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5b9daa7e | 1 | // C++0x type_traits -*- C++ -*- |
af13a7a6 | 2 | |
123c516a | 3 | // Copyright (C) 2007, 2008, 2009, 2010, 2011 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 | ||
57317d2a | 34 | #ifndef __GXX_EXPERIMENTAL_CXX0X__ |
ab65a4c7 | 35 | # include <bits/c++0x_warning.h> |
57317d2a | 36 | #else |
af13a7a6 | 37 | |
8fc81078 | 38 | #include <bits/c++config.h> |
e133ace8 | 39 | |
12ffa228 BK |
40 | namespace std _GLIBCXX_VISIBILITY(default) |
41 | { | |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
e133ace8 | 43 | |
8e32aa11 BK |
44 | /** |
45 | * @addtogroup metaprogramming | |
5b9daa7e BK |
46 | * @{ |
47 | */ | |
53dc5044 PC |
48 | struct __sfinae_types |
49 | { | |
50 | typedef char __one; | |
51 | typedef struct { char __arr[2]; } __two; | |
52 | }; | |
53 | ||
123c516a | 54 | // Meta programming helper types. |
53dc5044 | 55 | |
123c516a PC |
56 | template<bool, typename, typename> |
57 | struct conditional; | |
53dc5044 | 58 | |
123c516a PC |
59 | template<typename _Tp, _Tp> |
60 | struct integral_constant; | |
61 | ||
62 | template<typename, typename, typename...> | |
63 | struct __or_; | |
64 | ||
65 | template<typename _B1, typename _B2> | |
66 | struct __or_<_B1, _B2> | |
67 | : public conditional<_B1::value, _B1, _B2>::type | |
68 | { }; | |
69 | ||
70 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
71 | struct __or_<_B1, _B2, _B3, _Bn...> | |
72 | : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type | |
73 | { }; | |
53dc5044 | 74 | |
123c516a PC |
75 | template<typename, typename, typename...> |
76 | struct __and_; | |
53dc5044 | 77 | |
123c516a PC |
78 | template<typename _B1, typename _B2> |
79 | struct __and_<_B1, _B2> | |
80 | : public conditional<_B1::value, _B2, _B1>::type | |
81 | { }; | |
82 | ||
83 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
84 | struct __and_<_B1, _B2, _B3, _Bn...> | |
85 | : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type | |
86 | { }; | |
87 | ||
88 | template<typename _Pp> | |
89 | struct __not_ | |
90 | : public integral_constant<bool, !_Pp::value> | |
91 | { }; | |
92 | ||
93 | // helper class. | |
53dc5044 PC |
94 | |
95 | /// integral_constant | |
96 | template<typename _Tp, _Tp __v> | |
97 | struct integral_constant | |
98 | { | |
99 | static constexpr _Tp value = __v; | |
100 | typedef _Tp value_type; | |
101 | typedef integral_constant<_Tp, __v> type; | |
102 | constexpr operator value_type() { return value; } | |
103 | }; | |
104 | ||
105 | /// typedef for true_type | |
106 | typedef integral_constant<bool, true> true_type; | |
107 | ||
108 | /// typedef for false_type | |
109 | typedef integral_constant<bool, false> false_type; | |
110 | ||
111 | template<typename _Tp, _Tp __v> | |
112 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
113 | ||
123c516a PC |
114 | // primary type categories. |
115 | ||
53dc5044 PC |
116 | template<typename> |
117 | struct remove_cv; | |
118 | ||
119 | template<typename> | |
120 | struct __is_void_helper | |
121 | : public false_type { }; | |
53dc5044 | 122 | |
123c516a PC |
123 | template<> |
124 | struct __is_void_helper<void> | |
125 | : public true_type { }; | |
53dc5044 PC |
126 | |
127 | /// is_void | |
128 | template<typename _Tp> | |
129 | struct is_void | |
130 | : public integral_constant<bool, (__is_void_helper<typename | |
131 | remove_cv<_Tp>::type>::value)> | |
132 | { }; | |
133 | ||
134 | template<typename> | |
135 | struct __is_integral_helper | |
136 | : public false_type { }; | |
123c516a PC |
137 | |
138 | template<> | |
139 | struct __is_integral_helper<bool> | |
140 | : public true_type { }; | |
141 | ||
142 | template<> | |
143 | struct __is_integral_helper<char> | |
144 | : public true_type { }; | |
145 | ||
146 | template<> | |
147 | struct __is_integral_helper<signed char> | |
148 | : public true_type { }; | |
149 | ||
150 | template<> | |
151 | struct __is_integral_helper<unsigned char> | |
152 | : public true_type { }; | |
153 | ||
53dc5044 | 154 | #ifdef _GLIBCXX_USE_WCHAR_T |
123c516a PC |
155 | template<> |
156 | struct __is_integral_helper<wchar_t> | |
157 | : public true_type { }; | |
53dc5044 | 158 | #endif |
123c516a PC |
159 | |
160 | template<> | |
161 | struct __is_integral_helper<char16_t> | |
162 | : public true_type { }; | |
163 | ||
164 | template<> | |
165 | struct __is_integral_helper<char32_t> | |
166 | : public true_type { }; | |
167 | ||
168 | template<> | |
169 | struct __is_integral_helper<short> | |
170 | : public true_type { }; | |
171 | ||
172 | template<> | |
173 | struct __is_integral_helper<unsigned short> | |
174 | : public true_type { }; | |
175 | ||
176 | template<> | |
177 | struct __is_integral_helper<int> | |
178 | : public true_type { }; | |
179 | ||
180 | template<> | |
181 | struct __is_integral_helper<unsigned int> | |
182 | : public true_type { }; | |
183 | ||
184 | template<> | |
185 | struct __is_integral_helper<long> | |
186 | : public true_type { }; | |
187 | ||
188 | template<> | |
189 | struct __is_integral_helper<unsigned long> | |
190 | : public true_type { }; | |
191 | ||
192 | template<> | |
193 | struct __is_integral_helper<long long> | |
194 | : public true_type { }; | |
195 | ||
196 | template<> | |
197 | struct __is_integral_helper<unsigned long long> | |
198 | : public true_type { }; | |
53dc5044 PC |
199 | |
200 | /// is_integral | |
201 | template<typename _Tp> | |
202 | struct is_integral | |
203 | : public integral_constant<bool, (__is_integral_helper<typename | |
204 | remove_cv<_Tp>::type>::value)> | |
205 | { }; | |
206 | ||
207 | template<typename> | |
208 | struct __is_floating_point_helper | |
209 | : public false_type { }; | |
123c516a PC |
210 | |
211 | template<> | |
212 | struct __is_floating_point_helper<float> | |
213 | : public true_type { }; | |
214 | ||
215 | template<> | |
216 | struct __is_floating_point_helper<double> | |
217 | : public true_type { }; | |
218 | ||
219 | template<> | |
220 | struct __is_floating_point_helper<long double> | |
221 | : public true_type { }; | |
53dc5044 PC |
222 | |
223 | /// is_floating_point | |
224 | template<typename _Tp> | |
225 | struct is_floating_point | |
226 | : public integral_constant<bool, (__is_floating_point_helper<typename | |
227 | remove_cv<_Tp>::type>::value)> | |
228 | { }; | |
229 | ||
230 | /// is_array | |
231 | template<typename> | |
232 | struct is_array | |
233 | : public false_type { }; | |
234 | ||
235 | template<typename _Tp, std::size_t _Size> | |
236 | struct is_array<_Tp[_Size]> | |
237 | : public true_type { }; | |
238 | ||
239 | template<typename _Tp> | |
240 | struct is_array<_Tp[]> | |
241 | : public true_type { }; | |
242 | ||
243 | template<typename> | |
244 | struct __is_pointer_helper | |
245 | : public false_type { }; | |
123c516a PC |
246 | |
247 | template<typename _Tp> | |
248 | struct __is_pointer_helper<_Tp*> | |
249 | : public true_type { }; | |
53dc5044 PC |
250 | |
251 | /// is_pointer | |
252 | template<typename _Tp> | |
253 | struct is_pointer | |
254 | : public integral_constant<bool, (__is_pointer_helper<typename | |
255 | remove_cv<_Tp>::type>::value)> | |
256 | { }; | |
257 | ||
123c516a PC |
258 | /// is_lvalue_reference |
259 | template<typename> | |
260 | struct is_lvalue_reference | |
261 | : public false_type { }; | |
262 | ||
53dc5044 | 263 | template<typename _Tp> |
123c516a PC |
264 | struct is_lvalue_reference<_Tp&> |
265 | : public true_type { }; | |
266 | ||
267 | /// is_rvalue_reference | |
268 | template<typename> | |
269 | struct is_rvalue_reference | |
270 | : public false_type { }; | |
53dc5044 | 271 | |
53dc5044 | 272 | template<typename _Tp> |
123c516a PC |
273 | struct is_rvalue_reference<_Tp&&> |
274 | : public true_type { }; | |
275 | ||
276 | template<typename> | |
53dc5044 PC |
277 | struct is_function; |
278 | ||
279 | template<typename> | |
280 | struct __is_member_object_pointer_helper | |
281 | : public false_type { }; | |
123c516a PC |
282 | |
283 | template<typename _Tp, typename _Cp> | |
284 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
285 | : public integral_constant<bool, !is_function<_Tp>::value> { }; | |
53dc5044 PC |
286 | |
287 | /// is_member_object_pointer | |
