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1 | // <tuple> -*- C++ -*- |
2 | ||
85ec4feb | 3 | // Copyright (C) 2007-2018 Free Software Foundation, Inc. |
af13a7a6 BK |
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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
af13a7a6 BK |
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 | ||
748086b7 JJ |
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/>. | |
af13a7a6 BK |
24 | |
25 | /** @file include/tuple | |
26 | * This is a Standard C++ Library header. | |
27 | */ | |
28 | ||
4514bed6 BK |
29 | #ifndef _GLIBCXX_TUPLE |
30 | #define _GLIBCXX_TUPLE 1 | |
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31 | |
32 | #pragma GCC system_header | |
33 | ||
734f5023 | 34 | #if __cplusplus < 201103L |
ab65a4c7 | 35 | # include <bits/c++0x_warning.h> |
57317d2a | 36 | #else |
af13a7a6 | 37 | |
e133ace8 | 38 | #include <utility> |
0611ce44 | 39 | #include <array> |
b8214660 | 40 | #include <bits/uses_allocator.h> |
3e9f67e6 | 41 | #include <bits/invoke.h> |
e133ace8 | 42 | |
12ffa228 BK |
43 | namespace std _GLIBCXX_VISIBILITY(default) |
44 | { | |
45 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
53dc5044 | 46 | |
c0ffa2ba BK |
47 | /** |
48 | * @addtogroup utilities | |
49 | * @{ | |
50 | */ | |
51 | ||
373c0095 FD |
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> | |
ba60f6f9 PC |
70 | struct _Head_base; |
71 | ||
740508be | 72 | template<std::size_t _Idx, typename _Head> |
894d0b15 CF |
73 | struct _Head_base<_Idx, _Head, true> |
74 | : public _Head | |
75 | { | |
0e6ac87e | 76 | constexpr _Head_base() |
894d0b15 CF |
77 | : _Head() { } |
78 | ||
094a14ef | 79 | constexpr _Head_base(const _Head& __h) |
894d0b15 CF |
80 | : _Head(__h) { } |
81 | ||
f4081d13 JW |
82 | constexpr _Head_base(const _Head_base&) = default; |
83 | constexpr _Head_base(_Head_base&&) = default; | |
84 | ||
85 | template<typename _UHead> | |
2c4caf0a | 86 | constexpr _Head_base(_UHead&& __h) |
fe960d92 | 87 | : _Head(std::forward<_UHead>(__h)) { } |
894d0b15 | 88 | |
f4081d13 | 89 | _Head_base(allocator_arg_t, __uses_alloc0) |
b8214660 JW |
90 | : _Head() { } |
91 | ||
92 | template<typename _Alloc> | |
f4081d13 | 93 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
b8214660 JW |
94 | : _Head(allocator_arg, *__a._M_a) { } |
95 | ||
96 | template<typename _Alloc> | |
f4081d13 | 97 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
b8214660 JW |
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 | ||
9480716c DK |
112 | static constexpr _Head& |
113 | _M_head(_Head_base& __b) noexcept { return __b; } | |
2c4caf0a | 114 | |
9480716c DK |
115 | static constexpr const _Head& |
116 | _M_head(const _Head_base& __b) noexcept { return __b; } | |
894d0b15 CF |
117 | }; |
118 | ||
740508be | 119 | template<std::size_t _Idx, typename _Head> |
894d0b15 CF |
120 | struct _Head_base<_Idx, _Head, false> |
121 | { | |
0e6ac87e | 122 | constexpr _Head_base() |
894d0b15 CF |
123 | : _M_head_impl() { } |
124 | ||
094a14ef | 125 | constexpr _Head_base(const _Head& __h) |
894d0b15 CF |
126 | : _M_head_impl(__h) { } |
127 | ||
f4081d13 JW |
128 | constexpr _Head_base(const _Head_base&) = default; |
129 | constexpr _Head_base(_Head_base&&) = default; | |
130 | ||
131 | template<typename _UHead> | |
2c4caf0a | 132 | constexpr _Head_base(_UHead&& __h) |
fe960d92 | 133 | : _M_head_impl(std::forward<_UHead>(__h)) { } |
894d0b15 | 134 | |
f4081d13 | 135 | _Head_base(allocator_arg_t, __uses_alloc0) |
b8214660 JW |
136 | : _M_head_impl() { } |
137 | ||
138 | template<typename _Alloc> | |
f4081d13 | 139 | _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
b8214660 JW |
140 | : _M_head_impl(allocator_arg, *__a._M_a) { } |
141 | ||
142 | template<typename _Alloc> | |
f4081d13 | 143 | _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
b8214660 JW |
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 | ||
9480716c DK |
159 | static constexpr _Head& |
160 | _M_head(_Head_base& __b) noexcept { return __b._M_head_impl; } | |
2c4caf0a | 161 | |
9480716c DK |
162 | static constexpr const _Head& |
163 | _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; } | |
894d0b15 | 164 | |
9480716c | 165 | _Head _M_head_impl; |
894d0b15 CF |
166 | }; |
167 | ||
168 | /** | |
894d0b15 CF |
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. | |
894d0b15 | 175 | */ |
740508be | 176 | template<std::size_t _Idx, typename... _Elements> |
33ac58d5 | 177 | struct _Tuple_impl; |
894d0b15 | 178 | |
894d0b15 | 179 | /** |
894d0b15 CF |
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). | |
894d0b15 | 183 | */ |
740508be | 184 | template<std::size_t _Idx, typename _Head, typename... _Tail> |
894d0b15 CF |
185 | struct _Tuple_impl<_Idx, _Head, _Tail...> |
186 | : public _Tuple_impl<_Idx + 1, _Tail...>, | |
373c0095 | 187 | private _Head_base<_Idx, _Head> |
894d0b15 | 188 | { |
1aa1114b PC |
189 | template<std::size_t, typename...> friend class _Tuple_impl; |
190 | ||
894d0b15 | 191 | typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited; |
373c0095 | 192 | typedef _Head_base<_Idx, _Head> _Base; |
894d0b15 | 193 | |
33ac58d5 | 194 | static constexpr _Head& |
9480716c | 195 | _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
2c4caf0a | 196 | |
9480716c DK |
197 | static constexpr const _Head& |
198 | _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } | |
894d0b15 | 199 | |
9480716c DK |
200 | static constexpr _Inherited& |
201 | _M_tail(_Tuple_impl& __t) noexcept { return __t; } | |
2c4caf0a | 202 | |
9480716c DK |
203 | static constexpr const _Inherited& |
204 | _M_tail(const _Tuple_impl& __t) noexcept { return __t; } | |
894d0b15 | 205 | |
0e6ac87e | 206 | constexpr _Tuple_impl() |
894d0b15 CF |
207 | : _Inherited(), _Base() { } |
208 | ||
33ac58d5 | 209 | explicit |
094a14ef | 210 | constexpr _Tuple_impl(const _Head& __head, const _Tail&... __tail) |
894d0b15 CF |
211 | : _Inherited(__tail...), _Base(__head) { } |
212 | ||
b8214660 | 213 | template<typename _UHead, typename... _UTail, typename = typename |
33ac58d5 | 214 | enable_if<sizeof...(_Tail) == sizeof...(_UTail)>::type> |
