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c0ffa2ba | 1 | // C++11 <type_traits> -*- C++ -*- |
af13a7a6 | 2 | |
7adcbafe | 3 | // Copyright (C) 2007-2022 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 | 69 | |
b8806796 | 70 | #define __cpp_lib_integral_constant_callable 201304L |
a15f7cb8 | 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 |
b8806796 | 94 | # define __cpp_lib_bool_constant 201505L |
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 | |
b8806796 | 191 | #define __cpp_lib_logical_traits 201510L |
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, | |
4bdb9d61 | 312 | // so don't check _GLIBCXX_USE_WCHAR_T here. |
123c516a PC |
313 | template<> |
314 | struct __is_integral_helper<wchar_t> | |
315 | : public true_type { }; | |
123c516a | 316 | |
c124af93 TH |
317 | #ifdef _GLIBCXX_USE_CHAR8_T |
318 | template<> | |
319 | struct __is_integral_helper<char8_t> | |
320 | : public true_type { }; | |
321 | #endif | |
322 | ||
123c516a PC |
323 | template<> |
324 | struct __is_integral_helper<char16_t> | |
325 | : public true_type { }; | |
326 | ||
327 | template<> | |
328 | struct __is_integral_helper<char32_t> | |
329 | : public true_type { }; | |
330 | ||
331 | template<> | |
332 | struct __is_integral_helper<short> | |
333 | : public true_type { }; | |
334 | ||
335 | template<> | |
336 | struct __is_integral_helper<unsigned short> | |
337 | : public true_type { }; | |
338 | ||
339 | template<> | |
340 | struct __is_integral_helper<int> | |
341 | : public true_type { }; | |
342 | ||
343 | template<> | |
344 | struct __is_integral_helper<unsigned int> | |
345 | : public true_type { }; | |
346 | ||
347 | template<> | |
348 | struct __is_integral_helper<long> | |
349 | : public true_type { }; | |
350 | ||
351 | template<> | |
352 | struct __is_integral_helper<unsigned long> | |
353 | : public true_type { }; | |
354 | ||
355 | template<> | |
356 | struct __is_integral_helper<long long> | |
357 | : public true_type { }; | |
358 | ||
359 | template<> | |
360 | struct __is_integral_helper<unsigned long long> | |
361 | : public true_type { }; | |
53dc5044 | 362 | |
78a7c317 DD |
363 | // Conditionalizing on __STRICT_ANSI__ here will break any port that |
364 | // uses one of these types for size_t. | |
365 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
42167831 | 366 | __extension__ |
6d585f01 | 367 | template<> |
78a7c317 | 368 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> |
6d585f01 PC |
369 | : public true_type { }; |
370 | ||
42167831 | 371 | __extension__ |
6d585f01 | 372 | template<> |
78a7c317 DD |
373 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> |
374 | : public true_type { }; | |
375 | #endif | |
376 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 377 | __extension__ |
78a7c317 DD |
378 | template<> |
379 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> | |
380 | : public true_type { }; | |
381 | ||
42167831 | 382 | __extension__ |
78a7c317 DD |
383 | template<> |
384 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> | |
385 | : public true_type { }; | |
386 | #endif | |
387 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 388 | __extension__ |
78a7c317 DD |
389 | template<> |
390 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> | |
391 | : public true_type { }; | |
392 | ||
42167831 | 393 | __extension__ |
78a7c317 DD |
394 | template<> |
395 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> | |
396 | : public true_type { }; | |
397 | #endif | |
398 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 399 | __extension__ |
78a7c317 DD |
400 | template<> |
401 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> | |
402 | : public true_type { }; | |
403 | ||
42167831 | 404 | __extension__ |
78a7c317 DD |
405 | template<> |
406 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> | |
6d585f01 PC |
407 | : public true_type { }; |
408 | #endif | |
6963c3b9 | 409 | /// @endcond |
6d585f01 | 410 | |
53dc5044 PC |
411 | /// is_integral |
412 | template<typename _Tp> | |
413 | struct is_integral | |
391d5d2e | 414 | : public __is_integral_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
415 | { }; |
416 | ||
6963c3b9 | 417 | /// @cond undocumented |
53dc5044 PC |
418 | template<typename> |
419 | struct __is_floating_point_helper | |
420 | : public false_type { }; | |
123c516a PC |
421 | |
422 | template<> | |
423 | struct __is_floating_point_helper<float> | |
424 | : public true_type { }; | |
425 | ||
426 | template<> | |
427 | struct __is_floating_point_helper<double> | |
428 | : public true_type { }; | |
429 | ||
430 | template<> | |
431 | struct __is_floating_point_helper<long double> | |
432 | : public true_type { }; | |
53dc5044 | 433 | |
6d585f01 PC |
434 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
435 | template<> | |
436 | struct __is_floating_point_helper<__float128> | |
437 | : public true_type { }; | |
438 | #endif | |
6963c3b9 | 439 | /// @endcond |
6d585f01 | 440 | |
53dc5044 PC |
441 | /// is_floating_point |
442 | template<typename _Tp> | |
443 | struct is_floating_point | |
391d5d2e | 444 | : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
445 | { }; |
446 | ||
447 | /// is_array | |
448 | template<typename> | |
449 | struct is_array | |
450 | : public false_type { }; | |
451 | ||
452 | template<typename _Tp, std::size_t _Size> | |
453 | struct is_array<_Tp[_Size]> | |
454 | : public true_type { }; | |
455 | ||
456 | template<typename _Tp> | |
457 | struct is_array<_Tp[]> | |
458 | : public true_type { }; | |
459 | ||
460 | template<typename> | |
461 | struct __is_pointer_helper | |
462 | : public false_type { }; | |
123c516a PC |
463 | |
464 | template<typename _Tp> | |
465 | struct __is_pointer_helper<_Tp*> | |
466 | : public true_type { }; | |
53dc5044 PC |
467 | |
468 | /// is_pointer | |
469 | template<typename _Tp> | |
470 | struct is_pointer | |
391d5d2e | 471 | : public __is_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
472 | { }; |
473 | ||
123c516a PC |
474 | /// is_lvalue_reference |
475 | template<typename> | |
476 | struct is_lvalue_reference | |
477 | : public false_type { }; | |
478 | ||
53dc5044 | 479 | template<typename _Tp> |
123c516a PC |
480 | struct is_lvalue_reference<_Tp&> |
481 | : public true_type { }; | |
482 | ||
483 | /// is_rvalue_reference | |
484 | template<typename> | |
485 | struct is_rvalue_reference | |
486 | : public false_type { }; | |
53dc5044 | 487 | |
53dc5044 | 488 | template<typename _Tp> |
123c516a PC |
489 | struct is_rvalue_reference<_Tp&&> |
490 | : public true_type { }; | |
491 | ||
53dc5044 PC |
492 | template<typename> |
493 | struct __is_member_object_pointer_helper | |
494 | : public false_type { }; | |
123c516a PC |
495 | |
496 | template<typename _Tp, typename _Cp> | |
497 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 498 | : public __not_<is_function<_Tp>>::type { }; |
53dc5044 PC |
499 | |
500 | /// is_member_object_pointer | |
501 | template<typename _Tp> | |
502 | struct is_member_object_pointer | |
391d5d2e | 503 | : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
504 | { }; |
505 | ||
506 | template<typename> | |
507 | struct __is_member_function_pointer_helper | |
508 | : public false_type { }; | |
123c516a PC |
509 | |
510 | template<typename _Tp, typename _Cp> | |
511 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 512 | : public is_function<_Tp>::type { }; |
53dc5044 PC |
513 | |
514 | /// is_member_function_pointer | |
515 | template<typename _Tp> | |
516 | struct is_member_function_pointer | |
391d5d2e | 517 | : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
518 | { }; |
519 | ||
520 | /// is_enum | |
521 | template<typename _Tp> | |
522 | struct is_enum | |
523 | : public integral_constant<bool, __is_enum(_Tp)> | |
524 | { }; | |
525 | ||
526 | /// is_union | |
527 | template<typename _Tp> | |
528 | struct is_union | |
529 | : public integral_constant<bool, __is_union(_Tp)> | |
530 | { }; | |
531 | ||
532 | /// is_class | |
533 | template<typename _Tp> | |
534 | struct is_class | |
535 | : public integral_constant<bool, __is_class(_Tp)> | |
536 | { }; | |
537 | ||
538 | /// is_function | |
72459cfd | 539 | template<typename _Tp> |
53dc5044 | 540 | struct is_function |
72459cfd | 541 | : public __bool_constant<!is_const<const _Tp>::value> { }; |
89898034 | 542 | |
72459cfd JW |
543 | template<typename _Tp> |
544 | struct is_function<_Tp&> | |
545 | : public false_type { }; | |
89898034 | 546 | |
72459cfd JW |
547 | template<typename _Tp> |
548 | struct is_function<_Tp&&> | |
549 | : public false_type { }; | |
89898034 | 550 | |
b8806796 | 551 | #define __cpp_lib_is_null_pointer 201309L |
a15f7cb8 | 552 | |
1e673415 | 553 | template<typename> |
aa940ab5 | 554 | struct __is_null_pointer_helper |
1e673415 | 555 | : public false_type { }; |
123c516a PC |
556 | |
557 | template<> | |
aa940ab5 | 558 | struct __is_null_pointer_helper<std::nullptr_t> |
123c516a | 559 | : public true_type { }; |
1e673415 | 560 | |
aa940ab5 PC |
561 | /// is_null_pointer (LWG 2247). |
562 | template<typename _Tp> | |
563 | struct is_null_pointer | |
391d5d2e | 564 | : public __is_null_pointer_helper<__remove_cv_t<_Tp>>::type |
aa940ab5 PC |
565 | { }; |
566 | ||
07fd852f | 567 | /// __is_nullptr_t (deprecated extension). |
aba938d6 | 568 | /// @deprecated Non-standard. Use `is_null_pointer` instead. |
1e673415 PC |
569 | template<typename _Tp> |
570 | struct __is_nullptr_t | |
aa940ab5 | 571 | : public is_null_pointer<_Tp> |
eef9bf4c | 572 | { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer"); |
1e673415 | 573 | |
c0ffa2ba | 574 | // Composite type categories. |
123c516a PC |
575 | |
576 | /// is_reference | |
577 | template<typename _Tp> | |
578 | struct is_reference | |
579 | : public __or_<is_lvalue_reference<_Tp>, | |
580 | is_rvalue_reference<_Tp>>::type | |
581 | { }; | |
582 | ||
53dc5044 PC |
583 | /// is_arithmetic |
584 | template<typename _Tp> | |
585 | struct is_arithmetic | |
123c516a | 586 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
587 | { }; |
588 | ||
589 | /// is_fundamental | |
590 | template<typename _Tp> | |
591 | struct is_fundamental | |
aa940ab5 PC |
592 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, |
593 | is_null_pointer<_Tp>>::type | |
53dc5044 PC |
594 | { }; |
595 | ||
596 | /// is_object | |
597 | template<typename _Tp> | |
598 | struct is_object | |
123c516a PC |
599 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
600 | is_void<_Tp>>>::type | |
53dc5044 PC |
601 | { }; |
602 | ||
123c516a | 603 | template<typename> |
53dc5044 PC |
604 | struct is_member_pointer; |
605 | ||
606 | /// is_scalar | |
607 | template<typename _Tp> | |
608 | struct is_scalar | |
123c516a | 609 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
aa940ab5 | 610 | is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type |
53dc5044 PC |
611 | { }; |
612 | ||
613 | /// is_compound | |
614 | template<typename _Tp> | |
615 | struct is_compound | |
c01f9216 | 616 | : public __not_<is_fundamental<_Tp>>::type { }; |
53dc5044 | 617 | |
6963c3b9 | 618 | /// @cond undocumented |
53dc5044 PC |
619 | template<typename _Tp> |
620 | struct __is_member_pointer_helper | |
621 | : public false_type { }; | |
123c516a PC |
622 | |
623 | template<typename _Tp, typename _Cp> | |
624 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
625 | : public true_type { }; | |
6963c3b9 | 626 | /// @endcond |
53dc5044 | 627 | |
13901e4b | 628 | /// is_member_pointer |
53dc5044 | 629 | template<typename _Tp> |
123c516a | 630 | struct is_member_pointer |
391d5d2e | 631 | : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
632 | { }; |
633 | ||
47f79054 JW |
634 | template<typename, typename> |
635 | struct is_same; | |
636 | ||
6963c3b9 | 637 | /// @cond undocumented |
47f79054 JW |
638 | template<typename _Tp, typename... _Types> |
639 | using __is_one_of = __or_<is_same<_Tp, _Types>...>; | |
640 | ||
641 | // Check if a type is one of the signed integer types. | |
42167831 | 642 | __extension__ |
47f79054 | 643 | template<typename _Tp> |
391d5d2e | 644 | using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
645 | signed char, signed short, signed int, signed long, |
646 | signed long long | |
647 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
648 | , signed __GLIBCXX_TYPE_INT_N_0 | |
649 | #endif | |
650 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
651 | , signed __GLIBCXX_TYPE_INT_N_1 | |
652 | #endif | |
653 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
654 | , signed __GLIBCXX_TYPE_INT_N_2 | |
655 | #endif | |
656 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
657 | , signed __GLIBCXX_TYPE_INT_N_3 | |
658 | #endif | |
659 | >; | |
660 | ||
661 | // Check if a type is one of the unsigned integer types. | |
42167831 | 662 | __extension__ |
47f79054 | 663 | template<typename _Tp> |
391d5d2e | 664 | using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
665 | unsigned char, unsigned short, unsigned int, unsigned long, |
666 | unsigned long long | |
667 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
668 | , unsigned __GLIBCXX_TYPE_INT_N_0 | |
669 | #endif | |
670 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
671 | , unsigned __GLIBCXX_TYPE_INT_N_1 | |
672 | #endif | |
673 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
674 | , unsigned __GLIBCXX_TYPE_INT_N_2 | |
675 | #endif | |
676 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
677 | , unsigned __GLIBCXX_TYPE_INT_N_3 | |
678 | #endif | |
679 | >; | |
680 | ||
98cf2c26 JW |
681 | // Check if a type is one of the signed or unsigned integer types. |
682 | template<typename _Tp> | |
683 | using __is_standard_integer | |
684 | = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>; | |
47f79054 | 685 | |
72459cfd JW |
686 | // __void_t (std::void_t for C++11) |
687 | template<typename...> using __void_t = void; | |
688 | ||
89898034 DK |
689 | // Utility to detect referenceable types ([defns.referenceable]). |
690 | ||
72459cfd | 691 | template<typename _Tp, typename = void> |
89898034 | 692 | struct __is_referenceable |
72459cfd | 693 | : public false_type |
89898034 DK |
694 | { }; |
695 | ||
72459cfd JW |
696 | template<typename _Tp> |
697 | struct __is_referenceable<_Tp, __void_t<_Tp&>> | |
89898034 DK |
698 | : public true_type |
699 | { }; | |
6963c3b9 | 700 | /// @endcond |
89898034 | 701 | |
c0ffa2ba | 702 | // Type properties. |
123c516a | 703 | |
53dc5044 PC |
704 | /// is_const |
705 | template<typename> | |
706 | struct is_const | |
707 | : public false_type { }; | |
708 | ||
709 | template<typename _Tp> | |
710 | struct is_const<_Tp const> | |
711 | : public true_type { }; | |
33ac58d5 | 712 | |
53dc5044 PC |
713 | /// is_volatile |
714 | template<typename> | |
715 | struct is_volatile | |
716 | : public false_type { }; | |
717 | ||
718 | template<typename _Tp> | |
719 | struct is_volatile<_Tp volatile> | |
720 | : public true_type { }; | |
721 | ||
123c516a PC |
722 | /// is_trivial |
723 | template<typename _Tp> | |
724 | struct is_trivial | |
725 | : public integral_constant<bool, __is_trivial(_Tp)> | |
608a080c AP |
726 | { |
727 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
728 | "template argument must be a complete class or an unbounded array"); | |
729 | }; | |
123c516a | 730 | |
6963c3b9 | 731 | /// is_trivially_copyable |
f5e523b7 VV |
732 | template<typename _Tp> |
733 | struct is_trivially_copyable | |
734 | : public integral_constant<bool, __is_trivially_copyable(_Tp)> | |
608a080c AP |
735 | { |
736 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
737 | "template argument must be a complete class or an unbounded array"); | |
738 | }; | |
123c516a PC |
739 | |
740 | /// is_standard_layout | |
741 | template<typename _Tp> | |
742 | struct is_standard_layout | |
743 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
608a080c AP |
744 | { |
745 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
746 | "template argument must be a complete class or an unbounded array"); | |
747 | }; | |
123c516a | 748 | |
aba938d6 JW |
749 | /** is_pod |
750 | * @deprecated Deprecated in C++20. | |
751 | * Use `is_standard_layout && is_trivial` instead. | |
6963c3b9 | 752 | */ |
123c516a PC |
753 | // Could use is_standard_layout && is_trivial instead of the builtin. |
754 | template<typename _Tp> | |
1a6c5064 JTM |
755 | struct |
756 | _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead") | |
757 | is_pod | |
123c516a | 758 | : public integral_constant<bool, __is_pod(_Tp)> |
608a080c AP |
759 | { |
760 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
761 | "template argument must be a complete class or an unbounded array"); | |
762 | }; | |
123c516a | 763 | |
6963c3b9 | 764 | /** is_literal_type |
aba938d6 JW |
765 | * @deprecated Deprecated in C++17, removed in C++20. |
766 | * The idea of a literal type isn't useful. | |
6963c3b9 | 767 | */ |
123c516a | 768 | template<typename _Tp> |
24b54628 VV |
769 | struct |
770 | _GLIBCXX17_DEPRECATED | |
771 | is_literal_type | |
123c516a | 772 | : public integral_constant<bool, __is_literal_type(_Tp)> |
608a080c AP |
773 | { |
774 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
775 | "template argument must be a complete class or an unbounded array"); | |
776 | }; | |
123c516a | 777 | |
53dc5044 PC |
778 | /// is_empty |
779 | template<typename _Tp> | |
