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c0ffa2ba | 1 | // C++11 <type_traits> -*- C++ -*- |
af13a7a6 | 2 | |
99dee823 | 3 | // Copyright (C) 2007-2021 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/type_traits | |
26 | * This is a Standard C++ Library header. | |
27 | */ | |
28 | ||
4514bed6 BK |
29 | #ifndef _GLIBCXX_TYPE_TRAITS |
30 | #define _GLIBCXX_TYPE_TRAITS 1 | |
af13a7a6 BK |
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 | |
8fc81078 | 38 | #include <bits/c++config.h> |
e133ace8 | 39 | |
21e2806a JW |
40 | namespace std _GLIBCXX_VISIBILITY(default) |
41 | { | |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
43 | ||
6963c3b9 JW |
44 | template<typename _Tp> |
45 | class reference_wrapper; | |
46 | ||
8e32aa11 | 47 | /** |
c0ffa2ba | 48 | * @defgroup metaprogramming Metaprogramming |
13901e4b JW |
49 | * @ingroup utilities |
50 | * | |
51 | * Template utilities for compile-time introspection and modification, | |
52 | * including type classification traits, type property inspection traits | |
53 | * and type transformation traits. | |
54 | * | |
6963c3b9 JW |
55 | * @since C++11 |
56 | * | |
5b9daa7e BK |
57 | * @{ |
58 | */ | |
ac65b7d2 DK |
59 | |
60 | /// integral_constant | |
61 | template<typename _Tp, _Tp __v> | |
62 | struct integral_constant | |
63 | { | |
64 | static constexpr _Tp value = __v; | |
65 | typedef _Tp value_type; | |
66 | typedef integral_constant<_Tp, __v> type; | |
352111c5 | 67 | constexpr operator value_type() const noexcept { return value; } |
db113eda | 68 | #if __cplusplus > 201103L |
a15f7cb8 ESR |
69 | |
70 | #define __cpp_lib_integral_constant_callable 201304 | |
71 | ||
352111c5 | 72 | constexpr value_type operator()() const noexcept { return value; } |
db113eda | 73 | #endif |
ac65b7d2 | 74 | }; |
33ac58d5 | 75 | |
a77a46d9 | 76 | #if ! __cpp_inline_variables |
c0ffa2ba BK |
77 | template<typename _Tp, _Tp __v> |
78 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
a77a46d9 | 79 | #endif |
c0ffa2ba | 80 | |
13901e4b | 81 | /// The type used as a compile-time boolean with true value. |
6963c3b9 | 82 | using true_type = integral_constant<bool, true>; |
ac65b7d2 | 83 | |
13901e4b | 84 | /// The type used as a compile-time boolean with false value. |
6963c3b9 | 85 | using false_type = integral_constant<bool, false>; |
ac65b7d2 | 86 | |
6963c3b9 JW |
87 | /// @cond undocumented |
88 | /// bool_constant for C++11 | |
f6b640be JW |
89 | template<bool __v> |
90 | using __bool_constant = integral_constant<bool, __v>; | |
6963c3b9 | 91 | /// @endcond |
f6b640be | 92 | |
6963c3b9 | 93 | #if __cplusplus >= 201703L |
f9badf71 | 94 | # define __cpp_lib_bool_constant 201505 |
6963c3b9 JW |
95 | /// Alias template for compile-time boolean constant types. |
96 | /// @since C++17 | |
46ba1281 JW |
97 | template<bool __v> |
98 | using bool_constant = integral_constant<bool, __v>; | |
99 | #endif | |
100 | ||
6963c3b9 | 101 | // Metaprogramming helper types. |
53dc5044 | 102 | |
a09bb4a8 JW |
103 | template<bool> |
104 | struct __conditional | |
105 | { | |
106 | template<typename _Tp, typename> | |
107 | using type = _Tp; | |
108 | }; | |
109 | ||
110 | template<> | |
111 | struct __conditional<false> | |
112 | { | |
113 | template<typename, typename _Up> | |
114 | using type = _Up; | |
115 | }; | |
116 | ||
117 | // More efficient version of std::conditional_t for internal use (and C++11) | |
118 | template<bool _Cond, typename _If, typename _Else> | |
119 | using __conditional_t | |
120 | = typename __conditional<_Cond>::template type<_If, _Else>; | |
53dc5044 | 121 | |
6963c3b9 | 122 | /// @cond undocumented |
608a080c | 123 | template <typename _Type> |
0d67cd38 JW |
124 | struct __type_identity |
125 | { using type = _Type; }; | |
126 | ||
127 | template<typename _Tp> | |
128 | using __type_identity_t = typename __type_identity<_Tp>::type; | |
608a080c | 129 | |
dd7b175e | 130 | template<typename...> |
123c516a PC |
131 | struct __or_; |
132 | ||
ac65b7d2 DK |
133 | template<> |
134 | struct __or_<> | |
135 | : public false_type | |
136 | { }; | |
137 | ||
dd7b175e PC |
138 | template<typename _B1> |
139 | struct __or_<_B1> | |
140 | : public _B1 | |
141 | { }; | |
142 | ||
123c516a PC |
143 | template<typename _B1, typename _B2> |
144 | struct __or_<_B1, _B2> | |
a09bb4a8 | 145 | : public __conditional_t<_B1::value, _B1, _B2> |
123c516a PC |
146 | { }; |
147 | ||
148 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
149 | struct __or_<_B1, _B2, _B3, _Bn...> | |
a09bb4a8 | 150 | : public __conditional_t<_B1::value, _B1, __or_<_B2, _B3, _Bn...>> |
123c516a | 151 | { }; |
53dc5044 | 152 | |
dd7b175e | 153 | template<typename...> |
123c516a | 154 | struct __and_; |
53dc5044 | 155 | |
ac65b7d2 DK |
156 | template<> |
157 | struct __and_<> | |
158 | : public true_type | |
159 | { }; | |
160 | ||
dd7b175e PC |
161 | template<typename _B1> |
162 | struct __and_<_B1> | |
163 | : public _B1 | |
164 | { }; | |
165 | ||
123c516a PC |
166 | template<typename _B1, typename _B2> |
167 | struct __and_<_B1, _B2> | |
a09bb4a8 | 168 | : public __conditional_t<_B1::value, _B2, _B1> |
123c516a PC |
169 | { }; |
170 | ||
171 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
172 | struct __and_<_B1, _B2, _B3, _Bn...> | |
a09bb4a8 | 173 | : public __conditional_t<_B1::value, __and_<_B2, _B3, _Bn...>, _B1> |
123c516a PC |
174 | { }; |
175 | ||
176 | template<typename _Pp> | |
177 | struct __not_ | |
4b9840f2 | 178 | : public __bool_constant<!bool(_Pp::value)> |
123c516a | 179 | { }; |
6963c3b9 | 180 | /// @endcond |
123c516a | 181 | |
4b9840f2 | 182 | #if __cplusplus >= 201703L |
c3a6648b | 183 | |
6963c3b9 | 184 | /// @cond undocumented |
b655b8fc JW |
185 | template<typename... _Bn> |
186 | inline constexpr bool __or_v = __or_<_Bn...>::value; | |
187 | template<typename... _Bn> | |
188 | inline constexpr bool __and_v = __and_<_Bn...>::value; | |
6963c3b9 | 189 | /// @endcond |
b655b8fc | 190 | |
068c8ac1 | 191 | #define __cpp_lib_logical_traits 201510 |
c3a6648b VV |
192 | |
193 | template<typename... _Bn> | |
194 | struct conjunction | |
195 | : __and_<_Bn...> | |
196 | { }; | |
197 | ||
198 | template<typename... _Bn> | |
199 | struct disjunction | |
200 | : __or_<_Bn...> | |
201 | { }; | |
202 | ||
203 | template<typename _Pp> | |
204 | struct negation | |
205 | : __not_<_Pp> | |
206 | { }; | |
137422c8 | 207 | |
6963c3b9 JW |
208 | /** @ingroup variable_templates |
209 | * @{ | |
210 | */ | |
137422c8 | 211 | template<typename... _Bn> |
4b9840f2 | 212 | inline constexpr bool conjunction_v = conjunction<_Bn...>::value; |
42183d03 | 213 | |
137422c8 | 214 | template<typename... _Bn> |
4b9840f2 | 215 | inline constexpr bool disjunction_v = disjunction<_Bn...>::value; |
42183d03 | 216 | |
137422c8 | 217 | template<typename _Pp> |
4b9840f2 | 218 | inline constexpr bool negation_v = negation<_Pp>::value; |
6963c3b9 | 219 | /// @} |
137422c8 | 220 | |
4b9840f2 | 221 | #endif // C++17 |
c3a6648b | 222 | |
608a080c AP |
223 | // Forward declarations |
224 | template<typename> | |
225 | struct is_reference; | |
226 | template<typename> | |
227 | struct is_function; | |
228 | template<typename> | |
229 | struct is_void; | |
6963c3b9 JW |
230 | template<typename> |
231 | struct remove_cv; | |
232 | template<typename> | |
233 | struct is_const; | |
234 | ||
235 | /// @cond undocumented | |
608a080c AP |
236 | template<typename> |
237 | struct __is_array_unknown_bounds; | |
238 | ||
239 | // Helper functions that return false_type for incomplete classes, | |
240 | // incomplete unions and arrays of known bound from those. | |
241 | ||
070b4df8 JW |
242 | template <typename _Tp, size_t = sizeof(_Tp)> |
243 | constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>) | |
608a080c AP |
244 | { return {}; } |
245 | ||
246 | template <typename _TypeIdentity, | |
247 | typename _NestedType = typename _TypeIdentity::type> | |
248 | constexpr typename __or_< | |
249 | is_reference<_NestedType>, | |
250 | is_function<_NestedType>, | |
251 | is_void<_NestedType>, | |
252 | __is_array_unknown_bounds<_NestedType> | |
253 | >::type __is_complete_or_unbounded(_TypeIdentity) | |
254 | { return {}; } | |
255 | ||
b3618b71 DK |
256 | // For several sfinae-friendly trait implementations we transport both the |
257 | // result information (as the member type) and the failure information (no | |
258 | // member type). This is very similar to std::enable_if, but we cannot use | |
259 | // them, because we need to derive from them as an implementation detail. | |
260 | ||
261 | template<typename _Tp> | |
262 | struct __success_type | |
263 | { typedef _Tp type; }; | |
264 | ||
265 | struct __failure_type | |
266 | { }; | |
267 | ||
391d5d2e JW |
268 | // __remove_cv_t (std::remove_cv_t for C++11). |
269 | template<typename _Tp> | |
270 | using __remove_cv_t = typename remove_cv<_Tp>::type; | |
271 | ||
72459cfd JW |
272 | // Primary type categories. |
273 | ||
53dc5044 PC |
274 | template<typename> |
275 | struct __is_void_helper | |
276 | : public false_type { }; | |
53dc5044 | 277 | |
123c516a PC |
278 | template<> |
279 | struct __is_void_helper<void> | |
280 | : public true_type { }; | |
6963c3b9 | 281 | /// @endcond |
53dc5044 PC |
282 | |
283 | /// is_void | |
284 | template<typename _Tp> | |
285 | struct is_void | |
391d5d2e | 286 | : public __is_void_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
287 | { }; |
288 | ||
6963c3b9 | 289 | /// @cond undocumented |
53dc5044 PC |
290 | template<typename> |
291 | struct __is_integral_helper | |
292 | : public false_type { }; | |
123c516a PC |
293 | |
294 | template<> | |
295 | struct __is_integral_helper<bool> | |
296 | : public true_type { }; | |
33ac58d5 | 297 | |
123c516a PC |
298 | template<> |
299 | struct __is_integral_helper<char> | |
300 | : public true_type { }; | |
301 | ||
302 | template<> | |
303 | struct __is_integral_helper<signed char> | |
304 | : public true_type { }; | |
305 | ||
306 | template<> | |
307 | struct __is_integral_helper<unsigned char> | |
308 | : public true_type { }; | |
309 | ||
29e41848 JW |
310 | // We want is_integral<wchar_t> to be true (and make_signed/unsigned to work) |
311 | // even when libc doesn't provide working <wchar.h> and related functions, | |
312 | // so check __WCHAR_TYPE__ instead of _GLIBCXX_USE_WCHAR_T. | |
313 | #ifdef __WCHAR_TYPE__ | |
123c516a PC |
314 | template<> |
315 | struct __is_integral_helper<wchar_t> | |
316 | : public true_type { }; | |
53dc5044 | 317 | #endif |
123c516a | 318 | |
c124af93 TH |
319 | #ifdef _GLIBCXX_USE_CHAR8_T |
320 | template<> | |
321 | struct __is_integral_helper<char8_t> | |
322 | : public true_type { }; | |
323 | #endif | |
324 | ||
123c516a PC |
325 | template<> |
326 | struct __is_integral_helper<char16_t> | |
327 | : public true_type { }; | |
328 | ||
329 | template<> | |
330 | struct __is_integral_helper<char32_t> | |
331 | : public true_type { }; | |
332 | ||
333 | template<> | |
334 | struct __is_integral_helper<short> | |
335 | : public true_type { }; | |
336 | ||
337 | template<> | |
338 | struct __is_integral_helper<unsigned short> | |
339 | : public true_type { }; | |
340 | ||
341 | template<> | |
342 | struct __is_integral_helper<int> | |
343 | : public true_type { }; | |
344 | ||
345 | template<> | |
346 | struct __is_integral_helper<unsigned int> | |
347 | : public true_type { }; | |
348 | ||
349 | template<> | |
350 | struct __is_integral_helper<long> | |
351 | : public true_type { }; | |
352 | ||
353 | template<> | |
354 | struct __is_integral_helper<unsigned long> | |
355 | : public true_type { }; | |
356 | ||
357 | template<> | |
358 | struct __is_integral_helper<long long> | |
359 | : public true_type { }; | |
360 | ||
361 | template<> | |
362 | struct __is_integral_helper<unsigned long long> | |
363 | : public true_type { }; | |
53dc5044 | 364 | |
78a7c317 DD |
365 | // Conditionalizing on __STRICT_ANSI__ here will break any port that |
366 | // uses one of these types for size_t. | |
367 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
42167831 | 368 | __extension__ |
6d585f01 | 369 | template<> |
78a7c317 | 370 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> |
6d585f01 PC |
371 | : public true_type { }; |
372 | ||
42167831 | 373 | __extension__ |
6d585f01 | 374 | template<> |
78a7c317 DD |
375 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> |
376 | : public true_type { }; | |
377 | #endif | |
378 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 379 | __extension__ |
78a7c317 DD |
380 | template<> |
381 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> | |
382 | : public true_type { }; | |
383 | ||
42167831 | 384 | __extension__ |
78a7c317 DD |
385 | template<> |
386 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> | |
387 | : public true_type { }; | |
388 | #endif | |
389 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 390 | __extension__ |
78a7c317 DD |
391 | template<> |
392 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> | |
393 | : public true_type { }; | |
394 | ||
42167831 | 395 | __extension__ |
78a7c317 DD |
396 | template<> |
397 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> | |
398 | : public true_type { }; | |
399 | #endif | |
400 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 401 | __extension__ |
78a7c317 DD |
402 | template<> |
403 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> | |
404 | : public true_type { }; | |
405 | ||
42167831 | 406 | __extension__ |
78a7c317 DD |
407 | template<> |
408 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> | |
6d585f01 PC |
409 | : public true_type { }; |
410 | #endif | |
6963c3b9 | 411 | /// @endcond |
6d585f01 | 412 | |
53dc5044 PC |
413 | /// is_integral |
414 | template<typename _Tp> | |
415 | struct is_integral | |
391d5d2e | 416 | : public __is_integral_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
417 | { }; |
418 | ||
6963c3b9 | 419 | /// @cond undocumented |
53dc5044 PC |
420 | template<typename> |
421 | struct __is_floating_point_helper | |
422 | : public false_type { }; | |
123c516a PC |
423 | |
424 | template<> | |
425 | struct __is_floating_point_helper<float> | |
426 | : public true_type { }; | |
427 | ||
428 | template<> | |
429 | struct __is_floating_point_helper<double> | |
430 | : public true_type { }; | |
431 | ||
432 | template<> | |
433 | struct __is_floating_point_helper<long double> | |
434 | : public true_type { }; | |
53dc5044 | 435 | |
6d585f01 PC |
436 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
437 | template<> | |
438 | struct __is_floating_point_helper<__float128> | |
439 | : public true_type { }; | |
440 | #endif | |
6963c3b9 | 441 | /// @endcond |
6d585f01 | 442 | |
53dc5044 PC |
443 | /// is_floating_point |
444 | template<typename _Tp> | |
445 | struct is_floating_point | |
391d5d2e | 446 | : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
447 | { }; |
448 | ||
449 | /// is_array | |
450 | template<typename> | |
451 | struct is_array | |
452 | : public false_type { }; | |
453 | ||
454 | template<typename _Tp, std::size_t _Size> | |
455 | struct is_array<_Tp[_Size]> | |
456 | : public true_type { }; | |
457 | ||
458 | template<typename _Tp> | |
459 | struct is_array<_Tp[]> | |
460 | : public true_type { }; | |
461 | ||
462 | template<typename> | |
463 | struct __is_pointer_helper | |
464 | : public false_type { }; | |
123c516a PC |
465 | |
466 | template<typename _Tp> | |
467 | struct __is_pointer_helper<_Tp*> | |
468 | : public true_type { }; | |
53dc5044 PC |
469 | |
470 | /// is_pointer | |
471 | template<typename _Tp> | |
472 | struct is_pointer | |
391d5d2e | 473 | : public __is_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
474 | { }; |
475 | ||
123c516a PC |
476 | /// is_lvalue_reference |
477 | template<typename> | |
478 | struct is_lvalue_reference | |
479 | : public false_type { }; | |
480 | ||
53dc5044 | 481 | template<typename _Tp> |
123c516a PC |
482 | struct is_lvalue_reference<_Tp&> |
483 | : public true_type { }; | |
484 | ||
485 | /// is_rvalue_reference | |
486 | template<typename> | |
487 | struct is_rvalue_reference | |
488 | : public false_type { }; | |
53dc5044 | 489 | |
53dc5044 | 490 | template<typename _Tp> |
123c516a PC |
491 | struct is_rvalue_reference<_Tp&&> |
492 | : public true_type { }; | |
493 | ||
53dc5044 PC |
494 | template<typename> |
495 | struct __is_member_object_pointer_helper | |
496 | : public false_type { }; | |
123c516a PC |
497 | |
498 | template<typename _Tp, typename _Cp> | |
499 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 500 | : public __not_<is_function<_Tp>>::type { }; |
53dc5044 PC |
501 | |
502 | /// is_member_object_pointer | |
503 | template<typename _Tp> | |
504 | struct is_member_object_pointer | |
391d5d2e | 505 | : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
506 | { }; |
507 | ||
508 | template<typename> | |
509 | struct __is_member_function_pointer_helper | |
510 | : public false_type { }; | |
123c516a PC |
511 | |
512 | template<typename _Tp, typename _Cp> | |
513 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 514 | : public is_function<_Tp>::type { }; |
53dc5044 PC |
515 | |
516 | /// is_member_function_pointer | |
517 | template<typename _Tp> | |
518 | struct is_member_function_pointer | |
391d5d2e | 519 | : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
520 | { }; |
521 | ||
522 | /// is_enum | |
523 | template<typename _Tp> | |
524 | struct is_enum | |
525 | : public integral_constant<bool, __is_enum(_Tp)> | |
526 | { }; | |
527 | ||
528 | /// is_union | |
529 | template<typename _Tp> | |
530 | struct is_union | |
531 | : public integral_constant<bool, __is_union(_Tp)> | |
532 | { }; | |
533 | ||
534 | /// is_class | |
535 | template<typename _Tp> | |
536 | struct is_class | |
537 | : public integral_constant<bool, __is_class(_Tp)> | |
538 | { }; | |
539 | ||
540 | /// is_function | |
72459cfd | 541 | template<typename _Tp> |
53dc5044 | 542 | struct is_function |
72459cfd | 543 | : public __bool_constant<!is_const<const _Tp>::value> { }; |
89898034 | 544 | |
72459cfd JW |
545 | template<typename _Tp> |
546 | struct is_function<_Tp&> | |
547 | : public false_type { }; | |
89898034 | 548 | |
72459cfd JW |
549 | template<typename _Tp> |
550 | struct is_function<_Tp&&> | |
551 | : public false_type { }; | |
89898034 | 552 | |
a15f7cb8 ESR |
553 | #define __cpp_lib_is_null_pointer 201309 |
554 | ||
1e673415 | 555 | template<typename> |
aa940ab5 | 556 | struct __is_null_pointer_helper |
1e673415 | 557 | : public false_type { }; |
123c516a PC |
558 | |
559 | template<> | |