ba60f6f9 | 215 | explicit |
2c4caf0a | 216 | constexpr _Tuple_impl(_UHead&& __head, _UTail&&... __tail) |
b5b5e640 PC |
217 | : _Inherited(std::forward<_UTail>(__tail)...), |
218 | _Base(std::forward<_UHead>(__head)) { } | |
894d0b15 | 219 | |
094a14ef | 220 | constexpr _Tuple_impl(const _Tuple_impl&) = default; |
894d0b15 | 221 | |
fae3f459 | 222 | constexpr |
3fe2ddae VV |
223 | _Tuple_impl(_Tuple_impl&& __in) |
224 | noexcept(__and_<is_nothrow_move_constructible<_Head>, | |
dd7b175e | 225 | is_nothrow_move_constructible<_Inherited>>::value) |
33ac58d5 | 226 | : _Inherited(std::move(_M_tail(__in))), |
9480716c | 227 | _Base(std::forward<_Head>(_M_head(__in))) { } |
ba60f6f9 | 228 | |
894d0b15 | 229 | template<typename... _UElements> |
a7d0c94e | 230 | constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in) |
9480716c DK |
231 | : _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
232 | _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { } | |
ba60f6f9 | 233 | |
78a869ec | 234 | template<typename _UHead, typename... _UTails> |
3fe2ddae | 235 | constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
fae3f459 PC |
236 | : _Inherited(std::move |
237 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), | |
9480716c DK |
238 | _Base(std::forward<_UHead> |
239 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { } | |
894d0b15 | 240 | |
b8214660 JW |
241 | template<typename _Alloc> |
242 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) | |
243 | : _Inherited(__tag, __a), | |
f4081d13 | 244 | _Base(__tag, __use_alloc<_Head>(__a)) { } |
b8214660 JW |
245 | |
246 | template<typename _Alloc> | |
247 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, | |
dd7b175e | 248 | const _Head& __head, const _Tail&... __tail) |
b8214660 JW |
249 | : _Inherited(__tag, __a, __tail...), |
250 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { } | |
251 | ||
252 | template<typename _Alloc, typename _UHead, typename... _UTail, | |
dd7b175e PC |
253 | typename = typename enable_if<sizeof...(_Tail) |
254 | == sizeof...(_UTail)>::type> | |
b8214660 JW |
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) | |
33ac58d5 | 264 | : _Inherited(__tag, __a, _M_tail(__in)), |
9480716c | 265 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { } |
b8214660 JW |
266 | |
267 | template<typename _Alloc> | |
268 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, | |
269 | _Tuple_impl&& __in) | |
33ac58d5 | 270 | : _Inherited(__tag, __a, std::move(_M_tail(__in))), |
b8214660 | 271 | _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
9480716c | 272 | std::forward<_Head>(_M_head(__in))) { } |
b8214660 JW |
273 | |
274 | template<typename _Alloc, typename... _UElements> | |
275 | _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, | |
276 | const _Tuple_impl<_Idx, _UElements...>& __in) | |
9480716c DK |
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)) { } | |
b8214660 JW |
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) | |
9480716c DK |
285 | : _Inherited(__tag, __a, std::move |
286 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), | |
b8214660 | 287 | _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
9480716c DK |
288 | std::forward<_UHead> |
289 | (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { } | |
b8214660 | 290 | |
894d0b15 CF |
291 | _Tuple_impl& |
292 | operator=(const _Tuple_impl& __in) | |
293 | { | |
9480716c DK |
294 | _M_head(*this) = _M_head(__in); |
295 | _M_tail(*this) = _M_tail(__in); | |
894d0b15 CF |
296 | return *this; |
297 | } | |
ba60f6f9 PC |
298 | |
299 | _Tuple_impl& | |
300 | operator=(_Tuple_impl&& __in) | |
dd7b175e PC |
301 | noexcept(__and_<is_nothrow_move_assignable<_Head>, |
302 | is_nothrow_move_assignable<_Inherited>>::value) | |
ba60f6f9 | 303 | { |
9480716c DK |
304 | _M_head(*this) = std::forward<_Head>(_M_head(__in)); |
305 | _M_tail(*this) = std::move(_M_tail(__in)); | |
ba60f6f9 PC |
306 | return *this; |
307 | } | |
308 | ||
309 | template<typename... _UElements> | |
310 | _Tuple_impl& | |
311 | operator=(const _Tuple_impl<_Idx, _UElements...>& __in) | |
312 | { | |
9480716c DK |
313 | _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in); |
314 | _M_tail(*this) = _Tuple_impl<_Idx, _UElements...>::_M_tail(__in); | |
ba60f6f9 PC |
315 | return *this; |
316 | } | |
317 | ||
78a869ec | 318 | template<typename _UHead, typename... _UTails> |
ba60f6f9 | 319 | _Tuple_impl& |
78a869ec | 320 | operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
ba60f6f9 | 321 | { |
9480716c DK |
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)); | |
ba60f6f9 PC |
326 | return *this; |
327 | } | |
3e93b275 | 328 | |
fe960d92 | 329 | protected: |
3e93b275 | 330 | void |
1aa1114b | 331 | _M_swap(_Tuple_impl& __in) |
ddb63209 VV |
332 | noexcept(__is_nothrow_swappable<_Head>::value |
333 | && noexcept(_M_tail(__in)._M_swap(_M_tail(__in)))) | |
3e93b275 | 334 | { |
1aa1114b | 335 | using std::swap; |
9480716c DK |
336 | swap(_M_head(*this), _M_head(__in)); |
337 | _Inherited::_M_swap(_M_tail(__in)); | |
3e93b275 | 338 | } |
894d0b15 CF |
339 | }; |
340 | ||
3ecec1ef JW |
341 | // Basis case of inheritance recursion. |
342 | template<std::size_t _Idx, typename _Head> | |
343 | struct _Tuple_impl<_Idx, _Head> | |
373c0095 | 344 | : private _Head_base<_Idx, _Head> |
3ecec1ef JW |
345 | { |
346 | template<std::size_t, typename...> friend class _Tuple_impl; | |
347 | ||
373c0095 | 348 | typedef _Head_base<_Idx, _Head> _Base; |
3ecec1ef JW |
349 | |
350 | static constexpr _Head& | |
351 | _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } | |
352 | ||
353 | static constexpr const _Head& | |
354 | _M_head(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 | ||
3fe2ddae | 363 | template<typename _UHead> |
3ecec1ef JW |
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 | |
3fe2ddae | 371 | _Tuple_impl(_Tuple_impl&& __in) |
3ecec1ef JW |
372 | noexcept(is_nothrow_move_constructible<_Head>::value) |
373 | : _Base(std::forward<_Head>(_M_head(__in))) { } | |
374 | ||
3fe2ddae | 375 | template<typename _UHead> |
3ecec1ef JW |
376 | constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UHead>& __in) |
