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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 | |
390f94ee PP |
103 | // Primary template. |
104 | /// Define a member typedef `type` only if a boolean constant is true. | |
105 | template<bool, typename _Tp = void> | |
106 | struct enable_if | |
107 | { }; | |
108 | ||
109 | // Partial specialization for true. | |
110 | template<typename _Tp> | |
111 | struct enable_if<true, _Tp> | |
112 | { typedef _Tp type; }; | |
113 | ||
114 | // __enable_if_t (std::enable_if_t for C++11) | |
115 | template<bool _Cond, typename _Tp = void> | |
116 | using __enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
117 | ||
a09bb4a8 JW |
118 | template<bool> |
119 | struct __conditional | |
120 | { | |
121 | template<typename _Tp, typename> | |
122 | using type = _Tp; | |
123 | }; | |
124 | ||
125 | template<> | |
126 | struct __conditional<false> | |
127 | { | |
128 | template<typename, typename _Up> | |
129 | using type = _Up; | |
130 | }; | |
131 | ||
132 | // More efficient version of std::conditional_t for internal use (and C++11) | |
133 | template<bool _Cond, typename _If, typename _Else> | |
134 | using __conditional_t | |
135 | = typename __conditional<_Cond>::template type<_If, _Else>; | |
53dc5044 | 136 | |
6963c3b9 | 137 | /// @cond undocumented |
608a080c | 138 | template <typename _Type> |
0d67cd38 JW |
139 | struct __type_identity |
140 | { using type = _Type; }; | |
141 | ||
142 | template<typename _Tp> | |
143 | using __type_identity_t = typename __type_identity<_Tp>::type; | |
608a080c | 144 | |
390f94ee PP |
145 | namespace __detail |
146 | { | |
147 | // A variadic alias template that resolves to its first argument. | |
148 | template<typename _Tp, typename...> | |
149 | using __first_t = _Tp; | |
123c516a | 150 | |
390f94ee PP |
151 | // These are deliberately not defined. |
152 | template<typename... _Bn> | |
153 | auto __or_fn(int) -> __first_t<false_type, | |
154 | __enable_if_t<!bool(_Bn::value)>...>; | |
53dc5044 | 155 | |
390f94ee PP |
156 | template<typename... _Bn> |
157 | auto __or_fn(...) -> true_type; | |
53dc5044 | 158 | |
390f94ee PP |
159 | template<typename... _Bn> |
160 | auto __and_fn(int) -> __first_t<true_type, | |
161 | __enable_if_t<bool(_Bn::value)>...>; | |
ac65b7d2 | 162 | |
390f94ee PP |
163 | template<typename... _Bn> |
164 | auto __and_fn(...) -> false_type; | |
165 | } // namespace detail | |
dd7b175e | 166 | |
390f94ee PP |
167 | // Like C++17 std::dis/conjunction, but usable in C++11 and resolves |
168 | // to either true_type or false_type which allows for a more efficient | |
169 | // implementation that avoids recursive class template instantiation. | |
170 | template<typename... _Bn> | |
51c42b38 PP |
171 | struct __or_ |
172 | : decltype(__detail::__or_fn<_Bn...>(0)) | |
173 | { }; | |
123c516a | 174 | |
390f94ee | 175 | template<typename... _Bn> |
51c42b38 PP |
176 | struct __and_ |
177 | : decltype(__detail::__and_fn<_Bn...>(0)) | |
178 | { }; | |
123c516a PC |
179 | |
180 | template<typename _Pp> | |
51c42b38 PP |
181 | struct __not_ |
182 | : __bool_constant<!bool(_Pp::value)> | |
183 | { }; | |
6963c3b9 | 184 | /// @endcond |
123c516a | 185 | |
4b9840f2 | 186 | #if __cplusplus >= 201703L |
c3a6648b | 187 | |
6963c3b9 | 188 | /// @cond undocumented |
b655b8fc JW |
189 | template<typename... _Bn> |
190 | inline constexpr bool __or_v = __or_<_Bn...>::value; | |
191 | template<typename... _Bn> | |
192 | inline constexpr bool __and_v = __and_<_Bn...>::value; | |
390f94ee PP |
193 | |
194 | namespace __detail | |
195 | { | |
196 | template<typename /* = void */, typename _B1, typename... _Bn> | |
197 | struct __disjunction_impl | |
198 | { using type = _B1; }; | |
199 | ||
200 | template<typename _B1, typename _B2, typename... _Bn> | |
201 | struct __disjunction_impl<__enable_if_t<!bool(_B1::value)>, _B1, _B2, _Bn...> | |
202 | { using type = typename __disjunction_impl<void, _B2, _Bn...>::type; }; | |
203 | ||
204 | template<typename /* = void */, typename _B1, typename... _Bn> | |
205 | struct __conjunction_impl | |
206 | { using type = _B1; }; | |
207 | ||
208 | template<typename _B1, typename _B2, typename... _Bn> | |
209 | struct __conjunction_impl<__enable_if_t<bool(_B1::value)>, _B1, _B2, _Bn...> | |
210 | { using type = typename __conjunction_impl<void, _B2, _Bn...>::type; }; | |
211 | } // namespace __detail | |
6963c3b9 | 212 | /// @endcond |
b655b8fc | 213 | |
b8806796 | 214 | #define __cpp_lib_logical_traits 201510L |
c3a6648b VV |
215 | |
216 | template<typename... _Bn> | |
217 | struct conjunction | |
390f94ee PP |
218 | : __detail::__conjunction_impl<void, _Bn...>::type |
219 | { }; | |
220 | ||
221 | template<> | |
222 | struct conjunction<> | |
223 | : true_type | |
c3a6648b VV |
224 | { }; |
225 | ||
226 | template<typename... _Bn> | |
227 | struct disjunction | |
390f94ee PP |
228 | : __detail::__disjunction_impl<void, _Bn...>::type |
229 | { }; | |
230 | ||
231 | template<> | |
232 | struct disjunction<> | |
233 | : false_type | |
c3a6648b VV |
234 | { }; |
235 | ||
236 | template<typename _Pp> | |
237 | struct negation | |
68c23af0 | 238 | : __not_<_Pp>::type |
c3a6648b | 239 | { }; |
137422c8 | 240 | |
6963c3b9 JW |
241 | /** @ingroup variable_templates |
242 | * @{ | |
243 | */ | |
137422c8 | 244 | template<typename... _Bn> |
4b9840f2 | 245 | inline constexpr bool conjunction_v = conjunction<_Bn...>::value; |
42183d03 | 246 | |
137422c8 | 247 | template<typename... _Bn> |
4b9840f2 | 248 | inline constexpr bool disjunction_v = disjunction<_Bn...>::value; |
42183d03 | 249 | |
137422c8 | 250 | template<typename _Pp> |
4b9840f2 | 251 | inline constexpr bool negation_v = negation<_Pp>::value; |
6963c3b9 | 252 | /// @} |
137422c8 | 253 | |
4b9840f2 | 254 | #endif // C++17 |
c3a6648b | 255 | |
608a080c AP |
256 | // Forward declarations |
257 | template<typename> | |
258 | struct is_reference; | |
259 | template<typename> | |
260 | struct is_function; | |
261 | template<typename> | |
262 | struct is_void; | |
6963c3b9 JW |
263 | template<typename> |
264 | struct remove_cv; | |
265 | template<typename> | |
266 | struct is_const; | |
267 | ||
268 | /// @cond undocumented | |
608a080c AP |
269 | template<typename> |
270 | struct __is_array_unknown_bounds; | |
271 | ||
272 | // Helper functions that return false_type for incomplete classes, | |
273 | // incomplete unions and arrays of known bound from those. | |
274 | ||
070b4df8 JW |
275 | template <typename _Tp, size_t = sizeof(_Tp)> |
276 | constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>) | |
608a080c AP |
277 | { return {}; } |
278 | ||
279 | template <typename _TypeIdentity, | |
280 | typename _NestedType = typename _TypeIdentity::type> | |
281 | constexpr typename __or_< | |
282 | is_reference<_NestedType>, | |
283 | is_function<_NestedType>, | |
284 | is_void<_NestedType>, | |
285 | __is_array_unknown_bounds<_NestedType> | |
286 | >::type __is_complete_or_unbounded(_TypeIdentity) | |
287 | { return {}; } | |
288 | ||
391d5d2e JW |
289 | // __remove_cv_t (std::remove_cv_t for C++11). |
290 | template<typename _Tp> | |
291 | using __remove_cv_t = typename remove_cv<_Tp>::type; | |
66af6e99 | 292 | /// @endcond |
391d5d2e | 293 | |
72459cfd JW |
294 | // Primary type categories. |
295 | ||
66af6e99 PP |
296 | /// is_void |
297 | template<typename _Tp> | |
298 | struct is_void | |
53dc5044 | 299 | : public false_type { }; |
53dc5044 | 300 | |
123c516a | 301 | template<> |
66af6e99 | 302 | struct is_void<void> |
123c516a | 303 | : public true_type { }; |
53dc5044 | 304 | |
66af6e99 PP |
305 | template<> |
306 | struct is_void<const void> | |
307 | : public true_type { }; | |
308 | ||
309 | template<> | |
310 | struct is_void<volatile void> | |
311 | : public true_type { }; | |
312 | ||
313 | template<> | |
314 | struct is_void<const volatile void> | |
315 | : public true_type { }; | |
53dc5044 | 316 | |
6963c3b9 | 317 | /// @cond undocumented |
53dc5044 PC |
318 | template<typename> |
319 | struct __is_integral_helper | |
320 | : public false_type { }; | |
123c516a PC |
321 | |
322 | template<> | |
323 | struct __is_integral_helper<bool> | |
324 | : public true_type { }; | |
33ac58d5 | 325 | |
123c516a PC |
326 | template<> |
327 | struct __is_integral_helper<char> | |
328 | : public true_type { }; | |
329 | ||
330 | template<> | |
331 | struct __is_integral_helper<signed char> | |
332 | : public true_type { }; | |
333 | ||
334 | template<> | |
335 | struct __is_integral_helper<unsigned char> | |
336 | : public true_type { }; | |
337 | ||
29e41848 JW |
338 | // We want is_integral<wchar_t> to be true (and make_signed/unsigned to work) |
339 | // even when libc doesn't provide working <wchar.h> and related functions, | |
4bdb9d61 | 340 | // so don't check _GLIBCXX_USE_WCHAR_T here. |
123c516a PC |
341 | template<> |
342 | struct __is_integral_helper<wchar_t> | |
343 | : public true_type { }; | |
123c516a | 344 | |
c124af93 TH |
345 | #ifdef _GLIBCXX_USE_CHAR8_T |
346 | template<> | |
347 | struct __is_integral_helper<char8_t> | |
348 | : public true_type { }; | |
349 | #endif | |
350 | ||
123c516a PC |
351 | template<> |
352 | struct __is_integral_helper<char16_t> | |
353 | : public true_type { }; | |
354 | ||
355 | template<> | |
356 | struct __is_integral_helper<char32_t> | |
357 | : public true_type { }; | |
358 | ||
359 | template<> | |
360 | struct __is_integral_helper<short> | |
361 | : public true_type { }; | |
362 | ||
363 | template<> | |
364 | struct __is_integral_helper<unsigned short> | |
365 | : public true_type { }; | |
366 | ||
367 | template<> | |
368 | struct __is_integral_helper<int> | |
369 | : public true_type { }; | |
370 | ||
371 | template<> | |
372 | struct __is_integral_helper<unsigned int> | |
373 | : public true_type { }; | |
374 | ||
375 | template<> | |
376 | struct __is_integral_helper<long> | |
377 | : public true_type { }; | |
378 | ||
379 | template<> | |
380 | struct __is_integral_helper<unsigned long> | |
381 | : public true_type { }; | |
382 | ||
383 | template<> | |
384 | struct __is_integral_helper<long long> | |
385 | : public true_type { }; | |
386 | ||
387 | template<> | |
388 | struct __is_integral_helper<unsigned long long> | |
389 | : public true_type { }; | |
53dc5044 | 390 | |
78a7c317 DD |
391 | // Conditionalizing on __STRICT_ANSI__ here will break any port that |
392 | // uses one of these types for size_t. | |
393 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
42167831 | 394 | __extension__ |
6d585f01 | 395 | template<> |
78a7c317 | 396 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> |
6d585f01 PC |
397 | : public true_type { }; |
398 | ||
42167831 | 399 | __extension__ |
6d585f01 | 400 | template<> |
78a7c317 DD |
401 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> |
402 | : public true_type { }; | |
403 | #endif | |
404 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 405 | __extension__ |
78a7c317 DD |
406 | template<> |
407 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> | |
408 | : public true_type { }; | |
409 | ||
42167831 | 410 | __extension__ |
78a7c317 DD |
411 | template<> |
412 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> | |
413 | : public true_type { }; | |
414 | #endif | |
415 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 416 | __extension__ |
78a7c317 DD |
417 | template<> |
418 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> | |
419 | : public true_type { }; | |
420 | ||
42167831 | 421 | __extension__ |
78a7c317 DD |
422 | template<> |
423 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> | |
424 | : public true_type { }; | |
425 | #endif | |
426 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 427 | __extension__ |
78a7c317 DD |
428 | template<> |
429 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> | |
430 | : public true_type { }; | |
431 | ||
42167831 | 432 | __extension__ |
78a7c317 DD |
433 | template<> |
434 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> | |
6d585f01 PC |
435 | : public true_type { }; |
436 | #endif | |
6963c3b9 | 437 | /// @endcond |
6d585f01 | 438 | |
53dc5044 PC |
439 | /// is_integral |
440 | template<typename _Tp> | |
441 | struct is_integral | |
391d5d2e | 442 | : public __is_integral_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
443 | { }; |
444 | ||
6963c3b9 | 445 | /// @cond undocumented |
53dc5044 PC |
446 | template<typename> |
447 | struct __is_floating_point_helper | |
448 | : public false_type { }; | |
123c516a PC |
449 | |
450 | template<> | |
451 | struct __is_floating_point_helper<float> | |
452 | : public true_type { }; | |
453 | ||
454 | template<> | |
455 | struct __is_floating_point_helper<double> | |
456 | : public true_type { }; | |
457 | ||
458 | template<> | |
459 | struct __is_floating_point_helper<long double> | |
460 | : public true_type { }; | |
53dc5044 | 461 | |
6d585f01 PC |
462 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
463 | template<> | |
464 | struct __is_floating_point_helper<__float128> | |
465 | : public true_type { }; | |
466 | #endif | |
6963c3b9 | 467 | /// @endcond |
6d585f01 | 468 | |
53dc5044 PC |
469 | /// is_floating_point |
470 | template<typename _Tp> | |
471 | struct is_floating_point | |
391d5d2e | 472 | : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
473 | { }; |
474 | ||
475 | /// is_array | |
476 | template<typename> | |
477 | struct is_array | |
478 | : public false_type { }; | |
479 | ||
480 | template<typename _Tp, std::size_t _Size> | |
481 | struct is_array<_Tp[_Size]> | |
482 | : public true_type { }; | |
483 | ||
484 | template<typename _Tp> | |
485 | struct is_array<_Tp[]> | |
486 | : public true_type { }; | |
487 | ||
488 | template<typename> | |
489 | struct __is_pointer_helper | |
490 | : public false_type { }; | |
123c516a PC |
491 | |
492 | template<typename _Tp> | |
493 | struct __is_pointer_helper<_Tp*> | |
494 | : public true_type { }; | |
53dc5044 PC |
495 | |
496 | /// is_pointer | |
497 | template<typename _Tp> | |
498 | struct is_pointer | |
391d5d2e | 499 | : public __is_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
500 | { }; |
501 | ||
123c516a PC |
502 | /// is_lvalue_reference |
503 | template<typename> | |
504 | struct is_lvalue_reference | |
505 | : public false_type { }; | |
506 | ||
53dc5044 | 507 | template<typename _Tp> |
123c516a PC |
508 | struct is_lvalue_reference<_Tp&> |
509 | : public true_type { }; | |
510 | ||
511 | /// is_rvalue_reference | |
512 | template<typename> | |
513 | struct is_rvalue_reference | |
514 | : public false_type { }; | |
53dc5044 | 515 | |
53dc5044 | 516 | template<typename _Tp> |
123c516a PC |
517 | struct is_rvalue_reference<_Tp&&> |
518 | : public true_type { }; | |
519 | ||
53dc5044 PC |
520 | template<typename> |
521 | struct __is_member_object_pointer_helper | |
522 | : public false_type { }; | |
123c516a PC |
523 | |
524 | template<typename _Tp, typename _Cp> | |
525 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 526 | : public __not_<is_function<_Tp>>::type { }; |
53dc5044 PC |
527 | |
528 | /// is_member_object_pointer | |
529 | template<typename _Tp> | |
530 | struct is_member_object_pointer | |
391d5d2e | 531 | : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
532 | { }; |
533 | ||
534 | template<typename> | |
535 | struct __is_member_function_pointer_helper | |
536 | : public false_type { }; | |
123c516a PC |
537 | |
538 | template<typename _Tp, typename _Cp> | |
539 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 540 | : public is_function<_Tp>::type { }; |
53dc5044 PC |
541 | |
542 | /// is_member_function_pointer | |
543 | template<typename _Tp> | |
544 | struct is_member_function_pointer | |
391d5d2e | 545 | : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
546 | { }; |
547 | ||
548 | /// is_enum | |
549 | template<typename _Tp> | |
550 | struct is_enum | |
551 | : public integral_constant<bool, __is_enum(_Tp)> | |
552 | { }; | |
553 | ||
554 | /// is_union | |
555 | template<typename _Tp> | |
556 | struct is_union | |
557 | : public integral_constant<bool, __is_union(_Tp)> | |
558 | { }; | |
559 | ||
560 | /// is_class | |
561 | template<typename _Tp> | |
562 | struct is_class | |
563 | : public integral_constant<bool, __is_class(_Tp)> | |
564 | { }; | |
565 | ||
566 | /// is_function | |
72459cfd | 567 | template<typename _Tp> |
53dc5044 | 568 | struct is_function |
72459cfd | 569 | : public __bool_constant<!is_const<const _Tp>::value> { }; |
89898034 | 570 | |
72459cfd JW |
571 | template<typename _Tp> |
572 | struct is_function<_Tp&> | |
573 | : public false_type { }; | |
89898034 | 574 | |
72459cfd JW |
575 | template<typename _Tp> |
576 | struct is_function<_Tp&&> | |
577 | : public false_type { }; | |
89898034 | 578 | |
b8806796 | 579 | #define __cpp_lib_is_null_pointer 201309L |
a15f7cb8 | 580 | |
66af6e99 PP |
581 | /// is_null_pointer (LWG 2247). |
582 | template<typename _Tp> | |
583 | struct is_null_pointer | |
1e673415 | 584 | : public false_type { }; |
123c516a PC |
585 | |
586 | template<> | |
66af6e99 | 587 | struct is_null_pointer<std::nullptr_t> |
123c516a | 588 | : public true_type { }; |
1e673415 | 589 | |
66af6e99 PP |
590 | template<> |
591 | struct is_null_pointer<const std::nullptr_t> | |
592 | : public true_type { }; | |
593 | ||
594 | template<> | |
595 | struct is_null_pointer<volatile std::nullptr_t> | |
596 | : public true_type { }; | |
597 | ||
598 | template<> | |
599 | struct is_null_pointer<const volatile std::nullptr_t> | |
600 | : public true_type { }; | |
aa940ab5 | 601 | |
07fd852f | 602 | /// __is_nullptr_t (deprecated extension). |
aba938d6 | 603 | /// @deprecated Non-standard. Use `is_null_pointer` instead. |
1e673415 PC |
604 | template<typename _Tp> |
605 | struct __is_nullptr_t | |
aa940ab5 | 606 | : public is_null_pointer<_Tp> |
eef9bf4c | 607 | { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer"); |
1e673415 | 608 | |
c0ffa2ba | 609 | // Composite type categories. |
123c516a PC |
610 | |
611 | /// is_reference | |
612 | template<typename _Tp> | |
613 | struct is_reference | |
cdcc27c1 PP |
614 | : public false_type |
615 | { }; | |
616 | ||
617 | template<typename _Tp> | |
618 | struct is_reference<_Tp&> | |
619 | : public true_type | |
620 | { }; | |
621 | ||
622 | template<typename _Tp> | |
623 | struct is_reference<_Tp&&> | |
624 | : public true_type | |
123c516a PC |
625 | { }; |
626 | ||
53dc5044 PC |
627 | /// is_arithmetic |
628 | template<typename _Tp> | |
629 | struct is_arithmetic | |
123c516a | 630 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
631 | { }; |
632 | ||
633 | /// is_fundamental | |
634 | template<typename _Tp> | |
635 | struct is_fundamental | |
aa940ab5 PC |
