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c0ffa2ba | 1 | // C++11 <type_traits> -*- C++ -*- |
af13a7a6 | 2 | |
818ab71a | 3 | // Copyright (C) 2007-2016 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 | |
c0eef1c8 JW |
40 | #ifdef _GLIBCXX_USE_C99_STDINT_TR1 |
41 | # if defined (__UINT_LEAST16_TYPE__) && defined(__UINT_LEAST32_TYPE__) | |
21e2806a JW |
42 | namespace std |
43 | { | |
c0eef1c8 JW |
44 | typedef __UINT_LEAST16_TYPE__ uint_least16_t; |
45 | typedef __UINT_LEAST32_TYPE__ uint_least32_t; | |
21e2806a | 46 | } |
c0eef1c8 JW |
47 | # else |
48 | # include <cstdint> | |
49 | # endif | |
50 | #endif | |
51 | ||
21e2806a JW |
52 | namespace std _GLIBCXX_VISIBILITY(default) |
53 | { | |
54 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
55 | ||
8e32aa11 | 56 | /** |
c0ffa2ba | 57 | * @defgroup metaprogramming Metaprogramming |
13901e4b JW |
58 | * @ingroup utilities |
59 | * | |
60 | * Template utilities for compile-time introspection and modification, | |
61 | * including type classification traits, type property inspection traits | |
62 | * and type transformation traits. | |
63 | * | |
5b9daa7e BK |
64 | * @{ |
65 | */ | |
ac65b7d2 DK |
66 | |
67 | /// integral_constant | |
68 | template<typename _Tp, _Tp __v> | |
69 | struct integral_constant | |
70 | { | |
71 | static constexpr _Tp value = __v; | |
72 | typedef _Tp value_type; | |
73 | typedef integral_constant<_Tp, __v> type; | |
9191d7a8 | 74 | constexpr operator value_type() const { return value; } |
db113eda | 75 | #if __cplusplus > 201103L |
a15f7cb8 ESR |
76 | |
77 | #define __cpp_lib_integral_constant_callable 201304 | |
78 | ||
db113eda JW |
79 | constexpr value_type operator()() const { return value; } |
80 | #endif | |
ac65b7d2 DK |
81 | }; |
82 | ||
c0ffa2ba BK |
83 | template<typename _Tp, _Tp __v> |
84 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
85 | ||
13901e4b | 86 | /// The type used as a compile-time boolean with true value. |
ac65b7d2 DK |
87 | typedef integral_constant<bool, true> true_type; |
88 | ||
13901e4b | 89 | /// The type used as a compile-time boolean with false value. |
ac65b7d2 DK |
90 | typedef integral_constant<bool, false> false_type; |
91 | ||
f6b640be JW |
92 | template<bool __v> |
93 | using __bool_constant = integral_constant<bool, __v>; | |
94 | ||
46ba1281 | 95 | #if __cplusplus > 201402L |
f9badf71 | 96 | # define __cpp_lib_bool_constant 201505 |
46ba1281 JW |
97 | template<bool __v> |
98 | using bool_constant = integral_constant<bool, __v>; | |
99 | #endif | |
100 | ||
123c516a | 101 | // Meta programming helper types. |
53dc5044 | 102 | |
123c516a PC |
103 | template<bool, typename, typename> |
104 | struct conditional; | |
53dc5044 | 105 | |
dd7b175e | 106 | template<typename...> |
123c516a PC |
107 | struct __or_; |
108 | ||
ac65b7d2 DK |
109 | template<> |
110 | struct __or_<> | |
111 | : public false_type | |
112 | { }; | |
113 | ||
dd7b175e PC |
114 | template<typename _B1> |
115 | struct __or_<_B1> | |
116 | : public _B1 | |
117 | { }; | |
118 | ||
123c516a PC |
119 | template<typename _B1, typename _B2> |
120 | struct __or_<_B1, _B2> | |
121 | : public conditional<_B1::value, _B1, _B2>::type | |
122 | { }; | |
123 | ||
124 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
125 | struct __or_<_B1, _B2, _B3, _Bn...> | |
126 | : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type | |
127 | { }; | |
53dc5044 | 128 | |
dd7b175e | 129 | template<typename...> |
123c516a | 130 | struct __and_; |
53dc5044 | 131 | |
ac65b7d2 DK |
132 | template<> |
133 | struct __and_<> | |
134 | : public true_type | |
135 | { }; | |
136 | ||
dd7b175e PC |
137 | template<typename _B1> |
138 | struct __and_<_B1> | |
139 | : public _B1 | |
140 | { }; | |
141 | ||
123c516a PC |
142 | template<typename _B1, typename _B2> |
143 | struct __and_<_B1, _B2> | |
144 | : public conditional<_B1::value, _B2, _B1>::type | |
145 | { }; | |
146 | ||
147 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
148 | struct __and_<_B1, _B2, _B3, _Bn...> | |
149 | : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type | |
150 | { }; | |
151 | ||
152 | template<typename _Pp> | |
153 | struct __not_ | |
154 | : public integral_constant<bool, !_Pp::value> | |
155 | { }; | |
156 | ||
c3a6648b VV |
157 | #if __cplusplus > 201402L |
158 | ||
159 | #define __cpp_lib_logical_traits 201511 | |
160 | ||
161 | template<typename... _Bn> | |
162 | struct conjunction | |
163 | : __and_<_Bn...> | |
164 | { }; | |
165 | ||
166 | template<typename... _Bn> | |
167 | struct disjunction | |
168 | : __or_<_Bn...> | |
169 | { }; | |
170 | ||
171 | template<typename _Pp> | |
172 | struct negation | |
173 | : __not_<_Pp> | |
174 | { }; | |
175 | #endif | |
176 | ||
b3618b71 DK |
177 | // For several sfinae-friendly trait implementations we transport both the |
178 | // result information (as the member type) and the failure information (no | |
179 | // member type). This is very similar to std::enable_if, but we cannot use | |
180 | // them, because we need to derive from them as an implementation detail. | |
181 | ||
182 | template<typename _Tp> | |
183 | struct __success_type | |
184 | { typedef _Tp type; }; | |
185 | ||
186 | struct __failure_type | |
187 | { }; | |
188 | ||
c0ffa2ba | 189 | // Primary type categories. |
123c516a | 190 | |
53dc5044 PC |
191 | template<typename> |
192 | struct remove_cv; | |
193 | ||
194 | template<typename> | |
195 | struct __is_void_helper | |
196 | : public false_type { }; | |
53dc5044 | 197 | |
123c516a PC |
198 | template<> |
199 | struct __is_void_helper<void> | |
200 | : public true_type { }; | |
53dc5044 PC |
201 | |
202 | /// is_void | |
203 | template<typename _Tp> | |
204 | struct is_void | |
82b12c4b | 205 | : public __is_void_helper<typename remove_cv<_Tp>::type>::type |
53dc5044 PC |
206 | { }; |
207 | ||
208 | template<typename> | |
209 | struct __is_integral_helper | |
210 | : public false_type { }; | |
123c516a PC |
211 | |
212 | template<> | |
213 | struct __is_integral_helper<bool> | |
214 | : public true_type { }; | |
215 | ||
216 | template<> | |
217 | struct __is_integral_helper<char> | |
218 | : public true_type { }; | |
219 | ||
220 | template<> | |
221 | struct __is_integral_helper<signed char> | |
222 | : public true_type { }; | |
223 | ||
224 | template<> | |
225 | struct __is_integral_helper<unsigned char> | |
226 | : public true_type { }; | |
227 | ||
53dc5044 | 228 | #ifdef _GLIBCXX_USE_WCHAR_T |
123c516a PC |
229 | template<> |
230 | struct __is_integral_helper<wchar_t> | |
231 | : public true_type { }; | |
53dc5044 | 232 | #endif |
123c516a PC |
233 | |
234 | template<> | |
235 | struct __is_integral_helper<char16_t> | |
236 | : public true_type { }; | |
237 | ||
238 | template<> | |
239 | struct __is_integral_helper<char32_t> | |
240 | : public true_type { }; | |
241 | ||
242 | template<> | |
243 | struct __is_integral_helper<short> | |
244 | : public true_type { }; | |
245 | ||
246 | template<> | |
247 | struct __is_integral_helper<unsigned short> | |
248 | : public true_type { }; | |
249 | ||
250 | template<> | |
251 | struct __is_integral_helper<int> | |
252 | : public true_type { }; | |
253 | ||
254 | template<> | |
255 | struct __is_integral_helper<unsigned int> | |
256 | : public true_type { }; | |
257 | ||
258 | template<> | |
259 | struct __is_integral_helper<long> | |
260 | : public true_type { }; | |
261 | ||
262 | template<> | |
263 | struct __is_integral_helper<unsigned long> | |
264 | : public true_type { }; | |
265 | ||
266 | template<> | |
267 | struct __is_integral_helper<long long> | |
268 | : public true_type { }; | |
269 | ||
270 | template<> | |
271 | struct __is_integral_helper<unsigned long long> | |
272 | : public true_type { }; | |
53dc5044 | 273 | |
78a7c317 DD |
274 | // Conditionalizing on __STRICT_ANSI__ here will break any port that |
275 | // uses one of these types for size_t. | |
276 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
6d585f01 | 277 | template<> |
78a7c317 | 278 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> |
6d585f01 PC |
279 | : public true_type { }; |
280 | ||
281 | template<> | |
78a7c317 DD |
282 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> |
283 | : public true_type { }; | |
284 | #endif | |
285 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
286 | template<> | |
287 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> | |
288 | : public true_type { }; | |
289 | ||
290 | template<> | |
291 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> | |
292 | : public true_type { }; | |
293 | #endif | |
294 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
295 | template<> | |
296 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> | |
297 | : public true_type { }; | |
298 | ||
299 | template<> | |
300 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> | |
301 | : public true_type { }; | |
302 | #endif | |
303 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
304 | template<> | |
305 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> | |
306 | : public true_type { }; | |
307 | ||
308 | template<> | |
309 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> | |
6d585f01 PC |
310 | : public true_type { }; |
311 | #endif | |
312 | ||
53dc5044 PC |
313 | /// is_integral |
314 | template<typename _Tp> | |
315 | struct is_integral | |
82b12c4b | 316 | : public __is_integral_helper<typename remove_cv<_Tp>::type>::type |
53dc5044 PC |
317 | { }; |
318 | ||
319 | template<typename> | |
320 | struct __is_floating_point_helper | |
321 | : public false_type { }; | |
123c516a PC |
322 | |
323 | template<> | |
324 | struct __is_floating_point_helper<float> | |
325 | : public true_type { }; | |
326 | ||
327 | template<> | |
328 | struct __is_floating_point_helper<double> | |
329 | : public true_type { }; | |
330 | ||
331 | template<> | |
332 | struct __is_floating_point_helper<long double> | |
333 | : public true_type { }; | |
53dc5044 | 334 | |
6d585f01 PC |
335 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
336 | template<> | |
337 | struct __is_floating_point_helper<__float128> | |
338 | : public true_type { }; | |
339 | #endif | |
340 | ||
53dc5044 PC |
341 | /// is_floating_point |
342 | template<typename _Tp> | |
343 | struct is_floating_point | |
82b12c4b | 344 | : public __is_floating_point_helper<typename remove_cv<_Tp>::type>::type |
53dc5044 PC |
345 | { }; |
346 | ||
347 | /// is_array | |
348 | template<typename> | |
349 | struct is_array | |
350 | : public false_type { }; | |
351 | ||
352 | template<typename _Tp, std::size_t _Size> | |
353 | struct is_array<_Tp[_Size]> | |
354 | : public true_type { }; | |
355 | ||
356 | template<typename _Tp> | |
357 | struct is_array<_Tp[]> | |
358 | : public true_type { }; | |
359 | ||
360 | template<typename> | |
361 | struct __is_pointer_helper | |
362 | : public false_type { }; | |
123c516a PC |
363 | |
364 | template<typename _Tp> | |
365 | struct __is_pointer_helper<_Tp*> | |
366 | : public true_type { }; | |
53dc5044 PC |
367 | |
368 | /// is_pointer | |
369 | template<typename _Tp> | |
370 | struct is_pointer | |
82b12c4b | 371 | : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type |
53dc5044 PC |
372 | { }; |
373 | ||
123c516a PC |
374 | /// is_lvalue_reference |
375 | template<typename> | |
376 | struct is_lvalue_reference | |
377 | : public false_type { }; | |
378 | ||
53dc5044 | 379 | template<typename _Tp> |
123c516a PC |
380 | struct is_lvalue_reference<_Tp&> |
381 | : public true_type { }; | |
382 | ||
383 | /// is_rvalue_reference | |
384 | template<typename> | |
385 | struct is_rvalue_reference | |
386 | : public false_type { }; | |
53dc5044 | 387 | |
53dc5044 | 388 | template<typename _Tp> |
123c516a PC |
389 | struct is_rvalue_reference<_Tp&&> |
390 | : public true_type { }; | |
391 | ||
392 | template<typename> | |
53dc5044 PC |
393 | struct is_function; |
394 | ||
395 | template<typename> | |
396 | struct __is_member_object_pointer_helper | |
397 | : public false_type { }; | |
123c516a PC |
398 | |
399 | template<typename _Tp, typename _Cp> | |
400 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
