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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 | ||
dd7b175e | 62 | template<typename...> |
123c516a PC |
63 | struct __or_; |
64 | ||
dd7b175e PC |
65 | template<typename _B1> |
66 | struct __or_<_B1> | |
67 | : public _B1 | |
68 | { }; | |
69 | ||
123c516a PC |
70 | template<typename _B1, typename _B2> |
71 | struct __or_<_B1, _B2> | |
72 | : public conditional<_B1::value, _B1, _B2>::type | |
73 | { }; | |
74 | ||
75 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
76 | struct __or_<_B1, _B2, _B3, _Bn...> | |
77 | : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type | |
78 | { }; | |
53dc5044 | 79 | |
dd7b175e | 80 | template<typename...> |
123c516a | 81 | struct __and_; |
53dc5044 | 82 | |
dd7b175e PC |
83 | template<typename _B1> |
84 | struct __and_<_B1> | |
85 | : public _B1 | |
86 | { }; | |
87 | ||
123c516a PC |
88 | template<typename _B1, typename _B2> |
89 | struct __and_<_B1, _B2> | |
90 | : public conditional<_B1::value, _B2, _B1>::type | |
91 | { }; | |
92 | ||
93 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
94 | struct __and_<_B1, _B2, _B3, _Bn...> | |
95 | : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type | |
96 | { }; | |
97 | ||
98 | template<typename _Pp> | |
99 | struct __not_ | |
100 | : public integral_constant<bool, !_Pp::value> | |
101 | { }; | |
102 | ||
103 | // helper class. | |
53dc5044 PC |
104 | |
105 | /// integral_constant | |
106 | template<typename _Tp, _Tp __v> | |
107 | struct integral_constant | |
108 | { | |
109 | static constexpr _Tp value = __v; | |
110 | typedef _Tp value_type; | |
111 | typedef integral_constant<_Tp, __v> type; | |
112 | constexpr operator value_type() { return value; } | |
113 | }; | |
114 | ||
115 | /// typedef for true_type | |
116 | typedef integral_constant<bool, true> true_type; | |
117 | ||
118 | /// typedef for false_type | |
119 | typedef integral_constant<bool, false> false_type; | |
120 | ||
121 | template<typename _Tp, _Tp __v> | |
122 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
123 | ||
123c516a PC |
124 | // primary type categories. |
125 | ||
53dc5044 PC |
126 | template<typename> |
127 | struct remove_cv; | |
128 | ||
129 | template<typename> | |
130 | struct __is_void_helper | |
131 | : public false_type { }; | |
53dc5044 | 132 | |
123c516a PC |
133 | template<> |
134 | struct __is_void_helper<void> | |
135 | : public true_type { }; | |
53dc5044 PC |
136 | |
137 | /// is_void | |
138 | template<typename _Tp> | |
139 | struct is_void | |
140 | : public integral_constant<bool, (__is_void_helper<typename | |
141 | remove_cv<_Tp>::type>::value)> | |
142 | { }; | |
143 | ||
144 | template<typename> | |
145 | struct __is_integral_helper | |
146 | : public false_type { }; | |
123c516a PC |
147 | |
148 | template<> | |
149 | struct __is_integral_helper<bool> | |
150 | : public true_type { }; | |
151 | ||
152 | template<> | |
153 | struct __is_integral_helper<char> | |
154 | : public true_type { }; | |
155 | ||
156 | template<> | |
157 | struct __is_integral_helper<signed char> | |
158 | : public true_type { }; | |
159 | ||
160 | template<> | |
161 | struct __is_integral_helper<unsigned char> | |
162 | : public true_type { }; | |
163 | ||
53dc5044 | 164 | #ifdef _GLIBCXX_USE_WCHAR_T |
123c516a PC |
165 | template<> |
166 | struct __is_integral_helper<wchar_t> | |
167 | : public true_type { }; | |
53dc5044 | 168 | #endif |
123c516a PC |
169 | |
170 | template<> | |
171 | struct __is_integral_helper<char16_t> | |
172 | : public true_type { }; | |
173 | ||
174 | template<> | |
175 | struct __is_integral_helper<char32_t> | |
176 | : public true_type { }; | |
177 | ||
178 | template<> | |
179 | struct __is_integral_helper<short> | |
180 | : public true_type { }; | |
181 | ||
182 | template<> | |
183 | struct __is_integral_helper<unsigned short> | |
184 | : public true_type { }; | |
185 | ||
186 | template<> | |
187 | struct __is_integral_helper<int> | |
188 | : public true_type { }; | |
189 | ||
190 | template<> | |
191 | struct __is_integral_helper<unsigned int> | |
192 | : public true_type { }; | |
193 | ||
194 | template<> | |
195 | struct __is_integral_helper<long> | |
196 | : public true_type { }; | |
197 | ||
198 | template<> | |
199 | struct __is_integral_helper<unsigned long> | |
200 | : public true_type { }; | |
201 | ||
202 | template<> | |
203 | struct __is_integral_helper<long long> | |
204 | : public true_type { }; | |
205 | ||
206 | template<> | |
207 | struct __is_integral_helper<unsigned long long> | |
208 | : public true_type { }; | |
53dc5044 PC |
209 | |