288 | template<typename _Tp> | |
289 | struct is_member_object_pointer | |
290 | : public integral_constant<bool, (__is_member_object_pointer_helper< | |
291 | typename remove_cv<_Tp>::type>::value)> | |
292 | { }; | |
293 | ||
294 | template<typename> | |
295 | struct __is_member_function_pointer_helper | |
296 | : public false_type { }; | |
123c516a PC |
297 | |
298 | template<typename _Tp, typename _Cp> | |
299 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
300 | : public integral_constant<bool, is_function<_Tp>::value> { }; | |
53dc5044 PC |
301 | |
302 | /// is_member_function_pointer | |
303 | template<typename _Tp> | |
304 | struct is_member_function_pointer | |
305 | : public integral_constant<bool, (__is_member_function_pointer_helper< | |
306 | typename remove_cv<_Tp>::type>::value)> | |
307 | { }; | |
308 | ||
309 | /// is_enum | |
310 | template<typename _Tp> | |
311 | struct is_enum | |
312 | : public integral_constant<bool, __is_enum(_Tp)> | |
313 | { }; | |
314 | ||
315 | /// is_union | |
316 | template<typename _Tp> | |
317 | struct is_union | |
318 | : public integral_constant<bool, __is_union(_Tp)> | |
319 | { }; | |
320 | ||
321 | /// is_class | |
322 | template<typename _Tp> | |
323 | struct is_class | |
324 | : public integral_constant<bool, __is_class(_Tp)> | |
325 | { }; | |
326 | ||
327 | /// is_function | |
328 | template<typename> | |
329 | struct is_function | |
330 | : public false_type { }; | |
123c516a | 331 | |
53dc5044 PC |
332 | template<typename _Res, typename... _ArgTypes> |
333 | struct is_function<_Res(_ArgTypes...)> | |
334 | : public true_type { }; | |
123c516a | 335 | |
53dc5044 PC |
336 | template<typename _Res, typename... _ArgTypes> |
337 | struct is_function<_Res(_ArgTypes......)> | |
338 | : public true_type { }; | |
123c516a | 339 | |
53dc5044 PC |
340 | template<typename _Res, typename... _ArgTypes> |
341 | struct is_function<_Res(_ArgTypes...) const> | |
342 | : public true_type { }; | |
123c516a | 343 | |
53dc5044 PC |
344 | template<typename _Res, typename... _ArgTypes> |
345 | struct is_function<_Res(_ArgTypes......) const> | |
346 | : public true_type { }; | |
123c516a | 347 | |
53dc5044 PC |
348 | template<typename _Res, typename... _ArgTypes> |
349 | struct is_function<_Res(_ArgTypes...) volatile> | |
350 | : public true_type { }; | |
123c516a | 351 | |
53dc5044 PC |
352 | template<typename _Res, typename... _ArgTypes> |
353 | struct is_function<_Res(_ArgTypes......) volatile> | |
354 | : public true_type { }; | |
123c516a | 355 | |
53dc5044 PC |
356 | template<typename _Res, typename... _ArgTypes> |
357 | struct is_function<_Res(_ArgTypes...) const volatile> | |
358 | : public true_type { }; | |
123c516a | 359 | |
53dc5044 PC |
360 | template<typename _Res, typename... _ArgTypes> |
361 | struct is_function<_Res(_ArgTypes......) const volatile> | |
362 | : public true_type { }; | |
363 | ||
1e673415 PC |
364 | template<typename> |
365 | struct __is_nullptr_t_helper | |
366 | : public false_type { }; | |
123c516a PC |
367 | |
368 | template<> | |
369 | struct __is_nullptr_t_helper<std::nullptr_t> | |
370 | : public true_type { }; | |
1e673415 PC |
371 | |
372 | // __is_nullptr_t (extension). | |
373 | template<typename _Tp> | |
374 | struct __is_nullptr_t | |
375 | : public integral_constant<bool, (__is_nullptr_t_helper<typename | |
376 | remove_cv<_Tp>::type>::value)> | |
377 | { }; | |
378 | ||
123c516a PC |
379 | // composite type categories. |
380 | ||
381 | /// is_reference | |
382 | template<typename _Tp> | |
383 | struct is_reference | |
384 | : public __or_<is_lvalue_reference<_Tp>, | |
385 | is_rvalue_reference<_Tp>>::type | |
386 | { }; | |
387 | ||
53dc5044 PC |
388 | /// is_arithmetic |
389 | template<typename _Tp> | |
390 | struct is_arithmetic | |
123c516a | 391 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
392 | { }; |
393 | ||
394 | /// is_fundamental | |
395 | template<typename _Tp> | |
396 | struct is_fundamental | |
123c516a | 397 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>>::type |
53dc5044 PC |
398 | { }; |
399 | ||
400 | /// is_object | |
401 | template<typename _Tp> | |
402 | struct is_object | |
123c516a PC |
403 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
404 | is_void<_Tp>>>::type | |
53dc5044 PC |
405 | { }; |
406 | ||
123c516a | 407 | template<typename> |
53dc5044 PC |
408 | struct is_member_pointer; |
409 | ||
410 | /// is_scalar | |
411 | template<typename _Tp> | |
412 | struct is_scalar | |
123c516a PC |
413 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
414 | is_member_pointer<_Tp>, __is_nullptr_t<_Tp>>::type | |
53dc5044 PC |
415 | { }; |
416 | ||
417 | /// is_compound | |
418 | template<typename _Tp> | |
419 | struct is_compound | |
420 | : public integral_constant<bool, !is_fundamental<_Tp>::value> { }; | |
421 | ||
422 | /// is_member_pointer | |
423 | template<typename _Tp> | |
424 | struct __is_member_pointer_helper | |
425 | : public false_type { }; | |
123c516a PC |
426 | |
427 | template<typename _Tp, typename _Cp> | |
428 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
429 | : public true_type { }; | |
53dc5044 PC |
430 | |
431 | template<typename _Tp> | |
123c516a | 432 | struct is_member_pointer |
53dc5044 PC |
433 | : public integral_constant<bool, (__is_member_pointer_helper< |
434 | typename remove_cv<_Tp>::type>::value)> | |
435 | { }; | |
436 | ||
437 | // type properties. | |
123c516a | 438 | |
53dc5044 PC |
439 | /// is_const |
440 | template<typename> | |
441 | struct is_const | |
442 | : public false_type { }; | |
443 | ||
444 | template<typename _Tp> | |
445 | struct is_const<_Tp const> | |
446 | : public true_type { }; | |
447 | ||
448 | /// is_volatile | |
449 | template<typename> | |
450 | struct is_volatile | |
451 | : public false_type { }; | |
452 | ||
453 | template<typename _Tp> | |
454 | struct is_volatile<_Tp volatile> | |
455 | : public true_type { }; | |
456 | ||
123c516a PC |
457 | /// is_trivial |
458 | template<typename _Tp> | |
459 | struct is_trivial | |
460 | : public integral_constant<bool, __is_trivial(_Tp)> | |
461 | { }; | |
462 | ||
463 | /// is_trivially_copyable (still unimplemented) | |
464 | ||
465 | /// is_standard_layout | |
466 | template<typename _Tp> | |
467 | struct is_standard_layout | |
468 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
469 | { }; | |
470 | ||
471 | /// is_pod | |
472 | // Could use is_standard_layout && is_trivial instead of the builtin. | |
473 | template<typename _Tp> | |
474 | struct is_pod | |
475 | : public integral_constant<bool, __is_pod(_Tp)> | |
476 | { }; | |
477 | ||
478 | /// is_literal_type | |
479 | template<typename _Tp> | |
480 | struct is_literal_type | |
481 | : public integral_constant<bool, __is_literal_type(_Tp)> | |
482 | { }; | |
483 | ||
53dc5044 PC |
484 | /// is_empty |
485 | template<typename _Tp> | |
486 | struct is_empty | |
487 | : public integral_constant<bool, __is_empty(_Tp)> | |
488 | { }; | |
489 | ||
490 | /// is_polymorphic | |
491 | template<typename _Tp> | |
492 | struct is_polymorphic | |
493 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
494 | { }; | |
495 | ||
496 | /// is_abstract | |
497 | template<typename _Tp> | |
498 | struct is_abstract | |
499 | : public integral_constant<bool, __is_abstract(_Tp)> | |
500 | { }; | |
501 | ||
123c516a PC |
502 | template<typename _Tp, |
503 | bool = is_integral<_Tp>::value, | |
504 | bool = is_floating_point<_Tp>::value> | |
505 | struct __is_signed_helper | |
506 | : public false_type { }; | |
507 | ||
53dc5044 | 508 | template<typename _Tp> |
123c516a PC |
509 | struct __is_signed_helper<_Tp, false, true> |
510 | : public true_type { }; | |
511 | ||
512 | template<typename _Tp> | |
513 | struct __is_signed_helper<_Tp, true, false> | |
514 | : public integral_constant<bool, static_cast<bool>(_Tp(-1) < _Tp(0))> | |
53dc5044 PC |
515 | { }; |
516 | ||
123c516a | 517 | /// is_signed |
53dc5044 | 518 | template<typename _Tp> |
123c516a PC |
519 | struct is_signed |
520 | : public integral_constant<bool, __is_signed_helper<_Tp>::value> | |
521 | { }; | |
522 | ||
523 | /// is_unsigned | |
524 | template<typename _Tp> | |
525 | struct is_unsigned | |