401 | : public integral_constant<bool, !is_function<_Tp>::value> { }; | |
53dc5044 PC |
402 | |
403 | /// is_member_object_pointer | |
404 | template<typename _Tp> | |
405 | struct is_member_object_pointer | |
82b12c4b FD |
406 | : public __is_member_object_pointer_helper< |
407 | typename remove_cv<_Tp>::type>::type | |
53dc5044 PC |
408 | { }; |
409 | ||
410 | template<typename> | |
411 | struct __is_member_function_pointer_helper | |
412 | : public false_type { }; | |
123c516a PC |
413 | |
414 | template<typename _Tp, typename _Cp> | |
415 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
416 | : public integral_constant<bool, is_function<_Tp>::value> { }; | |
53dc5044 PC |
417 | |
418 | /// is_member_function_pointer | |
419 | template<typename _Tp> | |
420 | struct is_member_function_pointer | |
82b12c4b FD |
421 | : public __is_member_function_pointer_helper< |
422 | typename remove_cv<_Tp>::type>::type | |
53dc5044 PC |
423 | { }; |
424 | ||
425 | /// is_enum | |
426 | template<typename _Tp> | |
427 | struct is_enum | |
428 | : public integral_constant<bool, __is_enum(_Tp)> | |
429 | { }; | |
430 | ||
431 | /// is_union | |
432 | template<typename _Tp> | |
433 | struct is_union | |
434 | : public integral_constant<bool, __is_union(_Tp)> | |
435 | { }; | |
436 | ||
437 | /// is_class | |
438 | template<typename _Tp> | |
439 | struct is_class | |
440 | : public integral_constant<bool, __is_class(_Tp)> | |
441 | { }; | |
442 | ||
443 | /// is_function | |
444 | template<typename> | |
445 | struct is_function | |
446 | : public false_type { }; | |
123c516a | 447 | |
53dc5044 PC |
448 | template<typename _Res, typename... _ArgTypes> |
449 | struct is_function<_Res(_ArgTypes...)> | |
450 | : public true_type { }; | |
123c516a | 451 | |
89898034 DK |
452 | template<typename _Res, typename... _ArgTypes> |
453 | struct is_function<_Res(_ArgTypes...) &> | |
454 | : public true_type { }; | |
455 | ||
456 | template<typename _Res, typename... _ArgTypes> | |
457 | struct is_function<_Res(_ArgTypes...) &&> | |
458 | : public true_type { }; | |
459 | ||
53dc5044 PC |
460 | template<typename _Res, typename... _ArgTypes> |
461 | struct is_function<_Res(_ArgTypes......)> | |
462 | : public true_type { }; | |
123c516a | 463 | |
89898034 DK |
464 | template<typename _Res, typename... _ArgTypes> |
465 | struct is_function<_Res(_ArgTypes......) &> | |
466 | : public true_type { }; | |
467 | ||
468 | template<typename _Res, typename... _ArgTypes> | |
469 | struct is_function<_Res(_ArgTypes......) &&> | |
470 | : public true_type { }; | |
471 | ||
53dc5044 PC |
472 | template<typename _Res, typename... _ArgTypes> |
473 | struct is_function<_Res(_ArgTypes...) const> | |
474 | : public true_type { }; | |
123c516a | 475 | |
89898034 DK |
476 | template<typename _Res, typename... _ArgTypes> |
477 | struct is_function<_Res(_ArgTypes...) const &> | |
478 | : public true_type { }; | |
479 | ||
480 | template<typename _Res, typename... _ArgTypes> | |
481 | struct is_function<_Res(_ArgTypes...) const &&> | |
482 | : public true_type { }; | |
483 | ||
53dc5044 PC |
484 | template<typename _Res, typename... _ArgTypes> |
485 | struct is_function<_Res(_ArgTypes......) const> | |
486 | : public true_type { }; | |
123c516a | 487 | |
89898034 DK |
488 | template<typename _Res, typename... _ArgTypes> |
489 | struct is_function<_Res(_ArgTypes......) const &> | |
490 | : public true_type { }; | |
491 | ||
492 | template<typename _Res, typename... _ArgTypes> | |
493 | struct is_function<_Res(_ArgTypes......) const &&> | |
494 | : public true_type { }; | |
495 | ||
53dc5044 PC |
496 | template<typename _Res, typename... _ArgTypes> |
497 | struct is_function<_Res(_ArgTypes...) volatile> | |
498 | : public true_type { }; | |
123c516a | 499 | |
89898034 DK |
500 | template<typename _Res, typename... _ArgTypes> |
501 | struct is_function<_Res(_ArgTypes...) volatile &> | |
502 | : public true_type { }; | |
503 | ||
504 | template<typename _Res, typename... _ArgTypes> | |
505 | struct is_function<_Res(_ArgTypes...) volatile &&> | |
506 | : public true_type { }; | |
507 | ||
53dc5044 PC |
508 | template<typename _Res, typename... _ArgTypes> |
509 | struct is_function<_Res(_ArgTypes......) volatile> | |
510 | : public true_type { }; | |
123c516a | 511 | |
89898034 DK |
512 | template<typename _Res, typename... _ArgTypes> |
513 | struct is_function<_Res(_ArgTypes......) volatile &> | |
514 | : public true_type { }; | |
515 | ||
516 | template<typename _Res, typename... _ArgTypes> | |
517 | struct is_function<_Res(_ArgTypes......) volatile &&> | |
518 | : public true_type { }; | |
519 | ||
53dc5044 PC |
520 | template<typename _Res, typename... _ArgTypes> |
521 | struct is_function<_Res(_ArgTypes...) const volatile> | |
522 | : public true_type { }; | |
123c516a | 523 | |
89898034 DK |
524 | template<typename _Res, typename... _ArgTypes> |
525 | struct is_function<_Res(_ArgTypes...) const volatile &> | |
526 | : public true_type { }; | |
527 | ||
528 | template<typename _Res, typename... _ArgTypes> | |
529 | struct is_function<_Res(_ArgTypes...) const volatile &&> | |
530 | : public true_type { }; | |
531 | ||
53dc5044 PC |
532 | template<typename _Res, typename... _ArgTypes> |
533 | struct is_function<_Res(_ArgTypes......) const volatile> | |
534 | : public true_type { }; | |
535 | ||
89898034 DK |
536 | template<typename _Res, typename... _ArgTypes> |
537 | struct is_function<_Res(_ArgTypes......) const volatile &> | |
538 | : public true_type { }; | |
539 | ||
540 | template<typename _Res, typename... _ArgTypes> | |
541 | struct is_function<_Res(_ArgTypes......) const volatile &&> | |
542 | : public true_type { }; | |
543 | ||
a15f7cb8 ESR |
544 | #define __cpp_lib_is_null_pointer 201309 |
545 | ||
1e673415 | 546 | template<typename> |
aa940ab5 | 547 | struct __is_null_pointer_helper |
1e673415 | 548 | : public false_type { }; |
123c516a PC |
549 | |
550 | template<> | |
aa940ab5 | 551 | struct __is_null_pointer_helper<std::nullptr_t> |
123c516a | 552 | : public true_type { }; |
1e673415 | 553 | |
aa940ab5 PC |
554 | /// is_null_pointer (LWG 2247). |
555 | template<typename _Tp> | |
556 | struct is_null_pointer | |
557 | : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type | |
558 | { }; | |
559 | ||
560 | /// __is_nullptr_t (extension). | |
1e673415 PC |
561 | template<typename _Tp> |
562 | struct __is_nullptr_t | |
aa940ab5 | 563 | : public is_null_pointer<_Tp> |
1e673415 PC |
564 | { }; |
565 | ||
c0ffa2ba | 566 | // Composite type categories. |
123c516a PC |
567 | |
568 | /// is_reference | |
569 | template<typename _Tp> | |
570 | struct is_reference | |
571 | : public __or_<is_lvalue_reference<_Tp>, | |
572 | is_rvalue_reference<_Tp>>::type | |
573 | { }; | |
574 | ||
53dc5044 PC |
575 | /// is_arithmetic |
576 | template<typename _Tp> | |
577 | struct is_arithmetic | |
123c516a | 578 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
579 | { }; |
580 | ||
581 | /// is_fundamental | |
582 | template<typename _Tp> | |
583 | struct is_fundamental | |
aa940ab5 PC |
584 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, |
585 | is_null_pointer<_Tp>>::type | |
53dc5044 PC |
586 | { }; |
587 | ||
588 | /// is_object | |
589 | template<typename _Tp> | |
590 | struct is_object | |
123c516a PC |
591 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
592 | is_void<_Tp>>>::type | |
53dc5044 PC |
593 | { }; |
594 | ||
123c516a | 595 | template<typename> |
53dc5044 PC |
596 | struct is_member_pointer; |
597 | ||
598 | /// is_scalar | |
599 | template<typename _Tp> | |
600 | struct is_scalar | |
123c516a | 601 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
aa940ab5 | 602 | is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type |
53dc5044 PC |
603 | { }; |
604 | ||
605 | /// is_compound | |
606 | template<typename _Tp> | |
607 | struct is_compound | |
608 | : public integral_constant<bool, !is_fundamental<_Tp>::value> { }; | |
609 | ||
53dc5044 PC |
610 | template<typename _Tp> |
611 | struct __is_member_pointer_helper | |
612 | : public false_type { }; | |
123c516a PC |
613 | |
614 | template<typename _Tp, typename _Cp> | |
615 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
616 | : public true_type { }; | |
53dc5044 | 617 | |
13901e4b | 618 | /// is_member_pointer |
53dc5044 | 619 | template<typename _Tp> |
123c516a | 620 | struct is_member_pointer |
82b12c4b | 621 | : public __is_member_pointer_helper<typename remove_cv<_Tp>::type>::type |
53dc5044 PC |
622 | { }; |
623 | ||
89898034 DK |
624 | // Utility to detect referenceable types ([defns.referenceable]). |
625 | ||
626 | template<typename _Tp> | |
627 | struct __is_referenceable | |
628 | : public __or_<is_object<_Tp>, is_reference<_Tp>>::type | |
629 | { }; | |
630 | ||
631 | template<typename _Res, typename... _Args> | |
632 | struct __is_referenceable<_Res(_Args...)> | |
633 | : public true_type | |
634 | { }; | |
635 | ||
636 | template<typename _Res, typename... _Args> | |
637 | struct __is_referenceable<_Res(_Args......)> | |
638 | : public true_type | |
639 | { }; | |
640 | ||
c0ffa2ba | 641 | // Type properties. |
123c516a | 642 | |
53dc5044 PC |
643 | /// is_const |
644 | template<typename> | |
645 | struct is_const | |
646 | : public false_type { }; | |
647 | ||
648 | template<typename _Tp> | |
649 | struct is_const<_Tp const> | |
650 | : public true_type { }; | |
651 | ||
652 | /// is_volatile | |
653 | template<typename> | |
654 | struct is_volatile | |
655 | : public false_type { }; | |
656 | ||
657 | template<typename _Tp> | |
658 | struct is_volatile<_Tp volatile> | |
659 | : public true_type { }; | |
660 | ||
123c516a PC |
661 | /// is_trivial |
662 | template<typename _Tp> | |
663 | struct is_trivial | |
664 | : public integral_constant<bool, __is_trivial(_Tp)> | |
665 | { }; | |
666 | ||
f5e523b7 VV |
667 | // is_trivially_copyable |
668 | template<typename _Tp> | |
669 | struct is_trivially_copyable | |
670 | : public integral_constant<bool, __is_trivially_copyable(_Tp)> | |
671 | { }; | |
123c516a PC |
672 | |
673 | /// is_standard_layout | |
674 | template<typename _Tp> | |
675 | struct is_standard_layout | |
676 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
677 | { }; | |
678 | ||
679 | /// is_pod | |
680 | // Could use is_standard_layout && is_trivial instead of the builtin. | |
681 | template<typename _Tp> | |
682 | struct is_pod | |
683 | : public integral_constant<bool, __is_pod(_Tp)> | |
684 | { }; | |
685 | ||
686 | /// is_literal_type | |
687 | template<typename _Tp> | |
688 | struct is_literal_type | |
689 | : public integral_constant<bool, __is_literal_type(_Tp)> | |
690 | { }; | |
691 | ||
53dc5044 PC |
692 | /// is_empty |
693 | template<typename _Tp> | |
694 | struct is_empty | |
695 | : public integral_constant<bool, __is_empty(_Tp)> | |
696 | { }; | |
697 | ||
698 | /// is_polymorphic | |
699 | template<typename _Tp> | |
700 | struct is_polymorphic | |
701 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
702 | { }; | |
703 | ||
4db7fcb9 ESR |
704 | #if __cplusplus >= 201402L |
705 | #define __cpp_lib_is_final 201402L | |
706 | /// is_final | |
707 | template<typename _Tp> | |
708 | struct is_final | |
709 | : public integral_constant<bool, __is_final(_Tp)> | |
710 | { }; | |
711 | #endif | |
712 | ||
53dc5044 PC |
713 | /// is_abstract |
714 | template<typename _Tp> | |
715 | struct is_abstract | |
716 | : public integral_constant<bool, __is_abstract(_Tp)> | |
717 | { }; | |
718 | ||
123c516a | 719 | template<typename _Tp, |
6a4b1a00 | 720 | bool = is_arithmetic<_Tp>::value> |
123c516a PC |
721 | struct __is_signed_helper |
722 | : public false_type { }; | |
723 | ||
53dc5044 | 724 | template<typename _Tp> |
6a4b1a00 PC |
725 | struct __is_signed_helper<_Tp, true> |
726 | : public integral_constant<bool, _Tp(-1) < _Tp(0)> | |
53dc5044 PC |
727 | { }; |
728 | ||
123c516a | 729 | /// is_signed |
53dc5044 | 730 | template<typename _Tp> |
123c516a | 731 | struct is_signed |
82b12c4b | 732 | : public __is_signed_helper<_Tp>::type |
123c516a PC |
733 | { }; |
734 | ||
735 | /// is_unsigned | |
736 | template<typename _Tp> | |
737 | struct is_unsigned | |
f7632193 | 738 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>> |