aa940ab5 | 560 | struct __is_null_pointer_helper<std::nullptr_t> |
123c516a | 561 | : public true_type { }; |
1e673415 | 562 | |
aa940ab5 PC |
563 | /// is_null_pointer (LWG 2247). |
564 | template<typename _Tp> | |
565 | struct is_null_pointer | |
391d5d2e | 566 | : public __is_null_pointer_helper<__remove_cv_t<_Tp>>::type |
aa940ab5 PC |
567 | { }; |
568 | ||
07fd852f | 569 | /// __is_nullptr_t (deprecated extension). |
aba938d6 | 570 | /// @deprecated Non-standard. Use `is_null_pointer` instead. |
1e673415 PC |
571 | template<typename _Tp> |
572 | struct __is_nullptr_t | |
aa940ab5 | 573 | : public is_null_pointer<_Tp> |
eef9bf4c | 574 | { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer"); |
1e673415 | 575 | |
c0ffa2ba | 576 | // Composite type categories. |
123c516a PC |
577 | |
578 | /// is_reference | |
579 | template<typename _Tp> | |
580 | struct is_reference | |
581 | : public __or_<is_lvalue_reference<_Tp>, | |
582 | is_rvalue_reference<_Tp>>::type | |
583 | { }; | |
584 | ||
53dc5044 PC |
585 | /// is_arithmetic |
586 | template<typename _Tp> | |
587 | struct is_arithmetic | |
123c516a | 588 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
589 | { }; |
590 | ||
591 | /// is_fundamental | |
592 | template<typename _Tp> | |
593 | struct is_fundamental | |
aa940ab5 PC |
594 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, |
595 | is_null_pointer<_Tp>>::type | |
53dc5044 PC |
596 | { }; |
597 | ||
598 | /// is_object | |
599 | template<typename _Tp> | |
600 | struct is_object | |
123c516a PC |
601 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
602 | is_void<_Tp>>>::type | |
53dc5044 PC |
603 | { }; |
604 | ||
123c516a | 605 | template<typename> |
53dc5044 PC |
606 | struct is_member_pointer; |
607 | ||
608 | /// is_scalar | |
609 | template<typename _Tp> | |
610 | struct is_scalar | |
123c516a | 611 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
aa940ab5 | 612 | is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type |
53dc5044 PC |
613 | { }; |
614 | ||
615 | /// is_compound | |
616 | template<typename _Tp> | |
617 | struct is_compound | |
c01f9216 | 618 | : public __not_<is_fundamental<_Tp>>::type { }; |
53dc5044 | 619 | |
6963c3b9 | 620 | /// @cond undocumented |
53dc5044 PC |
621 | template<typename _Tp> |
622 | struct __is_member_pointer_helper | |
623 | : public false_type { }; | |
123c516a PC |
624 | |
625 | template<typename _Tp, typename _Cp> | |
626 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
627 | : public true_type { }; | |
6963c3b9 | 628 | /// @endcond |
53dc5044 | 629 | |
13901e4b | 630 | /// is_member_pointer |
53dc5044 | 631 | template<typename _Tp> |
123c516a | 632 | struct is_member_pointer |
391d5d2e | 633 | : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
634 | { }; |
635 | ||
47f79054 JW |
636 | template<typename, typename> |
637 | struct is_same; | |
638 | ||
6963c3b9 | 639 | /// @cond undocumented |
47f79054 JW |
640 | template<typename _Tp, typename... _Types> |
641 | using __is_one_of = __or_<is_same<_Tp, _Types>...>; | |
642 | ||
643 | // Check if a type is one of the signed integer types. | |
42167831 | 644 | __extension__ |
47f79054 | 645 | template<typename _Tp> |
391d5d2e | 646 | using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
647 | signed char, signed short, signed int, signed long, |
648 | signed long long | |
649 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
650 | , signed __GLIBCXX_TYPE_INT_N_0 | |
651 | #endif | |
652 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
653 | , signed __GLIBCXX_TYPE_INT_N_1 | |
654 | #endif | |
655 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
656 | , signed __GLIBCXX_TYPE_INT_N_2 | |
657 | #endif | |
658 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
659 | , signed __GLIBCXX_TYPE_INT_N_3 | |
660 | #endif | |
661 | >; | |
662 | ||
663 | // Check if a type is one of the unsigned integer types. | |
42167831 | 664 | __extension__ |
47f79054 | 665 | template<typename _Tp> |
391d5d2e | 666 | using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
667 | unsigned char, unsigned short, unsigned int, unsigned long, |
668 | unsigned long long | |
669 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
670 | , unsigned __GLIBCXX_TYPE_INT_N_0 | |
671 | #endif | |
672 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
673 | , unsigned __GLIBCXX_TYPE_INT_N_1 | |
674 | #endif | |
675 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
676 | , unsigned __GLIBCXX_TYPE_INT_N_2 | |
677 | #endif | |
678 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
679 | , unsigned __GLIBCXX_TYPE_INT_N_3 | |
680 | #endif | |
681 | >; | |
682 | ||
98cf2c26 JW |
683 | // Check if a type is one of the signed or unsigned integer types. |
684 | template<typename _Tp> | |
685 | using __is_standard_integer | |
686 | = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>; | |
47f79054 | 687 | |
72459cfd JW |
688 | // __void_t (std::void_t for C++11) |
689 | template<typename...> using __void_t = void; | |
690 | ||
89898034 DK |
691 | // Utility to detect referenceable types ([defns.referenceable]). |
692 | ||
72459cfd | 693 | template<typename _Tp, typename = void> |
89898034 | 694 | struct __is_referenceable |
72459cfd | 695 | : public false_type |
89898034 DK |
696 | { }; |
697 | ||
72459cfd JW |
698 | template<typename _Tp> |
699 | struct __is_referenceable<_Tp, __void_t<_Tp&>> | |
89898034 DK |
700 | : public true_type |
701 | { }; | |
6963c3b9 | 702 | /// @endcond |
89898034 | 703 | |
c0ffa2ba | 704 | // Type properties. |
123c516a | 705 | |
53dc5044 PC |
706 | /// is_const |
707 | template<typename> | |
708 | struct is_const | |
709 | : public false_type { }; | |
710 | ||
711 | template<typename _Tp> | |
712 | struct is_const<_Tp const> | |
713 | : public true_type { }; | |
33ac58d5 | 714 | |
53dc5044 PC |
715 | /// is_volatile |
716 | template<typename> | |
717 | struct is_volatile | |
718 | : public false_type { }; | |
719 | ||
720 | template<typename _Tp> | |
721 | struct is_volatile<_Tp volatile> | |
722 | : public true_type { }; | |
723 | ||
123c516a PC |
724 | /// is_trivial |
725 | template<typename _Tp> | |
726 | struct is_trivial | |
727 | : public integral_constant<bool, __is_trivial(_Tp)> | |
608a080c AP |
728 | { |
729 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
730 | "template argument must be a complete class or an unbounded array"); | |
731 | }; | |
123c516a | 732 | |
6963c3b9 | 733 | /// is_trivially_copyable |
f5e523b7 VV |
734 | template<typename _Tp> |
735 | struct is_trivially_copyable | |
736 | : public integral_constant<bool, __is_trivially_copyable(_Tp)> | |
608a080c AP |
737 | { |
738 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
739 | "template argument must be a complete class or an unbounded array"); | |
740 | }; | |
123c516a PC |
741 | |
742 | /// is_standard_layout | |
743 | template<typename _Tp> | |
744 | struct is_standard_layout | |
745 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
608a080c AP |
746 | { |
747 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
748 | "template argument must be a complete class or an unbounded array"); | |
749 | }; | |
123c516a | 750 | |
aba938d6 JW |
751 | /** is_pod |
752 | * @deprecated Deprecated in C++20. | |
753 | * Use `is_standard_layout && is_trivial` instead. | |
6963c3b9 | 754 | */ |
123c516a PC |
755 | // Could use is_standard_layout && is_trivial instead of the builtin. |
756 | template<typename _Tp> | |
1a6c5064 JTM |
757 | struct |
758 | _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead") | |
759 | is_pod | |
123c516a | 760 | : public integral_constant<bool, __is_pod(_Tp)> |
608a080c AP |
761 | { |
762 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
763 | "template argument must be a complete class or an unbounded array"); | |
764 | }; | |
123c516a | 765 | |
6963c3b9 | 766 | /** is_literal_type |
aba938d6 JW |
767 | * @deprecated Deprecated in C++17, removed in C++20. |
768 | * The idea of a literal type isn't useful. | |
6963c3b9 | 769 | */ |
123c516a | 770 | template<typename _Tp> |
24b54628 VV |
771 | struct |
772 | _GLIBCXX17_DEPRECATED | |
773 | is_literal_type | |
123c516a | 774 | : public integral_constant<bool, __is_literal_type(_Tp)> |
608a080c AP |
775 | { |
776 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
777 | "template argument must be a complete class or an unbounded array"); | |
778 | }; | |
123c516a | 779 | |
53dc5044 PC |
780 | /// is_empty |
781 | template<typename _Tp> | |
782 | struct is_empty | |
783 | : public integral_constant<bool, __is_empty(_Tp)> | |
209ee624 | 784 | { }; |
53dc5044 PC |
785 | |
786 | /// is_polymorphic | |
787 | template<typename _Tp> | |
788 | struct is_polymorphic | |
789 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
209ee624 | 790 | { }; |
53dc5044 | 791 | |
4db7fcb9 ESR |
792 | #if __cplusplus >= 201402L |
793 | #define __cpp_lib_is_final 201402L | |
794 | /// is_final | |
6963c3b9 | 795 | /// @since C++14 |
4db7fcb9 ESR |
796 | template<typename _Tp> |
797 | struct is_final | |
798 | : public integral_constant<bool, __is_final(_Tp)> | |
209ee624 | 799 | { }; |
4db7fcb9 ESR |
800 | #endif |
801 | ||
53dc5044 PC |
802 | /// is_abstract |
803 | template<typename _Tp> | |
804 | struct is_abstract | |
805 | : public integral_constant<bool, __is_abstract(_Tp)> | |
209ee624 | 806 | { }; |
53dc5044 | 807 | |
6963c3b9 | 808 | /// @cond undocumented |
123c516a | 809 | template<typename _Tp, |
6a4b1a00 | 810 | bool = is_arithmetic<_Tp>::value> |
123c516a PC |
811 | struct __is_signed_helper |
812 | : public false_type { }; | |
813 | ||
53dc5044 | 814 | template<typename _Tp> |
6a4b1a00 PC |
815 | struct __is_signed_helper<_Tp, true> |
816 | : public integral_constant<bool, _Tp(-1) < _Tp(0)> | |
53dc5044 | 817 | { }; |
6963c3b9 | 818 | /// @endcond |
53dc5044 | 819 | |
123c516a | 820 | /// is_signed |
53dc5044 | 821 | template<typename _Tp> |
123c516a | 822 | struct is_signed |
82b12c4b | 823 | : public __is_signed_helper<_Tp>::type |
123c516a PC |
824 | { }; |
825 | ||
826 | /// is_unsigned | |
827 | template<typename _Tp> | |
828 | struct is_unsigned | |
f7632193 | 829 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>> |
123c516a PC |
830 | { }; |
831 | ||
6963c3b9 | 832 | /// @cond undocumented |
ec26ff5a JW |
833 | template<typename _Tp, typename _Up = _Tp&&> |
834 | _Up | |
835 | __declval(int); | |
836 | ||
837 | template<typename _Tp> | |
838 | _Tp | |
839 | __declval(long); | |
6963c3b9 | 840 | /// @endcond |
ec26ff5a | 841 | |
53dc5044 | 842 | template<typename _Tp> |
ec26ff5a | 843 | auto declval() noexcept -> decltype(__declval<_Tp>(0)); |
53dc5044 | 844 | |
123c516a PC |
845 | template<typename, unsigned = 0> |
846 | struct extent; | |
847 | ||
848 | template<typename> | |
849 | struct remove_all_extents; | |
850 | ||
6963c3b9 | 851 | /// @cond undocumented |
123c516a PC |
852 | template<typename _Tp> |
853 | struct __is_array_known_bounds | |
854 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
855 | { }; |
856 | ||
123c516a PC |
857 | template<typename _Tp> |
858 | struct __is_array_unknown_bounds | |
f7632193 | 859 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>> |
53dc5044 | 860 | { }; |
33ac58d5 | 861 | |
6963c3b9 JW |
862 | // Destructible and constructible type properties. |
863 | ||
62fa805f | 864 | // In N3290 is_destructible does not say anything about function |
2c7a09d7 | 865 | // types and abstract types, see LWG 2049. This implementation |
62fa805f DK |
866 | // describes function types as non-destructible and all complete |
867 | // object types as destructible, iff the explicit destructor | |
2c7a09d7 | 868 | // call expression is wellformed. |
62fa805f | 869 | struct __do_is_destructible_impl |
123c516a | 870 | { |
62fa805f | 871 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
123c516a PC |
872 | static true_type __test(int); |
873 | ||
874 | template<typename> | |
875 | static false_type __test(...); | |
876 | }; | |
53dc5044 PC |
877 | |
878 | template<typename _Tp> | |
62fa805f DK |
879 | struct __is_destructible_impl |
880 | : public __do_is_destructible_impl | |
123c516a PC |
881 | { |
882 | typedef decltype(__test<_Tp>(0)) type; | |
883 | }; | |
53dc5044 | 884 | |
62fa805f DK |
885 | template<typename _Tp, |
886 | bool = __or_<is_void<_Tp>, | |
887 | __is_array_unknown_bounds<_Tp>, | |
888 | is_function<_Tp>>::value, | |
889 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
890 | struct __is_destructible_safe; | |
891 | ||
892 | template<typename _Tp> | |
893 | struct __is_destructible_safe<_Tp, false, false> | |
894 | : public __is_destructible_impl<typename | |
895 | remove_all_extents<_Tp>::type>::type | |
896 | { }; | |
897 | ||
898 | template<typename _Tp> | |
899 | struct __is_destructible_safe<_Tp, true, false> | |
900 | : public false_type { }; | |
901 | ||
902 | template<typename _Tp> | |
903 | struct __is_destructible_safe<_Tp, false, true> | |
904 | : public true_type { }; | |
6963c3b9 | 905 | /// @endcond |
62fa805f DK |
906 | |
907 | /// is_destructible | |
908 | template<typename _Tp> | |
909 | struct is_destructible | |
82b12c4b | 910 | : public __is_destructible_safe<_Tp>::type |
608a080c AP |
911 | { |
912 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
913 | "template argument must be a complete class or an unbounded array"); | |
914 | }; | |
62fa805f | 915 | |
6963c3b9 JW |
916 | /// @cond undocumented |
917 | ||
62fa805f DK |
918 | // is_nothrow_destructible requires that is_destructible is |
919 | // satisfied as well. We realize that by mimicing the | |
920 | // implementation of is_destructible but refer to noexcept(expr) | |
921 | // instead of decltype(expr). | |
922 | struct __do_is_nt_destructible_impl | |
123c516a | 923 | { |
62fa805f | 924 | template<typename _Tp> |
c01f9216 JW |
925 | static __bool_constant<noexcept(declval<_Tp&>().~_Tp())> |
926 | __test(int); | |
123c516a PC |
927 | |
928 | template<typename> | |
929 | static false_type __test(...); | |
930 | }; | |
53dc5044 | 931 | |
53dc5044 | 932 | template<typename _Tp> |
62fa805f DK |
933 | struct __is_nt_destructible_impl |
934 | : public __do_is_nt_destructible_impl | |
123c516a PC |
935 | { |
936 | typedef decltype(__test<_Tp>(0)) type; | |
937 | }; | |
938 | ||
939 | template<typename _Tp, | |
940 | bool = __or_<is_void<_Tp>, | |
62fa805f DK |
941 | __is_array_unknown_bounds<_Tp>, |
942 | is_function<_Tp>>::value, | |
943 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
944 | struct __is_nt_destructible_safe; | |
53dc5044 PC |
945 | |
946 | template<typename _Tp> | |
62fa805f DK |
947 | struct __is_nt_destructible_safe<_Tp, false, false> |
948 | : public __is_nt_destructible_impl<typename | |
949 | remove_all_extents<_Tp>::type>::type | |
123c516a PC |
950 | { }; |
951 | ||
53dc5044 | 952 | template<typename _Tp> |
62fa805f | 953 | struct __is_nt_destructible_safe<_Tp, true, false> |
123c516a | 954 | : public false_type { }; |
53dc5044 PC |
955 | |
956 | template<typename _Tp> | |
62fa805f | 957 | struct __is_nt_destructible_safe<_Tp, false, true> |
123c516a | 958 | : public true_type { }; |
6963c3b9 | 959 | /// @endcond |
123c516a | 960 | |
62fa805f | 961 | /// is_nothrow_destructible |
53dc5044 | 962 | template<typename _Tp> |
62fa805f | 963 | struct is_nothrow_destructible |
82b12c4b | 964 | : public __is_nt_destructible_safe<_Tp>::type |
608a080c AP |
965 | { |
966 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
967 | "template argument must be a complete class or an unbounded array"); | |
968 | }; | |
969 | ||
6963c3b9 | 970 | /// @cond undocumented |
608a080c AP |
971 | template<typename _Tp, typename... _Args> |
972 | struct __is_constructible_impl | |
973 | : public __bool_constant<__is_constructible(_Tp, _Args...)> | |
123c516a | 974 | { }; |
6963c3b9 | 975 | /// @endcond |
123c516a | 976 | |
58487c21 JW |
977 | /// is_constructible |
978 | template<typename _Tp, typename... _Args> | |
979 | struct is_constructible | |
608a080c AP |
980 | : public __is_constructible_impl<_Tp, _Args...> |
981 | { | |
982 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
983 | "template argument must be a complete class or an unbounded array"); | |
984 | }; | |
4a27a739 | 985 | |
123c516a | 986 | /// is_default_constructible |
4a27a739 | 987 | template<typename _Tp> |
123c516a | 988 | struct is_default_constructible |
608a080c AP |
989 | : public __is_constructible_impl<_Tp>::type |
990 | { | |
991 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
992 | "template argument must be a complete class or an unbounded array"); | |
993 | }; | |
c32097d8 | 994 | |
6963c3b9 | 995 | /// @cond undocumented |
89898034 | 996 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd | 997 | struct __is_copy_constructible_impl; |
123c516a | 998 | |
65cee9bd | 999 | template<typename _Tp> |
89898034 | 1000 | struct __is_copy_constructible_impl<_Tp, false> |
65cee9bd PC |
1001 | : public false_type { }; |
1002 | ||
1003 | template<typename _Tp> | |
89898034 | 1004 | struct __is_copy_constructible_impl<_Tp, true> |
608a080c | 1005 | : public __is_constructible_impl<_Tp, const _Tp&> |
65cee9bd | 1006 | { }; |
6963c3b9 | 1007 | /// @endcond |
65cee9bd PC |
1008 | |
1009 | /// is_copy_constructible | |
1010 | template<typename _Tp> | |
1011 | struct is_copy_constructible | |
1012 | : public __is_copy_constructible_impl<_Tp> | |
608a080c AP |
1013 | { |
1014 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1015 | "template argument must be a complete class or an unbounded array"); | |
1016 | }; | |
65cee9bd | 1017 | |
6963c3b9 | 1018 | /// @cond undocumented |
89898034 | 1019 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1020 | struct __is_move_constructible_impl; |
1021 | ||
1022 | template<typename _Tp> | |
89898034 | 1023 | struct __is_move_constructible_impl<_Tp, false> |
65cee9bd PC |
1024 | : public false_type { }; |
1025 | ||
1026 | template<typename _Tp> | |
89898034 | 1027 | struct __is_move_constructible_impl<_Tp, true> |
608a080c | 1028 | : public __is_constructible_impl<_Tp, _Tp&&> |
65cee9bd | 1029 | { }; |
6963c3b9 | 1030 | /// @endcond |
65cee9bd PC |
1031 | |
1032 | /// is_move_constructible | |
1033 | template<typename _Tp> | |
1034 | struct is_move_constructible | |
1035 | : public __is_move_constructible_impl<_Tp> | |
608a080c AP |
1036 | { |
1037 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1038 | "template argument must be a complete class or an unbounded array"); | |
1039 | }; | |
65cee9bd | 1040 | |
6963c3b9 | 1041 | /// @cond undocumented |
b3341826 JW |
1042 | template<typename _Tp, typename... _Args> |