636 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, |
637 | is_null_pointer<_Tp>>::type | |
53dc5044 PC |
638 | { }; |
639 | ||
640 | /// is_object | |
641 | template<typename _Tp> | |
642 | struct is_object | |
123c516a PC |
643 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
644 | is_void<_Tp>>>::type | |
53dc5044 PC |
645 | { }; |
646 | ||
123c516a | 647 | template<typename> |
53dc5044 PC |
648 | struct is_member_pointer; |
649 | ||
650 | /// is_scalar | |
651 | template<typename _Tp> | |
652 | struct is_scalar | |
123c516a | 653 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
aa940ab5 | 654 | is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type |
53dc5044 PC |
655 | { }; |
656 | ||
657 | /// is_compound | |
658 | template<typename _Tp> | |
659 | struct is_compound | |
c01f9216 | 660 | : public __not_<is_fundamental<_Tp>>::type { }; |
53dc5044 | 661 | |
6963c3b9 | 662 | /// @cond undocumented |
53dc5044 PC |
663 | template<typename _Tp> |
664 | struct __is_member_pointer_helper | |
665 | : public false_type { }; | |
123c516a PC |
666 | |
667 | template<typename _Tp, typename _Cp> | |
668 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
669 | : public true_type { }; | |
6963c3b9 | 670 | /// @endcond |
53dc5044 | 671 | |
13901e4b | 672 | /// is_member_pointer |
53dc5044 | 673 | template<typename _Tp> |
123c516a | 674 | struct is_member_pointer |
391d5d2e | 675 | : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
676 | { }; |
677 | ||
47f79054 JW |
678 | template<typename, typename> |
679 | struct is_same; | |
680 | ||
6963c3b9 | 681 | /// @cond undocumented |
47f79054 JW |
682 | template<typename _Tp, typename... _Types> |
683 | using __is_one_of = __or_<is_same<_Tp, _Types>...>; | |
684 | ||
685 | // Check if a type is one of the signed integer types. | |
42167831 | 686 | __extension__ |
47f79054 | 687 | template<typename _Tp> |
391d5d2e | 688 | using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
689 | signed char, signed short, signed int, signed long, |
690 | signed long long | |
691 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
692 | , signed __GLIBCXX_TYPE_INT_N_0 | |
693 | #endif | |
694 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
695 | , signed __GLIBCXX_TYPE_INT_N_1 | |
696 | #endif | |
697 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
698 | , signed __GLIBCXX_TYPE_INT_N_2 | |
699 | #endif | |
700 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
701 | , signed __GLIBCXX_TYPE_INT_N_3 | |
702 | #endif | |
703 | >; | |
704 | ||
705 | // Check if a type is one of the unsigned integer types. | |
42167831 | 706 | __extension__ |
47f79054 | 707 | template<typename _Tp> |
391d5d2e | 708 | using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
709 | unsigned char, unsigned short, unsigned int, unsigned long, |
710 | unsigned long long | |
711 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
712 | , unsigned __GLIBCXX_TYPE_INT_N_0 | |
713 | #endif | |
714 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
715 | , unsigned __GLIBCXX_TYPE_INT_N_1 | |
716 | #endif | |
717 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
718 | , unsigned __GLIBCXX_TYPE_INT_N_2 | |
719 | #endif | |
720 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
721 | , unsigned __GLIBCXX_TYPE_INT_N_3 | |
722 | #endif | |
723 | >; | |
724 | ||
98cf2c26 JW |
725 | // Check if a type is one of the signed or unsigned integer types. |
726 | template<typename _Tp> | |
727 | using __is_standard_integer | |
728 | = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>; | |
47f79054 | 729 | |
72459cfd JW |
730 | // __void_t (std::void_t for C++11) |
731 | template<typename...> using __void_t = void; | |
6963c3b9 | 732 | /// @endcond |
89898034 | 733 | |
c0ffa2ba | 734 | // Type properties. |
123c516a | 735 | |
53dc5044 PC |
736 | /// is_const |
737 | template<typename> | |
738 | struct is_const | |
739 | : public false_type { }; | |
740 | ||
741 | template<typename _Tp> | |
742 | struct is_const<_Tp const> | |
743 | : public true_type { }; | |
33ac58d5 | 744 | |
53dc5044 PC |
745 | /// is_volatile |
746 | template<typename> | |
747 | struct is_volatile | |
748 | : public false_type { }; | |
749 | ||
750 | template<typename _Tp> | |
751 | struct is_volatile<_Tp volatile> | |
752 | : public true_type { }; | |
753 | ||
123c516a PC |
754 | /// is_trivial |
755 | template<typename _Tp> | |
756 | struct is_trivial | |
757 | : public integral_constant<bool, __is_trivial(_Tp)> | |
608a080c AP |
758 | { |
759 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
760 | "template argument must be a complete class or an unbounded array"); | |
761 | }; | |
123c516a | 762 | |
6963c3b9 | 763 | /// is_trivially_copyable |
f5e523b7 VV |
764 | template<typename _Tp> |
765 | struct is_trivially_copyable | |
766 | : public integral_constant<bool, __is_trivially_copyable(_Tp)> | |
608a080c AP |
767 | { |
768 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
769 | "template argument must be a complete class or an unbounded array"); | |
770 | }; | |
123c516a PC |
771 | |
772 | /// is_standard_layout | |
773 | template<typename _Tp> | |
774 | struct is_standard_layout | |
775 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
608a080c AP |
776 | { |
777 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
778 | "template argument must be a complete class or an unbounded array"); | |
779 | }; | |
123c516a | 780 | |
aba938d6 JW |
781 | /** is_pod |
782 | * @deprecated Deprecated in C++20. | |
783 | * Use `is_standard_layout && is_trivial` instead. | |
6963c3b9 | 784 | */ |
123c516a PC |
785 | // Could use is_standard_layout && is_trivial instead of the builtin. |
786 | template<typename _Tp> | |
1a6c5064 JTM |
787 | struct |
788 | _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead") | |
789 | is_pod | |
123c516a | 790 | : public integral_constant<bool, __is_pod(_Tp)> |
608a080c AP |
791 | { |
792 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
793 | "template argument must be a complete class or an unbounded array"); | |
794 | }; | |
123c516a | 795 | |
6963c3b9 | 796 | /** is_literal_type |
aba938d6 JW |
797 | * @deprecated Deprecated in C++17, removed in C++20. |
798 | * The idea of a literal type isn't useful. | |
6963c3b9 | 799 | */ |
123c516a | 800 | template<typename _Tp> |
24b54628 VV |
801 | struct |
802 | _GLIBCXX17_DEPRECATED | |
803 | is_literal_type | |
123c516a | 804 | : public integral_constant<bool, __is_literal_type(_Tp)> |
608a080c AP |
805 | { |
806 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
807 | "template argument must be a complete class or an unbounded array"); | |
808 | }; | |
123c516a | 809 | |
53dc5044 PC |
810 | /// is_empty |
811 | template<typename _Tp> | |
812 | struct is_empty | |
813 | : public integral_constant<bool, __is_empty(_Tp)> | |
209ee624 | 814 | { }; |
53dc5044 PC |
815 | |
816 | /// is_polymorphic | |
817 | template<typename _Tp> | |
818 | struct is_polymorphic | |
819 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
209ee624 | 820 | { }; |
53dc5044 | 821 | |
4db7fcb9 ESR |
822 | #if __cplusplus >= 201402L |
823 | #define __cpp_lib_is_final 201402L | |
824 | /// is_final | |
6963c3b9 | 825 | /// @since C++14 |
4db7fcb9 ESR |
826 | template<typename _Tp> |
827 | struct is_final | |
828 | : public integral_constant<bool, __is_final(_Tp)> | |
209ee624 | 829 | { }; |
4db7fcb9 ESR |
830 | #endif |
831 | ||
53dc5044 PC |
832 | /// is_abstract |
833 | template<typename _Tp> | |
834 | struct is_abstract | |
835 | : public integral_constant<bool, __is_abstract(_Tp)> | |
209ee624 | 836 | { }; |
53dc5044 | 837 | |
6963c3b9 | 838 | /// @cond undocumented |
123c516a | 839 | template<typename _Tp, |
6a4b1a00 | 840 | bool = is_arithmetic<_Tp>::value> |
123c516a PC |
841 | struct __is_signed_helper |
842 | : public false_type { }; | |
843 | ||
53dc5044 | 844 | template<typename _Tp> |
6a4b1a00 PC |
845 | struct __is_signed_helper<_Tp, true> |
846 | : public integral_constant<bool, _Tp(-1) < _Tp(0)> | |
53dc5044 | 847 | { }; |
6963c3b9 | 848 | /// @endcond |
53dc5044 | 849 | |
123c516a | 850 | /// is_signed |
53dc5044 | 851 | template<typename _Tp> |
123c516a | 852 | struct is_signed |
82b12c4b | 853 | : public __is_signed_helper<_Tp>::type |
123c516a PC |
854 | { }; |
855 | ||
856 | /// is_unsigned | |
857 | template<typename _Tp> | |
858 | struct is_unsigned | |
68c23af0 | 859 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type |
123c516a PC |
860 | { }; |
861 | ||
6963c3b9 | 862 | /// @cond undocumented |
ec26ff5a JW |
863 | template<typename _Tp, typename _Up = _Tp&&> |
864 | _Up | |
865 | __declval(int); | |
866 | ||
867 | template<typename _Tp> | |
868 | _Tp | |
869 | __declval(long); | |
6963c3b9 | 870 | /// @endcond |
ec26ff5a | 871 | |
53dc5044 | 872 | template<typename _Tp> |
ec26ff5a | 873 | auto declval() noexcept -> decltype(__declval<_Tp>(0)); |
53dc5044 | 874 | |
123c516a PC |
875 | template<typename> |
876 | struct remove_all_extents; | |
877 | ||
6963c3b9 | 878 | /// @cond undocumented |
123c516a PC |
879 | template<typename _Tp> |
880 | struct __is_array_known_bounds | |
0e1b1222 JW |
881 | : public false_type |
882 | { }; | |
883 | ||
884 | template<typename _Tp, size_t _Size> | |
885 | struct __is_array_known_bounds<_Tp[_Size]> | |
886 | : public true_type | |
53dc5044 PC |
887 | { }; |
888 | ||
123c516a PC |
889 | template<typename _Tp> |
890 | struct __is_array_unknown_bounds | |
0e1b1222 JW |
891 | : public false_type |
892 | { }; | |
893 | ||
894 | template<typename _Tp> | |
895 | struct __is_array_unknown_bounds<_Tp[]> | |
896 | : public true_type | |
53dc5044 | 897 | { }; |
33ac58d5 | 898 | |
6963c3b9 JW |
899 | // Destructible and constructible type properties. |
900 | ||
62fa805f | 901 | // In N3290 is_destructible does not say anything about function |
2c7a09d7 | 902 | // types and abstract types, see LWG 2049. This implementation |
62fa805f DK |
903 | // describes function types as non-destructible and all complete |
904 | // object types as destructible, iff the explicit destructor | |
2c7a09d7 | 905 | // call expression is wellformed. |
62fa805f | 906 | struct __do_is_destructible_impl |
123c516a | 907 | { |
62fa805f | 908 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
123c516a PC |
909 | static true_type __test(int); |
910 | ||
911 | template<typename> | |
912 | static false_type __test(...); | |
913 | }; | |
53dc5044 PC |
914 | |
915 | template<typename _Tp> | |
62fa805f DK |
916 | struct __is_destructible_impl |
917 | : public __do_is_destructible_impl | |
123c516a PC |
918 | { |
919 | typedef decltype(__test<_Tp>(0)) type; | |
920 | }; | |
53dc5044 | 921 | |
62fa805f DK |
922 | template<typename _Tp, |
923 | bool = __or_<is_void<_Tp>, | |
924 | __is_array_unknown_bounds<_Tp>, | |
925 | is_function<_Tp>>::value, | |
926 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
927 | struct __is_destructible_safe; | |
928 | ||
929 | template<typename _Tp> | |
930 | struct __is_destructible_safe<_Tp, false, false> | |
931 | : public __is_destructible_impl<typename | |
932 | remove_all_extents<_Tp>::type>::type | |
933 | { }; | |
934 | ||
935 | template<typename _Tp> | |
936 | struct __is_destructible_safe<_Tp, true, false> | |
937 | : public false_type { }; | |
938 | ||
939 | template<typename _Tp> | |
940 | struct __is_destructible_safe<_Tp, false, true> | |
941 | : public true_type { }; | |
6963c3b9 | 942 | /// @endcond |
62fa805f DK |
943 | |
944 | /// is_destructible | |
945 | template<typename _Tp> | |
946 | struct is_destructible | |
82b12c4b | 947 | : public __is_destructible_safe<_Tp>::type |
608a080c AP |
948 | { |
949 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
950 | "template argument must be a complete class or an unbounded array"); | |
951 | }; | |
62fa805f | 952 | |
6963c3b9 JW |
953 | /// @cond undocumented |
954 | ||
62fa805f DK |
955 | // is_nothrow_destructible requires that is_destructible is |
956 | // satisfied as well. We realize that by mimicing the | |
957 | // implementation of is_destructible but refer to noexcept(expr) | |
958 | // instead of decltype(expr). | |
959 | struct __do_is_nt_destructible_impl | |
123c516a | 960 | { |
62fa805f | 961 | template<typename _Tp> |
c01f9216 JW |
962 | static __bool_constant<noexcept(declval<_Tp&>().~_Tp())> |
963 | __test(int); | |
123c516a PC |
964 | |
965 | template<typename> | |
966 | static false_type __test(...); | |
967 | }; | |
53dc5044 | 968 | |
53dc5044 | 969 | template<typename _Tp> |
62fa805f DK |
970 | struct __is_nt_destructible_impl |
971 | : public __do_is_nt_destructible_impl | |
123c516a PC |
972 | { |
973 | typedef decltype(__test<_Tp>(0)) type; | |
974 | }; | |
975 | ||
976 | template<typename _Tp, | |
977 | bool = __or_<is_void<_Tp>, | |
62fa805f DK |
978 | __is_array_unknown_bounds<_Tp>, |
979 | is_function<_Tp>>::value, | |
980 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
981 | struct __is_nt_destructible_safe; | |
53dc5044 PC |
982 | |
983 | template<typename _Tp> | |
62fa805f DK |
984 | struct __is_nt_destructible_safe<_Tp, false, false> |
985 | : public __is_nt_destructible_impl<typename | |
986 | remove_all_extents<_Tp>::type>::type | |
123c516a PC |
987 | { }; |
988 | ||
53dc5044 | 989 | template<typename _Tp> |
62fa805f | 990 | struct __is_nt_destructible_safe<_Tp, true, false> |
123c516a | 991 | : public false_type { }; |
53dc5044 PC |
992 | |
993 | template<typename _Tp> | |
62fa805f | 994 | struct __is_nt_destructible_safe<_Tp, false, true> |
123c516a | 995 | : public true_type { }; |
6963c3b9 | 996 | /// @endcond |
123c516a | 997 | |
62fa805f | 998 | /// is_nothrow_destructible |
53dc5044 | 999 | template<typename _Tp> |
62fa805f | 1000 | struct is_nothrow_destructible |
82b12c4b | 1001 | : public __is_nt_destructible_safe<_Tp>::type |
608a080c AP |
1002 | { |
1003 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1004 | "template argument must be a complete class or an unbounded array"); | |
1005 | }; | |
1006 | ||
6963c3b9 | 1007 | /// @cond undocumented |
608a080c | 1008 | template<typename _Tp, typename... _Args> |
9bcedbbf JW |
1009 | using __is_constructible_impl |
1010 | = __bool_constant<__is_constructible(_Tp, _Args...)>; | |
6963c3b9 | 1011 | /// @endcond |
123c516a | 1012 | |
58487c21 JW |
1013 | /// is_constructible |
1014 | template<typename _Tp, typename... _Args> | |
1015 | struct is_constructible | |
608a080c AP |
1016 | : public __is_constructible_impl<_Tp, _Args...> |
1017 | { | |
1018 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1019 | "template argument must be a complete class or an unbounded array"); | |
1020 | }; | |
4a27a739 | 1021 | |
123c516a | 1022 | /// is_default_constructible |
4a27a739 | 1023 | template<typename _Tp> |
123c516a | 1024 | struct is_default_constructible |
9bcedbbf | 1025 | : public __is_constructible_impl<_Tp> |
608a080c AP |
1026 | { |
1027 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1028 | "template argument must be a complete class or an unbounded array"); | |
1029 | }; | |
c32097d8 | 1030 | |
6963c3b9 | 1031 | /// @cond undocumented |
56bb34e3 | 1032 | template<typename _Tp, typename = void> |
9bcedbbf JW |
1033 | struct __add_lvalue_reference_helper |
1034 | { using type = _Tp; }; | |
123c516a | 1035 | |
65cee9bd | 1036 | template<typename _Tp> |
56bb34e3 | 1037 | struct __add_lvalue_reference_helper<_Tp, __void_t<_Tp&>> |
9bcedbbf | 1038 | { using type = _Tp&; }; |
65cee9bd PC |
1039 | |
1040 | template<typename _Tp> | |
9bcedbbf | 1041 | using __add_lval_ref_t = typename __add_lvalue_reference_helper<_Tp>::type; |
6963c3b9 | 1042 | /// @endcond |
65cee9bd PC |
1043 | |
1044 | /// is_copy_constructible | |
1045 | template<typename _Tp> | |
1046 | struct is_copy_constructible | |
9bcedbbf | 1047 | : public __is_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
608a080c AP |
1048 | { |
1049 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1050 | "template argument must be a complete class or an unbounded array"); | |
1051 | }; | |
65cee9bd | 1052 | |
6963c3b9 | 1053 | /// @cond undocumented |
56bb34e3 | 1054 | template<typename _Tp, typename = void> |
9bcedbbf JW |
1055 | struct __add_rvalue_reference_helper |
1056 | { using type = _Tp; }; | |
65cee9bd PC |
1057 | |
1058 | template<typename _Tp> | |
56bb34e3 | 1059 | struct __add_rvalue_reference_helper<_Tp, __void_t<_Tp&&>> |
9bcedbbf | 1060 | { using type = _Tp&&; }; |
65cee9bd PC |
1061 | |
1062 | template<typename _Tp> | |
9bcedbbf | 1063 | using __add_rval_ref_t = typename __add_rvalue_reference_helper<_Tp>::type; |
6963c3b9 | 1064 | /// @endcond |
65cee9bd PC |
1065 | |
1066 | /// is_move_constructible | |
1067 | template<typename _Tp> | |
1068 | struct is_move_constructible | |
9bcedbbf | 1069 | : public __is_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
608a080c AP |
1070 | { |
1071 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1072 | "template argument must be a complete class or an unbounded array"); | |
1073 | }; | |
65cee9bd | 1074 | |
6963c3b9 | 1075 | /// @cond undocumented |
b3341826 JW |
1076 | template<typename _Tp, typename... _Args> |
1077 | using __is_nothrow_constructible_impl | |
9e2256dc | 1078 | = __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>; |
6963c3b9 | 1079 | /// @endcond |
b3341826 | 1080 | |
608a080c AP |
1081 | /// is_nothrow_constructible |
1082 | template<typename _Tp, typename... _Args> | |
1083 | struct is_nothrow_constructible | |
9bcedbbf | 1084 | : public __is_nothrow_constructible_impl<_Tp, _Args...> |
608a080c AP |
1085 | { |
1086 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1087 | "template argument must be a complete class or an unbounded array"); | |
1088 | }; | |
1089 | ||
b3341826 JW |
1090 | /// is_nothrow_default_constructible |
1091 | template<typename _Tp> | |
1092 | struct is_nothrow_default_constructible | |
9bcedbbf | 1093 | : public __is_nothrow_constructible_impl<_Tp> |
b3341826 JW |
1094 | { |
1095 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1096 | "template argument must be a complete class or an unbounded array"); | |
1097 | }; | |
1098 | ||
65cee9bd PC |
1099 | /// is_nothrow_copy_constructible |
1100 | template<typename _Tp> | |
1101 | struct is_nothrow_copy_constructible | |
9bcedbbf | 1102 | : public __is_nothrow_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
608a080c AP |
1103 | { |
1104 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1105 | "template argument must be a complete class or an unbounded array"); | |
1106 | }; | |
65cee9bd | 1107 | |
65cee9bd PC |
1108 | /// is_nothrow_move_constructible |
1109 | template<typename _Tp> | |
1110 | struct is_nothrow_move_constructible | |