123c516a PC |
739 | { }; |
740 | ||
741 | ||
c0ffa2ba | 742 | // Destructible and constructible type properties. |
123c516a | 743 | |
53dc5044 | 744 | template<typename> |
123c516a | 745 | struct add_rvalue_reference; |
53dc5044 | 746 | |
13901e4b JW |
747 | /** |
748 | * @brief Utility to simplify expressions used in unevaluated operands | |
749 | * @ingroup utilities | |
750 | */ | |
53dc5044 | 751 | template<typename _Tp> |
123c516a | 752 | typename add_rvalue_reference<_Tp>::type declval() noexcept; |
53dc5044 | 753 | |
123c516a PC |
754 | template<typename, unsigned = 0> |
755 | struct extent; | |
756 | ||
757 | template<typename> | |
758 | struct remove_all_extents; | |
759 | ||
760 | template<typename _Tp> | |
761 | struct __is_array_known_bounds | |
762 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
763 | { }; |
764 | ||
123c516a PC |
765 | template<typename _Tp> |
766 | struct __is_array_unknown_bounds | |
f7632193 | 767 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>> |
53dc5044 | 768 | { }; |
2c7a09d7 | 769 | |
62fa805f | 770 | // In N3290 is_destructible does not say anything about function |
2c7a09d7 | 771 | // types and abstract types, see LWG 2049. This implementation |
62fa805f DK |
772 | // describes function types as non-destructible and all complete |
773 | // object types as destructible, iff the explicit destructor | |
2c7a09d7 | 774 | // call expression is wellformed. |
62fa805f | 775 | struct __do_is_destructible_impl |
123c516a | 776 | { |
62fa805f | 777 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
123c516a PC |
778 | static true_type __test(int); |
779 | ||
780 | template<typename> | |
781 | static false_type __test(...); | |
782 | }; | |
53dc5044 PC |
783 | |
784 | template<typename _Tp> | |
62fa805f DK |
785 | struct __is_destructible_impl |
786 | : public __do_is_destructible_impl | |
123c516a PC |
787 | { |
788 | typedef decltype(__test<_Tp>(0)) type; | |
789 | }; | |
53dc5044 | 790 | |
62fa805f DK |
791 | template<typename _Tp, |
792 | bool = __or_<is_void<_Tp>, | |
793 | __is_array_unknown_bounds<_Tp>, | |
794 | is_function<_Tp>>::value, | |
795 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
796 | struct __is_destructible_safe; | |
797 | ||
798 | template<typename _Tp> | |
799 | struct __is_destructible_safe<_Tp, false, false> | |
800 | : public __is_destructible_impl<typename | |
801 | remove_all_extents<_Tp>::type>::type | |
802 | { }; | |
803 | ||
804 | template<typename _Tp> | |
805 | struct __is_destructible_safe<_Tp, true, false> | |
806 | : public false_type { }; | |
807 | ||
808 | template<typename _Tp> | |
809 | struct __is_destructible_safe<_Tp, false, true> | |
810 | : public true_type { }; | |
811 | ||
812 | /// is_destructible | |
813 | template<typename _Tp> | |
814 | struct is_destructible | |
82b12c4b | 815 | : public __is_destructible_safe<_Tp>::type |
62fa805f DK |
816 | { }; |
817 | ||
818 | // is_nothrow_destructible requires that is_destructible is | |
819 | // satisfied as well. We realize that by mimicing the | |
820 | // implementation of is_destructible but refer to noexcept(expr) | |
821 | // instead of decltype(expr). | |
822 | struct __do_is_nt_destructible_impl | |
123c516a | 823 | { |
62fa805f DK |
824 | template<typename _Tp> |
825 | static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())> | |
826 | __test(int); | |
123c516a PC |
827 | |
828 | template<typename> | |
829 | static false_type __test(...); | |
830 | }; | |
53dc5044 | 831 | |
53dc5044 | 832 | template<typename _Tp> |
62fa805f DK |
833 | struct __is_nt_destructible_impl |
834 | : public __do_is_nt_destructible_impl | |
123c516a PC |
835 | { |
836 | typedef decltype(__test<_Tp>(0)) type; | |
837 | }; | |
838 | ||
839 | template<typename _Tp, | |
840 | bool = __or_<is_void<_Tp>, | |
62fa805f DK |
841 | __is_array_unknown_bounds<_Tp>, |
842 | is_function<_Tp>>::value, | |
843 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
844 | struct __is_nt_destructible_safe; | |
53dc5044 PC |
845 | |
846 | template<typename _Tp> | |
62fa805f DK |
847 | struct __is_nt_destructible_safe<_Tp, false, false> |
848 | : public __is_nt_destructible_impl<typename | |
849 | remove_all_extents<_Tp>::type>::type | |
123c516a PC |
850 | { }; |
851 | ||
53dc5044 | 852 | template<typename _Tp> |
62fa805f | 853 | struct __is_nt_destructible_safe<_Tp, true, false> |
123c516a | 854 | : public false_type { }; |
53dc5044 PC |
855 | |
856 | template<typename _Tp> | |
62fa805f | 857 | struct __is_nt_destructible_safe<_Tp, false, true> |
123c516a PC |
858 | : public true_type { }; |
859 | ||
62fa805f | 860 | /// is_nothrow_destructible |
53dc5044 | 861 | template<typename _Tp> |
62fa805f | 862 | struct is_nothrow_destructible |
82b12c4b | 863 | : public __is_nt_destructible_safe<_Tp>::type |
123c516a PC |
864 | { }; |
865 | ||
866 | struct __do_is_default_constructible_impl | |
867 | { | |
868 | template<typename _Tp, typename = decltype(_Tp())> | |
869 | static true_type __test(int); | |
870 | ||
871 | template<typename> | |
872 | static false_type __test(...); | |
873 | }; | |
874 | ||
875 | template<typename _Tp> | |
876 | struct __is_default_constructible_impl | |
877 | : public __do_is_default_constructible_impl | |
53dc5044 | 878 | { |
123c516a | 879 | typedef decltype(__test<_Tp>(0)) type; |
53dc5044 | 880 | }; |
53dc5044 PC |
881 | |
882 | template<typename _Tp> | |
123c516a | 883 | struct __is_default_constructible_atom |
2c7a09d7 | 884 | : public __and_<__not_<is_void<_Tp>>, |
f7632193 | 885 | __is_default_constructible_impl<_Tp>> |
123c516a | 886 | { }; |
53dc5044 | 887 | |
123c516a PC |
888 | template<typename _Tp, bool = is_array<_Tp>::value> |
889 | struct __is_default_constructible_safe; | |
53dc5044 | 890 | |
2c7a09d7 PC |
891 | // The following technique is a workaround for a current core language |
892 | // restriction, which does not allow for array types to occur in | |
893 | // functional casts of the form T(). Complete arrays can be default- | |
894 | // constructed, if the element type is default-constructible, but | |
895 | // arrays with unknown bounds are not. | |
53dc5044 | 896 | template<typename _Tp> |
123c516a PC |
897 | struct __is_default_constructible_safe<_Tp, true> |
898 | : public __and_<__is_array_known_bounds<_Tp>, | |
899 | __is_default_constructible_atom<typename | |
f7632193 | 900 | remove_all_extents<_Tp>::type>> |
53dc5044 PC |
901 | { }; |
902 | ||
53dc5044 | 903 | template<typename _Tp> |
123c516a PC |
904 | struct __is_default_constructible_safe<_Tp, false> |
905 | : public __is_default_constructible_atom<_Tp>::type | |
906 | { }; | |
4a27a739 | 907 | |
123c516a | 908 | /// is_default_constructible |
4a27a739 | 909 | template<typename _Tp> |
123c516a | 910 | struct is_default_constructible |
82b12c4b | 911 | : public __is_default_constructible_safe<_Tp>::type |
123c516a | 912 | { }; |
4a27a739 | 913 | |
2c7a09d7 PC |
914 | |
915 | // Implementation of is_constructible. | |
916 | ||
917 | // The hardest part of this trait is the binary direct-initialization | |
918 | // case, because we hit into a functional cast of the form T(arg). | |
919 | // This implementation uses different strategies depending on the | |
920 | // target type to reduce the test overhead as much as possible: | |
921 | // | |
922 | // a) For a reference target type, we use a static_cast expression | |
923 | // modulo its extra cases. | |
924 | // | |
925 | // b) For a non-reference target type we use a ::new expression. | |
123c516a PC |
926 | struct __do_is_static_castable_impl |
927 | { | |
928 | template<typename _From, typename _To, typename | |
929 | = decltype(static_cast<_To>(declval<_From>()))> | |
930 | static true_type __test(int); | |
4a27a739 | 931 | |
123c516a PC |
932 | template<typename, typename> |
933 | static false_type __test(...); | |
934 | }; | |
4a27a739 | 935 | |
123c516a PC |
936 | template<typename _From, typename _To> |
937 | struct __is_static_castable_impl | |
938 | : public __do_is_static_castable_impl | |
939 | { | |
940 | typedef decltype(__test<_From, _To>(0)) type; | |
941 | }; | |
939759fc | 942 | |
123c516a PC |
943 | template<typename _From, typename _To> |
944 | struct __is_static_castable_safe | |
2c7a09d7 | 945 | : public __is_static_castable_impl<_From, _To>::type |
4a27a739 PC |
946 | { }; |
947 | ||
123c516a PC |
948 | // __is_static_castable |
949 | template<typename _From, typename _To> | |
950 | struct __is_static_castable | |
951 | : public integral_constant<bool, (__is_static_castable_safe< | |
952 | _From, _To>::value)> | |
953 | { }; | |
939759fc | 954 | |
2c7a09d7 PC |
955 | // Implementation for non-reference types. To meet the proper |
956 | // variable definition semantics, we also need to test for | |
957 | // is_destructible in this case. | |
5db25ab1 DK |
958 | // This form should be simplified by a single expression: |
959 | // ::delete ::new _Tp(declval<_Arg>()), see c++/51222. | |
123c516a PC |
960 | struct __do_is_direct_constructible_impl |
961 | { | |
962 | template<typename _Tp, typename _Arg, typename | |
963 | = decltype(::new _Tp(declval<_Arg>()))> | |
964 | static true_type __test(int); | |
4a27a739 | 965 | |
123c516a PC |
966 | template<typename, typename> |
967 | static false_type __test(...); | |
968 | }; | |
4a27a739 | 969 | |
123c516a PC |
970 | template<typename _Tp, typename _Arg> |
971 | struct __is_direct_constructible_impl | |
972 | : public __do_is_direct_constructible_impl | |
973 | { | |
974 | typedef decltype(__test<_Tp, _Arg>(0)) type; | |
975 | }; | |
4a27a739 | 976 | |
123c516a PC |
977 | template<typename _Tp, typename _Arg> |
978 | struct __is_direct_constructible_new_safe | |
979 | : public __and_<is_destructible<_Tp>, | |
f7632193 | 980 | __is_direct_constructible_impl<_Tp, _Arg>> |
123c516a | 981 | { }; |
4a27a739 | 982 | |
123c516a PC |
983 | template<typename, typename> |
984 | struct is_same; | |
4a27a739 | 985 | |
123c516a PC |
986 | template<typename, typename> |
987 | struct is_base_of; | |
4a27a739 | 988 | |
123c516a PC |
989 | template<typename> |
990 | struct remove_reference; | |
4a27a739 | 991 | |
123c516a | 992 | template<typename _From, typename _To, bool |
5db25ab1 DK |
993 | = __not_<__or_<is_void<_From>, |
994 | is_function<_From>>>::value> | |
123c516a | 995 | struct __is_base_to_derived_ref; |
4a27a739 | 996 | |
5db25ab1 DK |
997 | // Detect whether we have a downcast situation during |
998 | // reference binding. | |
123c516a PC |
999 | template<typename _From, typename _To> |
1000 | struct __is_base_to_derived_ref<_From, _To, true> | |
1001 | { | |
1002 | typedef typename remove_cv<typename remove_reference<_From | |
1003 | >::type>::type __src_t; | |
1004 | typedef typename remove_cv<typename remove_reference<_To | |
1005 | >::type>::type __dst_t; | |
2c7a09d7 PC |
1006 | typedef __and_<__not_<is_same<__src_t, __dst_t>>, |
1007 | is_base_of<__src_t, __dst_t>> type; | |
123c516a PC |
1008 | static constexpr bool value = type::value; |
1009 | }; | |
4a27a739 | 1010 | |
123c516a PC |
1011 | template<typename _From, typename _To> |
1012 | struct __is_base_to_derived_ref<_From, _To, false> | |
1013 | : public false_type | |
4a27a739 PC |
1014 | { }; |
1015 | ||
123c516a PC |
1016 | template<typename _From, typename _To, bool |
1017 | = __and_<is_lvalue_reference<_From>, | |
1018 | is_rvalue_reference<_To>>::value> | |
1019 | struct __is_lvalue_to_rvalue_ref; | |
e133ace8 | 1020 | |
5db25ab1 DK |
1021 | // Detect whether we have an lvalue of non-function type |
1022 | // bound to a reference-compatible rvalue-reference. | |
123c516a PC |
1023 | template<typename _From, typename _To> |
1024 | struct __is_lvalue_to_rvalue_ref<_From, _To, true> | |
1025 | { | |
1026 | typedef typename remove_cv<typename remove_reference< | |
1027 | _From>::type>::type __src_t; | |
1028 | typedef typename remove_cv<typename remove_reference< | |
1029 | _To>::type>::type __dst_t; | |
5db25ab1 DK |
1030 | typedef __and_<__not_<is_function<__src_t>>, |
1031 | __or_<is_same<__src_t, __dst_t>, | |
1032 | is_base_of<__dst_t, __src_t>>> type; | |
123c516a PC |
1033 | static constexpr bool value = type::value; |
