1 | // <tuple> -*- C++ -*- |
2 | |
3 | // Copyright (C) 2007-2017 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 <utility> |
39 | #include <array> |
40 | #include <bits/uses_allocator.h> |
41 | #include <bits/invoke.h> |
42 | |
43 | namespace std _GLIBCXX_VISIBILITY(default) |
44 | { |
45 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
46 | |
47 | /** |
48 | * @addtogroup utilities |
49 | * @{ |
50 | */ |
51 | |
52 | template<typename... _Elements> |
53 | class tuple; |
54 | |
55 | template<typename _Tp> |
56 | struct __is_empty_non_tuple : is_empty<_Tp> { }; |
57 | |
58 | // Using EBO for elements that are tuples causes ambiguous base errors. |
59 | template<typename _El0, typename... _El> |
60 | struct __is_empty_non_tuple<tuple<_El0, _El...>> : false_type { }; |
61 | |
62 | // Use the Empty Base-class Optimization for empty, non-final types. |
63 | template<typename _Tp> |
64 | using __empty_not_final |
65 | = typename conditional<__is_final(_Tp), false_type, |
66 | __is_empty_non_tuple<_Tp>>::type; |
67 | |
68 | template<std::size_t _Idx, typename _Head, |
69 | bool = __empty_not_final<_Head>::value> |
70 | struct _Head_base; |
71 | |
72 | template<std::size_t _Idx, typename _Head> |
73 | struct _Head_base<_Idx, _Head, true> |
74 | : public _Head |
75 | { |
76 | constexpr _Head_base() |
77 | : _Head() { } |
78 | |
79 | constexpr _Head_base(const _Head& __h) |
80 | : _Head(__h) { } |
81 | |
82 | constexpr _Head_base(const _Head_base&) = default; |
83 | constexpr _Head_base(_Head_base&&) = default; |
84 | |
85 | template<typename _UHead> |
86 | constexpr _Head_base(_UHead&& __h) |
87 | : _Head(std::forward<_UHead>(__h)) { } |
88 | |
89 | _Head_base(allocator_arg_t, __uses_alloc0) |
90 | : _Head() { } |
91 | |
92 | template<typename _Alloc> |
93 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
94 | : _Head(allocator_arg, *__a._M_a) { } |
95 | |
96 | template<typename _Alloc> |
97 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
98 | : _Head(*__a._M_a) { } |
99 | |
100 | template<typename _UHead> |
101 | _Head_base(__uses_alloc0, _UHead&& __uhead) |
102 | : _Head(std::forward<_UHead>(__uhead)) { } |
103 | |
104 | template<typename _Alloc, typename _UHead> |
105 | _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
106 | : _Head(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) { } |
107 | |
108 | template<typename _Alloc, typename _UHead> |
109 | _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
110 | : _Head(std::forward<_UHead>(__uhead), *__a._M_a) { } |
111 | |
112 | static constexpr _Head& |
113 | (_Head_base& __b) noexcept { return __b; } |
114 | |
115 | static constexpr const _Head& |
116 | (const _Head_base& __b) noexcept { return __b; } |
117 | }; |
118 | |
119 | template<std::size_t _Idx, typename _Head> |
120 | struct _Head_base<_Idx, _Head, false> |
121 | { |
122 | constexpr _Head_base() |
123 | : _M_head_impl() { } |
124 | |
125 | constexpr _Head_base(const _Head& __h) |
126 | : _M_head_impl(__h) { } |
127 | |
128 | constexpr _Head_base(const _Head_base&) = default; |
129 | constexpr _Head_base(_Head_base&&) = default; |
130 | |
131 | template<typename _UHead> |
132 | constexpr _Head_base(_UHead&& __h) |
133 | : _M_head_impl(std::forward<_UHead>(__h)) { } |
134 | |
135 | _Head_base(allocator_arg_t, __uses_alloc0) |
136 | : _M_head_impl() { } |
137 | |
138 | template<typename _Alloc> |
139 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
140 | : _M_head_impl(allocator_arg, *__a._M_a) { } |
141 | |
142 | template<typename _Alloc> |
143 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
144 | : _M_head_impl(*__a._M_a) { } |
145 | |
146 | template<typename _UHead> |
147 | _Head_base(__uses_alloc0, _UHead&& __uhead) |
148 | : _M_head_impl(std::forward<_UHead>(__uhead)) { } |
149 | |
150 | template<typename _Alloc, typename _UHead> |
151 | _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
152 | : _M_head_impl(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) |
153 | { } |
154 | |
155 | template<typename _Alloc, typename _UHead> |
156 | _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
157 | : _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { } |
158 | |
159 | static constexpr _Head& |
160 | (_Head_base& __b) noexcept { return __b._M_head_impl; } |
161 | |
162 | static constexpr const _Head& |
163 | (const _Head_base& __b) noexcept { return __b._M_head_impl; } |
164 | |
165 | _Head _M_head_impl; |
166 | }; |
167 | |
168 | /** |
169 | * Contains the actual implementation of the @c tuple template, stored |
170 | * as a recursive inheritance hierarchy from the first element (most |
171 | * derived class) to the last (least derived class). The @c Idx |
172 | * parameter gives the 0-based index of the element stored at this |
173 | * point in the hierarchy; we use it to implement a constant-time |
174 | * get() operation. |
175 | */ |
176 | template<std::size_t _Idx, typename... _Elements> |
177 | struct _Tuple_impl; |
178 | |
179 | /** |
180 | * Recursive tuple implementation. Here we store the @c Head element |
181 | * and derive from a @c Tuple_impl containing the remaining elements |
182 | * (which contains the @c Tail). |
183 | */ |
184 | template<std::size_t _Idx, typename _Head, typename... _Tail> |
185 | struct _Tuple_impl<_Idx, _Head, _Tail...> |
186 | : public _Tuple_impl<_Idx + 1, _Tail...>, |
187 | private _Head_base<_Idx, _Head> |
188 | { |
189 | template<std::size_t, typename...> friend class _Tuple_impl; |
190 | |
191 | typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited; |
192 | typedef _Head_base<_Idx, _Head> _Base; |
193 | |
194 | static constexpr _Head& |
195 | (_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
196 | |
197 | static constexpr const _Head& |
198 | (const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
199 | |
200 | static constexpr _Inherited& |
201 | _M_tail(_Tuple_impl& __t) noexcept { return __t; } |
202 | |
203 | static constexpr const _Inherited& |
204 | _M_tail(const _Tuple_impl& __t) noexcept { return __t; } |
205 | |
206 | constexpr _Tuple_impl() |
207 | : _Inherited(), _Base() { } |
208 | |
209 | explicit |
210 | constexpr _Tuple_impl(const _Head& __head, const _Tail&... __tail) |
211 | : _Inherited(__tail...), _Base(__head) { } |
212 | |
213 | template<typename _UHead, typename... _UTail, typename = typename |
214 | enable_if<sizeof...(_Tail) == sizeof...(_UTail)>::type> |
215 | explicit |
216 | constexpr _Tuple_impl(_UHead&& __head, _UTail&&... __tail) |
217 | : _Inherited(std::forward<_UTail>(__tail)...), |
218 | _Base(std::forward<_UHead>(__head)) { } |
219 | |
220 | constexpr _Tuple_impl(const _Tuple_impl&) = default; |
221 | |
222 | constexpr |
223 | _Tuple_impl(_Tuple_impl&& __in) |
224 | noexcept(__and_<is_nothrow_move_constructible<_Head>, |
225 | is_nothrow_move_constructible<_Inherited>>::value) |
226 | : _Inherited(std::move(_M_tail(__in))), |
227 | _Base(std::forward<_Head>(_M_head(__in))) { } |
228 | |
229 | template<typename... _UElements> |
230 | constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in) |
231 | : _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
232 | _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { } |
233 | |
234 | template<typename _UHead, typename... _UTails> |
235 | constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
236 | : _Inherited(std::move |
237 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
238 | _Base(std::forward<_UHead> |
239 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { } |
240 | |
241 | template<typename _Alloc> |
242 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) |
243 | : _Inherited(__tag, __a), |
244 | _Base(__tag, __use_alloc<_Head>(__a)) { } |
245 | |
246 | template<typename _Alloc> |