9bcedbbf | 1111 | : public __is_nothrow_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
608a080c AP |
1112 | { |
1113 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1114 | "template argument must be a complete class or an unbounded array"); | |
1115 | }; | |
65cee9bd | 1116 | |
9bcedbbf JW |
1117 | /// @cond undocumented |
1118 | template<typename _Tp, typename _Up> | |
1119 | using __is_assignable_impl = __bool_constant<__is_assignable(_Tp, _Up)>; | |
1120 | /// @endcond | |
1121 | ||
f263981a PC |
1122 | /// is_assignable |
1123 | template<typename _Tp, typename _Up> | |
1124 | struct is_assignable | |
9bcedbbf | 1125 | : public __is_assignable_impl<_Tp, _Up> |
608a080c AP |
1126 | { |
1127 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1128 | "template argument must be a complete class or an unbounded array"); | |
1129 | }; | |
f263981a | 1130 | |
f263981a PC |
1131 | /// is_copy_assignable |
1132 | template<typename _Tp> | |
1133 | struct is_copy_assignable | |
9bcedbbf JW |
1134 | : public __is_assignable_impl<__add_lval_ref_t<_Tp>, |
1135 | __add_lval_ref_t<const _Tp>> | |
608a080c AP |
1136 | { |
1137 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1138 | "template argument must be a complete class or an unbounded array"); | |
1139 | }; | |
f263981a | 1140 | |
f263981a PC |
1141 | /// is_move_assignable |
1142 | template<typename _Tp> | |
1143 | struct is_move_assignable | |
9bcedbbf | 1144 | : public __is_assignable_impl<__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>> |
608a080c AP |
1145 | { |
1146 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1147 | "template argument must be a complete class or an unbounded array"); | |
1148 | }; | |
f263981a | 1149 | |
9bcedbbf | 1150 | /// @cond undocumented |
f263981a | 1151 | template<typename _Tp, typename _Up> |
9e2256dc VV |
1152 | using __is_nothrow_assignable_impl |
1153 | = __bool_constant<__is_nothrow_assignable(_Tp, _Up)>; | |
9bcedbbf | 1154 | /// @endcond |
f263981a | 1155 | |
608a080c AP |
1156 | /// is_nothrow_assignable |
1157 | template<typename _Tp, typename _Up> | |
1158 | struct is_nothrow_assignable | |
1159 | : public __is_nothrow_assignable_impl<_Tp, _Up> | |
1160 | { | |
1161 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1162 | "template argument must be a complete class or an unbounded array"); | |
1163 | }; | |
1164 | ||
f263981a PC |
1165 | /// is_nothrow_copy_assignable |
1166 | template<typename _Tp> | |
1167 | struct is_nothrow_copy_assignable | |
9bcedbbf JW |
1168 | : public __is_nothrow_assignable_impl<__add_lval_ref_t<_Tp>, |
1169 | __add_lval_ref_t<const _Tp>> | |
608a080c AP |
1170 | { |
1171 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1172 | "template argument must be a complete class or an unbounded array"); | |
1173 | }; | |
f263981a | 1174 | |
f263981a | 1175 | /// is_nothrow_move_assignable |
65cee9bd | 1176 | template<typename _Tp> |
f263981a | 1177 | struct is_nothrow_move_assignable |
9bcedbbf JW |
1178 | : public __is_nothrow_assignable_impl<__add_lval_ref_t<_Tp>, |
1179 | __add_rval_ref_t<_Tp>> | |
608a080c AP |
1180 | { |
1181 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1182 | "template argument must be a complete class or an unbounded array"); | |
1183 | }; | |
e4f32cb0 | 1184 | |
9bcedbbf JW |
1185 | /// @cond undocumented |
1186 | template<typename _Tp, typename... _Args> | |
1187 | using __is_trivially_constructible_impl | |
1188 | = __bool_constant<__is_trivially_constructible(_Tp, _Args...)>; | |
1189 | /// @endcond | |
1190 | ||
f5e523b7 VV |
1191 | /// is_trivially_constructible |
1192 | template<typename _Tp, typename... _Args> | |
1193 | struct is_trivially_constructible | |
9bcedbbf | 1194 | : public __is_trivially_constructible_impl<_Tp, _Args...> |
608a080c AP |
1195 | { |
1196 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1197 | "template argument must be a complete class or an unbounded array"); | |
1198 | }; | |
33ac58d5 | 1199 | |
f5e523b7 VV |
1200 | /// is_trivially_default_constructible |
1201 | template<typename _Tp> | |
1202 | struct is_trivially_default_constructible | |
9bcedbbf | 1203 | : public __is_trivially_constructible_impl<_Tp> |
608a080c AP |
1204 | { |
1205 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1206 | "template argument must be a complete class or an unbounded array"); | |
1207 | }; | |
6a9ecd34 | 1208 | |
f7632193 VV |
1209 | struct __do_is_implicitly_default_constructible_impl |
1210 | { | |
1211 | template <typename _Tp> | |
1212 | static void __helper(const _Tp&); | |
1213 | ||
1214 | template <typename _Tp> | |
1215 | static true_type __test(const _Tp&, | |
1216 | decltype(__helper<const _Tp&>({}))* = 0); | |
1217 | ||
1218 | static false_type __test(...); | |
1219 | }; | |
1220 | ||
1221 | template<typename _Tp> | |
1222 | struct __is_implicitly_default_constructible_impl | |
e9029d55 JW |
1223 | : public __do_is_implicitly_default_constructible_impl |
1224 | { | |
1225 | typedef decltype(__test(declval<_Tp>())) type; | |
1226 | }; | |
f7632193 VV |
1227 | |
1228 | template<typename _Tp> | |
1229 | struct __is_implicitly_default_constructible_safe | |
e9029d55 JW |
1230 | : public __is_implicitly_default_constructible_impl<_Tp>::type |
1231 | { }; | |
f7632193 VV |
1232 | |
1233 | template <typename _Tp> | |
1234 | struct __is_implicitly_default_constructible | |
608a080c | 1235 | : public __and_<__is_constructible_impl<_Tp>, |
68c23af0 | 1236 | __is_implicitly_default_constructible_safe<_Tp>>::type |
e9029d55 | 1237 | { }; |
f7632193 | 1238 | |
608a080c | 1239 | /// is_trivially_copy_constructible |
b42cc3ca VV |
1240 | template<typename _Tp> |
1241 | struct is_trivially_copy_constructible | |
9bcedbbf | 1242 | : public __is_trivially_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
608a080c AP |
1243 | { |
1244 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1245 | "template argument must be a complete class or an unbounded array"); | |
1246 | }; | |
b42cc3ca | 1247 | |
608a080c | 1248 | /// is_trivially_move_constructible |
b42cc3ca VV |
1249 | template<typename _Tp> |
1250 | struct is_trivially_move_constructible | |
9bcedbbf | 1251 | : public __is_trivially_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
608a080c AP |
1252 | { |
1253 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1254 | "template argument must be a complete class or an unbounded array"); | |
1255 | }; | |
b42cc3ca | 1256 | |
9bcedbbf JW |
1257 | /// @cond undocumented |
1258 | template<typename _Tp, typename _Up> | |
1259 | using __is_trivially_assignable_impl | |
1260 | = __bool_constant<__is_trivially_assignable(_Tp, _Up)>; | |
1261 | /// @endcond | |
1262 | ||
f5e523b7 VV |
1263 | /// is_trivially_assignable |
1264 | template<typename _Tp, typename _Up> | |
1265 | struct is_trivially_assignable | |
9bcedbbf | 1266 | : public __is_trivially_assignable_impl<_Tp, _Up> |
608a080c AP |
1267 | { |
1268 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1269 | "template argument must be a complete class or an unbounded array"); | |
1270 | }; | |
b42cc3ca | 1271 | |
608a080c | 1272 | /// is_trivially_copy_assignable |
b42cc3ca VV |
1273 | template<typename _Tp> |
1274 | struct is_trivially_copy_assignable | |
9bcedbbf JW |
1275 | : public __is_trivially_assignable_impl<__add_lval_ref_t<_Tp>, |
1276 | __add_lval_ref_t<const _Tp>> | |
608a080c AP |
1277 | { |
1278 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1279 | "template argument must be a complete class or an unbounded array"); | |
1280 | }; | |
b42cc3ca | 1281 | |
608a080c | 1282 | /// is_trivially_move_assignable |
b42cc3ca VV |
1283 | template<typename _Tp> |
1284 | struct is_trivially_move_assignable | |
9bcedbbf JW |
1285 | : public __is_trivially_assignable_impl<__add_lval_ref_t<_Tp>, |
1286 | __add_rval_ref_t<_Tp>> | |
608a080c AP |
1287 | { |
1288 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1289 | "template argument must be a complete class or an unbounded array"); | |
1290 | }; | |
b42cc3ca | 1291 | |
6a9ecd34 PC |
1292 | /// is_trivially_destructible |
1293 | template<typename _Tp> | |
1294 | struct is_trivially_destructible | |
608a080c | 1295 | : public __and_<__is_destructible_safe<_Tp>, |
68c23af0 | 1296 | __bool_constant<__has_trivial_destructor(_Tp)>>::type |
608a080c AP |
1297 | { |
1298 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1299 | "template argument must be a complete class or an unbounded array"); | |
1300 | }; | |
6a9ecd34 | 1301 | |
e133ace8 | 1302 | |
123c516a PC |
1303 | /// has_virtual_destructor |
1304 | template<typename _Tp> | |
1305 | struct has_virtual_destructor | |
1306 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
608a080c AP |
1307 | { |
1308 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1309 | "template argument must be a complete class or an unbounded array"); | |
1310 | }; | |
123c516a | 1311 | |
33ac58d5 | 1312 | |
123c516a PC |
1313 | // type property queries. |
1314 | ||
1315 | /// alignment_of | |
1316 | template<typename _Tp> | |
1317 | struct alignment_of | |
608a080c AP |
1318 | : public integral_constant<std::size_t, alignof(_Tp)> |
1319 | { | |
1320 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1321 | "template argument must be a complete class or an unbounded array"); | |
1322 | }; | |
33ac58d5 | 1323 | |
123c516a PC |
1324 | /// rank |
1325 | template<typename> | |
1326 | struct rank | |
1327 | : public integral_constant<std::size_t, 0> { }; | |
33ac58d5 | 1328 | |
123c516a PC |
1329 | template<typename _Tp, std::size_t _Size> |
1330 | struct rank<_Tp[_Size]> | |
1331 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1332 | ||
1333 | template<typename _Tp> | |
1334 | struct rank<_Tp[]> | |
1335 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1336 | ||
1337 | /// extent | |
0e1b1222 | 1338 | template<typename, unsigned _Uint = 0> |
123c516a | 1339 | struct extent |
0e1b1222 | 1340 | : public integral_constant<size_t, 0> { }; |
33ac58d5 | 1341 | |
0e1b1222 JW |
1342 | template<typename _Tp, size_t _Size> |
1343 | struct extent<_Tp[_Size], 0> | |
1344 | : public integral_constant<size_t, _Size> { }; | |
1345 | ||
1346 | template<typename _Tp, unsigned _Uint, size_t _Size> | |
123c516a | 1347 | struct extent<_Tp[_Size], _Uint> |
0e1b1222 JW |
1348 | : public extent<_Tp, _Uint - 1>::type { }; |
1349 | ||
1350 | template<typename _Tp> | |
1351 | struct extent<_Tp[], 0> | |
1352 | : public integral_constant<size_t, 0> { }; | |
123c516a PC |
1353 | |
1354 | template<typename _Tp, unsigned _Uint> | |
1355 | struct extent<_Tp[], _Uint> | |
0e1b1222 | 1356 | : public extent<_Tp, _Uint - 1>::type { }; |
123c516a PC |
1357 | |
1358 | ||
c0ffa2ba | 1359 | // Type relations. |
123c516a PC |
1360 | |
1361 | /// is_same | |
02f6fdff | 1362 | template<typename _Tp, typename _Up> |
123c516a | 1363 | struct is_same |
73ae6eb5 JW |
1364 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
1365 | : public integral_constant<bool, __is_same(_Tp, _Up)> | |
44af818f JW |
1366 | #else |
1367 | : public false_type | |
1368 | #endif | |
02f6fdff | 1369 | { }; |
b0302c68 | 1370 | |
73ae6eb5 | 1371 | #ifndef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
44af818f JW |
1372 | template<typename _Tp> |
1373 | struct is_same<_Tp, _Tp> | |
1374 | : public true_type | |
1375 | { }; | |
1376 | #endif | |
1377 | ||
939759fc | 1378 | /// is_base_of |
e133ace8 PC |
1379 | template<typename _Base, typename _Derived> |
1380 | struct is_base_of | |
1381 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1382 | { }; | |
1383 | ||
af85ad89 JW |
1384 | #if __has_builtin(__is_convertible) |
1385 | template<typename _From, typename _To> | |
1386 | struct is_convertible | |
1387 | : public __bool_constant<__is_convertible(_From, _To)> | |
1388 | { }; | |
1389 | #else | |
297f34d7 | 1390 | template<typename _From, typename _To, |
123c516a PC |
1391 | bool = __or_<is_void<_From>, is_function<_To>, |
1392 | is_array<_To>>::value> | |
297f34d7 | 1393 | struct __is_convertible_helper |
8df27fcb JW |
1394 | { |
1395 | typedef typename is_void<_To>::type type; | |
8df27fcb | 1396 | }; |
297f34d7 | 1397 | |
cc28d234 JW |
1398 | #pragma GCC diagnostic push |
1399 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
e133ace8 | 1400 | template<typename _From, typename _To> |
b0302c68 | 1401 | class __is_convertible_helper<_From, _To, false> |
e133ace8 | 1402 | { |
8df27fcb JW |
1403 | template<typename _To1> |
1404 | static void __test_aux(_To1) noexcept; | |
8e7d962a | 1405 | |
82b12c4b FD |
1406 | template<typename _From1, typename _To1, |
1407 | typename = decltype(__test_aux<_To1>(std::declval<_From1>()))> | |
1408 | static true_type | |
8e7d962a PC |
1409 | __test(int); |
1410 | ||
1411 | template<typename, typename> | |
82b12c4b FD |
1412 | static false_type |
1413 | __test(...); | |
297f34d7 | 1414 | |
e133ace8 | 1415 | public: |
82b12c4b | 1416 | typedef decltype(__test<_From, _To>(0)) type; |
e133ace8 | 1417 | }; |
cc28d234 | 1418 | #pragma GCC diagnostic pop |
82b12c4b | 1419 | |
b0302c68 | 1420 | /// is_convertible |
e133ace8 PC |
1421 | template<typename _From, typename _To> |
1422 | struct is_convertible | |
82b12c4b | 1423 | : public __is_convertible_helper<_From, _To>::type |
e133ace8 | 1424 | { }; |
af85ad89 | 1425 | #endif |
e133ace8 | 1426 | |
0302a2de JW |
1427 | // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N> |
1428 | template<typename _ToElementType, typename _FromElementType> | |
1429 | using __is_array_convertible | |
1430 | = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>; | |
1431 | ||
af85ad89 JW |
1432 | #if __cplusplus >= 202002L |
1433 | #define __cpp_lib_is_nothrow_convertible 201806L | |
1434 | ||
1435 | #if __has_builtin(__is_nothrow_convertible) | |
1436 | /// is_nothrow_convertible_v | |
1437 | template<typename _From, typename _To> | |
1438 | inline constexpr bool is_nothrow_convertible_v | |
1439 | = __is_nothrow_convertible(_From, _To); | |
1440 | ||
1441 | /// is_nothrow_convertible | |
1442 | template<typename _From, typename _To> | |
1443 | struct is_nothrow_convertible | |
1444 | : public bool_constant<is_nothrow_convertible_v<_From, _To>> | |
1445 | { }; | |
1446 | #else | |
608a080c | 1447 | template<typename _From, typename _To, |
ed99e818 JW |
1448 | bool = __or_<is_void<_From>, is_function<_To>, |
1449 | is_array<_To>>::value> | |
1450 | struct __is_nt_convertible_helper | |
1451 | : is_void<_To> | |
1452 | { }; | |
1453 | ||
cc28d234 JW |
1454 | #pragma GCC diagnostic push |
1455 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
ed99e818 JW |
1456 | template<typename _From, typename _To> |
1457 | class __is_nt_convertible_helper<_From, _To, false> | |
1458 | { | |
1459 | template<typename _To1> | |
1460 | static void __test_aux(_To1) noexcept; | |
1461 | ||
1462 | template<typename _From1, typename _To1> | |
ce9f305e JW |
1463 | static |
1464 | __bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))> | |
ed99e818 JW |
1465 | __test(int); |
1466 | ||
1467 | template<typename, typename> | |
1468 | static false_type | |
1469 | __test(...); | |
1470 | ||
1471 | public: | |
1472 | using type = decltype(__test<_From, _To>(0)); | |
1473 | }; | |
cc28d234 | 1474 | #pragma GCC diagnostic pop |
ed99e818 | 1475 | |
8df27fcb JW |
1476 | /// is_nothrow_convertible |
1477 | template<typename _From, typename _To> | |
1478 | struct is_nothrow_convertible | |
ed99e818 | 1479 | : public __is_nt_convertible_helper<_From, _To>::type |
8df27fcb JW |
1480 | { }; |
1481 | ||
1482 | /// is_nothrow_convertible_v | |
1483 | template<typename _From, typename _To> | |
1484 | inline constexpr bool is_nothrow_convertible_v | |
1485 | = is_nothrow_convertible<_From, _To>::value; | |
af85ad89 | 1486 | #endif |
8df27fcb | 1487 | #endif // C++2a |
fd735b6a | 1488 | |
c0ffa2ba | 1489 | // Const-volatile modifications. |
7b50cdef | 1490 | |
123c516a | 1491 | /// remove_const |
7b50cdef | 1492 | template<typename _Tp> |
123c516a PC |
1493 | struct remove_const |
1494 | { typedef _Tp type; }; | |
7b50cdef | 1495 | |
123c516a PC |
1496 | template<typename _Tp> |
1497 | struct remove_const<_Tp const> | |
1498 | { typedef _Tp type; }; | |
33ac58d5 | 1499 | |
123c516a PC |
1500 | /// remove_volatile |
1501 | template<typename _Tp> | |
1502 | struct remove_volatile | |
1503 | { typedef _Tp type; }; | |
7b50cdef | 1504 | |
123c516a PC |
1505 | template<typename _Tp> |
1506 | struct remove_volatile<_Tp volatile> | |
1507 | { typedef _Tp type; }; | |
33ac58d5 | 1508 | |
123c516a PC |
1509 | /// remove_cv |
1510 | template<typename _Tp> | |
1511 | struct remove_cv | |
391d5d2e JW |
1512 | { using type = _Tp; }; |
1513 | ||
1514 | template<typename _Tp> | |
1515 | struct remove_cv<const _Tp> | |
1516 | { using type = _Tp; }; | |
1517 | ||
1518 | template<typename _Tp> | |
1519 | struct remove_cv<volatile _Tp> | |
1520 | { using type = _Tp; }; | |
1521 | ||
1522 | template<typename _Tp> | |
1523 | struct remove_cv<const volatile _Tp> | |
1524 | { using type = _Tp; }; | |
33ac58d5 | 1525 | |
123c516a PC |
1526 | /// add_const |
1527 | template<typename _Tp> | |
1528 | struct add_const | |
8be17e2a | 1529 | { using type = _Tp const; }; |
33ac58d5 | 1530 | |
123c516a PC |
1531 | /// add_volatile |
1532 | template<typename _Tp> | |
1533 | struct add_volatile | |
8be17e2a | 1534 | { using type = _Tp volatile; }; |
33ac58d5 | 1535 | |
123c516a PC |
1536 | /// add_cv |
1537 | template<typename _Tp> | |
1538 | struct add_cv | |
8be17e2a | 1539 | { using type = _Tp const volatile; }; |
7b50cdef | 1540 | |
4457e88c | 1541 | #if __cplusplus > 201103L |
a15f7cb8 | 1542 | |
b8806796 | 1543 | #define __cpp_lib_transformation_trait_aliases 201304L |
a15f7cb8 | 1544 | |
4457e88c JW |
1545 | /// Alias template for remove_const |
1546 | template<typename _Tp> | |
1547 | using remove_const_t = typename remove_const<_Tp>::type; | |
1548 | ||
1549 | /// Alias template for remove_volatile | |
1550 | template<typename _Tp> | |
1551 | using remove_volatile_t = typename remove_volatile<_Tp>::type; | |
1552 | ||
1553 | /// Alias template for remove_cv | |
1554 | template<typename _Tp> | |
1555 | using remove_cv_t = typename remove_cv<_Tp>::type; | |
1556 | ||
1557 | /// Alias template for add_const | |
1558 | template<typename _Tp> | |
1559 | using add_const_t = typename add_const<_Tp>::type; | |
1560 | ||
1561 | /// Alias template for add_volatile | |
1562 | template<typename _Tp> | |
1563 | using add_volatile_t = typename add_volatile<_Tp>::type; | |
1564 | ||
1565 | /// Alias template for add_cv | |
1566 | template<typename _Tp> | |
1567 | using add_cv_t = typename add_cv<_Tp>::type; | |
1568 | #endif | |
7b50cdef | 1569 | |
123c516a | 1570 | // Reference transformations. |
7b50cdef | 1571 | |
123c516a PC |
