| 1 | // <tuple> -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2007-2024 Free Software Foundation, Inc. |
| 4 | // |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
| 6 | // software; you can redistribute it and/or modify it under the |
| 7 | // terms of the GNU General Public License as published by the |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 9 | // any later version. |
| 10 | |
| 11 | // This library is distributed in the hope that it will be useful, |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | // GNU General Public License for more details. |
| 15 | |
| 16 | // Under Section 7 of GPL version 3, you are granted additional |
| 17 | // permissions described in the GCC Runtime Library Exception, version |
| 18 | // 3.1, as published by the Free Software Foundation. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License and |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 | // <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | /** @file include/tuple |
| 26 | * This is a Standard C++ Library header. |
| 27 | */ |
| 28 | |
| 29 | #ifndef _GLIBCXX_TUPLE |
| 30 | #define _GLIBCXX_TUPLE 1 |
| 31 | |
| 32 | #pragma GCC system_header |
| 33 | |
| 34 | #if __cplusplus < 201103L |
| 35 | # include <bits/c++0x_warning.h> |
| 36 | #else |
| 37 | |
| 38 | #include <bits/stl_pair.h> // for std::pair |
| 39 | #include <bits/uses_allocator.h> // for std::allocator_arg_t |
| 40 | #include <bits/utility.h> // for std::tuple_size etc. |
| 41 | #include <bits/invoke.h> // for std::__invoke |
| 42 | #if __cplusplus > 201703L |
| 43 | # include <compare> |
| 44 | # include <bits/ranges_util.h> // for std::ranges::subrange |
| 45 | #endif |
| 46 | |
| 47 | #define __glibcxx_want_constexpr_tuple |
| 48 | #define __glibcxx_want_tuple_element_t |
| 49 | #define __glibcxx_want_tuples_by_type |
| 50 | #define __glibcxx_want_apply |
| 51 | #define __glibcxx_want_make_from_tuple |
| 52 | #define __glibcxx_want_ranges_zip |
| 53 | #define __glibcxx_want_tuple_like |
| 54 | #include <bits/version.h> |
| 55 | |
| 56 | namespace std _GLIBCXX_VISIBILITY(default) |
| 57 | { |
| 58 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 59 | |
| 60 | /** |
| 61 | * @addtogroup utilities |
| 62 | * @{ |
| 63 | */ |
| 64 | |
| 65 | template<typename... _Elements> |
| 66 | class tuple; |
| 67 | |
| 68 | /// @cond undocumented |
| 69 | template<typename _Tp> |
| 70 | struct __is_empty_non_tuple : is_empty<_Tp> { }; |
| 71 | |
| 72 | // Using EBO for elements that are tuples causes ambiguous base errors. |
| 73 | template<typename _El0, typename... _El> |
| 74 | struct __is_empty_non_tuple<tuple<_El0, _El...>> : false_type { }; |
| 75 | |
| 76 | // Use the Empty Base-class Optimization for empty, non-final types. |
| 77 | template<typename _Tp> |
| 78 | using __empty_not_final |
| 79 | = __conditional_t<__is_final(_Tp), false_type, |
| 80 | __is_empty_non_tuple<_Tp>>; |
| 81 | |
| 82 | template<size_t _Idx, typename _Head, |
| 83 | bool = __empty_not_final<_Head>::value> |
| 84 | struct _Head_base; |
| 85 | |
| 86 | #if __has_cpp_attribute(__no_unique_address__) |
| 87 | template<size_t _Idx, typename _Head> |
| 88 | struct _Head_base<_Idx, _Head, true> |
| 89 | { |
| 90 | constexpr _Head_base() |
| 91 | : _M_head_impl() { } |
| 92 | |
| 93 | constexpr _Head_base(const _Head& __h) |
| 94 | : _M_head_impl(__h) { } |
| 95 | |
| 96 | constexpr _Head_base(const _Head_base&) = default; |
| 97 | constexpr _Head_base(_Head_base&&) = default; |
| 98 | |
| 99 | template<typename _UHead> |
| 100 | constexpr _Head_base(_UHead&& __h) |
| 101 | : _M_head_impl(std::forward<_UHead>(__h)) { } |
| 102 | |
| 103 | _GLIBCXX20_CONSTEXPR |
| 104 | _Head_base(allocator_arg_t, __uses_alloc0) |
| 105 | : _M_head_impl() { } |
| 106 | |
| 107 | template<typename _Alloc> |
| 108 | _GLIBCXX20_CONSTEXPR |
| 109 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
| 110 | : _M_head_impl(allocator_arg, *__a._M_a) { } |
| 111 | |
| 112 | template<typename _Alloc> |
| 113 | _GLIBCXX20_CONSTEXPR |
| 114 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
| 115 | : _M_head_impl(*__a._M_a) { } |
| 116 | |
| 117 | template<typename _UHead> |
| 118 | _GLIBCXX20_CONSTEXPR |
| 119 | _Head_base(__uses_alloc0, _UHead&& __uhead) |
| 120 | : _M_head_impl(std::forward<_UHead>(__uhead)) { } |
| 121 | |
| 122 | template<typename _Alloc, typename _UHead> |
| 123 | _GLIBCXX20_CONSTEXPR |
| 124 | _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
| 125 | : _M_head_impl(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) |
| 126 | { } |
| 127 | |
| 128 | template<typename _Alloc, typename _UHead> |
| 129 | _GLIBCXX20_CONSTEXPR |
| 130 | _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
| 131 | : _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { } |
| 132 | |
| 133 | static constexpr _Head& |
| 134 | _M_head(_Head_base& __b) noexcept { return __b._M_head_impl; } |
| 135 | |
| 136 | static constexpr const _Head& |
| 137 | _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; } |
| 138 | |
| 139 | [[__no_unique_address__]] _Head _M_head_impl; |
| 140 | }; |
| 141 | #else |
| 142 | template<size_t _Idx, typename _Head> |
| 143 | struct _Head_base<_Idx, _Head, true> |
| 144 | : public _Head |
| 145 | { |
| 146 | constexpr _Head_base() |
| 147 | : _Head() { } |
| 148 | |
| 149 | constexpr _Head_base(const _Head& __h) |
| 150 | : _Head(__h) { } |
| 151 | |
| 152 | constexpr _Head_base(const _Head_base&) = default; |
| 153 | constexpr _Head_base(_Head_base&&) = default; |
| 154 | |
| 155 | template<typename _UHead> |
| 156 | constexpr _Head_base(_UHead&& __h) |
| 157 | : _Head(std::forward<_UHead>(__h)) { } |
| 158 | |
| 159 | _GLIBCXX20_CONSTEXPR |
| 160 | _Head_base(allocator_arg_t, __uses_alloc0) |
| 161 | : _Head() { } |
| 162 | |
| 163 | template<typename _Alloc> |
| 164 | _GLIBCXX20_CONSTEXPR |
| 165 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
| 166 | : _Head(allocator_arg, *__a._M_a) { } |
| 167 | |
| 168 | template<typename _Alloc> |
| 169 | _GLIBCXX20_CONSTEXPR |
| 170 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
| 171 | : _Head(*__a._M_a) { } |
| 172 | |
| 173 | template<typename _UHead> |
| 174 | _GLIBCXX20_CONSTEXPR |
| 175 | _Head_base(__uses_alloc0, _UHead&& __uhead) |
| 176 | : _Head(std::forward<_UHead>(__uhead)) { } |
| 177 | |
| 178 | template<typename _Alloc, typename _UHead> |
| 179 | _GLIBCXX20_CONSTEXPR |
| 180 | _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
| 181 | : _Head(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) { } |
| 182 | |
| 183 | template<typename _Alloc, typename _UHead> |
| 184 | _GLIBCXX20_CONSTEXPR |
| 185 | _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
| 186 | : _Head(std::forward<_UHead>(__uhead), *__a._M_a) { } |
| 187 | |
| 188 | static constexpr _Head& |
| 189 | _M_head(_Head_base& __b) noexcept { return __b; } |
| 190 | |
| 191 | static constexpr const _Head& |
| 192 | _M_head(const _Head_base& __b) noexcept { return __b; } |
| 193 | }; |
| 194 | #endif |
| 195 | |
| 196 | template<size_t _Idx, typename _Head> |
| 197 | struct _Head_base<_Idx, _Head, false> |
| 198 | { |
| 199 | constexpr _Head_base() |
| 200 | : _M_head_impl() { } |
| 201 | |
| 202 | constexpr _Head_base(const _Head& __h) |
| 203 | : _M_head_impl(__h) { } |
| 204 | |
| 205 | constexpr _Head_base(const _Head_base&) = default; |
| 206 | constexpr _Head_base(_Head_base&&) = default; |
| 207 | |
| 208 | template<typename _UHead> |
| 209 | constexpr _Head_base(_UHead&& __h) |
| 210 | : _M_head_impl(std::forward<_UHead>(__h)) { } |
| 211 | |
| 212 | _GLIBCXX20_CONSTEXPR |
| 213 | _Head_base(allocator_arg_t, __uses_alloc0) |
| 214 | : _M_head_impl() { } |
| 215 | |
| 216 | template<typename _Alloc> |
| 217 | _GLIBCXX20_CONSTEXPR |
| 218 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
| 219 | : _M_head_impl(allocator_arg, *__a._M_a) { } |
| 220 | |
| 221 | template<typename _Alloc> |
| 222 | _GLIBCXX20_CONSTEXPR |
| 223 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
| 224 | : _M_head_impl(*__a._M_a) { } |
| 225 | |
| 226 | template<typename _UHead> |
| 227 | _GLIBCXX20_CONSTEXPR |
| 228 | _Head_base(__uses_alloc0, _UHead&& __uhead) |
| 229 | : _M_head_impl(std::forward<_UHead>(__uhead)) { } |
| 230 | |
| 231 | template<typename _Alloc, typename _UHead> |
| 232 | _GLIBCXX20_CONSTEXPR |
| 233 | _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
| 234 | : _M_head_impl(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) |
| 235 | { } |
| 236 | |
| 237 | template<typename _Alloc, typename _UHead> |
| 238 | _GLIBCXX20_CONSTEXPR |
| 239 | _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
| 240 | : _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { } |
| 241 | |
| 242 | static constexpr _Head& |
| 243 | _M_head(_Head_base& __b) noexcept { return __b._M_head_impl; } |
| 244 | |
| 245 | static constexpr const _Head& |
| 246 | _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; } |
| 247 | |
| 248 | _Head _M_head_impl; |
| 249 | }; |
| 250 | |
| 251 | #if __cpp_lib_tuple_like // >= C++23 |
| 252 | struct __tuple_like_tag_t { explicit __tuple_like_tag_t() = default; }; |
| 253 | |
| 254 | // These forward declarations are used by the operator<=> overload for |
| 255 | // tuple-like types. |
| 256 | template<typename _Cat, typename _Tp, typename _Up> |
| 257 | constexpr _Cat |
| 258 | __tuple_cmp(const _Tp&, const _Up&, index_sequence<>); |
| 259 | |
| 260 | template<typename _Cat, typename _Tp, typename _Up, |
| 261 | size_t _Idx0, size_t... _Idxs> |
| 262 | constexpr _Cat |
| 263 | __tuple_cmp(const _Tp& __t, const _Up& __u, |
| 264 | index_sequence<_Idx0, _Idxs...>); |
| 265 | #endif // C++23 |
| 266 | |
| 267 | /** |
| 268 | * Contains the actual implementation of the @c tuple template, stored |
| 269 | * as a recursive inheritance hierarchy from the first element (most |
| 270 | * derived class) to the last (least derived class). The @c Idx |
| 271 | * parameter gives the 0-based index of the element stored at this |
| 272 | * point in the hierarchy; we use it to implement a constant-time |
| 273 | * get() operation. |
| 274 | */ |
| 275 | template<size_t _Idx, typename... _Elements> |
| 276 | struct _Tuple_impl; |
| 277 | |
| 278 | /** |
| 279 | * Recursive tuple implementation. Here we store the @c Head element |
| 280 | * and derive from a @c Tuple_impl containing the remaining elements |
| 281 | * (which contains the @c Tail). |
| 282 | */ |
| 283 | template<size_t _Idx, typename _Head, typename... _Tail> |
| 284 | struct _Tuple_impl<_Idx, _Head, _Tail...> |
| 285 | : public _Tuple_impl<_Idx + 1, _Tail...>, |
| 286 | private _Head_base<_Idx, _Head> |
| 287 | { |
| 288 | template<size_t, typename...> friend struct _Tuple_impl; |
| 289 | |
| 290 | typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited; |
| 291 | typedef _Head_base<_Idx, _Head> _Base; |
| 292 | |
| 293 | static constexpr _Head& |
| 294 | _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| 295 | |
| 296 | static constexpr const _Head& |
| 297 | _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| 298 | |
| 299 | static constexpr _Inherited& |
| 300 | _M_tail(_Tuple_impl& __t) noexcept { return __t; } |
| 301 | |
| 302 | static constexpr const _Inherited& |
| 303 | _M_tail(const _Tuple_impl& __t) noexcept { return __t; } |
| 304 | |
| 305 | constexpr _Tuple_impl() |
| 306 | : _Inherited(), _Base() { } |
| 307 | |
| 308 | explicit constexpr |
| 309 | _Tuple_impl(const _Head& __head, const _Tail&... __tail) |
| 310 | : _Inherited(__tail...), _Base(__head) |
| 311 | { } |
| 312 | |
| 313 | template<typename _UHead, typename... _UTail, |
| 314 | typename = __enable_if_t<sizeof...(_Tail) == sizeof...(_UTail)>> |
| 315 | explicit constexpr |
| 316 | _Tuple_impl(_UHead&& __head, _UTail&&... __tail) |
| 317 | : _Inherited(std::forward<_UTail>(__tail)...), |
| 318 | _Base(std::forward<_UHead>(__head)) |
| 319 | { } |
| 320 | |
| 321 | constexpr _Tuple_impl(const _Tuple_impl&) = default; |
| 322 | |
| 323 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 324 | // 2729. Missing SFINAE on std::pair::operator= |
| 325 | _Tuple_impl& operator=(const _Tuple_impl&) = delete; |
| 326 | |
| 327 | _Tuple_impl(_Tuple_impl&&) = default; |
| 328 | |
| 329 | template<typename... _UElements> |
| 330 | constexpr |
| 331 | _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in) |
| 332 | : _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
| 333 | _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) |
| 334 | { } |
| 335 | |
| 336 | template<typename _UHead, typename... _UTails> |
| 337 | constexpr |
| 338 | _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| 339 | : _Inherited(std::move |
| 340 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
| 341 | _Base(std::forward<_UHead> |
| 342 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) |
| 343 | { } |
| 344 | |
| 345 | #if __cpp_lib_ranges_zip // >= C++23 |
| 346 | template<typename... _UElements> |
| 347 | constexpr |
| 348 | _Tuple_impl(_Tuple_impl<_Idx, _UElements...>& __in) |
| 349 | : _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
| 350 | _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) |
| 351 | { } |
| 352 | |
| 353 | template<typename _UHead, typename... _UTails> |
| 354 | constexpr |
| 355 | _Tuple_impl(const _Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| 356 | : _Inherited(std::move |
| 357 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
| 358 | _Base(std::forward<const _UHead> |
| 359 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) |
| 360 | { } |
| 361 | #endif // C++23 |
| 362 | |
| 363 | #if __cpp_lib_tuple_like // >= C++23 |
| 364 | template<typename _UTuple, size_t... _Is> |
| 365 | constexpr |
| 366 | _Tuple_impl(__tuple_like_tag_t, _UTuple&& __u, index_sequence<_Is...>) |
| 367 | : _Tuple_impl(std::get<_Is>(std::forward<_UTuple>(__u))...) |
| 368 | { } |
| 369 | #endif // C++23 |
| 370 | |
| 371 | template<typename _Alloc> |
| 372 | _GLIBCXX20_CONSTEXPR |
| 373 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) |
| 374 | : _Inherited(__tag, __a), |
| 375 | _Base(__tag, __use_alloc<_Head>(__a)) |
| 376 | { } |
| 377 | |
| 378 | template<typename _Alloc> |
| 379 | _GLIBCXX20_CONSTEXPR |
| 380 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 381 | const _Head& __head, const _Tail&... __tail) |
| 382 | : _Inherited(__tag, __a, __tail...), |
| 383 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) |
| 384 | { } |
| 385 | |
| 386 | template<typename _Alloc, typename _UHead, typename... _UTail, |
| 387 | typename = __enable_if_t<sizeof...(_Tail) == sizeof...(_UTail)>> |
| 388 | _GLIBCXX20_CONSTEXPR |
| 389 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 390 | _UHead&& __head, _UTail&&... __tail) |
| 391 | : _Inherited(__tag, __a, std::forward<_UTail>(__tail)...), |
| 392 | _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| 393 | std::forward<_UHead>(__head)) |
| 394 | { } |
| 395 | |
| 396 | template<typename _Alloc> |
| 397 | _GLIBCXX20_CONSTEXPR |
| 398 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 399 | const _Tuple_impl& __in) |
| 400 | : _Inherited(__tag, __a, _M_tail(__in)), |
| 401 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) |
| 402 | { } |
| 403 | |
| 404 | template<typename _Alloc> |
| 405 | _GLIBCXX20_CONSTEXPR |
| 406 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 407 | _Tuple_impl&& __in) |
| 408 | : _Inherited(__tag, __a, std::move(_M_tail(__in))), |
| 409 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