526 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type | |
527 | { }; | |
528 | ||
529 | ||
530 | // destructible and constructible type properties | |
531 | ||
53dc5044 | 532 | template<typename> |
123c516a | 533 | struct add_rvalue_reference; |
53dc5044 PC |
534 | |
535 | template<typename _Tp> | |
123c516a | 536 | typename add_rvalue_reference<_Tp>::type declval() noexcept; |
53dc5044 | 537 | |
123c516a PC |
538 | template<typename, unsigned = 0> |
539 | struct extent; | |
540 | ||
541 | template<typename> | |
542 | struct remove_all_extents; | |
543 | ||
544 | template<typename _Tp> | |
545 | struct __is_array_known_bounds | |
546 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
547 | { }; |
548 | ||
123c516a PC |
549 | template<typename _Tp> |
550 | struct __is_array_unknown_bounds | |
551 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>::type | |
53dc5044 | 552 | { }; |
2c7a09d7 PC |
553 | |
554 | // In N3290 is_destructible does not say anything about function | |
555 | // types and abstract types, see LWG 2049. This implementation | |
556 | // describes function types as trivially nothrow destructible and | |
557 | // abstract types as destructible, iff the explicit destructor | |
558 | // call expression is wellformed. | |
123c516a PC |
559 | struct __do_is_destructible_impl_1 |
560 | { | |
561 | template<typename _Up> | |
562 | struct __w { _Up __u; }; | |
53dc5044 | 563 | |
123c516a PC |
564 | template<typename _Tp, typename |
565 | = decltype(declval<__w<_Tp>&>().~__w<_Tp>())> | |
566 | static true_type __test(int); | |
567 | ||
568 | template<typename> | |
569 | static false_type __test(...); | |
570 | }; | |
53dc5044 PC |
571 | |
572 | template<typename _Tp> | |
123c516a PC |
573 | struct __is_destructible_impl_1 |
574 | : public __do_is_destructible_impl_1 | |
575 | { | |
576 | typedef decltype(__test<_Tp>(0)) type; | |
577 | }; | |
53dc5044 | 578 | |
2c7a09d7 | 579 | // Special implementation for abstract types |
123c516a PC |
580 | struct __do_is_destructible_impl_2 |
581 | { | |
582 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> | |
583 | static true_type __test(int); | |
584 | ||
585 | template<typename> | |
586 | static false_type __test(...); | |
587 | }; | |
53dc5044 | 588 | |
53dc5044 | 589 | template<typename _Tp> |
123c516a PC |
590 | struct __is_destructible_impl_2 |
591 | : public __do_is_destructible_impl_2 | |
592 | { | |
593 | typedef decltype(__test<_Tp>(0)) type; | |
594 | }; | |
595 | ||
596 | template<typename _Tp, | |
597 | bool = __or_<is_void<_Tp>, | |
598 | __is_array_unknown_bounds<_Tp>>::value, | |
599 | bool = __or_<is_reference<_Tp>, is_function<_Tp>>::value> | |
600 | struct __is_destructible_safe; | |
53dc5044 PC |
601 | |
602 | template<typename _Tp> | |
123c516a PC |
603 | struct __is_destructible_safe<_Tp, false, false> |
604 | : public conditional<is_abstract<_Tp>::value, | |
605 | __is_destructible_impl_2<_Tp>, | |
606 | __is_destructible_impl_1<_Tp>>::type::type | |
607 | { }; | |
608 | ||
53dc5044 | 609 | template<typename _Tp> |
123c516a PC |
610 | struct __is_destructible_safe<_Tp, true, false> |
611 | : public false_type { }; | |
53dc5044 PC |
612 | |
613 | template<typename _Tp> | |
123c516a PC |
614 | struct __is_destructible_safe<_Tp, false, true> |
615 | : public true_type { }; | |
616 | ||
617 | /// is_destructible | |
53dc5044 | 618 | template<typename _Tp> |
123c516a PC |
619 | struct is_destructible |
620 | : public integral_constant<bool, (__is_destructible_safe<_Tp>::value)> | |
621 | { }; | |
622 | ||
623 | struct __do_is_default_constructible_impl | |
624 | { | |
625 | template<typename _Tp, typename = decltype(_Tp())> | |
626 | static true_type __test(int); | |
627 | ||
628 | template<typename> | |
629 | static false_type __test(...); | |
630 | }; | |
631 | ||
632 | template<typename _Tp> | |
633 | struct __is_default_constructible_impl | |
634 | : public __do_is_default_constructible_impl | |
53dc5044 | 635 | { |
123c516a | 636 | typedef decltype(__test<_Tp>(0)) type; |
53dc5044 | 637 | }; |
53dc5044 PC |
638 | |
639 | template<typename _Tp> | |
123c516a | 640 | struct __is_default_constructible_atom |
2c7a09d7 PC |
641 | : public __and_<__not_<is_void<_Tp>>, |
642 | __is_default_constructible_impl<_Tp>>::type | |
123c516a | 643 | { }; |
53dc5044 | 644 | |
123c516a PC |
645 | template<typename _Tp, bool = is_array<_Tp>::value> |
646 | struct __is_default_constructible_safe; | |
53dc5044 | 647 | |
2c7a09d7 PC |
648 | // The following technique is a workaround for a current core language |
649 | // restriction, which does not allow for array types to occur in | |
650 | // functional casts of the form T(). Complete arrays can be default- | |
651 | // constructed, if the element type is default-constructible, but | |
652 | // arrays with unknown bounds are not. | |
53dc5044 | 653 | template<typename _Tp> |
123c516a PC |
654 | struct __is_default_constructible_safe<_Tp, true> |
655 | : public __and_<__is_array_known_bounds<_Tp>, | |
656 | __is_default_constructible_atom<typename | |
2c7a09d7 | 657 | remove_all_extents<_Tp>::type>>::type |
53dc5044 PC |
658 | { }; |
659 | ||
53dc5044 | 660 | template<typename _Tp> |
123c516a PC |
661 | struct __is_default_constructible_safe<_Tp, false> |
662 | : public __is_default_constructible_atom<_Tp>::type | |
663 | { }; | |
4a27a739 | 664 | |
123c516a | 665 | /// is_default_constructible |
4a27a739 | 666 | template<typename _Tp> |
123c516a PC |
667 | struct is_default_constructible |
668 | : public integral_constant<bool, (__is_default_constructible_safe< | |
669 | _Tp>::value)> | |
670 | { }; | |
4a27a739 | 671 | |
2c7a09d7 PC |
672 | |
673 | // Implementation of is_constructible. | |
674 | ||
675 | // The hardest part of this trait is the binary direct-initialization | |
676 | // case, because we hit into a functional cast of the form T(arg). | |
677 | // This implementation uses different strategies depending on the | |
678 | // target type to reduce the test overhead as much as possible: | |
679 | // | |
680 | // a) For a reference target type, we use a static_cast expression | |
681 | // modulo its extra cases. | |
682 | // | |
683 | // b) For a non-reference target type we use a ::new expression. | |
123c516a PC |
684 | struct __do_is_static_castable_impl |
685 | { | |
686 | template<typename _From, typename _To, typename | |
687 | = decltype(static_cast<_To>(declval<_From>()))> | |
688 | static true_type __test(int); | |
4a27a739 | 689 | |
123c516a PC |
690 | template<typename, typename> |
691 | static false_type __test(...); | |
692 | }; | |
4a27a739 | 693 | |
123c516a PC |
694 | template<typename _From, typename _To> |
695 | struct __is_static_castable_impl | |
696 | : public __do_is_static_castable_impl | |
697 | { | |
698 | typedef decltype(__test<_From, _To>(0)) type; | |
699 | }; | |
939759fc | 700 | |
123c516a PC |
701 | template<typename _From, typename _To> |
702 | struct __is_static_castable_safe | |
2c7a09d7 | 703 | : public __is_static_castable_impl<_From, _To>::type |
4a27a739 PC |
704 | { }; |
705 | ||
123c516a PC |
706 | // __is_static_castable |
707 | template<typename _From, typename _To> | |
708 | struct __is_static_castable | |
709 | : public integral_constant<bool, (__is_static_castable_safe< | |
710 | _From, _To>::value)> | |
711 | { }; | |
939759fc | 712 | |
2c7a09d7 PC |
713 | // Implementation for non-reference types. To meet the proper |
714 | // variable definition semantics, we also need to test for | |
715 | // is_destructible in this case. | |
123c516a PC |
716 | struct __do_is_direct_constructible_impl |
717 | { | |
718 | template<typename _Tp, typename _Arg, typename | |
719 | = decltype(::new _Tp(declval<_Arg>()))> | |
720 | static true_type __test(int); | |
4a27a739 | 721 | |
123c516a PC |
722 | template<typename, typename> |
723 | static false_type __test(...); | |
724 | }; | |
4a27a739 | 725 | |
123c516a PC |
726 | template<typename _Tp, typename _Arg> |
727 | struct __is_direct_constructible_impl | |
728 | : public __do_is_direct_constructible_impl | |
729 | { | |
730 | typedef decltype(__test<_Tp, _Arg>(0)) type; | |
731 | }; | |
4a27a739 | 732 | |
123c516a PC |
733 | template<typename _Tp, typename _Arg> |