1572 | /// remove_reference |
1573 | template<typename _Tp> | |
1574 | struct remove_reference | |
1575 | { typedef _Tp type; }; | |
7b50cdef | 1576 | |
123c516a PC |
1577 | template<typename _Tp> |
1578 | struct remove_reference<_Tp&> | |
1579 | { typedef _Tp type; }; | |
7b50cdef | 1580 | |
123c516a PC |
1581 | template<typename _Tp> |
1582 | struct remove_reference<_Tp&&> | |
1583 | { typedef _Tp type; }; | |
1584 | ||
123c516a | 1585 | /// add_lvalue_reference |
5e108459 | 1586 | template<typename _Tp> |
123c516a | 1587 | struct add_lvalue_reference |
9bcedbbf | 1588 | { using type = __add_lval_ref_t<_Tp>; }; |
5e108459 | 1589 | |
123c516a | 1590 | /// add_rvalue_reference |
5e108459 | 1591 | template<typename _Tp> |
123c516a | 1592 | struct add_rvalue_reference |
9bcedbbf | 1593 | { using type = __add_rval_ref_t<_Tp>; }; |
5e108459 | 1594 | |
4457e88c JW |
1595 | #if __cplusplus > 201103L |
1596 | /// Alias template for remove_reference | |
1597 | template<typename _Tp> | |
1598 | using remove_reference_t = typename remove_reference<_Tp>::type; | |
1599 | ||
1600 | /// Alias template for add_lvalue_reference | |
1601 | template<typename _Tp> | |
1602 | using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; | |
1603 | ||
1604 | /// Alias template for add_rvalue_reference | |
1605 | template<typename _Tp> | |
1606 | using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; | |
1607 | #endif | |
7b50cdef | 1608 | |
c0ffa2ba | 1609 | // Sign modifications. |
123c516a | 1610 | |
6963c3b9 JW |
1611 | /// @cond undocumented |
1612 | ||
7b50cdef BK |
1613 | // Utility for constructing identically cv-qualified types. |
1614 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1615 | struct __cv_selector; | |
1616 | ||
1617 | template<typename _Unqualified> | |
1618 | struct __cv_selector<_Unqualified, false, false> | |
1619 | { typedef _Unqualified __type; }; | |
1620 | ||
1621 | template<typename _Unqualified> | |
1622 | struct __cv_selector<_Unqualified, false, true> | |
1623 | { typedef volatile _Unqualified __type; }; | |
1624 | ||
1625 | template<typename _Unqualified> | |
1626 | struct __cv_selector<_Unqualified, true, false> | |
1627 | { typedef const _Unqualified __type; }; | |
1628 | ||
1629 | template<typename _Unqualified> | |
1630 | struct __cv_selector<_Unqualified, true, true> | |
1631 | { typedef const volatile _Unqualified __type; }; | |
1632 | ||
1633 | template<typename _Qualified, typename _Unqualified, | |
1634 | bool _IsConst = is_const<_Qualified>::value, | |
1635 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1636 | class __match_cv_qualifiers |
7b50cdef | 1637 | { |
7b50cdef BK |
1638 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1639 | ||
1640 | public: | |
33ac58d5 | 1641 | typedef typename __match::__type __type; |
7b50cdef BK |
1642 | }; |
1643 | ||
7b50cdef BK |
1644 | // Utility for finding the unsigned versions of signed integral types. |
1645 | template<typename _Tp> | |
e133ace8 PC |
1646 | struct __make_unsigned |
1647 | { typedef _Tp __type; }; | |
7b50cdef BK |
1648 | |
1649 | template<> | |
1650 | struct __make_unsigned<char> | |
1651 | { typedef unsigned char __type; }; | |
1652 | ||
1653 | template<> | |
1654 | struct __make_unsigned<signed char> | |
1655 | { typedef unsigned char __type; }; | |
1656 | ||
7b50cdef BK |
1657 | template<> |
1658 | struct __make_unsigned<short> | |
1659 | { typedef unsigned short __type; }; | |
1660 | ||
1661 | template<> | |
1662 | struct __make_unsigned<int> | |
1663 | { typedef unsigned int __type; }; | |
1664 | ||
1665 | template<> | |
1666 | struct __make_unsigned<long> | |
1667 | { typedef unsigned long __type; }; | |
1668 | ||
1669 | template<> | |
1670 | struct __make_unsigned<long long> | |
1671 | { typedef unsigned long long __type; }; | |
1672 | ||
78a7c317 | 1673 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1674 | __extension__ |
78a7c317 DD |
1675 | template<> |
1676 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0> | |
1677 | { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1678 | #endif | |
1679 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1680 | __extension__ |
78a7c317 DD |
1681 | template<> |
1682 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1> | |
1683 | { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1684 | #endif | |
1685 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1686 | __extension__ |
6d585f01 | 1687 | template<> |
78a7c317 DD |
1688 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2> |
1689 | { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1690 | #endif | |
1691 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1692 | __extension__ |
78a7c317 DD |
1693 | template<> |
1694 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3> | |
1695 | { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1696 | #endif |
1697 | ||
7b50cdef | 1698 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1699 | template<typename _Tp, |
7b50cdef | 1700 | bool _IsInt = is_integral<_Tp>::value, |
7b50cdef | 1701 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1702 | class __make_unsigned_selector; |
1703 | ||
7b50cdef | 1704 | template<typename _Tp> |
b0302c68 | 1705 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1706 | { |
22f1f4c7 | 1707 | using __unsigned_type |
391d5d2e | 1708 | = typename __make_unsigned<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1709 | |
1710 | public: | |
22f1f4c7 JW |
1711 | using __type |
1712 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
7b50cdef BK |
1713 | }; |
1714 | ||
22f1f4c7 JW |
1715 | class __make_unsigned_selector_base |
1716 | { | |
1717 | protected: | |
1718 | template<typename...> struct _List { }; | |
1719 | ||
1720 | template<typename _Tp, typename... _Up> | |
1721 | struct _List<_Tp, _Up...> : _List<_Up...> | |
1722 | { static constexpr size_t __size = sizeof(_Tp); }; | |
1723 | ||
1724 | template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)> | |
1725 | struct __select; | |
1726 | ||
1727 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1728 | struct __select<_Sz, _List<_Uint, _UInts...>, true> | |
1729 | { using __type = _Uint; }; | |
1730 | ||
1731 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1732 | struct __select<_Sz, _List<_Uint, _UInts...>, false> | |
1733 | : __select<_Sz, _List<_UInts...>> | |
1734 | { }; | |
1735 | }; | |
1736 | ||
1737 | // Choose unsigned integer type with the smallest rank and same size as _Tp | |
7b50cdef | 1738 | template<typename _Tp> |
b0302c68 | 1739 | class __make_unsigned_selector<_Tp, false, true> |
22f1f4c7 | 1740 | : __make_unsigned_selector_base |
7b50cdef | 1741 | { |
a0230468 | 1742 | // With -fshort-enums, an enum may be as small as a char. |
22f1f4c7 JW |
1743 | using _UInts = _List<unsigned char, unsigned short, unsigned int, |
1744 | unsigned long, unsigned long long>; | |
1745 | ||
1746 | using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type; | |
73d81d3a | 1747 | |
7b50cdef | 1748 | public: |
22f1f4c7 JW |
1749 | using __type |
1750 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
1751 | }; | |
1752 | ||
c124af93 TH |
1753 | // wchar_t, char8_t, char16_t and char32_t are integral types but are |
1754 | // neither signed integer types nor unsigned integer types, so must be | |
22f1f4c7 JW |
1755 | // transformed to the unsigned integer type with the smallest rank. |
1756 | // Use the partial specialization for enumeration types to do that. | |
22f1f4c7 JW |
1757 | template<> |
1758 | struct __make_unsigned<wchar_t> | |
1759 | { | |
1760 | using __type | |
1761 | = typename __make_unsigned_selector<wchar_t, false, true>::__type; | |
1762 | }; | |
22f1f4c7 | 1763 | |
c124af93 TH |
1764 | #ifdef _GLIBCXX_USE_CHAR8_T |
1765 | template<> | |
1766 | struct __make_unsigned<char8_t> | |
1767 | { | |
1768 | using __type | |
1769 | = typename __make_unsigned_selector<char8_t, false, true>::__type; | |
1770 | }; | |
1771 | #endif | |
1772 | ||
22f1f4c7 JW |
1773 | template<> |
1774 | struct __make_unsigned<char16_t> | |
1775 | { | |
1776 | using __type | |
1777 | = typename __make_unsigned_selector<char16_t, false, true>::__type; | |
1778 | }; | |
1779 | ||
1780 | template<> | |
1781 | struct __make_unsigned<char32_t> | |
1782 | { | |
1783 | using __type | |
1784 | = typename __make_unsigned_selector<char32_t, false, true>::__type; | |
7b50cdef | 1785 | }; |
6963c3b9 | 1786 | /// @endcond |
7b50cdef | 1787 | |
7b50cdef BK |
1788 | // Given an integral/enum type, return the corresponding unsigned |
1789 | // integer type. | |
5b9daa7e BK |
1790 | // Primary template. |
1791 | /// make_unsigned | |
7b50cdef | 1792 | template<typename _Tp> |
33ac58d5 | 1793 | struct make_unsigned |
7b50cdef BK |
1794 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; |
1795 | ||
1796 | // Integral, but don't define. | |
1797 | template<> | |
1798 | struct make_unsigned<bool>; | |
1799 | ||
6963c3b9 | 1800 | /// @cond undocumented |
7b50cdef BK |
1801 | |
1802 | // Utility for finding the signed versions of unsigned integral types. | |
1803 | template<typename _Tp> | |
e133ace8 PC |
1804 | struct __make_signed |
1805 | { typedef _Tp __type; }; | |
7b50cdef BK |
1806 | |
1807 | template<> | |
1808 | struct __make_signed<char> | |
1809 | { typedef signed char __type; }; | |
1810 | ||
1811 | template<> | |
1812 | struct __make_signed<unsigned char> | |
1813 | { typedef signed char __type; }; | |
1814 | ||
7b50cdef BK |
1815 | template<> |
1816 | struct __make_signed<unsigned short> | |
1817 | { typedef signed short __type; }; | |
1818 | ||
1819 | template<> | |
1820 | struct __make_signed<unsigned int> | |
1821 | { typedef signed int __type; }; | |
1822 | ||
1823 | template<> | |
1824 | struct __make_signed<unsigned long> | |
1825 | { typedef signed long __type; }; | |
1826 | ||
1827 | template<> | |
1828 | struct __make_signed<unsigned long long> | |
1829 | { typedef signed long long __type; }; | |
1830 | ||
78a7c317 | 1831 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1832 | __extension__ |
78a7c317 DD |
1833 | template<> |
1834 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0> | |
1835 | { typedef __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1836 | #endif | |
1837 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1838 | __extension__ |
78a7c317 DD |
1839 | template<> |
1840 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1> | |
1841 | { typedef __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1842 | #endif | |
1843 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1844 | __extension__ |
78a7c317 DD |
1845 | template<> |
1846 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2> | |
1847 | { typedef __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1848 | #endif | |
1849 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1850 | __extension__ |
6d585f01 | 1851 | template<> |
78a7c317 DD |
1852 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3> |
1853 | { typedef __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1854 | #endif |
1855 | ||
fb8ffd10 | 1856 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1857 | template<typename _Tp, |
7b50cdef | 1858 | bool _IsInt = is_integral<_Tp>::value, |
7b50cdef | 1859 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1860 | class __make_signed_selector; |
1861 | ||
7b50cdef | 1862 | template<typename _Tp> |
b0302c68 | 1863 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1864 | { |
22f1f4c7 | 1865 | using __signed_type |
391d5d2e | 1866 | = typename __make_signed<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1867 | |
1868 | public: | |
22f1f4c7 JW |
1869 | using __type |
1870 | = typename __match_cv_qualifiers<_Tp, __signed_type>::__type; | |
7b50cdef BK |
1871 | }; |
1872 | ||
22f1f4c7 | 1873 | // Choose signed integer type with the smallest rank and same size as _Tp |
7b50cdef | 1874 | template<typename _Tp> |
b0302c68 | 1875 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1876 | { |
73d81d3a | 1877 | typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type; |
7b50cdef BK |
1878 | |
1879 | public: | |
73d81d3a | 1880 | typedef typename __make_signed_selector<__unsigned_type>::__type __type; |
7b50cdef BK |
1881 | }; |
1882 | ||
22f1f4c7 | 1883 | // wchar_t, char16_t and char32_t are integral types but are neither |
d4b695e4 | 1884 | // signed integer types nor unsigned integer types, so must be |
22f1f4c7 JW |
1885 | // transformed to the signed integer type with the smallest rank. |
1886 | // Use the partial specialization for enumeration types to do that. | |
22f1f4c7 JW |
1887 | template<> |
1888 | struct __make_signed<wchar_t> | |
1889 | { | |
1890 | using __type | |
1891 | = typename __make_signed_selector<wchar_t, false, true>::__type; | |
1892 | }; | |
22f1f4c7 | 1893 | |
c124af93 TH |
1894 | #if defined(_GLIBCXX_USE_CHAR8_T) |
1895 | template<> | |
1896 | struct __make_signed<char8_t> | |
1897 | { | |
1898 | using __type | |
1899 | = typename __make_signed_selector<char8_t, false, true>::__type; | |
1900 | }; | |
1901 | #endif | |
1902 | ||
22f1f4c7 JW |
1903 | template<> |
1904 | struct __make_signed<char16_t> | |
1905 | { | |
1906 | using __type | |
1907 | = typename __make_signed_selector<char16_t, false, true>::__type; | |
1908 | }; | |
1909 | ||
1910 | template<> | |
1911 | struct __make_signed<char32_t> | |
1912 | { | |
1913 | using __type | |
1914 | = typename __make_signed_selector<char32_t, false, true>::__type; | |
1915 | }; | |
6963c3b9 | 1916 | /// @endcond |
22f1f4c7 | 1917 | |
7b50cdef BK |
1918 | // Given an integral/enum type, return the corresponding signed |
1919 | // integer type. | |
5b9daa7e BK |
1920 | // Primary template. |
1921 | /// make_signed | |
7b50cdef | 1922 | template<typename _Tp> |
33ac58d5 | 1923 | struct make_signed |
7b50cdef BK |
1924 | { typedef typename __make_signed_selector<_Tp>::__type type; }; |
1925 | ||
1926 | // Integral, but don't define. | |
1927 | template<> | |
1928 | struct make_signed<bool>; | |
cfa9a96b | 1929 | |
4457e88c JW |
1930 | #if __cplusplus > 201103L |
1931 | /// Alias template for make_signed | |
1932 | template<typename _Tp> | |
1933 | using make_signed_t = typename make_signed<_Tp>::type; | |
1934 | ||
1935 | /// Alias template for make_unsigned | |
1936 | template<typename _Tp> | |
1937 | using make_unsigned_t = typename make_unsigned<_Tp>::type; | |
1938 | #endif | |
123c516a | 1939 | |
c0ffa2ba | 1940 | // Array modifications. |
123c516a PC |
1941 | |
1942 | /// remove_extent | |
1943 | template<typename _Tp> | |
1944 | struct remove_extent | |
1945 | { typedef _Tp type; }; | |
1946 | ||
1947 | template<typename _Tp, std::size_t _Size> | |
1948 | struct remove_extent<_Tp[_Size]> | |
1949 | { typedef _Tp type; }; | |
1950 | ||
1951 | template<typename _Tp> | |
1952 | struct remove_extent<_Tp[]> | |
1953 | { typedef _Tp type; }; | |
1954 | ||
1955 | /// remove_all_extents | |
1956 | template<typename _Tp> | |
1957 | struct remove_all_extents | |
1958 | { typedef _Tp type; }; | |
1959 | ||
1960 | template<typename _Tp, std::size_t _Size> | |
1961 | struct remove_all_extents<_Tp[_Size]> | |
1962 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1963 | ||
1964 | template<typename _Tp> | |
1965 | struct remove_all_extents<_Tp[]> | |
1966 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1967 | ||
4457e88c JW |
1968 | #if __cplusplus > 201103L |
1969 | /// Alias template for remove_extent | |
1970 | template<typename _Tp> | |
1971 | using remove_extent_t = typename remove_extent<_Tp>::type; | |
1972 | ||
1973 | /// Alias template for remove_all_extents | |
1974 | template<typename _Tp> | |
1975 | using remove_all_extents_t = typename remove_all_extents<_Tp>::type; | |
1976 | #endif | |
123c516a | 1977 | |
c0ffa2ba | 1978 | // Pointer modifications. |
123c516a PC |
1979 | |
1980 | template<typename _Tp, typename> | |
1981 | struct __remove_pointer_helper | |
1982 | { typedef _Tp type; }; | |
1983 | ||
1984 | template<typename _Tp, typename _Up> | |
1985 | struct __remove_pointer_helper<_Tp, _Up*> | |
1986 | { typedef _Up type; }; | |
1987 | ||
1988 | /// remove_pointer | |
1989 | template<typename _Tp> | |
1990 | struct remove_pointer | |
391d5d2e | 1991 | : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>> |
123c516a PC |
1992 | { }; |
1993 | ||
56bb34e3 | 1994 | template<typename _Tp, typename = void> |
89898034 | 1995 | struct __add_pointer_helper |
56bb34e3 | 1996 | { using type = _Tp; }; |
89898034 | 1997 | |
123c516a | 1998 | template<typename _Tp> |
56bb34e3 JW |
1999 | struct __add_pointer_helper<_Tp, __void_t<_Tp*>> |
2000 | { using type = _Tp*; }; | |
123c516a | 2001 | |
6963c3b9 | 2002 | /// add_pointer |
89898034 | 2003 | template<typename _Tp> |
33ac58d5 | 2004 | struct add_pointer |
89898034 DK |
2005 | : public __add_pointer_helper<_Tp> |
2006 | { }; | |
2007 | ||
56bb34e3 JW |
2008 | template<typename _Tp> |
2009 | struct add_pointer<_Tp&> | |
2010 | { using type = _Tp*; }; | |
2011 | ||
2012 | template<typename _Tp> | |
2013 | struct add_pointer<_Tp&&> | |
2014 | { using type = _Tp*; }; | |
2015 | ||
4457e88c JW |
2016 | #if __cplusplus > 201103L |
2017 | /// Alias template for remove_pointer | |
2018 | template<typename _Tp> | |
2019 | using remove_pointer_t = typename remove_pointer<_Tp>::type; | |
2020 | ||
2021 | /// Alias template for add_pointer | |
2022 | template<typename _Tp> | |
2023 | using add_pointer_t = typename add_pointer<_Tp>::type; | |
2024 | #endif | |
123c516a PC |
2025 | |
2026 | template<std::size_t _Len> | |
2027 | struct __aligned_storage_msa | |
33ac58d5 | 2028 | { |
123c516a PC |
2029 | union __type |
2030 | { | |
2031 | unsigned char __data[_Len]; | |
33ac58d5 | 2032 | struct __attribute__((__aligned__)) { } __align; |
123c516a PC |
2033 | }; |
2034 | }; | |
2035 | ||
2036 | /** | |
2037 | * @brief Alignment type. | |
2038 | * | |
2039 | * The value of _Align is a default-alignment which shall be the | |
2040 | * most stringent alignment requirement for any C++ object type | |
2041 | * whose size is no greater than _Len (3.9). The member typedef | |
2042 | * type shall be a POD type suitable for use as uninitialized | |
2043 | * storage for any object whose size is at most _Len and whose | |
2044 | * alignment is a divisor of _Align. | |
2045 | */ | |
2046 | template<std::size_t _Len, std::size_t _Align = | |
2047 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2048 | struct aligned_storage | |
33ac58d5 | 2049 | { |
123c516a PC |
2050 | union type |
2051 | { | |
2052 | unsigned char __data[_Len]; | |
33ac58d5 | 2053 | struct __attribute__((__aligned__((_Align)))) { } __align; |
123c516a PC |
2054 | }; |
2055 | }; | |
2056 | ||
d3718027 RS |
2057 | template <typename... _Types> |