| 410 | std::forward<_Head>(_M_head(__in))) |
| 411 | { } |
| 412 | |
| 413 | template<typename _Alloc, typename _UHead, typename... _UTails> |
| 414 | _GLIBCXX20_CONSTEXPR |
| 415 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 416 | const _Tuple_impl<_Idx, _UHead, _UTails...>& __in) |
| 417 | : _Inherited(__tag, __a, |
| 418 | _Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)), |
| 419 | _Base(__use_alloc<_Head, _Alloc, const _UHead&>(__a), |
| 420 | _Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)) |
| 421 | { } |
| 422 | |
| 423 | template<typename _Alloc, typename _UHead, typename... _UTails> |
| 424 | _GLIBCXX20_CONSTEXPR |
| 425 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 426 | _Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| 427 | : _Inherited(__tag, __a, std::move |
| 428 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
| 429 | _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| 430 | std::forward<_UHead> |
| 431 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) |
| 432 | { } |
| 433 | |
| 434 | #if __cpp_lib_ranges_zip // >= C++23 |
| 435 | template<typename _Alloc, typename _UHead, typename... _UTails> |
| 436 | constexpr |
| 437 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 438 | _Tuple_impl<_Idx, _UHead, _UTails...>& __in) |
| 439 | : _Inherited(__tag, __a, |
| 440 | _Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)), |
| 441 | _Base(__use_alloc<_Head, _Alloc, _UHead&>(__a), |
| 442 | _Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)) |
| 443 | { } |
| 444 | |
| 445 | template<typename _Alloc, typename _UHead, typename... _UTails> |
| 446 | constexpr |
| 447 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| 448 | const _Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| 449 | : _Inherited(__tag, __a, std::move |
| 450 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
| 451 | _Base(__use_alloc<_Head, _Alloc, const _UHead>(__a), |
| 452 | std::forward<const _UHead> |
| 453 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) |
| 454 | { } |
| 455 | #endif // C++23 |
| 456 | |
| 457 | #if __cpp_lib_tuple_like // >= C++23 |
| 458 | template<typename _Alloc, typename _UTuple, size_t... _Is> |
| 459 | constexpr |
| 460 | _Tuple_impl(__tuple_like_tag_t, allocator_arg_t __tag, const _Alloc& __a, |
| 461 | _UTuple&& __u, index_sequence<_Is...>) |
| 462 | : _Tuple_impl(__tag, __a, std::get<_Is>(std::forward<_UTuple>(__u))...) |
| 463 | { } |
| 464 | #endif // C++23 |
| 465 | |
| 466 | template<typename... _UElements> |
| 467 | _GLIBCXX20_CONSTEXPR |
| 468 | void |
| 469 | _M_assign(const _Tuple_impl<_Idx, _UElements...>& __in) |
| 470 | { |
| 471 | _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in); |
| 472 | _M_tail(*this)._M_assign( |
| 473 | _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)); |
| 474 | } |
| 475 | |
| 476 | template<typename _UHead, typename... _UTails> |
| 477 | _GLIBCXX20_CONSTEXPR |
| 478 | void |
| 479 | _M_assign(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| 480 | { |
| 481 | _M_head(*this) = std::forward<_UHead> |
| 482 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)); |
| 483 | _M_tail(*this)._M_assign( |
| 484 | std::move(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))); |
| 485 | } |
| 486 | |
| 487 | #if __cpp_lib_ranges_zip // >= C++23 |
| 488 | template<typename... _UElements> |
| 489 | constexpr void |
| 490 | _M_assign(const _Tuple_impl<_Idx, _UElements...>& __in) const |
| 491 | { |
| 492 | _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in); |
| 493 | _M_tail(*this)._M_assign( |
| 494 | _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)); |
| 495 | } |
| 496 | |
| 497 | template<typename _UHead, typename... _UTails> |
| 498 | constexpr void |
| 499 | _M_assign(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) const |
| 500 | { |
| 501 | _M_head(*this) = std::forward<_UHead> |
| 502 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)); |
| 503 | _M_tail(*this)._M_assign( |
| 504 | std::move(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))); |
| 505 | } |
| 506 | #endif // C++23 |
| 507 | |
| 508 | #if __cpp_lib_tuple_like // >= C++23 |
| 509 | template<typename _UTuple> |
| 510 | constexpr void |
| 511 | _M_assign(__tuple_like_tag_t __tag, _UTuple&& __u) |
| 512 | { |
| 513 | _M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u)); |
| 514 | _M_tail(*this)._M_assign(__tag, std::forward<_UTuple>(__u)); |
| 515 | } |
| 516 | |
| 517 | template<typename _UTuple> |
| 518 | constexpr void |
| 519 | _M_assign(__tuple_like_tag_t __tag, _UTuple&& __u) const |
| 520 | { |
| 521 | _M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u)); |
| 522 | _M_tail(*this)._M_assign(__tag, std::forward<_UTuple>(__u)); |
| 523 | } |
| 524 | #endif // C++23 |
| 525 | |
| 526 | protected: |
| 527 | _GLIBCXX20_CONSTEXPR |
| 528 | void |
| 529 | _M_swap(_Tuple_impl& __in) |
| 530 | { |
| 531 | using std::swap; |
| 532 | swap(_M_head(*this), _M_head(__in)); |
| 533 | _Inherited::_M_swap(_M_tail(__in)); |
| 534 | } |
| 535 | |
| 536 | #if __cpp_lib_ranges_zip // >= C++23 |
| 537 | constexpr void |
| 538 | _M_swap(const _Tuple_impl& __in) const |
| 539 | { |
| 540 | using std::swap; |
| 541 | swap(_M_head(*this), _M_head(__in)); |
| 542 | _Inherited::_M_swap(_M_tail(__in)); |
| 543 | } |
| 544 | #endif // C++23 |
| 545 | }; |
| 546 | |
| 547 | // Basis case of inheritance recursion. |
| 548 | template<size_t _Idx, typename _Head> |
| 549 | struct _Tuple_impl<_Idx, _Head> |
| 550 | : private _Head_base<_Idx, _Head> |
| 551 | { |
| 552 | template<size_t, typename...> friend struct _Tuple_impl; |
| 553 | |
| 554 | typedef _Head_base<_Idx, _Head> _Base; |
| 555 | |
| 556 | static constexpr _Head& |
| 557 | _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| 558 | |
| 559 | static constexpr const _Head& |
| 560 | _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| 561 | |
| 562 | constexpr |
| 563 | _Tuple_impl() |
| 564 | : _Base() { } |
| 565 | |
| 566 | explicit constexpr |
| 567 | _Tuple_impl(const _Head& __head) |
| 568 | : _Base(__head) |
| 569 | { } |
| 570 | |
| 571 | template<typename _UHead> |
| 572 | explicit constexpr |
| 573 | _Tuple_impl(_UHead&& __head) |
| 574 | : _Base(std::forward<_UHead>(__head)) |
| 575 | { } |
| 576 | |
| 577 | constexpr _Tuple_impl(const _Tuple_impl&) = default; |
| 578 | |
| 579 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 580 | // 2729. Missing SFINAE on std::pair::operator= |
| 581 | _Tuple_impl& operator=(const _Tuple_impl&) = delete; |
| 582 | |
| 583 | #if _GLIBCXX_INLINE_VERSION |
| 584 | _Tuple_impl(_Tuple_impl&&) = default; |
| 585 | #else |
| 586 | constexpr |
| 587 | _Tuple_impl(_Tuple_impl&& __in) |
| 588 | noexcept(is_nothrow_move_constructible<_Head>::value) |
| 589 | : _Base(static_cast<_Base&&>(__in)) |
| 590 | { } |
| 591 | #endif |
| 592 | |
| 593 | template<typename _UHead> |
| 594 | constexpr |
| 595 | _Tuple_impl(const _Tuple_impl<_Idx, _UHead>& __in) |
| 596 | : _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in)) |
| 597 | { } |
| 598 | |
| 599 | template<typename _UHead> |
| 600 | constexpr |
| 601 | _Tuple_impl(_Tuple_impl<_Idx, _UHead>&& __in) |
| 602 | : _Base(std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
| 603 | { } |
| 604 | |
| 605 | #if __cpp_lib_ranges_zip // >= C++23 |
| 606 | template<typename _UHead> |
| 607 | constexpr |
| 608 | _Tuple_impl(_Tuple_impl<_Idx, _UHead>& __in) |
| 609 | : _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in)) |
| 610 | { } |
| 611 | |
| 612 | template<typename _UHead> |
| 613 | constexpr |
| 614 | _Tuple_impl(const _Tuple_impl<_Idx, _UHead>&& __in) |
| 615 | : _Base(std::forward<const _UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
| 616 | { } |
| 617 | #endif // C++23 |
| 618 | |
| 619 | #if __cpp_lib_tuple_like // >= C++23 |
| 620 | template<typename _UTuple> |
| 621 | constexpr |
| 622 | _Tuple_impl(__tuple_like_tag_t, _UTuple&& __u, index_sequence<0>) |
| 623 | : _Tuple_impl(std::get<0>(std::forward<_UTuple>(__u))) |
| 624 | { } |
| 625 | #endif // C++23 |
| 626 | |
| 627 | template<typename _Alloc> |
| 628 | _GLIBCXX20_CONSTEXPR |
| 629 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) |
| 630 | : _Base(__tag, __use_alloc<_Head>(__a)) |
| 631 | { } |
| 632 | |
| 633 | template<typename _Alloc> |
| 634 | _GLIBCXX20_CONSTEXPR |
| 635 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 636 | const _Head& __head) |
| 637 | : _Base(__use_alloc<_Head, _Alloc, const _Head&>(__a), __head) |
| 638 | { } |
| 639 | |
| 640 | template<typename _Alloc, typename _UHead> |
| 641 | _GLIBCXX20_CONSTEXPR |
| 642 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 643 | _UHead&& __head) |
| 644 | : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| 645 | std::forward<_UHead>(__head)) |
| 646 | { } |
| 647 | |
| 648 | template<typename _Alloc> |
| 649 | _GLIBCXX20_CONSTEXPR |
| 650 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 651 | const _Tuple_impl& __in) |
| 652 | : _Base(__use_alloc<_Head, _Alloc, const _Head&>(__a), _M_head(__in)) |
| 653 | { } |
| 654 | |
| 655 | template<typename _Alloc> |
| 656 | _GLIBCXX20_CONSTEXPR |
| 657 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 658 | _Tuple_impl&& __in) |
| 659 | : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
| 660 | std::forward<_Head>(_M_head(__in))) |
| 661 | { } |
| 662 | |
| 663 | template<typename _Alloc, typename _UHead> |
| 664 | _GLIBCXX20_CONSTEXPR |
| 665 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 666 | const _Tuple_impl<_Idx, _UHead>& __in) |
| 667 | : _Base(__use_alloc<_Head, _Alloc, const _UHead&>(__a), |
| 668 | _Tuple_impl<_Idx, _UHead>::_M_head(__in)) |
| 669 | { } |
| 670 | |
| 671 | template<typename _Alloc, typename _UHead> |
| 672 | _GLIBCXX20_CONSTEXPR |
| 673 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 674 | _Tuple_impl<_Idx, _UHead>&& __in) |
| 675 | : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| 676 | std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
| 677 | { } |
| 678 | |
| 679 | #if __cpp_lib_ranges_zip // >= C++23 |
| 680 | template<typename _Alloc, typename _UHead> |
| 681 | constexpr |
| 682 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 683 | _Tuple_impl<_Idx, _UHead>& __in) |
| 684 | : _Base(__use_alloc<_Head, _Alloc, _UHead&>(__a), |
| 685 | _Tuple_impl<_Idx, _UHead>::_M_head(__in)) |
| 686 | { } |
| 687 | |
| 688 | template<typename _Alloc, typename _UHead> |
| 689 | constexpr |
| 690 | _Tuple_impl(allocator_arg_t, const _Alloc& __a, |
| 691 | const _Tuple_impl<_Idx, _UHead>&& __in) |
| 692 | : _Base(__use_alloc<_Head, _Alloc, const _UHead>(__a), |
| 693 | std::forward<const _UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
| 694 | { } |
| 695 | #endif // C++23 |
| 696 | |
| 697 | #if __cpp_lib_tuple_like // >= C++23 |
| 698 | template<typename _Alloc, typename _UTuple> |
| 699 | constexpr |
| 700 | _Tuple_impl(__tuple_like_tag_t, allocator_arg_t __tag, const _Alloc& __a, |
| 701 | _UTuple&& __u, index_sequence<0>) |
| 702 | : _Tuple_impl(__tag, __a, std::get<0>(std::forward<_UTuple>(__u))) |
| 703 | { } |
| 704 | #endif // C++23 |
| 705 | |
| 706 | template<typename _UHead> |
| 707 | _GLIBCXX20_CONSTEXPR |
| 708 | void |
| 709 | _M_assign(const _Tuple_impl<_Idx, _UHead>& __in) |
| 710 | { |
| 711 | _M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in); |
| 712 | } |
| 713 | |
| 714 | template<typename _UHead> |
| 715 | _GLIBCXX20_CONSTEXPR |
| 716 | void |
| 717 | _M_assign(_Tuple_impl<_Idx, _UHead>&& __in) |
| 718 | { |
| 719 | _M_head(*this) |
| 720 | = std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)); |
| 721 | } |
| 722 | |
| 723 | #if __cpp_lib_ranges_zip // >= C++23 |
| 724 | template<typename _UHead> |
| 725 | constexpr void |
| 726 | _M_assign(const _Tuple_impl<_Idx, _UHead>& __in) const |
| 727 | { |
| 728 | _M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in); |
| 729 | } |
| 730 | |
| 731 | template<typename _UHead> |
| 732 | constexpr void |
| 733 | _M_assign(_Tuple_impl<_Idx, _UHead>&& __in) const |
| 734 | { |
| 735 | _M_head(*this) |
| 736 | = std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)); |
| 737 | } |
| 738 | #endif // C++23 |
| 739 | |
| 740 | #if __cpp_lib_tuple_like // >= C++23 |
| 741 | template<typename _UTuple> |
| 742 | constexpr void |
| 743 | _M_assign(__tuple_like_tag_t, _UTuple&& __u) |
| 744 | { _M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u)); } |
| 745 | |
| 746 | template<typename _UTuple> |
| 747 | constexpr void |
| 748 | _M_assign(__tuple_like_tag_t, _UTuple&& __u) const |
| 749 | { _M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u)); } |
| 750 | #endif // C++23 |
| 751 | |
| 752 | protected: |
| 753 | _GLIBCXX20_CONSTEXPR |
| 754 | void |
| 755 | _M_swap(_Tuple_impl& __in) |
| 756 | { |
| 757 | using std::swap; |
| 758 | swap(_M_head(*this), _M_head(__in)); |
| 759 | } |
| 760 | |
| 761 | #if __cpp_lib_ranges_zip // >= C++23 |
| 762 | constexpr void |
| 763 | _M_swap(const _Tuple_impl& __in) const |
| 764 | { |
| 765 | using std::swap; |
| 766 | swap(_M_head(*this), _M_head(__in)); |
| 767 | } |
| 768 | #endif // C++23 |
| 769 | }; |
| 770 | |
| 771 | // Concept utility functions, reused in conditionally-explicit |
| 772 | // constructors. |
| 773 | template<bool, typename... _Types> |
| 774 | struct _TupleConstraints |
| 775 | { |
| 776 | template<typename... _UTypes> |
| 777 | using __constructible = __and_<is_constructible<_Types, _UTypes>...>; |
| 778 | |
| 779 | template<typename... _UTypes> |
| 780 | using __convertible = __and_<is_convertible<_UTypes, _Types>...>; |
| 781 | |
| 782 | // Constraint for a non-explicit constructor. |
| 783 | // True iff each Ti in _Types... can be constructed from Ui in _UTypes... |
| 784 | // and every Ui is implicitly convertible to Ti. |
| 785 | template<typename... _UTypes> |
| 786 | static constexpr bool __is_implicitly_constructible() |
| 787 | { |
| 788 | return __and_<__constructible<_UTypes...>, |
| 789 | __convertible<_UTypes...> |
| 790 | >::value; |
| 791 | } |
| 792 | |
| 793 | // Constraint for a non-explicit constructor. |
| 794 | // True iff each Ti in _Types... can be constructed from Ui in _UTypes... |
| 795 | // but not every Ui is implicitly convertible to Ti. |
| 796 | template<typename... _UTypes> |
| 797 | static constexpr bool __is_explicitly_constructible() |
| 798 | { |
| 799 | return __and_<__constructible<_UTypes...>, |
| 800 | __not_<__convertible<_UTypes...>> |
| 801 | >::value; |
| 802 | } |
| 803 | |
| 804 | static constexpr bool __is_implicitly_default_constructible() |
| 805 | { |
| 806 | return __and_<std::__is_implicitly_default_constructible<_Types>... |
| 807 | >::value; |
| 808 | } |
| 809 | |
| 810 | static constexpr bool __is_explicitly_default_constructible() |
| 811 | { |
| 812 | return __and_<is_default_constructible<_Types>..., |
| 813 | __not_<__and_< |
| 814 | std::__is_implicitly_default_constructible<_Types>...> |
| 815 | >>::value; |
| 816 | } |
| 817 | }; |
| 818 | |
| 819 | // Partial specialization used when a required precondition isn't met, |
| 820 | // e.g. when sizeof...(_Types) != sizeof...(_UTypes). |
| 821 | template<typename... _Types> |
| 822 | struct _TupleConstraints<false, _Types...> |
| 823 | { |
| 824 | template<typename... _UTypes> |
| 825 | static constexpr bool __is_implicitly_constructible() |
| 826 | { return false; } |
| 827 | |
| 828 | template<typename... _UTypes> |
| 829 | static constexpr bool __is_explicitly_constructible() |
| 830 | { return false; } |
| 831 | }; |
| 832 | /// @endcond |