247 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
248 | const _Head& __head, const _Tail&... __tail) |
249 | : _Inherited(__tag, __a, __tail...), |
250 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { } |
251 | |
252 | template<typename _Alloc, typename _UHead, typename... _UTail, |
253 | typename = typename enable_if<sizeof...(_Tail) |
254 | == sizeof...(_UTail)>::type> |
255 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
256 | _UHead&& __head, _UTail&&... __tail) |
257 | : _Inherited(__tag, __a, std::forward<_UTail>(__tail)...), |
258 | _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
259 | std::forward<_UHead>(__head)) { } |
260 | |
261 | template<typename _Alloc> |
262 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
263 | const _Tuple_impl& __in) |
264 | : _Inherited(__tag, __a, _M_tail(__in)), |
265 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { } |
266 | |
267 | template<typename _Alloc> |
268 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
269 | _Tuple_impl&& __in) |
270 | : _Inherited(__tag, __a, std::move(_M_tail(__in))), |
271 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
272 | std::forward<_Head>(_M_head(__in))) { } |
273 | |
274 | template<typename _Alloc, typename... _UElements> |
275 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
276 | const _Tuple_impl<_Idx, _UElements...>& __in) |
277 | : _Inherited(__tag, __a, |
278 | _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
279 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
280 | _Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { } |
281 | |
282 | template<typename _Alloc, typename _UHead, typename... _UTails> |
283 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
284 | _Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
285 | : _Inherited(__tag, __a, std::move |
286 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
287 | _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
288 | std::forward<_UHead> |
289 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { } |
290 | |
291 | _Tuple_impl& |
292 | operator=(const _Tuple_impl& __in) |
293 | { |
294 | _M_head(*this) = _M_head(__in); |
295 | _M_tail(*this) = _M_tail(__in); |
296 | return *this; |
297 | } |
298 | |
299 | _Tuple_impl& |
300 | operator=(_Tuple_impl&& __in) |
301 | noexcept(__and_<is_nothrow_move_assignable<_Head>, |
302 | is_nothrow_move_assignable<_Inherited>>::value) |
303 | { |
304 | _M_head(*this) = std::forward<_Head>(_M_head(__in)); |
305 | _M_tail(*this) = std::move(_M_tail(__in)); |
306 | return *this; |
307 | } |
308 | |
309 | template<typename... _UElements> |
310 | _Tuple_impl& |
311 | operator=(const _Tuple_impl<_Idx, _UElements...>& __in) |
312 | { |
313 | _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in); |
314 | _M_tail(*this) = _Tuple_impl<_Idx, _UElements...>::_M_tail(__in); |
315 | return *this; |
316 | } |
317 | |
318 | template<typename _UHead, typename... _UTails> |
319 | _Tuple_impl& |
320 | operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
321 | { |
322 | _M_head(*this) = std::forward<_UHead> |
323 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)); |
324 | _M_tail(*this) = std::move |
325 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)); |
326 | return *this; |
327 | } |
328 | |
329 | protected: |
330 | void |
331 | _M_swap(_Tuple_impl& __in) |
332 | noexcept(__is_nothrow_swappable<_Head>::value |
333 | && noexcept(_M_tail(__in)._M_swap(_M_tail(__in)))) |
334 | { |
335 | using std::swap; |
336 | swap(_M_head(*this), _M_head(__in)); |
337 | _Inherited::_M_swap(_M_tail(__in)); |
338 | } |
339 | }; |
340 | |
341 | // Basis case of inheritance recursion. |
342 | template<std::size_t _Idx, typename _Head> |
343 | struct _Tuple_impl<_Idx, _Head> |
344 | : private _Head_base<_Idx, _Head> |
345 | { |
346 | template<std::size_t, typename...> friend class _Tuple_impl; |
347 | |
348 | typedef _Head_base<_Idx, _Head> _Base; |
349 | |
350 | static constexpr _Head& |
351 | (_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
352 | |
353 | static constexpr const _Head& |
354 | (const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
355 | |
356 | constexpr _Tuple_impl() |
357 | : _Base() { } |
358 | |
359 | explicit |
360 | constexpr _Tuple_impl(const _Head& __head) |
361 | : _Base(__head) { } |
362 | |
363 | template<typename _UHead> |
364 | explicit |
365 | constexpr _Tuple_impl(_UHead&& __head) |
366 | : _Base(std::forward<_UHead>(__head)) { } |
367 | |
368 | constexpr _Tuple_impl(const _Tuple_impl&) = default; |
369 | |
370 | constexpr |
371 | _Tuple_impl(_Tuple_impl&& __in) |
372 | noexcept(is_nothrow_move_constructible<_Head>::value) |
373 | : _Base(std::forward<_Head>(_M_head(__in))) { } |
374 | |
375 | template<typename _UHead> |
376 | constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UHead>& __in) |
377 | : _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in)) { } |
378 | |
379 | template<typename _UHead> |
380 | constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead>&& __in) |
381 | : _Base(std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
382 | { } |
383 | |
384 | template<typename _Alloc> |
385 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) |
386 | : _Base(__tag, __use_alloc<_Head>(__a)) { } |
387 | |
388 | template<typename _Alloc> |
389 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
390 | const _Head& __head) |
391 | : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { } |
392 | |
393 | template<typename _Alloc, typename _UHead> |
394 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
395 | _UHead&& __head) |
396 | : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
397 | std::forward<_UHead>(__head)) { } |
398 | |
399 | template<typename _Alloc> |
400 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
401 | const _Tuple_impl& __in) |
402 | : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { } |
403 | |
404 | template<typename _Alloc> |
405 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
406 | _Tuple_impl&& __in) |
407 | : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
408 | std::forward<_Head>(_M_head(__in))) { } |
409 | |
410 | template<typename _Alloc, typename _UHead> |
411 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
412 | const _Tuple_impl<_Idx, _UHead>& __in) |
413 | : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
414 | _Tuple_impl<_Idx, _UHead>::_M_head(__in)) { } |
415 | |
416 | template<typename _Alloc, typename _UHead> |
417 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
418 | _Tuple_impl<_Idx, _UHead>&& __in) |
419 | : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
420 | std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
421 | { } |
422 | |
423 | _Tuple_impl& |
424 | operator=(const _Tuple_impl& __in) |
425 | { |
426 | _M_head(*this) = _M_head(__in); |
427 | return *this; |
428 | } |
429 | |
430 | _Tuple_impl& |
431 | operator=(_Tuple_impl&& __in) |
432 | noexcept(is_nothrow_move_assignable<_Head>::value) |
433 | { |
434 | _M_head(*this) = std::forward<_Head>(_M_head(__in)); |
435 | return *this; |
436 | } |
437 | |
438 | template<typename _UHead> |
439 | _Tuple_impl& |
440 | operator=(const _Tuple_impl<_Idx, _UHead>& __in) |
441 | { |
442 | _M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in); |
443 | return *this; |
444 | } |
445 | |
446 | template<typename _UHead> |
447 | _Tuple_impl& |
448 | operator=(_Tuple_impl<_Idx, _UHead>&& __in) |
449 | { |
450 | _M_head(*this) |
451 | = std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)); |
452 | return *this; |
453 | } |
454 | |
455 | protected: |
456 | void |
457 | _M_swap(_Tuple_impl& __in) |
458 | noexcept(__is_nothrow_swappable<_Head>::value) |
459 | { |
460 | using std::swap; |