2058 | struct __strictest_alignment | |
2059 | { | |
2060 | static const size_t _S_alignment = 0; | |
2061 | static const size_t _S_size = 0; | |
2062 | }; | |
2063 | ||
2064 | template <typename _Tp, typename... _Types> | |
2065 | struct __strictest_alignment<_Tp, _Types...> | |
2066 | { | |
2067 | static const size_t _S_alignment = | |
2068 | alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment | |
2069 | ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment; | |
2070 | static const size_t _S_size = | |
2071 | sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size | |
2072 | ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size; | |
2073 | }; | |
2074 | ||
2075 | /** | |
2076 | * @brief Provide aligned storage for types. | |
2077 | * | |
2078 | * [meta.trans.other] | |
2079 | * | |
2080 | * Provides aligned storage for any of the provided types of at | |
2081 | * least size _Len. | |
2082 | * | |
2083 | * @see aligned_storage | |
2084 | */ | |
2085 | template <size_t _Len, typename... _Types> | |
2086 | struct aligned_union | |
2087 | { | |
2088 | private: | |
2089 | static_assert(sizeof...(_Types) != 0, "At least one type is required"); | |
2090 | ||
2091 | using __strictest = __strictest_alignment<_Types...>; | |
2092 | static const size_t _S_len = _Len > __strictest::_S_size | |
2093 | ? _Len : __strictest::_S_size; | |
2094 | public: | |
2095 | /// The value of the strictest alignment of _Types. | |
2096 | static const size_t alignment_value = __strictest::_S_alignment; | |
2097 | /// The storage. | |
2098 | typedef typename aligned_storage<_S_len, alignment_value>::type type; | |
2099 | }; | |
2100 | ||
2101 | template <size_t _Len, typename... _Types> | |
2102 | const size_t aligned_union<_Len, _Types...>::alignment_value; | |
123c516a | 2103 | |
6963c3b9 JW |
2104 | /// @cond undocumented |
2105 | ||
123c516a PC |
2106 | // Decay trait for arrays and functions, used for perfect forwarding |
2107 | // in make_pair, make_tuple, etc. | |
33ac58d5 | 2108 | template<typename _Up> |
775fe01b JW |
2109 | struct __decay_selector |
2110 | : __conditional_t<is_const<const _Up>::value, // false for functions | |
2111 | remove_cv<_Up>, // N.B. DR 705. | |
2112 | add_pointer<_Up>> // function decays to pointer | |
2113 | { }; | |
123c516a | 2114 | |
775fe01b JW |
2115 | template<typename _Up, size_t _Nm> |
2116 | struct __decay_selector<_Up[_Nm]> | |
2117 | { using type = _Up*; }; | |
123c516a | 2118 | |
33ac58d5 | 2119 | template<typename _Up> |
775fe01b JW |
2120 | struct __decay_selector<_Up[]> |
2121 | { using type = _Up*; }; | |
2122 | ||
6963c3b9 | 2123 | /// @endcond |
123c516a PC |
2124 | |
2125 | /// decay | |
33ac58d5 | 2126 | template<typename _Tp> |
775fe01b JW |
2127 | struct decay |
2128 | { using type = typename __decay_selector<_Tp>::type; }; | |
123c516a | 2129 | |
775fe01b JW |
2130 | template<typename _Tp> |
2131 | struct decay<_Tp&> | |
2132 | { using type = typename __decay_selector<_Tp>::type; }; | |
2133 | ||
2134 | template<typename _Tp> | |
2135 | struct decay<_Tp&&> | |
2136 | { using type = typename __decay_selector<_Tp>::type; }; | |
123c516a | 2137 | |
6963c3b9 | 2138 | /// @cond undocumented |
123c516a PC |
2139 | |
2140 | // Helper which adds a reference to a type when given a reference_wrapper | |
2141 | template<typename _Tp> | |
2142 | struct __strip_reference_wrapper | |
2143 | { | |
2144 | typedef _Tp __type; | |
2145 | }; | |
2146 | ||
2147 | template<typename _Tp> | |
2148 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
2149 | { | |
2150 | typedef _Tp& __type; | |
2151 | }; | |
2152 | ||
6963c3b9 | 2153 | // __decay_t (std::decay_t for C++11). |
123c516a | 2154 | template<typename _Tp> |
6963c3b9 | 2155 | using __decay_t = typename decay<_Tp>::type; |
123c516a | 2156 | |
6963c3b9 JW |
2157 | template<typename _Tp> |
2158 | using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>; | |
2159 | /// @endcond | |
123c516a | 2160 | |
6963c3b9 JW |
2161 | /// @cond undocumented |
2162 | ||
6963c3b9 | 2163 | // Helper for SFINAE constraints |
23df8534 | 2164 | template<typename... _Cond> |
391d5d2e | 2165 | using _Require = __enable_if_t<__and_<_Cond...>::value>; |
123c516a | 2166 | |
6963c3b9 JW |
2167 | // __remove_cvref_t (std::remove_cvref_t for C++11). |
2168 | template<typename _Tp> | |
2169 | using __remove_cvref_t | |
2170 | = typename remove_cv<typename remove_reference<_Tp>::type>::type; | |
2171 | /// @endcond | |
2172 | ||
123c516a | 2173 | // Primary template. |
13901e4b | 2174 | /// Define a member typedef @c type to one of two argument types. |
123c516a PC |
2175 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2176 | struct conditional | |
2177 | { typedef _Iftrue type; }; | |
2178 | ||
2179 | // Partial specialization for false. | |
2180 | template<typename _Iftrue, typename _Iffalse> | |
2181 | struct conditional<false, _Iftrue, _Iffalse> | |
2182 | { typedef _Iffalse type; }; | |
2183 | ||
5b9daa7e | 2184 | /// common_type |
cfa9a96b CF |
2185 | template<typename... _Tp> |
2186 | struct common_type; | |
2187 | ||
c0ffa2ba | 2188 | // Sfinae-friendly common_type implementation: |
b3618b71 | 2189 | |
6963c3b9 | 2190 | /// @cond undocumented |
8492f7dd JW |
2191 | |
2192 | // For several sfinae-friendly trait implementations we transport both the | |
2193 | // result information (as the member type) and the failure information (no | |
2194 | // member type). This is very similar to std::enable_if, but we cannot use | |
2195 | // that, because we need to derive from them as an implementation detail. | |
2196 | ||
2197 | template<typename _Tp> | |
2198 | struct __success_type | |
2199 | { typedef _Tp type; }; | |
2200 | ||
2201 | struct __failure_type | |
2202 | { }; | |
2203 | ||
b3618b71 DK |
2204 | struct __do_common_type_impl |
2205 | { | |
2206 | template<typename _Tp, typename _Up> | |
f61a12b3 JW |
2207 | using __cond_t |
2208 | = decltype(true ? std::declval<_Tp>() : std::declval<_Up>()); | |
2209 | ||
0f8b14ee JW |
2210 | // if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2211 | // denotes a valid type, let C denote that type. | |
f61a12b3 | 2212 | template<typename _Tp, typename _Up> |
0f8b14ee | 2213 | static __success_type<__decay_t<__cond_t<_Tp, _Up>>> |
f61a12b3 | 2214 | _S_test(int); |
b3618b71 | 2215 | |
0f8b14ee JW |
2216 | #if __cplusplus > 201703L |
2217 | // Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type, | |
2218 | // let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>. | |
2219 | template<typename _Tp, typename _Up> | |
2220 | static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>> | |
2221 | _S_test_2(int); | |
2222 | #endif | |
2223 | ||
b3618b71 | 2224 | template<typename, typename> |
f61a12b3 | 2225 | static __failure_type |
0f8b14ee JW |
2226 | _S_test_2(...); |
2227 | ||
2228 | template<typename _Tp, typename _Up> | |
2229 | static decltype(_S_test_2<_Tp, _Up>(0)) | |
f61a12b3 | 2230 | _S_test(...); |
b3618b71 DK |
2231 | }; |
2232 | ||
f61a12b3 JW |
2233 | // If sizeof...(T) is zero, there shall be no member type. |
2234 | template<> | |
2235 | struct common_type<> | |
2236 | { }; | |
b3618b71 | 2237 | |
f61a12b3 JW |
2238 | // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>. |
2239 | template<typename _Tp0> | |
2240 | struct common_type<_Tp0> | |
2241 | : public common_type<_Tp0, _Tp0> | |
2242 | { }; | |
b3618b71 | 2243 | |
f61a12b3 JW |
2244 | // If sizeof...(T) is two, ... |
2245 | template<typename _Tp1, typename _Tp2, | |
391d5d2e | 2246 | typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>> |
f61a12b3 | 2247 | struct __common_type_impl |
b3618b71 | 2248 | { |
f61a12b3 JW |
2249 | // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false, |
2250 | // let C denote the same type, if any, as common_type_t<D1, D2>. | |
2251 | using type = common_type<_Dp1, _Dp2>; | |
b3618b71 DK |
2252 | }; |
2253 | ||
f61a12b3 JW |
2254 | template<typename _Tp1, typename _Tp2> |
2255 | struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2> | |
2256 | : private __do_common_type_impl | |
b3618b71 | 2257 | { |
f61a12b3 JW |
2258 | // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2259 | // denotes a valid type, let C denote that type. | |
2260 | using type = decltype(_S_test<_Tp1, _Tp2>(0)); | |
b3618b71 DK |
2261 | }; |
2262 | ||
f61a12b3 JW |
2263 | // If sizeof...(T) is two, ... |
2264 | template<typename _Tp1, typename _Tp2> | |
2265 | struct common_type<_Tp1, _Tp2> | |
2266 | : public __common_type_impl<_Tp1, _Tp2>::type | |
2267 | { }; | |
b3618b71 | 2268 | |
f61a12b3 JW |
2269 | template<typename...> |
2270 | struct __common_type_pack | |
373c726e JW |
2271 | { }; |
2272 | ||
f61a12b3 JW |
2273 | template<typename, typename, typename = void> |
2274 | struct __common_type_fold; | |
2275 | ||
2276 | // If sizeof...(T) is greater than two, ... | |
2277 | template<typename _Tp1, typename _Tp2, typename... _Rp> | |
2278 | struct common_type<_Tp1, _Tp2, _Rp...> | |
2279 | : public __common_type_fold<common_type<_Tp1, _Tp2>, | |
2280 | __common_type_pack<_Rp...>> | |
373c726e | 2281 | { }; |
cfa9a96b | 2282 | |
f61a12b3 JW |
2283 | // Let C denote the same type, if any, as common_type_t<T1, T2>. |
2284 | // If there is such a type C, type shall denote the same type, if any, | |
2285 | // as common_type_t<C, R...>. | |
2286 | template<typename _CTp, typename... _Rp> | |
2287 | struct __common_type_fold<_CTp, __common_type_pack<_Rp...>, | |
2288 | __void_t<typename _CTp::type>> | |
2289 | : public common_type<typename _CTp::type, _Rp...> | |
b3618b71 | 2290 | { }; |
cfa9a96b | 2291 | |
f61a12b3 JW |
2292 | // Otherwise, there shall be no member type. |
2293 | template<typename _CTp, typename _Rp> | |
2294 | struct __common_type_fold<_CTp, _Rp, void> | |
b3618b71 | 2295 | { }; |
7274deff | 2296 | |
3c26b759 JW |
2297 | template<typename _Tp, bool = is_enum<_Tp>::value> |
2298 | struct __underlying_type_impl | |
2299 | { | |
2300 | using type = __underlying_type(_Tp); | |
2301 | }; | |
2302 | ||
2303 | template<typename _Tp> | |
2304 | struct __underlying_type_impl<_Tp, false> | |
2305 | { }; | |
6963c3b9 | 2306 | /// @endcond |
3c26b759 | 2307 | |
13901e4b | 2308 | /// The underlying type of an enum. |
a47407f6 PC |
2309 | template<typename _Tp> |
2310 | struct underlying_type | |
3c26b759 JW |
2311 | : public __underlying_type_impl<_Tp> |
2312 | { }; | |
123c516a | 2313 | |
6963c3b9 | 2314 | /// @cond undocumented |
7274deff PC |
2315 | template<typename _Tp> |
2316 | struct __declval_protector | |
2317 | { | |
2318 | static const bool __stop = false; | |
7274deff | 2319 | }; |
6963c3b9 | 2320 | /// @endcond |
7274deff | 2321 | |
6963c3b9 JW |
2322 | /** Utility to simplify expressions used in unevaluated operands |
2323 | * @since C++11 | |
2324 | * @ingroup utilities | |
2325 | */ | |
7274deff | 2326 | template<typename _Tp> |
ec26ff5a | 2327 | auto declval() noexcept -> decltype(__declval<_Tp>(0)) |
7274deff PC |
2328 | { |
2329 | static_assert(__declval_protector<_Tp>::__stop, | |
2330 | "declval() must not be used!"); | |
ec26ff5a | 2331 | return __declval<_Tp>(0); |
7274deff | 2332 | } |
1041daba | 2333 | |
be7f7822 JW |
2334 | /// result_of |
2335 | template<typename _Signature> | |
0e5abeb0 | 2336 | struct result_of; |
be7f7822 | 2337 | |
c0ffa2ba | 2338 | // Sfinae-friendly result_of implementation: |
83ddb39f | 2339 | |
b8806796 | 2340 | #define __cpp_lib_result_of_sfinae 201210L |
a15f7cb8 | 2341 | |
6963c3b9 | 2342 | /// @cond undocumented |
93e95400 JW |
2343 | struct __invoke_memfun_ref { }; |
2344 | struct __invoke_memfun_deref { }; | |
2345 | struct __invoke_memobj_ref { }; | |
2346 | struct __invoke_memobj_deref { }; | |
2347 | struct __invoke_other { }; | |
2348 | ||
2349 | // Associate a tag type with a specialization of __success_type. | |
2350 | template<typename _Tp, typename _Tag> | |
2351 | struct __result_of_success : __success_type<_Tp> | |
2352 | { using __invoke_type = _Tag; }; | |
2353 | ||
83ddb39f DK |
2354 | // [func.require] paragraph 1 bullet 1: |
2355 | struct __result_of_memfun_ref_impl | |
2356 | { | |
2357 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2358 | static __result_of_success<decltype( |
83ddb39f | 2359 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2360 | ), __invoke_memfun_ref> _S_test(int); |
83ddb39f DK |
2361 | |
2362 | template<typename...> | |
2363 | static __failure_type _S_test(...); | |
2364 | }; | |
2365 | ||
2366 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2367 | struct __result_of_memfun_ref | |
2368 | : private __result_of_memfun_ref_impl | |
2369 | { | |
2370 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2371 | }; | |
2372 | ||
2373 | // [func.require] paragraph 1 bullet 2: | |
2374 | struct __result_of_memfun_deref_impl | |
2375 | { | |
2376 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2377 | static __result_of_success<decltype( |
83ddb39f | 2378 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2379 | ), __invoke_memfun_deref> _S_test(int); |
83ddb39f DK |
2380 | |
2381 | template<typename...> | |
2382 | static __failure_type _S_test(...); | |
2383 | }; | |
2384 | ||
2385 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2386 | struct __result_of_memfun_deref | |
2387 | : private __result_of_memfun_deref_impl | |
2388 | { | |
2389 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2390 | }; | |
2391 | ||
2392 | // [func.require] paragraph 1 bullet 3: | |
2393 | struct __result_of_memobj_ref_impl | |
2394 | { | |
2395 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2396 | static __result_of_success<decltype( |
83ddb39f | 2397 | std::declval<_Tp1>().*std::declval<_Fp>() |
93e95400 | 2398 | ), __invoke_memobj_ref> _S_test(int); |
83ddb39f DK |
2399 | |
2400 | template<typename, typename> | |
2401 | static __failure_type _S_test(...); | |
2402 | }; | |
2403 | ||
2404 | template<typename _MemPtr, typename _Arg> | |
2405 | struct __result_of_memobj_ref | |
2406 | : private __result_of_memobj_ref_impl | |
2407 | { | |
2408 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2409 | }; | |
2410 | ||
2411 | // [func.require] paragraph 1 bullet 4: | |
2412 | struct __result_of_memobj_deref_impl | |
2413 | { | |
2414 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2415 | static __result_of_success<decltype( |
83ddb39f | 2416 | (*std::declval<_Tp1>()).*std::declval<_Fp>() |
93e95400 | 2417 | ), __invoke_memobj_deref> _S_test(int); |
83ddb39f DK |
2418 | |
2419 | template<typename, typename> | |
2420 | static __failure_type _S_test(...); | |
2421 | }; | |
2422 | ||
be7f7822 | 2423 | template<typename _MemPtr, typename _Arg> |
83ddb39f DK |
2424 | struct __result_of_memobj_deref |
2425 | : private __result_of_memobj_deref_impl | |
2426 | { | |
2427 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2428 | }; | |
2429 | ||
2430 | template<typename _MemPtr, typename _Arg> | |
2431 | struct __result_of_memobj; | |
be7f7822 JW |
2432 | |
2433 | template<typename _Res, typename _Class, typename _Arg> | |
83ddb39f | 2434 | struct __result_of_memobj<_Res _Class::*, _Arg> |
be7f7822 | 2435 | { |
6791489e | 2436 | typedef __remove_cvref_t<_Arg> _Argval; |
83ddb39f | 2437 | typedef _Res _Class::* _MemPtr; |
a09bb4a8 | 2438 | typedef typename __conditional_t<__or_<is_same<_Argval, _Class>, |
83ddb39f DK |
2439 | is_base_of<_Class, _Argval>>::value, |
2440 | __result_of_memobj_ref<_MemPtr, _Arg>, | |
2441 | __result_of_memobj_deref<_MemPtr, _Arg> | |
a09bb4a8 | 2442 | >::type type; |
be7f7822 JW |
2443 | }; |
2444 | ||
83ddb39f DK |
2445 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2446 | struct __result_of_memfun; | |
be7f7822 JW |
2447 | |
2448 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
83ddb39f | 2449 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
be7f7822 | 2450 | { |
81c7cf71 | 2451 | typedef typename remove_reference<_Arg>::type _Argval; |
83ddb39f | 2452 | typedef _Res _Class::* _MemPtr; |
a09bb4a8 | 2453 | typedef typename __conditional_t<is_base_of<_Class, _Argval>::value, |
83ddb39f DK |
2454 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, |
2455 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> | |
a09bb4a8 | 2456 | >::type type; |
be7f7822 JW |
2457 | }; |
2458 | ||
93e95400 JW |
2459 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
2460 | // 2219. INVOKE-ing a pointer to member with a reference_wrapper | |
2461 | // as the object expression | |
93e95400 | 2462 | |
7dcc645c | 2463 | // Used by result_of, invoke etc. to unwrap a reference_wrapper. |
81c7cf71 | 2464 | template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>> |
7dcc645c JW |
2465 | struct __inv_unwrap |
2466 | { | |
2467 | using type = _Tp; | |
2468 | }; | |
f3d7dd52 | 2469 | |
7dcc645c JW |
2470 | template<typename _Tp, typename _Up> |
2471 | struct __inv_unwrap<_Tp, reference_wrapper<_Up>> | |
2472 | { | |
2473 | using type = _Up&; | |
2474 | }; | |
93e95400 | 2475 | |
be7f7822 | 2476 | template<bool, bool, typename _Functor, typename... _ArgTypes> |
83ddb39f | 2477 | struct __result_of_impl |
be7f7822 | 2478 | { |
83ddb39f | 2479 | typedef __failure_type type; |
be7f7822 JW |
2480 | }; |
2481 | ||
2482 | template<typename _MemPtr, typename _Arg> | |
83ddb39f | 2483 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
391d5d2e | 2484 | : public __result_of_memobj<__decay_t<_MemPtr>, |
7dcc645c | 2485 | typename __inv_unwrap<_Arg>::type> |
c4db9a77 | 2486 | { }; |
be7f7822 | 2487 | |
83ddb39f DK |
2488 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2489 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> | |
391d5d2e | 2490 | : public __result_of_memfun<__decay_t<_MemPtr>, |
7dcc645c | 2491 | typename __inv_unwrap<_Arg>::type, _Args...> |
c4db9a77 | 2492 | { }; |
be7f7822 | 2493 | |
83ddb39f DK |
2494 | // [func.require] paragraph 1 bullet 5: |
2495 | struct __result_of_other_impl | |
2496 | { | |
2497 | template<typename _Fn, typename... _Args> | |
93e95400 | 2498 | static __result_of_success<decltype( |
83ddb39f | 2499 | std::declval<_Fn>()(std::declval<_Args>()...) |
93e95400 | 2500 | ), __invoke_other> _S_test(int); |
83ddb39f DK |
2501 | |
2502 | template<typename...> | |
2503 | static __failure_type _S_test(...); | |
2504 | }; | |
2505 | ||
be7f7822 | 2506 | template<typename _Functor, typename... _ArgTypes> |
83ddb39f DK |
2507 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2508 | : private __result_of_other_impl | |
be7f7822 | 2509 | { |
83ddb39f | 2510 | typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
be7f7822 JW |
2511 | }; |
2512 | ||
7dcc645c | 2513 | // __invoke_result (std::invoke_result for C++11) |
83ddb39f | 2514 | template<typename _Functor, typename... _ArgTypes> |