| 833 | |
| 834 | /// Primary class template, tuple |
| 835 | template<typename... _Elements> |
| 836 | class tuple : public _Tuple_impl<0, _Elements...> |
| 837 | { |
| 838 | using _Inherited = _Tuple_impl<0, _Elements...>; |
| 839 | |
| 840 | #if __cpp_concepts && __cpp_consteval && __cpp_conditional_explicit // >= C++20 |
| 841 | template<typename... _UTypes> |
| 842 | static consteval bool |
| 843 | __constructible() |
| 844 | { |
| 845 | if constexpr (sizeof...(_UTypes) == sizeof...(_Elements)) |
| 846 | return __and_v<is_constructible<_Elements, _UTypes>...>; |
| 847 | else |
| 848 | return false; |
| 849 | } |
| 850 | |
| 851 | template<typename... _UTypes> |
| 852 | static consteval bool |
| 853 | __nothrow_constructible() |
| 854 | { |
| 855 | if constexpr (sizeof...(_UTypes) == sizeof...(_Elements)) |
| 856 | return __and_v<is_nothrow_constructible<_Elements, _UTypes>...>; |
| 857 | else |
| 858 | return false; |
| 859 | } |
| 860 | |
| 861 | template<typename... _UTypes> |
| 862 | static consteval bool |
| 863 | __convertible() |
| 864 | { |
| 865 | if constexpr (sizeof...(_UTypes) == sizeof...(_Elements)) |
| 866 | return __and_v<is_convertible<_UTypes, _Elements>...>; |
| 867 | else |
| 868 | return false; |
| 869 | } |
| 870 | |
| 871 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 872 | // 3121. tuple constructor constraints for UTypes&&... overloads |
| 873 | template<typename... _UTypes> |
| 874 | static consteval bool |
| 875 | __disambiguating_constraint() |
| 876 | { |
| 877 | if constexpr (sizeof...(_Elements) != sizeof...(_UTypes)) |
| 878 | return false; |
| 879 | else if constexpr (sizeof...(_Elements) == 1) |
| 880 | { |
| 881 | using _U0 = typename _Nth_type<0, _UTypes...>::type; |
| 882 | return !is_same_v<remove_cvref_t<_U0>, tuple>; |
| 883 | } |
| 884 | else if constexpr (sizeof...(_Elements) < 4) |
| 885 | { |
| 886 | using _U0 = typename _Nth_type<0, _UTypes...>::type; |
| 887 | if constexpr (!is_same_v<remove_cvref_t<_U0>, allocator_arg_t>) |
| 888 | return true; |
| 889 | else |
| 890 | { |
| 891 | using _T0 = typename _Nth_type<0, _Elements...>::type; |
| 892 | return is_same_v<remove_cvref_t<_T0>, allocator_arg_t>; |
| 893 | } |
| 894 | } |
| 895 | return true; |
| 896 | } |
| 897 | |
| 898 | // Return true iff sizeof...(Types) == 1 && tuple_size_v<TUPLE> == 1 |
| 899 | // and the single element in Types can be initialized from TUPLE, |
| 900 | // or is the same type as tuple_element_t<0, TUPLE>. |
| 901 | template<typename _Tuple> |
| 902 | static consteval bool |
| 903 | __use_other_ctor() |
| 904 | { |
| 905 | if constexpr (sizeof...(_Elements) != 1) |
| 906 | return false; |
| 907 | else if constexpr (is_same_v<remove_cvref_t<_Tuple>, tuple>) |
| 908 | return true; // Should use a copy/move constructor instead. |
| 909 | else |
| 910 | { |
| 911 | using _Tp = typename _Nth_type<0, _Elements...>::type; |
| 912 | if constexpr (is_convertible_v<_Tuple, _Tp>) |
| 913 | return true; |
| 914 | else if constexpr (is_constructible_v<_Tp, _Tuple>) |
| 915 | return true; |
| 916 | } |
| 917 | return false; |
| 918 | } |
| 919 | |
| 920 | template<typename... _Up> |
| 921 | static consteval bool |
| 922 | __dangles() |
| 923 | { |
| 924 | #if __has_builtin(__reference_constructs_from_temporary) |
| 925 | return (__reference_constructs_from_temporary(_Elements, _Up&&) |
| 926 | || ...); |
| 927 | #else |
| 928 | return false; |
| 929 | #endif |
| 930 | } |
| 931 | |
| 932 | #if __cpp_lib_tuple_like // >= C++23 |
| 933 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 934 | // 4045. tuple can create dangling references from tuple-like |
| 935 | template<typename _UTuple> |
| 936 | static consteval bool |
| 937 | __dangles_from_tuple_like() |
| 938 | { |
| 939 | return []<size_t... _Is>(index_sequence<_Is...>) { |
| 940 | return __dangles<decltype(std::get<_Is>(std::declval<_UTuple>()))...>(); |
| 941 | }(index_sequence_for<_Elements...>{}); |
| 942 | } |
| 943 | |
| 944 | template<typename _UTuple> |
| 945 | static consteval bool |
| 946 | __constructible_from_tuple_like() |
| 947 | { |
| 948 | return []<size_t... _Is>(index_sequence<_Is...>) { |
| 949 | return __constructible<decltype(std::get<_Is>(std::declval<_UTuple>()))...>(); |
| 950 | }(index_sequence_for<_Elements...>{}); |
| 951 | } |
| 952 | |
| 953 | template<typename _UTuple> |
| 954 | static consteval bool |
| 955 | __convertible_from_tuple_like() |
| 956 | { |
| 957 | return []<size_t... _Is>(index_sequence<_Is...>) { |
| 958 | return __convertible<decltype(std::get<_Is>(std::declval<_UTuple>()))...>(); |
| 959 | }(index_sequence_for<_Elements...>{}); |
| 960 | } |
| 961 | #endif // C++23 |
| 962 | |
| 963 | public: |
| 964 | constexpr |
| 965 | explicit(!(__is_implicitly_default_constructible_v<_Elements> && ...)) |
| 966 | tuple() |
| 967 | noexcept((is_nothrow_default_constructible_v<_Elements> && ...)) |
| 968 | requires (is_default_constructible_v<_Elements> && ...) |
| 969 | : _Inherited() |
| 970 | { } |
| 971 | |
| 972 | constexpr explicit(!__convertible<const _Elements&...>()) |
| 973 | tuple(const _Elements&... __elements) |
| 974 | noexcept(__nothrow_constructible<const _Elements&...>()) |
| 975 | requires (__constructible<const _Elements&...>()) |
| 976 | : _Inherited(__elements...) |
| 977 | { } |
| 978 | |
| 979 | template<typename... _UTypes> |
| 980 | requires (__disambiguating_constraint<_UTypes...>()) |
| 981 | && (__constructible<_UTypes...>()) |
| 982 | && (!__dangles<_UTypes...>()) |
| 983 | constexpr explicit(!__convertible<_UTypes...>()) |
| 984 | tuple(_UTypes&&... __u) |
| 985 | noexcept(__nothrow_constructible<_UTypes...>()) |
| 986 | : _Inherited(std::forward<_UTypes>(__u)...) |
| 987 | { } |
| 988 | |
| 989 | template<typename... _UTypes> |
| 990 | requires (__disambiguating_constraint<_UTypes...>()) |
| 991 | && (__constructible<_UTypes...>()) |
| 992 | && (__dangles<_UTypes...>()) |
| 993 | tuple(_UTypes&&...) = delete; |
| 994 | |
| 995 | constexpr tuple(const tuple&) = default; |
| 996 | |
| 997 | constexpr tuple(tuple&&) = default; |
| 998 | |
| 999 | template<typename... _UTypes> |
| 1000 | requires (__constructible<const _UTypes&...>()) |
| 1001 | && (!__use_other_ctor<const tuple<_UTypes...>&>()) |
| 1002 | && (!__dangles<const _UTypes&...>()) |
| 1003 | constexpr explicit(!__convertible<const _UTypes&...>()) |
| 1004 | tuple(const tuple<_UTypes...>& __u) |
| 1005 | noexcept(__nothrow_constructible<const _UTypes&...>()) |
| 1006 | : _Inherited(static_cast<const _Tuple_impl<0, _UTypes...>&>(__u)) |
| 1007 | { } |
| 1008 | |
| 1009 | template<typename... _UTypes> |
| 1010 | requires (__constructible<const _UTypes&...>()) |
| 1011 | && (!__use_other_ctor<const tuple<_UTypes...>&>()) |
| 1012 | && (__dangles<const _UTypes&...>()) |
| 1013 | tuple(const tuple<_UTypes...>&) = delete; |
| 1014 | |
| 1015 | template<typename... _UTypes> |
| 1016 | requires (__constructible<_UTypes...>()) |
| 1017 | && (!__use_other_ctor<tuple<_UTypes...>>()) |
| 1018 | && (!__dangles<_UTypes...>()) |
| 1019 | constexpr explicit(!__convertible<_UTypes...>()) |
| 1020 | tuple(tuple<_UTypes...>&& __u) |
| 1021 | noexcept(__nothrow_constructible<_UTypes...>()) |
| 1022 | : _Inherited(static_cast<_Tuple_impl<0, _UTypes...>&&>(__u)) |
| 1023 | { } |
| 1024 | |
| 1025 | template<typename... _UTypes> |
| 1026 | requires (__constructible<_UTypes...>()) |
| 1027 | && (!__use_other_ctor<tuple<_UTypes...>>()) |
| 1028 | && (__dangles<_UTypes...>()) |
| 1029 | tuple(tuple<_UTypes...>&&) = delete; |
| 1030 | |
| 1031 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1032 | template<typename... _UTypes> |
| 1033 | requires (__constructible<_UTypes&...>()) |
| 1034 | && (!__use_other_ctor<tuple<_UTypes...>&>()) |
| 1035 | && (!__dangles<_UTypes&...>()) |
| 1036 | constexpr explicit(!__convertible<_UTypes&...>()) |
| 1037 | tuple(tuple<_UTypes...>& __u) |
| 1038 | noexcept(__nothrow_constructible<_UTypes&...>()) |
| 1039 | : _Inherited(static_cast<_Tuple_impl<0, _UTypes...>&>(__u)) |
| 1040 | { } |
| 1041 | |
| 1042 | template<typename... _UTypes> |
| 1043 | requires (__constructible<_UTypes&...>()) |
| 1044 | && (!__use_other_ctor<tuple<_UTypes...>&>()) |
| 1045 | && (__dangles<_UTypes&...>()) |
| 1046 | tuple(tuple<_UTypes...>&) = delete; |
| 1047 | |
| 1048 | template<typename... _UTypes> |
| 1049 | requires (__constructible<const _UTypes...>()) |
| 1050 | && (!__use_other_ctor<const tuple<_UTypes...>>()) |
| 1051 | && (!__dangles<const _UTypes...>()) |
| 1052 | constexpr explicit(!__convertible<const _UTypes...>()) |
| 1053 | tuple(const tuple<_UTypes...>&& __u) |
| 1054 | noexcept(__nothrow_constructible<const _UTypes...>()) |
| 1055 | : _Inherited(static_cast<const _Tuple_impl<0, _UTypes...>&&>(__u)) |
| 1056 | { } |
| 1057 | |
| 1058 | template<typename... _UTypes> |
| 1059 | requires (__constructible<const _UTypes...>()) |
| 1060 | && (!__use_other_ctor<const tuple<_UTypes...>>()) |
| 1061 | && (__dangles<const _UTypes...>()) |
| 1062 | tuple(const tuple<_UTypes...>&&) = delete; |
| 1063 | #endif // C++23 |
| 1064 | |
| 1065 | template<typename _U1, typename _U2> |
| 1066 | requires (sizeof...(_Elements) == 2) |
| 1067 | && (__constructible<const _U1&, const _U2&>()) |
| 1068 | && (!__dangles<const _U1&, const _U2&>()) |
| 1069 | constexpr explicit(!__convertible<const _U1&, const _U2&>()) |
| 1070 | tuple(const pair<_U1, _U2>& __u) |
| 1071 | noexcept(__nothrow_constructible<const _U1&, const _U2&>()) |
| 1072 | : _Inherited(__u.first, __u.second) |
| 1073 | { } |
| 1074 | |
| 1075 | template<typename _U1, typename _U2> |
| 1076 | requires (sizeof...(_Elements) == 2) |
| 1077 | && (__constructible<const _U1&, const _U2&>()) |
| 1078 | && (__dangles<const _U1&, const _U2&>()) |
| 1079 | tuple(const pair<_U1, _U2>&) = delete; |
| 1080 | |
| 1081 | template<typename _U1, typename _U2> |
| 1082 | requires (sizeof...(_Elements) == 2) |
| 1083 | && (__constructible<_U1, _U2>()) |
| 1084 | && (!__dangles<_U1, _U2>()) |
| 1085 | constexpr explicit(!__convertible<_U1, _U2>()) |
| 1086 | tuple(pair<_U1, _U2>&& __u) |
| 1087 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 1088 | : _Inherited(std::forward<_U1>(__u.first), |
| 1089 | std::forward<_U2>(__u.second)) |
| 1090 | { } |
| 1091 | |
| 1092 | template<typename _U1, typename _U2> |
| 1093 | requires (sizeof...(_Elements) == 2) |
| 1094 | && (__constructible<_U1, _U2>()) |
| 1095 | && (__dangles<_U1, _U2>()) |
| 1096 | tuple(pair<_U1, _U2>&&) = delete; |
| 1097 | |
| 1098 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1099 | template<typename _U1, typename _U2> |
| 1100 | requires (sizeof...(_Elements) == 2) |
| 1101 | && (__constructible<_U1&, _U2&>()) |
| 1102 | && (!__dangles<_U1&, _U2&>()) |
| 1103 | constexpr explicit(!__convertible<_U1&, _U2&>()) |
| 1104 | tuple(pair<_U1, _U2>& __u) |
| 1105 | noexcept(__nothrow_constructible<_U1&, _U2&>()) |
| 1106 | : _Inherited(__u.first, __u.second) |
| 1107 | { } |
| 1108 | |
| 1109 | template<typename _U1, typename _U2> |
| 1110 | requires (sizeof...(_Elements) == 2) |
| 1111 | && (__constructible<_U1&, _U2&>()) |
| 1112 | && (__dangles<_U1&, _U2&>()) |
| 1113 | tuple(pair<_U1, _U2>&) = delete; |
| 1114 | |
| 1115 | template<typename _U1, typename _U2> |
| 1116 | requires (sizeof...(_Elements) == 2) |
| 1117 | && (__constructible<const _U1, const _U2>()) |
| 1118 | && (!__dangles<const _U1, const _U2>()) |
| 1119 | constexpr explicit(!__convertible<const _U1, const _U2>()) |
| 1120 | tuple(const pair<_U1, _U2>&& __u) |
| 1121 | noexcept(__nothrow_constructible<const _U1, const _U2>()) |
| 1122 | : _Inherited(std::forward<const _U1>(__u.first), |
| 1123 | std::forward<const _U2>(__u.second)) |
| 1124 | { } |
| 1125 | |
| 1126 | template<typename _U1, typename _U2> |
| 1127 | requires (sizeof...(_Elements) == 2) |
| 1128 | && (__constructible<const _U1, const _U2>()) |
| 1129 | && (__dangles<const _U1, const _U2>()) |
| 1130 | tuple(const pair<_U1, _U2>&&) = delete; |
| 1131 | #endif // C++23 |
| 1132 | |
| 1133 | #if __cpp_lib_tuple_like // >= C++23 |
| 1134 | template<__eligible_tuple_like<tuple> _UTuple> |
| 1135 | requires (__constructible_from_tuple_like<_UTuple>()) |
| 1136 | && (!__use_other_ctor<_UTuple>()) |
| 1137 | && (!__dangles_from_tuple_like<_UTuple>()) |
| 1138 | constexpr explicit(!__convertible_from_tuple_like<_UTuple>()) |
| 1139 | tuple(_UTuple&& __u) |
| 1140 | : _Inherited(__tuple_like_tag_t{}, |
| 1141 | std::forward<_UTuple>(__u), |
| 1142 | index_sequence_for<_Elements...>{}) |
| 1143 | { } |
| 1144 | |
| 1145 | template<__eligible_tuple_like<tuple> _UTuple> |
| 1146 | requires (__constructible_from_tuple_like<_UTuple>()) |
| 1147 | && (!__use_other_ctor<_UTuple>()) |
| 1148 | && (__dangles_from_tuple_like<_UTuple>()) |
| 1149 | tuple(_UTuple&&) = delete; |
| 1150 | #endif // C++23 |
| 1151 | |
| 1152 | // Allocator-extended constructors. |
| 1153 | |
| 1154 | template<typename _Alloc> |
| 1155 | constexpr |
| 1156 | explicit(!(__is_implicitly_default_constructible_v<_Elements> && ...)) |
| 1157 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
| 1158 | requires (is_default_constructible_v<_Elements> && ...) |
| 1159 | : _Inherited(__tag, __a) |
| 1160 | { } |
| 1161 | |
| 1162 | template<typename _Alloc> |
| 1163 | constexpr explicit(!__convertible<const _Elements&...>()) |
| 1164 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1165 | const _Elements&... __elements) |
| 1166 | requires (__constructible<const _Elements&...>()) |
| 1167 | : _Inherited(__tag, __a, __elements...) |
| 1168 | { } |
| 1169 | |
| 1170 | template<typename _Alloc, typename... _UTypes> |
| 1171 | requires (__disambiguating_constraint<_UTypes...>()) |
| 1172 | && (__constructible<_UTypes...>()) |
| 1173 | && (!__dangles<_UTypes...>()) |
| 1174 | constexpr explicit(!__convertible<_UTypes...>()) |
| 1175 | tuple(allocator_arg_t __tag, const _Alloc& __a, _UTypes&&... __u) |
| 1176 | : _Inherited(__tag, __a, std::forward<_UTypes>(__u)...) |
| 1177 | { } |
| 1178 | |
| 1179 | template<typename _Alloc, typename... _UTypes> |
| 1180 | requires (__disambiguating_constraint<_UTypes...>()) |
| 1181 | && (__constructible<_UTypes...>()) |
| 1182 | && (__dangles<_UTypes...>()) |
| 1183 | tuple(allocator_arg_t, const _Alloc&, _UTypes&&...) = delete; |
| 1184 | |
| 1185 | template<typename _Alloc> |
| 1186 | constexpr |
| 1187 | tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __u) |
| 1188 | : _Inherited(__tag, __a, static_cast<const _Inherited&>(__u)) |
| 1189 | { } |
| 1190 | |
| 1191 | template<typename _Alloc> |
| 1192 | requires (__constructible<_Elements...>()) |
| 1193 | constexpr |
| 1194 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __u) |
| 1195 | : _Inherited(__tag, __a, static_cast<_Inherited&&>(__u)) |
| 1196 | { } |
| 1197 | |
| 1198 | template<typename _Alloc, typename... _UTypes> |
| 1199 | requires (__constructible<const _UTypes&...>()) |
| 1200 | && (!__use_other_ctor<const tuple<_UTypes...>&>()) |
| 1201 | && (!__dangles<const _UTypes&...>()) |
| 1202 | constexpr explicit(!__convertible<const _UTypes&...>()) |
| 1203 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1204 | const tuple<_UTypes...>& __u) |
| 1205 | : _Inherited(__tag, __a, |
| 1206 | static_cast<const _Tuple_impl<0, _UTypes...>&>(__u)) |
| 1207 | { } |
| 1208 | |
| 1209 | template<typename _Alloc, typename... _UTypes> |
| 1210 | requires (__constructible<const _UTypes&...>()) |
| 1211 | && (!__use_other_ctor<const tuple<_UTypes...>&>()) |
| 1212 | && (__dangles<const _UTypes&...>()) |