780 | struct is_empty | |
781 | : public integral_constant<bool, __is_empty(_Tp)> | |
209ee624 | 782 | { }; |
53dc5044 PC |
783 | |
784 | /// is_polymorphic | |
785 | template<typename _Tp> | |
786 | struct is_polymorphic | |
787 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
209ee624 | 788 | { }; |
53dc5044 | 789 | |
4db7fcb9 ESR |
790 | #if __cplusplus >= 201402L |
791 | #define __cpp_lib_is_final 201402L | |
792 | /// is_final | |
6963c3b9 | 793 | /// @since C++14 |
4db7fcb9 ESR |
794 | template<typename _Tp> |
795 | struct is_final | |
796 | : public integral_constant<bool, __is_final(_Tp)> | |
209ee624 | 797 | { }; |
4db7fcb9 ESR |
798 | #endif |
799 | ||
53dc5044 PC |
800 | /// is_abstract |
801 | template<typename _Tp> | |
802 | struct is_abstract | |
803 | : public integral_constant<bool, __is_abstract(_Tp)> | |
209ee624 | 804 | { }; |
53dc5044 | 805 | |
6963c3b9 | 806 | /// @cond undocumented |
123c516a | 807 | template<typename _Tp, |
6a4b1a00 | 808 | bool = is_arithmetic<_Tp>::value> |
123c516a PC |
809 | struct __is_signed_helper |
810 | : public false_type { }; | |
811 | ||
53dc5044 | 812 | template<typename _Tp> |
6a4b1a00 PC |
813 | struct __is_signed_helper<_Tp, true> |
814 | : public integral_constant<bool, _Tp(-1) < _Tp(0)> | |
53dc5044 | 815 | { }; |
6963c3b9 | 816 | /// @endcond |
53dc5044 | 817 | |
123c516a | 818 | /// is_signed |
53dc5044 | 819 | template<typename _Tp> |
123c516a | 820 | struct is_signed |
82b12c4b | 821 | : public __is_signed_helper<_Tp>::type |
123c516a PC |
822 | { }; |
823 | ||
824 | /// is_unsigned | |
825 | template<typename _Tp> | |
826 | struct is_unsigned | |
f7632193 | 827 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>> |
123c516a PC |
828 | { }; |
829 | ||
6963c3b9 | 830 | /// @cond undocumented |
ec26ff5a JW |
831 | template<typename _Tp, typename _Up = _Tp&&> |
832 | _Up | |
833 | __declval(int); | |
834 | ||
835 | template<typename _Tp> | |
836 | _Tp | |
837 | __declval(long); | |
6963c3b9 | 838 | /// @endcond |
ec26ff5a | 839 | |
53dc5044 | 840 | template<typename _Tp> |
ec26ff5a | 841 | auto declval() noexcept -> decltype(__declval<_Tp>(0)); |
53dc5044 | 842 | |
123c516a PC |
843 | template<typename, unsigned = 0> |
844 | struct extent; | |
845 | ||
846 | template<typename> | |
847 | struct remove_all_extents; | |
848 | ||
6963c3b9 | 849 | /// @cond undocumented |
123c516a PC |
850 | template<typename _Tp> |
851 | struct __is_array_known_bounds | |
852 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
853 | { }; |
854 | ||
123c516a PC |
855 | template<typename _Tp> |
856 | struct __is_array_unknown_bounds | |
f7632193 | 857 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>> |
53dc5044 | 858 | { }; |
33ac58d5 | 859 | |
6963c3b9 JW |
860 | // Destructible and constructible type properties. |
861 | ||
62fa805f | 862 | // In N3290 is_destructible does not say anything about function |
2c7a09d7 | 863 | // types and abstract types, see LWG 2049. This implementation |
62fa805f DK |
864 | // describes function types as non-destructible and all complete |
865 | // object types as destructible, iff the explicit destructor | |
2c7a09d7 | 866 | // call expression is wellformed. |
62fa805f | 867 | struct __do_is_destructible_impl |
123c516a | 868 | { |
62fa805f | 869 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
123c516a PC |
870 | static true_type __test(int); |
871 | ||
872 | template<typename> | |
873 | static false_type __test(...); | |
874 | }; | |
53dc5044 PC |
875 | |
876 | template<typename _Tp> | |
62fa805f DK |
877 | struct __is_destructible_impl |
878 | : public __do_is_destructible_impl | |
123c516a PC |
879 | { |
880 | typedef decltype(__test<_Tp>(0)) type; | |
881 | }; | |
53dc5044 | 882 | |
62fa805f DK |
883 | template<typename _Tp, |
884 | bool = __or_<is_void<_Tp>, | |
885 | __is_array_unknown_bounds<_Tp>, | |
886 | is_function<_Tp>>::value, | |
887 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
888 | struct __is_destructible_safe; | |
889 | ||
890 | template<typename _Tp> | |
891 | struct __is_destructible_safe<_Tp, false, false> | |
892 | : public __is_destructible_impl<typename | |
893 | remove_all_extents<_Tp>::type>::type | |
894 | { }; | |
895 | ||
896 | template<typename _Tp> | |
897 | struct __is_destructible_safe<_Tp, true, false> | |
898 | : public false_type { }; | |
899 | ||
900 | template<typename _Tp> | |
901 | struct __is_destructible_safe<_Tp, false, true> | |
902 | : public true_type { }; | |
6963c3b9 | 903 | /// @endcond |
62fa805f DK |
904 | |
905 | /// is_destructible | |
906 | template<typename _Tp> | |
907 | struct is_destructible | |
82b12c4b | 908 | : public __is_destructible_safe<_Tp>::type |
608a080c AP |
909 | { |
910 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
911 | "template argument must be a complete class or an unbounded array"); | |
912 | }; | |
62fa805f | 913 | |
6963c3b9 JW |
914 | /// @cond undocumented |
915 | ||
62fa805f DK |
916 | // is_nothrow_destructible requires that is_destructible is |
917 | // satisfied as well. We realize that by mimicing the | |
918 | // implementation of is_destructible but refer to noexcept(expr) | |
919 | // instead of decltype(expr). | |
920 | struct __do_is_nt_destructible_impl | |
123c516a | 921 | { |
62fa805f | 922 | template<typename _Tp> |
c01f9216 JW |
923 | static __bool_constant<noexcept(declval<_Tp&>().~_Tp())> |
924 | __test(int); | |
123c516a PC |
925 | |
926 | template<typename> | |
927 | static false_type __test(...); | |
928 | }; | |
53dc5044 | 929 | |
53dc5044 | 930 | template<typename _Tp> |
62fa805f DK |
931 | struct __is_nt_destructible_impl |
932 | : public __do_is_nt_destructible_impl | |
123c516a PC |
933 | { |
934 | typedef decltype(__test<_Tp>(0)) type; | |
935 | }; | |
936 | ||
937 | template<typename _Tp, | |
938 | bool = __or_<is_void<_Tp>, | |
62fa805f DK |
939 | __is_array_unknown_bounds<_Tp>, |
940 | is_function<_Tp>>::value, | |
941 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
942 | struct __is_nt_destructible_safe; | |
53dc5044 PC |
943 | |
944 | template<typename _Tp> | |
62fa805f DK |
945 | struct __is_nt_destructible_safe<_Tp, false, false> |
946 | : public __is_nt_destructible_impl<typename | |
947 | remove_all_extents<_Tp>::type>::type | |
123c516a PC |
948 | { }; |
949 | ||
53dc5044 | 950 | template<typename _Tp> |
62fa805f | 951 | struct __is_nt_destructible_safe<_Tp, true, false> |
123c516a | 952 | : public false_type { }; |
53dc5044 PC |
953 | |
954 | template<typename _Tp> | |
62fa805f | 955 | struct __is_nt_destructible_safe<_Tp, false, true> |
123c516a | 956 | : public true_type { }; |
6963c3b9 | 957 | /// @endcond |
123c516a | 958 | |
62fa805f | 959 | /// is_nothrow_destructible |
53dc5044 | 960 | template<typename _Tp> |
62fa805f | 961 | struct is_nothrow_destructible |
82b12c4b | 962 | : public __is_nt_destructible_safe<_Tp>::type |
608a080c AP |
963 | { |
964 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
965 | "template argument must be a complete class or an unbounded array"); | |
966 | }; | |
967 | ||
6963c3b9 | 968 | /// @cond undocumented |
608a080c AP |
969 | template<typename _Tp, typename... _Args> |
970 | struct __is_constructible_impl | |
971 | : public __bool_constant<__is_constructible(_Tp, _Args...)> | |
123c516a | 972 | { }; |
6963c3b9 | 973 | /// @endcond |
123c516a | 974 | |
58487c21 JW |
975 | /// is_constructible |
976 | template<typename _Tp, typename... _Args> | |
977 | struct is_constructible | |
608a080c AP |
978 | : public __is_constructible_impl<_Tp, _Args...> |
979 | { | |
980 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
981 | "template argument must be a complete class or an unbounded array"); | |
982 | }; | |
4a27a739 | 983 | |
123c516a | 984 | /// is_default_constructible |
4a27a739 | 985 | template<typename _Tp> |
123c516a | 986 | struct is_default_constructible |
608a080c AP |
987 | : public __is_constructible_impl<_Tp>::type |
988 | { | |
989 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
990 | "template argument must be a complete class or an unbounded array"); | |
991 | }; | |
c32097d8 | 992 | |
6963c3b9 | 993 | /// @cond undocumented |
89898034 | 994 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd | 995 | struct __is_copy_constructible_impl; |
123c516a | 996 | |
65cee9bd | 997 | template<typename _Tp> |
89898034 | 998 | struct __is_copy_constructible_impl<_Tp, false> |
65cee9bd PC |
999 | : public false_type { }; |
1000 | ||
1001 | template<typename _Tp> | |
89898034 | 1002 | struct __is_copy_constructible_impl<_Tp, true> |
608a080c | 1003 | : public __is_constructible_impl<_Tp, const _Tp&> |
65cee9bd | 1004 | { }; |
6963c3b9 | 1005 | /// @endcond |
65cee9bd PC |
1006 | |
1007 | /// is_copy_constructible | |
1008 | template<typename _Tp> | |
1009 | struct is_copy_constructible | |
1010 | : public __is_copy_constructible_impl<_Tp> | |
608a080c AP |
1011 | { |
1012 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1013 | "template argument must be a complete class or an unbounded array"); | |
1014 | }; | |
65cee9bd | 1015 | |
6963c3b9 | 1016 | /// @cond undocumented |
89898034 | 1017 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1018 | struct __is_move_constructible_impl; |
1019 | ||
1020 | template<typename _Tp> | |
89898034 | 1021 | struct __is_move_constructible_impl<_Tp, false> |
65cee9bd PC |
1022 | : public false_type { }; |
1023 | ||
1024 | template<typename _Tp> | |
89898034 | 1025 | struct __is_move_constructible_impl<_Tp, true> |
608a080c | 1026 | : public __is_constructible_impl<_Tp, _Tp&&> |
65cee9bd | 1027 | { }; |
6963c3b9 | 1028 | /// @endcond |
65cee9bd PC |
1029 | |
1030 | /// is_move_constructible | |
1031 | template<typename _Tp> | |
1032 | struct is_move_constructible | |
1033 | : public __is_move_constructible_impl<_Tp> | |
608a080c AP |
1034 | { |
1035 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1036 | "template argument must be a complete class or an unbounded array"); | |
1037 | }; | |
65cee9bd | 1038 | |
6963c3b9 | 1039 | /// @cond undocumented |
b3341826 JW |
1040 | template<typename _Tp, typename... _Args> |
1041 | using __is_nothrow_constructible_impl | |
9e2256dc | 1042 | = __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>; |
6963c3b9 | 1043 | /// @endcond |
b3341826 | 1044 | |
608a080c AP |
1045 | /// is_nothrow_constructible |
1046 | template<typename _Tp, typename... _Args> | |
1047 | struct is_nothrow_constructible | |
1048 | : public __is_nothrow_constructible_impl<_Tp, _Args...>::type | |
1049 | { | |
1050 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1051 | "template argument must be a complete class or an unbounded array"); | |
1052 | }; | |
1053 | ||
b3341826 JW |
1054 | /// is_nothrow_default_constructible |
1055 | template<typename _Tp> | |
1056 | struct is_nothrow_default_constructible | |
9e2256dc | 1057 | : public __bool_constant<__is_nothrow_constructible(_Tp)> |
b3341826 JW |
1058 | { |
1059 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1060 | "template argument must be a complete class or an unbounded array"); | |
1061 | }; | |
1062 | ||
6963c3b9 | 1063 | /// @cond undocumented |
89898034 | 1064 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1065 | struct __is_nothrow_copy_constructible_impl; |
1066 | ||
1067 | template<typename _Tp> | |
89898034 | 1068 | struct __is_nothrow_copy_constructible_impl<_Tp, false> |
65cee9bd PC |
1069 | : public false_type { }; |
1070 | ||
1071 | template<typename _Tp> | |
89898034 | 1072 | struct __is_nothrow_copy_constructible_impl<_Tp, true> |
608a080c | 1073 | : public __is_nothrow_constructible_impl<_Tp, const _Tp&> |
65cee9bd | 1074 | { }; |
6963c3b9 | 1075 | /// @endcond |
65cee9bd PC |
1076 | |
1077 | /// is_nothrow_copy_constructible | |
1078 | template<typename _Tp> | |
1079 | struct is_nothrow_copy_constructible | |
608a080c AP |
1080 | : public __is_nothrow_copy_constructible_impl<_Tp>::type |
1081 | { | |
1082 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1083 | "template argument must be a complete class or an unbounded array"); | |
1084 | }; | |
65cee9bd | 1085 | |
6963c3b9 | 1086 | /// @cond undocumented |
89898034 | 1087 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1088 | struct __is_nothrow_move_constructible_impl; |
1089 | ||
1090 | template<typename _Tp> | |
89898034 | 1091 | struct __is_nothrow_move_constructible_impl<_Tp, false> |
65cee9bd PC |
1092 | : public false_type { }; |
1093 | ||
1094 | template<typename _Tp> | |
89898034 | 1095 | struct __is_nothrow_move_constructible_impl<_Tp, true> |
608a080c | 1096 | : public __is_nothrow_constructible_impl<_Tp, _Tp&&> |
65cee9bd | 1097 | { }; |
6963c3b9 | 1098 | /// @endcond |
65cee9bd PC |
1099 | |
1100 | /// is_nothrow_move_constructible | |
1101 | template<typename _Tp> | |
1102 | struct is_nothrow_move_constructible | |
608a080c AP |
1103 | : public __is_nothrow_move_constructible_impl<_Tp>::type |
1104 | { | |
1105 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1106 | "template argument must be a complete class or an unbounded array"); | |
1107 | }; | |
65cee9bd | 1108 | |
f263981a PC |
1109 | /// is_assignable |
1110 | template<typename _Tp, typename _Up> | |
1111 | struct is_assignable | |
608a080c AP |
1112 | : public __bool_constant<__is_assignable(_Tp, _Up)> |
1113 | { | |
1114 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1115 | "template argument must be a complete class or an unbounded array"); | |
1116 | }; | |
f263981a | 1117 | |
89898034 | 1118 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1119 | struct __is_copy_assignable_impl; |
1120 | ||
1121 | template<typename _Tp> | |
89898034 | 1122 | struct __is_copy_assignable_impl<_Tp, false> |
f263981a PC |
1123 | : public false_type { }; |
1124 | ||
1125 | template<typename _Tp> | |
89898034 | 1126 | struct __is_copy_assignable_impl<_Tp, true> |
608a080c | 1127 | : public __bool_constant<__is_assignable(_Tp&, const _Tp&)> |
f263981a PC |
1128 | { }; |
1129 | ||
1130 | /// is_copy_assignable | |
1131 | template<typename _Tp> | |
1132 | struct is_copy_assignable | |
608a080c AP |
1133 | : public __is_copy_assignable_impl<_Tp>::type |
1134 | { | |
1135 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1136 | "template argument must be a complete class or an unbounded array"); | |
1137 | }; | |
f263981a | 1138 | |
89898034 | 1139 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1140 | struct __is_move_assignable_impl; |
1141 | ||
1142 | template<typename _Tp> | |
89898034 | 1143 | struct __is_move_assignable_impl<_Tp, false> |
f263981a PC |
1144 | : public false_type { }; |
1145 | ||
1146 | template<typename _Tp> | |
89898034 | 1147 | struct __is_move_assignable_impl<_Tp, true> |
608a080c | 1148 | : public __bool_constant<__is_assignable(_Tp&, _Tp&&)> |
f263981a PC |
1149 | { }; |
1150 | ||
1151 | /// is_move_assignable | |
1152 | template<typename _Tp> | |
1153 | struct is_move_assignable | |
608a080c AP |
1154 | : public __is_move_assignable_impl<_Tp>::type |
1155 | { | |
1156 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1157 | "template argument must be a complete class or an unbounded array"); | |
1158 | }; | |
f263981a PC |
1159 | |
1160 | template<typename _Tp, typename _Up> | |
9e2256dc VV |
1161 | using __is_nothrow_assignable_impl |
1162 | = __bool_constant<__is_nothrow_assignable(_Tp, _Up)>; | |
f263981a | 1163 | |
608a080c AP |
1164 | /// is_nothrow_assignable |
1165 | template<typename _Tp, typename _Up> | |
1166 | struct is_nothrow_assignable | |
1167 | : public __is_nothrow_assignable_impl<_Tp, _Up> | |
1168 | { | |
1169 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1170 | "template argument must be a complete class or an unbounded array"); | |
1171 | }; | |
1172 | ||
89898034 | 1173 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1174 | struct __is_nt_copy_assignable_impl; |
1175 | ||
1176 | template<typename _Tp> | |
89898034 | 1177 | struct __is_nt_copy_assignable_impl<_Tp, false> |
f263981a PC |
1178 | : public false_type { }; |
1179 | ||
1180 | template<typename _Tp> | |
89898034 | 1181 | struct __is_nt_copy_assignable_impl<_Tp, true> |
608a080c | 1182 | : public __is_nothrow_assignable_impl<_Tp&, const _Tp&> |
f263981a PC |
1183 | { }; |
1184 | ||
1185 | /// is_nothrow_copy_assignable | |
1186 | template<typename _Tp> | |
1187 | struct is_nothrow_copy_assignable | |
1188 | : public __is_nt_copy_assignable_impl<_Tp> | |
608a080c AP |
1189 | { |
1190 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1191 | "template argument must be a complete class or an unbounded array"); | |
1192 | }; | |
f263981a | 1193 | |
89898034 | 1194 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1195 | struct __is_nt_move_assignable_impl; |
1196 | ||
1197 | template<typename _Tp> | |
89898034 | 1198 | struct __is_nt_move_assignable_impl<_Tp, false> |
f263981a PC |
1199 | : public false_type { }; |
1200 | ||
1201 | template<typename _Tp> | |
89898034 | 1202 | struct __is_nt_move_assignable_impl<_Tp, true> |
608a080c | 1203 | : public __is_nothrow_assignable_impl<_Tp&, _Tp&&> |
f263981a PC |
1204 | { }; |
1205 | ||
1206 | /// is_nothrow_move_assignable | |
65cee9bd | 1207 | template<typename _Tp> |
f263981a PC |
1208 | struct is_nothrow_move_assignable |
1209 | : public __is_nt_move_assignable_impl<_Tp> | |
608a080c AP |
1210 | { |