7dcc645c | 2515 | struct __invoke_result |
83ddb39f DK |
2516 | : public __result_of_impl< |
2517 | is_member_object_pointer< | |
2518 | typename remove_reference<_Functor>::type | |
2519 | >::value, | |
2520 | is_member_function_pointer< | |
2521 | typename remove_reference<_Functor>::type | |
2522 | >::value, | |
7dcc645c | 2523 | _Functor, _ArgTypes... |
83ddb39f DK |
2524 | >::type |
2525 | { }; | |
6963c3b9 | 2526 | /// @endcond |
c0ffa2ba | 2527 | |
7dcc645c JW |
2528 | template<typename _Functor, typename... _ArgTypes> |
2529 | struct result_of<_Functor(_ArgTypes...)> | |
2530 | : public __invoke_result<_Functor, _ArgTypes...> | |
de196e5d | 2531 | { } _GLIBCXX17_DEPRECATED_SUGGEST("std::invoke_result"); |
7dcc645c | 2532 | |
e112d53a | 2533 | #if __cplusplus >= 201402L |
4457e88c JW |
2534 | /// Alias template for aligned_storage |
2535 | template<size_t _Len, size_t _Align = | |
2536 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2537 | using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; | |
2538 | ||
d3718027 RS |
2539 | template <size_t _Len, typename... _Types> |
2540 | using aligned_union_t = typename aligned_union<_Len, _Types...>::type; | |
2541 | ||
4457e88c JW |
2542 | /// Alias template for decay |
2543 | template<typename _Tp> | |
2544 | using decay_t = typename decay<_Tp>::type; | |
2545 | ||
2546 | /// Alias template for enable_if | |
2547 | template<bool _Cond, typename _Tp = void> | |
2548 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2549 | ||
2550 | /// Alias template for conditional | |
2551 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
2552 | using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type; | |
2553 | ||
2554 | /// Alias template for common_type | |
2555 | template<typename... _Tp> | |
2556 | using common_type_t = typename common_type<_Tp...>::type; | |
2557 | ||
2558 | /// Alias template for underlying_type | |
2559 | template<typename _Tp> | |
2560 | using underlying_type_t = typename underlying_type<_Tp>::type; | |
2561 | ||
2562 | /// Alias template for result_of | |
2563 | template<typename _Tp> | |
2564 | using result_of_t = typename result_of<_Tp>::type; | |
e112d53a JW |
2565 | #endif // C++14 |
2566 | ||
e112d53a | 2567 | #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11 |
b8806796 | 2568 | #define __cpp_lib_void_t 201411L |
bd1eb5e0 JW |
2569 | /// A metafunction that always yields void, used for detecting valid types. |
2570 | template<typename...> using void_t = void; | |
2571 | #endif | |
2572 | ||
6963c3b9 JW |
2573 | /// @cond undocumented |
2574 | ||
2b667beb JW |
2575 | // Detection idiom. |
2576 | // Detect whether _Op<_Args...> is a valid type, use default _Def if not. | |
2577 | ||
2578 | #if __cpp_concepts | |
2579 | // Implementation of the detection idiom (negative case). | |
2580 | template<typename _Def, template<typename...> class _Op, typename... _Args> | |
2581 | struct __detected_or | |
2582 | { | |
2583 | using type = _Def; | |
2584 | using __is_detected = false_type; | |
2585 | }; | |
2586 | ||
2587 | // Implementation of the detection idiom (positive case). | |
2588 | template<typename _Def, template<typename...> class _Op, typename... _Args> | |
2589 | requires requires { typename _Op<_Args...>; } | |
2590 | struct __detected_or<_Def, _Op, _Args...> | |
2591 | { | |
2592 | using type = _Op<_Args...>; | |
2593 | using __is_detected = true_type; | |
2594 | }; | |
2595 | #else | |
6af6bef4 JW |
2596 | /// Implementation of the detection idiom (negative case). |
2597 | template<typename _Default, typename _AlwaysVoid, | |
2598 | template<typename...> class _Op, typename... _Args> | |
2599 | struct __detector | |
2600 | { | |
6af6bef4 | 2601 | using type = _Default; |
2b667beb | 2602 | using __is_detected = false_type; |
6af6bef4 JW |
2603 | }; |
2604 | ||
2605 | /// Implementation of the detection idiom (positive case). | |
2606 | template<typename _Default, template<typename...> class _Op, | |
2607 | typename... _Args> | |
2608 | struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...> | |
2609 | { | |
6af6bef4 | 2610 | using type = _Op<_Args...>; |
2b667beb | 2611 | using __is_detected = true_type; |
6af6bef4 JW |
2612 | }; |
2613 | ||
6af6bef4 JW |
2614 | template<typename _Default, template<typename...> class _Op, |
2615 | typename... _Args> | |
2616 | using __detected_or = __detector<_Default, void, _Op, _Args...>; | |
2b667beb | 2617 | #endif // __cpp_concepts |
6af6bef4 JW |
2618 | |
2619 | // _Op<_Args...> if that is a valid type, otherwise _Default. | |
2620 | template<typename _Default, template<typename...> class _Op, | |
2621 | typename... _Args> | |
2622 | using __detected_or_t | |
2623 | = typename __detected_or<_Default, _Op, _Args...>::type; | |
2624 | ||
033b71ce PC |
2625 | /** |
2626 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
2627 | * member type _NTYPE. | |
2628 | */ | |
82b12c4b | 2629 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ |
847e9cf8 | 2630 | template<typename _Tp, typename = __void_t<>> \ |
82b12c4b | 2631 | struct __has_##_NTYPE \ |
847e9cf8 JW |
2632 | : false_type \ |
2633 | { }; \ | |
2634 | template<typename _Tp> \ | |
2635 | struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \ | |
2636 | : true_type \ | |
033b71ce PC |
2637 | { }; |
2638 | ||
26b5ace7 DK |
2639 | template <typename _Tp> |
2640 | struct __is_swappable; | |
ddb63209 | 2641 | |
26b5ace7 DK |
2642 | template <typename _Tp> |
2643 | struct __is_nothrow_swappable; | |
ddb63209 | 2644 | |
a2863bde VV |
2645 | template<typename> |
2646 | struct __is_tuple_like_impl : false_type | |
2647 | { }; | |
2648 | ||
a2863bde VV |
2649 | // Internal type trait that allows us to sfinae-protect tuple_cat. |
2650 | template<typename _Tp> | |
2651 | struct __is_tuple_like | |
6791489e | 2652 | : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type |
a2863bde | 2653 | { }; |
6963c3b9 | 2654 | /// @endcond |
a2863bde | 2655 | |
ddb63209 | 2656 | template<typename _Tp> |
7a91c710 | 2657 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2658 | inline |
391d5d2e JW |
2659 | _Require<__not_<__is_tuple_like<_Tp>>, |
2660 | is_move_constructible<_Tp>, | |
2661 | is_move_assignable<_Tp>> | |
ddb63209 VV |
2662 | swap(_Tp&, _Tp&) |
2663 | noexcept(__and_<is_nothrow_move_constructible<_Tp>, | |
2664 | is_nothrow_move_assignable<_Tp>>::value); | |
2665 | ||
2666 | template<typename _Tp, size_t _Nm> | |
7a91c710 | 2667 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2668 | inline |
391d5d2e | 2669 | __enable_if_t<__is_swappable<_Tp>::value> |
ddb63209 | 2670 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) |
26b5ace7 | 2671 | noexcept(__is_nothrow_swappable<_Tp>::value); |
ddb63209 | 2672 | |
6963c3b9 | 2673 | /// @cond undocumented |
26b5ace7 | 2674 | namespace __swappable_details { |
ddb63209 VV |
2675 | using std::swap; |
2676 | ||
26b5ace7 DK |
2677 | struct __do_is_swappable_impl |
2678 | { | |
2679 | template<typename _Tp, typename | |
2680 | = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))> | |
2681 | static true_type __test(int); | |
2682 | ||
2683 | template<typename> | |
2684 | static false_type __test(...); | |
2685 | }; | |
2686 | ||
2687 | struct __do_is_nothrow_swappable_impl | |
2688 | { | |
2689 | template<typename _Tp> | |
2690 | static __bool_constant< | |
2691 | noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>())) | |
2692 | > __test(int); | |
2693 | ||
2694 | template<typename> | |
2695 | static false_type __test(...); | |
2696 | }; | |
2697 | ||
6b9539e2 | 2698 | } // namespace __swappable_details |
ddb63209 | 2699 | |
26b5ace7 DK |
2700 | template<typename _Tp> |
2701 | struct __is_swappable_impl | |
2702 | : public __swappable_details::__do_is_swappable_impl | |
2703 | { | |
2704 | typedef decltype(__test<_Tp>(0)) type; | |
2705 | }; | |
2706 | ||
2707 | template<typename _Tp> | |
ddb63209 | 2708 | struct __is_nothrow_swappable_impl |
26b5ace7 DK |
2709 | : public __swappable_details::__do_is_nothrow_swappable_impl |
2710 | { | |
2711 | typedef decltype(__test<_Tp>(0)) type; | |
2712 | }; | |
ddb63209 | 2713 | |
26b5ace7 DK |
2714 | template<typename _Tp> |
2715 | struct __is_swappable | |
2716 | : public __is_swappable_impl<_Tp>::type | |
ddb63209 VV |
2717 | { }; |
2718 | ||
26b5ace7 | 2719 | template<typename _Tp> |
ddb63209 | 2720 | struct __is_nothrow_swappable |
26b5ace7 | 2721 | : public __is_nothrow_swappable_impl<_Tp>::type |
ddb63209 | 2722 | { }; |
6963c3b9 | 2723 | /// @endcond |
ddb63209 | 2724 | |
6b9539e2 | 2725 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
b8806796 | 2726 | #define __cpp_lib_is_swappable 201603L |
6b9539e2 DK |
2727 | /// Metafunctions used for detecting swappable types: p0185r1 |
2728 | ||
2729 | /// is_swappable | |
2730 | template<typename _Tp> | |
2731 | struct is_swappable | |
2732 | : public __is_swappable_impl<_Tp>::type | |
608a080c AP |
2733 | { |
2734 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2735 | "template argument must be a complete class or an unbounded array"); | |
2736 | }; | |
6b9539e2 DK |
2737 | |
2738 | /// is_nothrow_swappable | |
2739 | template<typename _Tp> | |
2740 | struct is_nothrow_swappable | |
2741 | : public __is_nothrow_swappable_impl<_Tp>::type | |
608a080c AP |
2742 | { |
2743 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2744 | "template argument must be a complete class or an unbounded array"); | |
2745 | }; | |
6b9539e2 DK |
2746 | |
2747 | #if __cplusplus >= 201402L | |
2748 | /// is_swappable_v | |
2749 | template<typename _Tp> | |
288695f7 DK |
2750 | _GLIBCXX17_INLINE constexpr bool is_swappable_v = |
2751 | is_swappable<_Tp>::value; | |
6b9539e2 DK |
2752 | |
2753 | /// is_nothrow_swappable_v | |
2754 | template<typename _Tp> | |
288695f7 DK |
2755 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v = |
2756 | is_nothrow_swappable<_Tp>::value; | |
6b9539e2 DK |
2757 | #endif // __cplusplus >= 201402L |
2758 | ||
6963c3b9 | 2759 | /// @cond undocumented |
6b9539e2 DK |
2760 | namespace __swappable_with_details { |
2761 | using std::swap; | |
2762 | ||
2763 | struct __do_is_swappable_with_impl | |
2764 | { | |
2765 | template<typename _Tp, typename _Up, typename | |
2766 | = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), | |
2767 | typename | |
2768 | = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> | |
2769 | static true_type __test(int); | |
2770 | ||
2771 | template<typename, typename> | |
2772 | static false_type __test(...); | |
2773 | }; | |
2774 | ||
2775 | struct __do_is_nothrow_swappable_with_impl | |
2776 | { | |
2777 | template<typename _Tp, typename _Up> | |
2778 | static __bool_constant< | |
2779 | noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) | |
2780 | && | |
2781 | noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())) | |
2782 | > __test(int); | |
2783 | ||
2784 | template<typename, typename> | |
2785 | static false_type __test(...); | |
2786 | }; | |
2787 | ||
2788 | } // namespace __swappable_with_details | |
2789 | ||
2790 | template<typename _Tp, typename _Up> | |
2791 | struct __is_swappable_with_impl | |
2792 | : public __swappable_with_details::__do_is_swappable_with_impl | |
2793 | { | |
2794 | typedef decltype(__test<_Tp, _Up>(0)) type; | |
2795 | }; | |
2796 | ||
2797 | // Optimization for the homogenous lvalue case, not required: | |
2798 | template<typename _Tp> | |
2799 | struct __is_swappable_with_impl<_Tp&, _Tp&> | |
2800 | : public __swappable_details::__do_is_swappable_impl | |
2801 | { | |
2802 | typedef decltype(__test<_Tp&>(0)) type; | |
2803 | }; | |
2804 | ||
2805 | template<typename _Tp, typename _Up> | |
2806 | struct __is_nothrow_swappable_with_impl | |
2807 | : public __swappable_with_details::__do_is_nothrow_swappable_with_impl | |
2808 | { | |
2809 | typedef decltype(__test<_Tp, _Up>(0)) type; | |
2810 | }; | |
2811 | ||
2812 | // Optimization for the homogenous lvalue case, not required: | |
2813 | template<typename _Tp> | |
2814 | struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&> | |
2815 | : public __swappable_details::__do_is_nothrow_swappable_impl | |
2816 | { | |
2817 | typedef decltype(__test<_Tp&>(0)) type; | |
2818 | }; | |
6963c3b9 | 2819 | /// @endcond |
6b9539e2 DK |
2820 | |
2821 | /// is_swappable_with | |
2822 | template<typename _Tp, typename _Up> | |
2823 | struct is_swappable_with | |
2824 | : public __is_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2825 | { |
2826 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2827 | "first template argument must be a complete class or an unbounded array"); | |
2828 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2829 | "second template argument must be a complete class or an unbounded array"); | |
2830 | }; | |
6b9539e2 DK |
2831 | |
2832 | /// is_nothrow_swappable_with | |
2833 | template<typename _Tp, typename _Up> | |
2834 | struct is_nothrow_swappable_with | |
2835 | : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2836 | { |
2837 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2838 | "first template argument must be a complete class or an unbounded array"); | |
2839 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2840 | "second template argument must be a complete class or an unbounded array"); | |
2841 | }; | |
6b9539e2 DK |
2842 | |
2843 | #if __cplusplus >= 201402L | |
2844 | /// is_swappable_with_v | |
2845 | template<typename _Tp, typename _Up> | |
288695f7 DK |
2846 | _GLIBCXX17_INLINE constexpr bool is_swappable_with_v = |
2847 | is_swappable_with<_Tp, _Up>::value; | |
6b9539e2 DK |
2848 | |
2849 | /// is_nothrow_swappable_with_v | |
2850 | template<typename _Tp, typename _Up> | |
288695f7 | 2851 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v = |
6b9539e2 DK |
2852 | is_nothrow_swappable_with<_Tp, _Up>::value; |
2853 | #endif // __cplusplus >= 201402L | |
137422c8 | 2854 | |
42183d03 JW |
2855 | #endif// c++1z or gnu++11 |
2856 | ||
6963c3b9 JW |
2857 | /// @cond undocumented |
2858 | ||
7dcc645c | 2859 | // __is_invocable (std::is_invocable for C++11) |
42183d03 | 2860 | |
d91f618d JW |
2861 | // The primary template is used for invalid INVOKE expressions. |
2862 | template<typename _Result, typename _Ret, | |
2863 | bool = is_void<_Ret>::value, typename = void> | |
71c828f8 JW |
2864 | struct __is_invocable_impl |
2865 | : false_type | |
2866 | { | |
fa9bda3e | 2867 | using __nothrow_conv = false_type; // For is_nothrow_invocable_r |
71c828f8 | 2868 | }; |
42183d03 | 2869 | |
d91f618d | 2870 | // Used for valid INVOKE and INVOKE<void> expressions. |
42183d03 | 2871 | template<typename _Result, typename _Ret> |
d91f618d JW |
2872 | struct __is_invocable_impl<_Result, _Ret, |
2873 | /* is_void<_Ret> = */ true, | |
2874 | __void_t<typename _Result::type>> | |
2875 | : true_type | |
71c828f8 | 2876 | { |
fa9bda3e | 2877 | using __nothrow_conv = true_type; // For is_nothrow_invocable_r |
71c828f8 | 2878 | }; |
42183d03 | 2879 | |
d91f618d JW |
2880 | #pragma GCC diagnostic push |
2881 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
2882 | // Used for INVOKE<R> expressions to check the implicit conversion to R. | |
2883 | template<typename _Result, typename _Ret> | |
2884 | struct __is_invocable_impl<_Result, _Ret, | |
2885 | /* is_void<_Ret> = */ false, | |
2886 | __void_t<typename _Result::type>> | |
2887 | { | |
2888 | private: | |
2889 | // The type of the INVOKE expression. | |
fa9bda3e JW |
2890 | using _Res_t = typename _Result::type; |
2891 | ||
71c828f8 JW |
2892 | // Unlike declval, this doesn't add_rvalue_reference, so it respects |
2893 | // guaranteed copy elision. | |
fa9bda3e | 2894 | static _Res_t _S_get() noexcept; |
d91f618d | 2895 | |
fa9bda3e | 2896 | // Used to check if _Res_t can implicitly convert to _Tp. |
d91f618d | 2897 | template<typename _Tp> |
fa9bda3e | 2898 | static void _S_conv(__type_identity_t<_Tp>) noexcept; |
d91f618d JW |
2899 | |
2900 | // This overload is viable if INVOKE(f, args...) can convert to _Tp. | |
fa9bda3e JW |
2901 | template<typename _Tp, |
2902 | bool _Nothrow = noexcept(_S_conv<_Tp>(_S_get())), | |
71c828f8 | 2903 | typename = decltype(_S_conv<_Tp>(_S_get())), |
fa9bda3e JW |
2904 | bool _Dangle = __reference_converts_from_temporary(_Tp, _Res_t)> |
2905 | static __bool_constant<_Nothrow && !_Dangle> | |
d91f618d JW |
2906 | _S_test(int); |
2907 | ||
71c828f8 | 2908 | template<typename _Tp, bool = false> |
d91f618d JW |
2909 | static false_type |
2910 | _S_test(...); | |
2911 | ||
2912 | public: | |
71c828f8 | 2913 | // For is_invocable_r |
fa9bda3e | 2914 | using type = decltype(_S_test<_Ret, /* Nothrow = */ true>(1)); |
71c828f8 JW |
2915 | |
2916 | // For is_nothrow_invocable_r | |
fa9bda3e | 2917 | using __nothrow_conv = decltype(_S_test<_Ret>(1)); |
d91f618d JW |
2918 | }; |
2919 | #pragma GCC diagnostic pop | |
2920 | ||
7dcc645c JW |
2921 | template<typename _Fn, typename... _ArgTypes> |
2922 | struct __is_invocable | |
2923 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
42183d03 JW |
2924 | { }; |
2925 | ||
42183d03 JW |
2926 | template<typename _Fn, typename _Tp, typename... _Args> |
2927 | constexpr bool __call_is_nt(__invoke_memfun_ref) | |
2928 | { | |
2929 | using _Up = typename __inv_unwrap<_Tp>::type; | |
2930 | return noexcept((std::declval<_Up>().*std::declval<_Fn>())( | |
2931 | std::declval<_Args>()...)); | |
2932 | } | |
2933 | ||
2934 | template<typename _Fn, typename _Tp, typename... _Args> | |
2935 | constexpr bool __call_is_nt(__invoke_memfun_deref) | |
2936 | { | |
2937 | return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())( | |
2938 | std::declval<_Args>()...)); | |
2939 | } | |
2940 | ||
2941 | template<typename _Fn, typename _Tp> | |
2942 | constexpr bool __call_is_nt(__invoke_memobj_ref) | |
2943 | { | |
2944 | using _Up = typename __inv_unwrap<_Tp>::type; | |
2945 | return noexcept(std::declval<_Up>().*std::declval<_Fn>()); | |
2946 | } | |
2947 | ||
2948 | template<typename _Fn, typename _Tp> | |
2949 | constexpr bool __call_is_nt(__invoke_memobj_deref) | |
2950 | { | |
2951 | return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>()); | |
2952 | } | |
2953 | ||
2954 | template<typename _Fn, typename... _Args> | |
2955 | constexpr bool __call_is_nt(__invoke_other) | |
2956 | { | |
2957 | return noexcept(std::declval<_Fn>()(std::declval<_Args>()...)); | |
2958 | } | |
2959 | ||
7dcc645c | 2960 | template<typename _Result, typename _Fn, typename... _Args> |
42183d03 JW |
2961 | struct __call_is_nothrow |
2962 | : __bool_constant< | |
7dcc645c JW |
2963 | std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{}) |
2964 | > | |
42183d03 JW |
2965 | { }; |
2966 | ||
7dcc645c JW |
2967 | template<typename _Fn, typename... _Args> |
2968 | using __call_is_nothrow_ | |