1043 | using __is_nothrow_constructible_impl | |
9e2256dc | 1044 | = __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>; |
6963c3b9 | 1045 | /// @endcond |
b3341826 | 1046 | |
608a080c AP |
1047 | /// is_nothrow_constructible |
1048 | template<typename _Tp, typename... _Args> | |
1049 | struct is_nothrow_constructible | |
1050 | : public __is_nothrow_constructible_impl<_Tp, _Args...>::type | |
1051 | { | |
1052 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1053 | "template argument must be a complete class or an unbounded array"); | |
1054 | }; | |
1055 | ||
b3341826 JW |
1056 | /// is_nothrow_default_constructible |
1057 | template<typename _Tp> | |
1058 | struct is_nothrow_default_constructible | |
9e2256dc | 1059 | : public __bool_constant<__is_nothrow_constructible(_Tp)> |
b3341826 JW |
1060 | { |
1061 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1062 | "template argument must be a complete class or an unbounded array"); | |
1063 | }; | |
1064 | ||
6963c3b9 | 1065 | /// @cond undocumented |
89898034 | 1066 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1067 | struct __is_nothrow_copy_constructible_impl; |
1068 | ||
1069 | template<typename _Tp> | |
89898034 | 1070 | struct __is_nothrow_copy_constructible_impl<_Tp, false> |
65cee9bd PC |
1071 | : public false_type { }; |
1072 | ||
1073 | template<typename _Tp> | |
89898034 | 1074 | struct __is_nothrow_copy_constructible_impl<_Tp, true> |
608a080c | 1075 | : public __is_nothrow_constructible_impl<_Tp, const _Tp&> |
65cee9bd | 1076 | { }; |
6963c3b9 | 1077 | /// @endcond |
65cee9bd PC |
1078 | |
1079 | /// is_nothrow_copy_constructible | |
1080 | template<typename _Tp> | |
1081 | struct is_nothrow_copy_constructible | |
608a080c AP |
1082 | : public __is_nothrow_copy_constructible_impl<_Tp>::type |
1083 | { | |
1084 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1085 | "template argument must be a complete class or an unbounded array"); | |
1086 | }; | |
65cee9bd | 1087 | |
6963c3b9 | 1088 | /// @cond undocumented |
89898034 | 1089 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1090 | struct __is_nothrow_move_constructible_impl; |
1091 | ||
1092 | template<typename _Tp> | |
89898034 | 1093 | struct __is_nothrow_move_constructible_impl<_Tp, false> |
65cee9bd PC |
1094 | : public false_type { }; |
1095 | ||
1096 | template<typename _Tp> | |
89898034 | 1097 | struct __is_nothrow_move_constructible_impl<_Tp, true> |
608a080c | 1098 | : public __is_nothrow_constructible_impl<_Tp, _Tp&&> |
65cee9bd | 1099 | { }; |
6963c3b9 | 1100 | /// @endcond |
65cee9bd PC |
1101 | |
1102 | /// is_nothrow_move_constructible | |
1103 | template<typename _Tp> | |
1104 | struct is_nothrow_move_constructible | |
608a080c AP |
1105 | : public __is_nothrow_move_constructible_impl<_Tp>::type |
1106 | { | |
1107 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1108 | "template argument must be a complete class or an unbounded array"); | |
1109 | }; | |
65cee9bd | 1110 | |
f263981a PC |
1111 | /// is_assignable |
1112 | template<typename _Tp, typename _Up> | |
1113 | struct is_assignable | |
608a080c AP |
1114 | : public __bool_constant<__is_assignable(_Tp, _Up)> |
1115 | { | |
1116 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1117 | "template argument must be a complete class or an unbounded array"); | |
1118 | }; | |
f263981a | 1119 | |
89898034 | 1120 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1121 | struct __is_copy_assignable_impl; |
1122 | ||
1123 | template<typename _Tp> | |
89898034 | 1124 | struct __is_copy_assignable_impl<_Tp, false> |
f263981a PC |
1125 | : public false_type { }; |
1126 | ||
1127 | template<typename _Tp> | |
89898034 | 1128 | struct __is_copy_assignable_impl<_Tp, true> |
608a080c | 1129 | : public __bool_constant<__is_assignable(_Tp&, const _Tp&)> |
f263981a PC |
1130 | { }; |
1131 | ||
1132 | /// is_copy_assignable | |
1133 | template<typename _Tp> | |
1134 | struct is_copy_assignable | |
608a080c AP |
1135 | : public __is_copy_assignable_impl<_Tp>::type |
1136 | { | |
1137 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1138 | "template argument must be a complete class or an unbounded array"); | |
1139 | }; | |
f263981a | 1140 | |
89898034 | 1141 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1142 | struct __is_move_assignable_impl; |
1143 | ||
1144 | template<typename _Tp> | |
89898034 | 1145 | struct __is_move_assignable_impl<_Tp, false> |
f263981a PC |
1146 | : public false_type { }; |
1147 | ||
1148 | template<typename _Tp> | |
89898034 | 1149 | struct __is_move_assignable_impl<_Tp, true> |
608a080c | 1150 | : public __bool_constant<__is_assignable(_Tp&, _Tp&&)> |
f263981a PC |
1151 | { }; |
1152 | ||
1153 | /// is_move_assignable | |
1154 | template<typename _Tp> | |
1155 | struct is_move_assignable | |
608a080c AP |
1156 | : public __is_move_assignable_impl<_Tp>::type |
1157 | { | |
1158 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1159 | "template argument must be a complete class or an unbounded array"); | |
1160 | }; | |
f263981a PC |
1161 | |
1162 | template<typename _Tp, typename _Up> | |
9e2256dc VV |
1163 | using __is_nothrow_assignable_impl |
1164 | = __bool_constant<__is_nothrow_assignable(_Tp, _Up)>; | |
f263981a | 1165 | |
608a080c AP |
1166 | /// is_nothrow_assignable |
1167 | template<typename _Tp, typename _Up> | |
1168 | struct is_nothrow_assignable | |
1169 | : public __is_nothrow_assignable_impl<_Tp, _Up> | |
1170 | { | |
1171 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1172 | "template argument must be a complete class or an unbounded array"); | |
1173 | }; | |
1174 | ||
89898034 | 1175 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1176 | struct __is_nt_copy_assignable_impl; |
1177 | ||
1178 | template<typename _Tp> | |
89898034 | 1179 | struct __is_nt_copy_assignable_impl<_Tp, false> |
f263981a PC |
1180 | : public false_type { }; |
1181 | ||
1182 | template<typename _Tp> | |
89898034 | 1183 | struct __is_nt_copy_assignable_impl<_Tp, true> |
608a080c | 1184 | : public __is_nothrow_assignable_impl<_Tp&, const _Tp&> |
f263981a PC |
1185 | { }; |
1186 | ||
1187 | /// is_nothrow_copy_assignable | |
1188 | template<typename _Tp> | |
1189 | struct is_nothrow_copy_assignable | |
1190 | : public __is_nt_copy_assignable_impl<_Tp> | |
608a080c AP |
1191 | { |
1192 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1193 | "template argument must be a complete class or an unbounded array"); | |
1194 | }; | |
f263981a | 1195 | |
89898034 | 1196 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1197 | struct __is_nt_move_assignable_impl; |
1198 | ||
1199 | template<typename _Tp> | |
89898034 | 1200 | struct __is_nt_move_assignable_impl<_Tp, false> |
f263981a PC |
1201 | : public false_type { }; |
1202 | ||
1203 | template<typename _Tp> | |
89898034 | 1204 | struct __is_nt_move_assignable_impl<_Tp, true> |
608a080c | 1205 | : public __is_nothrow_assignable_impl<_Tp&, _Tp&&> |
f263981a PC |
1206 | { }; |
1207 | ||
1208 | /// is_nothrow_move_assignable | |
65cee9bd | 1209 | template<typename _Tp> |
f263981a PC |
1210 | struct is_nothrow_move_assignable |
1211 | : public __is_nt_move_assignable_impl<_Tp> | |
608a080c AP |
1212 | { |
1213 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1214 | "template argument must be a complete class or an unbounded array"); | |
1215 | }; | |
e4f32cb0 | 1216 | |
f5e523b7 VV |
1217 | /// is_trivially_constructible |
1218 | template<typename _Tp, typename... _Args> | |
1219 | struct is_trivially_constructible | |
c01f9216 | 1220 | : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)> |
608a080c AP |
1221 | { |
1222 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1223 | "template argument must be a complete class or an unbounded array"); | |
1224 | }; | |
33ac58d5 | 1225 | |
f5e523b7 VV |
1226 | /// is_trivially_default_constructible |
1227 | template<typename _Tp> | |
1228 | struct is_trivially_default_constructible | |
608a080c AP |
1229 | : public __bool_constant<__is_trivially_constructible(_Tp)> |
1230 | { | |
1231 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1232 | "template argument must be a complete class or an unbounded array"); | |
1233 | }; | |
6a9ecd34 | 1234 | |
f7632193 VV |
1235 | struct __do_is_implicitly_default_constructible_impl |
1236 | { | |
1237 | template <typename _Tp> | |
1238 | static void __helper(const _Tp&); | |
1239 | ||
1240 | template <typename _Tp> | |
1241 | static true_type __test(const _Tp&, | |
1242 | decltype(__helper<const _Tp&>({}))* = 0); | |
1243 | ||
1244 | static false_type __test(...); | |
1245 | }; | |
1246 | ||
1247 | template<typename _Tp> | |
1248 | struct __is_implicitly_default_constructible_impl | |
e9029d55 JW |
1249 | : public __do_is_implicitly_default_constructible_impl |
1250 | { | |
1251 | typedef decltype(__test(declval<_Tp>())) type; | |
1252 | }; | |
f7632193 VV |
1253 | |
1254 | template<typename _Tp> | |
1255 | struct __is_implicitly_default_constructible_safe | |
e9029d55 JW |
1256 | : public __is_implicitly_default_constructible_impl<_Tp>::type |
1257 | { }; | |
f7632193 VV |
1258 | |
1259 | template <typename _Tp> | |
1260 | struct __is_implicitly_default_constructible | |
608a080c | 1261 | : public __and_<__is_constructible_impl<_Tp>, |
e9029d55 JW |
1262 | __is_implicitly_default_constructible_safe<_Tp>> |
1263 | { }; | |
f7632193 | 1264 | |
b42cc3ca VV |
1265 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
1266 | struct __is_trivially_copy_constructible_impl; | |
1267 | ||
f5e523b7 | 1268 | template<typename _Tp> |
b42cc3ca VV |
1269 | struct __is_trivially_copy_constructible_impl<_Tp, false> |
1270 | : public false_type { }; | |
1271 | ||
1272 | template<typename _Tp> | |
1273 | struct __is_trivially_copy_constructible_impl<_Tp, true> | |
608a080c | 1274 | : public __and_<__is_copy_constructible_impl<_Tp>, |
f5e523b7 | 1275 | integral_constant<bool, |
f7632193 | 1276 | __is_trivially_constructible(_Tp, const _Tp&)>> |
f5e523b7 | 1277 | { }; |
33ac58d5 | 1278 | |
608a080c | 1279 | /// is_trivially_copy_constructible |
b42cc3ca VV |
1280 | template<typename _Tp> |
1281 | struct is_trivially_copy_constructible | |
1282 | : public __is_trivially_copy_constructible_impl<_Tp> | |
608a080c AP |
1283 | { |
1284 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1285 | "template argument must be a complete class or an unbounded array"); | |
1286 | }; | |
b42cc3ca VV |
1287 | |
1288 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> | |
1289 | struct __is_trivially_move_constructible_impl; | |
1290 | ||
f5e523b7 | 1291 | template<typename _Tp> |
b42cc3ca VV |
1292 | struct __is_trivially_move_constructible_impl<_Tp, false> |
1293 | : public false_type { }; | |
1294 | ||
1295 | template<typename _Tp> | |
1296 | struct __is_trivially_move_constructible_impl<_Tp, true> | |
608a080c | 1297 | : public __and_<__is_move_constructible_impl<_Tp>, |
f5e523b7 | 1298 | integral_constant<bool, |
f7632193 | 1299 | __is_trivially_constructible(_Tp, _Tp&&)>> |
f5e523b7 | 1300 | { }; |
6a9ecd34 | 1301 | |
608a080c | 1302 | /// is_trivially_move_constructible |
b42cc3ca VV |
1303 | template<typename _Tp> |
1304 | struct is_trivially_move_constructible | |
1305 | : public __is_trivially_move_constructible_impl<_Tp> | |
608a080c AP |
1306 | { |
1307 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1308 | "template argument must be a complete class or an unbounded array"); | |
1309 | }; | |
b42cc3ca | 1310 | |
f5e523b7 VV |
1311 | /// is_trivially_assignable |
1312 | template<typename _Tp, typename _Up> | |
1313 | struct is_trivially_assignable | |
b42cc3ca | 1314 | : public __bool_constant<__is_trivially_assignable(_Tp, _Up)> |
608a080c AP |
1315 | { |
1316 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1317 | "template argument must be a complete class or an unbounded array"); | |
1318 | }; | |
b42cc3ca VV |
1319 | |
1320 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> | |
1321 | struct __is_trivially_copy_assignable_impl; | |
1322 | ||
f5e523b7 | 1323 | template<typename _Tp> |
b42cc3ca VV |
1324 | struct __is_trivially_copy_assignable_impl<_Tp, false> |
1325 | : public false_type { }; | |
1326 | ||
1327 | template<typename _Tp> | |
1328 | struct __is_trivially_copy_assignable_impl<_Tp, true> | |
c01f9216 | 1329 | : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)> |
f5e523b7 | 1330 | { }; |
6a9ecd34 | 1331 | |
608a080c | 1332 | /// is_trivially_copy_assignable |
b42cc3ca VV |
1333 | template<typename _Tp> |
1334 | struct is_trivially_copy_assignable | |
1335 | : public __is_trivially_copy_assignable_impl<_Tp> | |
608a080c AP |
1336 | { |
1337 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1338 | "template argument must be a complete class or an unbounded array"); | |
1339 | }; | |
b42cc3ca VV |
1340 | |
1341 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> | |
1342 | struct __is_trivially_move_assignable_impl; | |
1343 | ||
f5e523b7 | 1344 | template<typename _Tp> |
b42cc3ca VV |
1345 | struct __is_trivially_move_assignable_impl<_Tp, false> |
1346 | : public false_type { }; | |
1347 | ||
1348 | template<typename _Tp> | |
1349 | struct __is_trivially_move_assignable_impl<_Tp, true> | |
c01f9216 | 1350 | : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)> |
f5e523b7 | 1351 | { }; |
6a9ecd34 | 1352 | |
608a080c | 1353 | /// is_trivially_move_assignable |
b42cc3ca VV |
1354 | template<typename _Tp> |
1355 | struct is_trivially_move_assignable | |
1356 | : public __is_trivially_move_assignable_impl<_Tp> | |
608a080c AP |
1357 | { |
1358 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1359 | "template argument must be a complete class or an unbounded array"); | |
1360 | }; | |
b42cc3ca | 1361 | |
6a9ecd34 PC |
1362 | /// is_trivially_destructible |
1363 | template<typename _Tp> | |
1364 | struct is_trivially_destructible | |
608a080c | 1365 | : public __and_<__is_destructible_safe<_Tp>, |
c01f9216 | 1366 | __bool_constant<__has_trivial_destructor(_Tp)>> |
608a080c AP |
1367 | { |
1368 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1369 | "template argument must be a complete class or an unbounded array"); | |
1370 | }; | |
6a9ecd34 | 1371 | |
e133ace8 | 1372 | |
123c516a PC |
1373 | /// has_virtual_destructor |
1374 | template<typename _Tp> | |
1375 | struct has_virtual_destructor | |
1376 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
608a080c AP |
1377 | { |
1378 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1379 | "template argument must be a complete class or an unbounded array"); | |
1380 | }; | |
123c516a | 1381 | |
33ac58d5 | 1382 | |
123c516a PC |
1383 | // type property queries. |
1384 | ||
1385 | /// alignment_of | |
1386 | template<typename _Tp> | |
1387 | struct alignment_of | |
608a080c AP |
1388 | : public integral_constant<std::size_t, alignof(_Tp)> |
1389 | { | |
1390 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1391 | "template argument must be a complete class or an unbounded array"); | |
1392 | }; | |
33ac58d5 | 1393 | |
123c516a PC |
1394 | /// rank |
1395 | template<typename> | |
1396 | struct rank | |
1397 | : public integral_constant<std::size_t, 0> { }; | |
33ac58d5 | 1398 | |
123c516a PC |
1399 | template<typename _Tp, std::size_t _Size> |
1400 | struct rank<_Tp[_Size]> | |
1401 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1402 | ||
1403 | template<typename _Tp> | |
1404 | struct rank<_Tp[]> | |
1405 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1406 | ||
1407 | /// extent | |
1408 | template<typename, unsigned _Uint> | |
1409 | struct extent | |
1410 | : public integral_constant<std::size_t, 0> { }; | |
33ac58d5 | 1411 | |
123c516a PC |
1412 | template<typename _Tp, unsigned _Uint, std::size_t _Size> |
1413 | struct extent<_Tp[_Size], _Uint> | |
1414 | : public integral_constant<std::size_t, | |
1415 | _Uint == 0 ? _Size : extent<_Tp, | |
1416 | _Uint - 1>::value> | |
1417 | { }; | |
1418 | ||
1419 | template<typename _Tp, unsigned _Uint> | |
1420 | struct extent<_Tp[], _Uint> | |
1421 | : public integral_constant<std::size_t, | |
1422 | _Uint == 0 ? 0 : extent<_Tp, | |
1423 | _Uint - 1>::value> | |
1424 | { }; | |
1425 | ||
1426 | ||
c0ffa2ba | 1427 | // Type relations. |
123c516a PC |
1428 | |
1429 | /// is_same | |
02f6fdff | 1430 | template<typename _Tp, typename _Up> |
123c516a | 1431 | struct is_same |
73ae6eb5 JW |
1432 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
1433 | : public integral_constant<bool, __is_same(_Tp, _Up)> | |
44af818f JW |
1434 | #else |
1435 | : public false_type | |
1436 | #endif | |
02f6fdff | 1437 | { }; |
b0302c68 | 1438 | |
73ae6eb5 | 1439 | #ifndef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
44af818f JW |
1440 | template<typename _Tp> |
1441 | struct is_same<_Tp, _Tp> | |
1442 | : public true_type | |
1443 | { }; | |
1444 | #endif | |
1445 | ||
939759fc | 1446 | /// is_base_of |
e133ace8 PC |
1447 | template<typename _Base, typename _Derived> |
1448 | struct is_base_of | |
1449 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1450 | { }; | |
1451 | ||
297f34d7 | 1452 | template<typename _From, typename _To, |
123c516a PC |
1453 | bool = __or_<is_void<_From>, is_function<_To>, |
1454 | is_array<_To>>::value> | |
297f34d7 | 1455 | struct __is_convertible_helper |
8df27fcb JW |
1456 | { |
1457 | typedef typename is_void<_To>::type type; | |
8df27fcb | 1458 | }; |
297f34d7 | 1459 | |
cc28d234 JW |
1460 | #pragma GCC diagnostic push |
1461 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
e133ace8 | 1462 | template<typename _From, typename _To> |
b0302c68 | 1463 | class __is_convertible_helper<_From, _To, false> |
e133ace8 | 1464 | { |
8df27fcb JW |
1465 | template<typename _To1> |
1466 | static void __test_aux(_To1) noexcept; | |
8e7d962a | 1467 | |
82b12c4b FD |
1468 | template<typename _From1, typename _To1, |
1469 | typename = decltype(__test_aux<_To1>(std::declval<_From1>()))> | |
1470 | static true_type | |
8e7d962a PC |
1471 | __test(int); |
1472 | ||
1473 | template<typename, typename> | |
82b12c4b FD |
1474 | static false_type |
1475 | __test(...); | |
297f34d7 | 1476 | |
e133ace8 | 1477 | public: |
82b12c4b | 1478 | typedef decltype(__test<_From, _To>(0)) type; |
e133ace8 | 1479 | }; |
cc28d234 | 1480 | #pragma GCC diagnostic pop |
82b12c4b | 1481 | |
b0302c68 | 1482 | /// is_convertible |
e133ace8 PC |
1483 | template<typename _From, typename _To> |
1484 | struct is_convertible | |
82b12c4b | 1485 | : public __is_convertible_helper<_From, _To>::type |
e133ace8 PC |
1486 | { }; |
1487 | ||
0302a2de JW |
1488 | // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N> |