734 | struct __is_direct_constructible_new_safe | |
735 | : public __and_<is_destructible<_Tp>, | |
2c7a09d7 | 736 | __is_direct_constructible_impl<_Tp, _Arg>>::type |
123c516a | 737 | { }; |
4a27a739 | 738 | |
123c516a PC |
739 | template<typename, typename> |
740 | struct is_same; | |
4a27a739 | 741 | |
123c516a PC |
742 | template<typename, typename> |
743 | struct is_base_of; | |
4a27a739 | 744 | |
123c516a PC |
745 | template<typename> |
746 | struct remove_reference; | |
4a27a739 | 747 | |
123c516a PC |
748 | template<typename _From, typename _To, bool |
749 | = is_reference<_From>::value> | |
750 | struct __is_base_to_derived_ref; | |
4a27a739 | 751 | |
123c516a PC |
752 | template<typename _From, typename _To> |
753 | struct __is_base_to_derived_ref<_From, _To, true> | |
754 | { | |
755 | typedef typename remove_cv<typename remove_reference<_From | |
756 | >::type>::type __src_t; | |
757 | typedef typename remove_cv<typename remove_reference<_To | |
758 | >::type>::type __dst_t; | |
2c7a09d7 PC |
759 | typedef __and_<__not_<is_same<__src_t, __dst_t>>, |
760 | is_base_of<__src_t, __dst_t>> type; | |
123c516a PC |
761 | static constexpr bool value = type::value; |
762 | }; | |
4a27a739 | 763 | |
123c516a PC |
764 | template<typename _From, typename _To> |
765 | struct __is_base_to_derived_ref<_From, _To, false> | |
766 | : public false_type | |
4a27a739 PC |
767 | { }; |
768 | ||
123c516a PC |
769 | template<typename _From, typename _To, bool |
770 | = __and_<is_lvalue_reference<_From>, | |
771 | is_rvalue_reference<_To>>::value> | |
772 | struct __is_lvalue_to_rvalue_ref; | |
e133ace8 | 773 | |
123c516a PC |
774 | template<typename _From, typename _To> |
775 | struct __is_lvalue_to_rvalue_ref<_From, _To, true> | |
776 | { | |
777 | typedef typename remove_cv<typename remove_reference< | |
778 | _From>::type>::type __src_t; | |
779 | typedef typename remove_cv<typename remove_reference< | |
780 | _To>::type>::type __dst_t; | |
2c7a09d7 PC |
781 | typedef __or_<is_same<__src_t, __dst_t>, |
782 | is_base_of<__dst_t, __src_t>> type; | |
123c516a PC |
783 | static constexpr bool value = type::value; |
784 | }; | |
e133ace8 | 785 | |
123c516a PC |
786 | template<typename _From, typename _To> |
787 | struct __is_lvalue_to_rvalue_ref<_From, _To, false> | |
788 | : public false_type | |
e133ace8 PC |
789 | { }; |
790 | ||
2c7a09d7 PC |
791 | // Here we handle direct-initialization to a reference type as |
792 | // equivalent to a static_cast modulo overshooting conversions. | |
793 | // These are restricted to the following conversions: | |
794 | // a) A glvalue of a base class to a derived class reference | |
795 | // b) An lvalue to an rvalue-reference of reference-compatible | |
796 | // types | |
123c516a PC |
797 | template<typename _Tp, typename _Arg> |
798 | struct __is_direct_constructible_ref_cast | |
799 | : public __and_<__is_static_castable<_Arg, _Tp>, | |
800 | __not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>, | |
801 | __is_lvalue_to_rvalue_ref<_Arg, _Tp> | |
2c7a09d7 | 802 | >>>::type |
e133ace8 PC |
803 | { }; |
804 | ||
123c516a PC |
805 | template<typename _Tp, typename _Arg> |
806 | struct __is_direct_constructible_new | |
807 | : public conditional<is_reference<_Tp>::value, | |
808 | __is_direct_constructible_ref_cast<_Tp, _Arg>, | |
809 | __is_direct_constructible_new_safe<_Tp, _Arg> | |
810 | >::type | |
b0302c68 PC |
811 | { }; |
812 | ||
123c516a PC |
813 | template<typename _Tp, typename _Arg> |
814 | struct __is_direct_constructible | |
815 | : public integral_constant<bool, (__is_direct_constructible_new< | |
2c7a09d7 | 816 | _Tp, _Arg>::value)> |
e133ace8 PC |
817 | { }; |
818 | ||
2c7a09d7 PC |
819 | // Since default-construction and binary direct-initialization have |
820 | // been handled separately, the implementation of the remaining | |
821 | // n-ary construction cases is rather straightforward. | |
123c516a PC |
822 | struct __do_is_nary_constructible_impl |
823 | { | |
824 | template<typename _Tp, typename... _Args, typename | |
825 | = decltype(_Tp(declval<_Args>()...))> | |
826 | static true_type __test(int); | |
2b08f2c5 | 827 | |
123c516a PC |
828 | template<typename, typename...> |
829 | static false_type __test(...); | |
830 | }; | |
b0302c68 PC |
831 | |
832 | template<typename _Tp, typename... _Args> | |
123c516a PC |
833 | struct __is_nary_constructible_impl |
834 | : public __do_is_nary_constructible_impl | |
b0302c68 | 835 | { |
123c516a | 836 | typedef decltype(__test<_Tp, _Args...>(0)) type; |
b0302c68 PC |
837 | }; |
838 | ||
123c516a PC |
839 | template<typename _Tp, typename... _Args> |
840 | struct __is_nary_constructible | |
2c7a09d7 | 841 | : public __is_nary_constructible_impl<_Tp, _Args...>::type |
b0302c68 | 842 | { |
123c516a PC |
843 | static_assert(sizeof...(_Args) > 1, |
844 | "Only useful for > 1 arguments"); | |
845 | }; | |
b0302c68 | 846 | |
123c516a PC |
847 | template<typename _Tp, typename... _Args> |
848 | struct __is_constructible_impl | |
849 | : public __is_nary_constructible<_Tp, _Args...> | |
850 | { }; | |
b0302c68 | 851 | |
123c516a PC |
852 | template<typename _Tp, typename _Arg> |
853 | struct __is_constructible_impl<_Tp, _Arg> | |
854 | : public __is_direct_constructible<_Tp, _Arg> | |
855 | { }; | |
856 | ||
857 | template<typename _Tp> | |
858 | struct __is_constructible_impl<_Tp> | |
859 | : public is_default_constructible<_Tp> | |
860 | { }; | |
b0302c68 PC |
861 | |
862 | /// is_constructible | |
b0302c68 PC |
863 | template<typename _Tp, typename... _Args> |
864 | struct is_constructible | |
123c516a PC |
865 | : public integral_constant<bool, (__is_constructible_impl<_Tp, |
866 | _Args...>::value)> | |
c32097d8 JM |
867 | { }; |
868 | ||
65cee9bd PC |
869 | template<typename _Tp, bool = is_void<_Tp>::value> |
870 | struct __is_copy_constructible_impl; | |
123c516a | 871 | |
65cee9bd PC |
872 | template<typename _Tp> |
873 | struct __is_copy_constructible_impl<_Tp, true> | |
874 | : public false_type { }; | |
875 | ||
876 | template<typename _Tp> | |
877 | struct __is_copy_constructible_impl<_Tp, false> | |
878 | : public is_constructible<_Tp, const _Tp&> | |
879 | { }; | |
880 | ||
881 | /// is_copy_constructible | |
882 | template<typename _Tp> | |
883 | struct is_copy_constructible | |
884 | : public __is_copy_constructible_impl<_Tp> | |
885 | { }; | |
886 | ||
887 | template<typename _Tp, bool = is_void<_Tp>::value> | |
888 | struct __is_move_constructible_impl; | |
889 | ||
890 | template<typename _Tp> | |
891 | struct __is_move_constructible_impl<_Tp, true> | |
892 | : public false_type { }; | |
893 | ||
894 | template<typename _Tp> | |
895 | struct __is_move_constructible_impl<_Tp, false> | |
896 | : public is_constructible<_Tp, _Tp&&> | |
897 | { }; | |
898 | ||
899 | /// is_move_constructible | |
900 | template<typename _Tp> | |
901 | struct is_move_constructible | |
902 | : public __is_move_constructible_impl<_Tp> | |
903 | { }; | |
904 | ||
905 | template<typename _Tp> | |
906 | struct __is_nt_default_constructible_atom | |
907 | : public integral_constant<bool, noexcept(_Tp())> | |
908 | { }; | |
909 | ||
910 | template<typename _Tp, bool = is_array<_Tp>::value> | |
911 | struct __is_nt_default_constructible_impl; | |
912 | ||
913 | template<typename _Tp> | |
914 | struct __is_nt_default_constructible_impl<_Tp, true> | |
915 | : public __and_<__is_array_known_bounds<_Tp>, | |
916 | __is_nt_default_constructible_atom<typename | |
917 | remove_all_extents<_Tp>::type>>::type | |
918 | { }; | |
919 | ||
920 | template<typename _Tp> | |
921 | struct __is_nt_default_constructible_impl<_Tp, false> | |
922 | : public __is_nt_default_constructible_atom<_Tp> | |
923 | { }; | |
924 | ||
925 | /// is_nothrow_default_constructible | |
926 | template<typename _Tp> | |
927 | struct is_nothrow_default_constructible | |
928 | : public __and_<is_default_constructible<_Tp>, | |
929 | __is_nt_default_constructible_impl<_Tp>>::type | |
930 | { }; | |
e4f32cb0 PC |
931 | |
932 | template<typename _Tp, typename... _Args> | |
65cee9bd PC |
933 | struct __is_nt_constructible_impl |
934 | : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> | |
935 | { }; | |
e4f32cb0 PC |
936 | |