2969 | = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>; | |
42183d03 | 2970 | |
7dcc645c JW |
2971 | // __is_nothrow_invocable (std::is_nothrow_invocable for C++11) |
2972 | template<typename _Fn, typename... _Args> | |
2973 | struct __is_nothrow_invocable | |
2974 | : __and_<__is_invocable<_Fn, _Args...>, | |
2975 | __call_is_nothrow_<_Fn, _Args...>>::type | |
42183d03 JW |
2976 | { }; |
2977 | ||
cc28d234 JW |
2978 | #pragma GCC diagnostic push |
2979 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
a73d2fa8 NDR |
2980 | struct __nonesuchbase {}; |
2981 | struct __nonesuch : private __nonesuchbase { | |
f524d5b3 VV |
2982 | ~__nonesuch() = delete; |
2983 | __nonesuch(__nonesuch const&) = delete; | |
2984 | void operator=(__nonesuch const&) = delete; | |
2985 | }; | |
cc28d234 | 2986 | #pragma GCC diagnostic pop |
6963c3b9 | 2987 | /// @endcond |
f524d5b3 | 2988 | |
e641ee43 | 2989 | #if __cplusplus >= 201703L |
b8806796 | 2990 | # define __cpp_lib_is_invocable 201703L |
7dcc645c JW |
2991 | |
2992 | /// std::invoke_result | |
2993 | template<typename _Functor, typename... _ArgTypes> | |
2994 | struct invoke_result | |
2995 | : public __invoke_result<_Functor, _ArgTypes...> | |
69f571ff AP |
2996 | { |
2997 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}), | |
2998 | "_Functor must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
2999 | static_assert((std::__is_complete_or_unbounded( |
3000 | __type_identity<_ArgTypes>{}) && ...), | |
3001 | "each argument type must be a complete class or an unbounded array"); | |
69f571ff | 3002 | }; |
7dcc645c JW |
3003 | |
3004 | /// std::invoke_result_t | |
3005 | template<typename _Fn, typename... _Args> | |
3006 | using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; | |
42183d03 | 3007 | |
7dcc645c JW |
3008 | /// std::is_invocable |
3009 | template<typename _Fn, typename... _ArgTypes> | |
3010 | struct is_invocable | |
3011 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
608a080c AP |
3012 | { |
3013 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3014 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3015 | static_assert((std::__is_complete_or_unbounded( |
3016 | __type_identity<_ArgTypes>{}) && ...), | |
3017 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3018 | }; |
42183d03 | 3019 | |
7dcc645c JW |
3020 | /// std::is_invocable_r |
3021 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3022 | struct is_invocable_r | |
3023 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type | |
608a080c AP |
3024 | { |
3025 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3026 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3027 | static_assert((std::__is_complete_or_unbounded( |
3028 | __type_identity<_ArgTypes>{}) && ...), | |
3029 | "each argument type must be a complete class or an unbounded array"); | |
3030 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3031 | "_Ret must be a complete class or an unbounded array"); | |
608a080c | 3032 | }; |
42183d03 | 3033 | |
7dcc645c JW |
3034 | /// std::is_nothrow_invocable |
3035 | template<typename _Fn, typename... _ArgTypes> | |
3036 | struct is_nothrow_invocable | |
3037 | : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>, | |
608a080c AP |
3038 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
3039 | { | |
3040 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3041 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3042 | static_assert((std::__is_complete_or_unbounded( |
3043 | __type_identity<_ArgTypes>{}) && ...), | |
3044 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3045 | }; |
42183d03 | 3046 | |
6963c3b9 | 3047 | /// @cond undocumented |
fa9bda3e JW |
3048 | // This checks that the INVOKE<R> expression is well-formed and that the |
3049 | // conversion to R does not throw. It does *not* check whether the INVOKE | |
3050 | // expression itself can throw. That is done by __call_is_nothrow_ instead. | |
c4b06e7f | 3051 | template<typename _Result, typename _Ret> |
71c828f8 | 3052 | using __is_nt_invocable_impl |
fa9bda3e | 3053 | = typename __is_invocable_impl<_Result, _Ret>::__nothrow_conv; |
6963c3b9 | 3054 | /// @endcond |
c4b06e7f | 3055 | |
7dcc645c JW |
3056 | /// std::is_nothrow_invocable_r |
3057 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3058 | struct is_nothrow_invocable_r | |
c4b06e7f | 3059 | : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>, |
7dcc645c | 3060 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
69f571ff AP |
3061 | { |
3062 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3063 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3064 | static_assert((std::__is_complete_or_unbounded( |
3065 | __type_identity<_ArgTypes>{}) && ...), | |
3066 | "each argument type must be a complete class or an unbounded array"); | |
3067 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3068 | "_Ret must be a complete class or an unbounded array"); | |
69f571ff | 3069 | }; |
7dcc645c | 3070 | #endif // C++17 |
42183d03 | 3071 | |
e641ee43 | 3072 | #if __cplusplus >= 201703L |
068c8ac1 | 3073 | # define __cpp_lib_type_trait_variable_templates 201510L |
6963c3b9 | 3074 | /** |
da89dfc2 | 3075 | * @defgroup variable_templates Variable templates for type traits |
6963c3b9 JW |
3076 | * @ingroup metaprogramming |
3077 | * | |
da89dfc2 JW |
3078 | * Each variable `is_xxx_v<T>` is a boolean constant with the same value |
3079 | * as the `value` member of the corresponding type trait `is_xxx<T>`. | |
6963c3b9 | 3080 | * |
aba938d6 | 3081 | * @since C++17 unless noted otherwise. |
6963c3b9 JW |
3082 | */ |
3083 | ||
da89dfc2 | 3084 | /** |
6963c3b9 | 3085 | * @{ |
da89dfc2 | 3086 | * @ingroup variable_templates |
6963c3b9 | 3087 | */ |
137422c8 | 3088 | template <typename _Tp> |
288695f7 | 3089 | inline constexpr bool is_void_v = is_void<_Tp>::value; |
137422c8 | 3090 | template <typename _Tp> |
288695f7 | 3091 | inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; |
137422c8 | 3092 | template <typename _Tp> |
288695f7 | 3093 | inline constexpr bool is_integral_v = is_integral<_Tp>::value; |
137422c8 | 3094 | template <typename _Tp> |
288695f7 | 3095 | inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; |
0e1b1222 JW |
3096 | |
3097 | template <typename _Tp> | |
3098 | inline constexpr bool is_array_v = false; | |
137422c8 | 3099 | template <typename _Tp> |
0e1b1222 JW |
3100 | inline constexpr bool is_array_v<_Tp[]> = true; |
3101 | template <typename _Tp, size_t _Num> | |
3102 | inline constexpr bool is_array_v<_Tp[_Num]> = true; | |
3103 | ||
137422c8 | 3104 | template <typename _Tp> |
288695f7 | 3105 | inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; |
137422c8 | 3106 | template <typename _Tp> |
33005a4b | 3107 | inline constexpr bool is_lvalue_reference_v = false; |
137422c8 | 3108 | template <typename _Tp> |
33005a4b JW |
3109 | inline constexpr bool is_lvalue_reference_v<_Tp&> = true; |
3110 | template <typename _Tp> | |
3111 | inline constexpr bool is_rvalue_reference_v = false; | |
3112 | template <typename _Tp> | |
3113 | inline constexpr bool is_rvalue_reference_v<_Tp&&> = true; | |
137422c8 | 3114 | template <typename _Tp> |
288695f7 | 3115 | inline constexpr bool is_member_object_pointer_v = |
137422c8 VV |
3116 | is_member_object_pointer<_Tp>::value; |
3117 | template <typename _Tp> | |
288695f7 | 3118 | inline constexpr bool is_member_function_pointer_v = |
137422c8 VV |
3119 | is_member_function_pointer<_Tp>::value; |
3120 | template <typename _Tp> | |
cd20d948 | 3121 | inline constexpr bool is_enum_v = __is_enum(_Tp); |
137422c8 | 3122 | template <typename _Tp> |
cd20d948 | 3123 | inline constexpr bool is_union_v = __is_union(_Tp); |
137422c8 | 3124 | template <typename _Tp> |
cd20d948 | 3125 | inline constexpr bool is_class_v = __is_class(_Tp); |
137422c8 | 3126 | template <typename _Tp> |
288695f7 | 3127 | inline constexpr bool is_function_v = is_function<_Tp>::value; |
137422c8 | 3128 | template <typename _Tp> |
33005a4b JW |
3129 | inline constexpr bool is_reference_v = false; |
3130 | template <typename _Tp> | |
3131 | inline constexpr bool is_reference_v<_Tp&> = true; | |
3132 | template <typename _Tp> | |
3133 | inline constexpr bool is_reference_v<_Tp&&> = true; | |
137422c8 | 3134 | template <typename _Tp> |
288695f7 | 3135 | inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; |
137422c8 | 3136 | template <typename _Tp> |
288695f7 | 3137 | inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; |
137422c8 | 3138 | template <typename _Tp> |
288695f7 | 3139 | inline constexpr bool is_object_v = is_object<_Tp>::value; |
137422c8 | 3140 | template <typename _Tp> |
288695f7 | 3141 | inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; |
137422c8 | 3142 | template <typename _Tp> |
288695f7 | 3143 | inline constexpr bool is_compound_v = is_compound<_Tp>::value; |
137422c8 | 3144 | template <typename _Tp> |
288695f7 | 3145 | inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; |
137422c8 | 3146 | template <typename _Tp> |
33005a4b JW |
3147 | inline constexpr bool is_const_v = false; |
3148 | template <typename _Tp> | |
3149 | inline constexpr bool is_const_v<const _Tp> = true; | |
3150 | template <typename _Tp> | |
3151 | inline constexpr bool is_volatile_v = false; | |
137422c8 | 3152 | template <typename _Tp> |
33005a4b | 3153 | inline constexpr bool is_volatile_v<volatile _Tp> = true; |
7b3587b3 | 3154 | |
137422c8 | 3155 | template <typename _Tp> |
7b3587b3 | 3156 | inline constexpr bool is_trivial_v = __is_trivial(_Tp); |
137422c8 | 3157 | template <typename _Tp> |
7b3587b3 | 3158 | inline constexpr bool is_trivially_copyable_v = __is_trivially_copyable(_Tp); |
137422c8 | 3159 | template <typename _Tp> |
7b3587b3 | 3160 | inline constexpr bool is_standard_layout_v = __is_standard_layout(_Tp); |
137422c8 | 3161 | template <typename _Tp> |
1a6c5064 | 3162 | _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead") |
7b3587b3 | 3163 | inline constexpr bool is_pod_v = __is_pod(_Tp); |
137422c8 | 3164 | template <typename _Tp> |
24b54628 | 3165 | _GLIBCXX17_DEPRECATED |
7b3587b3 | 3166 | inline constexpr bool is_literal_type_v = __is_literal_type(_Tp); |
137422c8 | 3167 | template <typename _Tp> |
cd20d948 | 3168 | inline constexpr bool is_empty_v = __is_empty(_Tp); |
137422c8 | 3169 | template <typename _Tp> |
cd20d948 | 3170 | inline constexpr bool is_polymorphic_v = __is_polymorphic(_Tp); |
137422c8 | 3171 | template <typename _Tp> |
cd20d948 JW |
3172 | inline constexpr bool is_abstract_v = __is_abstract(_Tp); |
3173 | template <typename _Tp> | |
3174 | inline constexpr bool is_final_v = __is_final(_Tp); | |
7b3587b3 | 3175 | |
137422c8 | 3176 | template <typename _Tp> |
288695f7 | 3177 | inline constexpr bool is_signed_v = is_signed<_Tp>::value; |
137422c8 | 3178 | template <typename _Tp> |
288695f7 | 3179 | inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; |
45433832 | 3180 | |
137422c8 | 3181 | template <typename _Tp, typename... _Args> |
45433832 | 3182 | inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...); |
137422c8 | 3183 | template <typename _Tp> |
45433832 | 3184 | inline constexpr bool is_default_constructible_v = __is_constructible(_Tp); |
137422c8 | 3185 | template <typename _Tp> |
45433832 JW |
3186 | inline constexpr bool is_copy_constructible_v |
3187 | = __is_constructible(_Tp, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3188 | template <typename _Tp> |
45433832 JW |
3189 | inline constexpr bool is_move_constructible_v |
3190 | = __is_constructible(_Tp, __add_rval_ref_t<_Tp>); | |
3191 | ||
137422c8 | 3192 | template <typename _Tp, typename _Up> |
45433832 | 3193 | inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Up); |
137422c8 | 3194 | template <typename _Tp> |
45433832 JW |
3195 | inline constexpr bool is_copy_assignable_v |
3196 | = __is_assignable(__add_lval_ref_t<_Tp>, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3197 | template <typename _Tp> |
45433832 JW |
3198 | inline constexpr bool is_move_assignable_v |
3199 | = __is_assignable(__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>); | |
3200 | ||
137422c8 | 3201 | template <typename _Tp> |
288695f7 | 3202 | inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; |
45433832 | 3203 | |
137422c8 | 3204 | template <typename _Tp, typename... _Args> |
45433832 JW |
3205 | inline constexpr bool is_trivially_constructible_v |
3206 | = __is_trivially_constructible(_Tp, _Args...); | |
137422c8 | 3207 | template <typename _Tp> |
45433832 JW |
3208 | inline constexpr bool is_trivially_default_constructible_v |
3209 | = __is_trivially_constructible(_Tp); | |
137422c8 | 3210 | template <typename _Tp> |
45433832 JW |
3211 | inline constexpr bool is_trivially_copy_constructible_v |
3212 | = __is_trivially_constructible(_Tp, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3213 | template <typename _Tp> |
45433832 JW |
3214 | inline constexpr bool is_trivially_move_constructible_v |
3215 | = __is_trivially_constructible(_Tp, __add_rval_ref_t<_Tp>); | |
3216 | ||
137422c8 | 3217 | template <typename _Tp, typename _Up> |
45433832 JW |
3218 | inline constexpr bool is_trivially_assignable_v |
3219 | = __is_trivially_assignable(_Tp, _Up); | |
137422c8 | 3220 | template <typename _Tp> |
45433832 JW |
3221 | inline constexpr bool is_trivially_copy_assignable_v |
3222 | = __is_trivially_assignable(__add_lval_ref_t<_Tp>, | |
3223 | __add_lval_ref_t<const _Tp>); | |
137422c8 | 3224 | template <typename _Tp> |
45433832 JW |
3225 | inline constexpr bool is_trivially_move_assignable_v |
3226 | = __is_trivially_assignable(__add_lval_ref_t<_Tp>, | |
3227 | __add_rval_ref_t<_Tp>); | |
137422c8 | 3228 | template <typename _Tp> |
288695f7 | 3229 | inline constexpr bool is_trivially_destructible_v = |
137422c8 VV |
3230 | is_trivially_destructible<_Tp>::value; |
3231 | template <typename _Tp, typename... _Args> | |
45433832 JW |
3232 | inline constexpr bool is_nothrow_constructible_v |
3233 | = __is_nothrow_constructible(_Tp, _Args...); | |
137422c8 | 3234 | template <typename _Tp> |
45433832 JW |
3235 | inline constexpr bool is_nothrow_default_constructible_v |
3236 | = __is_nothrow_constructible(_Tp); | |
137422c8 | 3237 | template <typename _Tp> |
45433832 JW |
3238 | inline constexpr bool is_nothrow_copy_constructible_v |
3239 | = __is_nothrow_constructible(_Tp, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3240 | template <typename _Tp> |
45433832 JW |
3241 | inline constexpr bool is_nothrow_move_constructible_v |
3242 | = __is_nothrow_constructible(_Tp, __add_rval_ref_t<_Tp>); | |
3243 | ||
137422c8 | 3244 | template <typename _Tp, typename _Up> |
45433832 JW |
3245 | inline constexpr bool is_nothrow_assignable_v |
3246 | = __is_nothrow_assignable(_Tp, _Up); | |
137422c8 | 3247 | template <typename _Tp> |
45433832 JW |
3248 | inline constexpr bool is_nothrow_copy_assignable_v |
3249 | = __is_nothrow_assignable(__add_lval_ref_t<_Tp>, | |
3250 | __add_lval_ref_t<const _Tp>); | |
137422c8 | 3251 | template <typename _Tp> |
45433832 JW |
3252 | inline constexpr bool is_nothrow_move_assignable_v |
3253 | = __is_nothrow_assignable(__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>); | |
3254 | ||
137422c8 | 3255 | template <typename _Tp> |
288695f7 | 3256 | inline constexpr bool is_nothrow_destructible_v = |
137422c8 | 3257 | is_nothrow_destructible<_Tp>::value; |
7b3587b3 | 3258 | |
137422c8 | 3259 | template <typename _Tp> |
7b3587b3 JW |
3260 | inline constexpr bool has_virtual_destructor_v |
3261 | = __has_virtual_destructor(_Tp); | |
3262 | ||
137422c8 | 3263 | template <typename _Tp> |
288695f7 | 3264 | inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; |
0e1b1222 JW |
3265 | |
3266 | template <typename _Tp> | |
3267 | inline constexpr size_t rank_v = 0; | |
3268 | template <typename _Tp, size_t _Size> | |
3269 | inline constexpr size_t rank_v<_Tp[_Size]> = 1 + rank_v<_Tp>; | |
137422c8 | 3270 | template <typename _Tp> |
0e1b1222 JW |
3271 | inline constexpr size_t rank_v<_Tp[]> = 1 + rank_v<_Tp>; |
3272 | ||
137422c8 | 3273 | template <typename _Tp, unsigned _Idx = 0> |
0e1b1222 JW |
3274 | inline constexpr size_t extent_v = 0; |
3275 | template <typename _Tp, size_t _Size> | |
3276 | inline constexpr size_t extent_v<_Tp[_Size], 0> = _Size; | |
3277 | template <typename _Tp, unsigned _Idx, size_t _Size> | |
3278 | inline constexpr size_t extent_v<_Tp[_Size], _Idx> = extent_v<_Tp, _Idx - 1>; | |
3279 | template <typename _Tp> | |
3280 | inline constexpr size_t extent_v<_Tp[], 0> = 0; | |
3281 | template <typename _Tp, unsigned _Idx> | |
3282 | inline constexpr size_t extent_v<_Tp[], _Idx> = extent_v<_Tp, _Idx - 1>; | |
3283 | ||
73ae6eb5 | 3284 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
137422c8 | 3285 | template <typename _Tp, typename _Up> |
73ae6eb5 | 3286 | inline constexpr bool is_same_v = __is_same(_Tp, _Up); |
44af818f JW |
3287 | #else |
3288 | template <typename _Tp, typename _Up> | |
7b3587b3 JW |
3289 | inline constexpr bool is_same_v = false; |
3290 | template <typename _Tp> | |
3291 | inline constexpr bool is_same_v<_Tp, _Tp> = true; | |
44af818f | 3292 | #endif |
137422c8 | 3293 | template <typename _Base, typename _Derived> |
cd20d948 | 3294 | inline constexpr bool is_base_of_v = __is_base_of(_Base, _Derived); |
137422c8 | 3295 | template <typename _From, typename _To> |
af85ad89 | 3296 | inline constexpr bool is_convertible_v = __is_convertible(_From, _To); |
6963c3b9 JW |
3297 | template<typename _Fn, typename... _Args> |
3298 | inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; | |
3299 | template<typename _Fn, typename... _Args> | |
3300 | inline constexpr bool is_nothrow_invocable_v | |
3301 | = is_nothrow_invocable<_Fn, _Args...>::value; | |
3302 | template<typename _Ret, typename _Fn, typename... _Args> | |
3303 | inline constexpr bool is_invocable_r_v | |
3304 | = is_invocable_r<_Ret, _Fn, _Args...>::value; | |
3305 | template<typename _Ret, typename _Fn, typename... _Args> | |
3306 | inline constexpr bool is_nothrow_invocable_r_v | |
3307 | = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; | |
3308 | /// @} | |
873c7d5a | 3309 | |
2d763763 | 3310 | #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP |
b8806796 | 3311 | # define __cpp_lib_has_unique_object_representations 201606L |
873c7d5a | 3312 | /// has_unique_object_representations |
aba938d6 | 3313 | /// @since C++17 |
873c7d5a JW |
3314 | template<typename _Tp> |
3315 | struct has_unique_object_representations | |
3316 | : bool_constant<__has_unique_object_representations( | |
3317 | remove_cv_t<remove_all_extents_t<_Tp>> | |
3318 | )> | |
608a080c AP |
3319 | { |
3320 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