1489 | template<typename _ToElementType, typename _FromElementType> | |
1490 | using __is_array_convertible | |
1491 | = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>; | |
1492 | ||
608a080c | 1493 | template<typename _From, typename _To, |
ed99e818 JW |
1494 | bool = __or_<is_void<_From>, is_function<_To>, |
1495 | is_array<_To>>::value> | |
1496 | struct __is_nt_convertible_helper | |
1497 | : is_void<_To> | |
1498 | { }; | |
1499 | ||
cc28d234 JW |
1500 | #pragma GCC diagnostic push |
1501 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
ed99e818 JW |
1502 | template<typename _From, typename _To> |
1503 | class __is_nt_convertible_helper<_From, _To, false> | |
1504 | { | |
1505 | template<typename _To1> | |
1506 | static void __test_aux(_To1) noexcept; | |
1507 | ||
1508 | template<typename _From1, typename _To1> | |
ce9f305e JW |
1509 | static |
1510 | __bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))> | |
ed99e818 JW |
1511 | __test(int); |
1512 | ||
1513 | template<typename, typename> | |
1514 | static false_type | |
1515 | __test(...); | |
1516 | ||
1517 | public: | |
1518 | using type = decltype(__test<_From, _To>(0)); | |
1519 | }; | |
cc28d234 | 1520 | #pragma GCC diagnostic pop |
ed99e818 | 1521 | |
ce9f305e JW |
1522 | // is_nothrow_convertible for C++11 |
1523 | template<typename _From, typename _To> | |
1524 | struct __is_nothrow_convertible | |
1525 | : public __is_nt_convertible_helper<_From, _To>::type | |
1526 | { }; | |
1527 | ||
1528 | #if __cplusplus > 201703L | |
56772f62 | 1529 | #define __cpp_lib_is_nothrow_convertible 201806L |
8df27fcb JW |
1530 | /// is_nothrow_convertible |
1531 | template<typename _From, typename _To> | |
1532 | struct is_nothrow_convertible | |
ed99e818 | 1533 | : public __is_nt_convertible_helper<_From, _To>::type |
8df27fcb JW |
1534 | { }; |
1535 | ||
1536 | /// is_nothrow_convertible_v | |
1537 | template<typename _From, typename _To> | |
1538 | inline constexpr bool is_nothrow_convertible_v | |
1539 | = is_nothrow_convertible<_From, _To>::value; | |
1540 | #endif // C++2a | |
fd735b6a | 1541 | |
c0ffa2ba | 1542 | // Const-volatile modifications. |
7b50cdef | 1543 | |
123c516a | 1544 | /// remove_const |
7b50cdef | 1545 | template<typename _Tp> |
123c516a PC |
1546 | struct remove_const |
1547 | { typedef _Tp type; }; | |
7b50cdef | 1548 | |
123c516a PC |
1549 | template<typename _Tp> |
1550 | struct remove_const<_Tp const> | |
1551 | { typedef _Tp type; }; | |
33ac58d5 | 1552 | |
123c516a PC |
1553 | /// remove_volatile |
1554 | template<typename _Tp> | |
1555 | struct remove_volatile | |
1556 | { typedef _Tp type; }; | |
7b50cdef | 1557 | |
123c516a PC |
1558 | template<typename _Tp> |
1559 | struct remove_volatile<_Tp volatile> | |
1560 | { typedef _Tp type; }; | |
33ac58d5 | 1561 | |
123c516a PC |
1562 | /// remove_cv |
1563 | template<typename _Tp> | |
1564 | struct remove_cv | |
391d5d2e JW |
1565 | { using type = _Tp; }; |
1566 | ||
1567 | template<typename _Tp> | |
1568 | struct remove_cv<const _Tp> | |
1569 | { using type = _Tp; }; | |
1570 | ||
1571 | template<typename _Tp> | |
1572 | struct remove_cv<volatile _Tp> | |
1573 | { using type = _Tp; }; | |
1574 | ||
1575 | template<typename _Tp> | |
1576 | struct remove_cv<const volatile _Tp> | |
1577 | { using type = _Tp; }; | |
33ac58d5 | 1578 | |
123c516a PC |
1579 | /// add_const |
1580 | template<typename _Tp> | |
1581 | struct add_const | |
1582 | { typedef _Tp const type; }; | |
33ac58d5 | 1583 | |
123c516a PC |
1584 | /// add_volatile |
1585 | template<typename _Tp> | |
1586 | struct add_volatile | |
1587 | { typedef _Tp volatile type; }; | |
33ac58d5 | 1588 | |
123c516a PC |
1589 | /// add_cv |
1590 | template<typename _Tp> | |
1591 | struct add_cv | |
1592 | { | |
1593 | typedef typename | |
1594 | add_const<typename add_volatile<_Tp>::type>::type type; | |
1595 | }; | |
7b50cdef | 1596 | |
4457e88c | 1597 | #if __cplusplus > 201103L |
a15f7cb8 ESR |
1598 | |
1599 | #define __cpp_lib_transformation_trait_aliases 201304 | |
1600 | ||
4457e88c JW |
1601 | /// Alias template for remove_const |
1602 | template<typename _Tp> | |
1603 | using remove_const_t = typename remove_const<_Tp>::type; | |
1604 | ||
1605 | /// Alias template for remove_volatile | |
1606 | template<typename _Tp> | |
1607 | using remove_volatile_t = typename remove_volatile<_Tp>::type; | |
1608 | ||
1609 | /// Alias template for remove_cv | |
1610 | template<typename _Tp> | |
1611 | using remove_cv_t = typename remove_cv<_Tp>::type; | |
1612 | ||
1613 | /// Alias template for add_const | |
1614 | template<typename _Tp> | |
1615 | using add_const_t = typename add_const<_Tp>::type; | |
1616 | ||
1617 | /// Alias template for add_volatile | |
1618 | template<typename _Tp> | |
1619 | using add_volatile_t = typename add_volatile<_Tp>::type; | |
1620 | ||
1621 | /// Alias template for add_cv | |
1622 | template<typename _Tp> | |
1623 | using add_cv_t = typename add_cv<_Tp>::type; | |
1624 | #endif | |
7b50cdef | 1625 | |
123c516a | 1626 | // Reference transformations. |
7b50cdef | 1627 | |
123c516a PC |
1628 | /// remove_reference |
1629 | template<typename _Tp> | |
1630 | struct remove_reference | |
1631 | { typedef _Tp type; }; | |
7b50cdef | 1632 | |
123c516a PC |
1633 | template<typename _Tp> |
1634 | struct remove_reference<_Tp&> | |
1635 | { typedef _Tp type; }; | |
7b50cdef | 1636 | |
123c516a PC |
1637 | template<typename _Tp> |
1638 | struct remove_reference<_Tp&&> | |
1639 | { typedef _Tp type; }; | |
1640 | ||
89898034 | 1641 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
123c516a PC |
1642 | struct __add_lvalue_reference_helper |
1643 | { typedef _Tp type; }; | |
7b50cdef | 1644 | |
5e108459 | 1645 | template<typename _Tp> |
89898034 | 1646 | struct __add_lvalue_reference_helper<_Tp, true> |
123c516a | 1647 | { typedef _Tp& type; }; |
5e108459 | 1648 | |
123c516a | 1649 | /// add_lvalue_reference |
5e108459 | 1650 | template<typename _Tp> |
123c516a PC |
1651 | struct add_lvalue_reference |
1652 | : public __add_lvalue_reference_helper<_Tp> | |
1653 | { }; | |
1654 | ||
89898034 | 1655 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
123c516a PC |
1656 | struct __add_rvalue_reference_helper |
1657 | { typedef _Tp type; }; | |
5e108459 PC |
1658 | |
1659 | template<typename _Tp> | |
123c516a PC |
1660 | struct __add_rvalue_reference_helper<_Tp, true> |
1661 | { typedef _Tp&& type; }; | |
5e108459 | 1662 | |
123c516a | 1663 | /// add_rvalue_reference |
5e108459 | 1664 | template<typename _Tp> |
123c516a PC |
1665 | struct add_rvalue_reference |
1666 | : public __add_rvalue_reference_helper<_Tp> | |
1667 | { }; | |
5e108459 | 1668 | |
4457e88c JW |
1669 | #if __cplusplus > 201103L |
1670 | /// Alias template for remove_reference | |
1671 | template<typename _Tp> | |
1672 | using remove_reference_t = typename remove_reference<_Tp>::type; | |
1673 | ||
1674 | /// Alias template for add_lvalue_reference | |
1675 | template<typename _Tp> | |
1676 | using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; | |
1677 | ||
1678 | /// Alias template for add_rvalue_reference | |
1679 | template<typename _Tp> | |
1680 | using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; | |
1681 | #endif | |
7b50cdef | 1682 | |
c0ffa2ba | 1683 | // Sign modifications. |
123c516a | 1684 | |
6963c3b9 JW |
1685 | /// @cond undocumented |
1686 | ||
7b50cdef BK |
1687 | // Utility for constructing identically cv-qualified types. |
1688 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1689 | struct __cv_selector; | |
1690 | ||
1691 | template<typename _Unqualified> | |
1692 | struct __cv_selector<_Unqualified, false, false> | |
1693 | { typedef _Unqualified __type; }; | |
1694 | ||
1695 | template<typename _Unqualified> | |
1696 | struct __cv_selector<_Unqualified, false, true> | |
1697 | { typedef volatile _Unqualified __type; }; | |
1698 | ||
1699 | template<typename _Unqualified> | |
1700 | struct __cv_selector<_Unqualified, true, false> | |
1701 | { typedef const _Unqualified __type; }; | |
1702 | ||
1703 | template<typename _Unqualified> | |
1704 | struct __cv_selector<_Unqualified, true, true> | |
1705 | { typedef const volatile _Unqualified __type; }; | |
1706 | ||
1707 | template<typename _Qualified, typename _Unqualified, | |
1708 | bool _IsConst = is_const<_Qualified>::value, | |
1709 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1710 | class __match_cv_qualifiers |
7b50cdef | 1711 | { |
7b50cdef BK |
1712 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1713 | ||
1714 | public: | |
33ac58d5 | 1715 | typedef typename __match::__type __type; |
7b50cdef BK |
1716 | }; |
1717 | ||
7b50cdef BK |
1718 | // Utility for finding the unsigned versions of signed integral types. |
1719 | template<typename _Tp> | |
e133ace8 PC |
1720 | struct __make_unsigned |
1721 | { typedef _Tp __type; }; | |
7b50cdef BK |
1722 | |
1723 | template<> | |
1724 | struct __make_unsigned<char> | |
1725 | { typedef unsigned char __type; }; | |
1726 | ||
1727 | template<> | |
1728 | struct __make_unsigned<signed char> | |
1729 | { typedef unsigned char __type; }; | |
1730 | ||
7b50cdef BK |
1731 | template<> |
1732 | struct __make_unsigned<short> | |
1733 | { typedef unsigned short __type; }; | |
1734 | ||
1735 | template<> | |
1736 | struct __make_unsigned<int> | |
1737 | { typedef unsigned int __type; }; | |
1738 | ||
1739 | template<> | |
1740 | struct __make_unsigned<long> | |
1741 | { typedef unsigned long __type; }; | |
1742 | ||
1743 | template<> | |
1744 | struct __make_unsigned<long long> | |
1745 | { typedef unsigned long long __type; }; | |
1746 | ||
78a7c317 | 1747 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1748 | __extension__ |
78a7c317 DD |
1749 | template<> |
1750 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0> | |
1751 | { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1752 | #endif | |
1753 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1754 | __extension__ |
78a7c317 DD |
1755 | template<> |
1756 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1> | |
1757 | { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1758 | #endif | |
1759 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1760 | __extension__ |
6d585f01 | 1761 | template<> |
78a7c317 DD |
1762 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2> |
1763 | { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1764 | #endif | |
1765 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1766 | __extension__ |
78a7c317 DD |
1767 | template<> |
1768 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3> | |
1769 | { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1770 | #endif |
1771 | ||
7b50cdef | 1772 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1773 | template<typename _Tp, |
7b50cdef | 1774 | bool _IsInt = is_integral<_Tp>::value, |
7b50cdef | 1775 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1776 | class __make_unsigned_selector; |
1777 | ||
7b50cdef | 1778 | template<typename _Tp> |
b0302c68 | 1779 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1780 | { |
22f1f4c7 | 1781 | using __unsigned_type |
391d5d2e | 1782 | = typename __make_unsigned<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1783 | |
1784 | public: | |
22f1f4c7 JW |
1785 | using __type |
1786 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
7b50cdef BK |
1787 | }; |
1788 | ||
22f1f4c7 JW |
1789 | class __make_unsigned_selector_base |
1790 | { | |
1791 | protected: | |
1792 | template<typename...> struct _List { }; | |
1793 | ||
1794 | template<typename _Tp, typename... _Up> | |
1795 | struct _List<_Tp, _Up...> : _List<_Up...> | |
1796 | { static constexpr size_t __size = sizeof(_Tp); }; | |
1797 | ||
1798 | template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)> | |
1799 | struct __select; | |
1800 | ||
1801 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1802 | struct __select<_Sz, _List<_Uint, _UInts...>, true> | |
1803 | { using __type = _Uint; }; | |
1804 | ||
1805 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1806 | struct __select<_Sz, _List<_Uint, _UInts...>, false> | |
1807 | : __select<_Sz, _List<_UInts...>> | |
1808 | { }; | |
1809 | }; | |
1810 | ||
1811 | // Choose unsigned integer type with the smallest rank and same size as _Tp | |
7b50cdef | 1812 | template<typename _Tp> |
b0302c68 | 1813 | class __make_unsigned_selector<_Tp, false, true> |
22f1f4c7 | 1814 | : __make_unsigned_selector_base |
7b50cdef | 1815 | { |
a0230468 | 1816 | // With -fshort-enums, an enum may be as small as a char. |
22f1f4c7 JW |
1817 | using _UInts = _List<unsigned char, unsigned short, unsigned int, |
1818 | unsigned long, unsigned long long>; | |
1819 | ||
1820 | using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type; | |
73d81d3a | 1821 | |
7b50cdef | 1822 | public: |
22f1f4c7 JW |
1823 | using __type |
1824 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
1825 | }; | |
1826 | ||
c124af93 TH |
1827 | // wchar_t, char8_t, char16_t and char32_t are integral types but are |
1828 | // neither signed integer types nor unsigned integer types, so must be | |
22f1f4c7 JW |
1829 | // transformed to the unsigned integer type with the smallest rank. |
1830 | // Use the partial specialization for enumeration types to do that. | |
29e41848 | 1831 | #ifdef __WCHAR_TYPE__ |
22f1f4c7 JW |
1832 | template<> |
1833 | struct __make_unsigned<wchar_t> | |
1834 | { | |
1835 | using __type | |
1836 | = typename __make_unsigned_selector<wchar_t, false, true>::__type; | |
1837 | }; | |
1838 | #endif | |
1839 | ||
c124af93 TH |
1840 | #ifdef _GLIBCXX_USE_CHAR8_T |
1841 | template<> | |
1842 | struct __make_unsigned<char8_t> | |
1843 | { | |
1844 | using __type | |
1845 | = typename __make_unsigned_selector<char8_t, false, true>::__type; | |
1846 | }; | |
1847 | #endif | |
1848 | ||
22f1f4c7 JW |
1849 | template<> |
1850 | struct __make_unsigned<char16_t> | |
1851 | { | |
1852 | using __type | |
1853 | = typename __make_unsigned_selector<char16_t, false, true>::__type; | |
1854 | }; | |
1855 | ||
1856 | template<> | |
1857 | struct __make_unsigned<char32_t> | |
1858 | { | |
1859 | using __type | |
1860 | = typename __make_unsigned_selector<char32_t, false, true>::__type; | |
7b50cdef | 1861 | }; |
6963c3b9 | 1862 | /// @endcond |
7b50cdef | 1863 | |
7b50cdef BK |
1864 | // Given an integral/enum type, return the corresponding unsigned |
1865 | // integer type. | |
5b9daa7e BK |
1866 | // Primary template. |
1867 | /// make_unsigned | |
7b50cdef | 1868 | template<typename _Tp> |
33ac58d5 | 1869 | struct make_unsigned |
7b50cdef BK |
1870 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; |
1871 | ||
1872 | // Integral, but don't define. | |
1873 | template<> | |
1874 | struct make_unsigned<bool>; | |
1875 | ||
6963c3b9 | 1876 | /// @cond undocumented |
7b50cdef BK |
1877 | |
1878 | // Utility for finding the signed versions of unsigned integral types. | |
1879 | template<typename _Tp> | |
e133ace8 PC |
1880 | struct __make_signed |
1881 | { typedef _Tp __type; }; | |
7b50cdef BK |
1882 | |
1883 | template<> | |
1884 | struct __make_signed<char> | |
1885 | { typedef signed char __type; }; | |
1886 | ||
1887 | template<> | |
1888 | struct __make_signed<unsigned char> | |
1889 | { typedef signed char __type; }; | |
1890 | ||
7b50cdef BK |
1891 | template<> |
1892 | struct __make_signed<unsigned short> | |
1893 | { typedef signed short __type; }; | |
1894 | ||
1895 | template<> | |
1896 | struct __make_signed<unsigned int> | |
1897 | { typedef signed int __type; }; | |
1898 | ||
1899 | template<> | |
1900 | struct __make_signed<unsigned long> | |
1901 | { typedef signed long __type; }; | |
1902 | ||
1903 | template<> | |
1904 | struct __make_signed<unsigned long long> | |
1905 | { typedef signed long long __type; }; | |
1906 | ||
78a7c317 | 1907 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1908 | __extension__ |
78a7c317 DD |
1909 | template<> |
1910 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0> | |
1911 | { typedef __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1912 | #endif | |
1913 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1914 | __extension__ |
78a7c317 DD |
1915 | template<> |
1916 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1> | |
1917 | { typedef __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1918 | #endif | |
1919 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1920 | __extension__ |
78a7c317 DD |
1921 | template<> |
1922 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2> | |
1923 | { typedef __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1924 | #endif | |
1925 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1926 | __extension__ |
6d585f01 | 1927 | template<> |
78a7c317 DD |
1928 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3> |
1929 | { typedef __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1930 | #endif |
1931 | ||
fb8ffd10 | 1932 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1933 | template<typename _Tp, |
7b50cdef | 1934 | bool _IsInt = is_integral<_Tp>::value, |
7b50cdef | 1935 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1936 | class __make_signed_selector; |
1937 | ||
7b50cdef | 1938 | template<typename _Tp> |
b0302c68 | 1939 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1940 | { |
22f1f4c7 | 1941 | using __signed_type |
391d5d2e | 1942 | = typename __make_signed<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1943 | |
1944 | public: | |
22f1f4c7 JW |
1945 | using __type |
1946 | = typename __match_cv_qualifiers<_Tp, __signed_type>::__type; | |
7b50cdef BK |
1947 | }; |
1948 | ||
22f1f4c7 | 1949 | // Choose signed integer type with the smallest rank and same size as _Tp |
7b50cdef | 1950 | template<typename _Tp> |
b0302c68 | 1951 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1952 | { |
73d81d3a | 1953 | typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type; |
7b50cdef BK |
1954 | |
1955 | public: | |
73d81d3a | 1956 | typedef typename __make_signed_selector<__unsigned_type>::__type __type; |
7b50cdef BK |
1957 | }; |
1958 | ||
22f1f4c7 | 1959 | // wchar_t, char16_t and char32_t are integral types but are neither |
d4b695e4 | 1960 | // signed integer types nor unsigned integer types, so must be |
22f1f4c7 JW |
1961 | // transformed to the signed integer type with the smallest rank. |
1962 | // Use the partial specialization for enumeration types to do that. | |
29e41848 | 1963 | #if defined(__WCHAR_TYPE__) |
22f1f4c7 JW |
1964 | template<> |
1965 | struct __make_signed<wchar_t> | |
1966 | { | |