| 1213 | tuple(allocator_arg_t, const _Alloc&, const tuple<_UTypes...>&) = delete; |
| 1214 | |
| 1215 | template<typename _Alloc, typename... _UTypes> |
| 1216 | requires (__constructible<_UTypes...>()) |
| 1217 | && (!__use_other_ctor<tuple<_UTypes...>>()) |
| 1218 | && (!__dangles<_UTypes...>()) |
| 1219 | constexpr explicit(!__use_other_ctor<tuple<_UTypes...>>()) |
| 1220 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_UTypes...>&& __u) |
| 1221 | : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _UTypes...>&&>(__u)) |
| 1222 | { } |
| 1223 | |
| 1224 | template<typename _Alloc, typename... _UTypes> |
| 1225 | requires (__constructible<_UTypes...>()) |
| 1226 | && (!__use_other_ctor<tuple<_UTypes...>>()) |
| 1227 | && (__dangles<_UTypes...>()) |
| 1228 | tuple(allocator_arg_t, const _Alloc&, tuple<_UTypes...>&&) = delete; |
| 1229 | |
| 1230 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1231 | template<typename _Alloc, typename... _UTypes> |
| 1232 | requires (__constructible<_UTypes&...>()) |
| 1233 | && (!__use_other_ctor<tuple<_UTypes...>&>()) |
| 1234 | && (!__dangles<_UTypes&...>()) |
| 1235 | constexpr explicit(!__convertible<_UTypes&...>()) |
| 1236 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_UTypes...>& __u) |
| 1237 | : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _UTypes...>&>(__u)) |
| 1238 | { } |
| 1239 | |
| 1240 | template<typename _Alloc, typename... _UTypes> |
| 1241 | requires (__constructible<_UTypes&...>()) |
| 1242 | && (!__use_other_ctor<tuple<_UTypes...>&>()) |
| 1243 | && (__dangles<_UTypes&...>()) |
| 1244 | tuple(allocator_arg_t, const _Alloc&, tuple<_UTypes...>&) = delete; |
| 1245 | |
| 1246 | template<typename _Alloc, typename... _UTypes> |
| 1247 | requires (__constructible<const _UTypes...>()) |
| 1248 | && (!__use_other_ctor<const tuple<_UTypes...>>()) |
| 1249 | && (!__dangles<const _UTypes...>()) |
| 1250 | constexpr explicit(!__convertible<const _UTypes...>()) |
| 1251 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1252 | const tuple<_UTypes...>&& __u) |
| 1253 | : _Inherited(__tag, __a, |
| 1254 | static_cast<const _Tuple_impl<0, _UTypes...>&&>(__u)) |
| 1255 | { } |
| 1256 | |
| 1257 | template<typename _Alloc, typename... _UTypes> |
| 1258 | requires (__constructible<const _UTypes...>()) |
| 1259 | && (!__use_other_ctor<const tuple<_UTypes...>>()) |
| 1260 | && (__dangles<const _UTypes...>()) |
| 1261 | tuple(allocator_arg_t, const _Alloc&, const tuple<_UTypes...>&&) = delete; |
| 1262 | #endif // C++23 |
| 1263 | |
| 1264 | template<typename _Alloc, typename _U1, typename _U2> |
| 1265 | requires (sizeof...(_Elements) == 2) |
| 1266 | && (__constructible<const _U1&, const _U2&>()) |
| 1267 | && (!__dangles<const _U1&, const _U2&>()) |
| 1268 | constexpr explicit(!__convertible<const _U1&, const _U2&>()) |
| 1269 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1270 | const pair<_U1, _U2>& __u) |
| 1271 | noexcept(__nothrow_constructible<const _U1&, const _U2&>()) |
| 1272 | : _Inherited(__tag, __a, __u.first, __u.second) |
| 1273 | { } |
| 1274 | |
| 1275 | template<typename _Alloc, typename _U1, typename _U2> |
| 1276 | requires (sizeof...(_Elements) == 2) |
| 1277 | && (__constructible<const _U1&, const _U2&>()) |
| 1278 | && (__dangles<const _U1&, const _U2&>()) |
| 1279 | tuple(allocator_arg_t, const _Alloc&, const pair<_U1, _U2>&) = delete; |
| 1280 | |
| 1281 | template<typename _Alloc, typename _U1, typename _U2> |
| 1282 | requires (sizeof...(_Elements) == 2) |
| 1283 | && (__constructible<_U1, _U2>()) |
| 1284 | && (!__dangles<_U1, _U2>()) |
| 1285 | constexpr explicit(!__convertible<_U1, _U2>()) |
| 1286 | tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __u) |
| 1287 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 1288 | : _Inherited(__tag, __a, std::move(__u.first), std::move(__u.second)) |
| 1289 | { } |
| 1290 | |
| 1291 | template<typename _Alloc, typename _U1, typename _U2> |
| 1292 | requires (sizeof...(_Elements) == 2) |
| 1293 | && (__constructible<_U1, _U2>()) |
| 1294 | && (__dangles<_U1, _U2>()) |
| 1295 | tuple(allocator_arg_t, const _Alloc&, pair<_U1, _U2>&&) = delete; |
| 1296 | |
| 1297 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1298 | template<typename _Alloc, typename _U1, typename _U2> |
| 1299 | requires (sizeof...(_Elements) == 2) |
| 1300 | && (__constructible<_U1&, _U2&>()) |
| 1301 | && (!__dangles<_U1&, _U2&>()) |
| 1302 | constexpr explicit(!__convertible<_U1&, _U2&>()) |
| 1303 | tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>& __u) |
| 1304 | noexcept(__nothrow_constructible<_U1&, _U2&>()) |
| 1305 | : _Inherited(__tag, __a, __u.first, __u.second) |
| 1306 | { } |
| 1307 | |
| 1308 | template<typename _Alloc, typename _U1, typename _U2> |
| 1309 | requires (sizeof...(_Elements) == 2) |
| 1310 | && (__constructible<_U1&, _U2&>()) |
| 1311 | && (__dangles<_U1&, _U2&>()) |
| 1312 | tuple(allocator_arg_t, const _Alloc&, pair<_U1, _U2>&) = delete; |
| 1313 | |
| 1314 | template<typename _Alloc, typename _U1, typename _U2> |
| 1315 | requires (sizeof...(_Elements) == 2) |
| 1316 | && (__constructible<const _U1, const _U2>()) |
| 1317 | && (!__dangles<const _U1, const _U2>()) |
| 1318 | constexpr explicit(!__convertible<const _U1, const _U2>()) |
| 1319 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1320 | const pair<_U1, _U2>&& __u) |
| 1321 | noexcept(__nothrow_constructible<const _U1, const _U2>()) |
| 1322 | : _Inherited(__tag, __a, std::move(__u.first), std::move(__u.second)) |
| 1323 | { } |
| 1324 | |
| 1325 | template<typename _Alloc, typename _U1, typename _U2> |
| 1326 | requires (sizeof...(_Elements) == 2) |
| 1327 | && (__constructible<const _U1, const _U2>()) |
| 1328 | && (__dangles<const _U1, const _U2>()) |
| 1329 | tuple(allocator_arg_t, const _Alloc&, const pair<_U1, _U2>&&) = delete; |
| 1330 | #endif // C++23 |
| 1331 | |
| 1332 | #if __cpp_lib_tuple_like // >= C++23 |
| 1333 | template<typename _Alloc, __eligible_tuple_like<tuple> _UTuple> |
| 1334 | requires (__constructible_from_tuple_like<_UTuple>()) |
| 1335 | && (!__use_other_ctor<_UTuple>()) |
| 1336 | && (!__dangles_from_tuple_like<_UTuple>()) |
| 1337 | constexpr explicit(!__convertible_from_tuple_like<_UTuple>()) |
| 1338 | tuple(allocator_arg_t __tag, const _Alloc& __a, _UTuple&& __u) |
| 1339 | : _Inherited(__tuple_like_tag_t{}, |
| 1340 | __tag, __a, std::forward<_UTuple>(__u), |
| 1341 | index_sequence_for<_Elements...>{}) |
| 1342 | { } |
| 1343 | |
| 1344 | template<typename _Alloc, __eligible_tuple_like<tuple> _UTuple> |
| 1345 | requires (__constructible_from_tuple_like<_UTuple>()) |
| 1346 | && (!__use_other_ctor<_UTuple>()) |
| 1347 | && (__dangles_from_tuple_like<_UTuple>()) |
| 1348 | tuple(allocator_arg_t, const _Alloc&, _UTuple&&) = delete; |
| 1349 | #endif // C++23 |
| 1350 | |
| 1351 | #else // !(concepts && conditional_explicit) |
| 1352 | |
| 1353 | template<bool _Cond> |
| 1354 | using _TCC = _TupleConstraints<_Cond, _Elements...>; |
| 1355 | |
| 1356 | // Constraint for non-explicit default constructor |
| 1357 | template<bool _Dummy> |
| 1358 | using _ImplicitDefaultCtor = __enable_if_t< |
| 1359 | _TCC<_Dummy>::__is_implicitly_default_constructible(), |
| 1360 | bool>; |
| 1361 | |
| 1362 | // Constraint for explicit default constructor |
| 1363 | template<bool _Dummy> |
| 1364 | using _ExplicitDefaultCtor = __enable_if_t< |
| 1365 | _TCC<_Dummy>::__is_explicitly_default_constructible(), |
| 1366 | bool>; |
| 1367 | |
| 1368 | // Constraint for non-explicit constructors |
| 1369 | template<bool _Cond, typename... _Args> |
| 1370 | using _ImplicitCtor = __enable_if_t< |
| 1371 | _TCC<_Cond>::template __is_implicitly_constructible<_Args...>(), |
| 1372 | bool>; |
| 1373 | |
| 1374 | // Constraint for non-explicit constructors |
| 1375 | template<bool _Cond, typename... _Args> |
| 1376 | using _ExplicitCtor = __enable_if_t< |
| 1377 | _TCC<_Cond>::template __is_explicitly_constructible<_Args...>(), |
| 1378 | bool>; |
| 1379 | |
| 1380 | // Condition for noexcept-specifier of a constructor. |
| 1381 | template<typename... _UElements> |
| 1382 | static constexpr bool __nothrow_constructible() |
| 1383 | { |
| 1384 | return |
| 1385 | __and_<is_nothrow_constructible<_Elements, _UElements>...>::value; |
| 1386 | } |
| 1387 | |
| 1388 | // Constraint for tuple(_UTypes&&...) where sizeof...(_UTypes) == 1. |
| 1389 | template<typename _Up> |
| 1390 | static constexpr bool __valid_args() |
| 1391 | { |
| 1392 | return sizeof...(_Elements) == 1 |
| 1393 | && !is_same<tuple, __remove_cvref_t<_Up>>::value; |
| 1394 | } |
| 1395 | |
| 1396 | // Constraint for tuple(_UTypes&&...) where sizeof...(_UTypes) > 1. |
| 1397 | template<typename, typename, typename... _Tail> |
| 1398 | static constexpr bool __valid_args() |
| 1399 | { return (sizeof...(_Tail) + 2) == sizeof...(_Elements); } |
| 1400 | |
| 1401 | /* Constraint for constructors with a tuple<UTypes...> parameter ensures |
| 1402 | * that the constructor is only viable when it would not interfere with |
| 1403 | * tuple(UTypes&&...) or tuple(const tuple&) or tuple(tuple&&). |
| 1404 | * Such constructors are only viable if: |
| 1405 | * either sizeof...(Types) != 1, |
| 1406 | * or (when Types... expands to T and UTypes... expands to U) |
| 1407 | * is_convertible_v<TUPLE, T>, is_constructible_v<T, TUPLE>, |
| 1408 | * and is_same_v<T, U> are all false. |
| 1409 | */ |
| 1410 | template<typename _Tuple, typename = tuple, |
| 1411 | typename = __remove_cvref_t<_Tuple>> |
| 1412 | struct _UseOtherCtor |
| 1413 | : false_type |
| 1414 | { }; |
| 1415 | // If TUPLE is convertible to the single element in *this, |
| 1416 | // then TUPLE should match tuple(UTypes&&...) instead. |
| 1417 | template<typename _Tuple, typename _Tp, typename _Up> |
| 1418 | struct _UseOtherCtor<_Tuple, tuple<_Tp>, tuple<_Up>> |
| 1419 | : __or_<is_convertible<_Tuple, _Tp>, is_constructible<_Tp, _Tuple>>::type |
| 1420 | { }; |
| 1421 | // If TUPLE and *this each have a single element of the same type, |
| 1422 | // then TUPLE should match a copy/move constructor instead. |
| 1423 | template<typename _Tuple, typename _Tp> |
| 1424 | struct _UseOtherCtor<_Tuple, tuple<_Tp>, tuple<_Tp>> |
| 1425 | : true_type |
| 1426 | { }; |
| 1427 | |
| 1428 | // Return true iff sizeof...(Types) == 1 && tuple_size_v<TUPLE> == 1 |
| 1429 | // and the single element in Types can be initialized from TUPLE, |
| 1430 | // or is the same type as tuple_element_t<0, TUPLE>. |
| 1431 | template<typename _Tuple> |
| 1432 | static constexpr bool __use_other_ctor() |
| 1433 | { return _UseOtherCtor<_Tuple>::value; } |
| 1434 | |
| 1435 | /// @cond undocumented |
| 1436 | #undef __glibcxx_no_dangling_refs |
| 1437 | #if __has_builtin(__reference_constructs_from_temporary) \ |
| 1438 | && defined _GLIBCXX_DEBUG |
| 1439 | // Error if construction from U... would create a dangling ref. |
| 1440 | # if __cpp_fold_expressions |
| 1441 | # define __glibcxx_dangling_refs(U) \ |
| 1442 | (__reference_constructs_from_temporary(_Elements, U) || ...) |
| 1443 | # else |
| 1444 | # define __glibcxx_dangling_refs(U) \ |
| 1445 | __or_<__bool_constant<__reference_constructs_from_temporary(_Elements, U) \ |
| 1446 | >...>::value |
| 1447 | # endif |
| 1448 | # define __glibcxx_no_dangling_refs(U) \ |
| 1449 | static_assert(!__glibcxx_dangling_refs(U), \ |
| 1450 | "std::tuple constructor creates a dangling reference") |
| 1451 | #else |
| 1452 | # define __glibcxx_no_dangling_refs(U) |
| 1453 | #endif |
| 1454 | /// @endcond |
| 1455 | |
| 1456 | public: |
| 1457 | template<typename _Dummy = void, |
| 1458 | _ImplicitDefaultCtor<is_void<_Dummy>::value> = true> |
| 1459 | constexpr |
| 1460 | tuple() |
| 1461 | noexcept(__and_<is_nothrow_default_constructible<_Elements>...>::value) |
| 1462 | : _Inherited() { } |
| 1463 | |
| 1464 | template<typename _Dummy = void, |
| 1465 | _ExplicitDefaultCtor<is_void<_Dummy>::value> = false> |
| 1466 | explicit constexpr |
| 1467 | tuple() |
| 1468 | noexcept(__and_<is_nothrow_default_constructible<_Elements>...>::value) |
| 1469 | : _Inherited() { } |
| 1470 | |
| 1471 | template<bool _NotEmpty = (sizeof...(_Elements) >= 1), |
| 1472 | _ImplicitCtor<_NotEmpty, const _Elements&...> = true> |
| 1473 | constexpr |
| 1474 | tuple(const _Elements&... __elements) |
| 1475 | noexcept(__nothrow_constructible<const _Elements&...>()) |
| 1476 | : _Inherited(__elements...) { } |
| 1477 | |
| 1478 | template<bool _NotEmpty = (sizeof...(_Elements) >= 1), |
| 1479 | _ExplicitCtor<_NotEmpty, const _Elements&...> = false> |
| 1480 | explicit constexpr |
| 1481 | tuple(const _Elements&... __elements) |
| 1482 | noexcept(__nothrow_constructible<const _Elements&...>()) |
| 1483 | : _Inherited(__elements...) { } |
| 1484 | |
| 1485 | template<typename... _UElements, |
| 1486 | bool _Valid = __valid_args<_UElements...>(), |
| 1487 | _ImplicitCtor<_Valid, _UElements...> = true> |
| 1488 | constexpr |
| 1489 | tuple(_UElements&&... __elements) |
| 1490 | noexcept(__nothrow_constructible<_UElements...>()) |
| 1491 | : _Inherited(std::forward<_UElements>(__elements)...) |
| 1492 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1493 | |
| 1494 | template<typename... _UElements, |
| 1495 | bool _Valid = __valid_args<_UElements...>(), |
| 1496 | _ExplicitCtor<_Valid, _UElements...> = false> |
| 1497 | explicit constexpr |
| 1498 | tuple(_UElements&&... __elements) |
| 1499 | noexcept(__nothrow_constructible<_UElements...>()) |
| 1500 | : _Inherited(std::forward<_UElements>(__elements)...) |
| 1501 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1502 | |
| 1503 | constexpr tuple(const tuple&) = default; |
| 1504 | |
| 1505 | constexpr tuple(tuple&&) = default; |
| 1506 | |
| 1507 | template<typename... _UElements, |
| 1508 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1509 | && !__use_other_ctor<const tuple<_UElements...>&>(), |
| 1510 | _ImplicitCtor<_Valid, const _UElements&...> = true> |
| 1511 | constexpr |
| 1512 | tuple(const tuple<_UElements...>& __in) |
| 1513 | noexcept(__nothrow_constructible<const _UElements&...>()) |
| 1514 | : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
| 1515 | { __glibcxx_no_dangling_refs(const _UElements&); } |
| 1516 | |
| 1517 | template<typename... _UElements, |
| 1518 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1519 | && !__use_other_ctor<const tuple<_UElements...>&>(), |
| 1520 | _ExplicitCtor<_Valid, const _UElements&...> = false> |
| 1521 | explicit constexpr |
| 1522 | tuple(const tuple<_UElements...>& __in) |
| 1523 | noexcept(__nothrow_constructible<const _UElements&...>()) |
| 1524 | : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
| 1525 | { __glibcxx_no_dangling_refs(const _UElements&); } |
| 1526 | |
| 1527 | template<typename... _UElements, |
| 1528 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1529 | && !__use_other_ctor<tuple<_UElements...>&&>(), |
| 1530 | _ImplicitCtor<_Valid, _UElements...> = true> |
| 1531 | constexpr |
| 1532 | tuple(tuple<_UElements...>&& __in) |
| 1533 | noexcept(__nothrow_constructible<_UElements...>()) |
| 1534 | : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
| 1535 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1536 | |
| 1537 | template<typename... _UElements, |
| 1538 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1539 | && !__use_other_ctor<tuple<_UElements...>&&>(), |
| 1540 | _ExplicitCtor<_Valid, _UElements...> = false> |
| 1541 | explicit constexpr |
| 1542 | tuple(tuple<_UElements...>&& __in) |
| 1543 | noexcept(__nothrow_constructible<_UElements...>()) |