461 | swap(_M_head(*this), _M_head(__in)); |
462 | } |
463 | }; |
464 | |
465 | // Concept utility functions, reused in conditionally-explicit |
466 | // constructors. |
467 | template<bool, typename... _Elements> |
468 | struct _TC |
469 | { |
470 | template<typename... _UElements> |
471 | static constexpr bool _ConstructibleTuple() |
472 | { |
473 | return __and_<is_constructible<_Elements, const _UElements&>...>::value; |
474 | } |
475 | |
476 | template<typename... _UElements> |
477 | static constexpr bool _ImplicitlyConvertibleTuple() |
478 | { |
479 | return __and_<is_convertible<const _UElements&, _Elements>...>::value; |
480 | } |
481 | |
482 | template<typename... _UElements> |
483 | static constexpr bool _MoveConstructibleTuple() |
484 | { |
485 | return __and_<is_constructible<_Elements, _UElements&&>...>::value; |
486 | } |
487 | |
488 | template<typename... _UElements> |
489 | static constexpr bool _ImplicitlyMoveConvertibleTuple() |
490 | { |
491 | return __and_<is_convertible<_UElements&&, _Elements>...>::value; |
492 | } |
493 | |
494 | template<typename _SrcTuple> |
495 | static constexpr bool _NonNestedTuple() |
496 | { |
497 | return __and_<__not_<is_same<tuple<_Elements...>, |
498 | typename remove_cv< |
499 | typename remove_reference<_SrcTuple>::type |
500 | >::type>>, |
501 | __not_<is_convertible<_SrcTuple, _Elements...>>, |
502 | __not_<is_constructible<_Elements..., _SrcTuple>> |
503 | >::value; |
504 | } |
505 | template<typename... _UElements> |
506 | static constexpr bool _NotSameTuple() |
507 | { |
508 | return __not_<is_same<tuple<_Elements...>, |
509 | typename remove_const< |
510 | typename remove_reference<_UElements...>::type |
511 | >::type>>::value; |
512 | } |
513 | }; |
514 | |
515 | template<typename... _Elements> |
516 | struct _TC<false, _Elements...> |
517 | { |
518 | template<typename... _UElements> |
519 | static constexpr bool _ConstructibleTuple() |
520 | { |
521 | return false; |
522 | } |
523 | |
524 | template<typename... _UElements> |
525 | static constexpr bool _ImplicitlyConvertibleTuple() |
526 | { |
527 | return false; |
528 | } |
529 | |
530 | template<typename... _UElements> |
531 | static constexpr bool _MoveConstructibleTuple() |
532 | { |
533 | return false; |
534 | } |
535 | |
536 | template<typename... _UElements> |
537 | static constexpr bool _ImplicitlyMoveConvertibleTuple() |
538 | { |
539 | return false; |
540 | } |
541 | |
542 | template<typename... _UElements> |
543 | static constexpr bool _NonNestedTuple() |
544 | { |
545 | return true; |
546 | } |
547 | template<typename... _UElements> |
548 | static constexpr bool _NotSameTuple() |
549 | { |
550 | return true; |
551 | } |
552 | }; |
553 | |
554 | /// Primary class template, tuple |
555 | template<typename... _Elements> |
556 | class tuple : public _Tuple_impl<0, _Elements...> |
557 | { |
558 | typedef _Tuple_impl<0, _Elements...> _Inherited; |
559 | |
560 | // Used for constraining the default constructor so |
561 | // that it becomes dependent on the constraints. |
562 | template<typename _Dummy> |
563 | struct _TC2 |
564 | { |
565 | static constexpr bool _DefaultConstructibleTuple() |
566 | { |
567 | return __and_<is_default_constructible<_Elements>...>::value; |
568 | } |
569 | static constexpr bool _ImplicitlyDefaultConstructibleTuple() |
570 | { |
571 | return __and_<__is_implicitly_default_constructible<_Elements>...> |
572 | ::value; |
573 | } |
574 | }; |
575 | |
576 | public: |
577 | template<typename _Dummy = void, |
578 | typename enable_if<_TC2<_Dummy>:: |
579 | _ImplicitlyDefaultConstructibleTuple(), |
580 | bool>::type = true> |
581 | constexpr tuple() |
582 | : _Inherited() { } |
583 | |
584 | template<typename _Dummy = void, |
585 | typename enable_if<_TC2<_Dummy>:: |
586 | _DefaultConstructibleTuple() |
587 | && |
588 | !_TC2<_Dummy>:: |
589 | _ImplicitlyDefaultConstructibleTuple(), |
590 | bool>::type = false> |
591 | explicit constexpr tuple() |
592 | : _Inherited() { } |
593 | |
594 | // Shortcut for the cases where constructors taking _Elements... |
595 | // need to be constrained. |
596 | template<typename _Dummy> using _TCC = |
597 | _TC<is_same<_Dummy, void>::value, |
598 | _Elements...>; |
599 | |
600 | template<typename _Dummy = void, |
601 | typename enable_if< |
602 | _TCC<_Dummy>::template |
603 | _ConstructibleTuple<_Elements...>() |
604 | && _TCC<_Dummy>::template |
605 | _ImplicitlyConvertibleTuple<_Elements...>() |
606 | && (sizeof...(_Elements) >= 1), |
607 | bool>::type=true> |
608 | constexpr tuple(const _Elements&... __elements) |
609 | : _Inherited(__elements...) { } |
610 | |
611 | template<typename _Dummy = void, |
612 | typename enable_if< |
613 | _TCC<_Dummy>::template |
614 | _ConstructibleTuple<_Elements...>() |
615 | && !_TCC<_Dummy>::template |
616 | _ImplicitlyConvertibleTuple<_Elements...>() |
617 | && (sizeof...(_Elements) >= 1), |
618 | bool>::type=false> |
619 | explicit constexpr tuple(const _Elements&... __elements) |
620 | : _Inherited(__elements...) { } |
621 | |
622 | // Shortcut for the cases where constructors taking _UElements... |
623 | // need to be constrained. |
624 | template<typename... _UElements> using _TMC = |
625 | _TC<(sizeof...(_Elements) == sizeof...(_UElements)) |
626 | && (_TC<(sizeof...(_UElements)==1), _Elements...>:: |
627 | template _NotSameTuple<_UElements...>()), |
628 | _Elements...>; |
629 | |
630 | // Shortcut for the cases where constructors taking tuple<_UElements...> |
631 | // need to be constrained. |
632 | template<typename... _UElements> using _TMCT = |
633 | _TC<(sizeof...(_Elements) == sizeof...(_UElements)) |
634 | && !is_same<tuple<_Elements...>, |
635 | tuple<_UElements...>>::value, |
636 | _Elements...>; |
637 | |
638 | template<typename... _UElements, typename |
639 | enable_if< |
640 | _TMC<_UElements...>::template |
641 | _MoveConstructibleTuple<_UElements...>() |
642 | && _TMC<_UElements...>::template |
643 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
644 | && (sizeof...(_Elements) >= 1), |
645 | bool>::type=true> |
646 | constexpr tuple(_UElements&&... __elements) |
647 | : _Inherited(std::forward<_UElements>(__elements)...) { } |
648 | |
649 | template<typename... _UElements, typename |
650 | enable_if< |
651 | _TMC<_UElements...>::template |
652 | _MoveConstructibleTuple<_UElements...>() |
653 | && !_TMC<_UElements...>::template |
654 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
655 | && (sizeof...(_Elements) >= 1), |
656 | bool>::type=false> |
657 | explicit constexpr tuple(_UElements&&... __elements) |
658 | : _Inherited(std::forward<_UElements>(__elements)...) { } |
659 | |
660 | constexpr tuple(const tuple&) = default; |
661 | |
662 | constexpr tuple(tuple&&) = default; |
663 | |
664 | // Shortcut for the cases where constructors taking tuples |
665 | // must avoid creating temporaries. |
666 | template<typename _Dummy> using _TNTC = |
667 | _TC<is_same<_Dummy, void>::value && sizeof...(_Elements) == 1, |
668 | _Elements...>; |
669 | |
670 | template<typename... _UElements, typename _Dummy = void, typename |
671 | enable_if<_TMCT<_UElements...>::template |
672 | _ConstructibleTuple<_UElements...>() |
673 | && _TMCT<_UElements...>::template |
674 | _ImplicitlyConvertibleTuple<_UElements...>() |
675 | && _TNTC<_Dummy>::template |
676 | _NonNestedTuple<const tuple<_UElements...>&>(), |
677 | bool>::type=true> |
678 | constexpr tuple(const tuple<_UElements...>& __in) |
679 | : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
680 | { } |
681 | |
682 | template<typename... _UElements, typename _Dummy = void, typename |
683 | enable_if<_TMCT<_UElements...>::template |
684 | _ConstructibleTuple<_UElements...>() |
685 | && !_TMCT<_UElements...>::template |
686 | _ImplicitlyConvertibleTuple<_UElements...>() |
