip, class _Tp, size_t _Size> 228 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 229 _Tp& 230 get(array<_Tp, _Size>&) _NOEXCEPT; 231 232 template <size_t _Ip, class _Tp, size_t _Size> 233 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 234 const _Tp& 235 get(const array<_Tp, _Size>&) _NOEXCEPT; 236 237 #ifndef _LIBCPP_CXX03_LANG 238 template <size_t _Ip, class _Tp, size_t _Size> 239 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 240 _Tp&& 241 get(array<_Tp, _Size>&&) _NOEXCEPT; 242 243 template <size_t _Ip, class _Tp, size_t _Size> 244 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 245 const _Tp&& 246 get(const array<_Tp, _Size>&&) _NOEXCEPT; 247 #endif 248 249 #ifndef _LIBCPP_CXX03_LANG 250 251 // __tuple_types 252 253 template <class ..._Tp> struct __tuple_types {}; 254 255 #if !__has_builtin(__type_pack_element) 256 257 namespace __indexer_detail { 258 259 template <size_t _Idx, class _Tp> 260 struct __indexed { using type = _Tp; }; 261 262 template <class _Types, class _Indexes> struct __indexer; 263 264 template <class ..._Types, size_t ..._Idx> 265 struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>> 266 : __indexed<_Idx, _Types>... 267 {}; 268 269 template <size_t _Idx, class _Tp> 270 __indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&); 271 272 } // namespace __indexer_detail 273 274 template <size_t _Idx, class ..._Types> 275 using __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 283 284 template <size_t _Ip, class ..._Types> 285 class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...>> 286 { 287 public: 288 static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range"); 289 typedef __type_pack_element<_Ip, _Types...> type; 290 }; 291 292 293 template <class ..._Tp> 294 struct _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> > 295 : public integral_constant<size_t, sizeof...(_Tp)> 296 { 297 }; 298 299 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {}; 300 301 template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile> 302 struct __apply_cv_mf; 303 template <> 304 struct __apply_cv_mf<false, false, false> { 305 template <class _Tp> using __apply = _Tp; 306 }; 307 template <> 308 struct __apply_cv_mf<false, true, false> { 309 template <class _Tp> using __apply = const _Tp; 310 }; 311 template <> 312 struct __apply_cv_mf<false, false, true> { 313 template <class _Tp> using __apply = volatile _Tp; 314 }; 315 template <> 316 struct __apply_cv_mf<false, true, true> { 317 template <class _Tp> using __apply = const volatile _Tp; 318 }; 319 template <> 320 struct __apply_cv_mf<true, false, false> { 321 template <class _Tp> using __apply = _Tp&; 322 }; 323 template <> 324 struct __apply_cv_mf<true, true, false> { 325 template <class _Tp> using __apply = const _Tp&; 326 }; 327 template <> 328 struct __apply_cv_mf<true, false, true> { 329 template <class _Tp> using __apply = volatile _Tp&; 330 }; 331 template <> 332 struct __apply_cv_mf<true, true, true> { 333 template <class _Tp> using __apply = const volatile _Tp&; 334 }; 335 template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type> 336 using __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. 347 348 template <class _TupleTypes, class _TupleIndices> 349 struct __make_tuple_types_flat; 350 351 template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx> 352 struct __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 }; 359 360 template <class _Vt, size_t _Np, size_t ..._Idx> 361 struct __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 }; 369 370 template <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)> 373 struct __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 }; 380 381 template <class ..._Types, size_t _Ep> 382 struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> { 383 typedef __tuple_types<_Types...> type; 384 }; 385 386 template <class ..._Types, size_t _Ep> 387 struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> { 388 typedef __tuple_types<_Types...