1034 | }; | |
e133ace8 | 1035 | |
123c516a PC |
1036 | template<typename _From, typename _To> |
1037 | struct __is_lvalue_to_rvalue_ref<_From, _To, false> | |
1038 | : public false_type | |
e133ace8 PC |
1039 | { }; |
1040 | ||
2c7a09d7 PC |
1041 | // Here we handle direct-initialization to a reference type as |
1042 | // equivalent to a static_cast modulo overshooting conversions. | |
1043 | // These are restricted to the following conversions: | |
5db25ab1 | 1044 | // a) A base class value to a derived class reference |
2c7a09d7 | 1045 | // b) An lvalue to an rvalue-reference of reference-compatible |
5db25ab1 | 1046 | // types that are not functions |
123c516a PC |
1047 | template<typename _Tp, typename _Arg> |
1048 | struct __is_direct_constructible_ref_cast | |
1049 | : public __and_<__is_static_castable<_Arg, _Tp>, | |
1050 | __not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>, | |
1051 | __is_lvalue_to_rvalue_ref<_Arg, _Tp> | |
f7632193 | 1052 | >>> |
e133ace8 PC |
1053 | { }; |
1054 | ||
123c516a PC |
1055 | template<typename _Tp, typename _Arg> |
1056 | struct __is_direct_constructible_new | |
1057 | : public conditional<is_reference<_Tp>::value, | |
1058 | __is_direct_constructible_ref_cast<_Tp, _Arg>, | |
1059 | __is_direct_constructible_new_safe<_Tp, _Arg> | |
1060 | >::type | |
b0302c68 PC |
1061 | { }; |
1062 | ||
123c516a PC |
1063 | template<typename _Tp, typename _Arg> |
1064 | struct __is_direct_constructible | |
82b12c4b | 1065 | : public __is_direct_constructible_new<_Tp, _Arg>::type |
e133ace8 PC |
1066 | { }; |
1067 | ||
2c7a09d7 PC |
1068 | // Since default-construction and binary direct-initialization have |
1069 | // been handled separately, the implementation of the remaining | |
5db25ab1 DK |
1070 | // n-ary construction cases is rather straightforward. We can use |
1071 | // here a functional cast, because array types are excluded anyway | |
1072 | // and this form is never interpreted as a C cast. | |
123c516a PC |
1073 | struct __do_is_nary_constructible_impl |
1074 | { | |
1075 | template<typename _Tp, typename... _Args, typename | |
1076 | = decltype(_Tp(declval<_Args>()...))> | |
1077 | static true_type __test(int); | |
2b08f2c5 | 1078 | |
123c516a PC |
1079 | template<typename, typename...> |
1080 | static false_type __test(...); | |
1081 | }; | |
b0302c68 PC |
1082 | |
1083 | template<typename _Tp, typename... _Args> | |
123c516a PC |
1084 | struct __is_nary_constructible_impl |
1085 | : public __do_is_nary_constructible_impl | |
b0302c68 | 1086 | { |
123c516a | 1087 | typedef decltype(__test<_Tp, _Args...>(0)) type; |
b0302c68 PC |
1088 | }; |
1089 | ||
123c516a PC |
1090 | template<typename _Tp, typename... _Args> |
1091 | struct __is_nary_constructible | |
2c7a09d7 | 1092 | : public __is_nary_constructible_impl<_Tp, _Args...>::type |
b0302c68 | 1093 | { |
123c516a PC |
1094 | static_assert(sizeof...(_Args) > 1, |
1095 | "Only useful for > 1 arguments"); | |
1096 | }; | |
b0302c68 | 1097 | |
123c516a PC |
1098 | template<typename _Tp, typename... _Args> |
1099 | struct __is_constructible_impl | |
1100 | : public __is_nary_constructible<_Tp, _Args...> | |
1101 | { }; | |
b0302c68 | 1102 | |
123c516a PC |
1103 | template<typename _Tp, typename _Arg> |
1104 | struct __is_constructible_impl<_Tp, _Arg> | |
1105 | : public __is_direct_constructible<_Tp, _Arg> | |
1106 | { }; | |
1107 | ||
1108 | template<typename _Tp> | |
1109 | struct __is_constructible_impl<_Tp> | |
1110 | : public is_default_constructible<_Tp> | |
1111 | { }; | |
b0302c68 PC |
1112 | |
1113 | /// is_constructible | |
b0302c68 PC |
1114 | template<typename _Tp, typename... _Args> |
1115 | struct is_constructible | |
82b12c4b | 1116 | : public __is_constructible_impl<_Tp, _Args...>::type |
c32097d8 JM |
1117 | { }; |
1118 | ||
89898034 | 1119 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd | 1120 | struct __is_copy_constructible_impl; |
123c516a | 1121 | |
65cee9bd | 1122 | template<typename _Tp> |
89898034 | 1123 | struct __is_copy_constructible_impl<_Tp, false> |
65cee9bd PC |
1124 | : public false_type { }; |
1125 | ||
1126 | template<typename _Tp> | |
89898034 | 1127 | struct __is_copy_constructible_impl<_Tp, true> |
65cee9bd PC |
1128 | : public is_constructible<_Tp, const _Tp&> |
1129 | { }; | |
1130 | ||
1131 | /// is_copy_constructible | |
1132 | template<typename _Tp> | |
1133 | struct is_copy_constructible | |
1134 | : public __is_copy_constructible_impl<_Tp> | |
1135 | { }; | |
1136 | ||
89898034 | 1137 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1138 | struct __is_move_constructible_impl; |
1139 | ||
1140 | template<typename _Tp> | |
89898034 | 1141 | struct __is_move_constructible_impl<_Tp, false> |
65cee9bd PC |
1142 | : public false_type { }; |
1143 | ||
1144 | template<typename _Tp> | |
89898034 | 1145 | struct __is_move_constructible_impl<_Tp, true> |
65cee9bd PC |
1146 | : public is_constructible<_Tp, _Tp&&> |
1147 | { }; | |
1148 | ||
1149 | /// is_move_constructible | |
1150 | template<typename _Tp> | |
1151 | struct is_move_constructible | |
1152 | : public __is_move_constructible_impl<_Tp> | |
1153 | { }; | |
1154 | ||
1155 | template<typename _Tp> | |
1156 | struct __is_nt_default_constructible_atom | |
1157 | : public integral_constant<bool, noexcept(_Tp())> | |
1158 | { }; | |
1159 | ||
1160 | template<typename _Tp, bool = is_array<_Tp>::value> | |
1161 | struct __is_nt_default_constructible_impl; | |
1162 | ||
1163 | template<typename _Tp> | |
1164 | struct __is_nt_default_constructible_impl<_Tp, true> | |
1165 | : public __and_<__is_array_known_bounds<_Tp>, | |
1166 | __is_nt_default_constructible_atom<typename | |
f7632193 | 1167 | remove_all_extents<_Tp>::type>> |
65cee9bd PC |
1168 | { }; |
1169 | ||
1170 | template<typename _Tp> | |
1171 | struct __is_nt_default_constructible_impl<_Tp, false> | |
1172 | : public __is_nt_default_constructible_atom<_Tp> | |
1173 | { }; | |
1174 | ||
1175 | /// is_nothrow_default_constructible | |
1176 | template<typename _Tp> | |
1177 | struct is_nothrow_default_constructible | |
1178 | : public __and_<is_default_constructible<_Tp>, | |
f7632193 | 1179 | __is_nt_default_constructible_impl<_Tp>> |
65cee9bd | 1180 | { }; |
e4f32cb0 PC |
1181 | |
1182 | template<typename _Tp, typename... _Args> | |
65cee9bd PC |
1183 | struct __is_nt_constructible_impl |
1184 | : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> | |
1185 | { }; | |
e4f32cb0 PC |
1186 | |
1187 | template<typename _Tp, typename _Arg> | |
65cee9bd PC |
1188 | struct __is_nt_constructible_impl<_Tp, _Arg> |
1189 | : public integral_constant<bool, | |
1190 | noexcept(static_cast<_Tp>(declval<_Arg>()))> | |
1191 | { }; | |
1192 | ||
1193 | template<typename _Tp> | |
1194 | struct __is_nt_constructible_impl<_Tp> | |
1195 | : public is_nothrow_default_constructible<_Tp> | |
1196 | { }; | |
e4f32cb0 PC |
1197 | |
1198 | /// is_nothrow_constructible | |
1199 | template<typename _Tp, typename... _Args> | |
1200 | struct is_nothrow_constructible | |
65cee9bd | 1201 | : public __and_<is_constructible<_Tp, _Args...>, |
f7632193 | 1202 | __is_nt_constructible_impl<_Tp, _Args...>> |
65cee9bd PC |
1203 | { }; |
1204 | ||
89898034 | 1205 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1206 | struct __is_nothrow_copy_constructible_impl; |
1207 | ||
1208 | template<typename _Tp> | |
89898034 | 1209 | struct __is_nothrow_copy_constructible_impl<_Tp, false> |
65cee9bd PC |
1210 | : public false_type { }; |
1211 | ||
1212 | template<typename _Tp> | |
89898034 | 1213 | struct __is_nothrow_copy_constructible_impl<_Tp, true> |
65cee9bd PC |
1214 | : public is_nothrow_constructible<_Tp, const _Tp&> |
1215 | { }; | |
1216 | ||
1217 | /// is_nothrow_copy_constructible | |
1218 | template<typename _Tp> | |
1219 | struct is_nothrow_copy_constructible | |
1220 | : public __is_nothrow_copy_constructible_impl<_Tp> | |
1221 | { }; | |
1222 | ||
89898034 | 1223 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
65cee9bd PC |
1224 | struct __is_nothrow_move_constructible_impl; |
1225 | ||
1226 | template<typename _Tp> | |
89898034 | 1227 | struct __is_nothrow_move_constructible_impl<_Tp, false> |
65cee9bd PC |
1228 | : public false_type { }; |
1229 | ||
1230 | template<typename _Tp> | |
89898034 | 1231 | struct __is_nothrow_move_constructible_impl<_Tp, true> |
65cee9bd PC |
1232 | : public is_nothrow_constructible<_Tp, _Tp&&> |
1233 | { }; | |
1234 | ||
1235 | /// is_nothrow_move_constructible | |
1236 | template<typename _Tp> | |
1237 | struct is_nothrow_move_constructible | |
1238 | : public __is_nothrow_move_constructible_impl<_Tp> | |
1239 | { }; | |
1240 | ||
f263981a PC |
1241 | template<typename _Tp, typename _Up> |
1242 | class __is_assignable_helper | |
f263981a | 1243 | { |
82b12c4b FD |
1244 | template<typename _Tp1, typename _Up1, |
1245 | typename = decltype(declval<_Tp1>() = declval<_Up1>())> | |
1246 | static true_type | |
f263981a PC |
1247 | __test(int); |
1248 | ||
1249 | template<typename, typename> | |
82b12c4b FD |
1250 | static false_type |
1251 | __test(...); | |
f263981a PC |
1252 | |
1253 | public: | |
82b12c4b | 1254 | typedef decltype(__test<_Tp, _Up>(0)) type; |
f263981a PC |
1255 | }; |
1256 | ||
1257 | /// is_assignable | |
1258 | template<typename _Tp, typename _Up> | |
1259 | struct is_assignable | |
82b12c4b | 1260 | : public __is_assignable_helper<_Tp, _Up>::type |
f263981a PC |
1261 | { }; |
1262 | ||
89898034 | 1263 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1264 | struct __is_copy_assignable_impl; |
1265 | ||
1266 | template<typename _Tp> | |
89898034 | 1267 | struct __is_copy_assignable_impl<_Tp, false> |
f263981a PC |
1268 | : public false_type { }; |
1269 | ||
1270 | template<typename _Tp> | |
89898034 | 1271 | struct __is_copy_assignable_impl<_Tp, true> |
9b3a81da | 1272 | : public is_assignable<_Tp&, const _Tp&> |
f263981a PC |
1273 | { }; |
1274 | ||
1275 | /// is_copy_assignable | |
1276 | template<typename _Tp> | |
1277 | struct is_copy_assignable | |
1278 | : public __is_copy_assignable_impl<_Tp> | |
1279 | { }; | |
1280 | ||
89898034 | 1281 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1282 | struct __is_move_assignable_impl; |
1283 | ||
1284 | template<typename _Tp> | |
89898034 | 1285 | struct __is_move_assignable_impl<_Tp, false> |
f263981a PC |
1286 | : public false_type { }; |
1287 | ||
1288 | template<typename _Tp> | |
89898034 | 1289 | struct __is_move_assignable_impl<_Tp, true> |
f263981a PC |
1290 | : public is_assignable<_Tp&, _Tp&&> |
1291 | { }; | |
1292 | ||
1293 | /// is_move_assignable | |
1294 | template<typename _Tp> | |
1295 | struct is_move_assignable | |
1296 | : public __is_move_assignable_impl<_Tp> | |
1297 | { }; | |
1298 | ||
1299 | template<typename _Tp, typename _Up> | |
1300 | struct __is_nt_assignable_impl | |
1301 | : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())> | |
1302 | { }; | |
1303 | ||
1304 | /// is_nothrow_assignable | |
1305 | template<typename _Tp, typename _Up> | |
1306 | struct is_nothrow_assignable | |
1307 | : public __and_<is_assignable<_Tp, _Up>, | |
f7632193 | 1308 | __is_nt_assignable_impl<_Tp, _Up>> |
f263981a PC |
1309 | { }; |
1310 | ||
89898034 | 1311 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1312 | struct __is_nt_copy_assignable_impl; |
1313 | ||
1314 | template<typename _Tp> | |
89898034 | 1315 | struct __is_nt_copy_assignable_impl<_Tp, false> |
f263981a PC |
1316 | : public false_type { }; |
1317 | ||
1318 | template<typename _Tp> | |
89898034 | 1319 | struct __is_nt_copy_assignable_impl<_Tp, true> |
9b3a81da | 1320 | : public is_nothrow_assignable<_Tp&, const _Tp&> |
f263981a PC |
1321 | { }; |
1322 | ||
1323 | /// is_nothrow_copy_assignable | |
1324 | template<typename _Tp> | |
1325 | struct is_nothrow_copy_assignable | |
1326 | : public __is_nt_copy_assignable_impl<_Tp> | |
1327 | { }; | |
1328 | ||
89898034 | 1329 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
f263981a PC |
1330 | struct __is_nt_move_assignable_impl; |
1331 | ||
1332 | template<typename _Tp> | |
89898034 | 1333 | struct __is_nt_move_assignable_impl<_Tp, false> |
f263981a PC |
1334 | : public false_type { }; |