377 | : _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in)) { } | |
378 | ||
3fe2ddae | 379 | template<typename _UHead> |
3ecec1ef JW |
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) | |
ddb63209 | 458 | noexcept(__is_nothrow_swappable<_Head>::value) |
3ecec1ef JW |
459 | { |
460 | using std::swap; | |
461 | swap(_M_head(*this), _M_head(__in)); | |
462 | } | |
463 | }; | |
464 | ||
bf7818bf VV |
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 | } | |
5e2f2cd5 VV |
493 | |
494 | template<typename _SrcTuple> | |
495 | static constexpr bool _NonNestedTuple() | |
496 | { | |
057ce497 VV |
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...>>, | |
5e2f2cd5 VV |
502 | __not_<is_constructible<_Elements..., _SrcTuple>> |
503 | >::value; | |
504 | } | |
fb334765 VV |
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 | } | |
bf7818bf VV |
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 | } | |
5e2f2cd5 VV |
541 | |
542 | template<typename... _UElements> | |
543 | static constexpr bool _NonNestedTuple() | |
544 | { | |
545 | return true; | |
546 | } | |
fb334765 VV |
547 | template<typename... _UElements> |
548 | static constexpr bool _NotSameTuple() | |
549 | { | |
550 | return true; | |
551 | } | |
bf7818bf VV |
552 | }; |
553 | ||
2c4caf0a | 554 | /// Primary class template, tuple |
33ac58d5 | 555 | template<typename... _Elements> |
894d0b15 CF |
556 | class tuple : public _Tuple_impl<0, _Elements...> |
557 | { | |
558 | typedef _Tuple_impl<0, _Elements...> _Inherited; | |
559 | ||
bf7818bf VV |
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 | } | |
f7632193 VV |
569 | static constexpr bool _ImplicitlyDefaultConstructibleTuple() |
570 | { | |
571 | return __and_<__is_implicitly_default_constructible<_Elements>...> | |
572 | ::value; | |
573 | } | |
bf7818bf VV |
574 | }; |
575 | ||
894d0b15 | 576 | public: |
bf7818bf VV |
577 | template<typename _Dummy = void, |
578 | typename enable_if<_TC2<_Dummy>:: | |
f7632193 | 579 | _ImplicitlyDefaultConstructibleTuple(), |
bf7818bf | 580 | bool>::type = true> |
0e6ac87e | 581 | constexpr tuple() |
894d0b15 CF |
582 | : _Inherited() { } |
583 | ||
f7632193 VV |
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 | ||
bf7818bf VV |
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) | |
894d0b15 CF |
609 | : _Inherited(__elements...) { } |
610 | ||
bf7818bf VV |
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 = | |
b7021006 VV |
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)) | |
48035dfb | 634 | && !is_same<tuple<_Elements...>, |
b7021006 | 635 | tuple<_UElements...>>::value, |
bf7818bf VV |
636 | _Elements...>; |
637 | ||
638 | template<typename... _UElements, typename | |
fb334765 | 639 | enable_if< |
b7021006 | 640 | _TMC<_UElements...>::template |
bf7818bf VV |
641 | _MoveConstructibleTuple<_UElements...>() |
642 | && _TMC<_UElements...>::template | |
643 | _ImplicitlyMoveConvertibleTuple<_UElements...>() | |
644 | && (sizeof...(_Elements) >= 1), | |
645 | bool>::type=true> | |
2c4caf0a | 646 | constexpr tuple(_UElements&&... __elements) |
bf7818bf VV |
647 | : _Inherited(std::forward<_UElements>(__elements)...) { } |
648 | ||
649 | template<typename... _UElements, typename | |
fb334765 | 650 | enable_if< |
b7021006 | 651 | _TMC<_UElements...>::template |
bf7818bf VV |
652 | _MoveConstructibleTuple<_UElements...>() |
653 | && !_TMC<_UElements...>::template | |
654 | _ImplicitlyMoveConvertibleTuple<_UElements...>() | |
655 | && (sizeof...(_Elements) >= 1), | |
656 | bool>::type=false> | |
657 | explicit constexpr tuple(_UElements&&... __elements) | |
b5b5e640 | 658 | : _Inherited(std::forward<_UElements>(__elements)...) { } |
894d0b15 | 659 | |
094a14ef | 660 | constexpr tuple(const tuple&) = default; |
2c4caf0a | 661 | |
33ac58d5 | 662 | constexpr tuple(tuple&&) = default; |
ba60f6f9 | 663 | |
5e2f2cd5 VV |
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 | |
b7021006 | 671 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 672 | _ConstructibleTuple<_UElements...>() |
b7021006 | 673 | && _TMCT<_UElements...>::template |
5e2f2cd5 VV |
674 | _ImplicitlyConvertibleTuple<_UElements...>() |
675 | && _TNTC<_Dummy>::template | |
676 | _NonNestedTuple<const tuple<_UElements...>&>(), | |
bf7818bf | 677 | bool>::type=true> |
a7d0c94e | 678 | constexpr tuple(const tuple<_UElements...>& __in) |
0a5c2065 PC |
679 | : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
680 | { } | |
ba60f6f9 | 681 | |
5e2f2cd5 | 682 | template<typename... _UElements, typename _Dummy = void, typename |
b7021006 | 683 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 684 | _ConstructibleTuple<_UElements...>() |
b7021006 | 685 | && !_TMCT<_UElements...>::template |
5e2f2cd5 VV |
686 | _ImplicitlyConvertibleTuple<_UElements...>() |
687 | && _TNTC<_Dummy>::template | |
688 | _NonNestedTuple<const tuple<_UElements...>&>(), | |
bf7818bf VV |
689 | bool>::type=false> |
690 | explicit constexpr tuple(const tuple<_UElements...>& __in) | |
691 | : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) | |
692 | { } | |
693 | ||
5e2f2cd5 | 694 | template<typename... _UElements, typename _Dummy = void, typename |
b7021006 | 695 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 696 | _MoveConstructibleTuple<_UElements...>() |
b7021006 | 697 | && _TMCT<_UElements...>::template |
5e2f2cd5 VV |
698 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
699 | && _TNTC<_Dummy>::template | |
700 | _NonNestedTuple<tuple<_UElements...>&&>(), | |
bf7818bf | 701 | bool>::type=true> |
a7d0c94e | 702 | constexpr tuple(tuple<_UElements...>&& __in) |
0a5c2065 | 703 | : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { } |
894d0b15 | 704 | |
5e2f2cd5 | 705 | template<typename... _UElements, typename _Dummy = void, typename |
b7021006 | 706 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 707 | _MoveConstructibleTuple<_UElements...>() |
b7021006 | 708 | && !_TMCT<_UElements...>::template |
5e2f2cd5 VV |
709 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
710 | && _TNTC<_Dummy>::template | |
711 | _NonNestedTuple<tuple<_UElements...>&&>(), | |