937 | template<typename _Tp, typename _Arg> | |
65cee9bd PC |
938 | struct __is_nt_constructible_impl<_Tp, _Arg> |
939 | : public integral_constant<bool, | |
940 | noexcept(static_cast<_Tp>(declval<_Arg>()))> | |
941 | { }; | |
942 | ||
943 | template<typename _Tp> | |
944 | struct __is_nt_constructible_impl<_Tp> | |
945 | : public is_nothrow_default_constructible<_Tp> | |
946 | { }; | |
e4f32cb0 PC |
947 | |
948 | /// is_nothrow_constructible | |
949 | template<typename _Tp, typename... _Args> | |
950 | struct is_nothrow_constructible | |
65cee9bd PC |
951 | : public __and_<is_constructible<_Tp, _Args...>, |
952 | __is_nt_constructible_impl<_Tp, _Args...>>::type | |
953 | { }; | |
954 | ||
955 | template<typename _Tp, bool = is_void<_Tp>::value> | |
956 | struct __is_nothrow_copy_constructible_impl; | |
957 | ||
958 | template<typename _Tp> | |
959 | struct __is_nothrow_copy_constructible_impl<_Tp, true> | |
960 | : public false_type { }; | |
961 | ||
962 | template<typename _Tp> | |
963 | struct __is_nothrow_copy_constructible_impl<_Tp, false> | |
964 | : public is_nothrow_constructible<_Tp, const _Tp&> | |
965 | { }; | |
966 | ||
967 | /// is_nothrow_copy_constructible | |
968 | template<typename _Tp> | |
969 | struct is_nothrow_copy_constructible | |
970 | : public __is_nothrow_copy_constructible_impl<_Tp> | |
971 | { }; | |
972 | ||
973 | template<typename _Tp, bool = is_void<_Tp>::value> | |
974 | struct __is_nothrow_move_constructible_impl; | |
975 | ||
976 | template<typename _Tp> | |
977 | struct __is_nothrow_move_constructible_impl<_Tp, true> | |
978 | : public false_type { }; | |
979 | ||
980 | template<typename _Tp> | |
981 | struct __is_nothrow_move_constructible_impl<_Tp, false> | |
982 | : public is_nothrow_constructible<_Tp, _Tp&&> | |
983 | { }; | |
984 | ||
985 | /// is_nothrow_move_constructible | |
986 | template<typename _Tp> | |
987 | struct is_nothrow_move_constructible | |
988 | : public __is_nothrow_move_constructible_impl<_Tp> | |
989 | { }; | |
990 | ||
f263981a PC |
991 | template<typename _Tp, typename _Up> |
992 | class __is_assignable_helper | |
993 | : public __sfinae_types | |
994 | { | |
995 | template<typename _Tp1, typename _Up1> | |
996 | static decltype(declval<_Tp1>() = declval<_Up1>(), __one()) | |
997 | __test(int); | |
998 | ||
999 | template<typename, typename> | |
1000 | static __two __test(...); | |
1001 | ||
1002 | public: | |
1003 | static constexpr bool value = sizeof(__test<_Tp, _Up>(0)) == 1; | |
1004 | }; | |
1005 | ||
1006 | /// is_assignable | |
1007 | template<typename _Tp, typename _Up> | |
1008 | struct is_assignable | |
1009 | : public integral_constant<bool, | |
1010 | __is_assignable_helper<_Tp, _Up>::value> | |
1011 | { }; | |
1012 | ||
1013 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1014 | struct __is_copy_assignable_impl; | |
1015 | ||
1016 | template<typename _Tp> | |
1017 | struct __is_copy_assignable_impl<_Tp, true> | |
1018 | : public false_type { }; | |
1019 | ||
1020 | template<typename _Tp> | |
1021 | struct __is_copy_assignable_impl<_Tp, false> | |
1022 | : public is_assignable<_Tp&, const _Tp&&> | |
1023 | { }; | |
1024 | ||
1025 | /// is_copy_assignable | |
1026 | template<typename _Tp> | |
1027 | struct is_copy_assignable | |
1028 | : public __is_copy_assignable_impl<_Tp> | |
1029 | { }; | |
1030 | ||
1031 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1032 | struct __is_move_assignable_impl; | |
1033 | ||
1034 | template<typename _Tp> | |
1035 | struct __is_move_assignable_impl<_Tp, true> | |
1036 | : public false_type { }; | |
1037 | ||
1038 | template<typename _Tp> | |
1039 | struct __is_move_assignable_impl<_Tp, false> | |
1040 | : public is_assignable<_Tp&, _Tp&&> | |
1041 | { }; | |
1042 | ||
1043 | /// is_move_assignable | |
1044 | template<typename _Tp> | |
1045 | struct is_move_assignable | |
1046 | : public __is_move_assignable_impl<_Tp> | |
1047 | { }; | |
1048 | ||
1049 | template<typename _Tp, typename _Up> | |
1050 | struct __is_nt_assignable_impl | |
1051 | : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())> | |
1052 | { }; | |
1053 | ||
1054 | /// is_nothrow_assignable | |
1055 | template<typename _Tp, typename _Up> | |
1056 | struct is_nothrow_assignable | |
1057 | : public __and_<is_assignable<_Tp, _Up>, | |
1058 | __is_nt_assignable_impl<_Tp, _Up>>::type | |
1059 | { }; | |
1060 | ||
1061 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1062 | struct __is_nt_copy_assignable_impl; | |
1063 | ||
1064 | template<typename _Tp> | |
1065 | struct __is_nt_copy_assignable_impl<_Tp, true> | |
1066 | : public false_type { }; | |
1067 | ||
1068 | template<typename _Tp> | |
1069 | struct __is_nt_copy_assignable_impl<_Tp, false> | |
1070 | : public is_nothrow_assignable<_Tp&, const _Tp&&> | |
1071 | { }; | |
1072 | ||
1073 | /// is_nothrow_copy_assignable | |
1074 | template<typename _Tp> | |
1075 | struct is_nothrow_copy_assignable | |
1076 | : public __is_nt_copy_assignable_impl<_Tp> | |
1077 | { }; | |
1078 | ||
1079 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1080 | struct __is_nt_move_assignable_impl; | |
1081 | ||
1082 | template<typename _Tp> | |
1083 | struct __is_nt_move_assignable_impl<_Tp, true> | |
1084 | : public false_type { }; | |
1085 | ||
1086 | template<typename _Tp> | |
1087 | struct __is_nt_move_assignable_impl<_Tp, false> | |
1088 | : public is_nothrow_assignable<_Tp&, _Tp&&> | |
1089 | { }; | |
1090 | ||
1091 | /// is_nothrow_move_assignable | |
65cee9bd | 1092 | template<typename _Tp> |
f263981a PC |
1093 | struct is_nothrow_move_assignable |
1094 | : public __is_nt_move_assignable_impl<_Tp> | |
e4f32cb0 PC |
1095 | { }; |
1096 | ||
939759fc | 1097 | /// has_trivial_default_constructor |
e133ace8 PC |
1098 | template<typename _Tp> |
1099 | struct has_trivial_default_constructor | |
1100 | : public integral_constant<bool, __has_trivial_constructor(_Tp)> | |
1101 | { }; | |
1102 | ||
939759fc | 1103 | /// has_trivial_copy_constructor |
e133ace8 PC |
1104 | template<typename _Tp> |
1105 | struct has_trivial_copy_constructor | |
1106 | : public integral_constant<bool, __has_trivial_copy(_Tp)> | |
1107 | { }; | |
1108 | ||
6f5e9b8d | 1109 | /// has_trivial_copy_assign |
e133ace8 | 1110 | template<typename _Tp> |
6f5e9b8d | 1111 | struct has_trivial_copy_assign |
e133ace8 PC |
1112 | : public integral_constant<bool, __has_trivial_assign(_Tp)> |
1113 | { }; | |
1114 | ||
939759fc | 1115 | /// has_trivial_destructor |
e133ace8 PC |
1116 | template<typename _Tp> |
1117 | struct has_trivial_destructor | |
1118 | : public integral_constant<bool, __has_trivial_destructor(_Tp)> | |
1119 | { }; | |
1120 | ||
123c516a PC |
1121 | /// has_virtual_destructor |
1122 | template<typename _Tp> | |
1123 | struct has_virtual_destructor | |
1124 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
1125 | { }; | |
1126 | ||
1127 | ||
1128 | // type property queries. | |
1129 | ||
1130 | /// alignment_of | |
1131 | template<typename _Tp> | |
1132 | struct alignment_of | |
1133 | : public integral_constant<std::size_t, __alignof__(_Tp)> { }; | |
1134 | ||
1135 | /// rank | |
1136 | template<typename> | |
1137 | struct rank | |
1138 | : public integral_constant<std::size_t, 0> { }; | |
1139 | ||
1140 | template<typename _Tp, std::size_t _Size> | |
1141 | struct rank<_Tp[_Size]> | |
1142 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1143 | ||
1144 | template<typename _Tp> | |
1145 | struct rank<_Tp[]> | |
1146 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1147 | ||
1148 | /// extent | |
1149 | template<typename, unsigned _Uint> | |
1150 | struct extent | |
1151 | : public integral_constant<std::size_t, 0> { }; | |
1152 | ||
1153 | template<typename _Tp, unsigned _Uint, std::size_t _Size> | |
1154 | struct extent<_Tp[_Size], _Uint> | |
1155 | : public integral_constant<std::size_t, | |
1156 | _Uint == 0 ? _Size : extent<_Tp, | |
1157 | _Uint - 1>::value> | |
1158 | { }; | |
1159 | ||
1160 | template<typename _Tp, unsigned _Uint> | |
1161 | struct extent<_Tp[], _Uint> | |
1162 | : public integral_constant<std::size_t, | |
1163 | _Uint == 0 ? 0 : extent<_Tp, | |
1164 | _Uint - 1>::value> | |
1165 | { }; | |
1166 | ||
1167 | ||
1168 | // type relations. | |
1169 | ||