1967 | using __type | |
1968 | = typename __make_signed_selector<wchar_t, false, true>::__type; | |
1969 | }; | |
1970 | #endif | |
1971 | ||
c124af93 TH |
1972 | #if defined(_GLIBCXX_USE_CHAR8_T) |
1973 | template<> | |
1974 | struct __make_signed<char8_t> | |
1975 | { | |
1976 | using __type | |
1977 | = typename __make_signed_selector<char8_t, false, true>::__type; | |
1978 | }; | |
1979 | #endif | |
1980 | ||
22f1f4c7 JW |
1981 | template<> |
1982 | struct __make_signed<char16_t> | |
1983 | { | |
1984 | using __type | |
1985 | = typename __make_signed_selector<char16_t, false, true>::__type; | |
1986 | }; | |
1987 | ||
1988 | template<> | |
1989 | struct __make_signed<char32_t> | |
1990 | { | |
1991 | using __type | |
1992 | = typename __make_signed_selector<char32_t, false, true>::__type; | |
1993 | }; | |
6963c3b9 | 1994 | /// @endcond |
22f1f4c7 | 1995 | |
7b50cdef BK |
1996 | // Given an integral/enum type, return the corresponding signed |
1997 | // integer type. | |
5b9daa7e BK |
1998 | // Primary template. |
1999 | /// make_signed | |
7b50cdef | 2000 | template<typename _Tp> |
33ac58d5 | 2001 | struct make_signed |
7b50cdef BK |
2002 | { typedef typename __make_signed_selector<_Tp>::__type type; }; |
2003 | ||
2004 | // Integral, but don't define. | |
2005 | template<> | |
2006 | struct make_signed<bool>; | |
cfa9a96b | 2007 | |
4457e88c JW |
2008 | #if __cplusplus > 201103L |
2009 | /// Alias template for make_signed | |
2010 | template<typename _Tp> | |
2011 | using make_signed_t = typename make_signed<_Tp>::type; | |
2012 | ||
2013 | /// Alias template for make_unsigned | |
2014 | template<typename _Tp> | |
2015 | using make_unsigned_t = typename make_unsigned<_Tp>::type; | |
2016 | #endif | |
123c516a | 2017 | |
c0ffa2ba | 2018 | // Array modifications. |
123c516a PC |
2019 | |
2020 | /// remove_extent | |
2021 | template<typename _Tp> | |
2022 | struct remove_extent | |
2023 | { typedef _Tp type; }; | |
2024 | ||
2025 | template<typename _Tp, std::size_t _Size> | |
2026 | struct remove_extent<_Tp[_Size]> | |
2027 | { typedef _Tp type; }; | |
2028 | ||
2029 | template<typename _Tp> | |
2030 | struct remove_extent<_Tp[]> | |
2031 | { typedef _Tp type; }; | |
2032 | ||
2033 | /// remove_all_extents | |
2034 | template<typename _Tp> | |
2035 | struct remove_all_extents | |
2036 | { typedef _Tp type; }; | |
2037 | ||
2038 | template<typename _Tp, std::size_t _Size> | |
2039 | struct remove_all_extents<_Tp[_Size]> | |
2040 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
2041 | ||
2042 | template<typename _Tp> | |
2043 | struct remove_all_extents<_Tp[]> | |
2044 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
2045 | ||
4457e88c JW |
2046 | #if __cplusplus > 201103L |
2047 | /// Alias template for remove_extent | |
2048 | template<typename _Tp> | |
2049 | using remove_extent_t = typename remove_extent<_Tp>::type; | |
2050 | ||
2051 | /// Alias template for remove_all_extents | |
2052 | template<typename _Tp> | |
2053 | using remove_all_extents_t = typename remove_all_extents<_Tp>::type; | |
2054 | #endif | |
123c516a | 2055 | |
c0ffa2ba | 2056 | // Pointer modifications. |
123c516a PC |
2057 | |
2058 | template<typename _Tp, typename> | |
2059 | struct __remove_pointer_helper | |
2060 | { typedef _Tp type; }; | |
2061 | ||
2062 | template<typename _Tp, typename _Up> | |
2063 | struct __remove_pointer_helper<_Tp, _Up*> | |
2064 | { typedef _Up type; }; | |
2065 | ||
2066 | /// remove_pointer | |
2067 | template<typename _Tp> | |
2068 | struct remove_pointer | |
391d5d2e | 2069 | : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>> |
123c516a PC |
2070 | { }; |
2071 | ||
89898034 DK |
2072 | template<typename _Tp, bool = __or_<__is_referenceable<_Tp>, |
2073 | is_void<_Tp>>::value> | |
2074 | struct __add_pointer_helper | |
2075 | { typedef _Tp type; }; | |
2076 | ||
123c516a | 2077 | template<typename _Tp> |
89898034 | 2078 | struct __add_pointer_helper<_Tp, true> |
123c516a PC |
2079 | { typedef typename remove_reference<_Tp>::type* type; }; |
2080 | ||
6963c3b9 | 2081 | /// add_pointer |
89898034 | 2082 | template<typename _Tp> |
33ac58d5 | 2083 | struct add_pointer |
89898034 DK |
2084 | : public __add_pointer_helper<_Tp> |
2085 | { }; | |
2086 | ||
4457e88c JW |
2087 | #if __cplusplus > 201103L |
2088 | /// Alias template for remove_pointer | |
2089 | template<typename _Tp> | |
2090 | using remove_pointer_t = typename remove_pointer<_Tp>::type; | |
2091 | ||
2092 | /// Alias template for add_pointer | |
2093 | template<typename _Tp> | |
2094 | using add_pointer_t = typename add_pointer<_Tp>::type; | |
2095 | #endif | |
123c516a PC |
2096 | |
2097 | template<std::size_t _Len> | |
2098 | struct __aligned_storage_msa | |
33ac58d5 | 2099 | { |
123c516a PC |
2100 | union __type |
2101 | { | |
2102 | unsigned char __data[_Len]; | |
33ac58d5 | 2103 | struct __attribute__((__aligned__)) { } __align; |
123c516a PC |
2104 | }; |
2105 | }; | |
2106 | ||
2107 | /** | |
2108 | * @brief Alignment type. | |
2109 | * | |
2110 | * The value of _Align is a default-alignment which shall be the | |
2111 | * most stringent alignment requirement for any C++ object type | |
2112 | * whose size is no greater than _Len (3.9). The member typedef | |
2113 | * type shall be a POD type suitable for use as uninitialized | |
2114 | * storage for any object whose size is at most _Len and whose | |
2115 | * alignment is a divisor of _Align. | |
2116 | */ | |
2117 | template<std::size_t _Len, std::size_t _Align = | |
2118 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2119 | struct aligned_storage | |
33ac58d5 | 2120 | { |
123c516a PC |
2121 | union type |
2122 | { | |
2123 | unsigned char __data[_Len]; | |
33ac58d5 | 2124 | struct __attribute__((__aligned__((_Align)))) { } __align; |
123c516a PC |
2125 | }; |
2126 | }; | |
2127 | ||
d3718027 RS |
2128 | template <typename... _Types> |
2129 | struct __strictest_alignment | |
2130 | { | |
2131 | static const size_t _S_alignment = 0; | |
2132 | static const size_t _S_size = 0; | |
2133 | }; | |
2134 | ||
2135 | template <typename _Tp, typename... _Types> | |
2136 | struct __strictest_alignment<_Tp, _Types...> | |
2137 | { | |
2138 | static const size_t _S_alignment = | |
2139 | alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment | |
2140 | ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment; | |
2141 | static const size_t _S_size = | |
2142 | sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size | |
2143 | ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size; | |
2144 | }; | |
2145 | ||
2146 | /** | |
2147 | * @brief Provide aligned storage for types. | |
2148 | * | |
2149 | * [meta.trans.other] | |
2150 | * | |
2151 | * Provides aligned storage for any of the provided types of at | |
2152 | * least size _Len. | |
2153 | * | |
2154 | * @see aligned_storage | |
2155 | */ | |
2156 | template <size_t _Len, typename... _Types> | |
2157 | struct aligned_union | |
2158 | { | |
2159 | private: | |
2160 | static_assert(sizeof...(_Types) != 0, "At least one type is required"); | |
2161 | ||
2162 | using __strictest = __strictest_alignment<_Types...>; | |
2163 | static const size_t _S_len = _Len > __strictest::_S_size | |
2164 | ? _Len : __strictest::_S_size; | |
2165 | public: | |
2166 | /// The value of the strictest alignment of _Types. | |
2167 | static const size_t alignment_value = __strictest::_S_alignment; | |
2168 | /// The storage. | |
2169 | typedef typename aligned_storage<_S_len, alignment_value>::type type; | |
2170 | }; | |
2171 | ||
2172 | template <size_t _Len, typename... _Types> | |
2173 | const size_t aligned_union<_Len, _Types...>::alignment_value; | |
123c516a | 2174 | |
6963c3b9 JW |
2175 | /// @cond undocumented |
2176 | ||
123c516a PC |
2177 | // Decay trait for arrays and functions, used for perfect forwarding |
2178 | // in make_pair, make_tuple, etc. | |
33ac58d5 | 2179 | template<typename _Up, |
123c516a | 2180 | bool _IsArray = is_array<_Up>::value, |
33ac58d5 | 2181 | bool _IsFunction = is_function<_Up>::value> |
123c516a PC |
2182 | struct __decay_selector; |
2183 | ||
2184 | // NB: DR 705. | |
33ac58d5 | 2185 | template<typename _Up> |
123c516a | 2186 | struct __decay_selector<_Up, false, false> |
391d5d2e | 2187 | { typedef __remove_cv_t<_Up> __type; }; |
123c516a | 2188 | |
33ac58d5 | 2189 | template<typename _Up> |
123c516a PC |
2190 | struct __decay_selector<_Up, true, false> |
2191 | { typedef typename remove_extent<_Up>::type* __type; }; | |
2192 | ||
33ac58d5 | 2193 | template<typename _Up> |
123c516a PC |
2194 | struct __decay_selector<_Up, false, true> |
2195 | { typedef typename add_pointer<_Up>::type __type; }; | |
6963c3b9 | 2196 | /// @endcond |
123c516a PC |
2197 | |
2198 | /// decay | |
33ac58d5 JW |
2199 | template<typename _Tp> |
2200 | class decay | |
2201 | { | |
123c516a PC |
2202 | typedef typename remove_reference<_Tp>::type __remove_type; |
2203 | ||
2204 | public: | |
2205 | typedef typename __decay_selector<__remove_type>::__type type; | |
2206 | }; | |
2207 | ||
6963c3b9 | 2208 | /// @cond undocumented |
123c516a PC |
2209 | |
2210 | // Helper which adds a reference to a type when given a reference_wrapper | |
2211 | template<typename _Tp> | |
2212 | struct __strip_reference_wrapper | |
2213 | { | |
2214 | typedef _Tp __type; | |
2215 | }; | |
2216 | ||
2217 | template<typename _Tp> | |
2218 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
2219 | { | |
2220 | typedef _Tp& __type; | |
2221 | }; | |
2222 | ||
6963c3b9 | 2223 | // __decay_t (std::decay_t for C++11). |
123c516a | 2224 | template<typename _Tp> |
6963c3b9 | 2225 | using __decay_t = typename decay<_Tp>::type; |
123c516a | 2226 | |
6963c3b9 JW |
2227 | template<typename _Tp> |
2228 | using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>; | |
2229 | /// @endcond | |
123c516a | 2230 | |
123c516a | 2231 | // Primary template. |
6963c3b9 | 2232 | /// Define a member typedef `type` only if a boolean constant is true. |
123c516a | 2233 | template<bool, typename _Tp = void> |
33ac58d5 | 2234 | struct enable_if |
123c516a PC |
2235 | { }; |
2236 | ||
2237 | // Partial specialization for true. | |
2238 | template<typename _Tp> | |
2239 | struct enable_if<true, _Tp> | |
2240 | { typedef _Tp type; }; | |
2241 | ||
6963c3b9 JW |
2242 | /// @cond undocumented |
2243 | ||
391d5d2e JW |
2244 | // __enable_if_t (std::enable_if_t for C++11) |
2245 | template<bool _Cond, typename _Tp = void> | |
2246 | using __enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2247 | ||
6963c3b9 | 2248 | // Helper for SFINAE constraints |
23df8534 | 2249 | template<typename... _Cond> |
391d5d2e | 2250 | using _Require = __enable_if_t<__and_<_Cond...>::value>; |
123c516a | 2251 | |
6963c3b9 JW |
2252 | // __remove_cvref_t (std::remove_cvref_t for C++11). |
2253 | template<typename _Tp> | |
2254 | using __remove_cvref_t | |
2255 | = typename remove_cv<typename remove_reference<_Tp>::type>::type; | |
2256 | /// @endcond | |
2257 | ||
123c516a | 2258 | // Primary template. |
13901e4b | 2259 | /// Define a member typedef @c type to one of two argument types. |
123c516a PC |
2260 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2261 | struct conditional | |
2262 | { typedef _Iftrue type; }; | |
2263 | ||
2264 | // Partial specialization for false. | |
2265 | template<typename _Iftrue, typename _Iffalse> | |
2266 | struct conditional<false, _Iftrue, _Iffalse> | |
2267 | { typedef _Iffalse type; }; | |
2268 | ||
5b9daa7e | 2269 | /// common_type |
cfa9a96b CF |
2270 | template<typename... _Tp> |
2271 | struct common_type; | |
2272 | ||
c0ffa2ba | 2273 | // Sfinae-friendly common_type implementation: |
b3618b71 | 2274 | |
6963c3b9 | 2275 | /// @cond undocumented |
b3618b71 DK |
2276 | struct __do_common_type_impl |
2277 | { | |
2278 | template<typename _Tp, typename _Up> | |
f61a12b3 JW |
2279 | using __cond_t |
2280 | = decltype(true ? std::declval<_Tp>() : std::declval<_Up>()); | |
2281 | ||
0f8b14ee JW |
2282 | // if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2283 | // denotes a valid type, let C denote that type. | |
f61a12b3 | 2284 | template<typename _Tp, typename _Up> |
0f8b14ee | 2285 | static __success_type<__decay_t<__cond_t<_Tp, _Up>>> |
f61a12b3 | 2286 | _S_test(int); |
b3618b71 | 2287 | |
0f8b14ee JW |
2288 | #if __cplusplus > 201703L |
2289 | // Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type, | |
2290 | // let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>. | |
2291 | template<typename _Tp, typename _Up> | |
2292 | static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>> | |
2293 | _S_test_2(int); | |
2294 | #endif | |
2295 | ||
b3618b71 | 2296 | template<typename, typename> |
f61a12b3 | 2297 | static __failure_type |
0f8b14ee JW |
2298 | _S_test_2(...); |
2299 | ||
2300 | template<typename _Tp, typename _Up> | |
2301 | static decltype(_S_test_2<_Tp, _Up>(0)) | |
f61a12b3 | 2302 | _S_test(...); |
b3618b71 DK |
2303 | }; |
2304 | ||
f61a12b3 JW |
2305 | // If sizeof...(T) is zero, there shall be no member type. |
2306 | template<> | |
2307 | struct common_type<> | |
2308 | { }; | |
b3618b71 | 2309 | |
f61a12b3 JW |
2310 | // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>. |
2311 | template<typename _Tp0> | |
2312 | struct common_type<_Tp0> | |
2313 | : public common_type<_Tp0, _Tp0> | |
2314 | { }; | |
b3618b71 | 2315 | |
f61a12b3 JW |
2316 | // If sizeof...(T) is two, ... |
2317 | template<typename _Tp1, typename _Tp2, | |
391d5d2e | 2318 | typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>> |
f61a12b3 | 2319 | struct __common_type_impl |
b3618b71 | 2320 | { |
f61a12b3 JW |
2321 | // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false, |
2322 | // let C denote the same type, if any, as common_type_t<D1, D2>. | |
2323 | using type = common_type<_Dp1, _Dp2>; | |
b3618b71 DK |
2324 | }; |
2325 | ||
f61a12b3 JW |
2326 | template<typename _Tp1, typename _Tp2> |
2327 | struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2> | |
2328 | : private __do_common_type_impl | |
b3618b71 | 2329 | { |
f61a12b3 JW |
2330 | // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2331 | // denotes a valid type, let C denote that type. | |
2332 | using type = decltype(_S_test<_Tp1, _Tp2>(0)); | |
b3618b71 DK |
2333 | }; |
2334 | ||
f61a12b3 JW |
2335 | // If sizeof...(T) is two, ... |
2336 | template<typename _Tp1, typename _Tp2> | |
2337 | struct common_type<_Tp1, _Tp2> | |
2338 | : public __common_type_impl<_Tp1, _Tp2>::type | |
2339 | { }; | |
b3618b71 | 2340 | |
f61a12b3 JW |
2341 | template<typename...> |
2342 | struct __common_type_pack | |
373c726e JW |
2343 | { }; |
2344 | ||
f61a12b3 JW |
2345 | template<typename, typename, typename = void> |
2346 | struct __common_type_fold; | |
2347 | ||
2348 | // If sizeof...(T) is greater than two, ... | |
2349 | template<typename _Tp1, typename _Tp2, typename... _Rp> | |
2350 | struct common_type<_Tp1, _Tp2, _Rp...> | |
2351 | : public __common_type_fold<common_type<_Tp1, _Tp2>, | |
2352 | __common_type_pack<_Rp...>> | |
373c726e | 2353 | { }; |
cfa9a96b | 2354 | |
f61a12b3 JW |
2355 | // Let C denote the same type, if any, as common_type_t<T1, T2>. |
2356 | // If there is such a type C, type shall denote the same type, if any, | |
2357 | // as common_type_t<C, R...>. | |
2358 | template<typename _CTp, typename... _Rp> | |
2359 | struct __common_type_fold<_CTp, __common_type_pack<_Rp...>, | |
2360 | __void_t<typename _CTp::type>> | |
2361 | : public common_type<typename _CTp::type, _Rp...> | |
b3618b71 | 2362 | { }; |
cfa9a96b | 2363 | |
f61a12b3 JW |
2364 | // Otherwise, there shall be no member type. |
2365 | template<typename _CTp, typename _Rp> | |
2366 | struct __common_type_fold<_CTp, _Rp, void> | |
b3618b71 | 2367 | { }; |
7274deff | 2368 | |
3c26b759 JW |
2369 | template<typename _Tp, bool = is_enum<_Tp>::value> |
2370 | struct __underlying_type_impl | |
2371 | { | |
2372 | using type = __underlying_type(_Tp); | |
2373 | }; | |
2374 | ||
2375 | template<typename _Tp> | |
2376 | struct __underlying_type_impl<_Tp, false> | |
2377 | { }; | |
6963c3b9 | 2378 | /// @endcond |
3c26b759 | 2379 | |
13901e4b | 2380 | /// The underlying type of an enum. |
a47407f6 PC |
2381 | template<typename _Tp> |
2382 | struct underlying_type | |
3c26b759 JW |
2383 | : public __underlying_type_impl<_Tp> |
2384 | { }; | |
123c516a | 2385 | |
6963c3b9 | 2386 | /// @cond undocumented |
7274deff PC |
2387 | template<typename _Tp> |
2388 | struct __declval_protector | |
2389 | { | |
2390 | static const bool __stop = false; | |
7274deff | 2391 | }; |
6963c3b9 | 2392 | /// @endcond |
7274deff | 2393 | |
6963c3b9 JW |
2394 | /** Utility to simplify expressions used in unevaluated operands |
2395 | * @since C++11 | |
2396 | * @ingroup utilities | |
2397 | */ | |
7274deff | 2398 | template<typename _Tp> |
ec26ff5a | 2399 | auto declval() noexcept -> decltype(__declval<_Tp>(0)) |
7274deff PC |
2400 | { |
2401 | static_assert(__declval_protector<_Tp>::__stop, | |
2402 | "declval() must not be used!"); | |
ec26ff5a | 2403 | return __declval<_Tp>(0); |
7274deff | 2404 | } |
1041daba | 2405 | |
be7f7822 JW |
2406 | /// result_of |
2407 | template<typename _Signature> | |
0e5abeb0 | 2408 | struct result_of; |
be7f7822 | 2409 | |
c0ffa2ba | 2410 | // Sfinae-friendly result_of implementation: |
83ddb39f | 2411 | |
a15f7cb8 ESR |
2412 | #define __cpp_lib_result_of_sfinae 201210 |
2413 | ||
6963c3b9 | 2414 | /// @cond undocumented |
93e95400 JW |
2415 | struct __invoke_memfun_ref { }; |
2416 | struct __invoke_memfun_deref { }; | |
2417 | struct __invoke_memobj_ref { }; | |
2418 | struct __invoke_memobj_deref { }; | |
2419 | struct __invoke_other { }; | |
2420 | ||
2421 | // Associate a tag type with a specialization of __success_type. | |
2422 | template<typename _Tp, typename _Tag> | |
2423 | struct __result_of_success : __success_type<_Tp> | |
2424 | { using __invoke_type = _Tag; }; | |
2425 | ||
83ddb39f DK |
2426 | // [func.require] paragraph 1 bullet 1: |
2427 | struct __result_of_memfun_ref_impl | |
2428 | { | |
2429 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2430 | static __result_of_success<decltype( |
83ddb39f | 2431 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2432 | ), __invoke_memfun_ref> _S_test(int); |
83ddb39f DK |
2433 | |
2434 | template<typename...> | |
2435 | static __failure_type _S_test(...); | |
2436 | }; | |
2437 | ||
2438 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2439 | struct __result_of_memfun_ref | |
2440 | : private __result_of_memfun_ref_impl | |
2441 | { | |
2442 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2443 | }; | |