> type; 389 }; 390 391 template <bool ..._Preds> 392 struct __all_dummy; 393 394 template <bool ..._Pred> 395 using __all = is_same<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>>; 396 397 struct __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 414 415 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value, 416 bool = __tuple_like<_Up>::value> 417 struct __tuple_convertible 418 : public false_type {}; 419 420 template <class _Tp, class _Up> 421 struct __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 429 430 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value, 431 bool = __tuple_like<_Up>::value> 432 struct __tuple_constructible 433 : public false_type {}; 434 435 template <class _Tp, class _Up> 436 struct __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 444 445 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value, 446 bool = __tuple_like<_Up>::value> 447 struct __tuple_assignable 448 : public false_type {}; 449 450 template <class _Tp, class _Up> 451 struct __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 {}; 457 458 459 template <size_t _Ip, class ..._Tp> 460 class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> > 461 { 462 public: 463 typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type; 464 }; 465 466 #if _LIBCPP_STD_VER > 11 467 template <size_t _Ip, class ..._Tp> 468 using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type; 469 #endif 470 471 template <bool _IsTuple, class _SizeTrait, size_t _Expected> 472 struct __tuple_like_with_size_imp : false_type {}; 473 474 template <class _SizeTrait, size_t _Expected> 475 struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected> 476 : integral_constant<bool, _SizeTrait::value == _Expected> {}; 477 478 template <class _Tuple, size_t _ExpectedSize, 479 class _RawTuple = typename __uncvref<_Tuple>::type> 480 using __tuple_like_with_size = __tuple_like_with_size_imp< 481 __tuple_like<_RawTuple>::value, 482 tuple_size<_RawTuple>, _ExpectedSize 483 >; 484 485 struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail { 486 template <class ...> 487 static constexpr bool __enable_default() { return false; } 488 template <class ...> 489 static constexpr bool __enable_explicit() { return false; } 490 template <class ...> 491 static constexpr bool __enable_implicit() { return false; } 492 template <class ...> 493 static constexpr bool __enable_assign() { return false; } 494 }; 495 #endif // !defined(_LIBCPP_CXX03_LANG) 496 497 #if _LIBCPP_STD_VER > 14 498 499 template <bool _CanCopy, bool _CanMove> 500 struct __sfinae_ctor_base {}; 501 template <> 502 struct __sfinae_ctor_base<false, false> { 503 __sfinae_ctor_base() = default; 504 __sfinae_ctor_base(__sfinae_ctor_base const&) = delete; 505 __sfinae_ctor_base(__sfinae_ctor_base &&) = delete; 506 __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 507 __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 508 }; 509 template <> 510 struct __sfinae_ctor_base<true, false> { 511 __sfinae_ctor_base() = default; 512 __sfinae_ctor_base(__sfinae_ctor_base const&) = default; 513 __sfinae_ctor_base(__sfinae_ctor_base &&) = delete; 514 __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 515 __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 516 }; 517 template <> 518 struct __sfinae_ctor_base<false, true> { 519 __sfinae_ctor_base() = default; 520 __sfinae_ctor_base(__sfinae_ctor_base const&) = delete; 521 __sfinae_ctor_base(__sfinae_ctor_base &&) = default; 522 __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 523 __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 524 }; 525 526 template <bool _CanCopy, bool _CanMove> 527 struct __sfinae_assign_base {}; 528 template <> 529 struct __sfinae_assign_base<false, false> { 530 __sfinae_assign_base() = default; 531 __sfinae_assign_base(__sfinae_assign_base const&) = default; 532 __sfinae_assign_base(__sfinae_assign_base &&) = default; 533 __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete; 534 __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete; 535 }; 536 template <> 537 struct __sfinae_assign_base<true, false> { 538 __sfinae_assign_base() = default; 539 __sfinae_assign_base(__sfinae_assign_base const&) = default; 540 __sfinae_assign_base(__sfinae_assign_base &&) = default; 541 __sfinae_assign_base& operator=(__sfinae_assign_base const&) = default; 542 __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete; 543 }; 544 template <> 545 struct __sfinae_assign_base<false, true> { 546 __sfinae_assign_base() = default; 547 __sfinae_assign_base(__sfinae_assign_base const&) = default; 548 __sfinae_assign_base(__sfinae_assign_base &&) = default; 549 __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete; 550 __sfinae_assign_base& operator=(__sfinae_assign_base&&) = default; 551 }; 552 #endif // _LIBCPP_STD_VER > 14 553 554 _LIBCPP_END_NAMESPACE_STD 555 556 #endif // _LIBCPP___TUPLE 557