687 | && _TNTC<_Dummy>::template |
688 | _NonNestedTuple<const tuple<_UElements...>&>(), |
689 | bool>::type=false> |
690 | explicit constexpr tuple(const tuple<_UElements...>& __in) |
691 | : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
692 | { } |
693 | |
694 | template<typename... _UElements, typename _Dummy = void, typename |
695 | enable_if<_TMCT<_UElements...>::template |
696 | _MoveConstructibleTuple<_UElements...>() |
697 | && _TMCT<_UElements...>::template |
698 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
699 | && _TNTC<_Dummy>::template |
700 | _NonNestedTuple<tuple<_UElements...>&&>(), |
701 | bool>::type=true> |
702 | constexpr tuple(tuple<_UElements...>&& __in) |
703 | : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { } |
704 | |
705 | template<typename... _UElements, typename _Dummy = void, typename |
706 | enable_if<_TMCT<_UElements...>::template |
707 | _MoveConstructibleTuple<_UElements...>() |
708 | && !_TMCT<_UElements...>::template |
709 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
710 | && _TNTC<_Dummy>::template |
711 | _NonNestedTuple<tuple<_UElements...>&&>(), |
712 | bool>::type=false> |
713 | explicit constexpr tuple(tuple<_UElements...>&& __in) |
714 | : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { } |
715 | |
716 | // Allocator-extended constructors. |
717 | |
718 | template<typename _Alloc> |
719 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
720 | : _Inherited(__tag, __a) { } |
721 | |
722 | template<typename _Alloc, typename _Dummy = void, |
723 | typename enable_if< |
724 | _TCC<_Dummy>::template |
725 | _ConstructibleTuple<_Elements...>() |
726 | && _TCC<_Dummy>::template |
727 | _ImplicitlyConvertibleTuple<_Elements...>(), |
728 | bool>::type=true> |
729 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
730 | const _Elements&... __elements) |
731 | : _Inherited(__tag, __a, __elements...) { } |
732 | |
733 | template<typename _Alloc, typename _Dummy = void, |
734 | typename enable_if< |
735 | _TCC<_Dummy>::template |
736 | _ConstructibleTuple<_Elements...>() |
737 | && !_TCC<_Dummy>::template |
738 | _ImplicitlyConvertibleTuple<_Elements...>(), |
739 | bool>::type=false> |
740 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
741 | const _Elements&... __elements) |
742 | : _Inherited(__tag, __a, __elements...) { } |
743 | |
744 | template<typename _Alloc, typename... _UElements, typename |
745 | enable_if<_TMC<_UElements...>::template |
746 | _MoveConstructibleTuple<_UElements...>() |
747 | && _TMC<_UElements...>::template |
748 | _ImplicitlyMoveConvertibleTuple<_UElements...>(), |
749 | bool>::type=true> |
750 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
751 | _UElements&&... __elements) |
752 | : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...) |
753 | { } |
754 | |
755 | template<typename _Alloc, typename... _UElements, typename |
756 | enable_if<_TMC<_UElements...>::template |
757 | _MoveConstructibleTuple<_UElements...>() |
758 | && !_TMC<_UElements...>::template |
759 | _ImplicitlyMoveConvertibleTuple<_UElements...>(), |
760 | bool>::type=false> |
761 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
762 | _UElements&&... __elements) |
763 | : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...) |
764 | { } |
765 | |
766 | template<typename _Alloc> |
767 | tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in) |
768 | : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { } |
769 | |
770 | template<typename _Alloc> |
771 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in) |
772 | : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { } |
773 | |
774 | template<typename _Alloc, typename _Dummy = void, |
775 | typename... _UElements, typename |
776 | enable_if<_TMCT<_UElements...>::template |
777 | _ConstructibleTuple<_UElements...>() |
778 | && _TMCT<_UElements...>::template |
779 | _ImplicitlyConvertibleTuple<_UElements...>() |
780 | && _TNTC<_Dummy>::template |
781 | _NonNestedTuple<tuple<_UElements...>&&>(), |
782 | bool>::type=true> |
783 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
784 | const tuple<_UElements...>& __in) |
785 | : _Inherited(__tag, __a, |
786 | static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
787 | { } |
788 | |
789 | template<typename _Alloc, typename _Dummy = void, |
790 | typename... _UElements, typename |
791 | enable_if<_TMCT<_UElements...>::template |
792 | _ConstructibleTuple<_UElements...>() |
793 | && !_TMCT<_UElements...>::template |
794 | _ImplicitlyConvertibleTuple<_UElements...>() |
795 | && _TNTC<_Dummy>::template |
796 | _NonNestedTuple<tuple<_UElements...>&&>(), |
797 | bool>::type=false> |
798 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
799 | const tuple<_UElements...>& __in) |
800 | : _Inherited(__tag, __a, |
801 | static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
802 | { } |
803 | |
804 | template<typename _Alloc, typename _Dummy = void, |
805 | typename... _UElements, typename |
806 | enable_if<_TMCT<_UElements...>::template |
807 | _MoveConstructibleTuple<_UElements...>() |
808 | && _TMCT<_UElements...>::template |
809 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
810 | && _TNTC<_Dummy>::template |
811 | _NonNestedTuple<tuple<_UElements...>&&>(), |
812 | bool>::type=true> |
813 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
814 | tuple<_UElements...>&& __in) |
815 | : _Inherited(__tag, __a, |
816 | static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
817 | { } |
818 | |
819 | template<typename _Alloc, typename _Dummy = void, |
820 | typename... _UElements, typename |
821 | enable_if<_TMCT<_UElements...>::template |
822 | _MoveConstructibleTuple<_UElements...>() |
823 | && !_TMCT<_UElements...>::template |
824 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
825 | && _TNTC<_Dummy>::template |
826 | _NonNestedTuple<tuple<_UElements...>&&>(), |
827 | bool>::type=false> |
828 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
829 | tuple<_UElements...>&& __in) |
830 | : _Inherited(__tag, __a, |
831 | static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
832 | { } |
833 | |
834 | tuple& |
835 | operator=(const tuple& __in) |
836 | { |
837 | static_cast<_Inherited&>(*this) = __in; |
838 | return *this; |
839 | } |
840 | |
841 | tuple& |
842 | operator=(tuple&& __in) |
843 | noexcept(is_nothrow_move_assignable<_Inherited>::value) |
844 | { |
845 | static_cast<_Inherited&>(*this) = std::move(__in); |
846 | return *this; |
847 | } |
848 | |
849 | template<typename... _UElements> |
850 | typename |
851 | enable_if<sizeof...(_UElements) |
852 | == sizeof...(_Elements), tuple&>::type |
853 | operator=(const tuple<_UElements...>& __in) |
854 | { |
855 | static_cast<_Inherited&>(*this) = __in; |
856 | return *this; |
857 | } |
858 | |
859 | template<typename... _UElements> |
860 | typename |
861 | enable_if<sizeof...(_UElements) |
862 | == sizeof...(_Elements), tuple&>::type |
863 | operator=(tuple<_UElements...>&& __in) |
864 | { |
865 | static_cast<_Inherited&>(*this) = std::move(__in); |
866 | return *this; |
867 | } |
868 | |
869 | void |
870 | swap(tuple& __in) |
871 | noexcept(noexcept(__in._M_swap(__in))) |
872 | { _Inherited::_M_swap(__in); } |
873 | }; |
874 | |
875 | #if __cpp_deduction_guides >= 201606 |
876 | template<typename... _UTypes> |
877 | tuple(_UTypes...) -> tuple<_UTypes...>; |
878 | template<typename _T1, typename _T2> |
879 | tuple(pair<_T1, _T2>) -> tuple<_T1, _T2>; |
880 | template<typename _Alloc, typename... _UTypes> |
881 | tuple(allocator_arg_t, _Alloc, _UTypes...) -> tuple<_UTypes...>; |
882 | template<typename _Alloc, typename _T1, typename _T2> |
883 | tuple(allocator_arg_t, _Alloc, pair<_T1, _T2>) -> tuple<_T1, _T2>; |
884 | template<typename _Alloc, typename... _UTypes> |