1211 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1212 | "template argument must be a complete class or an unbounded array"); | |
1213 | }; | |
e4f32cb0 | 1214 | |
f5e523b7 VV |
1215 | /// is_trivially_constructible |
1216 | template<typename _Tp, typename... _Args> | |
1217 | struct is_trivially_constructible | |
c01f9216 | 1218 | : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)> |
608a080c AP |
1219 | { |
1220 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1221 | "template argument must be a complete class or an unbounded array"); | |
1222 | }; | |
33ac58d5 | 1223 | |
f5e523b7 VV |
1224 | /// is_trivially_default_constructible |
1225 | template<typename _Tp> | |
1226 | struct is_trivially_default_constructible | |
608a080c AP |
1227 | : public __bool_constant<__is_trivially_constructible(_Tp)> |
1228 | { | |
1229 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1230 | "template argument must be a complete class or an unbounded array"); | |
1231 | }; | |
6a9ecd34 | 1232 | |
f7632193 VV |
1233 | struct __do_is_implicitly_default_constructible_impl |
1234 | { | |
1235 | template <typename _Tp> | |
1236 | static void __helper(const _Tp&); | |
1237 | ||
1238 | template <typename _Tp> | |
1239 | static true_type __test(const _Tp&, | |
1240 | decltype(__helper<const _Tp&>({}))* = 0); | |
1241 | ||
1242 | static false_type __test(...); | |
1243 | }; | |
1244 | ||
1245 | template<typename _Tp> | |
1246 | struct __is_implicitly_default_constructible_impl | |
e9029d55 JW |
1247 | : public __do_is_implicitly_default_constructible_impl |
1248 | { | |
1249 | typedef decltype(__test(declval<_Tp>())) type; | |
1250 | }; | |
f7632193 VV |
1251 | |
1252 | template<typename _Tp> | |
1253 | struct __is_implicitly_default_constructible_safe | |
e9029d55 JW |
1254 | : public __is_implicitly_default_constructible_impl<_Tp>::type |
1255 | { }; | |
f7632193 VV |
1256 | |
1257 | template <typename _Tp> | |
1258 | struct __is_implicitly_default_constructible | |
608a080c | 1259 | : public __and_<__is_constructible_impl<_Tp>, |
e9029d55 JW |
1260 | __is_implicitly_default_constructible_safe<_Tp>> |
1261 | { }; | |
f7632193 | 1262 | |
b42cc3ca VV |
1263 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
1264 | struct __is_trivially_copy_constructible_impl; | |
1265 | ||
f5e523b7 | 1266 | template<typename _Tp> |
b42cc3ca VV |
1267 | struct __is_trivially_copy_constructible_impl<_Tp, false> |
1268 | : public false_type { }; | |
1269 | ||
1270 | template<typename _Tp> | |
1271 | struct __is_trivially_copy_constructible_impl<_Tp, true> | |
608a080c | 1272 | : public __and_<__is_copy_constructible_impl<_Tp>, |
f5e523b7 | 1273 | integral_constant<bool, |
f7632193 | 1274 | __is_trivially_constructible(_Tp, const _Tp&)>> |
f5e523b7 | 1275 | { }; |
33ac58d5 | 1276 | |
608a080c | 1277 | /// is_trivially_copy_constructible |
b42cc3ca VV |
1278 | template<typename _Tp> |
1279 | struct is_trivially_copy_constructible | |
1280 | : public __is_trivially_copy_constructible_impl<_Tp> | |
608a080c AP |
1281 | { |
1282 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1283 | "template argument must be a complete class or an unbounded array"); | |
1284 | }; | |
b42cc3ca VV |
1285 | |
1286 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> | |
1287 | struct __is_trivially_move_constructible_impl; | |
1288 | ||
f5e523b7 | 1289 | template<typename _Tp> |
b42cc3ca VV |
1290 | struct __is_trivially_move_constructible_impl<_Tp, false> |
1291 | : public false_type { }; | |
1292 | ||
1293 | template<typename _Tp> | |
1294 | struct __is_trivially_move_constructible_impl<_Tp, true> | |
608a080c | 1295 | : public __and_<__is_move_constructible_impl<_Tp>, |
f5e523b7 | 1296 | integral_constant<bool, |
f7632193 | 1297 | __is_trivially_constructible(_Tp, _Tp&&)>> |
f5e523b7 | 1298 | { }; |
6a9ecd34 | 1299 | |
608a080c | 1300 | /// is_trivially_move_constructible |
b42cc3ca VV |
1301 | template<typename _Tp> |
1302 | struct is_trivially_move_constructible | |
1303 | : public __is_trivially_move_constructible_impl<_Tp> | |
608a080c AP |
1304 | { |
1305 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1306 | "template argument must be a complete class or an unbounded array"); | |
1307 | }; | |
b42cc3ca | 1308 | |
f5e523b7 VV |
1309 | /// is_trivially_assignable |
1310 | template<typename _Tp, typename _Up> | |
1311 | struct is_trivially_assignable | |
b42cc3ca | 1312 | : public __bool_constant<__is_trivially_assignable(_Tp, _Up)> |
608a080c AP |
1313 | { |
1314 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1315 | "template argument must be a complete class or an unbounded array"); | |
1316 | }; | |
b42cc3ca VV |
1317 | |
1318 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> | |
1319 | struct __is_trivially_copy_assignable_impl; | |
1320 | ||
f5e523b7 | 1321 | template<typename _Tp> |
b42cc3ca VV |
1322 | struct __is_trivially_copy_assignable_impl<_Tp, false> |
1323 | : public false_type { }; | |
1324 | ||
1325 | template<typename _Tp> | |
1326 | struct __is_trivially_copy_assignable_impl<_Tp, true> | |
c01f9216 | 1327 | : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)> |
f5e523b7 | 1328 | { }; |
6a9ecd34 | 1329 | |
608a080c | 1330 | /// is_trivially_copy_assignable |
b42cc3ca VV |
1331 | template<typename _Tp> |
1332 | struct is_trivially_copy_assignable | |
1333 | : public __is_trivially_copy_assignable_impl<_Tp> | |
608a080c AP |
1334 | { |
1335 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1336 | "template argument must be a complete class or an unbounded array"); | |
1337 | }; | |
b42cc3ca VV |
1338 | |
1339 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> | |
1340 | struct __is_trivially_move_assignable_impl; | |
1341 | ||
f5e523b7 | 1342 | template<typename _Tp> |
b42cc3ca VV |
1343 | struct __is_trivially_move_assignable_impl<_Tp, false> |
1344 | : public false_type { }; | |
1345 | ||
1346 | template<typename _Tp> | |
1347 | struct __is_trivially_move_assignable_impl<_Tp, true> | |
c01f9216 | 1348 | : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)> |
f5e523b7 | 1349 | { }; |
6a9ecd34 | 1350 | |
608a080c | 1351 | /// is_trivially_move_assignable |
b42cc3ca VV |
1352 | template<typename _Tp> |
1353 | struct is_trivially_move_assignable | |
1354 | : public __is_trivially_move_assignable_impl<_Tp> | |
608a080c AP |
1355 | { |
1356 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1357 | "template argument must be a complete class or an unbounded array"); | |
1358 | }; | |
b42cc3ca | 1359 | |
6a9ecd34 PC |
1360 | /// is_trivially_destructible |
1361 | template<typename _Tp> | |
1362 | struct is_trivially_destructible | |
608a080c | 1363 | : public __and_<__is_destructible_safe<_Tp>, |
c01f9216 | 1364 | __bool_constant<__has_trivial_destructor(_Tp)>> |
608a080c AP |
1365 | { |
1366 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1367 | "template argument must be a complete class or an unbounded array"); | |
1368 | }; | |
6a9ecd34 | 1369 | |
e133ace8 | 1370 | |
123c516a PC |
1371 | /// has_virtual_destructor |
1372 | template<typename _Tp> | |
1373 | struct has_virtual_destructor | |
1374 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
608a080c AP |
1375 | { |
1376 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1377 | "template argument must be a complete class or an unbounded array"); | |
1378 | }; | |
123c516a | 1379 | |
33ac58d5 | 1380 | |
123c516a PC |
1381 | // type property queries. |
1382 | ||
1383 | /// alignment_of | |
1384 | template<typename _Tp> | |
1385 | struct alignment_of | |
608a080c AP |
1386 | : public integral_constant<std::size_t, alignof(_Tp)> |
1387 | { | |
1388 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1389 | "template argument must be a complete class or an unbounded array"); | |
1390 | }; | |
33ac58d5 | 1391 | |
123c516a PC |
1392 | /// rank |
1393 | template<typename> | |
1394 | struct rank | |
1395 | : public integral_constant<std::size_t, 0> { }; | |
33ac58d5 | 1396 | |
123c516a PC |
1397 | template<typename _Tp, std::size_t _Size> |
1398 | struct rank<_Tp[_Size]> | |
1399 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1400 | ||
1401 | template<typename _Tp> | |
1402 | struct rank<_Tp[]> | |
1403 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1404 | ||
1405 | /// extent | |
1406 | template<typename, unsigned _Uint> | |
1407 | struct extent | |
1408 | : public integral_constant<std::size_t, 0> { }; | |
33ac58d5 | 1409 | |
123c516a PC |
1410 | template<typename _Tp, unsigned _Uint, std::size_t _Size> |
1411 | struct extent<_Tp[_Size], _Uint> | |
1412 | : public integral_constant<std::size_t, | |
1413 | _Uint == 0 ? _Size : extent<_Tp, | |
1414 | _Uint - 1>::value> | |
1415 | { }; | |
1416 | ||
1417 | template<typename _Tp, unsigned _Uint> | |
1418 | struct extent<_Tp[], _Uint> | |
1419 | : public integral_constant<std::size_t, | |
1420 | _Uint == 0 ? 0 : extent<_Tp, | |
1421 | _Uint - 1>::value> | |
1422 | { }; | |
1423 | ||
1424 | ||
c0ffa2ba | 1425 | // Type relations. |
123c516a PC |
1426 | |
1427 | /// is_same | |
02f6fdff | 1428 | template<typename _Tp, typename _Up> |
123c516a | 1429 | struct is_same |
73ae6eb5 JW |
1430 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
1431 | : public integral_constant<bool, __is_same(_Tp, _Up)> | |
44af818f JW |
1432 | #else |
1433 | : public false_type | |
1434 | #endif | |
02f6fdff | 1435 | { }; |
b0302c68 | 1436 | |
73ae6eb5 | 1437 | #ifndef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
44af818f JW |
1438 | template<typename _Tp> |
1439 | struct is_same<_Tp, _Tp> | |
1440 | : public true_type | |
1441 | { }; | |
1442 | #endif | |
1443 | ||
939759fc | 1444 | /// is_base_of |
e133ace8 PC |
1445 | template<typename _Base, typename _Derived> |
1446 | struct is_base_of | |
1447 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1448 | { }; | |
1449 | ||
297f34d7 | 1450 | template<typename _From, typename _To, |
123c516a PC |
1451 | bool = __or_<is_void<_From>, is_function<_To>, |
1452 | is_array<_To>>::value> | |
297f34d7 | 1453 | struct __is_convertible_helper |
8df27fcb JW |
1454 | { |
1455 | typedef typename is_void<_To>::type type; | |
8df27fcb | 1456 | }; |
297f34d7 | 1457 | |
cc28d234 JW |
1458 | #pragma GCC diagnostic push |
1459 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
e133ace8 | 1460 | template<typename _From, typename _To> |
b0302c68 | 1461 | class __is_convertible_helper<_From, _To, false> |
e133ace8 | 1462 | { |
8df27fcb JW |
1463 | template<typename _To1> |
1464 | static void __test_aux(_To1) noexcept; | |
8e7d962a | 1465 | |
82b12c4b FD |
1466 | template<typename _From1, typename _To1, |
1467 | typename = decltype(__test_aux<_To1>(std::declval<_From1>()))> | |
1468 | static true_type | |
8e7d962a PC |
1469 | __test(int); |
1470 | ||
1471 | template<typename, typename> | |
82b12c4b FD |
1472 | static false_type |
1473 | __test(...); | |
297f34d7 | 1474 | |
e133ace8 | 1475 | public: |
82b12c4b | 1476 | typedef decltype(__test<_From, _To>(0)) type; |
e133ace8 | 1477 | }; |
cc28d234 | 1478 | #pragma GCC diagnostic pop |
82b12c4b | 1479 | |
b0302c68 | 1480 | /// is_convertible |
e133ace8 PC |
1481 | template<typename _From, typename _To> |
1482 | struct is_convertible | |
82b12c4b | 1483 | : public __is_convertible_helper<_From, _To>::type |
e133ace8 PC |
1484 | { }; |
1485 | ||
0302a2de JW |
1486 | // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N> |
1487 | template<typename _ToElementType, typename _FromElementType> | |
1488 | using __is_array_convertible | |
1489 | = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>; | |
1490 | ||
608a080c | 1491 | template<typename _From, typename _To, |
ed99e818 JW |
1492 | bool = __or_<is_void<_From>, is_function<_To>, |
1493 | is_array<_To>>::value> | |
1494 | struct __is_nt_convertible_helper | |
1495 | : is_void<_To> | |
1496 | { }; | |
1497 | ||
cc28d234 JW |
1498 | #pragma GCC diagnostic push |
1499 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
ed99e818 JW |
1500 | template<typename _From, typename _To> |
1501 | class __is_nt_convertible_helper<_From, _To, false> | |
1502 | { | |
1503 | template<typename _To1> | |
1504 | static void __test_aux(_To1) noexcept; | |
1505 | ||
1506 | template<typename _From1, typename _To1> | |
ce9f305e JW |
1507 | static |
1508 | __bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))> | |
ed99e818 JW |
1509 | __test(int); |
1510 | ||
1511 | template<typename, typename> | |
1512 | static false_type | |
1513 | __test(...); | |
1514 | ||
1515 | public: | |
1516 | using type = decltype(__test<_From, _To>(0)); | |
1517 | }; | |
cc28d234 | 1518 | #pragma GCC diagnostic pop |
ed99e818 | 1519 | |
ce9f305e JW |
1520 | // is_nothrow_convertible for C++11 |
1521 | template<typename _From, typename _To> | |
1522 | struct __is_nothrow_convertible | |
1523 | : public __is_nt_convertible_helper<_From, _To>::type | |
1524 | { }; | |
1525 | ||
1526 | #if __cplusplus > 201703L | |
56772f62 | 1527 | #define __cpp_lib_is_nothrow_convertible 201806L |
8df27fcb JW |
1528 | /// is_nothrow_convertible |
1529 | template<typename _From, typename _To> | |
1530 | struct is_nothrow_convertible | |
ed99e818 | 1531 | : public __is_nt_convertible_helper<_From, _To>::type |
8df27fcb JW |
1532 | { }; |
1533 | ||
1534 | /// is_nothrow_convertible_v | |
1535 | template<typename _From, typename _To> | |
1536 | inline constexpr bool is_nothrow_convertible_v | |
1537 | = is_nothrow_convertible<_From, _To>::value; | |
1538 | #endif // C++2a | |
fd735b6a | 1539 | |
c0ffa2ba | 1540 | // Const-volatile modifications. |
7b50cdef | 1541 | |
123c516a | 1542 | /// remove_const |
7b50cdef | 1543 | template<typename _Tp> |
123c516a PC |
1544 | struct remove_const |
1545 | { typedef _Tp type; }; | |
7b50cdef | 1546 | |
123c516a PC |
1547 | template<typename _Tp> |
1548 | struct remove_const<_Tp const> | |
1549 | { typedef _Tp type; }; | |
33ac58d5 | 1550 | |
123c516a PC |
1551 | /// remove_volatile |
1552 | template<typename _Tp> | |
1553 | struct remove_volatile | |
1554 | { typedef _Tp type; }; | |
7b50cdef | 1555 | |
123c516a PC |
1556 | template<typename _Tp> |
1557 | struct remove_volatile<_Tp volatile> | |
1558 | { typedef _Tp type; }; | |
33ac58d5 | 1559 | |
123c516a PC |
1560 | /// remove_cv |
1561 | template<typename _Tp> | |
1562 | struct remove_cv | |
391d5d2e JW |
1563 | { using type = _Tp; }; |
1564 | ||
1565 | template<typename _Tp> | |
1566 | struct remove_cv<const _Tp> | |
1567 | { using type = _Tp; }; | |
1568 | ||
1569 | template<typename _Tp> | |
1570 | struct remove_cv<volatile _Tp> | |
1571 | { using type = _Tp; }; | |
1572 | ||
1573 | template<typename _Tp> | |
1574 | struct remove_cv<const volatile _Tp> | |
1575 | { using type = _Tp; }; | |
33ac58d5 | 1576 | |
123c516a PC |
1577 | /// add_const |
1578 | template<typename _Tp> | |
1579 | struct add_const | |
8be17e2a | 1580 | { using type = _Tp const; }; |
33ac58d5 | 1581 | |
123c516a PC |
1582 | /// add_volatile |
1583 | template<typename _Tp> | |
1584 | struct add_volatile | |
8be17e2a | 1585 | { using type = _Tp volatile; }; |
33ac58d5 | 1586 | |
123c516a PC |
1587 | /// add_cv |
1588 | template<typename _Tp> | |
1589 | struct add_cv | |
8be17e2a | 1590 | { using type = _Tp const volatile; }; |
7b50cdef | 1591 | |
4457e88c | 1592 | #if __cplusplus > 201103L |
a15f7cb8 | 1593 | |
b8806796 | 1594 | #define __cpp_lib_transformation_trait_aliases 201304L |
a15f7cb8 | 1595 | |
4457e88c JW |
1596 | /// Alias template for remove_const |
1597 | template<typename _Tp> | |
1598 | using remove_const_t = typename remove_const<_Tp>::type; | |
1599 | ||
1600 | /// Alias template for remove_volatile | |
1601 | template<typename _Tp> | |
1602 | using remove_volatile_t = typename remove_volatile<_Tp>::type; | |
1603 | ||
1604 | /// Alias template for remove_cv | |
1605 | template<typename _Tp> | |
1606 | using remove_cv_t = typename remove_cv<_Tp>::type; | |
1607 | ||
1608 | /// Alias template for add_const | |
1609 | template<typename _Tp> | |
1610 | using add_const_t = typename add_const<_Tp>::type; | |
1611 | ||
1612 | /// Alias template for add_volatile | |
1613 | template<typename _Tp> | |
1614 | using add_volatile_t = typename add_volatile<_Tp>::type; | |
1615 | ||
1616 | /// Alias template for add_cv | |
1617 | template<typename _Tp> | |
1618 | using add_cv_t = typename add_cv<_Tp>::type; | |
1619 | #endif | |
7b50cdef | 1620 | |
123c516a | 1621 | // Reference transformations. |
7b50cdef | 1622 | |
123c516a PC |
1623 | /// remove_reference |
1624 | template<typename _Tp> | |
1625 | struct remove_reference | |
1626 | { typedef _Tp type; }; | |
7b50cdef | 1627 | |
123c516a PC |
1628 | template<typename _Tp> |
1629 | struct remove_reference<_Tp&> | |
1630 | { typedef _Tp type; }; | |
7b50cdef | 1631 | |
123c516a PC |
1632 | template<typename _Tp> |
1633 | struct remove_reference<_Tp&&> | |
1634 | { typedef _Tp type; }; | |
1635 | ||
89898034 | 1636 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
123c516a PC |
1637 | struct __add_lvalue_reference_helper |
1638 | { typedef _Tp type; }; | |
7b50cdef | 1639 | |
5e108459 | 1640 | template<typename _Tp> |
89898034 | 1641 | struct __add_lvalue_reference_helper<_Tp, true> |
123c516a | 1642 | { typedef _Tp& type; }; |
5e108459 | 1643 | |
123c516a | 1644 | /// add_lvalue_reference |
5e108459 | 1645 | template<typename _Tp> |
123c516a PC |