2444 | ||
2445 | // [func.require] paragraph 1 bullet 2: | |
2446 | struct __result_of_memfun_deref_impl | |
2447 | { | |
2448 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2449 | static __result_of_success<decltype( |
83ddb39f | 2450 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2451 | ), __invoke_memfun_deref> _S_test(int); |
83ddb39f DK |
2452 | |
2453 | template<typename...> | |
2454 | static __failure_type _S_test(...); | |
2455 | }; | |
2456 | ||
2457 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2458 | struct __result_of_memfun_deref | |
2459 | : private __result_of_memfun_deref_impl | |
2460 | { | |
2461 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2462 | }; | |
2463 | ||
2464 | // [func.require] paragraph 1 bullet 3: | |
2465 | struct __result_of_memobj_ref_impl | |
2466 | { | |
2467 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2468 | static __result_of_success<decltype( |
83ddb39f | 2469 | std::declval<_Tp1>().*std::declval<_Fp>() |
93e95400 | 2470 | ), __invoke_memobj_ref> _S_test(int); |
83ddb39f DK |
2471 | |
2472 | template<typename, typename> | |
2473 | static __failure_type _S_test(...); | |
2474 | }; | |
2475 | ||
2476 | template<typename _MemPtr, typename _Arg> | |
2477 | struct __result_of_memobj_ref | |
2478 | : private __result_of_memobj_ref_impl | |
2479 | { | |
2480 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2481 | }; | |
2482 | ||
2483 | // [func.require] paragraph 1 bullet 4: | |
2484 | struct __result_of_memobj_deref_impl | |
2485 | { | |
2486 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2487 | static __result_of_success<decltype( |
83ddb39f | 2488 | (*std::declval<_Tp1>()).*std::declval<_Fp>() |
93e95400 | 2489 | ), __invoke_memobj_deref> _S_test(int); |
83ddb39f DK |
2490 | |
2491 | template<typename, typename> | |
2492 | static __failure_type _S_test(...); | |
2493 | }; | |
2494 | ||
be7f7822 | 2495 | template<typename _MemPtr, typename _Arg> |
83ddb39f DK |
2496 | struct __result_of_memobj_deref |
2497 | : private __result_of_memobj_deref_impl | |
2498 | { | |
2499 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2500 | }; | |
2501 | ||
2502 | template<typename _MemPtr, typename _Arg> | |
2503 | struct __result_of_memobj; | |
be7f7822 JW |
2504 | |
2505 | template<typename _Res, typename _Class, typename _Arg> | |
83ddb39f | 2506 | struct __result_of_memobj<_Res _Class::*, _Arg> |
be7f7822 | 2507 | { |
6791489e | 2508 | typedef __remove_cvref_t<_Arg> _Argval; |
83ddb39f | 2509 | typedef _Res _Class::* _MemPtr; |
a09bb4a8 | 2510 | typedef typename __conditional_t<__or_<is_same<_Argval, _Class>, |
83ddb39f DK |
2511 | is_base_of<_Class, _Argval>>::value, |
2512 | __result_of_memobj_ref<_MemPtr, _Arg>, | |
2513 | __result_of_memobj_deref<_MemPtr, _Arg> | |
a09bb4a8 | 2514 | >::type type; |
be7f7822 JW |
2515 | }; |
2516 | ||
83ddb39f DK |
2517 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2518 | struct __result_of_memfun; | |
be7f7822 JW |
2519 | |
2520 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
83ddb39f | 2521 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
be7f7822 | 2522 | { |
81c7cf71 | 2523 | typedef typename remove_reference<_Arg>::type _Argval; |
83ddb39f | 2524 | typedef _Res _Class::* _MemPtr; |
a09bb4a8 | 2525 | typedef typename __conditional_t<is_base_of<_Class, _Argval>::value, |
83ddb39f DK |
2526 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, |
2527 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> | |
a09bb4a8 | 2528 | >::type type; |
be7f7822 JW |
2529 | }; |
2530 | ||
93e95400 JW |
2531 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
2532 | // 2219. INVOKE-ing a pointer to member with a reference_wrapper | |
2533 | // as the object expression | |
93e95400 | 2534 | |
7dcc645c | 2535 | // Used by result_of, invoke etc. to unwrap a reference_wrapper. |
81c7cf71 | 2536 | template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>> |
7dcc645c JW |
2537 | struct __inv_unwrap |
2538 | { | |
2539 | using type = _Tp; | |
2540 | }; | |
f3d7dd52 | 2541 | |
7dcc645c JW |
2542 | template<typename _Tp, typename _Up> |
2543 | struct __inv_unwrap<_Tp, reference_wrapper<_Up>> | |
2544 | { | |
2545 | using type = _Up&; | |
2546 | }; | |
93e95400 | 2547 | |
be7f7822 | 2548 | template<bool, bool, typename _Functor, typename... _ArgTypes> |
83ddb39f | 2549 | struct __result_of_impl |
be7f7822 | 2550 | { |
83ddb39f | 2551 | typedef __failure_type type; |
be7f7822 JW |
2552 | }; |
2553 | ||
2554 | template<typename _MemPtr, typename _Arg> | |
83ddb39f | 2555 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
391d5d2e | 2556 | : public __result_of_memobj<__decay_t<_MemPtr>, |
7dcc645c | 2557 | typename __inv_unwrap<_Arg>::type> |
c4db9a77 | 2558 | { }; |
be7f7822 | 2559 | |
83ddb39f DK |
2560 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2561 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> | |
391d5d2e | 2562 | : public __result_of_memfun<__decay_t<_MemPtr>, |
7dcc645c | 2563 | typename __inv_unwrap<_Arg>::type, _Args...> |
c4db9a77 | 2564 | { }; |
be7f7822 | 2565 | |
83ddb39f DK |
2566 | // [func.require] paragraph 1 bullet 5: |
2567 | struct __result_of_other_impl | |
2568 | { | |
2569 | template<typename _Fn, typename... _Args> | |
93e95400 | 2570 | static __result_of_success<decltype( |
83ddb39f | 2571 | std::declval<_Fn>()(std::declval<_Args>()...) |
93e95400 | 2572 | ), __invoke_other> _S_test(int); |
83ddb39f DK |
2573 | |
2574 | template<typename...> | |
2575 | static __failure_type _S_test(...); | |
2576 | }; | |
2577 | ||
be7f7822 | 2578 | template<typename _Functor, typename... _ArgTypes> |
83ddb39f DK |
2579 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2580 | : private __result_of_other_impl | |
be7f7822 | 2581 | { |
83ddb39f | 2582 | typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
be7f7822 JW |
2583 | }; |
2584 | ||
7dcc645c | 2585 | // __invoke_result (std::invoke_result for C++11) |
83ddb39f | 2586 | template<typename _Functor, typename... _ArgTypes> |
7dcc645c | 2587 | struct __invoke_result |
83ddb39f DK |
2588 | : public __result_of_impl< |
2589 | is_member_object_pointer< | |
2590 | typename remove_reference<_Functor>::type | |
2591 | >::value, | |
2592 | is_member_function_pointer< | |
2593 | typename remove_reference<_Functor>::type | |
2594 | >::value, | |
7dcc645c | 2595 | _Functor, _ArgTypes... |
83ddb39f DK |
2596 | >::type |
2597 | { }; | |
6963c3b9 | 2598 | /// @endcond |
c0ffa2ba | 2599 | |
7dcc645c JW |
2600 | template<typename _Functor, typename... _ArgTypes> |
2601 | struct result_of<_Functor(_ArgTypes...)> | |
2602 | : public __invoke_result<_Functor, _ArgTypes...> | |
2603 | { }; | |
2604 | ||
e112d53a | 2605 | #if __cplusplus >= 201402L |
4457e88c JW |
2606 | /// Alias template for aligned_storage |
2607 | template<size_t _Len, size_t _Align = | |
2608 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2609 | using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; | |
2610 | ||
d3718027 RS |
2611 | template <size_t _Len, typename... _Types> |
2612 | using aligned_union_t = typename aligned_union<_Len, _Types...>::type; | |
2613 | ||
4457e88c JW |
2614 | /// Alias template for decay |
2615 | template<typename _Tp> | |
2616 | using decay_t = typename decay<_Tp>::type; | |
2617 | ||
2618 | /// Alias template for enable_if | |
2619 | template<bool _Cond, typename _Tp = void> | |
2620 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2621 | ||
2622 | /// Alias template for conditional | |
2623 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
2624 | using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type; | |
2625 | ||
2626 | /// Alias template for common_type | |
2627 | template<typename... _Tp> | |
2628 | using common_type_t = typename common_type<_Tp...>::type; | |
2629 | ||
2630 | /// Alias template for underlying_type | |
2631 | template<typename _Tp> | |
2632 | using underlying_type_t = typename underlying_type<_Tp>::type; | |
2633 | ||
2634 | /// Alias template for result_of | |
2635 | template<typename _Tp> | |
2636 | using result_of_t = typename result_of<_Tp>::type; | |
e112d53a JW |
2637 | #endif // C++14 |
2638 | ||
e112d53a | 2639 | #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11 |
bd1eb5e0 JW |
2640 | #define __cpp_lib_void_t 201411 |
2641 | /// A metafunction that always yields void, used for detecting valid types. | |
2642 | template<typename...> using void_t = void; | |
2643 | #endif | |
2644 | ||
6963c3b9 JW |
2645 | /// @cond undocumented |
2646 | ||
6af6bef4 JW |
2647 | /// Implementation of the detection idiom (negative case). |
2648 | template<typename _Default, typename _AlwaysVoid, | |
2649 | template<typename...> class _Op, typename... _Args> | |
2650 | struct __detector | |
2651 | { | |
2652 | using value_t = false_type; | |
2653 | using type = _Default; | |
2654 | }; | |
2655 | ||
2656 | /// Implementation of the detection idiom (positive case). | |
2657 | template<typename _Default, template<typename...> class _Op, | |
2658 | typename... _Args> | |
2659 | struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...> | |
2660 | { | |
2661 | using value_t = true_type; | |
2662 | using type = _Op<_Args...>; | |
2663 | }; | |
2664 | ||
2665 | // Detect whether _Op<_Args...> is a valid type, use _Default if not. | |
2666 | template<typename _Default, template<typename...> class _Op, | |
2667 | typename... _Args> | |
2668 | using __detected_or = __detector<_Default, void, _Op, _Args...>; | |
2669 | ||
2670 | // _Op<_Args...> if that is a valid type, otherwise _Default. | |
2671 | template<typename _Default, template<typename...> class _Op, | |
2672 | typename... _Args> | |
2673 | using __detected_or_t | |
2674 | = typename __detected_or<_Default, _Op, _Args...>::type; | |
2675 | ||
033b71ce PC |
2676 | /** |
2677 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
2678 | * member type _NTYPE. | |
2679 | */ | |
82b12c4b | 2680 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ |
847e9cf8 | 2681 | template<typename _Tp, typename = __void_t<>> \ |
82b12c4b | 2682 | struct __has_##_NTYPE \ |
847e9cf8 JW |
2683 | : false_type \ |
2684 | { }; \ | |
2685 | template<typename _Tp> \ | |
2686 | struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \ | |
2687 | : true_type \ | |
033b71ce PC |
2688 | { }; |
2689 | ||
26b5ace7 DK |
2690 | template <typename _Tp> |
2691 | struct __is_swappable; | |
ddb63209 | 2692 | |
26b5ace7 DK |
2693 | template <typename _Tp> |
2694 | struct __is_nothrow_swappable; | |
ddb63209 | 2695 | |
a2863bde VV |
2696 | template<typename> |
2697 | struct __is_tuple_like_impl : false_type | |
2698 | { }; | |
2699 | ||
a2863bde VV |
2700 | // Internal type trait that allows us to sfinae-protect tuple_cat. |
2701 | template<typename _Tp> | |
2702 | struct __is_tuple_like | |
6791489e | 2703 | : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type |
a2863bde | 2704 | { }; |
6963c3b9 | 2705 | /// @endcond |
a2863bde | 2706 | |
ddb63209 | 2707 | template<typename _Tp> |
7a91c710 | 2708 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2709 | inline |
391d5d2e JW |
2710 | _Require<__not_<__is_tuple_like<_Tp>>, |
2711 | is_move_constructible<_Tp>, | |
2712 | is_move_assignable<_Tp>> | |
ddb63209 VV |
2713 | swap(_Tp&, _Tp&) |
2714 | noexcept(__and_<is_nothrow_move_constructible<_Tp>, | |
2715 | is_nothrow_move_assignable<_Tp>>::value); | |
2716 | ||
2717 | template<typename _Tp, size_t _Nm> | |
7a91c710 | 2718 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2719 | inline |
391d5d2e | 2720 | __enable_if_t<__is_swappable<_Tp>::value> |
ddb63209 | 2721 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) |
26b5ace7 | 2722 | noexcept(__is_nothrow_swappable<_Tp>::value); |
ddb63209 | 2723 | |
6963c3b9 | 2724 | /// @cond undocumented |
26b5ace7 | 2725 | namespace __swappable_details { |
ddb63209 VV |
2726 | using std::swap; |
2727 | ||
26b5ace7 DK |
2728 | struct __do_is_swappable_impl |
2729 | { | |
2730 | template<typename _Tp, typename | |
2731 | = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))> | |
2732 | static true_type __test(int); | |
2733 | ||
2734 | template<typename> | |
2735 | static false_type __test(...); | |
2736 | }; | |
2737 | ||
2738 | struct __do_is_nothrow_swappable_impl | |
2739 | { | |
2740 | template<typename _Tp> | |
2741 | static __bool_constant< | |
2742 | noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>())) | |
2743 | > __test(int); | |
2744 | ||
2745 | template<typename> | |
2746 | static false_type __test(...); | |
2747 | }; | |
2748 | ||
6b9539e2 | 2749 | } // namespace __swappable_details |
ddb63209 | 2750 | |
26b5ace7 DK |
2751 | template<typename _Tp> |
2752 | struct __is_swappable_impl | |
2753 | : public __swappable_details::__do_is_swappable_impl | |
2754 | { | |
2755 | typedef decltype(__test<_Tp>(0)) type; | |
2756 | }; | |
2757 | ||
2758 | template<typename _Tp> | |
ddb63209 | 2759 | struct __is_nothrow_swappable_impl |
26b5ace7 DK |
2760 | : public __swappable_details::__do_is_nothrow_swappable_impl |
2761 | { | |
2762 | typedef decltype(__test<_Tp>(0)) type; | |
2763 | }; | |
ddb63209 | 2764 | |
26b5ace7 DK |
2765 | template<typename _Tp> |
2766 | struct __is_swappable | |
2767 | : public __is_swappable_impl<_Tp>::type | |
ddb63209 VV |
2768 | { }; |
2769 | ||
26b5ace7 | 2770 | template<typename _Tp> |
ddb63209 | 2771 | struct __is_nothrow_swappable |
26b5ace7 | 2772 | : public __is_nothrow_swappable_impl<_Tp>::type |
ddb63209 | 2773 | { }; |
6963c3b9 | 2774 | /// @endcond |
ddb63209 | 2775 | |
6b9539e2 DK |
2776 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
2777 | #define __cpp_lib_is_swappable 201603 | |
2778 | /// Metafunctions used for detecting swappable types: p0185r1 | |
2779 | ||
2780 | /// is_swappable | |
2781 | template<typename _Tp> | |
2782 | struct is_swappable | |
2783 | : public __is_swappable_impl<_Tp>::type | |
608a080c AP |
2784 | { |
2785 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2786 | "template argument must be a complete class or an unbounded array"); | |
2787 | }; | |
6b9539e2 DK |
2788 | |
2789 | /// is_nothrow_swappable | |
2790 | template<typename _Tp> | |
2791 | struct is_nothrow_swappable | |
2792 | : public __is_nothrow_swappable_impl<_Tp>::type | |
608a080c AP |
2793 | { |
2794 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2795 | "template argument must be a complete class or an unbounded array"); | |
2796 | }; | |
6b9539e2 DK |
2797 | |
2798 | #if __cplusplus >= 201402L | |
2799 | /// is_swappable_v | |
2800 | template<typename _Tp> | |
288695f7 DK |
2801 | _GLIBCXX17_INLINE constexpr bool is_swappable_v = |
2802 | is_swappable<_Tp>::value; | |
6b9539e2 DK |
2803 | |
2804 | /// is_nothrow_swappable_v | |
2805 | template<typename _Tp> | |
288695f7 DK |
2806 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v = |
2807 | is_nothrow_swappable<_Tp>::value; | |
6b9539e2 DK |
2808 | #endif // __cplusplus >= 201402L |
2809 | ||
6963c3b9 | 2810 | /// @cond undocumented |
6b9539e2 DK |
2811 | namespace __swappable_with_details { |
2812 | using std::swap; | |
2813 | ||
2814 | struct __do_is_swappable_with_impl | |
2815 | { | |
2816 | template<typename _Tp, typename _Up, typename | |
2817 | = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), | |
2818 | typename | |
2819 | = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> | |
2820 | static true_type __test(int); | |
2821 | ||
2822 | template<typename, typename> | |
2823 | static false_type __test(...); | |
2824 | }; | |
2825 | ||
2826 | struct __do_is_nothrow_swappable_with_impl | |
2827 | { | |
2828 | template<typename _Tp, typename _Up> | |
2829 | static __bool_constant< | |
2830 | noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) | |
2831 | && | |
2832 | noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())) | |
2833 | > __test(int); | |
2834 | ||
2835 | template<typename, typename> | |
2836 | static false_type __test(...); | |
2837 | }; | |
2838 | ||
2839 | } // namespace __swappable_with_details | |
2840 | ||
2841 | template<typename _Tp, typename _Up> | |
2842 | struct __is_swappable_with_impl | |
2843 | : public __swappable_with_details::__do_is_swappable_with_impl | |
2844 | { | |
2845 | typedef decltype(__test<_Tp, _Up>(0)) type; | |
2846 | }; | |
2847 | ||
2848 | // Optimization for the homogenous lvalue case, not required: | |
2849 | template<typename _Tp> | |
2850 | struct __is_swappable_with_impl<_Tp&, _Tp&> | |
2851 | : public __swappable_details::__do_is_swappable_impl | |
2852 | { | |
2853 | typedef decltype(__test<_Tp&>(0)) type; | |
2854 | }; | |
2855 | ||
2856 | template<typename _Tp, typename _Up> | |
2857 | struct __is_nothrow_swappable_with_impl | |
2858 | : public __swappable_with_details::__do_is_nothrow_swappable_with_impl | |
2859 | { | |
2860 | typedef decltype(__test<_Tp, _Up>(0)) type; | |
2861 | }; | |
2862 | ||
2863 | // Optimization for the homogenous lvalue case, not required: | |
2864 | template<typename _Tp> | |
2865 | struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&> | |
2866 | : public __swappable_details::__do_is_nothrow_swappable_impl | |
2867 | { | |
2868 | typedef decltype(__test<_Tp&>(0)) type; | |
2869 | }; | |
6963c3b9 | 2870 | /// @endcond |
6b9539e2 DK |
2871 | |
2872 | /// is_swappable_with | |
2873 | template<typename _Tp, typename _Up> | |
2874 | struct is_swappable_with | |
2875 | : public __is_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2876 | { |
2877 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2878 | "first template argument must be a complete class or an unbounded array"); | |
2879 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2880 | "second template argument must be a complete class or an unbounded array"); | |
2881 | }; | |
6b9539e2 DK |
2882 | |
2883 | /// is_nothrow_swappable_with | |
2884 | template<typename _Tp, typename _Up> | |
2885 | struct is_nothrow_swappable_with | |
2886 | : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2887 | { |
2888 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2889 | "first template argument must be a complete class or an unbounded array"); | |
2890 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2891 | "second template argument must be a complete class or an unbounded array"); | |
2892 | }; | |
6b9539e2 DK |
2893 | |
2894 | #if __cplusplus >= 201402L | |
2895 | /// is_swappable_with_v | |
2896 | template<typename _Tp, typename _Up> | |
288695f7 DK |
2897 | _GLIBCXX17_INLINE constexpr bool is_swappable_with_v = |
2898 | is_swappable_with<_Tp, _Up>::value; | |