1170 | /// is_same | |
1171 | template<typename, typename> | |
1172 | struct is_same | |
1173 | : public false_type { }; | |
1174 | ||
1175 | template<typename _Tp> | |
1176 | struct is_same<_Tp, _Tp> | |
1177 | : public true_type { }; | |
b0302c68 | 1178 | |
939759fc | 1179 | /// is_base_of |
e133ace8 PC |
1180 | template<typename _Base, typename _Derived> |
1181 | struct is_base_of | |
1182 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1183 | { }; | |
1184 | ||
297f34d7 | 1185 | template<typename _From, typename _To, |
123c516a PC |
1186 | bool = __or_<is_void<_From>, is_function<_To>, |
1187 | is_array<_To>>::value> | |
297f34d7 | 1188 | struct __is_convertible_helper |
f263981a | 1189 | { static constexpr bool value = is_void<_To>::value; }; |
297f34d7 | 1190 | |
e133ace8 | 1191 | template<typename _From, typename _To> |
b0302c68 | 1192 | class __is_convertible_helper<_From, _To, false> |
e133ace8 PC |
1193 | : public __sfinae_types |
1194 | { | |
8e7d962a PC |
1195 | template<typename _To1> |
1196 | static void __test_aux(_To1); | |
1197 | ||
1198 | template<typename _From1, typename _To1> | |
1199 | static decltype(__test_aux<_To1>(std::declval<_From1>()), __one()) | |
1200 | __test(int); | |
1201 | ||
1202 | template<typename, typename> | |
1203 | static __two __test(...); | |
297f34d7 | 1204 | |
e133ace8 | 1205 | public: |
f263981a | 1206 | static constexpr bool value = sizeof(__test<_From, _To>(0)) == 1; |
e133ace8 PC |
1207 | }; |
1208 | ||
b0302c68 | 1209 | /// is_convertible |
e133ace8 PC |
1210 | template<typename _From, typename _To> |
1211 | struct is_convertible | |
1212 | : public integral_constant<bool, | |
f263981a | 1213 | __is_convertible_helper<_From, _To>::value> |
e133ace8 PC |
1214 | { }; |
1215 | ||
b0302c68 | 1216 | /// is_explicitly_convertible |
75995f37 PC |
1217 | template<typename _From, typename _To> |
1218 | struct is_explicitly_convertible | |
1219 | : public is_constructible<_To, _From> | |
1220 | { }; | |
1221 | ||
fd735b6a | 1222 | |
123c516a | 1223 | // const-volatile modifications. |
7b50cdef | 1224 | |
123c516a | 1225 | /// remove_const |
7b50cdef | 1226 | template<typename _Tp> |
123c516a PC |
1227 | struct remove_const |
1228 | { typedef _Tp type; }; | |
7b50cdef | 1229 | |
123c516a PC |
1230 | template<typename _Tp> |
1231 | struct remove_const<_Tp const> | |
1232 | { typedef _Tp type; }; | |
1233 | ||
1234 | /// remove_volatile | |
1235 | template<typename _Tp> | |
1236 | struct remove_volatile | |
1237 | { typedef _Tp type; }; | |
7b50cdef | 1238 | |
123c516a PC |
1239 | template<typename _Tp> |
1240 | struct remove_volatile<_Tp volatile> | |
1241 | { typedef _Tp type; }; | |
1242 | ||
1243 | /// remove_cv | |
1244 | template<typename _Tp> | |
1245 | struct remove_cv | |
1246 | { | |
1247 | typedef typename | |
1248 | remove_const<typename remove_volatile<_Tp>::type>::type type; | |
1249 | }; | |
1250 | ||
1251 | /// add_const | |
1252 | template<typename _Tp> | |
1253 | struct add_const | |
1254 | { typedef _Tp const type; }; | |
1255 | ||
1256 | /// add_volatile | |
1257 | template<typename _Tp> | |
1258 | struct add_volatile | |
1259 | { typedef _Tp volatile type; }; | |
1260 | ||
1261 | /// add_cv | |
1262 | template<typename _Tp> | |
1263 | struct add_cv | |
1264 | { | |
1265 | typedef typename | |
1266 | add_const<typename add_volatile<_Tp>::type>::type type; | |
1267 | }; | |
7b50cdef | 1268 | |
7b50cdef | 1269 | |
123c516a | 1270 | // Reference transformations. |
7b50cdef | 1271 | |
123c516a PC |
1272 | /// remove_reference |
1273 | template<typename _Tp> | |
1274 | struct remove_reference | |
1275 | { typedef _Tp type; }; | |
7b50cdef | 1276 | |
123c516a PC |
1277 | template<typename _Tp> |
1278 | struct remove_reference<_Tp&> | |
1279 | { typedef _Tp type; }; | |
7b50cdef | 1280 | |
123c516a PC |
1281 | template<typename _Tp> |
1282 | struct remove_reference<_Tp&&> | |
1283 | { typedef _Tp type; }; | |
1284 | ||
1285 | template<typename _Tp, | |
1286 | bool = __and_<__not_<is_reference<_Tp>>, | |
1287 | __not_<is_void<_Tp>>>::value, | |
1288 | bool = is_rvalue_reference<_Tp>::value> | |
1289 | struct __add_lvalue_reference_helper | |
1290 | { typedef _Tp type; }; | |
7b50cdef | 1291 | |
5e108459 | 1292 | template<typename _Tp> |
123c516a PC |
1293 | struct __add_lvalue_reference_helper<_Tp, true, false> |
1294 | { typedef _Tp& type; }; | |
5e108459 | 1295 | |
5e108459 | 1296 | template<typename _Tp> |
123c516a PC |
1297 | struct __add_lvalue_reference_helper<_Tp, false, true> |
1298 | { typedef typename remove_reference<_Tp>::type& type; }; | |
5e108459 | 1299 | |
123c516a | 1300 | /// add_lvalue_reference |
5e108459 | 1301 | template<typename _Tp> |
123c516a PC |
1302 | struct add_lvalue_reference |
1303 | : public __add_lvalue_reference_helper<_Tp> | |
1304 | { }; | |
1305 | ||
1306 | template<typename _Tp, | |
1307 | bool = __and_<__not_<is_reference<_Tp>>, | |
1308 | __not_<is_void<_Tp>>>::value> | |
1309 | struct __add_rvalue_reference_helper | |
1310 | { typedef _Tp type; }; | |
5e108459 PC |
1311 | |
1312 | template<typename _Tp> | |
123c516a PC |
1313 | struct __add_rvalue_reference_helper<_Tp, true> |
1314 | { typedef _Tp&& type; }; | |
5e108459 | 1315 | |
123c516a | 1316 | /// add_rvalue_reference |
5e108459 | 1317 | template<typename _Tp> |
123c516a PC |
1318 | struct add_rvalue_reference |
1319 | : public __add_rvalue_reference_helper<_Tp> | |
1320 | { }; | |
5e108459 | 1321 | |
7b50cdef | 1322 | |
123c516a PC |
1323 | // sign modifications. |
1324 | ||
7b50cdef BK |
1325 | // Utility for constructing identically cv-qualified types. |
1326 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1327 | struct __cv_selector; | |
1328 | ||
1329 | template<typename _Unqualified> | |
1330 | struct __cv_selector<_Unqualified, false, false> | |
1331 | { typedef _Unqualified __type; }; | |
1332 | ||
1333 | template<typename _Unqualified> | |
1334 | struct __cv_selector<_Unqualified, false, true> | |
1335 | { typedef volatile _Unqualified __type; }; | |
1336 | ||
1337 | template<typename _Unqualified> | |
1338 | struct __cv_selector<_Unqualified, true, false> | |
1339 | { typedef const _Unqualified __type; }; | |
1340 | ||
1341 | template<typename _Unqualified> | |
1342 | struct __cv_selector<_Unqualified, true, true> | |
1343 | { typedef const volatile _Unqualified __type; }; | |
1344 | ||
1345 | template<typename _Qualified, typename _Unqualified, | |
1346 | bool _IsConst = is_const<_Qualified>::value, | |
1347 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1348 | class __match_cv_qualifiers |
7b50cdef | 1349 | { |
7b50cdef BK |
1350 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1351 | ||
1352 | public: | |
1353 | typedef typename __match::__type __type; | |
1354 | }; | |
1355 | ||
7b50cdef BK |
1356 | // Utility for finding the unsigned versions of signed integral types. |
1357 | template<typename _Tp> | |
e133ace8 PC |
1358 | struct __make_unsigned |
1359 | { typedef _Tp __type; }; | |
7b50cdef BK |
1360 | |
1361 | template<> | |
1362 | struct __make_unsigned<char> | |
1363 | { typedef unsigned char __type; }; | |
1364 | ||
1365 | template<> | |
1366 | struct __make_unsigned<signed char> | |
1367 | { typedef unsigned char __type; }; | |
1368 | ||
7b50cdef BK |
1369 | template<> |
1370 | struct __make_unsigned<short> | |
1371 | { typedef unsigned short __type; }; | |
1372 | ||
1373 | template<> | |
1374 | struct __make_unsigned<int> | |
1375 | { typedef unsigned int __type; }; | |
1376 | ||
1377 | template<> | |
1378 | struct __make_unsigned<long> | |
1379 | { typedef unsigned long __type; }; | |
1380 | ||
1381 | template<> | |
1382 | struct __make_unsigned<long long> | |
1383 | { typedef unsigned long long __type; }; | |
1384 | ||
7b50cdef BK |
1385 | // Select between integral and enum: not possible to be both. |
1386 | template<typename _Tp, | |
1387 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1388 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1389 | class __make_unsigned_selector; |
1390 | ||
7b50cdef | 1391 | template<typename _Tp> |
b0302c68 | 1392 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1393 | { |
7b50cdef BK |
1394 | typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt; |