3321 | "template argument must be a complete class or an unbounded array"); | |
3322 | }; | |
b0e63d94 | 3323 | |
6963c3b9 | 3324 | /// @ingroup variable_templates |
b0e63d94 JW |
3325 | template<typename _Tp> |
3326 | inline constexpr bool has_unique_object_representations_v | |
3327 | = has_unique_object_representations<_Tp>::value; | |
1f5700e9 | 3328 | #endif |
e2ac6765 | 3329 | |
afa56c17 | 3330 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE |
b8806796 | 3331 | # define __cpp_lib_is_aggregate 201703L |
cd20d948 | 3332 | /// is_aggregate - true if the type is an aggregate. |
aba938d6 | 3333 | /// @since C++17 |
e2ac6765 VV |
3334 | template<typename _Tp> |
3335 | struct is_aggregate | |
608a080c | 3336 | : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> |
209ee624 | 3337 | { }; |
e2ac6765 | 3338 | |
cd20d948 JW |
3339 | /** is_aggregate_v - true if the type is an aggregate. |
3340 | * @ingroup variable_templates | |
3341 | * @since C++17 | |
3342 | */ | |
e2ac6765 | 3343 | template<typename _Tp> |
cd20d948 | 3344 | inline constexpr bool is_aggregate_v = __is_aggregate(remove_cv_t<_Tp>); |
e2ac6765 | 3345 | #endif |
137422c8 | 3346 | #endif // C++17 |
6b9539e2 | 3347 | |
aba938d6 JW |
3348 | #if __cplusplus >= 202002L |
3349 | ||
3350 | /** * Remove references and cv-qualifiers. | |
3351 | * @since C++20 | |
3352 | * @{ | |
3353 | */ | |
56772f62 JW |
3354 | #define __cpp_lib_remove_cvref 201711L |
3355 | ||
6791489e JW |
3356 | template<typename _Tp> |
3357 | struct remove_cvref | |
0e79e630 JW |
3358 | : remove_cv<_Tp> |
3359 | { }; | |
3360 | ||
3361 | template<typename _Tp> | |
3362 | struct remove_cvref<_Tp&> | |
3363 | : remove_cv<_Tp> | |
3364 | { }; | |
3365 | ||
3366 | template<typename _Tp> | |
3367 | struct remove_cvref<_Tp&&> | |
3368 | : remove_cv<_Tp> | |
3369 | { }; | |
6791489e JW |
3370 | |
3371 | template<typename _Tp> | |
0e79e630 | 3372 | using remove_cvref_t = typename remove_cvref<_Tp>::type; |
aba938d6 | 3373 | /// @} |
6791489e | 3374 | |
aba938d6 JW |
3375 | /** * Identity metafunction. |
3376 | * @since C++20 | |
3377 | * @{ | |
3378 | */ | |
56772f62 | 3379 | #define __cpp_lib_type_identity 201806L |
ee896276 JW |
3380 | template<typename _Tp> |
3381 | struct type_identity { using type = _Tp; }; | |
3382 | ||
3383 | template<typename _Tp> | |
3384 | using type_identity_t = typename type_identity<_Tp>::type; | |
aba938d6 | 3385 | /// @} |
ee896276 | 3386 | |
bb54e0b8 JW |
3387 | #define __cpp_lib_unwrap_ref 201811L |
3388 | ||
aba938d6 JW |
3389 | /** Unwrap a reference_wrapper |
3390 | * @since C++20 | |
3391 | * @{ | |
3392 | */ | |
3d18dc9d JW |
3393 | template<typename _Tp> |
3394 | struct unwrap_reference { using type = _Tp; }; | |
3395 | ||
3396 | template<typename _Tp> | |
3397 | struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; }; | |
3398 | ||
82e8c3da JW |
3399 | template<typename _Tp> |
3400 | using unwrap_reference_t = typename unwrap_reference<_Tp>::type; | |
aba938d6 | 3401 | /// @} |
82e8c3da | 3402 | |
aba938d6 JW |
3403 | /** Decay type and if it's a reference_wrapper, unwrap it |
3404 | * @since C++20 | |
3405 | * @{ | |
3406 | */ | |
3d18dc9d | 3407 | template<typename _Tp> |
82e8c3da | 3408 | struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; }; |
3d18dc9d JW |
3409 | |
3410 | template<typename _Tp> | |
3411 | using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type; | |
aba938d6 | 3412 | /// @} |
3d18dc9d | 3413 | |
46610940 JW |
3414 | #define __cpp_lib_bounded_array_traits 201902L |
3415 | ||
28d85efb | 3416 | /// True for a type that is an array of known bound. |
0e1b1222 | 3417 | /// @ingroup variable_templates |
aba938d6 | 3418 | /// @since C++20 |
28d85efb | 3419 | template<typename _Tp> |
0e1b1222 JW |
3420 | inline constexpr bool is_bounded_array_v = false; |
3421 | ||
3422 | template<typename _Tp, size_t _Size> | |
3423 | inline constexpr bool is_bounded_array_v<_Tp[_Size]> = true; | |
28d85efb JW |
3424 | |
3425 | /// True for a type that is an array of unknown bound. | |
0e1b1222 | 3426 | /// @ingroup variable_templates |
aba938d6 | 3427 | /// @since C++20 |
28d85efb | 3428 | template<typename _Tp> |
0e1b1222 | 3429 | inline constexpr bool is_unbounded_array_v = false; |
28d85efb | 3430 | |
0e1b1222 JW |
3431 | template<typename _Tp> |
3432 | inline constexpr bool is_unbounded_array_v<_Tp[]> = true; | |
3433 | ||
3434 | /// True for a type that is an array of known bound. | |
aba938d6 | 3435 | /// @since C++20 |
28d85efb | 3436 | template<typename _Tp> |
0e1b1222 JW |
3437 | struct is_bounded_array |
3438 | : public bool_constant<is_bounded_array_v<_Tp>> | |
3439 | { }; | |
28d85efb | 3440 | |
0e1b1222 | 3441 | /// True for a type that is an array of unknown bound. |
aba938d6 | 3442 | /// @since C++20 |
28d85efb | 3443 | template<typename _Tp> |
0e1b1222 JW |
3444 | struct is_unbounded_array |
3445 | : public bool_constant<is_unbounded_array_v<_Tp>> | |
3446 | { }; | |
28d85efb | 3447 | |
037ef219 JW |
3448 | #if __has_builtin(__is_layout_compatible) |
3449 | ||
3450 | /// @since C++20 | |
3451 | template<typename _Tp, typename _Up> | |
3452 | struct is_layout_compatible | |
3453 | : bool_constant<__is_layout_compatible(_Tp, _Up)> | |
3454 | { }; | |
3455 | ||
3456 | /// @ingroup variable_templates | |
3457 | /// @since C++20 | |
3458 | template<typename _Tp, typename _Up> | |
3459 | constexpr bool is_layout_compatible_v | |
3460 | = __is_layout_compatible(_Tp, _Up); | |
3461 | ||
3462 | #if __has_builtin(__builtin_is_corresponding_member) | |
3463 | #define __cpp_lib_is_layout_compatible 201907L | |
3464 | ||
3465 | /// @since C++20 | |
3466 | template<typename _S1, typename _S2, typename _M1, typename _M2> | |
3467 | constexpr bool | |
3468 | is_corresponding_member(_M1 _S1::*__m1, _M2 _S2::*__m2) noexcept | |
3469 | { return __builtin_is_corresponding_member(__m1, __m2); } | |
3470 | #endif | |
3471 | #endif | |
3472 | ||
4fa6c0ec JW |
3473 | #if __has_builtin(__is_pointer_interconvertible_base_of) |
3474 | /// True if `_Derived` is standard-layout and has a base class of type `_Base` | |
3475 | /// @since C++20 | |
3476 | template<typename _Base, typename _Derived> | |
3477 | struct is_pointer_interconvertible_base_of | |
3478 | : bool_constant<__is_pointer_interconvertible_base_of(_Base, _Derived)> | |
3479 | { }; | |
3480 | ||
3481 | /// @ingroup variable_templates | |
3482 | /// @since C++20 | |
3483 | template<typename _Base, typename _Derived> | |
3484 | constexpr bool is_pointer_interconvertible_base_of_v | |
3485 | = __is_pointer_interconvertible_base_of(_Base, _Derived); | |
3486 | ||
3487 | #if __has_builtin(__builtin_is_pointer_interconvertible_with_class) | |
3488 | #define __cpp_lib_is_pointer_interconvertible 201907L | |
3489 | ||
3490 | /// True if `__mp` points to the first member of a standard-layout type | |
3491 | /// @returns true if `s.*__mp` is pointer-interconvertible with `s` | |
3492 | /// @since C++20 | |
3493 | template<typename _Tp, typename _Mem> | |
3494 | constexpr bool | |
3495 | is_pointer_interconvertible_with_class(_Mem _Tp::*__mp) noexcept | |
3496 | { return __builtin_is_pointer_interconvertible_with_class(__mp); } | |
3497 | #endif | |
3498 | #endif | |
3499 | ||
b8ecdc77 JW |
3500 | #if __cplusplus > 202002L |
3501 | #define __cpp_lib_is_scoped_enum 202011L | |
3502 | ||
aba938d6 | 3503 | /// True if the type is a scoped enumeration type. |
6963c3b9 | 3504 | /// @since C++23 |
6963c3b9 | 3505 | |
b8ecdc77 JW |
3506 | template<typename _Tp> |
3507 | struct is_scoped_enum | |
3508 | : false_type | |
3509 | { }; | |
3510 | ||
43ab1dc2 JW |
3511 | template<typename _Tp> |
3512 | requires __is_enum(_Tp) | |
37ff51a9 | 3513 | && requires(remove_cv_t<_Tp> __t) { __t = __t; } // fails if incomplete |
b8ecdc77 | 3514 | struct is_scoped_enum<_Tp> |
43ab1dc2 JW |
3515 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> |
3516 | { }; | |
3517 | ||
aba938d6 JW |
3518 | /// @ingroup variable_templates |
3519 | /// @since C++23 | |
b8ecdc77 JW |
3520 | template<typename _Tp> |
3521 | inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; | |
aba938d6 | 3522 | |
465802c0 JW |
3523 | #if __has_builtin(__reference_constructs_from_temporary) \ |
3524 | && __has_builtin(__reference_converts_from_temporary) | |
3525 | ||
9a15d3be MP |
3526 | #define __cpp_lib_reference_from_temporary 202202L |
3527 | ||
3528 | /// True if _Tp is a reference type, a _Up value can be bound to _Tp in | |
3529 | /// direct-initialization, and a temporary object would be bound to | |
3530 | /// the reference, false otherwise. | |
3531 | /// @since C++23 | |
3532 | template<typename _Tp, typename _Up> | |
3533 | struct reference_constructs_from_temporary | |
3534 | : public bool_constant<__reference_constructs_from_temporary(_Tp, _Up)> | |
3535 | { | |
3536 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}) | |
3537 | && std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
3538 | "template argument must be a complete class or an unbounded array"); | |
3539 | }; | |
3540 | ||
3541 | /// True if _Tp is a reference type, a _Up value can be bound to _Tp in | |
3542 | /// copy-initialization, and a temporary object would be bound to | |
3543 | /// the reference, false otherwise. | |
3544 | /// @since C++23 | |
3545 | template<typename _Tp, typename _Up> | |
3546 | struct reference_converts_from_temporary | |
3547 | : public bool_constant<__reference_converts_from_temporary(_Tp, _Up)> | |
3548 | { | |
3549 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}) | |
3550 | && std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
3551 | "template argument must be a complete class or an unbounded array"); | |
3552 | }; | |
3553 | ||
3554 | /// @ingroup variable_templates | |
3555 | /// @since C++23 | |
3556 | template<typename _Tp, typename _Up> | |
3557 | inline constexpr bool reference_constructs_from_temporary_v | |
3558 | = reference_constructs_from_temporary<_Tp, _Up>::value; | |
3559 | ||
3560 | /// @ingroup variable_templates | |
3561 | /// @since C++23 | |
3562 | template<typename _Tp, typename _Up> | |
3563 | inline constexpr bool reference_converts_from_temporary_v | |
3564 | = reference_converts_from_temporary<_Tp, _Up>::value; | |
465802c0 | 3565 | #endif // __has_builtin for reference_from_temporary |
b8ecdc77 JW |
3566 | #endif // C++23 |
3567 | ||
74d14778 | 3568 | #if _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED |
8aa1550e | 3569 | #define __cpp_lib_is_constant_evaluated 201811L |
134a6f7b | 3570 | |
6963c3b9 | 3571 | /// Returns true only when called during constant evaluation. |
aba938d6 | 3572 | /// @since C++20 |
0d7924f2 JJ |
3573 | constexpr inline bool |
3574 | is_constant_evaluated() noexcept | |
74d14778 JW |
3575 | { |
3576 | #if __cpp_if_consteval >= 202106L | |
3577 | if consteval { return true; } else { return false; } | |
3578 | #else | |
3579 | return __builtin_is_constant_evaluated(); | |
3580 | #endif | |
3581 | } | |
0d7924f2 JJ |
3582 | #endif |
3583 | ||
6963c3b9 | 3584 | /// @cond undocumented |
0f8b14ee JW |
3585 | template<typename _From, typename _To> |
3586 | using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type; | |
3587 | ||
3588 | template<typename _Xp, typename _Yp> | |
3589 | using __cond_res | |
3590 | = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); | |
3591 | ||
3592 | template<typename _Ap, typename _Bp, typename = void> | |
3593 | struct __common_ref_impl | |
3594 | { }; | |
3595 | ||
3596 | // [meta.trans.other], COMMON-REF(A, B) | |
3597 | template<typename _Ap, typename _Bp> | |
3598 | using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type; | |
3599 | ||
c37b5ddc JW |
3600 | // COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &) |
3601 | template<typename _Xp, typename _Yp> | |
3602 | using __condres_cvref | |
3603 | = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; | |
3604 | ||
0f8b14ee JW |
3605 | // If A and B are both lvalue reference types, ... |
3606 | template<typename _Xp, typename _Yp> | |
c37b5ddc JW |
3607 | struct __common_ref_impl<_Xp&, _Yp&, __void_t<__condres_cvref<_Xp, _Yp>>> |
3608 | : enable_if<is_reference_v<__condres_cvref<_Xp, _Yp>>, | |
3609 | __condres_cvref<_Xp, _Yp>> | |
3610 | { }; | |
0f8b14ee JW |
3611 | |
3612 | // let C be remove_reference_t<COMMON-REF(X&, Y&)>&& | |
3613 | template<typename _Xp, typename _Yp> | |
3614 | using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&; | |
3615 | ||
3616 | // If A and B are both rvalue reference types, ... | |
3617 | template<typename _Xp, typename _Yp> | |
3618 | struct __common_ref_impl<_Xp&&, _Yp&&, | |
3619 | _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>, | |
3620 | is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>> | |
3621 | { using type = __common_ref_C<_Xp, _Yp>; }; | |
3622 | ||
3623 | // let D be COMMON-REF(const X&, Y&) | |
3624 | template<typename _Xp, typename _Yp> | |
3625 | using __common_ref_D = __common_ref<const _Xp&, _Yp&>; | |
3626 | ||
3627 | // If A is an rvalue reference and B is an lvalue reference, ... | |
3628 | template<typename _Xp, typename _Yp> | |
3629 | struct __common_ref_impl<_Xp&&, _Yp&, | |
3630 | _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>> | |
3631 | { using type = __common_ref_D<_Xp, _Yp>; }; | |
3632 | ||
3633 | // If A is an lvalue reference and B is an rvalue reference, ... | |
3634 | template<typename _Xp, typename _Yp> | |
3635 | struct __common_ref_impl<_Xp&, _Yp&&> | |
3636 | : __common_ref_impl<_Yp&&, _Xp&> | |
3637 | { }; | |
6963c3b9 | 3638 | /// @endcond |
0f8b14ee JW |
3639 | |
3640 | template<typename _Tp, typename _Up, | |
3641 | template<typename> class _TQual, template<typename> class _UQual> | |
3642 | struct basic_common_reference | |
3643 | { }; | |
3644 | ||
6963c3b9 | 3645 | /// @cond undocumented |
0f8b14ee JW |
3646 | template<typename _Tp> |
3647 | struct __xref | |
3648 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; }; | |
3649 | ||
3650 | template<typename _Tp> | |
3651 | struct __xref<_Tp&> | |
3652 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&; }; | |
3653 | ||
3654 | template<typename _Tp> | |
3655 | struct __xref<_Tp&&> | |
3656 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&&; }; | |
3657 | ||
3658 | template<typename _Tp1, typename _Tp2> | |
3659 | using __basic_common_ref | |
3660 | = typename basic_common_reference<remove_cvref_t<_Tp1>, | |
3661 | remove_cvref_t<_Tp2>, | |
3662 | __xref<_Tp1>::template __type, | |
3663 | __xref<_Tp2>::template __type>::type; | |
6963c3b9 | 3664 | /// @endcond |
0f8b14ee JW |
3665 | |
3666 | template<typename... _Tp> | |
3667 | struct common_reference; | |
3668 | ||
3669 | template<typename... _Tp> | |
3670 | using common_reference_t = typename common_reference<_Tp...>::type; | |
3671 | ||
3672 | // If sizeof...(T) is zero, there shall be no member type. | |
3673 | template<> | |
3674 | struct common_reference<> | |
3675 | { }; | |
3676 | ||
3677 | // If sizeof...(T) is one ... | |
3678 | template<typename _Tp0> | |
3679 | struct common_reference<_Tp0> | |
3680 | { using type = _Tp0; }; | |
3681 | ||
6963c3b9 | 3682 | /// @cond undocumented |
0f8b14ee JW |
3683 | template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void> |
3684 | struct __common_reference_impl | |
3685 | : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1> | |
3686 | { }; | |
3687 | ||
3688 | // If sizeof...(T) is two ... | |
3689 | template<typename _Tp1, typename _Tp2> | |
3690 | struct common_reference<_Tp1, _Tp2> | |
3691 | : __common_reference_impl<_Tp1, _Tp2> | |
3692 | { }; | |
3693 | ||
3694 | // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ... | |
3695 | template<typename _Tp1, typename _Tp2> | |
3696 | struct __common_reference_impl<_Tp1&, _Tp2&, 1, | |
3697 | void_t<__common_ref<_Tp1&, _Tp2&>>> | |
3698 | { using type = __common_ref<_Tp1&, _Tp2&>; }; | |
3699 | ||
3700 | template<typename _Tp1, typename _Tp2> | |
3701 | struct __common_reference_impl<_Tp1&&, _Tp2&&, 1, | |
3702 | void_t<__common_ref<_Tp1&&, _Tp2&&>>> | |
3703 | { using type = __common_ref<_Tp1&&, _Tp2&&>; }; | |
3704 | ||
3705 | template<typename _Tp1, typename _Tp2> | |
3706 | struct __common_reference_impl<_Tp1&, _Tp2&&, 1, | |
3707 | void_t<__common_ref<_Tp1&, _Tp2&&>>> | |
3708 | { using type = __common_ref<_Tp1&, _Tp2&&>; }; | |
3709 | ||
3710 | template<typename _Tp1, typename _Tp2> | |
3711 | struct __common_reference_impl<_Tp1&&, _Tp2&, 1, | |
3712 | void_t<__common_ref<_Tp1&&, _Tp2&>>> | |
3713 | { using type = __common_ref<_Tp1&&, _Tp2&>; }; | |
3714 | ||
3715 | // Otherwise, if basic_common_reference<...>::type is well-formed, ... | |
3716 | template<typename _Tp1, typename _Tp2> | |
3717 | struct __common_reference_impl<_Tp1, _Tp2, 2, | |
3718 | void_t<__basic_common_ref<_Tp1, _Tp2>>> | |
3719 | { using type = __basic_common_ref<_Tp1, _Tp2>; }; | |
3720 | ||
3721 | // Otherwise, if COND-RES(T1, T2) is well-formed, ... | |
3722 | template<typename _Tp1, typename _Tp2> | |
3723 | struct __common_reference_impl<_Tp1, _Tp2, 3, | |
3724 | void_t<__cond_res<_Tp1, _Tp2>>> | |
3725 | { using type = __cond_res<_Tp1, _Tp2>; }; | |
3726 | ||
3727 | // Otherwise, if common_type_t<T1, T2> is well-formed, ... | |
3728 | template<typename _Tp1, typename _Tp2> | |
3729 | struct __common_reference_impl<_Tp1, _Tp2, 4, | |
3730 | void_t<common_type_t<_Tp1, _Tp2>>> | |
3731 | { using type = common_type_t<_Tp1, _Tp2>; }; | |
3732 | ||
3733 | // Otherwise, there shall be no member type. | |
3734 | template<typename _Tp1, typename _Tp2> | |
3735 | struct __common_reference_impl<_Tp1, _Tp2, 5, void> | |
3736 | { }; | |
3737 | ||
3738 | // Otherwise, if sizeof...(T) is greater than two, ... | |
3739 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3740 | struct common_reference<_Tp1, _Tp2, _Rest...> | |
3741 | : __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3742 | __common_type_pack<_Rest...>> | |
3743 | { }; | |
3744 | ||
3745 | // Reuse __common_type_fold for common_reference<T1, T2, Rest...> | |
3746 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3747 | struct __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3748 | __common_type_pack<_Rest...>, | |
3749 | void_t<common_reference_t<_Tp1, _Tp2>>> | |
3750 | : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...> | |
3751 | { }; | |
6963c3b9 | 3752 | /// @endcond |
0f8b14ee | 3753 | |
e641ee43 JW |
3754 | #endif // C++2a |
3755 | ||
6963c3b9 JW |
3756 | /// @} group metaprogramming |
3757 | ||
12ffa228 | 3758 | _GLIBCXX_END_NAMESPACE_VERSION |
c0ffa2ba | 3759 | } // namespace std |
7b50cdef | 3760 | |
734f5023 | 3761 | #endif // C++11 |
57317d2a | 3762 | |
7274deff | 3763 | #endif // _GLIBCXX_TYPE_TRAITS |