885 | tuple(allocator_arg_t, _Alloc, tuple<_UTypes...>) -> tuple<_UTypes...>; |
886 | #endif |
887 | |
888 | // Explicit specialization, zero-element tuple. |
889 | template<> |
890 | class tuple<> |
891 | { |
892 | public: |
893 | void swap(tuple&) noexcept { /* no-op */ } |
894 | // We need the default since we're going to define no-op |
895 | // allocator constructors. |
896 | tuple() = default; |
897 | // No-op allocator constructors. |
898 | template<typename _Alloc> |
899 | tuple(allocator_arg_t, const _Alloc&) { } |
900 | template<typename _Alloc> |
901 | tuple(allocator_arg_t, const _Alloc&, const tuple&) { } |
902 | }; |
903 | |
904 | /// Partial specialization, 2-element tuple. |
905 | /// Includes construction and assignment from a pair. |
906 | template<typename _T1, typename _T2> |
907 | class tuple<_T1, _T2> : public _Tuple_impl<0, _T1, _T2> |
908 | { |
909 | typedef _Tuple_impl<0, _T1, _T2> _Inherited; |
910 | |
911 | public: |
912 | template <typename _U1 = _T1, |
913 | typename _U2 = _T2, |
914 | typename enable_if<__and_< |
915 | __is_implicitly_default_constructible<_U1>, |
916 | __is_implicitly_default_constructible<_U2>> |
917 | ::value, bool>::type = true> |
918 | |
919 | constexpr tuple() |
920 | : _Inherited() { } |
921 | |
922 | template <typename _U1 = _T1, |
923 | typename _U2 = _T2, |
924 | typename enable_if< |
925 | __and_< |
926 | is_default_constructible<_U1>, |
927 | is_default_constructible<_U2>, |
928 | __not_< |
929 | __and_<__is_implicitly_default_constructible<_U1>, |
930 | __is_implicitly_default_constructible<_U2>>>> |
931 | ::value, bool>::type = false> |
932 | |
933 | explicit constexpr tuple() |
934 | : _Inherited() { } |
935 | |
936 | // Shortcut for the cases where constructors taking _T1, _T2 |
937 | // need to be constrained. |
938 | template<typename _Dummy> using _TCC = |
939 | _TC<is_same<_Dummy, void>::value, _T1, _T2>; |
940 | |
941 | template<typename _Dummy = void, typename |
942 | enable_if<_TCC<_Dummy>::template |
943 | _ConstructibleTuple<_T1, _T2>() |
944 | && _TCC<_Dummy>::template |
945 | _ImplicitlyConvertibleTuple<_T1, _T2>(), |
946 | bool>::type = true> |
947 | constexpr tuple(const _T1& __a1, const _T2& __a2) |
948 | : _Inherited(__a1, __a2) { } |
949 | |
950 | template<typename _Dummy = void, typename |
951 | enable_if<_TCC<_Dummy>::template |
952 | _ConstructibleTuple<_T1, _T2>() |
953 | && !_TCC<_Dummy>::template |
954 | _ImplicitlyConvertibleTuple<_T1, _T2>(), |
955 | bool>::type = false> |
956 | explicit constexpr tuple(const _T1& __a1, const _T2& __a2) |
957 | : _Inherited(__a1, __a2) { } |
958 | |
959 | // Shortcut for the cases where constructors taking _U1, _U2 |
960 | // need to be constrained. |
961 | using _TMC = _TC<true, _T1, _T2>; |
962 | |
963 | template<typename _U1, typename _U2, typename |
964 | enable_if<_TMC::template |
965 | _MoveConstructibleTuple<_U1, _U2>() |
966 | && _TMC::template |
967 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>() |
968 | && !is_same<typename decay<_U1>::type, |
969 | allocator_arg_t>::value, |
970 | bool>::type = true> |
971 | constexpr tuple(_U1&& __a1, _U2&& __a2) |
972 | : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { } |
973 | |
974 | template<typename _U1, typename _U2, typename |
975 | enable_if<_TMC::template |
976 | _MoveConstructibleTuple<_U1, _U2>() |
977 | && !_TMC::template |
978 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>() |
979 | && !is_same<typename decay<_U1>::type, |
980 | allocator_arg_t>::value, |
981 | bool>::type = false> |
982 | explicit constexpr tuple(_U1&& __a1, _U2&& __a2) |
983 | : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { } |
984 | |
985 | constexpr tuple(const tuple&) = default; |
986 | |
987 | constexpr tuple(tuple&&) = default; |
988 | |
989 | template<typename _U1, typename _U2, typename |
990 | enable_if<_TMC::template |
991 | _ConstructibleTuple<_U1, _U2>() |
992 | && _TMC::template |
993 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
994 | bool>::type = true> |
995 | constexpr tuple(const tuple<_U1, _U2>& __in) |
996 | : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { } |
997 | |
998 | template<typename _U1, typename _U2, typename |
999 | enable_if<_TMC::template |
1000 | _ConstructibleTuple<_U1, _U2>() |
1001 | && !_TMC::template |
1002 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1003 | bool>::type = false> |
1004 | explicit constexpr tuple(const tuple<_U1, _U2>& __in) |
1005 | : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { } |
1006 | |
1007 | template<typename _U1, typename _U2, typename |
1008 | enable_if<_TMC::template |
1009 | _MoveConstructibleTuple<_U1, _U2>() |
1010 | && _TMC::template |
1011 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1012 | bool>::type = true> |
1013 | constexpr tuple(tuple<_U1, _U2>&& __in) |
1014 | : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { } |
1015 | |
1016 | template<typename _U1, typename _U2, typename |
1017 | enable_if<_TMC::template |
1018 | _MoveConstructibleTuple<_U1, _U2>() |
1019 | && !_TMC::template |
1020 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1021 | bool>::type = false> |
1022 | explicit constexpr tuple(tuple<_U1, _U2>&& __in) |
1023 | : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { } |
1024 | |
1025 | template<typename _U1, typename _U2, typename |
1026 | enable_if<_TMC::template |
1027 | _ConstructibleTuple<_U1, _U2>() |
1028 | && _TMC::template |
1029 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1030 | bool>::type = true> |
1031 | constexpr tuple(const pair<_U1, _U2>& __in) |
1032 | : _Inherited(__in.first, __in.second) { } |
1033 | |
1034 | template<typename _U1, typename _U2, typename |
1035 | enable_if<_TMC::template |
1036 | _ConstructibleTuple<_U1, _U2>() |
1037 | && !_TMC::template |
1038 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1039 | bool>::type = false> |
1040 | explicit constexpr tuple(const pair<_U1, _U2>& __in) |
1041 | : _Inherited(__in.first, __in.second) { } |
1042 | |
1043 | template<typename _U1, typename _U2, typename |
1044 | enable_if<_TMC::template |
1045 | _MoveConstructibleTuple<_U1, _U2>() |
1046 | && _TMC::template |
1047 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1048 | bool>::type = true> |
1049 | constexpr tuple(pair<_U1, _U2>&& __in) |
1050 | : _Inherited(std::forward<_U1>(__in.first), |
1051 | std::forward<_U2>(__in.second)) { } |
1052 | |
1053 | template<typename _U1, typename _U2, typename |
1054 | enable_if<_TMC::template |
1055 | _MoveConstructibleTuple<_U1, _U2>() |
1056 | && !_TMC::template |
1057 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1058 | bool>::type = false> |
1059 | explicit constexpr tuple(pair<_U1, _U2>&& __in) |
1060 | : _Inherited(std::forward<_U1>(__in.first), |
1061 | std::forward<_U2>(__in.second)) { } |
1062 | |
1063 | // Allocator-extended constructors. |
1064 | |
1065 | template<typename _Alloc> |
1066 | tuple(allocator_arg_t __tag, const _Alloc& __a) |
1067 | : _Inherited(__tag, __a) { } |
1068 | |
1069 | template<typename _Alloc, typename _Dummy = void, |
1070 | typename enable_if< |
1071 | _TCC<_Dummy>::template |
1072 | _ConstructibleTuple<_T1, _T2>() |
1073 | && _TCC<_Dummy>::template |
1074 | _ImplicitlyConvertibleTuple<_T1, _T2>(), |
1075 | bool>::type=true> |
1076 | |
1077 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
1078 | const _T1& __a1, const _T2& __a2) |
1079 | : _Inherited(__tag, __a, __a1, __a2) { } |
1080 | |
1081 | template<typename _Alloc, typename _Dummy = void, |
1082 | typename enable_if< |
1083 | _TCC<_Dummy>::template |
1084 | _ConstructibleTuple<_T1, _T2>() |
1085 | && !_TCC<_Dummy>::template |
1086 | _ImplicitlyConvertibleTuple<_T1, _T2>(), |
1087 | bool>::type=false> |
1088 | |