bf7818bf VV |
712 | bool>::type=false> |
713 | explicit constexpr tuple(tuple<_UElements...>&& __in) | |
714 | : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { } | |
715 | ||
2c4caf0a | 716 | // Allocator-extended constructors. |
b8214660 JW |
717 | |
718 | template<typename _Alloc> | |
719 | tuple(allocator_arg_t __tag, const _Alloc& __a) | |
720 | : _Inherited(__tag, __a) { } | |
721 | ||
bf7818bf VV |
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> | |
b8214660 JW |
729 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
730 | const _Elements&... __elements) | |
731 | : _Inherited(__tag, __a, __elements...) { } | |
732 | ||
bf7818bf VV |
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> | |
b8214660 JW |
750 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
751 | _UElements&&... __elements) | |
752 | : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...) | |
753 | { } | |
754 | ||
bf7818bf VV |
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 | ||
b8214660 JW |
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 | ||
7a667453 VV |
774 | template<typename _Alloc, typename _Dummy = void, |
775 | typename... _UElements, typename | |
b7021006 | 776 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 777 | _ConstructibleTuple<_UElements...>() |
b7021006 | 778 | && _TMCT<_UElements...>::template |
7a667453 VV |
779 | _ImplicitlyConvertibleTuple<_UElements...>() |
780 | && _TNTC<_Dummy>::template | |
781 | _NonNestedTuple<tuple<_UElements...>&&>(), | |
bf7818bf | 782 | bool>::type=true> |
b8214660 JW |
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 | ||
7a667453 VV |
789 | template<typename _Alloc, typename _Dummy = void, |
790 | typename... _UElements, typename | |
b7021006 | 791 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 792 | _ConstructibleTuple<_UElements...>() |
b7021006 | 793 | && !_TMCT<_UElements...>::template |
7a667453 VV |
794 | _ImplicitlyConvertibleTuple<_UElements...>() |
795 | && _TNTC<_Dummy>::template | |
796 | _NonNestedTuple<tuple<_UElements...>&&>(), | |
bf7818bf VV |
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 | ||
7a667453 VV |
804 | template<typename _Alloc, typename _Dummy = void, |
805 | typename... _UElements, typename | |
b7021006 | 806 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 807 | _MoveConstructibleTuple<_UElements...>() |
b7021006 | 808 | && _TMCT<_UElements...>::template |
7a667453 VV |
809 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
810 | && _TNTC<_Dummy>::template | |
811 | _NonNestedTuple<tuple<_UElements...>&&>(), | |
bf7818bf | 812 | bool>::type=true> |
b8214660 JW |
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 | ||
7a667453 VV |
819 | template<typename _Alloc, typename _Dummy = void, |
820 | typename... _UElements, typename | |
b7021006 | 821 | enable_if<_TMCT<_UElements...>::template |
bf7818bf | 822 | _MoveConstructibleTuple<_UElements...>() |
b7021006 | 823 | && !_TMCT<_UElements...>::template |
7a667453 VV |
824 | _ImplicitlyMoveConvertibleTuple<_UElements...>() |
825 | && _TNTC<_Dummy>::template | |
826 | _NonNestedTuple<tuple<_UElements...>&&>(), | |
bf7818bf VV |
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 | ||
894d0b15 | 834 | tuple& |
3fe2ddae | 835 | operator=(const tuple& __in) |
894d0b15 CF |
836 | { |
837 | static_cast<_Inherited&>(*this) = __in; | |
838 | return *this; | |
839 | } | |
ba60f6f9 PC |
840 | |
841 | tuple& | |
3fe2ddae | 842 | operator=(tuple&& __in) |
dd7b175e | 843 | noexcept(is_nothrow_move_assignable<_Inherited>::value) |
ba60f6f9 PC |
844 | { |
845 | static_cast<_Inherited&>(*this) = std::move(__in); | |
846 | return *this; | |
847 | } | |
848 | ||
ca9e949f VV |
849 | template<typename... _UElements> |
850 | typename | |
dd7b175e | 851 | enable_if<sizeof...(_UElements) |
ca9e949f | 852 | == sizeof...(_Elements), tuple&>::type |
ba60f6f9 PC |
853 | operator=(const tuple<_UElements...>& __in) |
854 | { | |
855 | static_cast<_Inherited&>(*this) = __in; | |
856 | return *this; | |
857 | } | |
858 | ||
ca9e949f VV |
859 | template<typename... _UElements> |
860 | typename | |
dd7b175e | 861 | enable_if<sizeof...(_UElements) |
ca9e949f | 862 | == sizeof...(_Elements), tuple&>::type |
ba60f6f9 PC |
863 | operator=(tuple<_UElements...>&& __in) |
864 | { | |
865 | static_cast<_Inherited&>(*this) = std::move(__in); | |
866 | return *this; | |
867 | } | |
3e93b275 CF |
868 | |
869 | void | |
ff74fd13 | 870 | swap(tuple& __in) |
1aa1114b PC |
871 | noexcept(noexcept(__in._M_swap(__in))) |
872 | { _Inherited::_M_swap(__in); } | |
894d0b15 CF |
873 | }; |
874 | ||
af181c91 JW |
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 | ||
2c4caf0a | 888 | // Explicit specialization, zero-element tuple. |
bf7818bf | 889 | template<> |
3e93b275 CF |
890 | class tuple<> |
891 | { | |
892 | public: | |
1aa1114b | 893 | void swap(tuple&) noexcept { /* no-op */ } |
dbc6221f VV |
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&) { } | |
3e93b275 | 902 | }; |
939759fc | 903 | |
2c4caf0a BK |
904 | /// Partial specialization, 2-element tuple. |
905 | /// Includes construction and assignment from a pair. | |
894d0b15 CF |
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: | |
bf7818bf VV |
912 | template <typename _U1 = _T1, |
913 | typename _U2 = _T2, | |
914 | typename enable_if<__and_< | |
f7632193 VV |
915 | __is_implicitly_default_constructible<_U1>, |
916 | __is_implicitly_default_constructible<_U2>> | |
bf7818bf VV |
917 | ::value, bool>::type = true> |
918 | ||
0e6ac87e | 919 | constexpr tuple() |
894d0b15 CF |
920 | : _Inherited() { } |
921 | ||
f7632193 VV |
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 | ||
bf7818bf VV |
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 | |
4b21c3ea VV |
967 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>() |
968 | && !is_same<typename decay<_U1>::type, | |
969 | allocator_arg_t>::value, | |
bf7818bf | 970 | bool>::type = true> |
2c4caf0a | 971 | constexpr tuple(_U1&& __a1, _U2&& __a2) |
ba60f6f9 | 972 | : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { } |
894d0b15 | 973 | |
bf7818bf VV |