1646 | struct add_lvalue_reference |
1647 | : public __add_lvalue_reference_helper<_Tp> | |
1648 | { }; | |
1649 | ||
89898034 | 1650 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
123c516a PC |
1651 | struct __add_rvalue_reference_helper |
1652 | { typedef _Tp type; }; | |
5e108459 PC |
1653 | |
1654 | template<typename _Tp> | |
123c516a PC |
1655 | struct __add_rvalue_reference_helper<_Tp, true> |
1656 | { typedef _Tp&& type; }; | |
5e108459 | 1657 | |
123c516a | 1658 | /// add_rvalue_reference |
5e108459 | 1659 | template<typename _Tp> |
123c516a PC |
1660 | struct add_rvalue_reference |
1661 | : public __add_rvalue_reference_helper<_Tp> | |
1662 | { }; | |
5e108459 | 1663 | |
4457e88c JW |
1664 | #if __cplusplus > 201103L |
1665 | /// Alias template for remove_reference | |
1666 | template<typename _Tp> | |
1667 | using remove_reference_t = typename remove_reference<_Tp>::type; | |
1668 | ||
1669 | /// Alias template for add_lvalue_reference | |
1670 | template<typename _Tp> | |
1671 | using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; | |
1672 | ||
1673 | /// Alias template for add_rvalue_reference | |
1674 | template<typename _Tp> | |
1675 | using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; | |
1676 | #endif | |
7b50cdef | 1677 | |
c0ffa2ba | 1678 | // Sign modifications. |
123c516a | 1679 | |
6963c3b9 JW |
1680 | /// @cond undocumented |
1681 | ||
7b50cdef BK |
1682 | // Utility for constructing identically cv-qualified types. |
1683 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1684 | struct __cv_selector; | |
1685 | ||
1686 | template<typename _Unqualified> | |
1687 | struct __cv_selector<_Unqualified, false, false> | |
1688 | { typedef _Unqualified __type; }; | |
1689 | ||
1690 | template<typename _Unqualified> | |
1691 | struct __cv_selector<_Unqualified, false, true> | |
1692 | { typedef volatile _Unqualified __type; }; | |
1693 | ||
1694 | template<typename _Unqualified> | |
1695 | struct __cv_selector<_Unqualified, true, false> | |
1696 | { typedef const _Unqualified __type; }; | |
1697 | ||
1698 | template<typename _Unqualified> | |
1699 | struct __cv_selector<_Unqualified, true, true> | |
1700 | { typedef const volatile _Unqualified __type; }; | |
1701 | ||
1702 | template<typename _Qualified, typename _Unqualified, | |
1703 | bool _IsConst = is_const<_Qualified>::value, | |
1704 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1705 | class __match_cv_qualifiers |
7b50cdef | 1706 | { |
7b50cdef BK |
1707 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1708 | ||
1709 | public: | |
33ac58d5 | 1710 | typedef typename __match::__type __type; |
7b50cdef BK |
1711 | }; |
1712 | ||
7b50cdef BK |
1713 | // Utility for finding the unsigned versions of signed integral types. |
1714 | template<typename _Tp> | |
e133ace8 PC |
1715 | struct __make_unsigned |
1716 | { typedef _Tp __type; }; | |
7b50cdef BK |
1717 | |
1718 | template<> | |
1719 | struct __make_unsigned<char> | |
1720 | { typedef unsigned char __type; }; | |
1721 | ||
1722 | template<> | |
1723 | struct __make_unsigned<signed char> | |
1724 | { typedef unsigned char __type; }; | |
1725 | ||
7b50cdef BK |
1726 | template<> |
1727 | struct __make_unsigned<short> | |
1728 | { typedef unsigned short __type; }; | |
1729 | ||
1730 | template<> | |
1731 | struct __make_unsigned<int> | |
1732 | { typedef unsigned int __type; }; | |
1733 | ||
1734 | template<> | |
1735 | struct __make_unsigned<long> | |
1736 | { typedef unsigned long __type; }; | |
1737 | ||
1738 | template<> | |
1739 | struct __make_unsigned<long long> | |
1740 | { typedef unsigned long long __type; }; | |
1741 | ||
78a7c317 | 1742 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1743 | __extension__ |
78a7c317 DD |
1744 | template<> |
1745 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0> | |
1746 | { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1747 | #endif | |
1748 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1749 | __extension__ |
78a7c317 DD |
1750 | template<> |
1751 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1> | |
1752 | { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1753 | #endif | |
1754 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1755 | __extension__ |
6d585f01 | 1756 | template<> |
78a7c317 DD |
1757 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2> |
1758 | { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1759 | #endif | |
1760 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1761 | __extension__ |
78a7c317 DD |
1762 | template<> |
1763 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3> | |
1764 | { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1765 | #endif |
1766 | ||
7b50cdef | 1767 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1768 | template<typename _Tp, |
7b50cdef | 1769 | bool _IsInt = is_integral<_Tp>::value, |
7b50cdef | 1770 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1771 | class __make_unsigned_selector; |
1772 | ||
7b50cdef | 1773 | template<typename _Tp> |
b0302c68 | 1774 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1775 | { |
22f1f4c7 | 1776 | using __unsigned_type |
391d5d2e | 1777 | = typename __make_unsigned<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1778 | |
1779 | public: | |
22f1f4c7 JW |
1780 | using __type |
1781 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
7b50cdef BK |
1782 | }; |
1783 | ||
22f1f4c7 JW |
1784 | class __make_unsigned_selector_base |
1785 | { | |
1786 | protected: | |
1787 | template<typename...> struct _List { }; | |
1788 | ||
1789 | template<typename _Tp, typename... _Up> | |
1790 | struct _List<_Tp, _Up...> : _List<_Up...> | |
1791 | { static constexpr size_t __size = sizeof(_Tp); }; | |
1792 | ||
1793 | template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)> | |
1794 | struct __select; | |
1795 | ||
1796 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1797 | struct __select<_Sz, _List<_Uint, _UInts...>, true> | |
1798 | { using __type = _Uint; }; | |
1799 | ||
1800 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1801 | struct __select<_Sz, _List<_Uint, _UInts...>, false> | |
1802 | : __select<_Sz, _List<_UInts...>> | |
1803 | { }; | |
1804 | }; | |
1805 | ||
1806 | // Choose unsigned integer type with the smallest rank and same size as _Tp | |
7b50cdef | 1807 | template<typename _Tp> |
b0302c68 | 1808 | class __make_unsigned_selector<_Tp, false, true> |
22f1f4c7 | 1809 | : __make_unsigned_selector_base |
7b50cdef | 1810 | { |
a0230468 | 1811 | // With -fshort-enums, an enum may be as small as a char. |
22f1f4c7 JW |
1812 | using _UInts = _List<unsigned char, unsigned short, unsigned int, |
1813 | unsigned long, unsigned long long>; | |
1814 | ||
1815 | using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type; | |
73d81d3a | 1816 | |
7b50cdef | 1817 | public: |
22f1f4c7 JW |
1818 | using __type |
1819 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
1820 | }; | |
1821 | ||
c124af93 TH |
1822 | // wchar_t, char8_t, char16_t and char32_t are integral types but are |
1823 | // neither signed integer types nor unsigned integer types, so must be | |
22f1f4c7 JW |
1824 | // transformed to the unsigned integer type with the smallest rank. |
1825 | // Use the partial specialization for enumeration types to do that. | |
22f1f4c7 JW |
1826 | template<> |
1827 | struct __make_unsigned<wchar_t> | |
1828 | { | |
1829 | using __type | |
1830 | = typename __make_unsigned_selector<wchar_t, false, true>::__type; | |
1831 | }; | |
22f1f4c7 | 1832 | |
c124af93 TH |
1833 | #ifdef _GLIBCXX_USE_CHAR8_T |
1834 | template<> | |
1835 | struct __make_unsigned<char8_t> | |
1836 | { | |
1837 | using __type | |
1838 | = typename __make_unsigned_selector<char8_t, false, true>::__type; | |
1839 | }; | |
1840 | #endif | |
1841 | ||
22f1f4c7 JW |
1842 | template<> |
1843 | struct __make_unsigned<char16_t> | |
1844 | { | |
1845 | using __type | |
1846 | = typename __make_unsigned_selector<char16_t, false, true>::__type; | |
1847 | }; | |
1848 | ||
1849 | template<> | |
1850 | struct __make_unsigned<char32_t> | |
1851 | { | |
1852 | using __type | |
1853 | = typename __make_unsigned_selector<char32_t, false, true>::__type; | |
7b50cdef | 1854 | }; |
6963c3b9 | 1855 | /// @endcond |
7b50cdef | 1856 | |
7b50cdef BK |
1857 | // Given an integral/enum type, return the corresponding unsigned |
1858 | // integer type. | |
5b9daa7e BK |
1859 | // Primary template. |
1860 | /// make_unsigned | |
7b50cdef | 1861 | template<typename _Tp> |
33ac58d5 | 1862 | struct make_unsigned |
7b50cdef BK |
1863 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; |
1864 | ||
1865 | // Integral, but don't define. | |
1866 | template<> | |
1867 | struct make_unsigned<bool>; | |
1868 | ||
6963c3b9 | 1869 | /// @cond undocumented |
7b50cdef BK |
1870 | |
1871 | // Utility for finding the signed versions of unsigned integral types. | |
1872 | template<typename _Tp> | |
e133ace8 PC |
1873 | struct __make_signed |
1874 | { typedef _Tp __type; }; | |
7b50cdef BK |
1875 | |
1876 | template<> | |
1877 | struct __make_signed<char> | |
1878 | { typedef signed char __type; }; | |
1879 | ||
1880 | template<> | |
1881 | struct __make_signed<unsigned char> | |
1882 | { typedef signed char __type; }; | |
1883 | ||
7b50cdef BK |
1884 | template<> |
1885 | struct __make_signed<unsigned short> | |
1886 | { typedef signed short __type; }; | |
1887 | ||
1888 | template<> | |
1889 | struct __make_signed<unsigned int> | |
1890 | { typedef signed int __type; }; | |
1891 | ||
1892 | template<> | |
1893 | struct __make_signed<unsigned long> | |
1894 | { typedef signed long __type; }; | |
1895 | ||
1896 | template<> | |
1897 | struct __make_signed<unsigned long long> | |
1898 | { typedef signed long long __type; }; | |
1899 | ||
78a7c317 | 1900 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1901 | __extension__ |
78a7c317 DD |
1902 | template<> |
1903 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0> | |
1904 | { typedef __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1905 | #endif | |
1906 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1907 | __extension__ |
78a7c317 DD |
1908 | template<> |
1909 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1> | |
1910 | { typedef __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1911 | #endif | |
1912 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1913 | __extension__ |
78a7c317 DD |
1914 | template<> |
1915 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2> | |
1916 | { typedef __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1917 | #endif | |
1918 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1919 | __extension__ |
6d585f01 | 1920 | template<> |
78a7c317 DD |
1921 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3> |
1922 | { typedef __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1923 | #endif |
1924 | ||
fb8ffd10 | 1925 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1926 | template<typename _Tp, |
7b50cdef | 1927 | bool _IsInt = is_integral<_Tp>::value, |
7b50cdef | 1928 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1929 | class __make_signed_selector; |
1930 | ||
7b50cdef | 1931 | template<typename _Tp> |
b0302c68 | 1932 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1933 | { |
22f1f4c7 | 1934 | using __signed_type |
391d5d2e | 1935 | = typename __make_signed<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1936 | |
1937 | public: | |
22f1f4c7 JW |
1938 | using __type |
1939 | = typename __match_cv_qualifiers<_Tp, __signed_type>::__type; | |
7b50cdef BK |
1940 | }; |
1941 | ||
22f1f4c7 | 1942 | // Choose signed integer type with the smallest rank and same size as _Tp |
7b50cdef | 1943 | template<typename _Tp> |
b0302c68 | 1944 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1945 | { |
73d81d3a | 1946 | typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type; |
7b50cdef BK |
1947 | |
1948 | public: | |
73d81d3a | 1949 | typedef typename __make_signed_selector<__unsigned_type>::__type __type; |
7b50cdef BK |
1950 | }; |
1951 | ||
22f1f4c7 | 1952 | // wchar_t, char16_t and char32_t are integral types but are neither |
d4b695e4 | 1953 | // signed integer types nor unsigned integer types, so must be |
22f1f4c7 JW |
1954 | // transformed to the signed integer type with the smallest rank. |
1955 | // Use the partial specialization for enumeration types to do that. | |
22f1f4c7 JW |
1956 | template<> |
1957 | struct __make_signed<wchar_t> | |
1958 | { | |
1959 | using __type | |
1960 | = typename __make_signed_selector<wchar_t, false, true>::__type; | |
1961 | }; | |
22f1f4c7 | 1962 | |
c124af93 TH |
1963 | #if defined(_GLIBCXX_USE_CHAR8_T) |
1964 | template<> | |
1965 | struct __make_signed<char8_t> | |
1966 | { | |
1967 | using __type | |
1968 | = typename __make_signed_selector<char8_t, false, true>::__type; | |
1969 | }; | |
1970 | #endif | |
1971 | ||
22f1f4c7 JW |
1972 | template<> |
1973 | struct __make_signed<char16_t> | |
1974 | { | |
1975 | using __type | |
1976 | = typename __make_signed_selector<char16_t, false, true>::__type; | |
1977 | }; | |
1978 | ||
1979 | template<> | |
1980 | struct __make_signed<char32_t> | |
1981 | { | |
1982 | using __type | |
1983 | = typename __make_signed_selector<char32_t, false, true>::__type; | |
1984 | }; | |
6963c3b9 | 1985 | /// @endcond |
22f1f4c7 | 1986 | |
7b50cdef BK |
1987 | // Given an integral/enum type, return the corresponding signed |
1988 | // integer type. | |
5b9daa7e BK |
1989 | // Primary template. |
1990 | /// make_signed | |
7b50cdef | 1991 | template<typename _Tp> |
33ac58d5 | 1992 | struct make_signed |
7b50cdef BK |
1993 | { typedef typename __make_signed_selector<_Tp>::__type type; }; |
1994 | ||
1995 | // Integral, but don't define. | |
1996 | template<> | |
1997 | struct make_signed<bool>; | |
cfa9a96b | 1998 | |
4457e88c JW |
1999 | #if __cplusplus > 201103L |
2000 | /// Alias template for make_signed | |
2001 | template<typename _Tp> | |
2002 | using make_signed_t = typename make_signed<_Tp>::type; | |
2003 | ||
2004 | /// Alias template for make_unsigned | |
2005 | template<typename _Tp> | |
2006 | using make_unsigned_t = typename make_unsigned<_Tp>::type; | |
2007 | #endif | |
123c516a | 2008 | |
c0ffa2ba | 2009 | // Array modifications. |
123c516a PC |
2010 | |
2011 | /// remove_extent | |
2012 | template<typename _Tp> | |
2013 | struct remove_extent | |
2014 | { typedef _Tp type; }; | |
2015 | ||
2016 | template<typename _Tp, std::size_t _Size> | |
2017 | struct remove_extent<_Tp[_Size]> | |
2018 | { typedef _Tp type; }; | |
2019 | ||
2020 | template<typename _Tp> | |
2021 | struct remove_extent<_Tp[]> | |
2022 | { typedef _Tp type; }; | |
2023 | ||
2024 | /// remove_all_extents | |
2025 | template<typename _Tp> | |
2026 | struct remove_all_extents | |
2027 | { typedef _Tp type; }; | |
2028 | ||
2029 | template<typename _Tp, std::size_t _Size> | |
2030 | struct remove_all_extents<_Tp[_Size]> | |
2031 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
2032 | ||
2033 | template<typename _Tp> | |
2034 | struct remove_all_extents<_Tp[]> | |
2035 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
2036 | ||
4457e88c JW |
2037 | #if __cplusplus > 201103L |
2038 | /// Alias template for remove_extent | |
2039 | template<typename _Tp> | |
2040 | using remove_extent_t = typename remove_extent<_Tp>::type; | |
2041 | ||
2042 | /// Alias template for remove_all_extents | |
2043 | template<typename _Tp> | |
2044 | using remove_all_extents_t = typename remove_all_extents<_Tp>::type; | |
2045 | #endif | |
123c516a | 2046 | |
c0ffa2ba | 2047 | // Pointer modifications. |
123c516a PC |
2048 | |
2049 | template<typename _Tp, typename> | |
2050 | struct __remove_pointer_helper | |
2051 | { typedef _Tp type; }; | |
2052 | ||
2053 | template<typename _Tp, typename _Up> | |
2054 | struct __remove_pointer_helper<_Tp, _Up*> | |
2055 | { typedef _Up type; }; | |
2056 | ||
2057 | /// remove_pointer | |
2058 | template<typename _Tp> | |
2059 | struct remove_pointer | |
391d5d2e | 2060 | : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>> |
123c516a PC |
2061 | { }; |
2062 | ||
89898034 DK |
2063 | template<typename _Tp, bool = __or_<__is_referenceable<_Tp>, |
2064 | is_void<_Tp>>::value> | |
2065 | struct __add_pointer_helper | |
2066 | { typedef _Tp type; }; | |
2067 | ||
123c516a | 2068 | template<typename _Tp> |
89898034 | 2069 | struct __add_pointer_helper<_Tp, true> |
123c516a PC |
2070 | { typedef typename remove_reference<_Tp>::type* type; }; |
2071 | ||
6963c3b9 | 2072 | /// add_pointer |
89898034 | 2073 | template<typename _Tp> |
33ac58d5 | 2074 | struct add_pointer |
89898034 DK |
2075 | : public __add_pointer_helper<_Tp> |
2076 | { }; | |
2077 | ||
4457e88c JW |
2078 | #if __cplusplus > 201103L |
2079 | /// Alias template for remove_pointer | |
2080 | template<typename _Tp> | |
2081 | using remove_pointer_t = typename remove_pointer<_Tp>::type; | |
2082 | ||
2083 | /// Alias template for add_pointer | |
2084 | template<typename _Tp> | |
2085 | using add_pointer_t = typename add_pointer<_Tp>::type; | |
2086 | #endif | |
123c516a PC |
2087 | |
2088 | template<std::size_t _Len> | |
2089 | struct __aligned_storage_msa | |
33ac58d5 | 2090 | { |
123c516a PC |
2091 | union __type |
2092 | { | |
2093 | unsigned char __data[_Len]; | |
33ac58d5 | 2094 | struct __attribute__((__aligned__)) { } __align; |