1089 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
1090 | const _T1& __a1, const _T2& __a2) |
1091 | : _Inherited(__tag, __a, __a1, __a2) { } |
1092 | |
1093 | template<typename _Alloc, typename _U1, typename _U2, typename |
1094 | enable_if<_TMC::template |
1095 | _MoveConstructibleTuple<_U1, _U2>() |
1096 | && _TMC::template |
1097 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1098 | bool>::type = true> |
1099 | tuple(allocator_arg_t __tag, const _Alloc& __a, _U1&& __a1, _U2&& __a2) |
1100 | : _Inherited(__tag, __a, std::forward<_U1>(__a1), |
1101 | std::forward<_U2>(__a2)) { } |
1102 | |
1103 | template<typename _Alloc, typename _U1, typename _U2, typename |
1104 | enable_if<_TMC::template |
1105 | _MoveConstructibleTuple<_U1, _U2>() |
1106 | && !_TMC::template |
1107 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1108 | bool>::type = false> |
1109 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
1110 | _U1&& __a1, _U2&& __a2) |
1111 | : _Inherited(__tag, __a, std::forward<_U1>(__a1), |
1112 | std::forward<_U2>(__a2)) { } |
1113 | |
1114 | template<typename _Alloc> |
1115 | tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in) |
1116 | : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { } |
1117 | |
1118 | template<typename _Alloc> |
1119 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in) |
1120 | : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { } |
1121 | |
1122 | template<typename _Alloc, typename _U1, typename _U2, typename |
1123 | enable_if<_TMC::template |
1124 | _ConstructibleTuple<_U1, _U2>() |
1125 | && _TMC::template |
1126 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1127 | bool>::type = true> |
1128 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
1129 | const tuple<_U1, _U2>& __in) |
1130 | : _Inherited(__tag, __a, |
1131 | static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
1132 | { } |
1133 | |
1134 | template<typename _Alloc, typename _U1, typename _U2, typename |
1135 | enable_if<_TMC::template |
1136 | _ConstructibleTuple<_U1, _U2>() |
1137 | && !_TMC::template |
1138 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1139 | bool>::type = false> |
1140 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
1141 | const tuple<_U1, _U2>& __in) |
1142 | : _Inherited(__tag, __a, |
1143 | static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
1144 | { } |
1145 | |
1146 | template<typename _Alloc, typename _U1, typename _U2, typename |
1147 | enable_if<_TMC::template |
1148 | _MoveConstructibleTuple<_U1, _U2>() |
1149 | && _TMC::template |
1150 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1151 | bool>::type = true> |
1152 | tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1, _U2>&& __in) |
1153 | : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
1154 | { } |
1155 | |
1156 | template<typename _Alloc, typename _U1, typename _U2, typename |
1157 | enable_if<_TMC::template |
1158 | _MoveConstructibleTuple<_U1, _U2>() |
1159 | && !_TMC::template |
1160 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1161 | bool>::type = false> |
1162 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
1163 | tuple<_U1, _U2>&& __in) |
1164 | : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
1165 | { } |
1166 | |
1167 | template<typename _Alloc, typename _U1, typename _U2, typename |
1168 | enable_if<_TMC::template |
1169 | _ConstructibleTuple<_U1, _U2>() |
1170 | && _TMC::template |
1171 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1172 | bool>::type = true> |
1173 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
1174 | const pair<_U1, _U2>& __in) |
1175 | : _Inherited(__tag, __a, __in.first, __in.second) { } |
1176 | |
1177 | template<typename _Alloc, typename _U1, typename _U2, typename |
1178 | enable_if<_TMC::template |
1179 | _ConstructibleTuple<_U1, _U2>() |
1180 | && !_TMC::template |
1181 | _ImplicitlyConvertibleTuple<_U1, _U2>(), |
1182 | bool>::type = false> |
1183 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
1184 | const pair<_U1, _U2>& __in) |
1185 | : _Inherited(__tag, __a, __in.first, __in.second) { } |
1186 | |
1187 | template<typename _Alloc, typename _U1, typename _U2, typename |
1188 | enable_if<_TMC::template |
1189 | _MoveConstructibleTuple<_U1, _U2>() |
1190 | && _TMC::template |
1191 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1192 | bool>::type = true> |
1193 | tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in) |
1194 | : _Inherited(__tag, __a, std::forward<_U1>(__in.first), |
1195 | std::forward<_U2>(__in.second)) { } |
1196 | |
1197 | template<typename _Alloc, typename _U1, typename _U2, typename |
1198 | enable_if<_TMC::template |
1199 | _MoveConstructibleTuple<_U1, _U2>() |
1200 | && !_TMC::template |
1201 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>(), |
1202 | bool>::type = false> |
1203 | explicit tuple(allocator_arg_t __tag, const _Alloc& __a, |
1204 | pair<_U1, _U2>&& __in) |
1205 | : _Inherited(__tag, __a, std::forward<_U1>(__in.first), |
1206 | std::forward<_U2>(__in.second)) { } |
1207 | |
1208 | tuple& |
1209 | operator=(const tuple& __in) |
1210 | { |
1211 | static_cast<_Inherited&>(*this) = __in; |
1212 | return *this; |
1213 | } |
1214 | |
1215 | tuple& |
1216 | operator=(tuple&& __in) |
1217 | noexcept(is_nothrow_move_assignable<_Inherited>::value) |
1218 | { |
1219 | static_cast<_Inherited&>(*this) = std::move(__in); |
1220 | return *this; |
1221 | } |
1222 | |
1223 | template<typename _U1, typename _U2> |
1224 | tuple& |
1225 | operator=(const tuple<_U1, _U2>& __in) |
1226 | { |
1227 | static_cast<_Inherited&>(*this) = __in; |
1228 | return *this; |
1229 | } |
1230 | |
1231 | template<typename _U1, typename _U2> |
1232 | tuple& |
1233 | operator=(tuple<_U1, _U2>&& __in) |
1234 | { |
1235 | static_cast<_Inherited&>(*this) = std::move(__in); |
1236 | return *this; |
1237 | } |
1238 | |
1239 | template<typename _U1, typename _U2> |
1240 | tuple& |
1241 | operator=(const pair<_U1, _U2>& __in) |
1242 | { |
1243 | this->_M_head(*this) = __in.first; |
1244 | this->_M_tail(*this)._M_head(*this) = __in.second; |
1245 | return *this; |
1246 | } |
1247 | |
1248 | template<typename _U1, typename _U2> |
1249 | tuple& |
1250 | operator=(pair<_U1, _U2>&& __in) |
1251 | { |
1252 | this->_M_head(*this) = std::forward<_U1>(__in.first); |
1253 | this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__in.second); |
1254 | return *this; |
1255 | } |
1256 | |
1257 | void |
1258 | swap(tuple& __in) |
1259 | noexcept(noexcept(__in._M_swap(__in))) |
1260 | { _Inherited::_M_swap(__in); } |
1261 | }; |
1262 | |
1263 | |
1264 | /// class tuple_size |
1265 | template<typename... _Elements> |
1266 | struct tuple_size<tuple<_Elements...>> |
1267 | : public integral_constant<std::size_t, sizeof...(_Elements)> { }; |
1268 | |
1269 | #if __cplusplus > 201402L |
1270 | template <typename _Tp> |
1271 | inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; |
1272 | #endif |
1273 | |
1274 | /** |
1275 | * Recursive case for tuple_element: strip off the first element in |
1276 | * the tuple and retrieve the (i-1)th element of the remaining tuple. |
1277 | */ |
1278 | template<std::size_t __i, typename _Head, typename... _Tail> |
1279 | struct tuple_element<__i, tuple<_Head, _Tail...> > |
1280 | : tuple_element<__i - 1, tuple<_Tail...> > { }; |
1281 | |
1282 | /** |
1283 | * Basis case for tuple_element: The first element is the one we're seeking. |
1284 | */ |
1285 | template<typename _Head, typename... _Tail> |
1286 | struct tuple_element<0, tuple<_Head, _Tail...> > |
1287 | { |
1288 | typedef _Head type; |
1289 | }; |
1290 | |
1291 | /** |
1292 | * Error case for tuple_element: invalid index. |
1293 | */ |
1294 | template<size_t __i> |
1295 | struct tuple_element<__i, tuple<>> |
1296 | { |