1335 | ||
1336 | template<typename _Tp> | |
89898034 | 1337 | struct __is_nt_move_assignable_impl<_Tp, true> |
f263981a PC |
1338 | : public is_nothrow_assignable<_Tp&, _Tp&&> |
1339 | { }; | |
1340 | ||
1341 | /// is_nothrow_move_assignable | |
65cee9bd | 1342 | template<typename _Tp> |
f263981a PC |
1343 | struct is_nothrow_move_assignable |
1344 | : public __is_nt_move_assignable_impl<_Tp> | |
e4f32cb0 PC |
1345 | { }; |
1346 | ||
f5e523b7 VV |
1347 | /// is_trivially_constructible |
1348 | template<typename _Tp, typename... _Args> | |
1349 | struct is_trivially_constructible | |
1350 | : public __and_<is_constructible<_Tp, _Args...>, integral_constant<bool, | |
f7632193 | 1351 | __is_trivially_constructible(_Tp, _Args...)>> |
f5e523b7 | 1352 | { }; |
6a9ecd34 | 1353 | |
f5e523b7 VV |
1354 | /// is_trivially_default_constructible |
1355 | template<typename _Tp> | |
1356 | struct is_trivially_default_constructible | |
1357 | : public is_trivially_constructible<_Tp>::type | |
1358 | { }; | |
6a9ecd34 | 1359 | |
f7632193 VV |
1360 | struct __do_is_implicitly_default_constructible_impl |
1361 | { | |
1362 | template <typename _Tp> | |
1363 | static void __helper(const _Tp&); | |
1364 | ||
1365 | template <typename _Tp> | |
1366 | static true_type __test(const _Tp&, | |
1367 | decltype(__helper<const _Tp&>({}))* = 0); | |
1368 | ||
1369 | static false_type __test(...); | |
1370 | }; | |
1371 | ||
1372 | template<typename _Tp> | |
1373 | struct __is_implicitly_default_constructible_impl | |
1374 | : public __do_is_implicitly_default_constructible_impl | |
1375 | { | |
1376 | typedef decltype(__test(declval<_Tp>())) type; | |
1377 | }; | |
1378 | ||
1379 | template<typename _Tp> | |
1380 | struct __is_implicitly_default_constructible_safe | |
1381 | : public __is_implicitly_default_constructible_impl<_Tp>::type | |
1382 | { }; | |
1383 | ||
1384 | template <typename _Tp> | |
1385 | struct __is_implicitly_default_constructible | |
1386 | : public __and_<is_default_constructible<_Tp>, | |
1387 | __is_implicitly_default_constructible_safe<_Tp>> | |
1388 | { }; | |
1389 | ||
f5e523b7 VV |
1390 | /// is_trivially_copy_constructible |
1391 | template<typename _Tp> | |
1392 | struct is_trivially_copy_constructible | |
1393 | : public __and_<is_copy_constructible<_Tp>, | |
1394 | integral_constant<bool, | |
f7632193 | 1395 | __is_trivially_constructible(_Tp, const _Tp&)>> |
f5e523b7 VV |
1396 | { }; |
1397 | ||
1398 | /// is_trivially_move_constructible | |
1399 | template<typename _Tp> | |
1400 | struct is_trivially_move_constructible | |
1401 | : public __and_<is_move_constructible<_Tp>, | |
1402 | integral_constant<bool, | |
f7632193 | 1403 | __is_trivially_constructible(_Tp, _Tp&&)>> |
f5e523b7 | 1404 | { }; |
6a9ecd34 | 1405 | |
f5e523b7 VV |
1406 | /// is_trivially_assignable |
1407 | template<typename _Tp, typename _Up> | |
1408 | struct is_trivially_assignable | |
1409 | : public __and_<is_assignable<_Tp, _Up>, | |
1410 | integral_constant<bool, | |
f7632193 | 1411 | __is_trivially_assignable(_Tp, _Up)>> |
f5e523b7 | 1412 | { }; |
6a9ecd34 | 1413 | |
f5e523b7 VV |
1414 | /// is_trivially_copy_assignable |
1415 | template<typename _Tp> | |
1416 | struct is_trivially_copy_assignable | |
1417 | : public __and_<is_copy_assignable<_Tp>, | |
1418 | integral_constant<bool, | |
f7632193 | 1419 | __is_trivially_assignable(_Tp&, const _Tp&)>> |
f5e523b7 | 1420 | { }; |
6a9ecd34 | 1421 | |
f5e523b7 VV |
1422 | /// is_trivially_move_assignable |
1423 | template<typename _Tp> | |
1424 | struct is_trivially_move_assignable | |
1425 | : public __and_<is_move_assignable<_Tp>, | |
1426 | integral_constant<bool, | |
f7632193 | 1427 | __is_trivially_assignable(_Tp&, _Tp&&)>> |
f5e523b7 | 1428 | { }; |
6a9ecd34 PC |
1429 | |
1430 | /// is_trivially_destructible | |
1431 | template<typename _Tp> | |
1432 | struct is_trivially_destructible | |
1433 | : public __and_<is_destructible<_Tp>, integral_constant<bool, | |
f7632193 | 1434 | __has_trivial_destructor(_Tp)>> |
6a9ecd34 PC |
1435 | { }; |
1436 | ||
1437 | /// has_trivial_default_constructor (temporary legacy) | |
e133ace8 PC |
1438 | template<typename _Tp> |
1439 | struct has_trivial_default_constructor | |
1440 | : public integral_constant<bool, __has_trivial_constructor(_Tp)> | |
c66b93fe | 1441 | { } _GLIBCXX_DEPRECATED; |
e133ace8 | 1442 | |
6a9ecd34 | 1443 | /// has_trivial_copy_constructor (temporary legacy) |
e133ace8 PC |
1444 | template<typename _Tp> |
1445 | struct has_trivial_copy_constructor | |
1446 | : public integral_constant<bool, __has_trivial_copy(_Tp)> | |
c66b93fe | 1447 | { } _GLIBCXX_DEPRECATED; |
e133ace8 | 1448 | |
6a9ecd34 | 1449 | /// has_trivial_copy_assign (temporary legacy) |
e133ace8 | 1450 | template<typename _Tp> |
6f5e9b8d | 1451 | struct has_trivial_copy_assign |
e133ace8 | 1452 | : public integral_constant<bool, __has_trivial_assign(_Tp)> |
c66b93fe | 1453 | { } _GLIBCXX_DEPRECATED; |
e133ace8 | 1454 | |
123c516a PC |
1455 | /// has_virtual_destructor |
1456 | template<typename _Tp> | |
1457 | struct has_virtual_destructor | |
1458 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
1459 | { }; | |
1460 | ||
1461 | ||
1462 | // type property queries. | |
1463 | ||
1464 | /// alignment_of | |
1465 | template<typename _Tp> | |
1466 | struct alignment_of | |
1467 | : public integral_constant<std::size_t, __alignof__(_Tp)> { }; | |
1468 | ||
1469 | /// rank | |
1470 | template<typename> | |
1471 | struct rank | |
1472 | : public integral_constant<std::size_t, 0> { }; | |
1473 | ||
1474 | template<typename _Tp, std::size_t _Size> | |
1475 | struct rank<_Tp[_Size]> | |
1476 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1477 | ||
1478 | template<typename _Tp> | |
1479 | struct rank<_Tp[]> | |
1480 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1481 | ||
1482 | /// extent | |
1483 | template<typename, unsigned _Uint> | |
1484 | struct extent | |
1485 | : public integral_constant<std::size_t, 0> { }; | |
1486 | ||
1487 | template<typename _Tp, unsigned _Uint, std::size_t _Size> | |
1488 | struct extent<_Tp[_Size], _Uint> | |
1489 | : public integral_constant<std::size_t, | |
1490 | _Uint == 0 ? _Size : extent<_Tp, | |
1491 | _Uint - 1>::value> | |
1492 | { }; | |
1493 | ||
1494 | template<typename _Tp, unsigned _Uint> | |
1495 | struct extent<_Tp[], _Uint> | |
1496 | : public integral_constant<std::size_t, | |
1497 | _Uint == 0 ? 0 : extent<_Tp, | |
1498 | _Uint - 1>::value> | |
1499 | { }; | |
1500 | ||
1501 | ||
c0ffa2ba | 1502 | // Type relations. |
123c516a PC |
1503 | |
1504 | /// is_same | |
1505 | template<typename, typename> | |
1506 | struct is_same | |
1507 | : public false_type { }; | |
1508 | ||
1509 | template<typename _Tp> | |
1510 | struct is_same<_Tp, _Tp> | |
1511 | : public true_type { }; | |
b0302c68 | 1512 | |
939759fc | 1513 | /// is_base_of |
e133ace8 PC |
1514 | template<typename _Base, typename _Derived> |
1515 | struct is_base_of | |
1516 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1517 | { }; | |
1518 | ||
297f34d7 | 1519 | template<typename _From, typename _To, |
123c516a PC |
1520 | bool = __or_<is_void<_From>, is_function<_To>, |
1521 | is_array<_To>>::value> | |
297f34d7 | 1522 | struct __is_convertible_helper |
82b12c4b | 1523 | { typedef typename is_void<_To>::type type; }; |
297f34d7 | 1524 | |
e133ace8 | 1525 | template<typename _From, typename _To> |
b0302c68 | 1526 | class __is_convertible_helper<_From, _To, false> |
e133ace8 | 1527 | { |
82b12c4b FD |
1528 | template<typename _To1> |
1529 | static void __test_aux(_To1); | |
8e7d962a | 1530 | |
82b12c4b FD |
1531 | template<typename _From1, typename _To1, |
1532 | typename = decltype(__test_aux<_To1>(std::declval<_From1>()))> | |
1533 | static true_type | |
8e7d962a PC |
1534 | __test(int); |
1535 | ||
1536 | template<typename, typename> | |
82b12c4b FD |
1537 | static false_type |
1538 | __test(...); | |
297f34d7 | 1539 | |
e133ace8 | 1540 | public: |
82b12c4b | 1541 | typedef decltype(__test<_From, _To>(0)) type; |
e133ace8 PC |
1542 | }; |
1543 | ||
82b12c4b | 1544 | |
b0302c68 | 1545 | /// is_convertible |
e133ace8 PC |
1546 | template<typename _From, typename _To> |
1547 | struct is_convertible | |
82b12c4b | 1548 | : public __is_convertible_helper<_From, _To>::type |
e133ace8 PC |
1549 | { }; |
1550 | ||
fd735b6a | 1551 | |
c0ffa2ba | 1552 | // Const-volatile modifications. |
7b50cdef | 1553 | |
123c516a | 1554 | /// remove_const |
7b50cdef | 1555 | template<typename _Tp> |
123c516a PC |
1556 | struct remove_const |
1557 | { typedef _Tp type; }; | |
7b50cdef | 1558 | |
123c516a PC |
1559 | template<typename _Tp> |
1560 | struct remove_const<_Tp const> | |
1561 | { typedef _Tp type; }; | |
1562 | ||
1563 | /// remove_volatile | |
1564 | template<typename _Tp> | |
1565 | struct remove_volatile | |
1566 | { typedef _Tp type; }; | |
7b50cdef | 1567 | |
123c516a PC |
1568 | template<typename _Tp> |
1569 | struct remove_volatile<_Tp volatile> | |
1570 | { typedef _Tp type; }; | |
1571 | ||
1572 | /// remove_cv | |
1573 | template<typename _Tp> | |
1574 | struct remove_cv | |
1575 | { | |
1576 | typedef typename | |
1577 | remove_const<typename remove_volatile<_Tp>::type>::type type; | |
1578 | }; | |
1579 | ||
1580 | /// add_const | |
1581 | template<typename _Tp> | |
1582 | struct add_const | |
1583 | { typedef _Tp const type; }; | |
1584 | ||
1585 | /// add_volatile | |
1586 | template<typename _Tp> | |
1587 | struct add_volatile | |
1588 | { typedef _Tp volatile type; }; | |
1589 | ||
1590 | /// add_cv | |
1591 | template<typename _Tp> | |
1592 | struct add_cv | |
1593 | { | |
1594 | typedef typename | |
1595 | add_const<typename add_volatile<_Tp>::type>::type type; | |
1596 | }; | |
7b50cdef | 1597 | |
4457e88c | 1598 | #if __cplusplus > 201103L |
a15f7cb8 ESR |
1599 | |
1600 | #define __cpp_lib_transformation_trait_aliases 201304 | |
1601 | ||
4457e88c JW |
1602 | /// Alias template for remove_const |
1603 | template<typename _Tp> | |
1604 | using remove_const_t = typename remove_const<_Tp>::type; | |
1605 | ||
1606 | /// Alias template for remove_volatile | |
1607 | template<typename _Tp> | |
1608 | using remove_volatile_t = typename remove_volatile<_Tp>::type; | |
1609 | ||
1610 | /// Alias template for remove_cv | |
1611 | template<typename _Tp> | |
1612 | using remove_cv_t = typename remove_cv<_Tp>::type; | |
1613 | ||
1614 | /// Alias template for add_const | |
1615 | template<typename _Tp> | |
1616 | using add_const_t = typename add_const<_Tp>::type; | |
1617 | ||
1618 | /// Alias template for add_volatile | |
1619 | template<typename _Tp> | |
1620 | using add_volatile_t = typename add_volatile<_Tp>::type; | |
1621 | ||
1622 | /// Alias template for add_cv | |
1623 | template<typename _Tp> | |
1624 | using add_cv_t = typename add_cv<_Tp>::type; | |
1625 | #endif | |
7b50cdef | 1626 | |
123c516a | 1627 | // Reference transformations. |
7b50cdef | 1628 | |
123c516a PC |
1629 | /// remove_reference |
1630 | template<typename _Tp> | |
1631 | struct remove_reference | |
1632 | { typedef _Tp type; }; | |
7b50cdef | 1633 | |
123c516a PC |
1634 | template<typename _Tp> |
1635 | struct remove_reference<_Tp&> | |
1636 | { typedef _Tp type; }; | |
7b50cdef | 1637 | |
123c516a PC |
1638 | template<typename _Tp> |
1639 | struct remove_reference<_Tp&&> | |
1640 | { typedef _Tp type; }; | |
1641 | ||
89898034 | 1642 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
123c516a PC |
1643 | struct __add_lvalue_reference_helper |
1644 | { typedef _Tp type; }; | |
7b50cdef | 1645 | |
5e108459 | 1646 | template<typename _Tp> |
89898034 | 1647 | struct __add_lvalue_reference_helper<_Tp, true> |
123c516a | 1648 | { typedef _Tp& type; }; |
5e108459 | 1649 | |
123c516a | 1650 | /// add_lvalue_reference |
5e108459 | 1651 | template<typename _Tp> |
123c516a PC |
1652 | struct add_lvalue_reference |
1653 | : public __add_lvalue_reference_helper<_Tp> | |
1654 | { }; | |
1655 | ||
89898034 | 1656 | template<typename _Tp, bool = __is_referenceable<_Tp>::value> |
123c516a PC |
1657 | struct __add_rvalue_reference_helper |
1658 | { typedef _Tp type; }; | |
5e108459 PC |
1659 | |