| 1544 | : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
| 1545 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1546 | |
| 1547 | // Allocator-extended constructors. |
| 1548 | |
| 1549 | template<typename _Alloc, |
| 1550 | _ImplicitDefaultCtor<is_object<_Alloc>::value> = true> |
| 1551 | _GLIBCXX20_CONSTEXPR |
| 1552 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
| 1553 | : _Inherited(__tag, __a) { } |
| 1554 | |
| 1555 | template<typename _Alloc, |
| 1556 | _ExplicitDefaultCtor<is_object<_Alloc>::value> = false> |
| 1557 | _GLIBCXX20_CONSTEXPR |
| 1558 | explicit |
| 1559 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
| 1560 | : _Inherited(__tag, __a) { } |
| 1561 | |
| 1562 | template<typename _Alloc, bool _NotEmpty = (sizeof...(_Elements) >= 1), |
| 1563 | _ImplicitCtor<_NotEmpty, const _Elements&...> = true> |
| 1564 | _GLIBCXX20_CONSTEXPR |
| 1565 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1566 | const _Elements&... __elements) |
| 1567 | : _Inherited(__tag, __a, __elements...) { } |
| 1568 | |
| 1569 | template<typename _Alloc, bool _NotEmpty = (sizeof...(_Elements) >= 1), |
| 1570 | _ExplicitCtor<_NotEmpty, const _Elements&...> = false> |
| 1571 | _GLIBCXX20_CONSTEXPR |
| 1572 | explicit |
| 1573 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1574 | const _Elements&... __elements) |
| 1575 | : _Inherited(__tag, __a, __elements...) { } |
| 1576 | |
| 1577 | template<typename _Alloc, typename... _UElements, |
| 1578 | bool _Valid = __valid_args<_UElements...>(), |
| 1579 | _ImplicitCtor<_Valid, _UElements...> = true> |
| 1580 | _GLIBCXX20_CONSTEXPR |
| 1581 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1582 | _UElements&&... __elements) |
| 1583 | : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...) |
| 1584 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1585 | |
| 1586 | template<typename _Alloc, typename... _UElements, |
| 1587 | bool _Valid = __valid_args<_UElements...>(), |
| 1588 | _ExplicitCtor<_Valid, _UElements...> = false> |
| 1589 | _GLIBCXX20_CONSTEXPR |
| 1590 | explicit |
| 1591 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1592 | _UElements&&... __elements) |
| 1593 | : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...) |
| 1594 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1595 | |
| 1596 | template<typename _Alloc> |
| 1597 | _GLIBCXX20_CONSTEXPR |
| 1598 | tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in) |
| 1599 | : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { } |
| 1600 | |
| 1601 | template<typename _Alloc> |
| 1602 | _GLIBCXX20_CONSTEXPR |
| 1603 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in) |
| 1604 | : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { } |
| 1605 | |
| 1606 | template<typename _Alloc, typename... _UElements, |
| 1607 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1608 | && !__use_other_ctor<const tuple<_UElements...>&>(), |
| 1609 | _ImplicitCtor<_Valid, const _UElements&...> = true> |
| 1610 | _GLIBCXX20_CONSTEXPR |
| 1611 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1612 | const tuple<_UElements...>& __in) |
| 1613 | : _Inherited(__tag, __a, |
| 1614 | static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
| 1615 | { __glibcxx_no_dangling_refs(const _UElements&); } |
| 1616 | |
| 1617 | template<typename _Alloc, typename... _UElements, |
| 1618 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1619 | && !__use_other_ctor<const tuple<_UElements...>&>(), |
| 1620 | _ExplicitCtor<_Valid, const _UElements&...> = false> |
| 1621 | _GLIBCXX20_CONSTEXPR |
| 1622 | explicit |
| 1623 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1624 | const tuple<_UElements...>& __in) |
| 1625 | : _Inherited(__tag, __a, |
| 1626 | static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
| 1627 | { __glibcxx_no_dangling_refs(const _UElements&); } |
| 1628 | |
| 1629 | template<typename _Alloc, typename... _UElements, |
| 1630 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1631 | && !__use_other_ctor<tuple<_UElements...>&&>(), |
| 1632 | _ImplicitCtor<_Valid, _UElements...> = true> |
| 1633 | _GLIBCXX20_CONSTEXPR |
| 1634 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1635 | tuple<_UElements...>&& __in) |
| 1636 | : _Inherited(__tag, __a, |
| 1637 | static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
| 1638 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1639 | |
| 1640 | template<typename _Alloc, typename... _UElements, |
| 1641 | bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements)) |
| 1642 | && !__use_other_ctor<tuple<_UElements...>&&>(), |
| 1643 | _ExplicitCtor<_Valid, _UElements...> = false> |
| 1644 | _GLIBCXX20_CONSTEXPR |
| 1645 | explicit |
| 1646 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 1647 | tuple<_UElements...>&& __in) |
| 1648 | : _Inherited(__tag, __a, |
| 1649 | static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
| 1650 | { __glibcxx_no_dangling_refs(_UElements&&); } |
| 1651 | #endif // concepts && conditional_explicit |
| 1652 | |
| 1653 | // tuple assignment |
| 1654 | |
| 1655 | #if __cpp_concepts && __cpp_consteval // >= C++20 |
| 1656 | private: |
| 1657 | template<typename... _UTypes> |
| 1658 | static consteval bool |
| 1659 | __assignable() |
| 1660 | { |
| 1661 | if constexpr (sizeof...(_UTypes) == sizeof...(_Elements)) |
| 1662 | return __and_v<is_assignable<_Elements&, _UTypes>...>; |
| 1663 | else |
| 1664 | return false; |
| 1665 | } |
| 1666 | |
| 1667 | template<typename... _UTypes> |
| 1668 | static consteval bool |
| 1669 | __nothrow_assignable() |
| 1670 | { |
| 1671 | if constexpr (sizeof...(_UTypes) == sizeof...(_Elements)) |
| 1672 | return __and_v<is_nothrow_assignable<_Elements&, _UTypes>...>; |
| 1673 | else |
| 1674 | return false; |
| 1675 | } |
| 1676 | |
| 1677 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1678 | template<typename... _UTypes> |
| 1679 | static consteval bool |
| 1680 | __const_assignable() |
| 1681 | { |
| 1682 | if constexpr (sizeof...(_UTypes) == sizeof...(_Elements)) |
| 1683 | return __and_v<is_assignable<const _Elements&, _UTypes>...>; |
| 1684 | else |
| 1685 | return false; |
| 1686 | } |
| 1687 | #endif // C++23 |
| 1688 | |
| 1689 | #if __cpp_lib_tuple_like // >= C++23 |
| 1690 | template<typename _UTuple> |
| 1691 | static consteval bool |
| 1692 | __assignable_from_tuple_like() |
| 1693 | { |
| 1694 | return []<size_t... _Is>(index_sequence<_Is...>) { |
| 1695 | return __assignable<decltype(std::get<_Is>(std::declval<_UTuple>()))...>(); |
| 1696 | }(index_sequence_for<_Elements...>{}); |
| 1697 | } |
| 1698 | |
| 1699 | template<typename _UTuple> |
| 1700 | static consteval bool |
| 1701 | __const_assignable_from_tuple_like() |
| 1702 | { |
| 1703 | return []<size_t... _Is>(index_sequence<_Is...>) { |
| 1704 | return __const_assignable<decltype(std::get<_Is>(std::declval<_UTuple>()))...>(); |
| 1705 | }(index_sequence_for<_Elements...>{}); |
| 1706 | } |
| 1707 | #endif // C++23 |
| 1708 | |
| 1709 | public: |
| 1710 | |
| 1711 | tuple& operator=(const tuple& __u) = delete; |
| 1712 | |
| 1713 | constexpr tuple& |
| 1714 | operator=(const tuple& __u) |
| 1715 | noexcept(__nothrow_assignable<const _Elements&...>()) |
| 1716 | requires (__assignable<const _Elements&...>()) |
| 1717 | { |
| 1718 | this->_M_assign(__u); |
| 1719 | return *this; |
| 1720 | } |
| 1721 | |
| 1722 | constexpr tuple& |
| 1723 | operator=(tuple&& __u) |
| 1724 | noexcept(__nothrow_assignable<_Elements...>()) |
| 1725 | requires (__assignable<_Elements...>()) |
| 1726 | { |
| 1727 | this->_M_assign(std::move(__u)); |
| 1728 | return *this; |
| 1729 | } |
| 1730 | |
| 1731 | template<typename... _UTypes> |
| 1732 | requires (__assignable<const _UTypes&...>()) |
| 1733 | constexpr tuple& |
| 1734 | operator=(const tuple<_UTypes...>& __u) |
| 1735 | noexcept(__nothrow_assignable<const _UTypes&...>()) |
| 1736 | { |
| 1737 | this->_M_assign(__u); |
| 1738 | return *this; |
| 1739 | } |
| 1740 | |
| 1741 | template<typename... _UTypes> |
| 1742 | requires (__assignable<_UTypes...>()) |
| 1743 | constexpr tuple& |
| 1744 | operator=(tuple<_UTypes...>&& __u) |
| 1745 | noexcept(__nothrow_assignable<_UTypes...>()) |
| 1746 | { |
| 1747 | this->_M_assign(std::move(__u)); |
| 1748 | return *this; |
| 1749 | } |
| 1750 | |
| 1751 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1752 | constexpr const tuple& |
| 1753 | operator=(const tuple& __u) const |
| 1754 | requires (__const_assignable<const _Elements&...>()) |
| 1755 | { |
| 1756 | this->_M_assign(__u); |
| 1757 | return *this; |
| 1758 | } |
| 1759 | |
| 1760 | constexpr const tuple& |
| 1761 | operator=(tuple&& __u) const |
| 1762 | requires (__const_assignable<_Elements...>()) |
| 1763 | { |
| 1764 | this->_M_assign(std::move(__u)); |
| 1765 | return *this; |
| 1766 | } |
| 1767 | |
| 1768 | template<typename... _UTypes> |
| 1769 | constexpr const tuple& |
| 1770 | operator=(const tuple<_UTypes...>& __u) const |
| 1771 | requires (__const_assignable<const _UTypes&...>()) |
| 1772 | { |
| 1773 | this->_M_assign(__u); |
| 1774 | return *this; |
| 1775 | } |
| 1776 | |
| 1777 | template<typename... _UTypes> |
| 1778 | constexpr const tuple& |
| 1779 | operator=(tuple<_UTypes...>&& __u) const |
| 1780 | requires (__const_assignable<_UTypes...>()) |
| 1781 | { |
| 1782 | this->_M_assign(std::move(__u)); |
| 1783 | return *this; |
| 1784 | } |
| 1785 | #endif // C++23 |
| 1786 | |
| 1787 | template<typename _U1, typename _U2> |
| 1788 | requires (__assignable<const _U1&, const _U2&>()) |
| 1789 | constexpr tuple& |
| 1790 | operator=(const pair<_U1, _U2>& __u) |
| 1791 | noexcept(__nothrow_assignable<const _U1&, const _U2&>()) |
| 1792 | { |
| 1793 | this->_M_head(*this) = __u.first; |
| 1794 | this->_M_tail(*this)._M_head(*this) = __u.second; |
| 1795 | return *this; |
| 1796 | } |
| 1797 | |
| 1798 | template<typename _U1, typename _U2> |
| 1799 | requires (__assignable<_U1, _U2>()) |
| 1800 | constexpr tuple& |
| 1801 | operator=(pair<_U1, _U2>&& __u) |
| 1802 | noexcept(__nothrow_assignable<_U1, _U2>()) |
| 1803 | { |
| 1804 | this->_M_head(*this) = std::forward<_U1>(__u.first); |
| 1805 | this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__u.second); |
| 1806 | return *this; |
| 1807 | } |
| 1808 | |
| 1809 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1810 | template<typename _U1, typename _U2> |
| 1811 | requires (__const_assignable<const _U1&, const _U2>()) |
| 1812 | constexpr const tuple& |
| 1813 | operator=(const pair<_U1, _U2>& __u) const |
| 1814 | { |
| 1815 | this->_M_head(*this) = __u.first; |
| 1816 | this->_M_tail(*this)._M_head(*this) = __u.second; |
| 1817 | return *this; |
| 1818 | } |
| 1819 | |
| 1820 | template<typename _U1, typename _U2> |
| 1821 | requires (__const_assignable<_U1, _U2>()) |
| 1822 | constexpr const tuple& |
| 1823 | operator=(pair<_U1, _U2>&& __u) const |
| 1824 | { |
| 1825 | this->_M_head(*this) = std::forward<_U1>(__u.first); |
| 1826 | this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__u.second); |
| 1827 | return *this; |
| 1828 | } |
| 1829 | #endif // C++23 |
| 1830 | |
| 1831 | #if __cpp_lib_tuple_like // >= C++23 |
| 1832 | template<__eligible_tuple_like<tuple> _UTuple> |
| 1833 | requires (__assignable_from_tuple_like<_UTuple>()) |
| 1834 | constexpr tuple& |
| 1835 | operator=(_UTuple&& __u) |
| 1836 | { |
| 1837 | this->_M_assign(__tuple_like_tag_t{}, std::forward<_UTuple>(__u)); |
| 1838 | return *this; |
| 1839 | } |
| 1840 | |
| 1841 | template<__eligible_tuple_like<tuple> _UTuple> |
| 1842 | requires (__const_assignable_from_tuple_like<_UTuple>()) |
| 1843 | constexpr const tuple& |
| 1844 | operator=(_UTuple&& __u) const |
| 1845 | { |
| 1846 | this->_M_assign(__tuple_like_tag_t{}, std::forward<_UTuple>(__u)); |
| 1847 | return *this; |
| 1848 | } |
| 1849 | |
| 1850 | template<__tuple_like _UTuple> |
| 1851 | requires (!__is_tuple_v<_UTuple>) |
| 1852 | friend constexpr bool |
| 1853 | operator==(const tuple& __t, const _UTuple& __u) |
| 1854 | { |
| 1855 | static_assert(sizeof...(_Elements) == tuple_size_v<_UTuple>, |
| 1856 | "tuple objects can only be compared if they have equal sizes."); |
| 1857 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 1858 | return (bool(std::get<_Is>(__t) == std::get<_Is>(__u)) |
| 1859 | && ...); |
| 1860 | }(index_sequence_for<_Elements...>{}); |
| 1861 | } |
| 1862 | |
| 1863 | template<__tuple_like _UTuple, |
| 1864 | typename = make_index_sequence<tuple_size_v<_UTuple>>> |
| 1865 | struct __tuple_like_common_comparison_category; |
| 1866 | |
| 1867 | template<__tuple_like _UTuple, size_t... _Is> |
| 1868 | requires requires |
| 1869 | { typename void_t<__detail::__synth3way_t<_Elements, tuple_element_t<_Is, _UTuple>>...>; } |
| 1870 | struct __tuple_like_common_comparison_category<_UTuple, index_sequence<_Is...>> |
| 1871 | { |
| 1872 | using type = common_comparison_category_t |
| 1873 | <__detail::__synth3way_t<_Elements, tuple_element_t<_Is, _UTuple>>...>; |
| 1874 | }; |
| 1875 | |
| 1876 | template<__tuple_like _UTuple> |
| 1877 | requires (!__is_tuple_v<_UTuple>) |
| 1878 | friend constexpr typename __tuple_like_common_comparison_category<_UTuple>::type |
| 1879 | operator<=>(const tuple& __t, const _UTuple& __u) |
| 1880 | { |
| 1881 | using _Cat = typename __tuple_like_common_comparison_category<_UTuple>::type; |
| 1882 | return std::__tuple_cmp<_Cat>(__t, __u, index_sequence_for<_Elements...>()); |
| 1883 | } |
| 1884 | #endif // C++23 |
| 1885 | |
| 1886 | #else // ! (concepts && consteval) |
| 1887 | |
| 1888 | private: |
| 1889 | template<typename... _UElements> |
| 1890 | static constexpr |
| 1891 | __enable_if_t<sizeof...(_UElements) == sizeof...(_Elements), bool> |
| 1892 | __assignable() |
| 1893 | { return __and_<is_assignable<_Elements&, _UElements>...>::value; } |
| 1894 | |
| 1895 | // Condition for noexcept-specifier of an assignment operator. |
| 1896 | template<typename... _UElements> |
| 1897 | static constexpr bool __nothrow_assignable() |
| 1898 | { |
| 1899 | return |
| 1900 | __and_<is_nothrow_assignable<_Elements&, _UElements>...>::value; |
| 1901 | } |
| 1902 | |
| 1903 | public: |
| 1904 | |
| 1905 | _GLIBCXX20_CONSTEXPR |
| 1906 | tuple& |
| 1907 | operator=(__conditional_t<__assignable<const _Elements&...>(), |
| 1908 | const tuple&, |
| 1909 | const __nonesuch&> __in) |
| 1910 | noexcept(__nothrow_assignable<const _Elements&...>()) |
| 1911 | { |
| 1912 | this->_M_assign(__in); |
| 1913 | return *this; |
| 1914 | } |
| 1915 | |
| 1916 | _GLIBCXX20_CONSTEXPR |
| 1917 | tuple& |
| 1918 | operator=(__conditional_t<__assignable<_Elements...>(), |
| 1919 | tuple&&, |
| 1920 | __nonesuch&&> __in) |
| 1921 | noexcept(__nothrow_assignable<_Elements...>()) |
| 1922 | { |
| 1923 | this->_M_assign(std::move(__in)); |
| 1924 | return *this; |
| 1925 | } |
| 1926 | |
| 1927 | template<typename... _UElements> |
| 1928 | _GLIBCXX20_CONSTEXPR |
| 1929 | __enable_if_t<__assignable<const _UElements&...>(), tuple&> |
| 1930 | operator=(const tuple<_UElements...>& __in) |
| 1931 | noexcept(__nothrow_assignable<const _UElements&...>()) |
| 1932 | { |
| 1933 | this->_M_assign(__in); |
| 1934 | return *this; |
| 1935 | } |
| 1936 | |
| 1937 | template<typename... _UElements> |
| 1938 | _GLIBCXX20_CONSTEXPR |
| 1939 | __enable_if_t<__assignable<_UElements...>(), tuple&> |
| 1940 | operator=(tuple<_UElements...>&& __in) |
| 1941 | noexcept(__nothrow_assignable<_UElements...>()) |
| 1942 | { |
| 1943 | this->_M_assign(std::move(__in)); |
| 1944 | return *this; |
| 1945 | } |