1297 | static_assert(__i < tuple_size<tuple<>>::value, |
1298 | "tuple index is in range" ); |
1299 | }; |
1300 | |
1301 | template<std::size_t __i, typename _Head, typename... _Tail> |
1302 | constexpr _Head& |
1303 | __get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
1304 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
1305 | |
1306 | template<std::size_t __i, typename _Head, typename... _Tail> |
1307 | constexpr const _Head& |
1308 | __get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
1309 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
1310 | |
1311 | /// Return a reference to the ith element of a tuple. |
1312 | template<std::size_t __i, typename... _Elements> |
1313 | constexpr __tuple_element_t<__i, tuple<_Elements...>>& |
1314 | get(tuple<_Elements...>& __t) noexcept |
1315 | { return std::__get_helper<__i>(__t); } |
1316 | |
1317 | /// Return a const reference to the ith element of a const tuple. |
1318 | template<std::size_t __i, typename... _Elements> |
1319 | constexpr const __tuple_element_t<__i, tuple<_Elements...>>& |
1320 | get(const tuple<_Elements...>& __t) noexcept |
1321 | { return std::__get_helper<__i>(__t); } |
1322 | |
1323 | /// Return an rvalue reference to the ith element of a tuple rvalue. |
1324 | template<std::size_t __i, typename... _Elements> |
1325 | constexpr __tuple_element_t<__i, tuple<_Elements...>>&& |
1326 | get(tuple<_Elements...>&& __t) noexcept |
1327 | { |
1328 | typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type; |
1329 | return std::forward<__element_type&&>(std::get<__i>(__t)); |
1330 | } |
1331 | |
1332 | #if __cplusplus > 201103L |
1333 | |
1334 | #define __cpp_lib_tuples_by_type 201304 |
1335 | |
1336 | template<typename _Head, size_t __i, typename... _Tail> |
1337 | constexpr _Head& |
1338 | __get_helper2(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
1339 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
1340 | |
1341 | template<typename _Head, size_t __i, typename... _Tail> |
1342 | constexpr const _Head& |
1343 | __get_helper2(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
1344 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
1345 | |
1346 | /// Return a reference to the unique element of type _Tp of a tuple. |
1347 | template <typename _Tp, typename... _Types> |
1348 | constexpr _Tp& |
1349 | get(tuple<_Types...>& __t) noexcept |
1350 | { return std::__get_helper2<_Tp>(__t); } |
1351 | |
1352 | /// Return a reference to the unique element of type _Tp of a tuple rvalue. |
1353 | template <typename _Tp, typename... _Types> |
1354 | constexpr _Tp&& |
1355 | get(tuple<_Types...>&& __t) noexcept |
1356 | { return std::forward<_Tp&&>(std::__get_helper2<_Tp>(__t)); } |
1357 | |
1358 | /// Return a const reference to the unique element of type _Tp of a tuple. |
1359 | template <typename _Tp, typename... _Types> |
1360 | constexpr const _Tp& |
1361 | get(const tuple<_Types...>& __t) noexcept |
1362 | { return std::__get_helper2<_Tp>(__t); } |
1363 | #endif |
1364 | |
1365 | // This class performs the comparison operations on tuples |
1366 | template<typename _Tp, typename _Up, size_t __i, size_t __size> |
1367 | struct __tuple_compare |
1368 | { |
1369 | static constexpr bool |
1370 | __eq(const _Tp& __t, const _Up& __u) |
1371 | { |
1372 | return bool(std::get<__i>(__t) == std::get<__i>(__u)) |
1373 | && __tuple_compare<_Tp, _Up, __i + 1, __size>::__eq(__t, __u); |
1374 | } |
1375 | |
1376 | static constexpr bool |
1377 | __less(const _Tp& __t, const _Up& __u) |
1378 | { |
1379 | return bool(std::get<__i>(__t) < std::get<__i>(__u)) |
1380 | || (!bool(std::get<__i>(__u) < std::get<__i>(__t)) |
1381 | && __tuple_compare<_Tp, _Up, __i + 1, __size>::__less(__t, __u)); |
1382 | } |
1383 | }; |
1384 | |
1385 | template<typename _Tp, typename _Up, size_t __size> |
1386 | struct __tuple_compare<_Tp, _Up, __size, __size> |
1387 | { |
1388 | static constexpr bool |
1389 | __eq(const _Tp&, const _Up&) { return true; } |
1390 | |
1391 | static constexpr bool |
1392 | __less(const _Tp&, const _Up&) { return false; } |
1393 | }; |
1394 | |
1395 | template<typename... _TElements, typename... _UElements> |
1396 | constexpr bool |
1397 | operator==(const tuple<_TElements...>& __t, |
1398 | const tuple<_UElements...>& __u) |
1399 | { |
1400 | static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
1401 | "tuple objects can only be compared if they have equal sizes." ); |
1402 | using __compare = __tuple_compare<tuple<_TElements...>, |
1403 | tuple<_UElements...>, |
1404 | 0, sizeof...(_TElements)>; |
1405 | return __compare::__eq(__t, __u); |
1406 | } |
1407 | |
1408 | template<typename... _TElements, typename... _UElements> |
1409 | constexpr bool |
1410 | operator<(const tuple<_TElements...>& __t, |
1411 | const tuple<_UElements...>& __u) |
1412 | { |
1413 | static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
1414 | "tuple objects can only be compared if they have equal sizes." ); |
1415 | using __compare = __tuple_compare<tuple<_TElements...>, |
1416 | tuple<_UElements...>, |
1417 | 0, sizeof...(_TElements)>; |
1418 | return __compare::__less(__t, __u); |
1419 | } |
1420 | |
1421 | template<typename... _TElements, typename... _UElements> |
1422 | constexpr bool |
1423 | operator!=(const tuple<_TElements...>& __t, |
1424 | const tuple<_UElements...>& __u) |
1425 | { return !(__t == __u); } |
1426 | |
1427 | template<typename... _TElements, typename... _UElements> |
1428 | constexpr bool |
1429 | operator>(const tuple<_TElements...>& __t, |
1430 | const tuple<_UElements...>& __u) |
1431 | { return __u < __t; } |
1432 | |
1433 | template<typename... _TElements, typename... _UElements> |
1434 | constexpr bool |
1435 | operator<=(const tuple<_TElements...>& __t, |
1436 | const tuple<_UElements...>& __u) |
1437 | { return !(__u < __t); } |
1438 | |
1439 | template<typename... _TElements, typename... _UElements> |
1440 | constexpr bool |
1441 | operator>=(const tuple<_TElements...>& __t, |
1442 | const tuple<_UElements...>& __u) |
1443 | { return !(__t < __u); } |
1444 | |
1445 | // NB: DR 705. |
1446 | template<typename... _Elements> |
1447 | constexpr tuple<typename __decay_and_strip<_Elements>::__type...> |
1448 | make_tuple(_Elements&&... __args) |
1449 | { |
1450 | typedef tuple<typename __decay_and_strip<_Elements>::__type...> |
1451 | __result_type; |
1452 | return __result_type(std::forward<_Elements>(__args)...); |
1453 | } |
1454 | |
1455 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1456 | // 2275. Why is forward_as_tuple not constexpr? |
1457 | template<typename... _Elements> |
1458 | constexpr tuple<_Elements&&...> |
1459 | forward_as_tuple(_Elements&&... __args) noexcept |
1460 | { return tuple<_Elements&&...>(std::forward<_Elements>(__args)...); } |
1461 | |
1462 | template<size_t, typename, typename, size_t> |
1463 | struct __make_tuple_impl; |
1464 | |
1465 | template<size_t _Idx, typename _Tuple, typename... _Tp, size_t _Nm> |
1466 | struct __make_tuple_impl<_Idx, tuple<_Tp...>, _Tuple, _Nm> |
1467 | : __make_tuple_impl<_Idx + 1, |
1468 | tuple<_Tp..., __tuple_element_t<_Idx, _Tuple>>, |
1469 | _Tuple, _Nm> |
1470 | { }; |
1471 | |
1472 | template<std::size_t _Nm, typename _Tuple, typename... _Tp> |
1473 | struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm> |
1474 | { |
1475 | typedef tuple<_Tp...> __type; |
1476 | }; |
1477 | |
1478 | template<typename _Tuple> |
1479 | struct __do_make_tuple |
1480 | : __make_tuple_impl<0, tuple<>, _Tuple, std::tuple_size<_Tuple>::value> |
1481 | { }; |
1482 | |
1483 | // Returns the std::tuple equivalent of a tuple-like type. |
1484 | template<typename _Tuple> |
1485 | struct __make_tuple |
1486 | : public __do_make_tuple<typename std::remove_cv |