1660 | template<typename _Tp> | |
123c516a PC |
1661 | struct __add_rvalue_reference_helper<_Tp, true> |
1662 | { typedef _Tp&& type; }; | |
5e108459 | 1663 | |
123c516a | 1664 | /// add_rvalue_reference |
5e108459 | 1665 | template<typename _Tp> |
123c516a PC |
1666 | struct add_rvalue_reference |
1667 | : public __add_rvalue_reference_helper<_Tp> | |
1668 | { }; | |
5e108459 | 1669 | |
4457e88c JW |
1670 | #if __cplusplus > 201103L |
1671 | /// Alias template for remove_reference | |
1672 | template<typename _Tp> | |
1673 | using remove_reference_t = typename remove_reference<_Tp>::type; | |
1674 | ||
1675 | /// Alias template for add_lvalue_reference | |
1676 | template<typename _Tp> | |
1677 | using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; | |
1678 | ||
1679 | /// Alias template for add_rvalue_reference | |
1680 | template<typename _Tp> | |
1681 | using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; | |
1682 | #endif | |
7b50cdef | 1683 | |
c0ffa2ba | 1684 | // Sign modifications. |
123c516a | 1685 | |
7b50cdef BK |
1686 | // Utility for constructing identically cv-qualified types. |
1687 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1688 | struct __cv_selector; | |
1689 | ||
1690 | template<typename _Unqualified> | |
1691 | struct __cv_selector<_Unqualified, false, false> | |
1692 | { typedef _Unqualified __type; }; | |
1693 | ||
1694 | template<typename _Unqualified> | |
1695 | struct __cv_selector<_Unqualified, false, true> | |
1696 | { typedef volatile _Unqualified __type; }; | |
1697 | ||
1698 | template<typename _Unqualified> | |
1699 | struct __cv_selector<_Unqualified, true, false> | |
1700 | { typedef const _Unqualified __type; }; | |
1701 | ||
1702 | template<typename _Unqualified> | |
1703 | struct __cv_selector<_Unqualified, true, true> | |
1704 | { typedef const volatile _Unqualified __type; }; | |
1705 | ||
1706 | template<typename _Qualified, typename _Unqualified, | |
1707 | bool _IsConst = is_const<_Qualified>::value, | |
1708 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1709 | class __match_cv_qualifiers |
7b50cdef | 1710 | { |
7b50cdef BK |
1711 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1712 | ||
1713 | public: | |
1714 | typedef typename __match::__type __type; | |
1715 | }; | |
1716 | ||
7b50cdef BK |
1717 | // Utility for finding the unsigned versions of signed integral types. |
1718 | template<typename _Tp> | |
e133ace8 PC |
1719 | struct __make_unsigned |
1720 | { typedef _Tp __type; }; | |
7b50cdef BK |
1721 | |
1722 | template<> | |
1723 | struct __make_unsigned<char> | |
1724 | { typedef unsigned char __type; }; | |
1725 | ||
1726 | template<> | |
1727 | struct __make_unsigned<signed char> | |
1728 | { typedef unsigned char __type; }; | |
1729 | ||
7b50cdef BK |
1730 | template<> |
1731 | struct __make_unsigned<short> | |
1732 | { typedef unsigned short __type; }; | |
1733 | ||
1734 | template<> | |
1735 | struct __make_unsigned<int> | |
1736 | { typedef unsigned int __type; }; | |
1737 | ||
1738 | template<> | |
1739 | struct __make_unsigned<long> | |
1740 | { typedef unsigned long __type; }; | |
1741 | ||
1742 | template<> | |
1743 | struct __make_unsigned<long long> | |
1744 | { typedef unsigned long long __type; }; | |
1745 | ||
c0eef1c8 JW |
1746 | #if defined(_GLIBCXX_USE_WCHAR_T) && !defined(__WCHAR_UNSIGNED__) |
1747 | template<> | |
1748 | struct __make_unsigned<wchar_t> : __make_unsigned<__WCHAR_TYPE__> | |
1749 | { }; | |
1750 | #endif | |
1751 | ||
78a7c317 DD |
1752 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
1753 | template<> | |
1754 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0> | |
1755 | { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1756 | #endif | |
1757 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
1758 | template<> | |
1759 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1> | |
1760 | { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1761 | #endif | |
1762 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
6d585f01 | 1763 | template<> |
78a7c317 DD |
1764 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2> |
1765 | { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1766 | #endif | |
1767 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
1768 | template<> | |
1769 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3> | |
1770 | { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1771 | #endif |
1772 | ||
7b50cdef BK |
1773 | // Select between integral and enum: not possible to be both. |
1774 | template<typename _Tp, | |
1775 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1776 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1777 | class __make_unsigned_selector; |
1778 | ||
7b50cdef | 1779 | template<typename _Tp> |
b0302c68 | 1780 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1781 | { |
7b50cdef BK |
1782 | typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt; |
1783 | typedef typename __unsignedt::__type __unsigned_type; | |
1784 | typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned; | |
1785 | ||
1786 | public: | |
1787 | typedef typename __cv_unsigned::__type __type; | |
1788 | }; | |
1789 | ||
7b50cdef | 1790 | template<typename _Tp> |
b0302c68 | 1791 | class __make_unsigned_selector<_Tp, false, true> |
7b50cdef | 1792 | { |
a0230468 MM |
1793 | // With -fshort-enums, an enum may be as small as a char. |
1794 | typedef unsigned char __smallest; | |
1795 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1796 | static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short); | |
ce2e6349 | 1797 | static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int); |
73d81d3a JW |
1798 | static const bool __b3 = sizeof(_Tp) <= sizeof(unsigned long); |
1799 | typedef conditional<__b3, unsigned long, unsigned long long> __cond3; | |
1800 | typedef typename __cond3::type __cond3_type; | |
1801 | typedef conditional<__b2, unsigned int, __cond3_type> __cond2; | |
a0230468 MM |
1802 | typedef typename __cond2::type __cond2_type; |
1803 | typedef conditional<__b1, unsigned short, __cond2_type> __cond1; | |
1804 | typedef typename __cond1::type __cond1_type; | |
7b50cdef | 1805 | |
73d81d3a JW |
1806 | typedef typename conditional<__b0, __smallest, __cond1_type>::type |
1807 | __unsigned_type; | |
1808 | typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned; | |
1809 | ||
7b50cdef | 1810 | public: |
73d81d3a | 1811 | typedef typename __cv_unsigned::__type __type; |
7b50cdef BK |
1812 | }; |
1813 | ||
7b50cdef BK |
1814 | // Given an integral/enum type, return the corresponding unsigned |
1815 | // integer type. | |
5b9daa7e BK |
1816 | // Primary template. |
1817 | /// make_unsigned | |
7b50cdef BK |
1818 | template<typename _Tp> |
1819 | struct make_unsigned | |
1820 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; | |
1821 | ||
1822 | // Integral, but don't define. | |
1823 | template<> | |
1824 | struct make_unsigned<bool>; | |
1825 | ||
1826 | ||
1827 | // Utility for finding the signed versions of unsigned integral types. | |
1828 | template<typename _Tp> | |
e133ace8 PC |
1829 | struct __make_signed |
1830 | { typedef _Tp __type; }; | |
7b50cdef BK |
1831 | |
1832 | template<> | |
1833 | struct __make_signed<char> | |
1834 | { typedef signed char __type; }; | |
1835 | ||
1836 | template<> | |
1837 | struct __make_signed<unsigned char> | |
1838 | { typedef signed char __type; }; | |
1839 | ||
7b50cdef BK |
1840 | template<> |
1841 | struct __make_signed<unsigned short> | |
1842 | { typedef signed short __type; }; | |
1843 | ||
1844 | template<> | |
1845 | struct __make_signed<unsigned int> | |
1846 | { typedef signed int __type; }; | |
1847 | ||
1848 | template<> | |
1849 | struct __make_signed<unsigned long> | |
1850 | { typedef signed long __type; }; | |
1851 | ||
1852 | template<> | |
1853 | struct __make_signed<unsigned long long> | |
1854 | { typedef signed long long __type; }; | |
1855 | ||
c0eef1c8 JW |
1856 | #if defined(_GLIBCXX_USE_WCHAR_T) && defined(__WCHAR_UNSIGNED__) |
1857 | template<> | |
1858 | struct __make_signed<wchar_t> : __make_signed<__WCHAR_TYPE__> | |
1859 | { }; | |
1860 | #endif | |
1861 | ||
1862 | #ifdef _GLIBCXX_USE_C99_STDINT_TR1 | |
1863 | template<> | |
1864 | struct __make_signed<char16_t> : __make_signed<uint_least16_t> | |
1865 | { }; | |
1866 | template<> | |
1867 | struct __make_signed<char32_t> : __make_signed<uint_least32_t> | |
1868 | { }; | |
1869 | #endif | |
1870 | ||
78a7c317 DD |
1871 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
1872 | template<> | |
1873 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0> | |
1874 | { typedef __GLIBCXX_TYPE_INT_N_0 __type; }; | |
1875 | #endif | |
1876 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
1877 | template<> | |
1878 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1> | |
1879 | { typedef __GLIBCXX_TYPE_INT_N_1 __type; }; | |
1880 | #endif | |
1881 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
1882 | template<> | |
1883 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2> | |
1884 | { typedef __GLIBCXX_TYPE_INT_N_2 __type; }; | |
1885 | #endif | |
1886 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
6d585f01 | 1887 | template<> |
78a7c317 DD |
1888 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3> |
1889 | { typedef __GLIBCXX_TYPE_INT_N_3 __type; }; | |
6d585f01 PC |
1890 | #endif |
1891 | ||
fb8ffd10 | 1892 | // Select between integral and enum: not possible to be both. |
7b50cdef BK |
1893 | template<typename _Tp, |
1894 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1895 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1896 | class __make_signed_selector; |
1897 | ||
7b50cdef | 1898 | template<typename _Tp> |
b0302c68 | 1899 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1900 | { |
7b50cdef BK |
1901 | typedef __make_signed<typename remove_cv<_Tp>::type> __signedt; |
1902 | typedef typename __signedt::__type __signed_type; | |
1903 | typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed; | |
1904 | ||
1905 | public: | |
1906 | typedef typename __cv_signed::__type __type; | |
1907 | }; | |
1908 | ||
7b50cdef | 1909 | template<typename _Tp> |
b0302c68 | 1910 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1911 | { |
73d81d3a | 1912 | typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type; |
7b50cdef BK |
1913 | |
1914 | public: | |
73d81d3a | 1915 | typedef typename __make_signed_selector<__unsigned_type>::__type __type; |
7b50cdef BK |
1916 | }; |
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 BK |
1922 | template<typename _Tp> |
1923 | struct make_signed | |
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 | |
1991 | : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> | |
1992 | { }; | |
1993 | ||
1994 | /// add_pointer | |
89898034 DK |
1995 | template<typename _Tp, bool = __or_<__is_referenceable<_Tp>, |
1996 | is_void<_Tp>>::value> | |
1997 | struct __add_pointer_helper | |
1998 | { typedef _Tp type; }; | |
1999 | ||
123c516a | 2000 | template<typename _Tp> |
89898034 | 2001 | struct __add_pointer_helper<_Tp, true> |
123c516a PC |
2002 | { typedef typename remove_reference<_Tp>::type* type; }; |
2003 | ||
89898034 DK |
2004 | template<typename _Tp> |
2005 | struct add_pointer | |
2006 | : public __add_pointer_helper<_Tp> | |
2007 | { }; | |
2008 | ||
4457e88c JW |
2009 | #if __cplusplus > 201103L |
2010 | /// Alias template for remove_pointer | |
2011 | template<typename _Tp> | |
2012 | using remove_pointer_t = typename remove_pointer<_Tp>::type; | |
2013 | ||
2014 | /// Alias template for add_pointer | |
2015 | template<typename _Tp> | |
2016 | using add_pointer_t = typename add_pointer<_Tp>::type; | |
2017 | #endif | |
123c516a PC |
2018 | |
2019 | template<std::size_t _Len> | |
2020 | struct __aligned_storage_msa | |
2021 | { | |
2022 | union __type | |
2023 | { | |
2024 | unsigned char __data[_Len]; | |
2025 | struct __attribute__((__aligned__)) { } __align; | |
2026 | }; | |
2027 | }; | |
2028 | ||
2029 | /** | |
2030 | * @brief Alignment type. | |
2031 | * | |
2032 | * The value of _Align is a default-alignment which shall be the | |