974 | template<typename _U1, typename _U2, typename |
975 | enable_if<_TMC::template | |
976 | _MoveConstructibleTuple<_U1, _U2>() | |
977 | && !_TMC::template | |
4b21c3ea VV |
978 | _ImplicitlyMoveConvertibleTuple<_U1, _U2>() |
979 | && !is_same<typename decay<_U1>::type, | |
980 | allocator_arg_t>::value, | |
bf7818bf VV |
981 | bool>::type = false> |
982 | explicit constexpr tuple(_U1&& __a1, _U2&& __a2) | |
983 | : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { } | |
984 | ||
094a14ef | 985 | constexpr tuple(const tuple&) = default; |
2c4caf0a | 986 | |
a7d0c94e | 987 | constexpr tuple(tuple&&) = default; |
ba60f6f9 | 988 | |
bf7818bf VV |
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> | |
a7d0c94e | 995 | constexpr tuple(const tuple<_U1, _U2>& __in) |
b5b5e640 | 996 | : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { } |
ba60f6f9 | 997 | |
bf7818bf VV |
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> | |
a7d0c94e | 1013 | constexpr tuple(tuple<_U1, _U2>&& __in) |
4c650853 | 1014 | : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { } |
ba60f6f9 | 1015 | |
bf7818bf VV |
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> | |
2c4caf0a | 1031 | constexpr tuple(const pair<_U1, _U2>& __in) |
b5b5e640 | 1032 | : _Inherited(__in.first, __in.second) { } |
ba60f6f9 | 1033 | |
bf7818bf VV |
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> | |
fae3f459 | 1049 | constexpr tuple(pair<_U1, _U2>&& __in) |
87b2e746 PC |
1050 | : _Inherited(std::forward<_U1>(__in.first), |
1051 | std::forward<_U2>(__in.second)) { } | |
894d0b15 | 1052 | |
bf7818bf VV |
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 | ||
2c4caf0a | 1063 | // Allocator-extended constructors. |
b8214660 JW |
1064 | |
1065 | template<typename _Alloc> | |
1066 | tuple(allocator_arg_t __tag, const _Alloc& __a) | |
1067 | : _Inherited(__tag, __a) { } | |
1068 | ||
bf7818bf VV |
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 | ||
b8214660 JW |
1077 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
1078 | const _T1& __a1, const _T2& __a2) | |
1079 | : _Inherited(__tag, __a, __a1, __a2) { } | |
1080 | ||
bf7818bf VV |
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> | |
b8214660 JW |
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 | ||
bf7818bf VV |
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 | ||
b8214660 JW |
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 | ||
bf7818bf VV |
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> | |
b8214660 JW |
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 | ||
bf7818bf VV |
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> | |
b8214660 JW |
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 | ||
bf7818bf VV |
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> | |
b8214660 JW |
1173 | tuple(allocator_arg_t __tag, const _Alloc& __a, |
1174 | const pair<_U1, _U2>& __in) | |
1175 | : _Inherited(__tag, __a, __in.first, __in.second) { } | |
1176 | ||
bf7818bf VV |
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> | |
b8214660 JW |
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 | ||
bf7818bf VV |
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 | ||
894d0b15 | 1208 | tuple& |
3fe2ddae | 1209 | operator=(const tuple& __in) |
894d0b15 CF |
1210 | { |
1211 | static_cast<_Inherited&>(*this) = __in; | |
1212 | return *this; | |
1213 | } | |
1214 | ||
ba60f6f9 | 1215 | tuple& |
3fe2ddae | 1216 | operator=(tuple&& __in) |
dd7b175e | 1217 | noexcept(is_nothrow_move_assignable<_Inherited>::value) |
ba60f6f9 PC |
1218 | { |
1219 | static_cast<_Inherited&>(*this) = std::move(__in); | |
1220 | return *this; | |
1221 | } | |
1222 | ||
1223 | template<typename _U1, typename _U2> | |
3fe2ddae | 1224 | tuple& |
ba60f6f9 PC |
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> | |
3fe2ddae | 1232 | tuple& |
ba60f6f9 PC |
1233 | operator=(tuple<_U1, _U2>&& __in) |
1234 | { | |
1235 | static_cast<_Inherited&>(*this) = std::move(__in); | |
1236 | return *this; | |
1237 | } | |
1238 | ||
894d0b15 | 1239 | template<typename _U1, typename _U2> |
3fe2ddae | 1240 | tuple& |
894d0b15 CF |
1241 | operator=(const pair<_U1, _U2>& __in) |
1242 | { | |
9480716c DK |
1243 | this->_M_head(*this) = __in.first; |
1244 | this->_M_tail(*this)._M_head(*this) = __in.second; | |
894d0b15 CF |
1245 | return *this; |
1246 | } | |
ba60f6f9 PC |
1247 | |
1248 | template<typename _U1, typename _U2> | |
3fe2ddae | 1249 | tuple& |
173f26ae | 1250 | operator=(pair<_U1, _U2>&& __in) |
ba60f6f9 | 1251 | { |
9480716c DK |
1252 | this->_M_head(*this) = std::forward<_U1>(__in.first); |
1253 | this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__in.second); | |
ba60f6f9 PC |
1254 | return *this; |
1255 | } | |
3e93b275 CF |
1256 | |
1257 | void | |
ff74fd13 | 1258 | swap(tuple& __in) |
1aa1114b PC |
1259 | noexcept(noexcept(__in._M_swap(__in))) |
1260 | { _Inherited::_M_swap(__in); } | |
894d0b15 CF |
1261 | }; |
1262 | ||
1263 | ||
3c040fa4 JW |
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> | |
288695f7 | 1271 | inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; |
3c040fa4 JW |
1272 | #endif |
1273 | ||
894d0b15 | 1274 | /** |
894d0b15 CF |
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. | |
894d0b15 | 1277 | */ |
740508be | 1278 | template<std::size_t __i, typename _Head, typename... _Tail> |
894d0b15 CF |
1279 | struct tuple_element<__i, tuple<_Head, _Tail...> > |
1280 | : tuple_element<__i - 1, tuple<_Tail...> > { }; | |
1281 | ||
1282 | /** | |
894d0b15 | 1283 | * Basis case for tuple_element: The first element is the one we're seeking. |
894d0b15 CF |
1284 | */ |
1285 | template<typename _Head, typename... _Tail> | |
1286 | struct tuple_element<0, tuple<_Head, _Tail...> > | |
1287 | { | |
1288 | typedef _Head type; | |
1289 | }; | |
1290 | ||
3c040fa4 JW |
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 | }; | |
137422c8 | 1300 | |
740508be | 1301 | template<std::size_t __i, typename _Head, typename... _Tail> |
af222e74 | 1302 | constexpr _Head& |
173f26ae | 1303 | __get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