1487 | <typename std::remove_reference<_Tuple>::type>::type> |
1488 | { }; |
1489 | |
1490 | // Combines several std::tuple's into a single one. |
1491 | template<typename...> |
1492 | struct __combine_tuples; |
1493 | |
1494 | template<> |
1495 | struct __combine_tuples<> |
1496 | { |
1497 | typedef tuple<> __type; |
1498 | }; |
1499 | |
1500 | template<typename... _Ts> |
1501 | struct __combine_tuples<tuple<_Ts...>> |
1502 | { |
1503 | typedef tuple<_Ts...> __type; |
1504 | }; |
1505 | |
1506 | template<typename... _T1s, typename... _T2s, typename... _Rem> |
1507 | struct __combine_tuples<tuple<_T1s...>, tuple<_T2s...>, _Rem...> |
1508 | { |
1509 | typedef typename __combine_tuples<tuple<_T1s..., _T2s...>, |
1510 | _Rem...>::__type __type; |
1511 | }; |
1512 | |
1513 | // Computes the result type of tuple_cat given a set of tuple-like types. |
1514 | template<typename... _Tpls> |
1515 | struct __tuple_cat_result |
1516 | { |
1517 | typedef typename __combine_tuples |
1518 | <typename __make_tuple<_Tpls>::__type...>::__type __type; |
1519 | }; |
1520 | |
1521 | // Helper to determine the index set for the first tuple-like |
1522 | // type of a given set. |
1523 | template<typename...> |
1524 | struct __make_1st_indices; |
1525 | |
1526 | template<> |
1527 | struct __make_1st_indices<> |
1528 | { |
1529 | typedef std::_Index_tuple<> __type; |
1530 | }; |
1531 | |
1532 | template<typename _Tp, typename... _Tpls> |
1533 | struct __make_1st_indices<_Tp, _Tpls...> |
1534 | { |
1535 | typedef typename std::_Build_index_tuple<std::tuple_size< |
1536 | typename std::remove_reference<_Tp>::type>::value>::__type __type; |
1537 | }; |
1538 | |
1539 | // Performs the actual concatenation by step-wise expanding tuple-like |
1540 | // objects into the elements, which are finally forwarded into the |
1541 | // result tuple. |
1542 | template<typename _Ret, typename _Indices, typename... _Tpls> |
1543 | struct __tuple_concater; |
1544 | |
1545 | template<typename _Ret, std::size_t... _Is, typename _Tp, typename... _Tpls> |
1546 | struct __tuple_concater<_Ret, std::_Index_tuple<_Is...>, _Tp, _Tpls...> |
1547 | { |
1548 | template<typename... _Us> |
1549 | static constexpr _Ret |
1550 | _S_do(_Tp&& __tp, _Tpls&&... __tps, _Us&&... __us) |
1551 | { |
1552 | typedef typename __make_1st_indices<_Tpls...>::__type __idx; |
1553 | typedef __tuple_concater<_Ret, __idx, _Tpls...> __next; |
1554 | return __next::_S_do(std::forward<_Tpls>(__tps)..., |
1555 | std::forward<_Us>(__us)..., |
1556 | std::get<_Is>(std::forward<_Tp>(__tp))...); |
1557 | } |
1558 | }; |
1559 | |
1560 | template<typename _Ret> |
1561 | struct __tuple_concater<_Ret, std::_Index_tuple<>> |
1562 | { |
1563 | template<typename... _Us> |
1564 | static constexpr _Ret |
1565 | _S_do(_Us&&... __us) |
1566 | { |
1567 | return _Ret(std::forward<_Us>(__us)...); |
1568 | } |
1569 | }; |
1570 | |
1571 | /// tuple_cat |
1572 | template<typename... _Tpls, typename = typename |
1573 | enable_if<__and_<__is_tuple_like<_Tpls>...>::value>::type> |
1574 | constexpr auto |
1575 | tuple_cat(_Tpls&&... __tpls) |
1576 | -> typename __tuple_cat_result<_Tpls...>::__type |
1577 | { |
1578 | typedef typename __tuple_cat_result<_Tpls...>::__type __ret; |
1579 | typedef typename __make_1st_indices<_Tpls...>::__type __idx; |
1580 | typedef __tuple_concater<__ret, __idx, _Tpls...> __concater; |
1581 | return __concater::_S_do(std::forward<_Tpls>(__tpls)...); |
1582 | } |
1583 | |
1584 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1585 | // 2301. Why is tie not constexpr? |
1586 | /// tie |
1587 | template<typename... _Elements> |
1588 | constexpr tuple<_Elements&...> |
1589 | tie(_Elements&... __args) noexcept |
1590 | { return tuple<_Elements&...>(__args...); } |
1591 | |
1592 | /// swap |
1593 | template<typename... _Elements> |
1594 | inline |
1595 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
1596 | // Constrained free swap overload, see p0185r1 |
1597 | typename enable_if<__and_<__is_swappable<_Elements>...>::value |
1598 | >::type |
1599 | #else |
1600 | void |
1601 | #endif |
1602 | swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y) |
1603 | noexcept(noexcept(__x.swap(__y))) |
1604 | { __x.swap(__y); } |
1605 | |
1606 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
1607 | template<typename... _Elements> |
1608 | typename enable_if<!__and_<__is_swappable<_Elements>...>::value>::type |
1609 | swap(tuple<_Elements...>&, tuple<_Elements...>&) = delete; |
1610 | #endif |
1611 | |
1612 | // A class (and instance) which can be used in 'tie' when an element |
1613 | // of a tuple is not required. |
1614 | // _GLIBCXX14_CONSTEXPR |
1615 | // 2933. PR for LWG 2773 could be clearer |
1616 | struct _Swallow_assign |
1617 | { |
1618 | template<class _Tp> |
1619 | _GLIBCXX14_CONSTEXPR const _Swallow_assign& |
1620 | operator=(const _Tp&) const |
1621 | { return *this; } |
1622 | }; |
1623 | |
1624 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1625 | // 2773. Making std::ignore constexpr |
1626 | _GLIBCXX17_INLINE constexpr _Swallow_assign ignore{}; |
1627 | |
1628 | /// Partial specialization for tuples |
1629 | template<typename... _Types, typename _Alloc> |
1630 | struct uses_allocator<tuple<_Types...>, _Alloc> : true_type { }; |
1631 | |
1632 | // See stl_pair.h... |
1633 | template<class _T1, class _T2> |
1634 | template<typename... _Args1, typename... _Args2> |
1635 | inline |
1636 | pair<_T1, _T2>:: |
1637 | pair(piecewise_construct_t, |
1638 | tuple<_Args1...> __first, tuple<_Args2...> __second) |
1639 | : pair(__first, __second, |
1640 | typename _Build_index_tuple<sizeof...(_Args1)>::__type(), |
1641 | typename _Build_index_tuple<sizeof...(_Args2)>::__type()) |
1642 | { } |
1643 | |
1644 | template<class _T1, class _T2> |
1645 | template<typename... _Args1, std::size_t... _Indexes1, |
1646 | typename... _Args2, std::size_t... _Indexes2> |
1647 | inline |
1648 | pair<_T1, _T2>:: |
1649 | pair(tuple<_Args1...>& __tuple1, tuple<_Args2...>& __tuple2, |
1650 | _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>) |
1651 | : first(std::forward<_Args1>(std::get<_Indexes1>(__tuple1))...), |
1652 | second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...) |
1653 | { } |
1654 | |
1655 | #if __cplusplus > 201402L |
1656 | # define __cpp_lib_apply 201603 |
1657 | |
1658 | template <typename _Fn, typename _Tuple, size_t... _Idx> |
1659 | constexpr decltype(auto) |
1660 | __apply_impl(_Fn&& __f, _Tuple&& __t, index_sequence<_Idx...>) |
1661 | { |
1662 | return std::__invoke(std::forward<_Fn>(__f), |
1663 | std::get<_Idx>(std::forward<_Tuple>(__t))...); |
1664 | } |
1665 | |
1666 | template <typename _Fn, typename _Tuple> |
1667 | constexpr decltype(auto) |
1668 | apply(_Fn&& __f, _Tuple&& __t) |
1669 | { |
1670 | using _Indices = make_index_sequence<tuple_size_v<decay_t<_Tuple>>>; |
1671 | return std::__apply_impl(std::forward<_Fn>(__f), |
1672 | std::forward<_Tuple>(__t), |
1673 | _Indices{}); |
1674 | } |
1675 | |
1676 | #define __cpp_lib_make_from_tuple 201606 |
1677 | |
1678 | template <typename _Tp, typename _Tuple, size_t... _Idx> |
1679 | constexpr _Tp |
1680 | __make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>) |
1681 | { return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); } |
1682 | |
1683 | template <typename _Tp, typename _Tuple> |
1684 | constexpr _Tp |
1685 | make_from_tuple(_Tuple&& __t) |
1686 | { |
1687 | return __make_from_tuple_impl<_Tp>( |
1688 | std::forward<_Tuple>(__t), |
1689 | make_index_sequence<tuple_size_v<decay_t<_Tuple>>>{}); |
1690 | } |
1691 | #endif // C++17 |
1692 | |
1693 | /// @} |
1694 | |
1695 | _GLIBCXX_END_NAMESPACE_VERSION |
1696 | } // namespace std |
1697 | |
1698 | #endif // C++11 |
1699 | |
1700 | #endif // _GLIBCXX_TUPLE |
1701 | |