123c516a PC |
2095 | }; |
2096 | }; | |
2097 | ||
2098 | /** | |
2099 | * @brief Alignment type. | |
2100 | * | |
2101 | * The value of _Align is a default-alignment which shall be the | |
2102 | * most stringent alignment requirement for any C++ object type | |
2103 | * whose size is no greater than _Len (3.9). The member typedef | |
2104 | * type shall be a POD type suitable for use as uninitialized | |
2105 | * storage for any object whose size is at most _Len and whose | |
2106 | * alignment is a divisor of _Align. | |
2107 | */ | |
2108 | template<std::size_t _Len, std::size_t _Align = | |
2109 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2110 | struct aligned_storage | |
33ac58d5 | 2111 | { |
123c516a PC |
2112 | union type |
2113 | { | |
2114 | unsigned char __data[_Len]; | |
33ac58d5 | 2115 | struct __attribute__((__aligned__((_Align)))) { } __align; |
123c516a PC |
2116 | }; |
2117 | }; | |
2118 | ||
d3718027 RS |
2119 | template <typename... _Types> |
2120 | struct __strictest_alignment | |
2121 | { | |
2122 | static const size_t _S_alignment = 0; | |
2123 | static const size_t _S_size = 0; | |
2124 | }; | |
2125 | ||
2126 | template <typename _Tp, typename... _Types> | |
2127 | struct __strictest_alignment<_Tp, _Types...> | |
2128 | { | |
2129 | static const size_t _S_alignment = | |
2130 | alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment | |
2131 | ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment; | |
2132 | static const size_t _S_size = | |
2133 | sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size | |
2134 | ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size; | |
2135 | }; | |
2136 | ||
2137 | /** | |
2138 | * @brief Provide aligned storage for types. | |
2139 | * | |
2140 | * [meta.trans.other] | |
2141 | * | |
2142 | * Provides aligned storage for any of the provided types of at | |
2143 | * least size _Len. | |
2144 | * | |
2145 | * @see aligned_storage | |
2146 | */ | |
2147 | template <size_t _Len, typename... _Types> | |
2148 | struct aligned_union | |
2149 | { | |
2150 | private: | |
2151 | static_assert(sizeof...(_Types) != 0, "At least one type is required"); | |
2152 | ||
2153 | using __strictest = __strictest_alignment<_Types...>; | |
2154 | static const size_t _S_len = _Len > __strictest::_S_size | |
2155 | ? _Len : __strictest::_S_size; | |
2156 | public: | |
2157 | /// The value of the strictest alignment of _Types. | |
2158 | static const size_t alignment_value = __strictest::_S_alignment; | |
2159 | /// The storage. | |
2160 | typedef typename aligned_storage<_S_len, alignment_value>::type type; | |
2161 | }; | |
2162 | ||
2163 | template <size_t _Len, typename... _Types> | |
2164 | const size_t aligned_union<_Len, _Types...>::alignment_value; | |
123c516a | 2165 | |
6963c3b9 JW |
2166 | /// @cond undocumented |
2167 | ||
123c516a PC |
2168 | // Decay trait for arrays and functions, used for perfect forwarding |
2169 | // in make_pair, make_tuple, etc. | |
33ac58d5 | 2170 | template<typename _Up, |
123c516a | 2171 | bool _IsArray = is_array<_Up>::value, |
33ac58d5 | 2172 | bool _IsFunction = is_function<_Up>::value> |
123c516a PC |
2173 | struct __decay_selector; |
2174 | ||
2175 | // NB: DR 705. | |
33ac58d5 | 2176 | template<typename _Up> |
123c516a | 2177 | struct __decay_selector<_Up, false, false> |
391d5d2e | 2178 | { typedef __remove_cv_t<_Up> __type; }; |
123c516a | 2179 | |
33ac58d5 | 2180 | template<typename _Up> |
123c516a PC |
2181 | struct __decay_selector<_Up, true, false> |
2182 | { typedef typename remove_extent<_Up>::type* __type; }; | |
2183 | ||
33ac58d5 | 2184 | template<typename _Up> |
123c516a PC |
2185 | struct __decay_selector<_Up, false, true> |
2186 | { typedef typename add_pointer<_Up>::type __type; }; | |
6963c3b9 | 2187 | /// @endcond |
123c516a PC |
2188 | |
2189 | /// decay | |
33ac58d5 JW |
2190 | template<typename _Tp> |
2191 | class decay | |
2192 | { | |
123c516a PC |
2193 | typedef typename remove_reference<_Tp>::type __remove_type; |
2194 | ||
2195 | public: | |
2196 | typedef typename __decay_selector<__remove_type>::__type type; | |
2197 | }; | |
2198 | ||
6963c3b9 | 2199 | /// @cond undocumented |
123c516a PC |
2200 | |
2201 | // Helper which adds a reference to a type when given a reference_wrapper | |
2202 | template<typename _Tp> | |
2203 | struct __strip_reference_wrapper | |
2204 | { | |
2205 | typedef _Tp __type; | |
2206 | }; | |
2207 | ||
2208 | template<typename _Tp> | |
2209 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
2210 | { | |
2211 | typedef _Tp& __type; | |
2212 | }; | |
2213 | ||
6963c3b9 | 2214 | // __decay_t (std::decay_t for C++11). |
123c516a | 2215 | template<typename _Tp> |
6963c3b9 | 2216 | using __decay_t = typename decay<_Tp>::type; |
123c516a | 2217 | |
6963c3b9 JW |
2218 | template<typename _Tp> |
2219 | using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>; | |
2220 | /// @endcond | |
123c516a | 2221 | |
123c516a | 2222 | // Primary template. |
6963c3b9 | 2223 | /// Define a member typedef `type` only if a boolean constant is true. |
123c516a | 2224 | template<bool, typename _Tp = void> |
33ac58d5 | 2225 | struct enable_if |
123c516a PC |
2226 | { }; |
2227 | ||
2228 | // Partial specialization for true. | |
2229 | template<typename _Tp> | |
2230 | struct enable_if<true, _Tp> | |
2231 | { typedef _Tp type; }; | |
2232 | ||
6963c3b9 JW |
2233 | /// @cond undocumented |
2234 | ||
391d5d2e JW |
2235 | // __enable_if_t (std::enable_if_t for C++11) |
2236 | template<bool _Cond, typename _Tp = void> | |
2237 | using __enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2238 | ||
6963c3b9 | 2239 | // Helper for SFINAE constraints |
23df8534 | 2240 | template<typename... _Cond> |
391d5d2e | 2241 | using _Require = __enable_if_t<__and_<_Cond...>::value>; |
123c516a | 2242 | |
6963c3b9 JW |
2243 | // __remove_cvref_t (std::remove_cvref_t for C++11). |
2244 | template<typename _Tp> | |
2245 | using __remove_cvref_t | |
2246 | = typename remove_cv<typename remove_reference<_Tp>::type>::type; | |
2247 | /// @endcond | |
2248 | ||
123c516a | 2249 | // Primary template. |
13901e4b | 2250 | /// Define a member typedef @c type to one of two argument types. |
123c516a PC |
2251 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2252 | struct conditional | |
2253 | { typedef _Iftrue type; }; | |
2254 | ||
2255 | // Partial specialization for false. | |
2256 | template<typename _Iftrue, typename _Iffalse> | |
2257 | struct conditional<false, _Iftrue, _Iffalse> | |
2258 | { typedef _Iffalse type; }; | |
2259 | ||
5b9daa7e | 2260 | /// common_type |
cfa9a96b CF |
2261 | template<typename... _Tp> |
2262 | struct common_type; | |
2263 | ||
c0ffa2ba | 2264 | // Sfinae-friendly common_type implementation: |
b3618b71 | 2265 | |
6963c3b9 | 2266 | /// @cond undocumented |
b3618b71 DK |
2267 | struct __do_common_type_impl |
2268 | { | |
2269 | template<typename _Tp, typename _Up> | |
f61a12b3 JW |
2270 | using __cond_t |
2271 | = decltype(true ? std::declval<_Tp>() : std::declval<_Up>()); | |
2272 | ||
0f8b14ee JW |
2273 | // if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2274 | // denotes a valid type, let C denote that type. | |
f61a12b3 | 2275 | template<typename _Tp, typename _Up> |
0f8b14ee | 2276 | static __success_type<__decay_t<__cond_t<_Tp, _Up>>> |
f61a12b3 | 2277 | _S_test(int); |
b3618b71 | 2278 | |
0f8b14ee JW |
2279 | #if __cplusplus > 201703L |
2280 | // Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type, | |
2281 | // let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>. | |
2282 | template<typename _Tp, typename _Up> | |
2283 | static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>> | |
2284 | _S_test_2(int); | |
2285 | #endif | |
2286 | ||
b3618b71 | 2287 | template<typename, typename> |
f61a12b3 | 2288 | static __failure_type |
0f8b14ee JW |
2289 | _S_test_2(...); |
2290 | ||
2291 | template<typename _Tp, typename _Up> | |
2292 | static decltype(_S_test_2<_Tp, _Up>(0)) | |
f61a12b3 | 2293 | _S_test(...); |
b3618b71 DK |
2294 | }; |
2295 | ||
f61a12b3 JW |
2296 | // If sizeof...(T) is zero, there shall be no member type. |
2297 | template<> | |
2298 | struct common_type<> | |
2299 | { }; | |
b3618b71 | 2300 | |
f61a12b3 JW |
2301 | // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>. |
2302 | template<typename _Tp0> | |
2303 | struct common_type<_Tp0> | |
2304 | : public common_type<_Tp0, _Tp0> | |
2305 | { }; | |
b3618b71 | 2306 | |
f61a12b3 JW |
2307 | // If sizeof...(T) is two, ... |
2308 | template<typename _Tp1, typename _Tp2, | |
391d5d2e | 2309 | typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>> |
f61a12b3 | 2310 | struct __common_type_impl |
b3618b71 | 2311 | { |
f61a12b3 JW |
2312 | // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false, |
2313 | // let C denote the same type, if any, as common_type_t<D1, D2>. | |
2314 | using type = common_type<_Dp1, _Dp2>; | |
b3618b71 DK |
2315 | }; |
2316 | ||
f61a12b3 JW |
2317 | template<typename _Tp1, typename _Tp2> |
2318 | struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2> | |
2319 | : private __do_common_type_impl | |
b3618b71 | 2320 | { |
f61a12b3 JW |
2321 | // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2322 | // denotes a valid type, let C denote that type. | |
2323 | using type = decltype(_S_test<_Tp1, _Tp2>(0)); | |
b3618b71 DK |
2324 | }; |
2325 | ||
f61a12b3 JW |
2326 | // If sizeof...(T) is two, ... |
2327 | template<typename _Tp1, typename _Tp2> | |
2328 | struct common_type<_Tp1, _Tp2> | |
2329 | : public __common_type_impl<_Tp1, _Tp2>::type | |
2330 | { }; | |
b3618b71 | 2331 | |
f61a12b3 JW |
2332 | template<typename...> |
2333 | struct __common_type_pack | |
373c726e JW |
2334 | { }; |
2335 | ||
f61a12b3 JW |
2336 | template<typename, typename, typename = void> |
2337 | struct __common_type_fold; | |
2338 | ||
2339 | // If sizeof...(T) is greater than two, ... | |
2340 | template<typename _Tp1, typename _Tp2, typename... _Rp> | |
2341 | struct common_type<_Tp1, _Tp2, _Rp...> | |
2342 | : public __common_type_fold<common_type<_Tp1, _Tp2>, | |
2343 | __common_type_pack<_Rp...>> | |
373c726e | 2344 | { }; |
cfa9a96b | 2345 | |
f61a12b3 JW |
2346 | // Let C denote the same type, if any, as common_type_t<T1, T2>. |
2347 | // If there is such a type C, type shall denote the same type, if any, | |
2348 | // as common_type_t<C, R...>. | |
2349 | template<typename _CTp, typename... _Rp> | |
2350 | struct __common_type_fold<_CTp, __common_type_pack<_Rp...>, | |
2351 | __void_t<typename _CTp::type>> | |
2352 | : public common_type<typename _CTp::type, _Rp...> | |
b3618b71 | 2353 | { }; |
cfa9a96b | 2354 | |
f61a12b3 JW |
2355 | // Otherwise, there shall be no member type. |
2356 | template<typename _CTp, typename _Rp> | |
2357 | struct __common_type_fold<_CTp, _Rp, void> | |
b3618b71 | 2358 | { }; |
7274deff | 2359 | |
3c26b759 JW |
2360 | template<typename _Tp, bool = is_enum<_Tp>::value> |
2361 | struct __underlying_type_impl | |
2362 | { | |
2363 | using type = __underlying_type(_Tp); | |
2364 | }; | |
2365 | ||
2366 | template<typename _Tp> | |
2367 | struct __underlying_type_impl<_Tp, false> | |
2368 | { }; | |
6963c3b9 | 2369 | /// @endcond |
3c26b759 | 2370 | |
13901e4b | 2371 | /// The underlying type of an enum. |
a47407f6 PC |
2372 | template<typename _Tp> |
2373 | struct underlying_type | |
3c26b759 JW |
2374 | : public __underlying_type_impl<_Tp> |
2375 | { }; | |
123c516a | 2376 | |
6963c3b9 | 2377 | /// @cond undocumented |
7274deff PC |
2378 | template<typename _Tp> |
2379 | struct __declval_protector | |
2380 | { | |
2381 | static const bool __stop = false; | |
7274deff | 2382 | }; |
6963c3b9 | 2383 | /// @endcond |
7274deff | 2384 | |
6963c3b9 JW |
2385 | /** Utility to simplify expressions used in unevaluated operands |
2386 | * @since C++11 | |
2387 | * @ingroup utilities | |
2388 | */ | |
7274deff | 2389 | template<typename _Tp> |
ec26ff5a | 2390 | auto declval() noexcept -> decltype(__declval<_Tp>(0)) |
7274deff PC |
2391 | { |
2392 | static_assert(__declval_protector<_Tp>::__stop, | |
2393 | "declval() must not be used!"); | |
ec26ff5a | 2394 | return __declval<_Tp>(0); |
7274deff | 2395 | } |
1041daba | 2396 | |
be7f7822 JW |
2397 | /// result_of |
2398 | template<typename _Signature> | |
0e5abeb0 | 2399 | struct result_of; |
be7f7822 | 2400 | |
c0ffa2ba | 2401 | // Sfinae-friendly result_of implementation: |
83ddb39f | 2402 | |
b8806796 | 2403 | #define __cpp_lib_result_of_sfinae 201210L |
a15f7cb8 | 2404 | |
6963c3b9 | 2405 | /// @cond undocumented |
93e95400 JW |
2406 | struct __invoke_memfun_ref { }; |
2407 | struct __invoke_memfun_deref { }; | |
2408 | struct __invoke_memobj_ref { }; | |
2409 | struct __invoke_memobj_deref { }; | |
2410 | struct __invoke_other { }; | |
2411 | ||
2412 | // Associate a tag type with a specialization of __success_type. | |
2413 | template<typename _Tp, typename _Tag> | |
2414 | struct __result_of_success : __success_type<_Tp> | |
2415 | { using __invoke_type = _Tag; }; | |
2416 | ||
83ddb39f DK |
2417 | // [func.require] paragraph 1 bullet 1: |
2418 | struct __result_of_memfun_ref_impl | |
2419 | { | |
2420 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2421 | static __result_of_success<decltype( |
83ddb39f | 2422 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2423 | ), __invoke_memfun_ref> _S_test(int); |
83ddb39f DK |
2424 | |
2425 | template<typename...> | |
2426 | static __failure_type _S_test(...); | |
2427 | }; | |
2428 | ||
2429 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2430 | struct __result_of_memfun_ref | |
2431 | : private __result_of_memfun_ref_impl | |
2432 | { | |
2433 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2434 | }; | |
2435 | ||
2436 | // [func.require] paragraph 1 bullet 2: | |
2437 | struct __result_of_memfun_deref_impl | |
2438 | { | |
2439 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2440 | static __result_of_success<decltype( |
83ddb39f | 2441 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2442 | ), __invoke_memfun_deref> _S_test(int); |
83ddb39f DK |
2443 | |
2444 | template<typename...> | |
2445 | static __failure_type _S_test(...); | |
2446 | }; | |
2447 | ||
2448 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2449 | struct __result_of_memfun_deref | |
2450 | : private __result_of_memfun_deref_impl | |
2451 | { | |
2452 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2453 | }; | |
2454 | ||
2455 | // [func.require] paragraph 1 bullet 3: | |
2456 | struct __result_of_memobj_ref_impl | |
2457 | { | |
2458 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2459 | static __result_of_success<decltype( |
83ddb39f | 2460 | std::declval<_Tp1>().*std::declval<_Fp>() |
93e95400 | 2461 | ), __invoke_memobj_ref> _S_test(int); |
83ddb39f DK |
2462 | |
2463 | template<typename, typename> | |
2464 | static __failure_type _S_test(...); | |
2465 | }; | |
2466 | ||
2467 | template<typename _MemPtr, typename _Arg> | |
2468 | struct __result_of_memobj_ref | |
2469 | : private __result_of_memobj_ref_impl | |
2470 | { | |
2471 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2472 | }; | |
2473 | ||
2474 | // [func.require] paragraph 1 bullet 4: | |
2475 | struct __result_of_memobj_deref_impl | |
2476 | { | |
2477 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2478 | static __result_of_success<decltype( |
83ddb39f | 2479 | (*std::declval<_Tp1>()).*std::declval<_Fp>() |
93e95400 | 2480 | ), __invoke_memobj_deref> _S_test(int); |
83ddb39f DK |
2481 | |
2482 | template<typename, typename> | |
2483 | static __failure_type _S_test(...); | |
2484 | }; | |
2485 | ||
be7f7822 | 2486 | template<typename _MemPtr, typename _Arg> |
83ddb39f DK |
2487 | struct __result_of_memobj_deref |
2488 | : private __result_of_memobj_deref_impl | |
2489 | { | |
2490 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2491 | }; | |
2492 | ||
2493 | template<typename _MemPtr, typename _Arg> | |
2494 | struct __result_of_memobj; | |
be7f7822 JW |
2495 | |
2496 | template<typename _Res, typename _Class, typename _Arg> | |
83ddb39f | 2497 | struct __result_of_memobj<_Res _Class::*, _Arg> |
be7f7822 | 2498 | { |
6791489e | 2499 | typedef __remove_cvref_t<_Arg> _Argval; |
83ddb39f | 2500 | typedef _Res _Class::* _MemPtr; |
a09bb4a8 | 2501 | typedef typename __conditional_t<__or_<is_same<_Argval, _Class>, |
83ddb39f DK |
2502 | is_base_of<_Class, _Argval>>::value, |
2503 | __result_of_memobj_ref<_MemPtr, _Arg>, | |
2504 | __result_of_memobj_deref<_MemPtr, _Arg> | |
a09bb4a8 | 2505 | >::type type; |
be7f7822 JW |
2506 | }; |
2507 | ||
83ddb39f DK |
2508 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2509 | struct __result_of_memfun; | |
be7f7822 JW |
2510 | |
2511 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
83ddb39f | 2512 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
be7f7822 | 2513 | { |
81c7cf71 | 2514 | typedef typename remove_reference<_Arg>::type _Argval; |
83ddb39f | 2515 | typedef _Res _Class::* _MemPtr; |
a09bb4a8 | 2516 | typedef typename __conditional_t<is_base_of<_Class, _Argval>::value, |
83ddb39f DK |
2517 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, |
2518 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> | |
a09bb4a8 | 2519 | >::type type; |
be7f7822 JW |
2520 | }; |
2521 | ||
93e95400 JW |