2033 | * most stringent alignment requirement for any C++ object type | |
2034 | * whose size is no greater than _Len (3.9). The member typedef | |
2035 | * type shall be a POD type suitable for use as uninitialized | |
2036 | * storage for any object whose size is at most _Len and whose | |
2037 | * alignment is a divisor of _Align. | |
2038 | */ | |
2039 | template<std::size_t _Len, std::size_t _Align = | |
2040 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2041 | struct aligned_storage | |
2042 | { | |
2043 | union type | |
2044 | { | |
2045 | unsigned char __data[_Len]; | |
2046 | struct __attribute__((__aligned__((_Align)))) { } __align; | |
2047 | }; | |
2048 | }; | |
2049 | ||
d3718027 RS |
2050 | template <typename... _Types> |
2051 | struct __strictest_alignment | |
2052 | { | |
2053 | static const size_t _S_alignment = 0; | |
2054 | static const size_t _S_size = 0; | |
2055 | }; | |
2056 | ||
2057 | template <typename _Tp, typename... _Types> | |
2058 | struct __strictest_alignment<_Tp, _Types...> | |
2059 | { | |
2060 | static const size_t _S_alignment = | |
2061 | alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment | |
2062 | ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment; | |
2063 | static const size_t _S_size = | |
2064 | sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size | |
2065 | ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size; | |
2066 | }; | |
2067 | ||
2068 | /** | |
2069 | * @brief Provide aligned storage for types. | |
2070 | * | |
2071 | * [meta.trans.other] | |
2072 | * | |
2073 | * Provides aligned storage for any of the provided types of at | |
2074 | * least size _Len. | |
2075 | * | |
2076 | * @see aligned_storage | |
2077 | */ | |
2078 | template <size_t _Len, typename... _Types> | |
2079 | struct aligned_union | |
2080 | { | |
2081 | private: | |
2082 | static_assert(sizeof...(_Types) != 0, "At least one type is required"); | |
2083 | ||
2084 | using __strictest = __strictest_alignment<_Types...>; | |
2085 | static const size_t _S_len = _Len > __strictest::_S_size | |
2086 | ? _Len : __strictest::_S_size; | |
2087 | public: | |
2088 | /// The value of the strictest alignment of _Types. | |
2089 | static const size_t alignment_value = __strictest::_S_alignment; | |
2090 | /// The storage. | |
2091 | typedef typename aligned_storage<_S_len, alignment_value>::type type; | |
2092 | }; | |
2093 | ||
2094 | template <size_t _Len, typename... _Types> | |
2095 | const size_t aligned_union<_Len, _Types...>::alignment_value; | |
123c516a PC |
2096 | |
2097 | // Decay trait for arrays and functions, used for perfect forwarding | |
2098 | // in make_pair, make_tuple, etc. | |
2099 | template<typename _Up, | |
2100 | bool _IsArray = is_array<_Up>::value, | |
2101 | bool _IsFunction = is_function<_Up>::value> | |
2102 | struct __decay_selector; | |
2103 | ||
2104 | // NB: DR 705. | |
2105 | template<typename _Up> | |
2106 | struct __decay_selector<_Up, false, false> | |
2107 | { typedef typename remove_cv<_Up>::type __type; }; | |
2108 | ||
2109 | template<typename _Up> | |
2110 | struct __decay_selector<_Up, true, false> | |
2111 | { typedef typename remove_extent<_Up>::type* __type; }; | |
2112 | ||
2113 | template<typename _Up> | |
2114 | struct __decay_selector<_Up, false, true> | |
2115 | { typedef typename add_pointer<_Up>::type __type; }; | |
2116 | ||
2117 | /// decay | |
2118 | template<typename _Tp> | |
2119 | class decay | |
2120 | { | |
2121 | typedef typename remove_reference<_Tp>::type __remove_type; | |
2122 | ||
2123 | public: | |
2124 | typedef typename __decay_selector<__remove_type>::__type type; | |
2125 | }; | |
2126 | ||
2127 | template<typename _Tp> | |
2128 | class reference_wrapper; | |
2129 | ||
2130 | // Helper which adds a reference to a type when given a reference_wrapper | |
2131 | template<typename _Tp> | |
2132 | struct __strip_reference_wrapper | |
2133 | { | |
2134 | typedef _Tp __type; | |
2135 | }; | |
2136 | ||
2137 | template<typename _Tp> | |
2138 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
2139 | { | |
2140 | typedef _Tp& __type; | |
2141 | }; | |
2142 | ||
123c516a PC |
2143 | template<typename _Tp> |
2144 | struct __decay_and_strip | |
2145 | { | |
2146 | typedef typename __strip_reference_wrapper< | |
2147 | typename decay<_Tp>::type>::__type __type; | |
2148 | }; | |
2149 | ||
2150 | ||
123c516a | 2151 | // Primary template. |
13901e4b | 2152 | /// Define a member typedef @c type only if a boolean constant is true. |
123c516a PC |
2153 | template<bool, typename _Tp = void> |
2154 | struct enable_if | |
2155 | { }; | |
2156 | ||
2157 | // Partial specialization for true. | |
2158 | template<typename _Tp> | |
2159 | struct enable_if<true, _Tp> | |
2160 | { typedef _Tp type; }; | |
2161 | ||
23df8534 JW |
2162 | template<typename... _Cond> |
2163 | using _Require = typename enable_if<__and_<_Cond...>::value>::type; | |
123c516a | 2164 | |
123c516a | 2165 | // Primary template. |
13901e4b | 2166 | /// Define a member typedef @c type to one of two argument types. |
123c516a PC |
2167 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2168 | struct conditional | |
2169 | { typedef _Iftrue type; }; | |
2170 | ||
2171 | // Partial specialization for false. | |
2172 | template<typename _Iftrue, typename _Iffalse> | |
2173 | struct conditional<false, _Iftrue, _Iffalse> | |
2174 | { typedef _Iffalse type; }; | |
2175 | ||
5b9daa7e | 2176 | /// common_type |
cfa9a96b CF |
2177 | template<typename... _Tp> |
2178 | struct common_type; | |
2179 | ||
c0ffa2ba | 2180 | // Sfinae-friendly common_type implementation: |
b3618b71 DK |
2181 | |
2182 | struct __do_common_type_impl | |
2183 | { | |
2184 | template<typename _Tp, typename _Up> | |
6c5173c0 | 2185 | static __success_type<typename decay<decltype |
fe4e4e3b | 2186 | (true ? std::declval<_Tp>() |
6c5173c0 | 2187 | : std::declval<_Up>())>::type> _S_test(int); |
b3618b71 DK |
2188 | |
2189 | template<typename, typename> | |
2190 | static __failure_type _S_test(...); | |
2191 | }; | |
2192 | ||
2193 | template<typename _Tp, typename _Up> | |
2194 | struct __common_type_impl | |
2195 | : private __do_common_type_impl | |
2196 | { | |
2197 | typedef decltype(_S_test<_Tp, _Up>(0)) type; | |
2198 | }; | |
2199 | ||
2200 | struct __do_member_type_wrapper | |
2201 | { | |
2202 | template<typename _Tp> | |
2203 | static __success_type<typename _Tp::type> _S_test(int); | |
2204 | ||
2205 | template<typename> | |
2206 | static __failure_type _S_test(...); | |
2207 | }; | |
2208 | ||
2209 | template<typename _Tp> | |
2210 | struct __member_type_wrapper | |
2211 | : private __do_member_type_wrapper | |
2212 | { | |
2213 | typedef decltype(_S_test<_Tp>(0)) type; | |
2214 | }; | |
2215 | ||
2216 | template<typename _CTp, typename... _Args> | |
2217 | struct __expanded_common_type_wrapper | |
2218 | { | |
2219 | typedef common_type<typename _CTp::type, _Args...> type; | |
2220 | }; | |
2221 | ||
2222 | template<typename... _Args> | |
2223 | struct __expanded_common_type_wrapper<__failure_type, _Args...> | |
2224 | { typedef __failure_type type; }; | |
2225 | ||
cfa9a96b CF |
2226 | template<typename _Tp> |
2227 | struct common_type<_Tp> | |
6c5173c0 | 2228 | { typedef typename decay<_Tp>::type type; }; |
cfa9a96b CF |
2229 | |
2230 | template<typename _Tp, typename _Up> | |
7274deff | 2231 | struct common_type<_Tp, _Up> |
b3618b71 DK |
2232 | : public __common_type_impl<_Tp, _Up>::type |
2233 | { }; | |
cfa9a96b CF |
2234 | |
2235 | template<typename _Tp, typename _Up, typename... _Vp> | |
2236 | struct common_type<_Tp, _Up, _Vp...> | |
b3618b71 DK |
2237 | : public __expanded_common_type_wrapper<typename __member_type_wrapper< |
2238 | common_type<_Tp, _Up>>::type, _Vp...>::type | |
2239 | { }; | |
7274deff | 2240 | |
13901e4b | 2241 | /// The underlying type of an enum. |
a47407f6 PC |
2242 | template<typename _Tp> |
2243 | struct underlying_type | |
2244 | { | |
2245 | typedef __underlying_type(_Tp) type; | |
2246 | }; | |
123c516a | 2247 | |
7274deff PC |
2248 | template<typename _Tp> |
2249 | struct __declval_protector | |
2250 | { | |
2251 | static const bool __stop = false; | |
2252 | static typename add_rvalue_reference<_Tp>::type __delegate(); | |
2253 | }; | |
2254 | ||
2255 | template<typename _Tp> | |
2256 | inline typename add_rvalue_reference<_Tp>::type | |
e4f32cb0 | 2257 | declval() noexcept |
7274deff PC |
2258 | { |
2259 | static_assert(__declval_protector<_Tp>::__stop, | |
2260 | "declval() must not be used!"); | |
2261 | return __declval_protector<_Tp>::__delegate(); | |
2262 | } | |
1041daba | 2263 | |
be7f7822 JW |
2264 | /// result_of |
2265 | template<typename _Signature> | |
2266 | class result_of; | |
2267 | ||
c0ffa2ba | 2268 | // Sfinae-friendly result_of implementation: |
83ddb39f | 2269 | |
a15f7cb8 ESR |
2270 | #define __cpp_lib_result_of_sfinae 201210 |
2271 | ||
93e95400 JW |
2272 | struct __invoke_memfun_ref { }; |
2273 | struct __invoke_memfun_deref { }; | |
2274 | struct __invoke_memobj_ref { }; | |
2275 | struct __invoke_memobj_deref { }; | |
2276 | struct __invoke_other { }; | |
2277 | ||
2278 | // Associate a tag type with a specialization of __success_type. | |
2279 | template<typename _Tp, typename _Tag> | |
2280 | struct __result_of_success : __success_type<_Tp> | |
2281 | { using __invoke_type = _Tag; }; | |
2282 | ||
83ddb39f DK |
2283 | // [func.require] paragraph 1 bullet 1: |
2284 | struct __result_of_memfun_ref_impl | |
2285 | { | |
2286 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2287 | static __result_of_success<decltype( |
83ddb39f | 2288 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2289 | ), __invoke_memfun_ref> _S_test(int); |
83ddb39f DK |
2290 | |
2291 | template<typename...> | |
2292 | static __failure_type _S_test(...); | |
2293 | }; | |
2294 | ||
2295 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2296 | struct __result_of_memfun_ref | |
2297 | : private __result_of_memfun_ref_impl | |
2298 | { | |
2299 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2300 | }; | |
2301 | ||
2302 | // [func.require] paragraph 1 bullet 2: | |
2303 | struct __result_of_memfun_deref_impl | |
2304 | { | |
2305 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2306 | static __result_of_success<decltype( |
83ddb39f | 2307 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2308 | ), __invoke_memfun_deref> _S_test(int); |
83ddb39f DK |
2309 | |
2310 | template<typename...> | |
2311 | static __failure_type _S_test(...); | |
2312 | }; | |
2313 | ||
2314 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2315 | struct __result_of_memfun_deref | |
2316 | : private __result_of_memfun_deref_impl | |
2317 | { | |
2318 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
2319 | }; | |
2320 | ||
2321 | // [func.require] paragraph 1 bullet 3: | |
2322 | struct __result_of_memobj_ref_impl | |
2323 | { | |
2324 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2325 | static __result_of_success<decltype( |
83ddb39f | 2326 | std::declval<_Tp1>().*std::declval<_Fp>() |
93e95400 | 2327 | ), __invoke_memobj_ref> _S_test(int); |
83ddb39f DK |
2328 | |
2329 | template<typename, typename> | |
2330 | static __failure_type _S_test(...); | |
2331 | }; | |
2332 | ||
2333 | template<typename _MemPtr, typename _Arg> | |
2334 | struct __result_of_memobj_ref | |
2335 | : private __result_of_memobj_ref_impl | |
2336 | { | |
2337 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2338 | }; | |
2339 | ||
2340 | // [func.require] paragraph 1 bullet 4: | |
2341 | struct __result_of_memobj_deref_impl | |
2342 | { | |
2343 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2344 | static __result_of_success<decltype( |
83ddb39f | 2345 | (*std::declval<_Tp1>()).*std::declval<_Fp>() |
93e95400 | 2346 | ), __invoke_memobj_deref> _S_test(int); |
83ddb39f DK |
2347 | |
2348 | template<typename, typename> | |
2349 | static __failure_type _S_test(...); | |
2350 | }; | |
2351 | ||
be7f7822 | 2352 | template<typename _MemPtr, typename _Arg> |
83ddb39f DK |
2353 | struct __result_of_memobj_deref |
2354 | : private __result_of_memobj_deref_impl | |
2355 | { | |
2356 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