| 1946 | #endif // concepts && consteval |
| 1947 | |
| 1948 | // tuple swap |
| 1949 | _GLIBCXX20_CONSTEXPR |
| 1950 | void |
| 1951 | swap(tuple& __in) |
| 1952 | noexcept(__and_<__is_nothrow_swappable<_Elements>...>::value) |
| 1953 | { _Inherited::_M_swap(__in); } |
| 1954 | |
| 1955 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1956 | // As an extension, we constrain the const swap member function in order |
| 1957 | // to continue accepting explicit instantiation of tuples whose elements |
| 1958 | // are not all const swappable. Without this constraint, such an |
| 1959 | // explicit instantiation would also instantiate the ill-formed body of |
| 1960 | // this function and yield a hard error. This constraint shouldn't |
| 1961 | // affect the behavior of valid programs. |
| 1962 | constexpr void |
| 1963 | swap(const tuple& __in) const |
| 1964 | noexcept(__and_v<__is_nothrow_swappable<const _Elements>...>) |
| 1965 | requires (is_swappable_v<const _Elements> && ...) |
| 1966 | { _Inherited::_M_swap(__in); } |
| 1967 | #endif // C++23 |
| 1968 | }; |
| 1969 | |
| 1970 | #if __cpp_deduction_guides >= 201606 |
| 1971 | template<typename... _UTypes> |
| 1972 | tuple(_UTypes...) -> tuple<_UTypes...>; |
| 1973 | template<typename _T1, typename _T2> |
| 1974 | tuple(pair<_T1, _T2>) -> tuple<_T1, _T2>; |
| 1975 | template<typename _Alloc, typename... _UTypes> |
| 1976 | tuple(allocator_arg_t, _Alloc, _UTypes...) -> tuple<_UTypes...>; |
| 1977 | template<typename _Alloc, typename _T1, typename _T2> |
| 1978 | tuple(allocator_arg_t, _Alloc, pair<_T1, _T2>) -> tuple<_T1, _T2>; |
| 1979 | template<typename _Alloc, typename... _UTypes> |
| 1980 | tuple(allocator_arg_t, _Alloc, tuple<_UTypes...>) -> tuple<_UTypes...>; |
| 1981 | #endif |
| 1982 | |
| 1983 | // Explicit specialization, zero-element tuple. |
| 1984 | template<> |
| 1985 | class tuple<> |
| 1986 | { |
| 1987 | public: |
| 1988 | _GLIBCXX20_CONSTEXPR |
| 1989 | void swap(tuple&) noexcept { /* no-op */ } |
| 1990 | #if __cpp_lib_ranges_zip // >= C++23 |
| 1991 | constexpr void swap(const tuple&) const noexcept { /* no-op */ } |
| 1992 | #endif |
| 1993 | // We need the default since we're going to define no-op |
| 1994 | // allocator constructors. |
| 1995 | tuple() = default; |
| 1996 | // No-op allocator constructors. |
| 1997 | template<typename _Alloc> |
| 1998 | _GLIBCXX20_CONSTEXPR |
| 1999 | tuple(allocator_arg_t, const _Alloc&) noexcept { } |
| 2000 | template<typename _Alloc> |
| 2001 | _GLIBCXX20_CONSTEXPR |
| 2002 | tuple(allocator_arg_t, const _Alloc&, const tuple&) noexcept { } |
| 2003 | }; |
| 2004 | |
| 2005 | #if !(__cpp_concepts && __cpp_consteval && __cpp_conditional_explicit) // !C++20 |
| 2006 | /// Partial specialization, 2-element tuple. |
| 2007 | /// Includes construction and assignment from a pair. |
| 2008 | template<typename _T1, typename _T2> |
| 2009 | class tuple<_T1, _T2> : public _Tuple_impl<0, _T1, _T2> |
| 2010 | { |
| 2011 | typedef _Tuple_impl<0, _T1, _T2> _Inherited; |
| 2012 | |
| 2013 | // Constraint for non-explicit default constructor |
| 2014 | template<bool _Dummy, typename _U1, typename _U2> |
| 2015 | using _ImplicitDefaultCtor = __enable_if_t< |
| 2016 | _TupleConstraints<_Dummy, _U1, _U2>:: |
| 2017 | __is_implicitly_default_constructible(), |
| 2018 | bool>; |
| 2019 | |
| 2020 | // Constraint for explicit default constructor |
| 2021 | template<bool _Dummy, typename _U1, typename _U2> |
| 2022 | using _ExplicitDefaultCtor = __enable_if_t< |
| 2023 | _TupleConstraints<_Dummy, _U1, _U2>:: |
| 2024 | __is_explicitly_default_constructible(), |
| 2025 | bool>; |
| 2026 | |
| 2027 | template<bool _Dummy> |
| 2028 | using _TCC = _TupleConstraints<_Dummy, _T1, _T2>; |
| 2029 | |
| 2030 | // Constraint for non-explicit constructors |
| 2031 | template<bool _Cond, typename _U1, typename _U2> |
| 2032 | using _ImplicitCtor = __enable_if_t< |
| 2033 | _TCC<_Cond>::template __is_implicitly_constructible<_U1, _U2>(), |
| 2034 | bool>; |
| 2035 | |
| 2036 | // Constraint for non-explicit constructors |
| 2037 | template<bool _Cond, typename _U1, typename _U2> |
| 2038 | using _ExplicitCtor = __enable_if_t< |
| 2039 | _TCC<_Cond>::template __is_explicitly_constructible<_U1, _U2>(), |
| 2040 | bool>; |
| 2041 | |
| 2042 | template<typename _U1, typename _U2> |
| 2043 | static constexpr bool __assignable() |
| 2044 | { |
| 2045 | return __and_<is_assignable<_T1&, _U1>, |
| 2046 | is_assignable<_T2&, _U2>>::value; |
| 2047 | } |
| 2048 | |
| 2049 | template<typename _U1, typename _U2> |
| 2050 | static constexpr bool __nothrow_assignable() |
| 2051 | { |
| 2052 | return __and_<is_nothrow_assignable<_T1&, _U1>, |
| 2053 | is_nothrow_assignable<_T2&, _U2>>::value; |
| 2054 | } |
| 2055 | |
| 2056 | template<typename _U1, typename _U2> |
| 2057 | static constexpr bool __nothrow_constructible() |
| 2058 | { |
| 2059 | return __and_<is_nothrow_constructible<_T1, _U1>, |
| 2060 | is_nothrow_constructible<_T2, _U2>>::value; |
| 2061 | } |
| 2062 | |
| 2063 | static constexpr bool __nothrow_default_constructible() |
| 2064 | { |
| 2065 | return __and_<is_nothrow_default_constructible<_T1>, |
| 2066 | is_nothrow_default_constructible<_T2>>::value; |
| 2067 | } |
| 2068 | |
| 2069 | template<typename _U1> |
| 2070 | static constexpr bool __is_alloc_arg() |
| 2071 | { return is_same<__remove_cvref_t<_U1>, allocator_arg_t>::value; } |
| 2072 | |
| 2073 | /// @cond undocumented |
| 2074 | #undef __glibcxx_no_dangling_refs |
| 2075 | // Error if construction from _U1 and _U2 would create a dangling ref. |
| 2076 | #if __has_builtin(__reference_constructs_from_temporary) \ |
| 2077 | && defined _GLIBCXX_DEBUG |
| 2078 | # define __glibcxx_no_dangling_refs(_U1, _U2) \ |
| 2079 | static_assert(!__reference_constructs_from_temporary(_T1, _U1) \ |
| 2080 | && !__reference_constructs_from_temporary(_T2, _U2), \ |
| 2081 | "std::tuple constructor creates a dangling reference") |
| 2082 | #else |
| 2083 | # define __glibcxx_no_dangling_refs(_U1, _U2) |
| 2084 | #endif |
| 2085 | /// @endcond |
| 2086 | |
| 2087 | public: |
| 2088 | template<bool _Dummy = true, |
| 2089 | _ImplicitDefaultCtor<_Dummy, _T1, _T2> = true> |
| 2090 | constexpr |
| 2091 | tuple() |
| 2092 | noexcept(__nothrow_default_constructible()) |
| 2093 | : _Inherited() { } |
| 2094 | |
| 2095 | template<bool _Dummy = true, |
| 2096 | _ExplicitDefaultCtor<_Dummy, _T1, _T2> = false> |
| 2097 | explicit constexpr |
| 2098 | tuple() |
| 2099 | noexcept(__nothrow_default_constructible()) |
| 2100 | : _Inherited() { } |
| 2101 | |
| 2102 | template<bool _Dummy = true, |
| 2103 | _ImplicitCtor<_Dummy, const _T1&, const _T2&> = true> |
| 2104 | constexpr |
| 2105 | tuple(const _T1& __a1, const _T2& __a2) |
| 2106 | noexcept(__nothrow_constructible<const _T1&, const _T2&>()) |
| 2107 | : _Inherited(__a1, __a2) { } |
| 2108 | |
| 2109 | template<bool _Dummy = true, |
| 2110 | _ExplicitCtor<_Dummy, const _T1&, const _T2&> = false> |
| 2111 | explicit constexpr |
| 2112 | tuple(const _T1& __a1, const _T2& __a2) |
| 2113 | noexcept(__nothrow_constructible<const _T1&, const _T2&>()) |
| 2114 | : _Inherited(__a1, __a2) { } |
| 2115 | |
| 2116 | template<typename _U1, typename _U2, |
| 2117 | _ImplicitCtor<!__is_alloc_arg<_U1>(), _U1, _U2> = true> |
| 2118 | constexpr |
| 2119 | tuple(_U1&& __a1, _U2&& __a2) |
| 2120 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 2121 | : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) |
| 2122 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2123 | |
| 2124 | template<typename _U1, typename _U2, |
| 2125 | _ExplicitCtor<!__is_alloc_arg<_U1>(), _U1, _U2> = false> |
| 2126 | explicit constexpr |
| 2127 | tuple(_U1&& __a1, _U2&& __a2) |
| 2128 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 2129 | : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) |
| 2130 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2131 | |
| 2132 | constexpr tuple(const tuple&) = default; |
| 2133 | |
| 2134 | constexpr tuple(tuple&&) = default; |
| 2135 | |
| 2136 | template<typename _U1, typename _U2, |
| 2137 | _ImplicitCtor<true, const _U1&, const _U2&> = true> |
| 2138 | constexpr |
| 2139 | tuple(const tuple<_U1, _U2>& __in) |
| 2140 | noexcept(__nothrow_constructible<const _U1&, const _U2&>()) |
| 2141 | : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
| 2142 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2143 | |
| 2144 | template<typename _U1, typename _U2, |
| 2145 | _ExplicitCtor<true, const _U1&, const _U2&> = false> |
| 2146 | explicit constexpr |
| 2147 | tuple(const tuple<_U1, _U2>& __in) |
| 2148 | noexcept(__nothrow_constructible<const _U1&, const _U2&>()) |
| 2149 | : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
| 2150 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2151 | |
| 2152 | template<typename _U1, typename _U2, |
| 2153 | _ImplicitCtor<true, _U1, _U2> = true> |
| 2154 | constexpr |
| 2155 | tuple(tuple<_U1, _U2>&& __in) |
| 2156 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 2157 | : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
| 2158 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2159 | |
| 2160 | template<typename _U1, typename _U2, |
| 2161 | _ExplicitCtor<true, _U1, _U2> = false> |
| 2162 | explicit constexpr |
| 2163 | tuple(tuple<_U1, _U2>&& __in) |
| 2164 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 2165 | : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
| 2166 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2167 | |
| 2168 | template<typename _U1, typename _U2, |
| 2169 | _ImplicitCtor<true, const _U1&, const _U2&> = true> |
| 2170 | constexpr |
| 2171 | tuple(const pair<_U1, _U2>& __in) |
| 2172 | noexcept(__nothrow_constructible<const _U1&, const _U2&>()) |
| 2173 | : _Inherited(__in.first, __in.second) |
| 2174 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2175 | |
| 2176 | template<typename _U1, typename _U2, |
| 2177 | _ExplicitCtor<true, const _U1&, const _U2&> = false> |
| 2178 | explicit constexpr |
| 2179 | tuple(const pair<_U1, _U2>& __in) |
| 2180 | noexcept(__nothrow_constructible<const _U1&, const _U2&>()) |
| 2181 | : _Inherited(__in.first, __in.second) |
| 2182 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2183 | |
| 2184 | template<typename _U1, typename _U2, |
| 2185 | _ImplicitCtor<true, _U1, _U2> = true> |
| 2186 | constexpr |
| 2187 | tuple(pair<_U1, _U2>&& __in) |
| 2188 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 2189 | : _Inherited(std::forward<_U1>(__in.first), |
| 2190 | std::forward<_U2>(__in.second)) |
| 2191 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2192 | |
| 2193 | template<typename _U1, typename _U2, |
| 2194 | _ExplicitCtor<true, _U1, _U2> = false> |
| 2195 | explicit constexpr |
| 2196 | tuple(pair<_U1, _U2>&& __in) |
| 2197 | noexcept(__nothrow_constructible<_U1, _U2>()) |
| 2198 | : _Inherited(std::forward<_U1>(__in.first), |
| 2199 | std::forward<_U2>(__in.second)) |
| 2200 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2201 | |
| 2202 | // Allocator-extended constructors. |
| 2203 | |
| 2204 | template<typename _Alloc, |
| 2205 | _ImplicitDefaultCtor<is_object<_Alloc>::value, _T1, _T2> = true> |
| 2206 | _GLIBCXX20_CONSTEXPR |
| 2207 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
| 2208 | : _Inherited(__tag, __a) { } |
| 2209 | |
| 2210 | template<typename _Alloc, |
| 2211 | _ExplicitDefaultCtor<is_object<_Alloc>::value, _T1, _T2> = false> |
| 2212 | _GLIBCXX20_CONSTEXPR |
| 2213 | explicit |
| 2214 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
| 2215 | : _Inherited(__tag, __a) { } |
| 2216 | |
| 2217 | template<typename _Alloc, bool _Dummy = true, |
| 2218 | _ImplicitCtor<_Dummy, const _T1&, const _T2&> = true> |
| 2219 | _GLIBCXX20_CONSTEXPR |
| 2220 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2221 | const _T1& __a1, const _T2& __a2) |
| 2222 | : _Inherited(__tag, __a, __a1, __a2) { } |
| 2223 | |
| 2224 | template<typename _Alloc, bool _Dummy = true, |
| 2225 | _ExplicitCtor<_Dummy, const _T1&, const _T2&> = false> |
| 2226 | explicit |
| 2227 | _GLIBCXX20_CONSTEXPR |
| 2228 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2229 | const _T1& __a1, const _T2& __a2) |
| 2230 | : _Inherited(__tag, __a, __a1, __a2) { } |
| 2231 | |
| 2232 | template<typename _Alloc, typename _U1, typename _U2, |
| 2233 | _ImplicitCtor<true, _U1, _U2> = true> |
| 2234 | _GLIBCXX20_CONSTEXPR |
| 2235 | tuple(allocator_arg_t __tag, const _Alloc& __a, _U1&& __a1, _U2&& __a2) |
| 2236 | : _Inherited(__tag, __a, std::forward<_U1>(__a1), |
| 2237 | std::forward<_U2>(__a2)) |
| 2238 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2239 | |
| 2240 | template<typename _Alloc, typename _U1, typename _U2, |
| 2241 | _ExplicitCtor<true, _U1, _U2> = false> |
| 2242 | explicit |
| 2243 | _GLIBCXX20_CONSTEXPR |
| 2244 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2245 | _U1&& __a1, _U2&& __a2) |
| 2246 | : _Inherited(__tag, __a, std::forward<_U1>(__a1), |
| 2247 | std::forward<_U2>(__a2)) |
| 2248 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2249 | |
| 2250 | template<typename _Alloc> |
| 2251 | _GLIBCXX20_CONSTEXPR |
| 2252 | tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in) |
| 2253 | : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { } |
| 2254 | |
| 2255 | template<typename _Alloc> |
| 2256 | _GLIBCXX20_CONSTEXPR |
| 2257 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in) |
| 2258 | : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { } |
| 2259 | |
| 2260 | template<typename _Alloc, typename _U1, typename _U2, |
| 2261 | _ImplicitCtor<true, const _U1&, const _U2&> = true> |
| 2262 | _GLIBCXX20_CONSTEXPR |
| 2263 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2264 | const tuple<_U1, _U2>& __in) |
| 2265 | : _Inherited(__tag, __a, |
| 2266 | static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
| 2267 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2268 | |
| 2269 | template<typename _Alloc, typename _U1, typename _U2, |
| 2270 | _ExplicitCtor<true, const _U1&, const _U2&> = false> |
| 2271 | explicit |
| 2272 | _GLIBCXX20_CONSTEXPR |
| 2273 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2274 | const tuple<_U1, _U2>& __in) |
| 2275 | : _Inherited(__tag, __a, |
| 2276 | static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
| 2277 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2278 | |
| 2279 | template<typename _Alloc, typename _U1, typename _U2, |
| 2280 | _ImplicitCtor<true, _U1, _U2> = true> |
| 2281 | _GLIBCXX20_CONSTEXPR |
| 2282 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1, _U2>&& __in) |
| 2283 | : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
| 2284 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2285 | |
| 2286 | template<typename _Alloc, typename _U1, typename _U2, |
| 2287 | _ExplicitCtor<true, _U1, _U2> = false> |
| 2288 | explicit |
| 2289 | _GLIBCXX20_CONSTEXPR |
| 2290 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1, _U2>&& __in) |
| 2291 | : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
| 2292 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2293 | |
| 2294 | template<typename _Alloc, typename _U1, typename _U2, |
| 2295 | _ImplicitCtor<true, const _U1&, const _U2&> = true> |
| 2296 | _GLIBCXX20_CONSTEXPR |
| 2297 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2298 | const pair<_U1, _U2>& __in) |
| 2299 | : _Inherited(__tag, __a, __in.first, __in.second) |
| 2300 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2301 | |
| 2302 | template<typename _Alloc, typename _U1, typename _U2, |