1395 | typedef typename __unsignedt::__type __unsigned_type; | |
1396 | typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned; | |
1397 | ||
1398 | public: | |
1399 | typedef typename __cv_unsigned::__type __type; | |
1400 | }; | |
1401 | ||
7b50cdef | 1402 | template<typename _Tp> |
b0302c68 | 1403 | class __make_unsigned_selector<_Tp, false, true> |
7b50cdef | 1404 | { |
a0230468 MM |
1405 | // With -fshort-enums, an enum may be as small as a char. |
1406 | typedef unsigned char __smallest; | |
1407 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1408 | static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short); | |
ce2e6349 | 1409 | static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int); |
a0230468 MM |
1410 | typedef conditional<__b2, unsigned int, unsigned long> __cond2; |
1411 | typedef typename __cond2::type __cond2_type; | |
1412 | typedef conditional<__b1, unsigned short, __cond2_type> __cond1; | |
1413 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1414 | |
1415 | public: | |
a0230468 | 1416 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1417 | }; |
1418 | ||
7b50cdef BK |
1419 | // Given an integral/enum type, return the corresponding unsigned |
1420 | // integer type. | |
5b9daa7e BK |
1421 | // Primary template. |
1422 | /// make_unsigned | |
7b50cdef BK |
1423 | template<typename _Tp> |
1424 | struct make_unsigned | |
1425 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; | |
1426 | ||
1427 | // Integral, but don't define. | |
1428 | template<> | |
1429 | struct make_unsigned<bool>; | |
1430 | ||
1431 | ||
1432 | // Utility for finding the signed versions of unsigned integral types. | |
1433 | template<typename _Tp> | |
e133ace8 PC |
1434 | struct __make_signed |
1435 | { typedef _Tp __type; }; | |
7b50cdef BK |
1436 | |
1437 | template<> | |
1438 | struct __make_signed<char> | |
1439 | { typedef signed char __type; }; | |
1440 | ||
1441 | template<> | |
1442 | struct __make_signed<unsigned char> | |
1443 | { typedef signed char __type; }; | |
1444 | ||
7b50cdef BK |
1445 | template<> |
1446 | struct __make_signed<unsigned short> | |
1447 | { typedef signed short __type; }; | |
1448 | ||
1449 | template<> | |
1450 | struct __make_signed<unsigned int> | |
1451 | { typedef signed int __type; }; | |
1452 | ||
1453 | template<> | |
1454 | struct __make_signed<unsigned long> | |
1455 | { typedef signed long __type; }; | |
1456 | ||
1457 | template<> | |
1458 | struct __make_signed<unsigned long long> | |
1459 | { typedef signed long long __type; }; | |
1460 | ||
fb8ffd10 | 1461 | // Select between integral and enum: not possible to be both. |
7b50cdef BK |
1462 | template<typename _Tp, |
1463 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1464 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1465 | class __make_signed_selector; |
1466 | ||
7b50cdef | 1467 | template<typename _Tp> |
b0302c68 | 1468 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1469 | { |
7b50cdef BK |
1470 | typedef __make_signed<typename remove_cv<_Tp>::type> __signedt; |
1471 | typedef typename __signedt::__type __signed_type; | |
1472 | typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed; | |
1473 | ||
1474 | public: | |
1475 | typedef typename __cv_signed::__type __type; | |
1476 | }; | |
1477 | ||
7b50cdef | 1478 | template<typename _Tp> |
b0302c68 | 1479 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1480 | { |
a0230468 MM |
1481 | // With -fshort-enums, an enum may be as small as a char. |
1482 | typedef signed char __smallest; | |
1483 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1484 | static const bool __b1 = sizeof(_Tp) <= sizeof(signed short); | |
ce2e6349 | 1485 | static const bool __b2 = sizeof(_Tp) <= sizeof(signed int); |
a0230468 MM |
1486 | typedef conditional<__b2, signed int, signed long> __cond2; |
1487 | typedef typename __cond2::type __cond2_type; | |
1488 | typedef conditional<__b1, signed short, __cond2_type> __cond1; | |
1489 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1490 | |
1491 | public: | |
a0230468 | 1492 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1493 | }; |
1494 | ||
7b50cdef BK |
1495 | // Given an integral/enum type, return the corresponding signed |
1496 | // integer type. | |
5b9daa7e BK |
1497 | // Primary template. |
1498 | /// make_signed | |
7b50cdef BK |
1499 | template<typename _Tp> |
1500 | struct make_signed | |
1501 | { typedef typename __make_signed_selector<_Tp>::__type type; }; | |
1502 | ||
1503 | // Integral, but don't define. | |
1504 | template<> | |
1505 | struct make_signed<bool>; | |
cfa9a96b | 1506 | |
123c516a PC |
1507 | |
1508 | // array modifications. | |
1509 | ||
1510 | /// remove_extent | |
1511 | template<typename _Tp> | |
1512 | struct remove_extent | |
1513 | { typedef _Tp type; }; | |
1514 | ||
1515 | template<typename _Tp, std::size_t _Size> | |
1516 | struct remove_extent<_Tp[_Size]> | |
1517 | { typedef _Tp type; }; | |
1518 | ||
1519 | template<typename _Tp> | |
1520 | struct remove_extent<_Tp[]> | |
1521 | { typedef _Tp type; }; | |
1522 | ||
1523 | /// remove_all_extents | |
1524 | template<typename _Tp> | |
1525 | struct remove_all_extents | |
1526 | { typedef _Tp type; }; | |
1527 | ||
1528 | template<typename _Tp, std::size_t _Size> | |
1529 | struct remove_all_extents<_Tp[_Size]> | |
1530 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1531 | ||
1532 | template<typename _Tp> | |
1533 | struct remove_all_extents<_Tp[]> | |
1534 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1535 | ||
1536 | ||
1537 | // pointer modifications. | |
1538 | ||
1539 | template<typename _Tp, typename> | |
1540 | struct __remove_pointer_helper | |
1541 | { typedef _Tp type; }; | |
1542 | ||
1543 | template<typename _Tp, typename _Up> | |
1544 | struct __remove_pointer_helper<_Tp, _Up*> | |
1545 | { typedef _Up type; }; | |
1546 | ||
1547 | /// remove_pointer | |
1548 | template<typename _Tp> | |
1549 | struct remove_pointer | |
1550 | : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> | |
1551 | { }; | |
1552 | ||
1553 | /// add_pointer | |
1554 | template<typename _Tp> | |
1555 | struct add_pointer | |
1556 | { typedef typename remove_reference<_Tp>::type* type; }; | |
1557 | ||
1558 | ||
1559 | template<std::size_t _Len> | |
1560 | struct __aligned_storage_msa | |
1561 | { | |
1562 | union __type | |
1563 | { | |
1564 | unsigned char __data[_Len]; | |
1565 | struct __attribute__((__aligned__)) { } __align; | |
1566 | }; | |
1567 | }; | |
1568 | ||
1569 | /** | |
1570 | * @brief Alignment type. | |
1571 | * | |
1572 | * The value of _Align is a default-alignment which shall be the | |
1573 | * most stringent alignment requirement for any C++ object type | |
1574 | * whose size is no greater than _Len (3.9). The member typedef | |
1575 | * type shall be a POD type suitable for use as uninitialized | |
1576 | * storage for any object whose size is at most _Len and whose | |
1577 | * alignment is a divisor of _Align. | |
1578 | */ | |
1579 | template<std::size_t _Len, std::size_t _Align = | |
1580 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
1581 | struct aligned_storage | |
1582 | { | |
1583 | union type | |
1584 | { | |
1585 | unsigned char __data[_Len]; | |
1586 | struct __attribute__((__aligned__((_Align)))) { } __align; | |
1587 | }; | |
1588 | }; | |
1589 | ||
1590 | ||
1591 | // Decay trait for arrays and functions, used for perfect forwarding | |
1592 | // in make_pair, make_tuple, etc. | |
1593 | template<typename _Up, | |
1594 | bool _IsArray = is_array<_Up>::value, | |
1595 | bool _IsFunction = is_function<_Up>::value> | |
1596 | struct __decay_selector; | |
1597 | ||
1598 | // NB: DR 705. | |
1599 | template<typename _Up> | |
1600 | struct __decay_selector<_Up, false, false> | |
1601 | { typedef typename remove_cv<_Up>::type __type; }; | |
1602 | ||
1603 | template<typename _Up> | |
1604 | struct __decay_selector<_Up, true, false> | |
1605 | { typedef typename remove_extent<_Up>::type* __type; }; | |
1606 | ||
1607 | template<typename _Up> | |
1608 | struct __decay_selector<_Up, false, true> | |
1609 | { typedef typename add_pointer<_Up>::type __type; }; | |
1610 | ||
1611 | /// decay | |