9480716c | 1304 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
894d0b15 | 1305 | |
740508be | 1306 | template<std::size_t __i, typename _Head, typename... _Tail> |
af222e74 | 1307 | constexpr const _Head& |
173f26ae | 1308 | __get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
9480716c | 1309 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
894d0b15 | 1310 | |
af222e74 | 1311 | /// Return a reference to the ith element of a tuple. |
740508be | 1312 | template<std::size_t __i, typename... _Elements> |
af222e74 | 1313 | constexpr __tuple_element_t<__i, tuple<_Elements...>>& |
1aa1114b | 1314 | get(tuple<_Elements...>& __t) noexcept |
39e6a690 | 1315 | { return std::__get_helper<__i>(__t); } |
894d0b15 | 1316 | |
af222e74 | 1317 | /// Return a const reference to the ith element of a const tuple. |
740508be | 1318 | template<std::size_t __i, typename... _Elements> |
af222e74 | 1319 | constexpr const __tuple_element_t<__i, tuple<_Elements...>>& |
1aa1114b | 1320 | get(const tuple<_Elements...>& __t) noexcept |
39e6a690 | 1321 | { return std::__get_helper<__i>(__t); } |
894d0b15 | 1322 | |
af222e74 | 1323 | /// Return an rvalue reference to the ith element of a tuple rvalue. |
1aa1114b | 1324 | template<std::size_t __i, typename... _Elements> |
af222e74 | 1325 | constexpr __tuple_element_t<__i, tuple<_Elements...>>&& |
1aa1114b | 1326 | get(tuple<_Elements...>&& __t) noexcept |
af222e74 JW |
1327 | { |
1328 | typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type; | |
1329 | return std::forward<__element_type&&>(std::get<__i>(__t)); | |
1330 | } | |
1aa1114b | 1331 | |
ccbbf8df VV |
1332 | /// Return a const rvalue reference to the ith element of a const tuple rvalue. |
1333 | template<std::size_t __i, typename... _Elements> | |
1334 | constexpr const __tuple_element_t<__i, tuple<_Elements...>>&& | |
1335 | get(const tuple<_Elements...>&& __t) noexcept | |
1336 | { | |
1337 | typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type; | |
1338 | return std::forward<const __element_type&&>(std::get<__i>(__t)); | |
1339 | } | |
1340 | ||
b5a8fed6 | 1341 | #if __cplusplus > 201103L |
a15f7cb8 ESR |
1342 | |
1343 | #define __cpp_lib_tuples_by_type 201304 | |
1344 | ||
b5a8fed6 | 1345 | template<typename _Head, size_t __i, typename... _Tail> |
af222e74 | 1346 | constexpr _Head& |
b5a8fed6 JW |
1347 | __get_helper2(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
1348 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } | |
1349 | ||
1350 | template<typename _Head, size_t __i, typename... _Tail> | |
af222e74 | 1351 | constexpr const _Head& |
b5a8fed6 JW |
1352 | __get_helper2(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
1353 | { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } | |
1354 | ||
af222e74 | 1355 | /// Return a reference to the unique element of type _Tp of a tuple. |
b5a8fed6 JW |
1356 | template <typename _Tp, typename... _Types> |
1357 | constexpr _Tp& | |
1358 | get(tuple<_Types...>& __t) noexcept | |
39e6a690 | 1359 | { return std::__get_helper2<_Tp>(__t); } |
b5a8fed6 | 1360 | |
af222e74 | 1361 | /// Return a reference to the unique element of type _Tp of a tuple rvalue. |
b5a8fed6 JW |
1362 | template <typename _Tp, typename... _Types> |
1363 | constexpr _Tp&& | |
1364 | get(tuple<_Types...>&& __t) noexcept | |
af222e74 | 1365 | { return std::forward<_Tp&&>(std::__get_helper2<_Tp>(__t)); } |
b5a8fed6 | 1366 | |
af222e74 | 1367 | /// Return a const reference to the unique element of type _Tp of a tuple. |
b5a8fed6 JW |
1368 | template <typename _Tp, typename... _Types> |
1369 | constexpr const _Tp& | |
1370 | get(const tuple<_Types...>& __t) noexcept | |
39e6a690 | 1371 | { return std::__get_helper2<_Tp>(__t); } |
ccbbf8df VV |
1372 | |
1373 | /// Return a const reference to the unique element of type _Tp of | |
1374 | /// a const tuple rvalue. | |
1375 | template <typename _Tp, typename... _Types> | |
1376 | constexpr const _Tp&& | |
1377 | get(const tuple<_Types...>&& __t) noexcept | |
1378 | { return std::forward<const _Tp&&>(std::__get_helper2<_Tp>(__t)); } | |
b5a8fed6 JW |
1379 | #endif |
1380 | ||
af222e74 JW |
1381 | // This class performs the comparison operations on tuples |
1382 | template<typename _Tp, typename _Up, size_t __i, size_t __size> | |
1383 | struct __tuple_compare | |
894d0b15 | 1384 | { |
af222e74 | 1385 | static constexpr bool |
a7d0c94e | 1386 | __eq(const _Tp& __t, const _Up& __u) |
894d0b15 | 1387 | { |
75e75a08 | 1388 | return bool(std::get<__i>(__t) == std::get<__i>(__u)) |
af222e74 | 1389 | && __tuple_compare<_Tp, _Up, __i + 1, __size>::__eq(__t, __u); |
894d0b15 | 1390 | } |
33ac58d5 | 1391 | |
af222e74 | 1392 | static constexpr bool |
a7d0c94e | 1393 | __less(const _Tp& __t, const _Up& __u) |
894d0b15 | 1394 | { |
75e75a08 | 1395 | return bool(std::get<__i>(__t) < std::get<__i>(__u)) |
af222e74 JW |
1396 | || (!bool(std::get<__i>(__u) < std::get<__i>(__t)) |
1397 | && __tuple_compare<_Tp, _Up, __i + 1, __size>::__less(__t, __u)); | |
894d0b15 CF |
1398 | } |
1399 | }; | |
1400 | ||
af222e74 JW |
1401 | template<typename _Tp, typename _Up, size_t __size> |
1402 | struct __tuple_compare<_Tp, _Up, __size, __size> | |
894d0b15 | 1403 | { |
af222e74 | 1404 | static constexpr bool |
a7d0c94e | 1405 | __eq(const _Tp&, const _Up&) { return true; } |
33ac58d5 | 1406 | |
af222e74 | 1407 | static constexpr bool |
a7d0c94e | 1408 | __less(const _Tp&, const _Up&) { return false; } |
894d0b15 CF |
1409 | }; |
1410 | ||
1411 | template<typename... _TElements, typename... _UElements> | |
a9ba8ba5 | 1412 | constexpr bool |
894d0b15 CF |
1413 | operator==(const tuple<_TElements...>& __t, |
1414 | const tuple<_UElements...>& __u) | |
1415 | { | |
af222e74 JW |
1416 | static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
1417 | "tuple objects can only be compared if they have equal sizes."); | |
1418 | using __compare = __tuple_compare<tuple<_TElements...>, | |
1419 | tuple<_UElements...>, | |
1420 | 0, sizeof...(_TElements)>; | |
1421 | return __compare::__eq(__t, __u); | |
894d0b15 CF |
1422 | } |
1423 | ||
1424 | template<typename... _TElements, typename... _UElements> | |