2522 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
2523 | // 2219. INVOKE-ing a pointer to member with a reference_wrapper | |
2524 | // as the object expression | |
93e95400 | 2525 | |
7dcc645c | 2526 | // Used by result_of, invoke etc. to unwrap a reference_wrapper. |
81c7cf71 | 2527 | template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>> |
7dcc645c JW |
2528 | struct __inv_unwrap |
2529 | { | |
2530 | using type = _Tp; | |
2531 | }; | |
f3d7dd52 | 2532 | |
7dcc645c JW |
2533 | template<typename _Tp, typename _Up> |
2534 | struct __inv_unwrap<_Tp, reference_wrapper<_Up>> | |
2535 | { | |
2536 | using type = _Up&; | |
2537 | }; | |
93e95400 | 2538 | |
be7f7822 | 2539 | template<bool, bool, typename _Functor, typename... _ArgTypes> |
83ddb39f | 2540 | struct __result_of_impl |
be7f7822 | 2541 | { |
83ddb39f | 2542 | typedef __failure_type type; |
be7f7822 JW |
2543 | }; |
2544 | ||
2545 | template<typename _MemPtr, typename _Arg> | |
83ddb39f | 2546 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
391d5d2e | 2547 | : public __result_of_memobj<__decay_t<_MemPtr>, |
7dcc645c | 2548 | typename __inv_unwrap<_Arg>::type> |
c4db9a77 | 2549 | { }; |
be7f7822 | 2550 | |
83ddb39f DK |
2551 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2552 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> | |
391d5d2e | 2553 | : public __result_of_memfun<__decay_t<_MemPtr>, |
7dcc645c | 2554 | typename __inv_unwrap<_Arg>::type, _Args...> |
c4db9a77 | 2555 | { }; |
be7f7822 | 2556 | |
83ddb39f DK |
2557 | // [func.require] paragraph 1 bullet 5: |
2558 | struct __result_of_other_impl | |
2559 | { | |
2560 | template<typename _Fn, typename... _Args> | |
93e95400 | 2561 | static __result_of_success<decltype( |
83ddb39f | 2562 | std::declval<_Fn>()(std::declval<_Args>()...) |
93e95400 | 2563 | ), __invoke_other> _S_test(int); |
83ddb39f DK |
2564 | |
2565 | template<typename...> | |
2566 | static __failure_type _S_test(...); | |
2567 | }; | |
2568 | ||
be7f7822 | 2569 | template<typename _Functor, typename... _ArgTypes> |
83ddb39f DK |
2570 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2571 | : private __result_of_other_impl | |
be7f7822 | 2572 | { |
83ddb39f | 2573 | typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
be7f7822 JW |
2574 | }; |
2575 | ||
7dcc645c | 2576 | // __invoke_result (std::invoke_result for C++11) |
83ddb39f | 2577 | template<typename _Functor, typename... _ArgTypes> |
7dcc645c | 2578 | struct __invoke_result |
83ddb39f DK |
2579 | : public __result_of_impl< |
2580 | is_member_object_pointer< | |
2581 | typename remove_reference<_Functor>::type | |
2582 | >::value, | |
2583 | is_member_function_pointer< | |
2584 | typename remove_reference<_Functor>::type | |
2585 | >::value, | |
7dcc645c | 2586 | _Functor, _ArgTypes... |
83ddb39f DK |
2587 | >::type |
2588 | { }; | |
6963c3b9 | 2589 | /// @endcond |
c0ffa2ba | 2590 | |
7dcc645c JW |
2591 | template<typename _Functor, typename... _ArgTypes> |
2592 | struct result_of<_Functor(_ArgTypes...)> | |
2593 | : public __invoke_result<_Functor, _ArgTypes...> | |
de196e5d | 2594 | { } _GLIBCXX17_DEPRECATED_SUGGEST("std::invoke_result"); |
7dcc645c | 2595 | |
e112d53a | 2596 | #if __cplusplus >= 201402L |
4457e88c JW |
2597 | /// Alias template for aligned_storage |
2598 | template<size_t _Len, size_t _Align = | |
2599 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2600 | using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; | |
2601 | ||
d3718027 RS |
2602 | template <size_t _Len, typename... _Types> |
2603 | using aligned_union_t = typename aligned_union<_Len, _Types...>::type; | |
2604 | ||
4457e88c JW |
2605 | /// Alias template for decay |
2606 | template<typename _Tp> | |
2607 | using decay_t = typename decay<_Tp>::type; | |
2608 | ||
2609 | /// Alias template for enable_if | |
2610 | template<bool _Cond, typename _Tp = void> | |
2611 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2612 | ||
2613 | /// Alias template for conditional | |
2614 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
2615 | using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type; | |
2616 | ||
2617 | /// Alias template for common_type | |
2618 | template<typename... _Tp> | |
2619 | using common_type_t = typename common_type<_Tp...>::type; | |
2620 | ||
2621 | /// Alias template for underlying_type | |
2622 | template<typename _Tp> | |
2623 | using underlying_type_t = typename underlying_type<_Tp>::type; | |
2624 | ||
2625 | /// Alias template for result_of | |
2626 | template<typename _Tp> | |
2627 | using result_of_t = typename result_of<_Tp>::type; | |
e112d53a JW |
2628 | #endif // C++14 |
2629 | ||
e112d53a | 2630 | #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11 |
b8806796 | 2631 | #define __cpp_lib_void_t 201411L |
bd1eb5e0 JW |
2632 | /// A metafunction that always yields void, used for detecting valid types. |
2633 | template<typename...> using void_t = void; | |
2634 | #endif | |
2635 | ||
6963c3b9 JW |
2636 | /// @cond undocumented |
2637 | ||
6af6bef4 JW |
2638 | /// Implementation of the detection idiom (negative case). |
2639 | template<typename _Default, typename _AlwaysVoid, | |
2640 | template<typename...> class _Op, typename... _Args> | |
2641 | struct __detector | |
2642 | { | |
2643 | using value_t = false_type; | |
2644 | using type = _Default; | |
2645 | }; | |
2646 | ||
2647 | /// Implementation of the detection idiom (positive case). | |
2648 | template<typename _Default, template<typename...> class _Op, | |
2649 | typename... _Args> | |
2650 | struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...> | |
2651 | { | |
2652 | using value_t = true_type; | |
2653 | using type = _Op<_Args...>; | |
2654 | }; | |
2655 | ||
2656 | // Detect whether _Op<_Args...> is a valid type, use _Default if not. | |
2657 | template<typename _Default, template<typename...> class _Op, | |
2658 | typename... _Args> | |
2659 | using __detected_or = __detector<_Default, void, _Op, _Args...>; | |
2660 | ||
2661 | // _Op<_Args...> if that is a valid type, otherwise _Default. | |
2662 | template<typename _Default, template<typename...> class _Op, | |
2663 | typename... _Args> | |
2664 | using __detected_or_t | |
2665 | = typename __detected_or<_Default, _Op, _Args...>::type; | |
2666 | ||
033b71ce PC |
2667 | /** |
2668 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
2669 | * member type _NTYPE. | |
2670 | */ | |
82b12c4b | 2671 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ |
847e9cf8 | 2672 | template<typename _Tp, typename = __void_t<>> \ |
82b12c4b | 2673 | struct __has_##_NTYPE \ |
847e9cf8 JW |
2674 | : false_type \ |
2675 | { }; \ | |
2676 | template<typename _Tp> \ | |
2677 | struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \ | |
2678 | : true_type \ | |
033b71ce PC |
2679 | { }; |
2680 | ||
26b5ace7 DK |
2681 | template <typename _Tp> |
2682 | struct __is_swappable; | |
ddb63209 | 2683 | |
26b5ace7 DK |
2684 | template <typename _Tp> |
2685 | struct __is_nothrow_swappable; | |
ddb63209 | 2686 | |
a2863bde VV |
2687 | template<typename> |
2688 | struct __is_tuple_like_impl : false_type | |
2689 | { }; | |
2690 | ||
a2863bde VV |
2691 | // Internal type trait that allows us to sfinae-protect tuple_cat. |
2692 | template<typename _Tp> | |
2693 | struct __is_tuple_like | |
6791489e | 2694 | : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type |
a2863bde | 2695 | { }; |
6963c3b9 | 2696 | /// @endcond |
a2863bde | 2697 | |
ddb63209 | 2698 | template<typename _Tp> |
7a91c710 | 2699 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2700 | inline |
391d5d2e JW |
2701 | _Require<__not_<__is_tuple_like<_Tp>>, |
2702 | is_move_constructible<_Tp>, | |
2703 | is_move_assignable<_Tp>> | |
ddb63209 VV |
2704 | swap(_Tp&, _Tp&) |
2705 | noexcept(__and_<is_nothrow_move_constructible<_Tp>, | |
2706 | is_nothrow_move_assignable<_Tp>>::value); | |
2707 | ||
2708 | template<typename _Tp, size_t _Nm> | |
7a91c710 | 2709 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2710 | inline |
391d5d2e | 2711 | __enable_if_t<__is_swappable<_Tp>::value> |
ddb63209 | 2712 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) |
26b5ace7 | 2713 | noexcept(__is_nothrow_swappable<_Tp>::value); |
ddb63209 | 2714 | |
6963c3b9 | 2715 | /// @cond undocumented |
26b5ace7 | 2716 | namespace __swappable_details { |
ddb63209 VV |
2717 | using std::swap; |
2718 | ||
26b5ace7 DK |
2719 | struct __do_is_swappable_impl |
2720 | { | |
2721 | template<typename _Tp, typename | |
2722 | = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))> | |
2723 | static true_type __test(int); | |
2724 | ||
2725 | template<typename> | |
2726 | static false_type __test(...); | |
2727 | }; | |
2728 | ||
2729 | struct __do_is_nothrow_swappable_impl | |
2730 | { | |
2731 | template<typename _Tp> | |
2732 | static __bool_constant< | |
2733 | noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>())) | |
2734 | > __test(int); | |
2735 | ||
2736 | template<typename> | |
2737 | static false_type __test(...); | |
2738 | }; | |
2739 | ||
6b9539e2 | 2740 | } // namespace __swappable_details |
ddb63209 | 2741 | |
26b5ace7 DK |
2742 | template<typename _Tp> |
2743 | struct __is_swappable_impl | |
2744 | : public __swappable_details::__do_is_swappable_impl | |
2745 | { | |
2746 | typedef decltype(__test<_Tp>(0)) type; | |
2747 | }; | |
2748 | ||
2749 | template<typename _Tp> | |
ddb63209 | 2750 | struct __is_nothrow_swappable_impl |
26b5ace7 DK |
2751 | : public __swappable_details::__do_is_nothrow_swappable_impl |
2752 | { | |
2753 | typedef decltype(__test<_Tp>(0)) type; | |
2754 | }; | |
ddb63209 | 2755 | |
26b5ace7 DK |
2756 | template<typename _Tp> |
2757 | struct __is_swappable | |
2758 | : public __is_swappable_impl<_Tp>::type | |
ddb63209 VV |
2759 | { }; |
2760 | ||
26b5ace7 | 2761 | template<typename _Tp> |
ddb63209 | 2762 | struct __is_nothrow_swappable |
26b5ace7 | 2763 | : public __is_nothrow_swappable_impl<_Tp>::type |
ddb63209 | 2764 | { }; |
6963c3b9 | 2765 | /// @endcond |
ddb63209 | 2766 | |
6b9539e2 | 2767 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
b8806796 | 2768 | #define __cpp_lib_is_swappable 201603L |
6b9539e2 DK |
2769 | /// Metafunctions used for detecting swappable types: p0185r1 |
2770 | ||
2771 | /// is_swappable | |
2772 | template<typename _Tp> | |
2773 | struct is_swappable | |
2774 | : public __is_swappable_impl<_Tp>::type | |
608a080c AP |
2775 | { |
2776 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2777 | "template argument must be a complete class or an unbounded array"); | |
2778 | }; | |
6b9539e2 DK |
2779 | |
2780 | /// is_nothrow_swappable | |
2781 | template<typename _Tp> | |
2782 | struct is_nothrow_swappable | |
2783 | : public __is_nothrow_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 | #if __cplusplus >= 201402L | |
2790 | /// is_swappable_v | |
2791 | template<typename _Tp> | |
288695f7 DK |
2792 | _GLIBCXX17_INLINE constexpr bool is_swappable_v = |
2793 | is_swappable<_Tp>::value; | |
6b9539e2 DK |
2794 | |
2795 | /// is_nothrow_swappable_v | |
2796 | template<typename _Tp> | |
288695f7 DK |
2797 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v = |
2798 | is_nothrow_swappable<_Tp>::value; | |
6b9539e2 DK |
2799 | #endif // __cplusplus >= 201402L |
2800 | ||
6963c3b9 | 2801 | /// @cond undocumented |
6b9539e2 DK |
2802 | namespace __swappable_with_details { |
2803 | using std::swap; | |
2804 | ||
2805 | struct __do_is_swappable_with_impl | |
2806 | { | |
2807 | template<typename _Tp, typename _Up, typename | |
2808 | = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), | |
2809 | typename | |
2810 | = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> | |
2811 | static true_type __test(int); | |
2812 | ||
2813 | template<typename, typename> | |
2814 | static false_type __test(...); | |
2815 | }; | |
2816 | ||
2817 | struct __do_is_nothrow_swappable_with_impl | |
2818 | { | |
2819 | template<typename _Tp, typename _Up> | |
2820 | static __bool_constant< | |
2821 | noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) | |
2822 | && | |
2823 | noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())) | |
2824 | > __test(int); | |
2825 | ||
2826 | template<typename, typename> | |
2827 | static false_type __test(...); | |
2828 | }; | |
2829 | ||
2830 | } // namespace __swappable_with_details | |
2831 | ||
2832 | template<typename _Tp, typename _Up> | |
2833 | struct __is_swappable_with_impl | |
2834 | : public __swappable_with_details::__do_is_swappable_with_impl | |
2835 | { | |
2836 | typedef decltype(__test<_Tp, _Up>(0)) type; | |
2837 | }; | |
2838 | ||
2839 | // Optimization for the homogenous lvalue case, not required: | |
2840 | template<typename _Tp> | |
2841 | struct __is_swappable_with_impl<_Tp&, _Tp&> | |
2842 | : public __swappable_details::__do_is_swappable_impl | |
2843 | { | |
2844 | typedef decltype(__test<_Tp&>(0)) type; | |
2845 | }; | |
2846 | ||
2847 | template<typename _Tp, typename _Up> | |
2848 | struct __is_nothrow_swappable_with_impl | |
2849 | : public __swappable_with_details::__do_is_nothrow_swappable_with_impl | |
2850 | { | |
2851 | typedef decltype(__test<_Tp, _Up>(0)) type; | |
2852 | }; | |
2853 | ||
2854 | // Optimization for the homogenous lvalue case, not required: | |
2855 | template<typename _Tp> | |
2856 | struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&> | |
2857 | : public __swappable_details::__do_is_nothrow_swappable_impl | |
2858 | { | |
2859 | typedef decltype(__test<_Tp&>(0)) type; | |
2860 | }; | |
6963c3b9 | 2861 | /// @endcond |
6b9539e2 DK |
2862 | |
2863 | /// is_swappable_with | |
2864 | template<typename _Tp, typename _Up> | |
2865 | struct is_swappable_with | |
2866 | : public __is_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2867 | { |
2868 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2869 | "first template argument must be a complete class or an unbounded array"); | |
2870 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2871 | "second template argument must be a complete class or an unbounded array"); | |
2872 | }; | |
6b9539e2 DK |
2873 | |
2874 | /// is_nothrow_swappable_with | |
2875 | template<typename _Tp, typename _Up> | |
2876 | struct is_nothrow_swappable_with | |
2877 | : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2878 | { |
2879 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2880 | "first template argument must be a complete class or an unbounded array"); | |
2881 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2882 | "second template argument must be a complete class or an unbounded array"); | |
2883 | }; | |
6b9539e2 DK |
2884 | |
2885 | #if __cplusplus >= 201402L | |
2886 | /// is_swappable_with_v | |
2887 | template<typename _Tp, typename _Up> | |
288695f7 DK |
2888 | _GLIBCXX17_INLINE constexpr bool is_swappable_with_v = |
2889 | is_swappable_with<_Tp, _Up>::value; | |
6b9539e2 DK |
2890 | |
2891 | /// is_nothrow_swappable_with_v | |
2892 | template<typename _Tp, typename _Up> | |
288695f7 | 2893 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v = |
6b9539e2 DK |
2894 | is_nothrow_swappable_with<_Tp, _Up>::value; |
2895 | #endif // __cplusplus >= 201402L | |
137422c8 | 2896 | |
42183d03 JW |
2897 | #endif// c++1z or gnu++11 |
2898 | ||
6963c3b9 JW |
2899 | /// @cond undocumented |
2900 | ||
7dcc645c | 2901 | // __is_invocable (std::is_invocable for C++11) |
42183d03 | 2902 | |
d91f618d JW |
2903 | // The primary template is used for invalid INVOKE expressions. |
2904 | template<typename _Result, typename _Ret, | |
2905 | bool = is_void<_Ret>::value, typename = void> | |
7dcc645c | 2906 | struct __is_invocable_impl : false_type { }; |
42183d03 | 2907 | |
d91f618d | 2908 | // Used for valid INVOKE and INVOKE<void> expressions. |
42183d03 | 2909 | template<typename _Result, typename _Ret> |
d91f618d JW |
2910 | struct __is_invocable_impl<_Result, _Ret, |
2911 | /* is_void<_Ret> = */ true, | |
2912 | __void_t<typename _Result::type>> | |
2913 | : true_type | |
42183d03 JW |
2914 | { }; |
2915 | ||
d91f618d JW |
2916 | #pragma GCC diagnostic push |
2917 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
2918 | // Used for INVOKE<R> expressions to check the implicit conversion to R. | |
2919 | template<typename _Result, typename _Ret> | |
2920 | struct __is_invocable_impl<_Result, _Ret, | |
2921 | /* is_void<_Ret> = */ false, | |
2922 | __void_t<typename _Result::type>> | |
2923 | { | |
2924 | private: | |
2925 | // The type of the INVOKE expression. | |
2926 | // Unlike declval, this doesn't add_rvalue_reference. | |
2927 | static typename _Result::type _S_get(); | |
2928 | ||
2929 | template<typename _Tp> | |
2930 | static void _S_conv(_Tp); | |
2931 | ||
2932 | // This overload is viable if INVOKE(f, args...) can convert to _Tp. | |
2933 | template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))> | |
2934 | static true_type | |
2935 | _S_test(int); | |
2936 | ||
2937 | template<typename _Tp> | |
2938 | static false_type | |
2939 | _S_test(...); | |
2940 | ||
2941 | public: | |
2942 | using type = decltype(_S_test<_Ret>(1)); | |
2943 | }; | |
2944 | #pragma GCC diagnostic pop | |
2945 | ||
7dcc645c JW |
2946 | template<typename _Fn, typename... _ArgTypes> |
2947 | struct __is_invocable | |
2948 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
42183d03 JW |
2949 | { }; |
2950 | ||
42183d03 JW |