1612 | template<typename _Tp> | |
1613 | class decay | |
1614 | { | |
1615 | typedef typename remove_reference<_Tp>::type __remove_type; | |
1616 | ||
1617 | public: | |
1618 | typedef typename __decay_selector<__remove_type>::__type type; | |
1619 | }; | |
1620 | ||
1621 | template<typename _Tp> | |
1622 | class reference_wrapper; | |
1623 | ||
1624 | // Helper which adds a reference to a type when given a reference_wrapper | |
1625 | template<typename _Tp> | |
1626 | struct __strip_reference_wrapper | |
1627 | { | |
1628 | typedef _Tp __type; | |
1629 | }; | |
1630 | ||
1631 | template<typename _Tp> | |
1632 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
1633 | { | |
1634 | typedef _Tp& __type; | |
1635 | }; | |
1636 | ||
1637 | template<typename _Tp> | |
1638 | struct __strip_reference_wrapper<const reference_wrapper<_Tp> > | |
1639 | { | |
1640 | typedef _Tp& __type; | |
1641 | }; | |
1642 | ||
1643 | template<typename _Tp> | |
1644 | struct __decay_and_strip | |
1645 | { | |
1646 | typedef typename __strip_reference_wrapper< | |
1647 | typename decay<_Tp>::type>::__type __type; | |
1648 | }; | |
1649 | ||
1650 | ||
1651 | // Define a nested type if some predicate holds. | |
1652 | // Primary template. | |
1653 | /// enable_if | |
1654 | template<bool, typename _Tp = void> | |
1655 | struct enable_if | |
1656 | { }; | |
1657 | ||
1658 | // Partial specialization for true. | |
1659 | template<typename _Tp> | |
1660 | struct enable_if<true, _Tp> | |
1661 | { typedef _Tp type; }; | |
1662 | ||
1663 | ||
1664 | // A conditional expression, but for types. If true, first, if false, second. | |
1665 | // Primary template. | |
1666 | /// conditional | |
1667 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
1668 | struct conditional | |
1669 | { typedef _Iftrue type; }; | |
1670 | ||
1671 | // Partial specialization for false. | |
1672 | template<typename _Iftrue, typename _Iffalse> | |
1673 | struct conditional<false, _Iftrue, _Iffalse> | |
1674 | { typedef _Iffalse type; }; | |
1675 | ||
1676 | ||
5b9daa7e | 1677 | /// common_type |
cfa9a96b CF |
1678 | template<typename... _Tp> |
1679 | struct common_type; | |
1680 | ||
1681 | template<typename _Tp> | |
1682 | struct common_type<_Tp> | |
7274deff | 1683 | { typedef _Tp type; }; |
cfa9a96b CF |
1684 | |
1685 | template<typename _Tp, typename _Up> | |
7274deff PC |
1686 | struct common_type<_Tp, _Up> |
1687 | { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; }; | |
cfa9a96b CF |
1688 | |
1689 | template<typename _Tp, typename _Up, typename... _Vp> | |
1690 | struct common_type<_Tp, _Up, _Vp...> | |
1691 | { | |
1692 | typedef typename | |
1693 | common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type; | |
1694 | }; | |
7274deff | 1695 | |
a47407f6 PC |
1696 | /// underlying_type |
1697 | template<typename _Tp> | |
1698 | struct underlying_type | |
1699 | { | |
1700 | typedef __underlying_type(_Tp) type; | |
1701 | }; | |
123c516a | 1702 | |
7274deff PC |
1703 | /// declval |
1704 | template<typename _Tp> | |
1705 | struct __declval_protector | |
1706 | { | |
1707 | static const bool __stop = false; | |
1708 | static typename add_rvalue_reference<_Tp>::type __delegate(); | |
1709 | }; | |
1710 | ||
1711 | template<typename _Tp> | |
1712 | inline typename add_rvalue_reference<_Tp>::type | |
e4f32cb0 | 1713 | declval() noexcept |
7274deff PC |
1714 | { |
1715 | static_assert(__declval_protector<_Tp>::__stop, | |
1716 | "declval() must not be used!"); | |
1717 | return __declval_protector<_Tp>::__delegate(); | |
1718 | } | |
1041daba | 1719 | |
be7f7822 JW |
1720 | /// result_of |
1721 | template<typename _Signature> | |
1722 | class result_of; | |
1723 | ||
1724 | template<typename _MemPtr, typename _Arg> | |
1725 | struct _Result_of_memobj; | |
1726 | ||
1727 | template<typename _Res, typename _Class, typename _Arg> | |
1728 | struct _Result_of_memobj<_Res _Class::*, _Arg> | |
1729 | { | |
1730 | private: | |
1731 | typedef _Res _Class::* _Func; | |
1732 | ||
1733 | template<typename _Tp> | |
1734 | static _Tp _S_get(const _Class&); | |
1735 | template<typename _Tp> | |
1736 | static decltype(*std::declval<_Tp>()) _S_get(...); | |
1737 | ||
1738 | public: | |
1739 | typedef | |
1740 | decltype(_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>()) | |
1741 | __type; | |
1742 | }; | |
1743 | ||
1744 | template<typename _MemPtr, typename _Arg, typename... _ArgTypes> | |
1745 | struct _Result_of_memfun; | |
1746 | ||
1747 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
1748 | struct _Result_of_memfun<_Res _Class::*, _Arg, _Args...> | |
1749 | { | |
1750 | private: | |
1751 | typedef _Res _Class::* _Func; | |
1752 | ||
1753 | template<typename _Tp> | |
1754 | static _Tp _S_get(const _Class&); | |
1755 | template<typename _Tp> | |
1756 | static decltype(*std::declval<_Tp>()) _S_get(...); | |
1757 | ||
1758 | public: | |
1759 | typedef | |
1760 | decltype((_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>()) | |
1761 | (std::declval<_Args>()...) ) | |
1762 | __type; | |
1763 | }; | |
1764 | ||
1765 | template<bool, bool, typename _Functor, typename... _ArgTypes> | |
1766 | struct _Result_of_impl; | |
1767 | ||
1768 | template<typename _Functor, typename... _ArgTypes> | |
1769 | struct _Result_of_impl<false, false, _Functor, _ArgTypes...> | |
1770 | { | |
1771 | typedef | |
1772 | decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) ) | |
1773 | __type; | |
1774 | }; | |
1775 | ||
1776 | template<typename _MemPtr, typename _Arg> | |
1777 | struct _Result_of_impl<true, false, _MemPtr, _Arg> | |
1778 | : _Result_of_memobj<typename remove_reference<_MemPtr>::type, _Arg> | |
1779 | { | |
1780 | typedef typename _Result_of_memobj< | |
1781 | typename remove_reference<_MemPtr>::type, _Arg>::__type | |
1782 | __type; | |
1783 | }; | |
1784 | ||
1785 | template<typename _MemPtr, typename _Arg, typename... _ArgTypes> | |
1786 | struct _Result_of_impl<false, true, _MemPtr, _Arg, _ArgTypes...> | |
1787 | : _Result_of_memfun<typename remove_reference<_MemPtr>::type, _Arg, | |
1788 | _ArgTypes...> | |
1789 | { | |
1790 | typedef typename _Result_of_memfun< | |
1791 | typename remove_reference<_MemPtr>::type, _Arg, _ArgTypes...>::__type | |
1792 | __type; | |
1793 | }; | |
1794 | ||
1795 | template<typename _Functor, typename... _ArgTypes> | |
1796 | struct result_of<_Functor(_ArgTypes...)> | |
1797 | : _Result_of_impl<is_member_object_pointer< | |
1798 | typename remove_reference<_Functor>::type >::value, | |
1799 | is_member_function_pointer< | |
1800 | typename remove_reference<_Functor>::type >::value, | |
1801 | _Functor, _ArgTypes...> | |
1802 | { | |
1803 | typedef typename _Result_of_impl< | |
1804 | is_member_object_pointer< | |
1805 | typename remove_reference<_Functor>::type >::value, | |
1806 | is_member_function_pointer< | |
1807 | typename remove_reference<_Functor>::type >::value, | |
1808 | _Functor, _ArgTypes...>::__type | |
1809 | type; | |
1810 | }; | |
1811 | ||
033b71ce PC |
1812 | /** |
1813 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
1814 | * member type _NTYPE. | |
1815 | */ | |
1816 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ | |
1817 | template<typename _Tp> \ | |
1818 | class __has_##_NTYPE##_helper \ | |
1819 | : __sfinae_types \ | |
1820 | { \ | |
1821 | template<typename _Up> \ | |
1822 | struct _Wrap_type \ | |
1823 | { }; \ | |
1824 | \ | |
1825 | template<typename _Up> \ | |
1826 | static __one __test(_Wrap_type<typename _Up::_NTYPE>*); \ | |
1827 | \ | |
1828 | template<typename _Up> \ | |
1829 | static __two __test(...); \ | |
1830 | \ | |
1831 | public: \ | |
f263981a | 1832 | static constexpr bool value = sizeof(__test<_Tp>(0)) == 1; \ |
033b71ce PC |
1833 | }; \ |
1834 | \ | |
1835 | template<typename _Tp> \ | |
1836 | struct __has_##_NTYPE \ | |
1837 | : integral_constant<bool, __has_##_NTYPE##_helper \ | |
1838 | <typename remove_cv<_Tp>::type>::value> \ | |
1839 | { }; | |
1840 | ||
1041daba | 1841 | // @} group metaprogramming |
12ffa228 BK |
1842 | _GLIBCXX_END_NAMESPACE_VERSION |
1843 | } // namespace | |
7b50cdef | 1844 | |
57317d2a PC |
1845 | #endif // __GXX_EXPERIMENTAL_CXX0X__ |
1846 | ||
7274deff | 1847 | #endif // _GLIBCXX_TYPE_TRAITS |