a9ba8ba5 | 1425 | constexpr bool |
894d0b15 CF |
1426 | operator<(const tuple<_TElements...>& __t, |
1427 | const tuple<_UElements...>& __u) | |
1428 | { | |
af222e74 JW |
1429 | static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
1430 | "tuple objects can only be compared if they have equal sizes."); | |
1431 | using __compare = __tuple_compare<tuple<_TElements...>, | |
1432 | tuple<_UElements...>, | |
1433 | 0, sizeof...(_TElements)>; | |
1434 | return __compare::__less(__t, __u); | |
894d0b15 CF |
1435 | } |
1436 | ||
1437 | template<typename... _TElements, typename... _UElements> | |
fa409833 | 1438 | constexpr bool |
894d0b15 CF |
1439 | operator!=(const tuple<_TElements...>& __t, |
1440 | const tuple<_UElements...>& __u) | |
1441 | { return !(__t == __u); } | |
1442 | ||
1443 | template<typename... _TElements, typename... _UElements> | |
fa409833 | 1444 | constexpr bool |
894d0b15 CF |
1445 | operator>(const tuple<_TElements...>& __t, |
1446 | const tuple<_UElements...>& __u) | |
1447 | { return __u < __t; } | |
1448 | ||
1449 | template<typename... _TElements, typename... _UElements> | |
fa409833 | 1450 | constexpr bool |
894d0b15 CF |
1451 | operator<=(const tuple<_TElements...>& __t, |
1452 | const tuple<_UElements...>& __u) | |
1453 | { return !(__u < __t); } | |
1454 | ||
1455 | template<typename... _TElements, typename... _UElements> | |
fa409833 | 1456 | constexpr bool |
894d0b15 CF |
1457 | operator>=(const tuple<_TElements...>& __t, |
1458 | const tuple<_UElements...>& __u) | |
1459 | { return !(__t < __u); } | |
1460 | ||
1461 | // NB: DR 705. | |
1462 | template<typename... _Elements> | |
fae3f459 | 1463 | constexpr tuple<typename __decay_and_strip<_Elements>::__type...> |
894d0b15 CF |
1464 | make_tuple(_Elements&&... __args) |
1465 | { | |
1466 | typedef tuple<typename __decay_and_strip<_Elements>::__type...> | |
1467 | __result_type; | |
1468 | return __result_type(std::forward<_Elements>(__args)...); | |
1469 | } | |
1470 | ||
cb2ef49e JW |
1471 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1472 | // 2275. Why is forward_as_tuple not constexpr? | |
5e108459 | 1473 | template<typename... _Elements> |
cb2ef49e | 1474 | constexpr tuple<_Elements&&...> |
1aa1114b | 1475 | forward_as_tuple(_Elements&&... __args) noexcept |
00e9a944 | 1476 | { return tuple<_Elements&&...>(std::forward<_Elements>(__args)...); } |
5e108459 | 1477 | |
af222e74 | 1478 | template<size_t, typename, typename, size_t> |
ac65b7d2 DK |
1479 | struct __make_tuple_impl; |
1480 | ||
af222e74 | 1481 | template<size_t _Idx, typename _Tuple, typename... _Tp, size_t _Nm> |
ac65b7d2 | 1482 | struct __make_tuple_impl<_Idx, tuple<_Tp...>, _Tuple, _Nm> |
af222e74 JW |
1483 | : __make_tuple_impl<_Idx + 1, |
1484 | tuple<_Tp..., __tuple_element_t<_Idx, _Tuple>>, | |
1485 | _Tuple, _Nm> | |
1486 | { }; | |
894d0b15 | 1487 | |
ac65b7d2 DK |
1488 | template<std::size_t _Nm, typename _Tuple, typename... _Tp> |
1489 | struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm> | |
894d0b15 | 1490 | { |
ac65b7d2 DK |
1491 | typedef tuple<_Tp...> __type; |
1492 | }; | |
894d0b15 | 1493 | |
ac65b7d2 DK |
1494 | template<typename _Tuple> |
1495 | struct __do_make_tuple | |
af222e74 | 1496 | : __make_tuple_impl<0, tuple<>, _Tuple, std::tuple_size<_Tuple>::value> |
ac65b7d2 DK |
1497 | { }; |
1498 | ||
1499 | // Returns the std::tuple equivalent of a tuple-like type. | |
1500 | template<typename _Tuple> | |
1501 | struct __make_tuple | |
6791489e | 1502 | : public __do_make_tuple<__remove_cvref_t<_Tuple>> |
ac65b7d2 DK |
1503 | { }; |
1504 | ||
1505 | // Combines several std::tuple's into a single one. | |
1506 | template<typename...> | |
1507 | struct __combine_tuples; | |
1508 | ||
1509 | template<> | |
1510 | struct __combine_tuples<> | |
1511 | { | |
1512 | typedef tuple<> __type; | |
1513 | }; | |
1514 | ||
1515 | template<typename... _Ts> | |
1516 | struct __combine_tuples<tuple<_Ts...>> | |
894d0b15 | 1517 | { |
ac65b7d2 DK |
1518 | typedef tuple<_Ts...> __type; |
1519 | }; | |
1520 | ||
1521 | template<typename... _T1s, typename... _T2s, typename... _Rem> | |
1522 | struct __combine_tuples<tuple<_T1s...>, tuple<_T2s...>, _Rem...> | |
1523 | { | |
1524 | typedef typename __combine_tuples<tuple<_T1s..., _T2s...>, | |
1525 | _Rem...>::__type __type; | |
1526 | }; | |
1527 | ||
1528 | // Computes the result type of tuple_cat given a set of tuple-like types. | |
1529 | template<typename... _Tpls> | |
1530 | struct __tuple_cat_result | |
1531 | { | |
1532 | typedef typename __combine_tuples | |
1533 | <typename __make_tuple<_Tpls>::__type...>::__type __type; | |
1534 | }; | |
1535 | ||
1536 | // Helper to determine the index set for the first tuple-like | |
1537 | // type of a given set. | |
1538 | template<typename...> | |
1539 | struct __make_1st_indices; | |
1540 | ||
1541 | template<> | |
1542 | struct __make_1st_indices<> | |
1543 | { | |
1544 | typedef std::_Index_tuple<> __type; | |
1545 | }; | |
1546 | ||
1547 | template<typename _Tp, typename... _Tpls> | |
1548 | struct __make_1st_indices<_Tp, _Tpls...> | |
1549 | { | |
1550 | typedef typename std::_Build_index_tuple<std::tuple_size< | |
1551 | typename std::remove_reference<_Tp>::type>::value>::__type __type; | |
1552 | }; | |
1553 | ||
1554 | // Performs the actual concatenation by step-wise expanding tuple-like | |
1555 | // objects into the elements, which are finally forwarded into the | |
1556 | // result tuple. | |
1557 | template<typename _Ret, typename _Indices, typename... _Tpls> | |
1558 | struct __tuple_concater; | |
1559 | ||
1560 | template<typename _Ret, std::size_t... _Is, typename _Tp, typename... _Tpls> | |
1561 | struct __tuple_concater<_Ret, std::_Index_tuple<_Is...>, _Tp, _Tpls...> | |
1562 | { | |
1563 | template<typename... _Us> | |
9480716c | 1564 | static constexpr _Ret |
ac65b7d2 DK |
1565 | _S_do(_Tp&& __tp, _Tpls&&... __tps, _Us&&... __us) |
1566 | { | |
1567 | typedef typename __make_1st_indices<_Tpls...>::__type __idx; | |
1568 | typedef __tuple_concater<_Ret, __idx, _Tpls...> __next; | |
1569 | return __next::_S_do(std::forward<_Tpls>(__tps)..., | |