| 2303 | _ExplicitCtor<true, const _U1&, const _U2&> = false> |
| 2304 | explicit |
| 2305 | _GLIBCXX20_CONSTEXPR |
| 2306 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
| 2307 | const pair<_U1, _U2>& __in) |
| 2308 | : _Inherited(__tag, __a, __in.first, __in.second) |
| 2309 | { __glibcxx_no_dangling_refs(const _U1&, const _U2&); } |
| 2310 | |
| 2311 | template<typename _Alloc, typename _U1, typename _U2, |
| 2312 | _ImplicitCtor<true, _U1, _U2> = true> |
| 2313 | _GLIBCXX20_CONSTEXPR |
| 2314 | tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in) |
| 2315 | : _Inherited(__tag, __a, std::forward<_U1>(__in.first), |
| 2316 | std::forward<_U2>(__in.second)) |
| 2317 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2318 | |
| 2319 | template<typename _Alloc, typename _U1, typename _U2, |
| 2320 | _ExplicitCtor<true, _U1, _U2> = false> |
| 2321 | explicit |
| 2322 | _GLIBCXX20_CONSTEXPR |
| 2323 | tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in) |
| 2324 | : _Inherited(__tag, __a, std::forward<_U1>(__in.first), |
| 2325 | std::forward<_U2>(__in.second)) |
| 2326 | { __glibcxx_no_dangling_refs(_U1&&, _U2&&); } |
| 2327 | |
| 2328 | // Tuple assignment. |
| 2329 | |
| 2330 | _GLIBCXX20_CONSTEXPR |
| 2331 | tuple& |
| 2332 | operator=(__conditional_t<__assignable<const _T1&, const _T2&>(), |
| 2333 | const tuple&, |
| 2334 | const __nonesuch&> __in) |
| 2335 | noexcept(__nothrow_assignable<const _T1&, const _T2&>()) |
| 2336 | { |
| 2337 | this->_M_assign(__in); |
| 2338 | return *this; |
| 2339 | } |
| 2340 | |
| 2341 | _GLIBCXX20_CONSTEXPR |
| 2342 | tuple& |
| 2343 | operator=(__conditional_t<__assignable<_T1, _T2>(), |
| 2344 | tuple&&, |
| 2345 | __nonesuch&&> __in) |
| 2346 | noexcept(__nothrow_assignable<_T1, _T2>()) |
| 2347 | { |
| 2348 | this->_M_assign(std::move(__in)); |
| 2349 | return *this; |
| 2350 | } |
| 2351 | |
| 2352 | template<typename _U1, typename _U2> |
| 2353 | _GLIBCXX20_CONSTEXPR |
| 2354 | __enable_if_t<__assignable<const _U1&, const _U2&>(), tuple&> |
| 2355 | operator=(const tuple<_U1, _U2>& __in) |
| 2356 | noexcept(__nothrow_assignable<const _U1&, const _U2&>()) |
| 2357 | { |
| 2358 | this->_M_assign(__in); |
| 2359 | return *this; |
| 2360 | } |
| 2361 | |
| 2362 | template<typename _U1, typename _U2> |
| 2363 | _GLIBCXX20_CONSTEXPR |
| 2364 | __enable_if_t<__assignable<_U1, _U2>(), tuple&> |
| 2365 | operator=(tuple<_U1, _U2>&& __in) |
| 2366 | noexcept(__nothrow_assignable<_U1, _U2>()) |
| 2367 | { |
| 2368 | this->_M_assign(std::move(__in)); |
| 2369 | return *this; |
| 2370 | } |
| 2371 | |
| 2372 | template<typename _U1, typename _U2> |
| 2373 | _GLIBCXX20_CONSTEXPR |
| 2374 | __enable_if_t<__assignable<const _U1&, const _U2&>(), tuple&> |
| 2375 | operator=(const pair<_U1, _U2>& __in) |
| 2376 | noexcept(__nothrow_assignable<const _U1&, const _U2&>()) |
| 2377 | { |
| 2378 | this->_M_head(*this) = __in.first; |
| 2379 | this->_M_tail(*this)._M_head(*this) = __in.second; |
| 2380 | return *this; |
| 2381 | } |
| 2382 | |
| 2383 | template<typename _U1, typename _U2> |
| 2384 | _GLIBCXX20_CONSTEXPR |
| 2385 | __enable_if_t<__assignable<_U1, _U2>(), tuple&> |
| 2386 | operator=(pair<_U1, _U2>&& __in) |
| 2387 | noexcept(__nothrow_assignable<_U1, _U2>()) |
| 2388 | { |
| 2389 | this->_M_head(*this) = std::forward<_U1>(__in.first); |
| 2390 | this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__in.second); |
| 2391 | return *this; |
| 2392 | } |
| 2393 | |
| 2394 | _GLIBCXX20_CONSTEXPR |
| 2395 | void |
| 2396 | swap(tuple& __in) |
| 2397 | noexcept(__and_<__is_nothrow_swappable<_T1>, |
| 2398 | __is_nothrow_swappable<_T2>>::value) |
| 2399 | { _Inherited::_M_swap(__in); } |
| 2400 | }; |
| 2401 | #endif // concepts && conditional_explicit |
| 2402 | |
| 2403 | /// class tuple_size |
| 2404 | template<typename... _Elements> |
| 2405 | struct tuple_size<tuple<_Elements...>> |
| 2406 | : public integral_constant<size_t, sizeof...(_Elements)> { }; |
| 2407 | |
| 2408 | #if __cplusplus >= 201703L |
| 2409 | template<typename... _Types> |
| 2410 | inline constexpr size_t tuple_size_v<tuple<_Types...>> |
| 2411 | = sizeof...(_Types); |
| 2412 | |
| 2413 | template<typename... _Types> |
| 2414 | inline constexpr size_t tuple_size_v<const tuple<_Types...>> |
| 2415 | = sizeof...(_Types); |
| 2416 | #endif |
| 2417 | |
| 2418 | /// Trait to get the Ith element type from a tuple. |
| 2419 | template<size_t __i, typename... _Types> |
| 2420 | struct tuple_element<__i, tuple<_Types...>> |
| 2421 | { |
| 2422 | static_assert(__i < sizeof...(_Types), "tuple index must be in range"); |
| 2423 | |
| 2424 | using type = typename _Nth_type<__i, _Types...>::type; |
| 2425 | }; |
| 2426 | |
| 2427 | template<size_t __i, typename _Head, typename... _Tail> |
| 2428 | constexpr _Head& |
| 2429 | __get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
| 2430 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
| 2431 | |
| 2432 | template<size_t __i, typename _Head, typename... _Tail> |
| 2433 | constexpr const _Head& |
| 2434 | __get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
| 2435 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
| 2436 | |
| 2437 | // Deleted overload to improve diagnostics for invalid indices |
| 2438 | template<size_t __i, typename... _Types> |
| 2439 | __enable_if_t<(__i >= sizeof...(_Types))> |
| 2440 | __get_helper(const tuple<_Types...>&) = delete; |
| 2441 | |
| 2442 | /// Return a reference to the ith element of a tuple. |
| 2443 | template<size_t __i, typename... _Elements> |
| 2444 | constexpr __tuple_element_t<__i, tuple<_Elements...>>& |
| 2445 | get(tuple<_Elements...>& __t) noexcept |
| 2446 | { return std::__get_helper<__i>(__t); } |
| 2447 | |
| 2448 | /// Return a const reference to the ith element of a const tuple. |
| 2449 | template<size_t __i, typename... _Elements> |
| 2450 | constexpr const __tuple_element_t<__i, tuple<_Elements...>>& |
| 2451 | get(const tuple<_Elements...>& __t) noexcept |
| 2452 | { return std::__get_helper<__i>(__t); } |
| 2453 | |
| 2454 | /// Return an rvalue reference to the ith element of a tuple rvalue. |
| 2455 | template<size_t __i, typename... _Elements> |
| 2456 | constexpr __tuple_element_t<__i, tuple<_Elements...>>&& |
| 2457 | get(tuple<_Elements...>&& __t) noexcept |
| 2458 | { |
| 2459 | typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type; |
| 2460 | return std::forward<__element_type>(std::__get_helper<__i>(__t)); |
| 2461 | } |
| 2462 | |
| 2463 | /// Return a const rvalue reference to the ith element of a const tuple rvalue. |
| 2464 | template<size_t __i, typename... _Elements> |
| 2465 | constexpr const __tuple_element_t<__i, tuple<_Elements...>>&& |
| 2466 | get(const tuple<_Elements...>&& __t) noexcept |
| 2467 | { |
| 2468 | typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type; |
| 2469 | return std::forward<const __element_type>(std::__get_helper<__i>(__t)); |
| 2470 | } |
| 2471 | |
| 2472 | /// @cond undocumented |
| 2473 | // Deleted overload chosen for invalid indices. |
| 2474 | template<size_t __i, typename... _Elements> |
| 2475 | constexpr __enable_if_t<(__i >= sizeof...(_Elements))> |
| 2476 | get(const tuple<_Elements...>&) = delete; |
| 2477 | /// @endcond |
| 2478 | |
| 2479 | #ifdef __cpp_lib_tuples_by_type // C++ >= 14 |
| 2480 | /// Return a reference to the unique element of type _Tp of a tuple. |
| 2481 | template <typename _Tp, typename... _Types> |
| 2482 | constexpr _Tp& |
| 2483 | get(tuple<_Types...>& __t) noexcept |
| 2484 | { |
| 2485 | constexpr size_t __idx = __find_uniq_type_in_pack<_Tp, _Types...>(); |
| 2486 | static_assert(__idx < sizeof...(_Types), |
| 2487 | "the type T in std::get<T> must occur exactly once in the tuple"); |
| 2488 | return std::__get_helper<__idx>(__t); |
| 2489 | } |
| 2490 | |
| 2491 | /// Return a reference to the unique element of type _Tp of a tuple rvalue. |
| 2492 | template <typename _Tp, typename... _Types> |
| 2493 | constexpr _Tp&& |
| 2494 | get(tuple<_Types...>&& __t) noexcept |
| 2495 | { |
| 2496 | constexpr size_t __idx = __find_uniq_type_in_pack<_Tp, _Types...>(); |
| 2497 | static_assert(__idx < sizeof...(_Types), |
| 2498 | "the type T in std::get<T> must occur exactly once in the tuple"); |
| 2499 | return std::forward<_Tp>(std::__get_helper<__idx>(__t)); |
| 2500 | } |
| 2501 | |
| 2502 | /// Return a const reference to the unique element of type _Tp of a tuple. |
| 2503 | template <typename _Tp, typename... _Types> |
| 2504 | constexpr const _Tp& |
| 2505 | get(const tuple<_Types...>& __t) noexcept |
| 2506 | { |
| 2507 | constexpr size_t __idx = __find_uniq_type_in_pack<_Tp, _Types...>(); |
| 2508 | static_assert(__idx < sizeof...(_Types), |
| 2509 | "the type T in std::get<T> must occur exactly once in the tuple"); |
| 2510 | return std::__get_helper<__idx>(__t); |
| 2511 | } |
| 2512 | |
| 2513 | /// Return a const reference to the unique element of type _Tp of |
| 2514 | /// a const tuple rvalue. |
| 2515 | template <typename _Tp, typename... _Types> |
| 2516 | constexpr const _Tp&& |
| 2517 | get(const tuple<_Types...>&& __t) noexcept |
| 2518 | { |
| 2519 | constexpr size_t __idx = __find_uniq_type_in_pack<_Tp, _Types...>(); |
| 2520 | static_assert(__idx < sizeof...(_Types), |
| 2521 | "the type T in std::get<T> must occur exactly once in the tuple"); |
| 2522 | return std::forward<const _Tp>(std::__get_helper<__idx>(__t)); |
| 2523 | } |
| 2524 | #endif |
| 2525 | |
| 2526 | // This class performs the comparison operations on tuples |
| 2527 | template<typename _Tp, typename _Up, size_t __i, size_t __size> |
| 2528 | struct __tuple_compare |
| 2529 | { |
| 2530 | static constexpr bool |
| 2531 | __eq(const _Tp& __t, const _Up& __u) |
| 2532 | { |
| 2533 | return bool(std::get<__i>(__t) == std::get<__i>(__u)) |
| 2534 | && __tuple_compare<_Tp, _Up, __i + 1, __size>::__eq(__t, __u); |
| 2535 | } |
| 2536 | |
| 2537 | static constexpr bool |
| 2538 | __less(const _Tp& __t, const _Up& __u) |
| 2539 | { |
| 2540 | return bool(std::get<__i>(__t) < std::get<__i>(__u)) |
| 2541 | || (!bool(std::get<__i>(__u) < std::get<__i>(__t)) |
| 2542 | && __tuple_compare<_Tp, _Up, __i + 1, __size>::__less(__t, __u)); |
| 2543 | } |
| 2544 | }; |
| 2545 | |
| 2546 | template<typename _Tp, typename _Up, size_t __size> |
| 2547 | struct __tuple_compare<_Tp, _Up, __size, __size> |
| 2548 | { |
| 2549 | static constexpr bool |
| 2550 | __eq(const _Tp&, const _Up&) { return true; } |
| 2551 | |
| 2552 | static constexpr bool |
| 2553 | __less(const _Tp&, const _Up&) { return false; } |
| 2554 | }; |
| 2555 | |
| 2556 | template<typename... _TElements, typename... _UElements> |
| 2557 | constexpr bool |
| 2558 | operator==(const tuple<_TElements...>& __t, |
| 2559 | const tuple<_UElements...>& __u) |
| 2560 | { |
| 2561 | static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
| 2562 | "tuple objects can only be compared if they have equal sizes."); |
| 2563 | using __compare = __tuple_compare<tuple<_TElements...>, |
| 2564 | tuple<_UElements...>, |
| 2565 | 0, sizeof...(_TElements)>; |
| 2566 | return __compare::__eq(__t, __u); |
| 2567 | } |
| 2568 | |
| 2569 | #if __cpp_lib_three_way_comparison |
| 2570 | template<typename _Cat, typename _Tp, typename _Up> |
| 2571 | constexpr _Cat |
| 2572 | __tuple_cmp(const _Tp&, const _Up&, index_sequence<>) |
| 2573 | { return _Cat::equivalent; } |
| 2574 | |
| 2575 | template<typename _Cat, typename _Tp, typename _Up, |
| 2576 | size_t _Idx0, size_t... _Idxs> |
| 2577 | constexpr _Cat |
| 2578 | __tuple_cmp(const _Tp& __t, const _Up& __u, |
| 2579 | index_sequence<_Idx0, _Idxs...>) |
| 2580 | { |
| 2581 | auto __c |
| 2582 | = __detail::__synth3way(std::get<_Idx0>(__t), std::get<_Idx0>(__u)); |
| 2583 | if (__c != 0) |
| 2584 | return __c; |
| 2585 | return std::__tuple_cmp<_Cat>(__t, __u, index_sequence<_Idxs...>()); |
| 2586 | } |
| 2587 | |
| 2588 | template<typename... _Tps, typename... _Ups> |
| 2589 | constexpr |
| 2590 | common_comparison_category_t<__detail::__synth3way_t<_Tps, _Ups>...> |
| 2591 | operator<=>(const tuple<_Tps...>& __t, const tuple<_Ups...>& __u) |
| 2592 | { |
| 2593 | using _Cat |
| 2594 | = common_comparison_category_t<__detail::__synth3way_t<_Tps, _Ups>...>; |
| 2595 | return std::__tuple_cmp<_Cat>(__t, __u, index_sequence_for<_Tps...>()); |
| 2596 | } |
| 2597 | #else |
| 2598 | template<typename... _TElements, typename... _UElements> |
| 2599 | constexpr bool |
| 2600 | operator<(const tuple<_TElements...>& __t, |
| 2601 | const tuple<_UElements...>& __u) |
| 2602 | { |
| 2603 | static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
| 2604 | "tuple objects can only be compared if they have equal sizes."); |
| 2605 | using __compare = __tuple_compare<tuple<_TElements...>, |
| 2606 | tuple<_UElements...>, |
| 2607 | 0, sizeof...(_TElements)>; |
| 2608 | return __compare::__less(__t, __u); |
| 2609 | } |
| 2610 | |
| 2611 | template<typename... _TElements, typename... _UElements> |
| 2612 | constexpr bool |
| 2613 | operator!=(const tuple<_TElements...>& __t, |
| 2614 | const tuple<_UElements...>& __u) |
| 2615 | { return !(__t == __u); } |
| 2616 | |
| 2617 | template<typename... _TElements, typename... _UElements> |
| 2618 | constexpr bool |
| 2619 | operator>(const tuple<_TElements...>& __t, |
| 2620 | const tuple<_UElements...>& __u) |
| 2621 | { return __u < __t; } |
| 2622 | |
| 2623 | template<typename... _TElements, typename... _UElements> |
| 2624 | constexpr bool |
| 2625 | operator<=(const tuple<_TElements...>& __t, |
| 2626 | const tuple<_UElements...>& __u) |
| 2627 | { return !(__u < __t); } |
| 2628 | |
| 2629 | template<typename... _TElements, typename... _UElements> |
| 2630 | constexpr bool |
| 2631 | operator>=(const tuple<_TElements...>& __t, |
| 2632 | const tuple<_UElements...>& __u) |
| 2633 | { return !(__t < __u); } |
| 2634 | #endif // three_way_comparison |
| 2635 | |
| 2636 | // NB: DR 705. |
| 2637 | /// Create a tuple containing copies of the arguments |
| 2638 | template<typename... _Elements> |
| 2639 | constexpr tuple<typename __decay_and_strip<_Elements>::__type...> |
| 2640 | make_tuple(_Elements&&... __args) |
| 2641 | { |
| 2642 | typedef tuple<typename __decay_and_strip<_Elements>::__type...> |
| 2643 | __result_type; |
| 2644 | return __result_type(std::forward<_Elements>(__args)...); |
| 2645 | } |
| 2646 | |
| 2647 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2648 | // 2275. Why is forward_as_tuple not constexpr? |
| 2649 | /// Create a tuple of lvalue or rvalue references to the arguments |
| 2650 | template<typename... _Elements> |
| 2651 | constexpr tuple<_Elements&&...> |
| 2652 | forward_as_tuple(_Elements&&... __args) noexcept |
| 2653 | { return tuple<_Elements&&...>(std::forward<_Elements>(__args)...); } |
| 2654 | |
| 2655 | /// @cond undocumented |
| 2656 | template<size_t, typename, typename, size_t> |
| 2657 | struct __make_tuple_impl; |
| 2658 | |
| 2659 | template<size_t _Idx, typename _Tuple, typename... _Tp, size_t _Nm> |
| 2660 | struct __make_tuple_impl<_Idx, tuple<_Tp...>, _Tuple, _Nm> |
| 2661 | : __make_tuple_impl<_Idx + 1, |
| 2662 | tuple<_Tp..., __tuple_element_t<_Idx, _Tuple>>, |
| 2663 | _Tuple, _Nm> |
| 2664 | { }; |
| 2665 | |
| 2666 | template<size_t _Nm, typename _Tuple, typename... _Tp> |
| 2667 | struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm> |
| 2668 | { |
| 2669 | typedef tuple<_Tp...> __type; |
| 2670 | }; |
| 2671 | |
| 2672 | template<typename _Tuple> |
| 2673 | struct __do_make_tuple |