2357 | }; | |
2358 | ||
2359 | template<typename _MemPtr, typename _Arg> | |
2360 | struct __result_of_memobj; | |
be7f7822 JW |
2361 | |
2362 | template<typename _Res, typename _Class, typename _Arg> | |
83ddb39f | 2363 | struct __result_of_memobj<_Res _Class::*, _Arg> |
be7f7822 | 2364 | { |
83ddb39f DK |
2365 | typedef typename remove_cv<typename remove_reference< |
2366 | _Arg>::type>::type _Argval; | |
2367 | typedef _Res _Class::* _MemPtr; | |
2368 | typedef typename conditional<__or_<is_same<_Argval, _Class>, | |
2369 | is_base_of<_Class, _Argval>>::value, | |
2370 | __result_of_memobj_ref<_MemPtr, _Arg>, | |
2371 | __result_of_memobj_deref<_MemPtr, _Arg> | |
2372 | >::type::type type; | |
be7f7822 JW |
2373 | }; |
2374 | ||
83ddb39f DK |
2375 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2376 | struct __result_of_memfun; | |
be7f7822 JW |
2377 | |
2378 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
83ddb39f | 2379 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
be7f7822 | 2380 | { |
83ddb39f DK |
2381 | typedef typename remove_cv<typename remove_reference< |
2382 | _Arg>::type>::type _Argval; | |
2383 | typedef _Res _Class::* _MemPtr; | |
2384 | typedef typename conditional<__or_<is_same<_Argval, _Class>, | |
2385 | is_base_of<_Class, _Argval>>::value, | |
2386 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, | |
2387 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> | |
2388 | >::type::type type; | |
be7f7822 JW |
2389 | }; |
2390 | ||
93e95400 JW |
2391 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
2392 | // 2219. INVOKE-ing a pointer to member with a reference_wrapper | |
2393 | // as the object expression | |
93e95400 JW |
2394 | |
2395 | template<typename _Res, typename _Class, typename _Arg> | |
2396 | struct __result_of_memobj<_Res _Class::*, reference_wrapper<_Arg>> | |
f3d7dd52 JW |
2397 | : __result_of_memobj_ref<_Res _Class::*, _Arg&> |
2398 | { }; | |
93e95400 JW |
2399 | |
2400 | template<typename _Res, typename _Class, typename _Arg> | |
2401 | struct __result_of_memobj<_Res _Class::*, reference_wrapper<_Arg>&> | |
f3d7dd52 JW |
2402 | : __result_of_memobj_ref<_Res _Class::*, _Arg&> |
2403 | { }; | |
2404 | ||
2405 | template<typename _Res, typename _Class, typename _Arg> | |
2406 | struct __result_of_memobj<_Res _Class::*, const reference_wrapper<_Arg>&> | |
2407 | : __result_of_memobj_ref<_Res _Class::*, _Arg&> | |
93e95400 JW |
2408 | { }; |
2409 | ||
2410 | template<typename _Res, typename _Class, typename _Arg> | |
2411 | struct __result_of_memobj<_Res _Class::*, reference_wrapper<_Arg>&&> | |
f3d7dd52 JW |
2412 | : __result_of_memobj_ref<_Res _Class::*, _Arg&> |
2413 | { }; | |
2414 | ||
2415 | template<typename _Res, typename _Class, typename _Arg> | |
2416 | struct __result_of_memobj<_Res _Class::*, const reference_wrapper<_Arg>&&> | |
2417 | : __result_of_memobj_ref<_Res _Class::*, _Arg&> | |
93e95400 JW |
2418 | { }; |
2419 | ||
2420 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
2421 | struct __result_of_memfun<_Res _Class::*, reference_wrapper<_Arg>, _Args...> | |
f3d7dd52 JW |
2422 | : __result_of_memfun_ref<_Res _Class::*, _Arg&, _Args...> |
2423 | { }; | |
93e95400 JW |
2424 | |
2425 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
2426 | struct __result_of_memfun<_Res _Class::*, reference_wrapper<_Arg>&, | |
2427 | _Args...> | |
f3d7dd52 JW |
2428 | : __result_of_memfun_ref<_Res _Class::*, _Arg&, _Args...> |
2429 | { }; | |
2430 | ||
2431 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
2432 | struct __result_of_memfun<_Res _Class::*, const reference_wrapper<_Arg>&, | |
2433 | _Args...> | |
2434 | : __result_of_memfun_ref<_Res _Class::*, _Arg&, _Args...> | |
93e95400 JW |
2435 | { }; |
2436 | ||
2437 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
2438 | struct __result_of_memfun<_Res _Class::*, reference_wrapper<_Arg>&&, | |
2439 | _Args...> | |
f3d7dd52 JW |
2440 | : __result_of_memfun_ref<_Res _Class::*, _Arg&, _Args...> |
2441 | { }; | |
2442 | ||
2443 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
2444 | struct __result_of_memfun<_Res _Class::*, const reference_wrapper<_Arg>&&, | |
2445 | _Args...> | |
2446 | : __result_of_memfun_ref<_Res _Class::*, _Arg&, _Args...> | |
93e95400 JW |
2447 | { }; |
2448 | ||
be7f7822 | 2449 | template<bool, bool, typename _Functor, typename... _ArgTypes> |
83ddb39f | 2450 | struct __result_of_impl |
be7f7822 | 2451 | { |
83ddb39f | 2452 | typedef __failure_type type; |
be7f7822 JW |
2453 | }; |
2454 | ||
2455 | template<typename _MemPtr, typename _Arg> | |
83ddb39f DK |
2456 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
2457 | : public __result_of_memobj<typename decay<_MemPtr>::type, _Arg> | |
c4db9a77 | 2458 | { }; |
be7f7822 | 2459 | |
83ddb39f DK |
2460 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2461 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> | |
2462 | : public __result_of_memfun<typename decay<_MemPtr>::type, _Arg, _Args...> | |
c4db9a77 | 2463 | { }; |
be7f7822 | 2464 | |
83ddb39f DK |
2465 | // [func.require] paragraph 1 bullet 5: |
2466 | struct __result_of_other_impl | |
2467 | { | |
2468 | template<typename _Fn, typename... _Args> | |
93e95400 | 2469 | static __result_of_success<decltype( |
83ddb39f | 2470 | std::declval<_Fn>()(std::declval<_Args>()...) |
93e95400 | 2471 | ), __invoke_other> _S_test(int); |
83ddb39f DK |
2472 | |
2473 | template<typename...> | |
2474 | static __failure_type _S_test(...); | |
2475 | }; | |
2476 | ||
be7f7822 | 2477 | template<typename _Functor, typename... _ArgTypes> |
83ddb39f DK |
2478 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2479 | : private __result_of_other_impl | |
be7f7822 | 2480 | { |
83ddb39f | 2481 | typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
be7f7822 JW |
2482 | }; |
2483 | ||
83ddb39f DK |
2484 | template<typename _Functor, typename... _ArgTypes> |
2485 | struct result_of<_Functor(_ArgTypes...)> | |
2486 | : public __result_of_impl< | |
2487 | is_member_object_pointer< | |
2488 | typename remove_reference<_Functor>::type | |
2489 | >::value, | |
2490 | is_member_function_pointer< | |
2491 | typename remove_reference<_Functor>::type | |
2492 | >::value, | |
2493 | _Functor, _ArgTypes... | |
2494 | >::type | |
2495 | { }; | |
c0ffa2ba | 2496 | |
4457e88c JW |
2497 | #if __cplusplus > 201103L |
2498 | /// Alias template for aligned_storage | |
2499 | template<size_t _Len, size_t _Align = | |
2500 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
2501 | using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; | |
2502 | ||
d3718027 RS |
2503 | template <size_t _Len, typename... _Types> |
2504 | using aligned_union_t = typename aligned_union<_Len, _Types...>::type; | |
2505 | ||
4457e88c JW |
2506 | /// Alias template for decay |
2507 | template<typename _Tp> | |
2508 | using decay_t = typename decay<_Tp>::type; | |
2509 | ||
2510 | /// Alias template for enable_if | |
2511 | template<bool _Cond, typename _Tp = void> | |
2512 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2513 | ||
2514 | /// Alias template for conditional | |
2515 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
2516 | using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type; | |
2517 | ||
2518 | /// Alias template for common_type | |
2519 | template<typename... _Tp> | |
2520 | using common_type_t = typename common_type<_Tp...>::type; | |
2521 | ||
2522 | /// Alias template for underlying_type | |
2523 | template<typename _Tp> | |
2524 | using underlying_type_t = typename underlying_type<_Tp>::type; | |
2525 | ||
2526 | /// Alias template for result_of | |
2527 | template<typename _Tp> | |
2528 | using result_of_t = typename result_of<_Tp>::type; | |
2529 | #endif | |
2530 | ||
847e9cf8 JW |
2531 | template<typename...> using __void_t = void; |
2532 | ||
bd1eb5e0 JW |
2533 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
2534 | #define __cpp_lib_void_t 201411 | |
2535 | /// A metafunction that always yields void, used for detecting valid types. | |
2536 | template<typename...> using void_t = void; | |
2537 | #endif | |
2538 | ||
6af6bef4 JW |
2539 | /// Implementation of the detection idiom (negative case). |
2540 | template<typename _Default, typename _AlwaysVoid, | |
2541 | template<typename...> class _Op, typename... _Args> | |
2542 | struct __detector | |
2543 | { | |
2544 | using value_t = false_type; | |
2545 | using type = _Default; | |
2546 | }; | |
2547 | ||
2548 | /// Implementation of the detection idiom (positive case). | |
2549 | template<typename _Default, template<typename...> class _Op, | |
2550 | typename... _Args> | |
2551 | struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...> | |
2552 | { | |
2553 | using value_t = true_type; | |
2554 | using type = _Op<_Args...>; | |
2555 | }; | |
2556 | ||
2557 | // Detect whether _Op<_Args...> is a valid type, use _Default if not. | |
2558 | template<typename _Default, template<typename...> class _Op, | |
2559 | typename... _Args> | |
2560 | using __detected_or = __detector<_Default, void, _Op, _Args...>; | |
2561 | ||
2562 | // _Op<_Args...> if that is a valid type, otherwise _Default. | |
2563 | template<typename _Default, template<typename...> class _Op, | |
2564 | typename... _Args> | |
2565 | using __detected_or_t | |
2566 | = typename __detected_or<_Default, _Op, _Args...>::type; | |
2567 | ||
2568 | // _Op<_Args...> if that is a valid type, otherwise _Default<_Args...>. | |
2569 | template<template<typename...> class _Default, | |
2570 | template<typename...> class _Op, typename... _Args> | |
2571 | using __detected_or_t_ = | |
2572 | __detected_or_t<_Default<_Args...>, _Op, _Args...>; | |
2573 | ||
c0ffa2ba | 2574 | /// @} group metaprogramming |
847e9cf8 | 2575 | |
033b71ce PC |
2576 | /** |
2577 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
2578 | * member type _NTYPE. | |
2579 | */ | |
82b12c4b | 2580 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ |
847e9cf8 | 2581 | template<typename _Tp, typename = __void_t<>> \ |
82b12c4b | 2582 | struct __has_##_NTYPE \ |
847e9cf8 JW |
2583 | : false_type \ |
2584 | { }; \ | |
2585 | template<typename _Tp> \ | |
2586 | struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \ | |
2587 | : true_type \ | |
033b71ce PC |
2588 | { }; |
2589 | ||
ddb63209 VV |
2590 | |
2591 | namespace __is_swappable_impl { | |
2592 | template <typename _Tp, typename=void> | |
2593 | struct __is_swappable : public false_type | |
2594 | { }; | |
2595 | } | |
2596 | ||
2597 | template<typename _Tp> | |
2598 | inline | |
2599 | typename enable_if<__and_<is_move_constructible<_Tp>, | |
2600 | is_move_assignable<_Tp>>::value>::type | |
2601 | swap(_Tp&, _Tp&) | |
2602 | noexcept(__and_<is_nothrow_move_constructible<_Tp>, | |
2603 | is_nothrow_move_assignable<_Tp>>::value); | |
2604 | ||
2605 | template<typename _Tp, size_t _Nm> | |
2606 | inline | |
2607 | typename enable_if<__is_swappable_impl::__is_swappable<_Tp>::value>::type | |
2608 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) | |
2609 | noexcept(noexcept(swap(*__a, *__b))); | |
2610 | ||
2611 | namespace __is_swappable_impl { | |
2612 | using std::swap; | |
2613 | ||
2614 | template <typename _Tp> | |
2615 | struct __is_swappable<_Tp, __void_t<decltype(swap(declval<_Tp&>(), | |
2616 | declval<_Tp&>()))>> | |
2617 | : public true_type | |
2618 | { }; | |
2619 | } | |
2620 | ||
2621 | template <bool, typename _Tp> | |
2622 | struct __is_nothrow_swappable_impl | |
2623 | : public __bool_constant<noexcept(swap(declval<_Tp&>(), declval<_Tp&>()))> | |
2624 | { }; | |
2625 | ||
2626 | template <typename _Tp> | |
2627 | struct __is_nothrow_swappable_impl<false, _Tp> : public false_type | |
2628 | { }; | |
2629 | ||
2630 | template <typename _Tp> | |
2631 | struct __is_nothrow_swappable | |
2632 | : public __is_nothrow_swappable_impl< | |
2633 | __is_swappable_impl::__is_swappable<_Tp>::value, _Tp> | |
2634 | { }; | |
2635 | ||
12ffa228 | 2636 | _GLIBCXX_END_NAMESPACE_VERSION |
c0ffa2ba | 2637 | } // namespace std |
7b50cdef | 2638 | |
734f5023 | 2639 | #endif // C++11 |
57317d2a | 2640 | |
7274deff | 2641 | #endif // _GLIBCXX_TYPE_TRAITS |