2951 | template<typename _Fn, typename _Tp, typename... _Args> |
2952 | constexpr bool __call_is_nt(__invoke_memfun_ref) | |
2953 | { | |
2954 | using _Up = typename __inv_unwrap<_Tp>::type; | |
2955 | return noexcept((std::declval<_Up>().*std::declval<_Fn>())( | |
2956 | std::declval<_Args>()...)); | |
2957 | } | |
2958 | ||
2959 | template<typename _Fn, typename _Tp, typename... _Args> | |
2960 | constexpr bool __call_is_nt(__invoke_memfun_deref) | |
2961 | { | |
2962 | return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())( | |
2963 | std::declval<_Args>()...)); | |
2964 | } | |
2965 | ||
2966 | template<typename _Fn, typename _Tp> | |
2967 | constexpr bool __call_is_nt(__invoke_memobj_ref) | |
2968 | { | |
2969 | using _Up = typename __inv_unwrap<_Tp>::type; | |
2970 | return noexcept(std::declval<_Up>().*std::declval<_Fn>()); | |
2971 | } | |
2972 | ||
2973 | template<typename _Fn, typename _Tp> | |
2974 | constexpr bool __call_is_nt(__invoke_memobj_deref) | |
2975 | { | |
2976 | return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>()); | |
2977 | } | |
2978 | ||
2979 | template<typename _Fn, typename... _Args> | |
2980 | constexpr bool __call_is_nt(__invoke_other) | |
2981 | { | |
2982 | return noexcept(std::declval<_Fn>()(std::declval<_Args>()...)); | |
2983 | } | |
2984 | ||
7dcc645c | 2985 | template<typename _Result, typename _Fn, typename... _Args> |
42183d03 JW |
2986 | struct __call_is_nothrow |
2987 | : __bool_constant< | |
7dcc645c JW |
2988 | std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{}) |
2989 | > | |
42183d03 JW |
2990 | { }; |
2991 | ||
7dcc645c JW |
2992 | template<typename _Fn, typename... _Args> |
2993 | using __call_is_nothrow_ | |
2994 | = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>; | |
42183d03 | 2995 | |
7dcc645c JW |
2996 | // __is_nothrow_invocable (std::is_nothrow_invocable for C++11) |
2997 | template<typename _Fn, typename... _Args> | |
2998 | struct __is_nothrow_invocable | |
2999 | : __and_<__is_invocable<_Fn, _Args...>, | |
3000 | __call_is_nothrow_<_Fn, _Args...>>::type | |
42183d03 JW |
3001 | { }; |
3002 | ||
cc28d234 JW |
3003 | #pragma GCC diagnostic push |
3004 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
a73d2fa8 NDR |
3005 | struct __nonesuchbase {}; |
3006 | struct __nonesuch : private __nonesuchbase { | |
f524d5b3 VV |
3007 | ~__nonesuch() = delete; |
3008 | __nonesuch(__nonesuch const&) = delete; | |
3009 | void operator=(__nonesuch const&) = delete; | |
3010 | }; | |
cc28d234 | 3011 | #pragma GCC diagnostic pop |
6963c3b9 | 3012 | /// @endcond |
f524d5b3 | 3013 | |
e641ee43 | 3014 | #if __cplusplus >= 201703L |
b8806796 | 3015 | # define __cpp_lib_is_invocable 201703L |
7dcc645c JW |
3016 | |
3017 | /// std::invoke_result | |
3018 | template<typename _Functor, typename... _ArgTypes> | |
3019 | struct invoke_result | |
3020 | : public __invoke_result<_Functor, _ArgTypes...> | |
69f571ff AP |
3021 | { |
3022 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}), | |
3023 | "_Functor must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3024 | static_assert((std::__is_complete_or_unbounded( |
3025 | __type_identity<_ArgTypes>{}) && ...), | |
3026 | "each argument type must be a complete class or an unbounded array"); | |
69f571ff | 3027 | }; |
7dcc645c JW |
3028 | |
3029 | /// std::invoke_result_t | |
3030 | template<typename _Fn, typename... _Args> | |
3031 | using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; | |
42183d03 | 3032 | |
7dcc645c JW |
3033 | /// std::is_invocable |
3034 | template<typename _Fn, typename... _ArgTypes> | |
3035 | struct is_invocable | |
3036 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
608a080c AP |
3037 | { |
3038 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3039 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3040 | static_assert((std::__is_complete_or_unbounded( |
3041 | __type_identity<_ArgTypes>{}) && ...), | |
3042 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3043 | }; |
42183d03 | 3044 | |
7dcc645c JW |
3045 | /// std::is_invocable_r |
3046 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3047 | struct is_invocable_r | |
3048 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type | |
608a080c AP |
3049 | { |
3050 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3051 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3052 | static_assert((std::__is_complete_or_unbounded( |
3053 | __type_identity<_ArgTypes>{}) && ...), | |
3054 | "each argument type must be a complete class or an unbounded array"); | |
3055 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3056 | "_Ret must be a complete class or an unbounded array"); | |
608a080c | 3057 | }; |
42183d03 | 3058 | |
7dcc645c JW |
3059 | /// std::is_nothrow_invocable |
3060 | template<typename _Fn, typename... _ArgTypes> | |
3061 | struct is_nothrow_invocable | |
3062 | : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>, | |
608a080c AP |
3063 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
3064 | { | |
3065 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3066 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3067 | static_assert((std::__is_complete_or_unbounded( |
3068 | __type_identity<_ArgTypes>{}) && ...), | |
3069 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3070 | }; |
42183d03 | 3071 | |
6963c3b9 | 3072 | /// @cond undocumented |
c4b06e7f JW |
3073 | template<typename _Result, typename _Ret, typename = void> |
3074 | struct __is_nt_invocable_impl : false_type { }; | |
3075 | ||
3076 | template<typename _Result, typename _Ret> | |
3077 | struct __is_nt_invocable_impl<_Result, _Ret, | |
3078 | __void_t<typename _Result::type>> | |
91d01b33 | 3079 | : __or_<is_void<_Ret>, |
ce9f305e | 3080 | __is_nothrow_convertible<typename _Result::type, _Ret>> |
c4b06e7f | 3081 | { }; |
6963c3b9 | 3082 | /// @endcond |
c4b06e7f | 3083 | |
7dcc645c JW |
3084 | /// std::is_nothrow_invocable_r |
3085 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3086 | struct is_nothrow_invocable_r | |
c4b06e7f | 3087 | : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>, |
7dcc645c | 3088 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
69f571ff AP |
3089 | { |
3090 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3091 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3092 | static_assert((std::__is_complete_or_unbounded( |
3093 | __type_identity<_ArgTypes>{}) && ...), | |
3094 | "each argument type must be a complete class or an unbounded array"); | |
3095 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3096 | "_Ret must be a complete class or an unbounded array"); | |
69f571ff | 3097 | }; |
7dcc645c | 3098 | #endif // C++17 |
42183d03 | 3099 | |
e641ee43 | 3100 | #if __cplusplus >= 201703L |
068c8ac1 | 3101 | # define __cpp_lib_type_trait_variable_templates 201510L |
6963c3b9 | 3102 | /** |
da89dfc2 | 3103 | * @defgroup variable_templates Variable templates for type traits |
6963c3b9 JW |
3104 | * @ingroup metaprogramming |
3105 | * | |
da89dfc2 JW |
3106 | * Each variable `is_xxx_v<T>` is a boolean constant with the same value |
3107 | * as the `value` member of the corresponding type trait `is_xxx<T>`. | |
6963c3b9 | 3108 | * |
aba938d6 | 3109 | * @since C++17 unless noted otherwise. |
6963c3b9 JW |
3110 | */ |
3111 | ||
da89dfc2 | 3112 | /** |
6963c3b9 | 3113 | * @{ |
da89dfc2 | 3114 | * @ingroup variable_templates |
6963c3b9 | 3115 | */ |
137422c8 | 3116 | template <typename _Tp> |
288695f7 | 3117 | inline constexpr bool is_void_v = is_void<_Tp>::value; |
137422c8 | 3118 | template <typename _Tp> |
288695f7 | 3119 | inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; |
137422c8 | 3120 | template <typename _Tp> |
288695f7 | 3121 | inline constexpr bool is_integral_v = is_integral<_Tp>::value; |
137422c8 | 3122 | template <typename _Tp> |
288695f7 | 3123 | inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; |
137422c8 | 3124 | template <typename _Tp> |
288695f7 | 3125 | inline constexpr bool is_array_v = is_array<_Tp>::value; |
137422c8 | 3126 | template <typename _Tp> |
288695f7 | 3127 | inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; |
137422c8 | 3128 | template <typename _Tp> |
288695f7 DK |
3129 | inline constexpr bool is_lvalue_reference_v = |
3130 | is_lvalue_reference<_Tp>::value; | |
137422c8 | 3131 | template <typename _Tp> |
288695f7 DK |
3132 | inline constexpr bool is_rvalue_reference_v = |
3133 | is_rvalue_reference<_Tp>::value; | |
137422c8 | 3134 | template <typename _Tp> |
288695f7 | 3135 | inline constexpr bool is_member_object_pointer_v = |
137422c8 VV |
3136 | is_member_object_pointer<_Tp>::value; |
3137 | template <typename _Tp> | |
288695f7 | 3138 | inline constexpr bool is_member_function_pointer_v = |
137422c8 VV |
3139 | is_member_function_pointer<_Tp>::value; |
3140 | template <typename _Tp> | |
288695f7 | 3141 | inline constexpr bool is_enum_v = is_enum<_Tp>::value; |
137422c8 | 3142 | template <typename _Tp> |
288695f7 | 3143 | inline constexpr bool is_union_v = is_union<_Tp>::value; |
137422c8 | 3144 | template <typename _Tp> |
288695f7 | 3145 | inline constexpr bool is_class_v = is_class<_Tp>::value; |
137422c8 | 3146 | template <typename _Tp> |
288695f7 | 3147 | inline constexpr bool is_function_v = is_function<_Tp>::value; |
137422c8 | 3148 | template <typename _Tp> |
288695f7 | 3149 | inline constexpr bool is_reference_v = is_reference<_Tp>::value; |
137422c8 | 3150 | template <typename _Tp> |
288695f7 | 3151 | inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; |
137422c8 | 3152 | template <typename _Tp> |
288695f7 | 3153 | inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; |
137422c8 | 3154 | template <typename _Tp> |
288695f7 | 3155 | inline constexpr bool is_object_v = is_object<_Tp>::value; |
137422c8 | 3156 | template <typename _Tp> |
288695f7 | 3157 | inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; |
137422c8 | 3158 | template <typename _Tp> |
288695f7 | 3159 | inline constexpr bool is_compound_v = is_compound<_Tp>::value; |
137422c8 | 3160 | template <typename _Tp> |
288695f7 | 3161 | inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; |
137422c8 | 3162 | template <typename _Tp> |
288695f7 | 3163 | inline constexpr bool is_const_v = is_const<_Tp>::value; |
137422c8 | 3164 | template <typename _Tp> |
288695f7 | 3165 | inline constexpr bool is_volatile_v = is_volatile<_Tp>::value; |
137422c8 | 3166 | template <typename _Tp> |
288695f7 | 3167 | inline constexpr bool is_trivial_v = is_trivial<_Tp>::value; |
137422c8 | 3168 | template <typename _Tp> |
288695f7 DK |
3169 | inline constexpr bool is_trivially_copyable_v = |
3170 | is_trivially_copyable<_Tp>::value; | |
137422c8 | 3171 | template <typename _Tp> |
288695f7 | 3172 | inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value; |
caa39b2e JW |
3173 | #pragma GCC diagnostic push |
3174 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
137422c8 | 3175 | template <typename _Tp> |
1a6c5064 | 3176 | _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead") |
288695f7 | 3177 | inline constexpr bool is_pod_v = is_pod<_Tp>::value; |
137422c8 | 3178 | template <typename _Tp> |
24b54628 | 3179 | _GLIBCXX17_DEPRECATED |
288695f7 | 3180 | inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value; |
24b54628 VV |
3181 | #pragma GCC diagnostic pop |
3182 | template <typename _Tp> | |
288695f7 | 3183 | inline constexpr bool is_empty_v = is_empty<_Tp>::value; |
137422c8 | 3184 | template <typename _Tp> |
288695f7 | 3185 | inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value; |
137422c8 | 3186 | template <typename _Tp> |
288695f7 | 3187 | inline constexpr bool is_abstract_v = is_abstract<_Tp>::value; |
137422c8 | 3188 | template <typename _Tp> |
288695f7 | 3189 | inline constexpr bool is_final_v = is_final<_Tp>::value; |
137422c8 | 3190 | template <typename _Tp> |
288695f7 | 3191 | inline constexpr bool is_signed_v = is_signed<_Tp>::value; |
137422c8 | 3192 | template <typename _Tp> |
288695f7 | 3193 | inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; |
137422c8 | 3194 | template <typename _Tp, typename... _Args> |
288695f7 DK |
3195 | inline constexpr bool is_constructible_v = |
3196 | is_constructible<_Tp, _Args...>::value; | |
137422c8 | 3197 | template <typename _Tp> |
288695f7 | 3198 | inline constexpr bool is_default_constructible_v = |
137422c8 VV |
3199 | is_default_constructible<_Tp>::value; |
3200 | template <typename _Tp> | |
288695f7 DK |
3201 | inline constexpr bool is_copy_constructible_v = |
3202 | is_copy_constructible<_Tp>::value; | |
137422c8 | 3203 | template <typename _Tp> |
288695f7 DK |
3204 | inline constexpr bool is_move_constructible_v = |
3205 | is_move_constructible<_Tp>::value; | |
137422c8 | 3206 | template <typename _Tp, typename _Up> |
288695f7 | 3207 | inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value; |
137422c8 | 3208 | template <typename _Tp> |
288695f7 | 3209 | inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value; |
137422c8 | 3210 | template <typename _Tp> |
288695f7 | 3211 | inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value; |
137422c8 | 3212 | template <typename _Tp> |
288695f7 | 3213 | inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; |
137422c8 | 3214 | template <typename _Tp, typename... _Args> |
288695f7 | 3215 | inline constexpr bool is_trivially_constructible_v = |
137422c8 VV |
3216 | is_trivially_constructible<_Tp, _Args...>::value; |
3217 | template <typename _Tp> | |
288695f7 | 3218 | inline constexpr bool is_trivially_default_constructible_v = |
137422c8 VV |
3219 | is_trivially_default_constructible<_Tp>::value; |
3220 | template <typename _Tp> | |
288695f7 | 3221 | inline constexpr bool is_trivially_copy_constructible_v = |
137422c8 VV |
3222 | is_trivially_copy_constructible<_Tp>::value; |
3223 | template <typename _Tp> | |
288695f7 | 3224 | inline constexpr bool is_trivially_move_constructible_v = |
137422c8 VV |
3225 | is_trivially_move_constructible<_Tp>::value; |
3226 | template <typename _Tp, typename _Up> | |
288695f7 | 3227 | inline constexpr bool is_trivially_assignable_v = |
137422c8 VV |
3228 | is_trivially_assignable<_Tp, _Up>::value; |
3229 | template <typename _Tp> | |
288695f7 | 3230 | inline constexpr bool is_trivially_copy_assignable_v = |
137422c8 VV |
3231 | is_trivially_copy_assignable<_Tp>::value; |
3232 | template <typename _Tp> | |
288695f7 | 3233 | inline constexpr bool is_trivially_move_assignable_v = |
137422c8 VV |
3234 | is_trivially_move_assignable<_Tp>::value; |
3235 | template <typename _Tp> | |
288695f7 | 3236 | inline constexpr bool is_trivially_destructible_v = |
137422c8 VV |
3237 | is_trivially_destructible<_Tp>::value; |
3238 | template <typename _Tp, typename... _Args> | |
288695f7 | 3239 | inline constexpr bool is_nothrow_constructible_v = |
137422c8 VV |
3240 | is_nothrow_constructible<_Tp, _Args...>::value; |
3241 | template <typename _Tp> | |
288695f7 | 3242 | inline constexpr bool is_nothrow_default_constructible_v = |
137422c8 VV |
3243 | is_nothrow_default_constructible<_Tp>::value; |
3244 | template <typename _Tp> | |
288695f7 | 3245 | inline constexpr bool is_nothrow_copy_constructible_v = |
137422c8 VV |
3246 | is_nothrow_copy_constructible<_Tp>::value; |
3247 | template <typename _Tp> | |
288695f7 | 3248 | inline constexpr bool is_nothrow_move_constructible_v = |
137422c8 VV |
3249 | is_nothrow_move_constructible<_Tp>::value; |
3250 | template <typename _Tp, typename _Up> | |
288695f7 | 3251 | inline constexpr bool is_nothrow_assignable_v = |
137422c8 VV |
3252 | is_nothrow_assignable<_Tp, _Up>::value; |
3253 | template <typename _Tp> | |
288695f7 | 3254 | inline constexpr bool is_nothrow_copy_assignable_v = |
137422c8 VV |
3255 | is_nothrow_copy_assignable<_Tp>::value; |
3256 | template <typename _Tp> | |
288695f7 | 3257 | inline constexpr bool is_nothrow_move_assignable_v = |
137422c8 VV |
3258 | is_nothrow_move_assignable<_Tp>::value; |
3259 | template <typename _Tp> | |
288695f7 | 3260 | inline constexpr bool is_nothrow_destructible_v = |
137422c8 VV |
3261 | is_nothrow_destructible<_Tp>::value; |
3262 | template <typename _Tp> | |
288695f7 | 3263 | inline constexpr bool has_virtual_destructor_v = |
137422c8 VV |
3264 | has_virtual_destructor<_Tp>::value; |
3265 | template <typename _Tp> | |
288695f7 | 3266 | inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; |
137422c8 | 3267 | template <typename _Tp> |
288695f7 | 3268 | inline constexpr size_t rank_v = rank<_Tp>::value; |
137422c8 | 3269 | template <typename _Tp, unsigned _Idx = 0> |
288695f7 | 3270 | inline constexpr size_t extent_v = extent<_Tp, _Idx>::value; |
73ae6eb5 | 3271 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
137422c8 | 3272 | template <typename _Tp, typename _Up> |
73ae6eb5 | 3273 | inline constexpr bool is_same_v = __is_same(_Tp, _Up); |
44af818f JW |
3274 | #else |
3275 | template <typename _Tp, typename _Up> | |
3276 | inline constexpr bool is_same_v = std::is_same<_Tp, _Up>::value; | |
3277 | #endif | |
137422c8 | 3278 | template <typename _Base, typename _Derived> |
288695f7 | 3279 | inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value; |
137422c8 | 3280 | template <typename _From, typename _To> |
288695f7 | 3281 | inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; |
6963c3b9 JW |
3282 | template<typename _Fn, typename... _Args> |