| 2674 | : __make_tuple_impl<0, tuple<>, _Tuple, tuple_size<_Tuple>::value> |
| 2675 | { }; |
| 2676 | |
| 2677 | // Returns the std::tuple equivalent of a tuple-like type. |
| 2678 | template<typename _Tuple> |
| 2679 | struct __make_tuple |
| 2680 | : public __do_make_tuple<__remove_cvref_t<_Tuple>> |
| 2681 | { }; |
| 2682 | |
| 2683 | // Combines several std::tuple's into a single one. |
| 2684 | template<typename...> |
| 2685 | struct __combine_tuples; |
| 2686 | |
| 2687 | template<> |
| 2688 | struct __combine_tuples<> |
| 2689 | { |
| 2690 | typedef tuple<> __type; |
| 2691 | }; |
| 2692 | |
| 2693 | template<typename... _Ts> |
| 2694 | struct __combine_tuples<tuple<_Ts...>> |
| 2695 | { |
| 2696 | typedef tuple<_Ts...> __type; |
| 2697 | }; |
| 2698 | |
| 2699 | template<typename... _T1s, typename... _T2s, typename... _Rem> |
| 2700 | struct __combine_tuples<tuple<_T1s...>, tuple<_T2s...>, _Rem...> |
| 2701 | { |
| 2702 | typedef typename __combine_tuples<tuple<_T1s..., _T2s...>, |
| 2703 | _Rem...>::__type __type; |
| 2704 | }; |
| 2705 | |
| 2706 | // Computes the result type of tuple_cat given a set of tuple-like types. |
| 2707 | template<typename... _Tpls> |
| 2708 | struct __tuple_cat_result |
| 2709 | { |
| 2710 | typedef typename __combine_tuples |
| 2711 | <typename __make_tuple<_Tpls>::__type...>::__type __type; |
| 2712 | }; |
| 2713 | |
| 2714 | // Helper to determine the index set for the first tuple-like |
| 2715 | // type of a given set. |
| 2716 | template<typename...> |
| 2717 | struct __make_1st_indices; |
| 2718 | |
| 2719 | template<> |
| 2720 | struct __make_1st_indices<> |
| 2721 | { |
| 2722 | typedef _Index_tuple<> __type; |
| 2723 | }; |
| 2724 | |
| 2725 | template<typename _Tp, typename... _Tpls> |
| 2726 | struct __make_1st_indices<_Tp, _Tpls...> |
| 2727 | { |
| 2728 | typedef typename _Build_index_tuple<tuple_size< |
| 2729 | typename remove_reference<_Tp>::type>::value>::__type __type; |
| 2730 | }; |
| 2731 | |
| 2732 | // Performs the actual concatenation by step-wise expanding tuple-like |
| 2733 | // objects into the elements, which are finally forwarded into the |
| 2734 | // result tuple. |
| 2735 | template<typename _Ret, typename _Indices, typename... _Tpls> |
| 2736 | struct __tuple_concater; |
| 2737 | |
| 2738 | template<typename _Ret, size_t... _Is, typename _Tp, typename... _Tpls> |
| 2739 | struct __tuple_concater<_Ret, _Index_tuple<_Is...>, _Tp, _Tpls...> |
| 2740 | { |
| 2741 | template<typename... _Us> |
| 2742 | static constexpr _Ret |
| 2743 | _S_do(_Tp&& __tp, _Tpls&&... __tps, _Us&&... __us) |
| 2744 | { |
| 2745 | typedef typename __make_1st_indices<_Tpls...>::__type __idx; |
| 2746 | typedef __tuple_concater<_Ret, __idx, _Tpls...> __next; |
| 2747 | return __next::_S_do(std::forward<_Tpls>(__tps)..., |
| 2748 | std::forward<_Us>(__us)..., |
| 2749 | std::get<_Is>(std::forward<_Tp>(__tp))...); |
| 2750 | } |
| 2751 | }; |
| 2752 | |
| 2753 | template<typename _Ret> |
| 2754 | struct __tuple_concater<_Ret, _Index_tuple<>> |
| 2755 | { |
| 2756 | template<typename... _Us> |
| 2757 | static constexpr _Ret |
| 2758 | _S_do(_Us&&... __us) |
| 2759 | { |
| 2760 | return _Ret(std::forward<_Us>(__us)...); |
| 2761 | } |
| 2762 | }; |
| 2763 | |
| 2764 | template<typename... _Tps> |
| 2765 | struct __is_tuple_like_impl<tuple<_Tps...>> : true_type |
| 2766 | { }; |
| 2767 | /// @endcond |
| 2768 | |
| 2769 | /// Create a `tuple` containing all elements from multiple tuple-like objects |
| 2770 | #if __cpp_lib_tuple_like // >= C++23 |
| 2771 | template<__tuple_like... _Tpls> |
| 2772 | #else |
| 2773 | template<typename... _Tpls, typename = typename |
| 2774 | enable_if<__and_<__is_tuple_like<_Tpls>...>::value>::type> |
| 2775 | #endif |
| 2776 | constexpr auto |
| 2777 | tuple_cat(_Tpls&&... __tpls) |
| 2778 | -> typename __tuple_cat_result<_Tpls...>::__type |
| 2779 | { |
| 2780 | typedef typename __tuple_cat_result<_Tpls...>::__type __ret; |
| 2781 | typedef typename __make_1st_indices<_Tpls...>::__type __idx; |
| 2782 | typedef __tuple_concater<__ret, __idx, _Tpls...> __concater; |
| 2783 | return __concater::_S_do(std::forward<_Tpls>(__tpls)...); |
| 2784 | } |
| 2785 | |
| 2786 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2787 | // 2301. Why is tie not constexpr? |
| 2788 | /// Return a tuple of lvalue references bound to the arguments |
| 2789 | template<typename... _Elements> |
| 2790 | constexpr tuple<_Elements&...> |
| 2791 | tie(_Elements&... __args) noexcept |
| 2792 | { return tuple<_Elements&...>(__args...); } |
| 2793 | |
| 2794 | /// Exchange the values of two tuples |
| 2795 | template<typename... _Elements> |
| 2796 | _GLIBCXX20_CONSTEXPR |
| 2797 | inline |
| 2798 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
| 2799 | // Constrained free swap overload, see p0185r1 |
| 2800 | typename enable_if<__and_<__is_swappable<_Elements>...>::value |
| 2801 | >::type |
| 2802 | #else |
| 2803 | void |
| 2804 | #endif |
| 2805 | swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y) |
| 2806 | noexcept(noexcept(__x.swap(__y))) |
| 2807 | { __x.swap(__y); } |
| 2808 | |
| 2809 | #if __cpp_lib_ranges_zip // >= C++23 |
| 2810 | template<typename... _Elements> |
| 2811 | requires (is_swappable_v<const _Elements> && ...) |
| 2812 | constexpr void |
| 2813 | swap(const tuple<_Elements...>& __x, const tuple<_Elements...>& __y) |
| 2814 | noexcept(noexcept(__x.swap(__y))) |
| 2815 | { __x.swap(__y); } |
| 2816 | #endif // C++23 |
| 2817 | |
| 2818 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
| 2819 | /// Exchange the values of two const tuples (if const elements can be swapped) |
| 2820 | template<typename... _Elements> |
| 2821 | _GLIBCXX20_CONSTEXPR |
| 2822 | typename enable_if<!__and_<__is_swappable<_Elements>...>::value>::type |
| 2823 | swap(tuple<_Elements...>&, tuple<_Elements...>&) = delete; |
| 2824 | #endif |
| 2825 | |
| 2826 | // A class (and instance) which can be used in 'tie' when an element |
| 2827 | // of a tuple is not required. |
| 2828 | // _GLIBCXX14_CONSTEXPR |
| 2829 | // 2933. PR for LWG 2773 could be clearer |
| 2830 | struct _Swallow_assign |
| 2831 | { |
| 2832 | template<class _Tp> |
| 2833 | _GLIBCXX14_CONSTEXPR const _Swallow_assign& |
| 2834 | operator=(const _Tp&) const |
| 2835 | { return *this; } |
| 2836 | }; |
| 2837 | |
| 2838 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2839 | // 2773. Making std::ignore constexpr |
| 2840 | /** Used with `std::tie` to ignore an element of a tuple |
| 2841 | * |
| 2842 | * When using `std::tie` to assign the elements of a tuple to variables, |
| 2843 | * unwanted elements can be ignored by using `std::ignore`. For example: |
| 2844 | * |
| 2845 | * ``` |
| 2846 | * int x, y; |
| 2847 | * std::tie(x, std::ignore, y) = std::make_tuple(1, 2, 3); |
| 2848 | * ``` |
| 2849 | * |
| 2850 | * This assignment will perform `x=1; std::ignore=2; y=3;` which results |
| 2851 | * in the second element being ignored. |
| 2852 | * |
| 2853 | * @since C++11 |
| 2854 | */ |
| 2855 | _GLIBCXX17_INLINE constexpr _Swallow_assign ignore{}; |
| 2856 | |
| 2857 | /// Partial specialization for tuples |
| 2858 | template<typename... _Types, typename _Alloc> |
| 2859 | struct uses_allocator<tuple<_Types...>, _Alloc> : true_type { }; |
| 2860 | |
| 2861 | // See stl_pair.h... |
| 2862 | /** "piecewise construction" using a tuple of arguments for each member. |
| 2863 | * |
| 2864 | * @param __first Arguments for the first member of the pair. |
| 2865 | * @param __second Arguments for the second member of the pair. |
| 2866 | * |
| 2867 | * The elements of each tuple will be used as the constructor arguments |
| 2868 | * for the data members of the pair. |
| 2869 | */ |
| 2870 | template<class _T1, class _T2> |
| 2871 | template<typename... _Args1, typename... _Args2> |
| 2872 | _GLIBCXX20_CONSTEXPR |
| 2873 | inline |
| 2874 | pair<_T1, _T2>:: |
| 2875 | pair(piecewise_construct_t, |
| 2876 | tuple<_Args1...> __first, tuple<_Args2...> __second) |
| 2877 | : pair(__first, __second, |
| 2878 | typename _Build_index_tuple<sizeof...(_Args1)>::__type(), |
| 2879 | typename _Build_index_tuple<sizeof...(_Args2)>::__type()) |
| 2880 | { } |
| 2881 | |
| 2882 | template<class _T1, class _T2> |
| 2883 | template<typename... _Args1, size_t... _Indexes1, |
| 2884 | typename... _Args2, size_t... _Indexes2> |
| 2885 | _GLIBCXX20_CONSTEXPR inline |
| 2886 | pair<_T1, _T2>:: |
| 2887 | pair(tuple<_Args1...>& __tuple1, tuple<_Args2...>& __tuple2, |
| 2888 | _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>) |
| 2889 | : first(std::forward<_Args1>(std::get<_Indexes1>(__tuple1))...), |
| 2890 | second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...) |
| 2891 | { } |
| 2892 | |
| 2893 | #if defined(__cpp_lib_apply) || defined(__cpp_lib_make_from_tuple) // C++ >= 17 |
| 2894 | // Unpack a std::tuple into a type trait and use its value. |
| 2895 | // For cv std::tuple<_Up> the result is _Trait<_Tp, cv _Up...>::value. |
| 2896 | // For cv std::tuple<_Up>& the result is _Trait<_Tp, cv _Up&...>::value. |
| 2897 | // Otherwise the result is false (because we don't know if std::get throws). |
| 2898 | template<template<typename...> class _Trait, typename _Tp, typename _Tuple> |
| 2899 | inline constexpr bool __unpack_std_tuple = false; |
| 2900 | |
| 2901 | template<template<typename...> class _Trait, typename _Tp, typename... _Up> |
| 2902 | inline constexpr bool __unpack_std_tuple<_Trait, _Tp, tuple<_Up...>> |
| 2903 | = _Trait<_Tp, _Up...>::value; |
| 2904 | |
| 2905 | template<template<typename...> class _Trait, typename _Tp, typename... _Up> |
| 2906 | inline constexpr bool __unpack_std_tuple<_Trait, _Tp, tuple<_Up...>&> |
| 2907 | = _Trait<_Tp, _Up&...>::value; |
| 2908 | |
| 2909 | template<template<typename...> class _Trait, typename _Tp, typename... _Up> |
| 2910 | inline constexpr bool __unpack_std_tuple<_Trait, _Tp, const tuple<_Up...>> |
| 2911 | = _Trait<_Tp, const _Up...>::value; |
| 2912 | |
| 2913 | template<template<typename...> class _Trait, typename _Tp, typename... _Up> |
| 2914 | inline constexpr bool __unpack_std_tuple<_Trait, _Tp, const tuple<_Up...>&> |
| 2915 | = _Trait<_Tp, const _Up&...>::value; |
| 2916 | #endif |
| 2917 | |
| 2918 | #ifdef __cpp_lib_apply // C++ >= 17 |
| 2919 | template <typename _Fn, typename _Tuple, size_t... _Idx> |
| 2920 | constexpr decltype(auto) |
| 2921 | __apply_impl(_Fn&& __f, _Tuple&& __t, index_sequence<_Idx...>) |
| 2922 | { |
| 2923 | return std::__invoke(std::forward<_Fn>(__f), |
| 2924 | std::get<_Idx>(std::forward<_Tuple>(__t))...); |
| 2925 | } |
| 2926 | |
| 2927 | #if __cpp_lib_tuple_like // >= C++23 |
| 2928 | template <typename _Fn, __tuple_like _Tuple> |
| 2929 | #else |
| 2930 | template <typename _Fn, typename _Tuple> |
| 2931 | #endif |
| 2932 | constexpr decltype(auto) |
| 2933 | apply(_Fn&& __f, _Tuple&& __t) |
| 2934 | noexcept(__unpack_std_tuple<is_nothrow_invocable, _Fn, _Tuple>) |
| 2935 | { |
| 2936 | using _Indices |
| 2937 | = make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>; |
| 2938 | return std::__apply_impl(std::forward<_Fn>(__f), |
| 2939 | std::forward<_Tuple>(__t), |
| 2940 | _Indices{}); |
| 2941 | } |
| 2942 | #endif |
| 2943 | |
| 2944 | #ifdef __cpp_lib_make_from_tuple // C++ >= 17 |
| 2945 | template <typename _Tp, typename _Tuple, size_t... _Idx> |
| 2946 | constexpr _Tp |
| 2947 | __make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>) |
| 2948 | { return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); } |
| 2949 | |
| 2950 | #if __cpp_lib_tuple_like // >= C++23 |
| 2951 | template <typename _Tp, __tuple_like _Tuple> |
| 2952 | #else |
| 2953 | template <typename _Tp, typename _Tuple> |
| 2954 | #endif |
| 2955 | constexpr _Tp |
| 2956 | make_from_tuple(_Tuple&& __t) |
| 2957 | noexcept(__unpack_std_tuple<is_nothrow_constructible, _Tp, _Tuple>) |
| 2958 | { |
| 2959 | constexpr size_t __n = tuple_size_v<remove_reference_t<_Tuple>>; |
| 2960 | #if __has_builtin(__reference_constructs_from_temporary) |
| 2961 | if constexpr (__n == 1) |
| 2962 | { |
| 2963 | using _Elt = decltype(std::get<0>(std::declval<_Tuple>())); |
| 2964 | static_assert(!__reference_constructs_from_temporary(_Tp, _Elt)); |
| 2965 | } |
| 2966 | #endif |
| 2967 | return __make_from_tuple_impl<_Tp>(std::forward<_Tuple>(__t), |
| 2968 | make_index_sequence<__n>{}); |
| 2969 | } |
| 2970 | #endif |
| 2971 | |
| 2972 | #if __cpp_lib_tuple_like // >= C++23 |
| 2973 | template<__tuple_like _TTuple, __tuple_like _UTuple, |
| 2974 | template<typename> class _TQual, template<typename> class _UQual, |
| 2975 | typename = make_index_sequence<tuple_size_v<_TTuple>>> |
| 2976 | struct __tuple_like_common_reference; |
| 2977 | |
| 2978 | template<__tuple_like _TTuple, __tuple_like _UTuple, |
| 2979 | template<typename> class _TQual, template<typename> class _UQual, |
| 2980 | size_t... _Is> |
| 2981 | requires requires |
| 2982 | { typename tuple<common_reference_t<_TQual<tuple_element_t<_Is, _TTuple>>, |
| 2983 | _UQual<tuple_element_t<_Is, _UTuple>>>...>; } |
| 2984 | struct __tuple_like_common_reference<_TTuple, _UTuple, _TQual, _UQual, index_sequence<_Is...>> |
| 2985 | { |
| 2986 | using type = tuple<common_reference_t<_TQual<tuple_element_t<_Is, _TTuple>>, |
| 2987 | _UQual<tuple_element_t<_Is, _UTuple>>>...>; |
| 2988 | }; |
| 2989 | |
| 2990 | template<__tuple_like _TTuple, __tuple_like _UTuple, |
| 2991 | template<typename> class _TQual, template<typename> class _UQual> |
| 2992 | requires (__is_tuple_v<_TTuple> || __is_tuple_v<_UTuple>) |
| 2993 | && is_same_v<_TTuple, decay_t<_TTuple>> |
| 2994 | && is_same_v<_UTuple, decay_t<_UTuple>> |
| 2995 | && (tuple_size_v<_TTuple> == tuple_size_v<_UTuple>) |
| 2996 | && requires { typename __tuple_like_common_reference<_TTuple, _UTuple, _TQual, _UQual>::type; } |
| 2997 | struct basic_common_reference<_TTuple, _UTuple, _TQual, _UQual> |
| 2998 | { |
| 2999 | using type = typename __tuple_like_common_reference<_TTuple, _UTuple, _TQual, _UQual>::type; |
| 3000 | }; |
| 3001 | |
| 3002 | template<__tuple_like _TTuple, __tuple_like _UTuple, |
| 3003 | typename = make_index_sequence<tuple_size_v<_TTuple>>> |
| 3004 | struct __tuple_like_common_type; |
| 3005 | |
| 3006 | template<__tuple_like _TTuple, __tuple_like _UTuple, size_t... _Is> |
| 3007 | requires requires |
| 3008 | { typename tuple<common_type_t<tuple_element_t<_Is, _TTuple>, |
| 3009 | tuple_element_t<_Is, _UTuple>>...>; } |
| 3010 | struct __tuple_like_common_type<_TTuple, _UTuple, index_sequence<_Is...>> |
| 3011 | { |
| 3012 | using type = tuple<common_type_t<tuple_element_t<_Is, _TTuple>, |
| 3013 | tuple_element_t<_Is, _UTuple>>...>; |
| 3014 | }; |
| 3015 | |
| 3016 | template<__tuple_like _TTuple, __tuple_like _UTuple> |
| 3017 | requires (__is_tuple_v<_TTuple> || __is_tuple_v<_UTuple>) |
| 3018 | && is_same_v<_TTuple, decay_t<_TTuple>> |
| 3019 | && is_same_v<_UTuple, decay_t<_UTuple>> |
| 3020 | && (tuple_size_v<_TTuple> == tuple_size_v<_UTuple>) |
| 3021 | && requires { typename __tuple_like_common_type<_TTuple, _UTuple>::type; } |
| 3022 | struct common_type<_TTuple, _UTuple> |
| 3023 | { |
| 3024 | using type = typename __tuple_like_common_type<_TTuple, _UTuple>::type; |
| 3025 | }; |
| 3026 | #endif // C++23 |
| 3027 | |
| 3028 | /// @} |
| 3029 | |
| 3030 | #undef __glibcxx_no_dangling_refs |
| 3031 | |
| 3032 | _GLIBCXX_END_NAMESPACE_VERSION |
| 3033 | } // namespace std |
| 3034 | |
| 3035 | #endif // C++11 |
| 3036 | |
| 3037 | #endif // _GLIBCXX_TUPLE |
| 3038 |
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