6b9539e2 DK |
2899 | |
2900 | /// is_nothrow_swappable_with_v | |
2901 | template<typename _Tp, typename _Up> | |
288695f7 | 2902 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v = |
6b9539e2 DK |
2903 | is_nothrow_swappable_with<_Tp, _Up>::value; |
2904 | #endif // __cplusplus >= 201402L | |
137422c8 | 2905 | |
42183d03 JW |
2906 | #endif// c++1z or gnu++11 |
2907 | ||
6963c3b9 JW |
2908 | /// @cond undocumented |
2909 | ||
7dcc645c | 2910 | // __is_invocable (std::is_invocable for C++11) |
42183d03 | 2911 | |
d91f618d JW |
2912 | // The primary template is used for invalid INVOKE expressions. |
2913 | template<typename _Result, typename _Ret, | |
2914 | bool = is_void<_Ret>::value, typename = void> | |
7dcc645c | 2915 | struct __is_invocable_impl : false_type { }; |
42183d03 | 2916 | |
d91f618d | 2917 | // Used for valid INVOKE and INVOKE<void> expressions. |
42183d03 | 2918 | template<typename _Result, typename _Ret> |
d91f618d JW |
2919 | struct __is_invocable_impl<_Result, _Ret, |
2920 | /* is_void<_Ret> = */ true, | |
2921 | __void_t<typename _Result::type>> | |
2922 | : true_type | |
42183d03 JW |
2923 | { }; |
2924 | ||
d91f618d JW |
2925 | #pragma GCC diagnostic push |
2926 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
2927 | // Used for INVOKE<R> expressions to check the implicit conversion to R. | |
2928 | template<typename _Result, typename _Ret> | |
2929 | struct __is_invocable_impl<_Result, _Ret, | |
2930 | /* is_void<_Ret> = */ false, | |
2931 | __void_t<typename _Result::type>> | |
2932 | { | |
2933 | private: | |
2934 | // The type of the INVOKE expression. | |
2935 | // Unlike declval, this doesn't add_rvalue_reference. | |
2936 | static typename _Result::type _S_get(); | |
2937 | ||
2938 | template<typename _Tp> | |
2939 | static void _S_conv(_Tp); | |
2940 | ||
2941 | // This overload is viable if INVOKE(f, args...) can convert to _Tp. | |
2942 | template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))> | |
2943 | static true_type | |
2944 | _S_test(int); | |
2945 | ||
2946 | template<typename _Tp> | |
2947 | static false_type | |
2948 | _S_test(...); | |
2949 | ||
2950 | public: | |
2951 | using type = decltype(_S_test<_Ret>(1)); | |
2952 | }; | |
2953 | #pragma GCC diagnostic pop | |
2954 | ||
7dcc645c JW |
2955 | template<typename _Fn, typename... _ArgTypes> |
2956 | struct __is_invocable | |
2957 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
42183d03 JW |
2958 | { }; |
2959 | ||
42183d03 JW |
2960 | template<typename _Fn, typename _Tp, typename... _Args> |
2961 | constexpr bool __call_is_nt(__invoke_memfun_ref) | |
2962 | { | |
2963 | using _Up = typename __inv_unwrap<_Tp>::type; | |
2964 | return noexcept((std::declval<_Up>().*std::declval<_Fn>())( | |
2965 | std::declval<_Args>()...)); | |
2966 | } | |
2967 | ||
2968 | template<typename _Fn, typename _Tp, typename... _Args> | |
2969 | constexpr bool __call_is_nt(__invoke_memfun_deref) | |
2970 | { | |
2971 | return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())( | |
2972 | std::declval<_Args>()...)); | |
2973 | } | |
2974 | ||
2975 | template<typename _Fn, typename _Tp> | |
2976 | constexpr bool __call_is_nt(__invoke_memobj_ref) | |
2977 | { | |
2978 | using _Up = typename __inv_unwrap<_Tp>::type; | |
2979 | return noexcept(std::declval<_Up>().*std::declval<_Fn>()); | |
2980 | } | |
2981 | ||
2982 | template<typename _Fn, typename _Tp> | |
2983 | constexpr bool __call_is_nt(__invoke_memobj_deref) | |
2984 | { | |
2985 | return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>()); | |
2986 | } | |
2987 | ||
2988 | template<typename _Fn, typename... _Args> | |
2989 | constexpr bool __call_is_nt(__invoke_other) | |
2990 | { | |
2991 | return noexcept(std::declval<_Fn>()(std::declval<_Args>()...)); | |
2992 | } | |
2993 | ||
7dcc645c | 2994 | template<typename _Result, typename _Fn, typename... _Args> |
42183d03 JW |
2995 | struct __call_is_nothrow |
2996 | : __bool_constant< | |
7dcc645c JW |
2997 | std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{}) |
2998 | > | |
42183d03 JW |
2999 | { }; |
3000 | ||
7dcc645c JW |
3001 | template<typename _Fn, typename... _Args> |
3002 | using __call_is_nothrow_ | |
3003 | = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>; | |
42183d03 | 3004 | |
7dcc645c JW |
3005 | // __is_nothrow_invocable (std::is_nothrow_invocable for C++11) |
3006 | template<typename _Fn, typename... _Args> | |
3007 | struct __is_nothrow_invocable | |
3008 | : __and_<__is_invocable<_Fn, _Args...>, | |
3009 | __call_is_nothrow_<_Fn, _Args...>>::type | |
42183d03 JW |
3010 | { }; |
3011 | ||
cc28d234 JW |
3012 | #pragma GCC diagnostic push |
3013 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
a73d2fa8 NDR |
3014 | struct __nonesuchbase {}; |
3015 | struct __nonesuch : private __nonesuchbase { | |
f524d5b3 VV |
3016 | ~__nonesuch() = delete; |
3017 | __nonesuch(__nonesuch const&) = delete; | |
3018 | void operator=(__nonesuch const&) = delete; | |
3019 | }; | |
cc28d234 | 3020 | #pragma GCC diagnostic pop |
6963c3b9 | 3021 | /// @endcond |
f524d5b3 | 3022 | |
e641ee43 | 3023 | #if __cplusplus >= 201703L |
7dcc645c JW |
3024 | # define __cpp_lib_is_invocable 201703 |
3025 | ||
3026 | /// std::invoke_result | |
3027 | template<typename _Functor, typename... _ArgTypes> | |
3028 | struct invoke_result | |
3029 | : public __invoke_result<_Functor, _ArgTypes...> | |
69f571ff AP |
3030 | { |
3031 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}), | |
3032 | "_Functor must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3033 | static_assert((std::__is_complete_or_unbounded( |
3034 | __type_identity<_ArgTypes>{}) && ...), | |
3035 | "each argument type must be a complete class or an unbounded array"); | |
69f571ff | 3036 | }; |
7dcc645c JW |
3037 | |
3038 | /// std::invoke_result_t | |
3039 | template<typename _Fn, typename... _Args> | |
3040 | using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; | |
42183d03 | 3041 | |
7dcc645c JW |
3042 | /// std::is_invocable |
3043 | template<typename _Fn, typename... _ArgTypes> | |
3044 | struct is_invocable | |
3045 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
608a080c AP |
3046 | { |
3047 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3048 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3049 | static_assert((std::__is_complete_or_unbounded( |
3050 | __type_identity<_ArgTypes>{}) && ...), | |
3051 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3052 | }; |
42183d03 | 3053 | |
7dcc645c JW |
3054 | /// std::is_invocable_r |
3055 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3056 | struct is_invocable_r | |
3057 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type | |
608a080c AP |
3058 | { |
3059 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3060 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3061 | static_assert((std::__is_complete_or_unbounded( |
3062 | __type_identity<_ArgTypes>{}) && ...), | |
3063 | "each argument type must be a complete class or an unbounded array"); | |
3064 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3065 | "_Ret must be a complete class or an unbounded array"); | |
608a080c | 3066 | }; |
42183d03 | 3067 | |
7dcc645c JW |
3068 | /// std::is_nothrow_invocable |
3069 | template<typename _Fn, typename... _ArgTypes> | |
3070 | struct is_nothrow_invocable | |
3071 | : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>, | |
608a080c AP |
3072 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
3073 | { | |
3074 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3075 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3076 | static_assert((std::__is_complete_or_unbounded( |
3077 | __type_identity<_ArgTypes>{}) && ...), | |
3078 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3079 | }; |
42183d03 | 3080 | |
6963c3b9 | 3081 | /// @cond undocumented |
c4b06e7f JW |
3082 | template<typename _Result, typename _Ret, typename = void> |
3083 | struct __is_nt_invocable_impl : false_type { }; | |
3084 | ||
3085 | template<typename _Result, typename _Ret> | |
3086 | struct __is_nt_invocable_impl<_Result, _Ret, | |
3087 | __void_t<typename _Result::type>> | |
91d01b33 | 3088 | : __or_<is_void<_Ret>, |
ce9f305e | 3089 | __is_nothrow_convertible<typename _Result::type, _Ret>> |
c4b06e7f | 3090 | { }; |
6963c3b9 | 3091 | /// @endcond |
c4b06e7f | 3092 | |
7dcc645c JW |
3093 | /// std::is_nothrow_invocable_r |
3094 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3095 | struct is_nothrow_invocable_r | |
c4b06e7f | 3096 | : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>, |
7dcc645c | 3097 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
69f571ff AP |
3098 | { |
3099 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3100 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3101 | static_assert((std::__is_complete_or_unbounded( |
3102 | __type_identity<_ArgTypes>{}) && ...), | |
3103 | "each argument type must be a complete class or an unbounded array"); | |
3104 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3105 | "_Ret must be a complete class or an unbounded array"); | |
69f571ff | 3106 | }; |
7dcc645c | 3107 | #endif // C++17 |
42183d03 | 3108 | |
e641ee43 | 3109 | #if __cplusplus >= 201703L |
068c8ac1 | 3110 | # define __cpp_lib_type_trait_variable_templates 201510L |
6963c3b9 | 3111 | /** |
da89dfc2 | 3112 | * @defgroup variable_templates Variable templates for type traits |
6963c3b9 JW |
3113 | * @ingroup metaprogramming |
3114 | * | |
da89dfc2 JW |
3115 | * Each variable `is_xxx_v<T>` is a boolean constant with the same value |
3116 | * as the `value` member of the corresponding type trait `is_xxx<T>`. | |
6963c3b9 | 3117 | * |
aba938d6 | 3118 | * @since C++17 unless noted otherwise. |
6963c3b9 JW |
3119 | */ |
3120 | ||
da89dfc2 | 3121 | /** |
6963c3b9 | 3122 | * @{ |
da89dfc2 | 3123 | * @ingroup variable_templates |
6963c3b9 | 3124 | */ |
137422c8 | 3125 | template <typename _Tp> |
288695f7 | 3126 | inline constexpr bool is_void_v = is_void<_Tp>::value; |
137422c8 | 3127 | template <typename _Tp> |
288695f7 | 3128 | inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; |
137422c8 | 3129 | template <typename _Tp> |
288695f7 | 3130 | inline constexpr bool is_integral_v = is_integral<_Tp>::value; |
137422c8 | 3131 | template <typename _Tp> |
288695f7 | 3132 | inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; |
137422c8 | 3133 | template <typename _Tp> |
288695f7 | 3134 | inline constexpr bool is_array_v = is_array<_Tp>::value; |
137422c8 | 3135 | template <typename _Tp> |
288695f7 | 3136 | inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; |
137422c8 | 3137 | template <typename _Tp> |
288695f7 DK |
3138 | inline constexpr bool is_lvalue_reference_v = |
3139 | is_lvalue_reference<_Tp>::value; | |
137422c8 | 3140 | template <typename _Tp> |
288695f7 DK |
3141 | inline constexpr bool is_rvalue_reference_v = |
3142 | is_rvalue_reference<_Tp>::value; | |
137422c8 | 3143 | template <typename _Tp> |
288695f7 | 3144 | inline constexpr bool is_member_object_pointer_v = |
137422c8 VV |
3145 | is_member_object_pointer<_Tp>::value; |
3146 | template <typename _Tp> | |
288695f7 | 3147 | inline constexpr bool is_member_function_pointer_v = |
137422c8 VV |
3148 | is_member_function_pointer<_Tp>::value; |
3149 | template <typename _Tp> | |
288695f7 | 3150 | inline constexpr bool is_enum_v = is_enum<_Tp>::value; |
137422c8 | 3151 | template <typename _Tp> |
288695f7 | 3152 | inline constexpr bool is_union_v = is_union<_Tp>::value; |
137422c8 | 3153 | template <typename _Tp> |
288695f7 | 3154 | inline constexpr bool is_class_v = is_class<_Tp>::value; |
137422c8 | 3155 | template <typename _Tp> |
288695f7 | 3156 | inline constexpr bool is_function_v = is_function<_Tp>::value; |
137422c8 | 3157 | template <typename _Tp> |
288695f7 | 3158 | inline constexpr bool is_reference_v = is_reference<_Tp>::value; |
137422c8 | 3159 | template <typename _Tp> |
288695f7 | 3160 | inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; |
137422c8 | 3161 | template <typename _Tp> |
288695f7 | 3162 | inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; |
137422c8 | 3163 | template <typename _Tp> |
288695f7 | 3164 | inline constexpr bool is_object_v = is_object<_Tp>::value; |
137422c8 | 3165 | template <typename _Tp> |
288695f7 | 3166 | inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; |
137422c8 | 3167 | template <typename _Tp> |
288695f7 | 3168 | inline constexpr bool is_compound_v = is_compound<_Tp>::value; |
137422c8 | 3169 | template <typename _Tp> |
288695f7 | 3170 | inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; |
137422c8 | 3171 | template <typename _Tp> |
288695f7 | 3172 | inline constexpr bool is_const_v = is_const<_Tp>::value; |
137422c8 | 3173 | template <typename _Tp> |
288695f7 | 3174 | inline constexpr bool is_volatile_v = is_volatile<_Tp>::value; |
137422c8 | 3175 | template <typename _Tp> |
288695f7 | 3176 | inline constexpr bool is_trivial_v = is_trivial<_Tp>::value; |
137422c8 | 3177 | template <typename _Tp> |
288695f7 DK |
3178 | inline constexpr bool is_trivially_copyable_v = |
3179 | is_trivially_copyable<_Tp>::value; | |
137422c8 | 3180 | template <typename _Tp> |
288695f7 | 3181 | inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value; |
caa39b2e JW |
3182 | #pragma GCC diagnostic push |
3183 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
137422c8 | 3184 | template <typename _Tp> |
1a6c5064 | 3185 | _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead") |
288695f7 | 3186 | inline constexpr bool is_pod_v = is_pod<_Tp>::value; |
137422c8 | 3187 | template <typename _Tp> |
24b54628 | 3188 | _GLIBCXX17_DEPRECATED |
288695f7 | 3189 | inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value; |
24b54628 VV |
3190 | #pragma GCC diagnostic pop |
3191 | template <typename _Tp> | |
288695f7 | 3192 | inline constexpr bool is_empty_v = is_empty<_Tp>::value; |
137422c8 | 3193 | template <typename _Tp> |
288695f7 | 3194 | inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value; |
137422c8 | 3195 | template <typename _Tp> |
288695f7 | 3196 | inline constexpr bool is_abstract_v = is_abstract<_Tp>::value; |
137422c8 | 3197 | template <typename _Tp> |
288695f7 | 3198 | inline constexpr bool is_final_v = is_final<_Tp>::value; |
137422c8 | 3199 | template <typename _Tp> |
288695f7 | 3200 | inline constexpr bool is_signed_v = is_signed<_Tp>::value; |
137422c8 | 3201 | template <typename _Tp> |
288695f7 | 3202 | inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; |
137422c8 | 3203 | template <typename _Tp, typename... _Args> |
288695f7 DK |
3204 | inline constexpr bool is_constructible_v = |
3205 | is_constructible<_Tp, _Args...>::value; | |
137422c8 | 3206 | template <typename _Tp> |
288695f7 | 3207 | inline constexpr bool is_default_constructible_v = |
137422c8 VV |
3208 | is_default_constructible<_Tp>::value; |
3209 | template <typename _Tp> | |
288695f7 DK |
3210 | inline constexpr bool is_copy_constructible_v = |
3211 | is_copy_constructible<_Tp>::value; | |
137422c8 | 3212 | template <typename _Tp> |
288695f7 DK |
3213 | inline constexpr bool is_move_constructible_v = |
3214 | is_move_constructible<_Tp>::value; | |
137422c8 | 3215 | template <typename _Tp, typename _Up> |
288695f7 | 3216 | inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value; |
137422c8 | 3217 | template <typename _Tp> |
288695f7 | 3218 | inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value; |
137422c8 | 3219 | template <typename _Tp> |
288695f7 | 3220 | inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value; |
137422c8 | 3221 | template <typename _Tp> |
288695f7 | 3222 | inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; |
137422c8 | 3223 | template <typename _Tp, typename... _Args> |
288695f7 | 3224 | inline constexpr bool is_trivially_constructible_v = |
137422c8 VV |
3225 | is_trivially_constructible<_Tp, _Args...>::value; |
3226 | template <typename _Tp> | |
288695f7 | 3227 | inline constexpr bool is_trivially_default_constructible_v = |
137422c8 VV |
3228 | is_trivially_default_constructible<_Tp>::value; |
3229 | template <typename _Tp> | |
288695f7 | 3230 | inline constexpr bool is_trivially_copy_constructible_v = |
137422c8 VV |
3231 | is_trivially_copy_constructible<_Tp>::value; |
3232 | template <typename _Tp> | |
288695f7 | 3233 | inline constexpr bool is_trivially_move_constructible_v = |
137422c8 VV |
3234 | is_trivially_move_constructible<_Tp>::value; |
3235 | template <typename _Tp, typename _Up> | |
288695f7 | 3236 | inline constexpr bool is_trivially_assignable_v = |
137422c8 VV |
3237 | is_trivially_assignable<_Tp, _Up>::value; |
3238 | template <typename _Tp> | |
288695f7 | 3239 | inline constexpr bool is_trivially_copy_assignable_v = |
137422c8 VV |
3240 | is_trivially_copy_assignable<_Tp>::value; |
3241 | template <typename _Tp> | |
288695f7 | 3242 | inline constexpr bool is_trivially_move_assignable_v = |
137422c8 VV |
3243 | is_trivially_move_assignable<_Tp>::value; |
3244 | template <typename _Tp> | |
288695f7 | 3245 | inline constexpr bool is_trivially_destructible_v = |
137422c8 VV |
3246 | is_trivially_destructible<_Tp>::value; |
3247 | template <typename _Tp, typename... _Args> | |
288695f7 | 3248 | inline constexpr bool is_nothrow_constructible_v = |
137422c8 VV |
3249 | is_nothrow_constructible<_Tp, _Args...>::value; |
3250 | template <typename _Tp> | |
288695f7 | 3251 | inline constexpr bool is_nothrow_default_constructible_v = |
137422c8 VV |
3252 | is_nothrow_default_constructible<_Tp>::value; |
3253 | template <typename _Tp> | |
288695f7 | 3254 | inline constexpr bool is_nothrow_copy_constructible_v = |
137422c8 VV |
3255 | is_nothrow_copy_constructible<_Tp>::value; |
3256 | template <typename _Tp> | |
288695f7 | 3257 | inline constexpr bool is_nothrow_move_constructible_v = |
137422c8 VV |
3258 | is_nothrow_move_constructible<_Tp>::value; |
3259 | template <typename _Tp, typename _Up> | |
288695f7 | 3260 | inline constexpr bool is_nothrow_assignable_v = |
137422c8 VV |
3261 | is_nothrow_assignable<_Tp, _Up>::value; |
3262 | template <typename _Tp> | |
288695f7 | 3263 | inline constexpr bool is_nothrow_copy_assignable_v = |
137422c8 VV |
3264 | is_nothrow_copy_assignable<_Tp>::value; |
3265 | template <typename _Tp> | |
288695f7 | 3266 | inline constexpr bool is_nothrow_move_assignable_v = |
137422c8 VV |
3267 | is_nothrow_move_assignable<_Tp>::value; |
3268 | template <typename _Tp> | |
288695f7 | 3269 | inline constexpr bool is_nothrow_destructible_v = |
137422c8 VV |
3270 | is_nothrow_destructible<_Tp>::value; |