3283 | inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; | |
3284 | template<typename _Fn, typename... _Args> | |
3285 | inline constexpr bool is_nothrow_invocable_v | |
3286 | = is_nothrow_invocable<_Fn, _Args...>::value; | |
3287 | template<typename _Ret, typename _Fn, typename... _Args> | |
3288 | inline constexpr bool is_invocable_r_v | |
3289 | = is_invocable_r<_Ret, _Fn, _Args...>::value; | |
3290 | template<typename _Ret, typename _Fn, typename... _Args> | |
3291 | inline constexpr bool is_nothrow_invocable_r_v | |
3292 | = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; | |
3293 | /// @} | |
873c7d5a | 3294 | |
2d763763 | 3295 | #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP |
b8806796 | 3296 | # define __cpp_lib_has_unique_object_representations 201606L |
873c7d5a | 3297 | /// has_unique_object_representations |
aba938d6 | 3298 | /// @since C++17 |
873c7d5a JW |
3299 | template<typename _Tp> |
3300 | struct has_unique_object_representations | |
3301 | : bool_constant<__has_unique_object_representations( | |
3302 | remove_cv_t<remove_all_extents_t<_Tp>> | |
3303 | )> | |
608a080c AP |
3304 | { |
3305 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
3306 | "template argument must be a complete class or an unbounded array"); | |
3307 | }; | |
b0e63d94 | 3308 | |
6963c3b9 | 3309 | /// @ingroup variable_templates |
b0e63d94 JW |
3310 | template<typename _Tp> |
3311 | inline constexpr bool has_unique_object_representations_v | |
3312 | = has_unique_object_representations<_Tp>::value; | |
1f5700e9 | 3313 | #endif |
e2ac6765 | 3314 | |
afa56c17 | 3315 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE |
b8806796 | 3316 | # define __cpp_lib_is_aggregate 201703L |
e2ac6765 | 3317 | /// is_aggregate |
aba938d6 | 3318 | /// @since C++17 |
e2ac6765 VV |
3319 | template<typename _Tp> |
3320 | struct is_aggregate | |
608a080c | 3321 | : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> |
209ee624 | 3322 | { }; |
e2ac6765 | 3323 | |
6963c3b9 | 3324 | /// @ingroup variable_templates |
e2ac6765 VV |
3325 | template<typename _Tp> |
3326 | inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value; | |
3327 | #endif | |
137422c8 | 3328 | #endif // C++17 |
6b9539e2 | 3329 | |
aba938d6 JW |
3330 | #if __cplusplus >= 202002L |
3331 | ||
3332 | /** * Remove references and cv-qualifiers. | |
3333 | * @since C++20 | |
3334 | * @{ | |
3335 | */ | |
56772f62 JW |
3336 | #define __cpp_lib_remove_cvref 201711L |
3337 | ||
6791489e JW |
3338 | template<typename _Tp> |
3339 | struct remove_cvref | |
0e79e630 JW |
3340 | : remove_cv<_Tp> |
3341 | { }; | |
3342 | ||
3343 | template<typename _Tp> | |
3344 | struct remove_cvref<_Tp&> | |
3345 | : remove_cv<_Tp> | |
3346 | { }; | |
3347 | ||
3348 | template<typename _Tp> | |
3349 | struct remove_cvref<_Tp&&> | |
3350 | : remove_cv<_Tp> | |
3351 | { }; | |
6791489e JW |
3352 | |
3353 | template<typename _Tp> | |
0e79e630 | 3354 | using remove_cvref_t = typename remove_cvref<_Tp>::type; |
aba938d6 | 3355 | /// @} |
6791489e | 3356 | |
aba938d6 JW |
3357 | /** * Identity metafunction. |
3358 | * @since C++20 | |
3359 | * @{ | |
3360 | */ | |
56772f62 | 3361 | #define __cpp_lib_type_identity 201806L |
ee896276 JW |
3362 | template<typename _Tp> |
3363 | struct type_identity { using type = _Tp; }; | |
3364 | ||
3365 | template<typename _Tp> | |
3366 | using type_identity_t = typename type_identity<_Tp>::type; | |
aba938d6 | 3367 | /// @} |
ee896276 | 3368 | |
bb54e0b8 JW |
3369 | #define __cpp_lib_unwrap_ref 201811L |
3370 | ||
aba938d6 JW |
3371 | /** Unwrap a reference_wrapper |
3372 | * @since C++20 | |
3373 | * @{ | |
3374 | */ | |
3d18dc9d JW |
3375 | template<typename _Tp> |
3376 | struct unwrap_reference { using type = _Tp; }; | |
3377 | ||
3378 | template<typename _Tp> | |
3379 | struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; }; | |
3380 | ||
82e8c3da JW |
3381 | template<typename _Tp> |
3382 | using unwrap_reference_t = typename unwrap_reference<_Tp>::type; | |
aba938d6 | 3383 | /// @} |
82e8c3da | 3384 | |
aba938d6 JW |
3385 | /** Decay type and if it's a reference_wrapper, unwrap it |
3386 | * @since C++20 | |
3387 | * @{ | |
3388 | */ | |
3d18dc9d | 3389 | template<typename _Tp> |
82e8c3da | 3390 | struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; }; |
3d18dc9d JW |
3391 | |
3392 | template<typename _Tp> | |
3393 | using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type; | |
aba938d6 | 3394 | /// @} |
3d18dc9d | 3395 | |
46610940 JW |
3396 | #define __cpp_lib_bounded_array_traits 201902L |
3397 | ||
28d85efb | 3398 | /// True for a type that is an array of known bound. |
aba938d6 | 3399 | /// @since C++20 |
28d85efb JW |
3400 | template<typename _Tp> |
3401 | struct is_bounded_array | |
3402 | : public __is_array_known_bounds<_Tp> | |
3403 | { }; | |
3404 | ||
3405 | /// True for a type that is an array of unknown bound. | |
aba938d6 | 3406 | /// @since C++20 |
28d85efb JW |
3407 | template<typename _Tp> |
3408 | struct is_unbounded_array | |
3409 | : public __is_array_unknown_bounds<_Tp> | |
3410 | { }; | |
3411 | ||
6963c3b9 | 3412 | /// @ingroup variable_templates |
aba938d6 | 3413 | /// @since C++20 |
28d85efb JW |
3414 | template<typename _Tp> |
3415 | inline constexpr bool is_bounded_array_v | |
3416 | = is_bounded_array<_Tp>::value; | |
3417 | ||
6963c3b9 | 3418 | /// @ingroup variable_templates |
aba938d6 | 3419 | /// @since C++20 |
28d85efb JW |
3420 | template<typename _Tp> |
3421 | inline constexpr bool is_unbounded_array_v | |
3422 | = is_unbounded_array<_Tp>::value; | |
3423 | ||
037ef219 JW |
3424 | #if __has_builtin(__is_layout_compatible) |
3425 | ||
3426 | /// @since C++20 | |
3427 | template<typename _Tp, typename _Up> | |
3428 | struct is_layout_compatible | |
3429 | : bool_constant<__is_layout_compatible(_Tp, _Up)> | |
3430 | { }; | |
3431 | ||
3432 | /// @ingroup variable_templates | |
3433 | /// @since C++20 | |
3434 | template<typename _Tp, typename _Up> | |
3435 | constexpr bool is_layout_compatible_v | |
3436 | = __is_layout_compatible(_Tp, _Up); | |
3437 | ||
3438 | #if __has_builtin(__builtin_is_corresponding_member) | |
3439 | #define __cpp_lib_is_layout_compatible 201907L | |
3440 | ||
3441 | /// @since C++20 | |
3442 | template<typename _S1, typename _S2, typename _M1, typename _M2> | |
3443 | constexpr bool | |
3444 | is_corresponding_member(_M1 _S1::*__m1, _M2 _S2::*__m2) noexcept | |
3445 | { return __builtin_is_corresponding_member(__m1, __m2); } | |
3446 | #endif | |
3447 | #endif | |
3448 | ||
4fa6c0ec JW |
3449 | #if __has_builtin(__is_pointer_interconvertible_base_of) |
3450 | /// True if `_Derived` is standard-layout and has a base class of type `_Base` | |
3451 | /// @since C++20 | |
3452 | template<typename _Base, typename _Derived> | |
3453 | struct is_pointer_interconvertible_base_of | |
3454 | : bool_constant<__is_pointer_interconvertible_base_of(_Base, _Derived)> | |
3455 | { }; | |
3456 | ||
3457 | /// @ingroup variable_templates | |
3458 | /// @since C++20 | |
3459 | template<typename _Base, typename _Derived> | |
3460 | constexpr bool is_pointer_interconvertible_base_of_v | |
3461 | = __is_pointer_interconvertible_base_of(_Base, _Derived); | |
3462 | ||
3463 | #if __has_builtin(__builtin_is_pointer_interconvertible_with_class) | |
3464 | #define __cpp_lib_is_pointer_interconvertible 201907L | |
3465 | ||
3466 | /// True if `__mp` points to the first member of a standard-layout type | |
3467 | /// @returns true if `s.*__mp` is pointer-interconvertible with `s` | |
3468 | /// @since C++20 | |
3469 | template<typename _Tp, typename _Mem> | |
3470 | constexpr bool | |
3471 | is_pointer_interconvertible_with_class(_Mem _Tp::*__mp) noexcept | |
3472 | { return __builtin_is_pointer_interconvertible_with_class(__mp); } | |
3473 | #endif | |
3474 | #endif | |
3475 | ||
b8ecdc77 JW |
3476 | #if __cplusplus > 202002L |
3477 | #define __cpp_lib_is_scoped_enum 202011L | |
3478 | ||
aba938d6 | 3479 | /// True if the type is a scoped enumeration type. |
6963c3b9 | 3480 | /// @since C++23 |
6963c3b9 | 3481 | |
b8ecdc77 JW |
3482 | template<typename _Tp> |
3483 | struct is_scoped_enum | |
3484 | : false_type | |
3485 | { }; | |
3486 | ||
43ab1dc2 JW |
3487 | template<typename _Tp> |
3488 | requires __is_enum(_Tp) | |
3489 | && requires(_Tp __t) { __t = __t; } // fails if incomplete | |
b8ecdc77 | 3490 | struct is_scoped_enum<_Tp> |
43ab1dc2 JW |
3491 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> |
3492 | { }; | |
3493 | ||
3494 | // FIXME remove this partial specialization and use remove_cv_t<_Tp> above | |
3495 | // when PR c++/99968 is fixed. | |
3496 | template<typename _Tp> | |
3497 | requires __is_enum(_Tp) | |
3498 | && requires(_Tp __t) { __t = __t; } // fails if incomplete | |
3499 | struct is_scoped_enum<const _Tp> | |
3500 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> | |
b8ecdc77 JW |
3501 | { }; |
3502 | ||
aba938d6 JW |
3503 | /// @ingroup variable_templates |
3504 | /// @since C++23 | |
b8ecdc77 JW |
3505 | template<typename _Tp> |
3506 | inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; | |
aba938d6 | 3507 | |
b8ecdc77 JW |
3508 | #endif // C++23 |
3509 | ||
74d14778 | 3510 | #if _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED |
8aa1550e | 3511 | #define __cpp_lib_is_constant_evaluated 201811L |
134a6f7b | 3512 | |
6963c3b9 | 3513 | /// Returns true only when called during constant evaluation. |
aba938d6 | 3514 | /// @since C++20 |
0d7924f2 JJ |
3515 | constexpr inline bool |
3516 | is_constant_evaluated() noexcept | |
74d14778 JW |
3517 | { |
3518 | #if __cpp_if_consteval >= 202106L | |
3519 | if consteval { return true; } else { return false; } | |
3520 | #else | |
3521 | return __builtin_is_constant_evaluated(); | |
3522 | #endif | |
3523 | } | |
0d7924f2 JJ |
3524 | #endif |
3525 | ||
6963c3b9 | 3526 | /// @cond undocumented |
0f8b14ee JW |
3527 | template<typename _From, typename _To> |
3528 | using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type; | |
3529 | ||
3530 | template<typename _Xp, typename _Yp> | |
3531 | using __cond_res | |
3532 | = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); | |
3533 | ||
3534 | template<typename _Ap, typename _Bp, typename = void> | |
3535 | struct __common_ref_impl | |
3536 | { }; | |
3537 | ||
3538 | // [meta.trans.other], COMMON-REF(A, B) | |
3539 | template<typename _Ap, typename _Bp> | |
3540 | using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type; | |
3541 | ||
c37b5ddc JW |
3542 | // COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &) |
3543 | template<typename _Xp, typename _Yp> | |
3544 | using __condres_cvref | |
3545 | = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; | |
3546 | ||
0f8b14ee JW |
3547 | // If A and B are both lvalue reference types, ... |
3548 | template<typename _Xp, typename _Yp> | |
c37b5ddc JW |
3549 | struct __common_ref_impl<_Xp&, _Yp&, __void_t<__condres_cvref<_Xp, _Yp>>> |
3550 | : enable_if<is_reference_v<__condres_cvref<_Xp, _Yp>>, | |
3551 | __condres_cvref<_Xp, _Yp>> | |
3552 | { }; | |
0f8b14ee JW |
3553 | |
3554 | // let C be remove_reference_t<COMMON-REF(X&, Y&)>&& | |
3555 | template<typename _Xp, typename _Yp> | |
3556 | using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&; | |
3557 | ||
3558 | // If A and B are both rvalue reference types, ... | |
3559 | template<typename _Xp, typename _Yp> | |
3560 | struct __common_ref_impl<_Xp&&, _Yp&&, | |
3561 | _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>, | |
3562 | is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>> | |
3563 | { using type = __common_ref_C<_Xp, _Yp>; }; | |
3564 | ||
3565 | // let D be COMMON-REF(const X&, Y&) | |
3566 | template<typename _Xp, typename _Yp> | |
3567 | using __common_ref_D = __common_ref<const _Xp&, _Yp&>; | |
3568 | ||
3569 | // If A is an rvalue reference and B is an lvalue reference, ... | |
3570 | template<typename _Xp, typename _Yp> | |
3571 | struct __common_ref_impl<_Xp&&, _Yp&, | |
3572 | _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>> | |
3573 | { using type = __common_ref_D<_Xp, _Yp>; }; | |
3574 | ||
3575 | // If A is an lvalue reference and B is an rvalue reference, ... | |
3576 | template<typename _Xp, typename _Yp> | |
3577 | struct __common_ref_impl<_Xp&, _Yp&&> | |
3578 | : __common_ref_impl<_Yp&&, _Xp&> | |
3579 | { }; | |
6963c3b9 | 3580 | /// @endcond |
0f8b14ee JW |
3581 | |
3582 | template<typename _Tp, typename _Up, | |
3583 | template<typename> class _TQual, template<typename> class _UQual> | |
3584 | struct basic_common_reference | |
3585 | { }; | |
3586 | ||
6963c3b9 | 3587 | /// @cond undocumented |
0f8b14ee JW |
3588 | template<typename _Tp> |
3589 | struct __xref | |
3590 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; }; | |
3591 | ||
3592 | template<typename _Tp> | |
3593 | struct __xref<_Tp&> | |
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 _Tp1, typename _Tp2> | |
3601 | using __basic_common_ref | |
3602 | = typename basic_common_reference<remove_cvref_t<_Tp1>, | |
3603 | remove_cvref_t<_Tp2>, | |
3604 | __xref<_Tp1>::template __type, | |
3605 | __xref<_Tp2>::template __type>::type; | |
6963c3b9 | 3606 | /// @endcond |
0f8b14ee JW |
3607 | |
3608 | template<typename... _Tp> | |
3609 | struct common_reference; | |
3610 | ||
3611 | template<typename... _Tp> | |
3612 | using common_reference_t = typename common_reference<_Tp...>::type; | |
3613 | ||
3614 | // If sizeof...(T) is zero, there shall be no member type. | |
3615 | template<> | |
3616 | struct common_reference<> | |
3617 | { }; | |
3618 | ||
3619 | // If sizeof...(T) is one ... | |
3620 | template<typename _Tp0> | |
3621 | struct common_reference<_Tp0> | |
3622 | { using type = _Tp0; }; | |
3623 | ||
6963c3b9 | 3624 | /// @cond undocumented |
0f8b14ee JW |
3625 | template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void> |
3626 | struct __common_reference_impl | |
3627 | : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1> | |
3628 | { }; | |
3629 | ||
3630 | // If sizeof...(T) is two ... | |
3631 | template<typename _Tp1, typename _Tp2> | |
3632 | struct common_reference<_Tp1, _Tp2> | |
3633 | : __common_reference_impl<_Tp1, _Tp2> | |
3634 | { }; | |
3635 | ||
3636 | // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ... | |
3637 | template<typename _Tp1, typename _Tp2> | |
3638 | struct __common_reference_impl<_Tp1&, _Tp2&, 1, | |
3639 | void_t<__common_ref<_Tp1&, _Tp2&>>> | |
3640 | { using type = __common_ref<_Tp1&, _Tp2&>; }; | |
3641 | ||
3642 | template<typename _Tp1, typename _Tp2> | |
3643 | struct __common_reference_impl<_Tp1&&, _Tp2&&, 1, | |
3644 | void_t<__common_ref<_Tp1&&, _Tp2&&>>> | |
3645 | { using type = __common_ref<_Tp1&&, _Tp2&&>; }; | |
3646 | ||
3647 | template<typename _Tp1, typename _Tp2> | |
3648 | struct __common_reference_impl<_Tp1&, _Tp2&&, 1, | |
3649 | void_t<__common_ref<_Tp1&, _Tp2&&>>> | |
3650 | { using type = __common_ref<_Tp1&, _Tp2&&>; }; | |
3651 | ||
3652 | template<typename _Tp1, typename _Tp2> | |
3653 | struct __common_reference_impl<_Tp1&&, _Tp2&, 1, | |
3654 | void_t<__common_ref<_Tp1&&, _Tp2&>>> | |
3655 | { using type = __common_ref<_Tp1&&, _Tp2&>; }; | |
3656 | ||
3657 | // Otherwise, if basic_common_reference<...>::type is well-formed, ... | |
3658 | template<typename _Tp1, typename _Tp2> | |
3659 | struct __common_reference_impl<_Tp1, _Tp2, 2, | |
3660 | void_t<__basic_common_ref<_Tp1, _Tp2>>> | |
3661 | { using type = __basic_common_ref<_Tp1, _Tp2>; }; | |
3662 | ||
3663 | // Otherwise, if COND-RES(T1, T2) is well-formed, ... | |
3664 | template<typename _Tp1, typename _Tp2> | |
3665 | struct __common_reference_impl<_Tp1, _Tp2, 3, | |
3666 | void_t<__cond_res<_Tp1, _Tp2>>> | |
3667 | { using type = __cond_res<_Tp1, _Tp2>; }; | |
3668 | ||
3669 | // Otherwise, if common_type_t<T1, T2> is well-formed, ... | |
3670 | template<typename _Tp1, typename _Tp2> | |
3671 | struct __common_reference_impl<_Tp1, _Tp2, 4, | |
3672 | void_t<common_type_t<_Tp1, _Tp2>>> | |
3673 | { using type = common_type_t<_Tp1, _Tp2>; }; | |
3674 | ||
3675 | // Otherwise, there shall be no member type. | |
3676 | template<typename _Tp1, typename _Tp2> | |
3677 | struct __common_reference_impl<_Tp1, _Tp2, 5, void> | |
3678 | { }; | |
3679 | ||
3680 | // Otherwise, if sizeof...(T) is greater than two, ... | |
3681 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3682 | struct common_reference<_Tp1, _Tp2, _Rest...> | |
3683 | : __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3684 | __common_type_pack<_Rest...>> | |
3685 | { }; | |
3686 | ||
3687 | // Reuse __common_type_fold for common_reference<T1, T2, Rest...> | |
3688 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3689 | struct __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3690 | __common_type_pack<_Rest...>, | |
3691 | void_t<common_reference_t<_Tp1, _Tp2>>> | |
3692 | : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...> | |
3693 | { }; | |
6963c3b9 | 3694 | /// @endcond |
0f8b14ee | 3695 | |
e641ee43 JW |
3696 | #endif // C++2a |
3697 | ||
6963c3b9 JW |
3698 | /// @} group metaprogramming |
3699 | ||
12ffa228 | 3700 | _GLIBCXX_END_NAMESPACE_VERSION |
c0ffa2ba | 3701 | } // namespace std |
7b50cdef | 3702 | |
734f5023 | 3703 | #endif // C++11 |
57317d2a | 3704 | |
7274deff | 3705 | #endif // _GLIBCXX_TYPE_TRAITS |