1570 | std::forward<_Us>(__us)..., | |
1571 | std::get<_Is>(std::forward<_Tp>(__tp))...); | |
1572 | } | |
1573 | }; | |
1574 | ||
1575 | template<typename _Ret> | |
1576 | struct __tuple_concater<_Ret, std::_Index_tuple<>> | |
1577 | { | |
1578 | template<typename... _Us> | |
9480716c | 1579 | static constexpr _Ret |
ac65b7d2 DK |
1580 | _S_do(_Us&&... __us) |
1581 | { | |
1582 | return _Ret(std::forward<_Us>(__us)...); | |
1583 | } | |
1584 | }; | |
1585 | ||
c0ffa2ba | 1586 | /// tuple_cat |
9480716c DK |
1587 | template<typename... _Tpls, typename = typename |
1588 | enable_if<__and_<__is_tuple_like<_Tpls>...>::value>::type> | |
1589 | constexpr auto | |
ac65b7d2 | 1590 | tuple_cat(_Tpls&&... __tpls) |
9480716c | 1591 | -> typename __tuple_cat_result<_Tpls...>::__type |
ac65b7d2 DK |
1592 | { |
1593 | typedef typename __tuple_cat_result<_Tpls...>::__type __ret; | |
1594 | typedef typename __make_1st_indices<_Tpls...>::__type __idx; | |
1595 | typedef __tuple_concater<__ret, __idx, _Tpls...> __concater; | |
1596 | return __concater::_S_do(std::forward<_Tpls>(__tpls)...); | |
894d0b15 CF |
1597 | } |
1598 | ||
cb2ef49e JW |
1599 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1600 | // 2301. Why is tie not constexpr? | |
c0ffa2ba | 1601 | /// tie |
894d0b15 | 1602 | template<typename... _Elements> |
cb2ef49e | 1603 | constexpr tuple<_Elements&...> |
1aa1114b | 1604 | tie(_Elements&... __args) noexcept |
894d0b15 CF |
1605 | { return tuple<_Elements&...>(__args...); } |
1606 | ||
c0ffa2ba | 1607 | /// swap |
3e93b275 | 1608 | template<typename... _Elements> |
6b9539e2 DK |
1609 | inline |
1610 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 | |
1611 | // Constrained free swap overload, see p0185r1 | |
1612 | typename enable_if<__and_<__is_swappable<_Elements>...>::value | |
1613 | >::type | |
1614 | #else | |
1615 | void | |
1616 | #endif | |
3e93b275 | 1617 | swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y) |
1aa1114b | 1618 | noexcept(noexcept(__x.swap(__y))) |
3e93b275 CF |
1619 | { __x.swap(__y); } |
1620 | ||
a2863bde VV |
1621 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
1622 | template<typename... _Elements> | |
a2863bde VV |
1623 | typename enable_if<!__and_<__is_swappable<_Elements>...>::value>::type |
1624 | swap(tuple<_Elements...>&, tuple<_Elements...>&) = delete; | |
1625 | #endif | |
1626 | ||
894d0b15 | 1627 | // A class (and instance) which can be used in 'tie' when an element |
288695f7 DK |
1628 | // of a tuple is not required. |
1629 | // _GLIBCXX14_CONSTEXPR | |
1630 | // 2933. PR for LWG 2773 could be clearer | |
894d0b15 CF |
1631 | struct _Swallow_assign |
1632 | { | |
1633 | template<class _Tp> | |
288695f7 | 1634 | _GLIBCXX14_CONSTEXPR const _Swallow_assign& |
cff90044 | 1635 | operator=(const _Tp&) const |
894d0b15 CF |
1636 | { return *this; } |
1637 | }; | |
1638 | ||
288695f7 DK |
1639 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1640 | // 2773. Making std::ignore constexpr | |
1641 | _GLIBCXX17_INLINE constexpr _Swallow_assign ignore{}; | |
5e108459 | 1642 | |
b8214660 JW |
1643 | /// Partial specialization for tuples |
1644 | template<typename... _Types, typename _Alloc> | |
1645 | struct uses_allocator<tuple<_Types...>, _Alloc> : true_type { }; | |
1646 | ||
5e108459 PC |
1647 | // See stl_pair.h... |
1648 | template<class _T1, class _T2> | |
62b547b5 JW |
1649 | template<typename... _Args1, typename... _Args2> |
1650 | inline | |
1651 | pair<_T1, _T2>:: | |
1652 | pair(piecewise_construct_t, | |
1653 | tuple<_Args1...> __first, tuple<_Args2...> __second) | |
1654 | : pair(__first, __second, | |
1655 | typename _Build_index_tuple<sizeof...(_Args1)>::__type(), | |
1656 | typename _Build_index_tuple<sizeof...(_Args2)>::__type()) | |
1657 | { } | |
5e108459 PC |
1658 | |
1659 | template<class _T1, class _T2> | |
62b547b5 JW |
1660 | template<typename... _Args1, std::size_t... _Indexes1, |
1661 | typename... _Args2, std::size_t... _Indexes2> | |
1662 | inline | |
1663 | pair<_T1, _T2>:: | |
1664 | pair(tuple<_Args1...>& __tuple1, tuple<_Args2...>& __tuple2, | |
1665 | _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>) | |
1666 | : first(std::forward<_Args1>(std::get<_Indexes1>(__tuple1))...), | |
1667 | second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...) | |
1668 | { } | |
53dc5044 | 1669 | |
3e9f67e6 JW |
1670 | #if __cplusplus > 201402L |
1671 | # define __cpp_lib_apply 201603 | |
1672 | ||
1673 | template <typename _Fn, typename _Tuple, size_t... _Idx> | |
1674 | constexpr decltype(auto) | |
1675 | __apply_impl(_Fn&& __f, _Tuple&& __t, index_sequence<_Idx...>) | |
1676 | { | |
1677 | return std::__invoke(std::forward<_Fn>(__f), | |
1678 | std::get<_Idx>(std::forward<_Tuple>(__t))...); | |
1679 | } | |
1680 | ||
1681 | template <typename _Fn, typename _Tuple> | |
1682 | constexpr decltype(auto) | |
1683 | apply(_Fn&& __f, _Tuple&& __t) | |
1684 | { | |
1685 | using _Indices = make_index_sequence<tuple_size_v<decay_t<_Tuple>>>; | |
285ee2fb JW |
1686 | return std::__apply_impl(std::forward<_Fn>(__f), |
1687 | std::forward<_Tuple>(__t), | |
1688 | _Indices{}); | |
3e9f67e6 | 1689 | } |
ca1ab6be | 1690 | |
24299f65 VV |
1691 | #define __cpp_lib_make_from_tuple 201606 |
1692 | ||
ca1ab6be VV |
1693 | template <typename _Tp, typename _Tuple, size_t... _Idx> |
1694 | constexpr _Tp | |
1695 | __make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>) | |
24299f65 | 1696 | { return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); } |
ca1ab6be VV |
1697 | |
1698 | template <typename _Tp, typename _Tuple> | |
1699 | constexpr _Tp | |
1700 | make_from_tuple(_Tuple&& __t) | |
1701 | { | |
1702 | return __make_from_tuple_impl<_Tp>( | |
1703 | std::forward<_Tuple>(__t), | |
1704 | make_index_sequence<tuple_size_v<decay_t<_Tuple>>>{}); | |
1705 | } | |
3e9f67e6 JW |
1706 | #endif // C++17 |
1707 | ||
c0ffa2ba BK |
1708 | /// @} |
1709 | ||
12ffa228 | 1710 | _GLIBCXX_END_NAMESPACE_VERSION |
c0ffa2ba | 1711 | } // namespace std |
af13a7a6 | 1712 | |
734f5023 | 1713 | #endif // C++11 |
57317d2a | 1714 | |
4514bed6 | 1715 | #endif // _GLIBCXX_TUPLE |