3271 | template <typename _Tp> | |
288695f7 | 3272 | inline constexpr bool has_virtual_destructor_v = |
137422c8 VV |
3273 | has_virtual_destructor<_Tp>::value; |
3274 | template <typename _Tp> | |
288695f7 | 3275 | inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; |
137422c8 | 3276 | template <typename _Tp> |
288695f7 | 3277 | inline constexpr size_t rank_v = rank<_Tp>::value; |
137422c8 | 3278 | template <typename _Tp, unsigned _Idx = 0> |
288695f7 | 3279 | inline constexpr size_t extent_v = extent<_Tp, _Idx>::value; |
73ae6eb5 | 3280 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
137422c8 | 3281 | template <typename _Tp, typename _Up> |
73ae6eb5 | 3282 | inline constexpr bool is_same_v = __is_same(_Tp, _Up); |
44af818f JW |
3283 | #else |
3284 | template <typename _Tp, typename _Up> | |
3285 | inline constexpr bool is_same_v = std::is_same<_Tp, _Up>::value; | |
3286 | #endif | |
137422c8 | 3287 | template <typename _Base, typename _Derived> |
288695f7 | 3288 | inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value; |
137422c8 | 3289 | template <typename _From, typename _To> |
288695f7 | 3290 | inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; |
6963c3b9 JW |
3291 | template<typename _Fn, typename... _Args> |
3292 | inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; | |
3293 | template<typename _Fn, typename... _Args> | |
3294 | inline constexpr bool is_nothrow_invocable_v | |
3295 | = is_nothrow_invocable<_Fn, _Args...>::value; | |
3296 | template<typename _Ret, typename _Fn, typename... _Args> | |
3297 | inline constexpr bool is_invocable_r_v | |
3298 | = is_invocable_r<_Ret, _Fn, _Args...>::value; | |
3299 | template<typename _Ret, typename _Fn, typename... _Args> | |
3300 | inline constexpr bool is_nothrow_invocable_r_v | |
3301 | = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; | |
3302 | /// @} | |
873c7d5a | 3303 | |
2d763763 | 3304 | #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP |
873c7d5a JW |
3305 | # define __cpp_lib_has_unique_object_representations 201606 |
3306 | /// has_unique_object_representations | |
aba938d6 | 3307 | /// @since C++17 |
873c7d5a JW |
3308 | template<typename _Tp> |
3309 | struct has_unique_object_representations | |
3310 | : bool_constant<__has_unique_object_representations( | |
3311 | remove_cv_t<remove_all_extents_t<_Tp>> | |
3312 | )> | |
608a080c AP |
3313 | { |
3314 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
3315 | "template argument must be a complete class or an unbounded array"); | |
3316 | }; | |
b0e63d94 | 3317 | |
6963c3b9 | 3318 | /// @ingroup variable_templates |
b0e63d94 JW |
3319 | template<typename _Tp> |
3320 | inline constexpr bool has_unique_object_representations_v | |
3321 | = has_unique_object_representations<_Tp>::value; | |
1f5700e9 | 3322 | #endif |
e2ac6765 | 3323 | |
afa56c17 | 3324 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE |
ff273400 | 3325 | # define __cpp_lib_is_aggregate 201703 |
e2ac6765 | 3326 | /// is_aggregate |
aba938d6 | 3327 | /// @since C++17 |
e2ac6765 VV |
3328 | template<typename _Tp> |
3329 | struct is_aggregate | |
608a080c | 3330 | : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> |
209ee624 | 3331 | { }; |
e2ac6765 | 3332 | |
6963c3b9 | 3333 | /// @ingroup variable_templates |
e2ac6765 VV |
3334 | template<typename _Tp> |
3335 | inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value; | |
3336 | #endif | |
137422c8 | 3337 | #endif // C++17 |
6b9539e2 | 3338 | |
aba938d6 JW |
3339 | #if __cplusplus >= 202002L |
3340 | ||
3341 | /** * Remove references and cv-qualifiers. | |
3342 | * @since C++20 | |
3343 | * @{ | |
3344 | */ | |
56772f62 JW |
3345 | #define __cpp_lib_remove_cvref 201711L |
3346 | ||
6791489e JW |
3347 | template<typename _Tp> |
3348 | struct remove_cvref | |
0e79e630 JW |
3349 | : remove_cv<_Tp> |
3350 | { }; | |
3351 | ||
3352 | template<typename _Tp> | |
3353 | struct remove_cvref<_Tp&> | |
3354 | : remove_cv<_Tp> | |
3355 | { }; | |
3356 | ||
3357 | template<typename _Tp> | |
3358 | struct remove_cvref<_Tp&&> | |
3359 | : remove_cv<_Tp> | |
3360 | { }; | |
6791489e JW |
3361 | |
3362 | template<typename _Tp> | |
0e79e630 | 3363 | using remove_cvref_t = typename remove_cvref<_Tp>::type; |
aba938d6 | 3364 | /// @} |
6791489e | 3365 | |
aba938d6 JW |
3366 | /** * Identity metafunction. |
3367 | * @since C++20 | |
3368 | * @{ | |
3369 | */ | |
56772f62 | 3370 | #define __cpp_lib_type_identity 201806L |
ee896276 JW |
3371 | template<typename _Tp> |
3372 | struct type_identity { using type = _Tp; }; | |
3373 | ||
3374 | template<typename _Tp> | |
3375 | using type_identity_t = typename type_identity<_Tp>::type; | |
aba938d6 | 3376 | /// @} |
ee896276 | 3377 | |
bb54e0b8 JW |
3378 | #define __cpp_lib_unwrap_ref 201811L |
3379 | ||
aba938d6 JW |
3380 | /** Unwrap a reference_wrapper |
3381 | * @since C++20 | |
3382 | * @{ | |
3383 | */ | |
3d18dc9d JW |
3384 | template<typename _Tp> |
3385 | struct unwrap_reference { using type = _Tp; }; | |
3386 | ||
3387 | template<typename _Tp> | |
3388 | struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; }; | |
3389 | ||
82e8c3da JW |
3390 | template<typename _Tp> |
3391 | using unwrap_reference_t = typename unwrap_reference<_Tp>::type; | |
aba938d6 | 3392 | /// @} |
82e8c3da | 3393 | |
aba938d6 JW |
3394 | /** Decay type and if it's a reference_wrapper, unwrap it |
3395 | * @since C++20 | |
3396 | * @{ | |
3397 | */ | |
3d18dc9d | 3398 | template<typename _Tp> |
82e8c3da | 3399 | struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; }; |
3d18dc9d JW |
3400 | |
3401 | template<typename _Tp> | |
3402 | using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type; | |
aba938d6 | 3403 | /// @} |
3d18dc9d | 3404 | |
46610940 JW |
3405 | #define __cpp_lib_bounded_array_traits 201902L |
3406 | ||
28d85efb | 3407 | /// True for a type that is an array of known bound. |
aba938d6 | 3408 | /// @since C++20 |
28d85efb JW |
3409 | template<typename _Tp> |
3410 | struct is_bounded_array | |
3411 | : public __is_array_known_bounds<_Tp> | |
3412 | { }; | |
3413 | ||
3414 | /// True for a type that is an array of unknown bound. | |
aba938d6 | 3415 | /// @since C++20 |
28d85efb JW |
3416 | template<typename _Tp> |
3417 | struct is_unbounded_array | |
3418 | : public __is_array_unknown_bounds<_Tp> | |
3419 | { }; | |
3420 | ||
6963c3b9 | 3421 | /// @ingroup variable_templates |
aba938d6 | 3422 | /// @since C++20 |
28d85efb JW |
3423 | template<typename _Tp> |
3424 | inline constexpr bool is_bounded_array_v | |
3425 | = is_bounded_array<_Tp>::value; | |
3426 | ||
6963c3b9 | 3427 | /// @ingroup variable_templates |
aba938d6 | 3428 | /// @since C++20 |
28d85efb JW |
3429 | template<typename _Tp> |
3430 | inline constexpr bool is_unbounded_array_v | |
3431 | = is_unbounded_array<_Tp>::value; | |
3432 | ||
037ef219 JW |
3433 | #if __has_builtin(__is_layout_compatible) |
3434 | ||
3435 | /// @since C++20 | |
3436 | template<typename _Tp, typename _Up> | |
3437 | struct is_layout_compatible | |
3438 | : bool_constant<__is_layout_compatible(_Tp, _Up)> | |
3439 | { }; | |
3440 | ||
3441 | /// @ingroup variable_templates | |
3442 | /// @since C++20 | |
3443 | template<typename _Tp, typename _Up> | |
3444 | constexpr bool is_layout_compatible_v | |
3445 | = __is_layout_compatible(_Tp, _Up); | |
3446 | ||
3447 | #if __has_builtin(__builtin_is_corresponding_member) | |
3448 | #define __cpp_lib_is_layout_compatible 201907L | |
3449 | ||
3450 | /// @since C++20 | |
3451 | template<typename _S1, typename _S2, typename _M1, typename _M2> | |
3452 | constexpr bool | |
3453 | is_corresponding_member(_M1 _S1::*__m1, _M2 _S2::*__m2) noexcept | |
3454 | { return __builtin_is_corresponding_member(__m1, __m2); } | |
3455 | #endif | |
3456 | #endif | |
3457 | ||
4fa6c0ec JW |
3458 | #if __has_builtin(__is_pointer_interconvertible_base_of) |
3459 | /// True if `_Derived` is standard-layout and has a base class of type `_Base` | |
3460 | /// @since C++20 | |
3461 | template<typename _Base, typename _Derived> | |
3462 | struct is_pointer_interconvertible_base_of | |
3463 | : bool_constant<__is_pointer_interconvertible_base_of(_Base, _Derived)> | |
3464 | { }; | |
3465 | ||
3466 | /// @ingroup variable_templates | |
3467 | /// @since C++20 | |
3468 | template<typename _Base, typename _Derived> | |
3469 | constexpr bool is_pointer_interconvertible_base_of_v | |
3470 | = __is_pointer_interconvertible_base_of(_Base, _Derived); | |
3471 | ||
3472 | #if __has_builtin(__builtin_is_pointer_interconvertible_with_class) | |
3473 | #define __cpp_lib_is_pointer_interconvertible 201907L | |
3474 | ||
3475 | /// True if `__mp` points to the first member of a standard-layout type | |
3476 | /// @returns true if `s.*__mp` is pointer-interconvertible with `s` | |
3477 | /// @since C++20 | |
3478 | template<typename _Tp, typename _Mem> | |
3479 | constexpr bool | |
3480 | is_pointer_interconvertible_with_class(_Mem _Tp::*__mp) noexcept | |
3481 | { return __builtin_is_pointer_interconvertible_with_class(__mp); } | |
3482 | #endif | |
3483 | #endif | |
3484 | ||
b8ecdc77 JW |
3485 | #if __cplusplus > 202002L |
3486 | #define __cpp_lib_is_scoped_enum 202011L | |
3487 | ||
aba938d6 | 3488 | /// True if the type is a scoped enumeration type. |
6963c3b9 | 3489 | /// @since C++23 |
6963c3b9 | 3490 | |
b8ecdc77 JW |
3491 | template<typename _Tp> |
3492 | struct is_scoped_enum | |
3493 | : false_type | |
3494 | { }; | |
3495 | ||
43ab1dc2 JW |
3496 | template<typename _Tp> |
3497 | requires __is_enum(_Tp) | |
3498 | && requires(_Tp __t) { __t = __t; } // fails if incomplete | |
b8ecdc77 | 3499 | struct is_scoped_enum<_Tp> |
43ab1dc2 JW |
3500 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> |
3501 | { }; | |
3502 | ||
3503 | // FIXME remove this partial specialization and use remove_cv_t<_Tp> above | |
3504 | // when PR c++/99968 is fixed. | |
3505 | template<typename _Tp> | |
3506 | requires __is_enum(_Tp) | |
3507 | && requires(_Tp __t) { __t = __t; } // fails if incomplete | |
3508 | struct is_scoped_enum<const _Tp> | |
3509 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> | |
b8ecdc77 JW |
3510 | { }; |
3511 | ||
aba938d6 JW |
3512 | /// @ingroup variable_templates |
3513 | /// @since C++23 | |
b8ecdc77 JW |
3514 | template<typename _Tp> |
3515 | inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; | |
aba938d6 | 3516 | |
b8ecdc77 JW |
3517 | #endif // C++23 |
3518 | ||
0d7924f2 | 3519 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED |
134a6f7b | 3520 | |
8aa1550e | 3521 | #define __cpp_lib_is_constant_evaluated 201811L |
134a6f7b | 3522 | |
6963c3b9 | 3523 | /// Returns true only when called during constant evaluation. |
aba938d6 | 3524 | /// @since C++20 |
0d7924f2 JJ |
3525 | constexpr inline bool |
3526 | is_constant_evaluated() noexcept | |
3527 | { return __builtin_is_constant_evaluated(); } | |
3528 | #endif | |
3529 | ||
6963c3b9 | 3530 | /// @cond undocumented |
0f8b14ee JW |
3531 | template<typename _From, typename _To> |
3532 | using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type; | |
3533 | ||
3534 | template<typename _Xp, typename _Yp> | |
3535 | using __cond_res | |
3536 | = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); | |
3537 | ||
3538 | template<typename _Ap, typename _Bp, typename = void> | |
3539 | struct __common_ref_impl | |
3540 | { }; | |
3541 | ||
3542 | // [meta.trans.other], COMMON-REF(A, B) | |
3543 | template<typename _Ap, typename _Bp> | |
3544 | using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type; | |
3545 | ||
c37b5ddc JW |
3546 | // COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &) |
3547 | template<typename _Xp, typename _Yp> | |
3548 | using __condres_cvref | |
3549 | = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; | |
3550 | ||
0f8b14ee JW |
3551 | // If A and B are both lvalue reference types, ... |
3552 | template<typename _Xp, typename _Yp> | |
c37b5ddc JW |
3553 | struct __common_ref_impl<_Xp&, _Yp&, __void_t<__condres_cvref<_Xp, _Yp>>> |
3554 | : enable_if<is_reference_v<__condres_cvref<_Xp, _Yp>>, | |
3555 | __condres_cvref<_Xp, _Yp>> | |
3556 | { }; | |
0f8b14ee JW |
3557 | |
3558 | // let C be remove_reference_t<COMMON-REF(X&, Y&)>&& | |
3559 | template<typename _Xp, typename _Yp> | |
3560 | using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&; | |
3561 | ||
3562 | // If A and B are both rvalue reference types, ... | |
3563 | template<typename _Xp, typename _Yp> | |
3564 | struct __common_ref_impl<_Xp&&, _Yp&&, | |
3565 | _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>, | |
3566 | is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>> | |
3567 | { using type = __common_ref_C<_Xp, _Yp>; }; | |
3568 | ||
3569 | // let D be COMMON-REF(const X&, Y&) | |
3570 | template<typename _Xp, typename _Yp> | |
3571 | using __common_ref_D = __common_ref<const _Xp&, _Yp&>; | |
3572 | ||
3573 | // If A is an rvalue reference and B is an lvalue reference, ... | |
3574 | template<typename _Xp, typename _Yp> | |
3575 | struct __common_ref_impl<_Xp&&, _Yp&, | |
3576 | _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>> | |
3577 | { using type = __common_ref_D<_Xp, _Yp>; }; | |
3578 | ||
3579 | // If A is an lvalue reference and B is an rvalue reference, ... | |
3580 | template<typename _Xp, typename _Yp> | |
3581 | struct __common_ref_impl<_Xp&, _Yp&&> | |
3582 | : __common_ref_impl<_Yp&&, _Xp&> | |
3583 | { }; | |
6963c3b9 | 3584 | /// @endcond |
0f8b14ee JW |
3585 | |
3586 | template<typename _Tp, typename _Up, | |
3587 | template<typename> class _TQual, template<typename> class _UQual> | |
3588 | struct basic_common_reference | |
3589 | { }; | |
3590 | ||
6963c3b9 | 3591 | /// @cond undocumented |
0f8b14ee JW |
3592 | template<typename _Tp> |
3593 | struct __xref | |
3594 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; }; | |
3595 | ||
3596 | template<typename _Tp> | |
3597 | struct __xref<_Tp&> | |
3598 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&; }; | |
3599 | ||
3600 | template<typename _Tp> | |
3601 | struct __xref<_Tp&&> | |
3602 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&&; }; | |
3603 | ||
3604 | template<typename _Tp1, typename _Tp2> | |
3605 | using __basic_common_ref | |
3606 | = typename basic_common_reference<remove_cvref_t<_Tp1>, | |
3607 | remove_cvref_t<_Tp2>, | |
3608 | __xref<_Tp1>::template __type, | |
3609 | __xref<_Tp2>::template __type>::type; | |
6963c3b9 | 3610 | /// @endcond |
0f8b14ee JW |
3611 | |
3612 | template<typename... _Tp> | |
3613 | struct common_reference; | |
3614 | ||
3615 | template<typename... _Tp> | |
3616 | using common_reference_t = typename common_reference<_Tp...>::type; | |
3617 | ||
3618 | // If sizeof...(T) is zero, there shall be no member type. | |
3619 | template<> | |
3620 | struct common_reference<> | |
3621 | { }; | |
3622 | ||
3623 | // If sizeof...(T) is one ... | |
3624 | template<typename _Tp0> | |
3625 | struct common_reference<_Tp0> | |
3626 | { using type = _Tp0; }; | |
3627 | ||
6963c3b9 | 3628 | /// @cond undocumented |
0f8b14ee JW |
3629 | template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void> |
3630 | struct __common_reference_impl | |
3631 | : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1> | |
3632 | { }; | |
3633 | ||
3634 | // If sizeof...(T) is two ... | |
3635 | template<typename _Tp1, typename _Tp2> | |
3636 | struct common_reference<_Tp1, _Tp2> | |
3637 | : __common_reference_impl<_Tp1, _Tp2> | |
3638 | { }; | |
3639 | ||
3640 | // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ... | |
3641 | template<typename _Tp1, typename _Tp2> | |
3642 | struct __common_reference_impl<_Tp1&, _Tp2&, 1, | |
3643 | void_t<__common_ref<_Tp1&, _Tp2&>>> | |
3644 | { using type = __common_ref<_Tp1&, _Tp2&>; }; | |
3645 | ||
3646 | template<typename _Tp1, typename _Tp2> | |
3647 | struct __common_reference_impl<_Tp1&&, _Tp2&&, 1, | |
3648 | void_t<__common_ref<_Tp1&&, _Tp2&&>>> | |
3649 | { using type = __common_ref<_Tp1&&, _Tp2&&>; }; | |
3650 | ||
3651 | template<typename _Tp1, typename _Tp2> | |
3652 | struct __common_reference_impl<_Tp1&, _Tp2&&, 1, | |
3653 | void_t<__common_ref<_Tp1&, _Tp2&&>>> | |
3654 | { using type = __common_ref<_Tp1&, _Tp2&&>; }; | |
3655 | ||
3656 | template<typename _Tp1, typename _Tp2> | |
3657 | struct __common_reference_impl<_Tp1&&, _Tp2&, 1, | |
3658 | void_t<__common_ref<_Tp1&&, _Tp2&>>> | |
3659 | { using type = __common_ref<_Tp1&&, _Tp2&>; }; | |
3660 | ||
3661 | // Otherwise, if basic_common_reference<...>::type is well-formed, ... | |
3662 | template<typename _Tp1, typename _Tp2> | |
3663 | struct __common_reference_impl<_Tp1, _Tp2, 2, | |
3664 | void_t<__basic_common_ref<_Tp1, _Tp2>>> | |
3665 | { using type = __basic_common_ref<_Tp1, _Tp2>; }; | |
3666 | ||
3667 | // Otherwise, if COND-RES(T1, T2) is well-formed, ... | |
3668 | template<typename _Tp1, typename _Tp2> | |
3669 | struct __common_reference_impl<_Tp1, _Tp2, 3, | |
3670 | void_t<__cond_res<_Tp1, _Tp2>>> | |
3671 | { using type = __cond_res<_Tp1, _Tp2>; }; | |
3672 | ||
3673 | // Otherwise, if common_type_t<T1, T2> is well-formed, ... | |
3674 | template<typename _Tp1, typename _Tp2> | |
3675 | struct __common_reference_impl<_Tp1, _Tp2, 4, | |
3676 | void_t<common_type_t<_Tp1, _Tp2>>> | |
3677 | { using type = common_type_t<_Tp1, _Tp2>; }; | |
3678 | ||
3679 | // Otherwise, there shall be no member type. | |
3680 | template<typename _Tp1, typename _Tp2> | |
3681 | struct __common_reference_impl<_Tp1, _Tp2, 5, void> | |
3682 | { }; | |
3683 | ||
3684 | // Otherwise, if sizeof...(T) is greater than two, ... | |
3685 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3686 | struct common_reference<_Tp1, _Tp2, _Rest...> | |
3687 | : __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3688 | __common_type_pack<_Rest...>> | |
3689 | { }; | |
3690 | ||
3691 | // Reuse __common_type_fold for common_reference<T1, T2, Rest...> | |
3692 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3693 | struct __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3694 | __common_type_pack<_Rest...>, | |
3695 | void_t<common_reference_t<_Tp1, _Tp2>>> | |
3696 | : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...> | |
3697 | { }; | |
6963c3b9 | 3698 | /// @endcond |
0f8b14ee | 3699 | |
e641ee43 JW |
3700 | #endif // C++2a |
3701 | ||
6963c3b9 JW |
3702 | /// @} group metaprogramming |
3703 | ||
12ffa228 | 3704 | _GLIBCXX_END_NAMESPACE_VERSION |
c0ffa2ba | 3705 | } // namespace std |
7b50cdef | 3706 | |
734f5023 | 3707 | #endif // C++11 |
57317d2a | 3708 | |
7274deff | 3709 | #endif // _GLIBCXX_TYPE_TRAITS |