210 | /// is_integral | |
211 | template<typename _Tp> | |
212 | struct is_integral | |
213 | : public integral_constant<bool, (__is_integral_helper<typename | |
214 | remove_cv<_Tp>::type>::value)> | |
215 | { }; | |
216 | ||
217 | template<typename> | |
218 | struct __is_floating_point_helper | |
219 | : public false_type { }; | |
123c516a PC |
220 | |
221 | template<> | |
222 | struct __is_floating_point_helper<float> | |
223 | : public true_type { }; | |
224 | ||
225 | template<> | |
226 | struct __is_floating_point_helper<double> | |
227 | : public true_type { }; | |
228 | ||
229 | template<> | |
230 | struct __is_floating_point_helper<long double> | |
231 | : public true_type { }; | |
53dc5044 PC |
232 | |
233 | /// is_floating_point | |
234 | template<typename _Tp> | |
235 | struct is_floating_point | |
236 | : public integral_constant<bool, (__is_floating_point_helper<typename | |
237 | remove_cv<_Tp>::type>::value)> | |
238 | { }; | |
239 | ||
240 | /// is_array | |
241 | template<typename> | |
242 | struct is_array | |
243 | : public false_type { }; | |
244 | ||
245 | template<typename _Tp, std::size_t _Size> | |
246 | struct is_array<_Tp[_Size]> | |
247 | : public true_type { }; | |
248 | ||
249 | template<typename _Tp> | |
250 | struct is_array<_Tp[]> | |
251 | : public true_type { }; | |
252 | ||
253 | template<typename> | |
254 | struct __is_pointer_helper | |
255 | : public false_type { }; | |
123c516a PC |
256 | |
257 | template<typename _Tp> | |
258 | struct __is_pointer_helper<_Tp*> | |
259 | : public true_type { }; | |
53dc5044 PC |
260 | |
261 | /// is_pointer | |
262 | template<typename _Tp> | |
263 | struct is_pointer | |
264 | : public integral_constant<bool, (__is_pointer_helper<typename | |
265 | remove_cv<_Tp>::type>::value)> | |
266 | { }; | |
267 | ||
123c516a PC |
268 | /// is_lvalue_reference |
269 | template<typename> | |
270 | struct is_lvalue_reference | |
271 | : public false_type { }; | |
272 | ||
53dc5044 | 273 | template<typename _Tp> |
123c516a PC |
274 | struct is_lvalue_reference<_Tp&> |
275 | : public true_type { }; | |
276 | ||
277 | /// is_rvalue_reference | |
278 | template<typename> | |
279 | struct is_rvalue_reference | |
280 | : public false_type { }; | |
53dc5044 | 281 | |
53dc5044 | 282 | template<typename _Tp> |
123c516a PC |
283 | struct is_rvalue_reference<_Tp&&> |
284 | : public true_type { }; | |
285 | ||
286 | template<typename> | |
53dc5044 PC |
287 | struct is_function; |
288 | ||
289 | template<typename> | |
290 | struct __is_member_object_pointer_helper | |
291 | : public false_type { }; | |
123c516a PC |
292 | |
293 | template<typename _Tp, typename _Cp> | |
294 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
295 | : public integral_constant<bool, !is_function<_Tp>::value> { }; | |
53dc5044 PC |
296 | |
297 | /// is_member_object_pointer | |
298 | template<typename _Tp> | |
299 | struct is_member_object_pointer | |
300 | : public integral_constant<bool, (__is_member_object_pointer_helper< | |
301 | typename remove_cv<_Tp>::type>::value)> | |
302 | { }; | |
303 | ||
304 | template<typename> | |
305 | struct __is_member_function_pointer_helper | |
306 | : public false_type { }; | |
123c516a PC |
307 | |
308 | template<typename _Tp, typename _Cp> | |
309 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
310 | : public integral_constant<bool, is_function<_Tp>::value> { }; | |
53dc5044 PC |
311 | |
312 | /// is_member_function_pointer | |
313 | template<typename _Tp> | |
314 | struct is_member_function_pointer | |
315 | : public integral_constant<bool, (__is_member_function_pointer_helper< | |
316 | typename remove_cv<_Tp>::type>::value)> | |
317 | { }; | |
318 | ||
319 | /// is_enum | |
320 | template<typename _Tp> | |
321 | struct is_enum | |
322 | : public integral_constant<bool, __is_enum(_Tp)> | |
323 | { }; | |
324 | ||
325 | /// is_union | |
326 | template<typename _Tp> | |
327 | struct is_union | |
328 | : public integral_constant<bool, __is_union(_Tp)> | |
329 | { }; | |
330 | ||
331 | /// is_class | |
332 | template<typename _Tp> | |
333 | struct is_class | |
334 | : public integral_constant<bool, __is_class(_Tp)> | |
335 | { }; | |
336 | ||
337 | /// is_function | |
338 | template<typename> | |
339 | struct is_function | |
340 | : public false_type { }; | |
123c516a | 341 | |
53dc5044 PC |
342 | template<typename _Res, typename... _ArgTypes> |
343 | struct is_function<_Res(_ArgTypes...)> | |
344 | : public true_type { }; | |
123c516a | 345 | |
53dc5044 PC |
346 | template<typename _Res, typename... _ArgTypes> |
347 | struct is_function<_Res(_ArgTypes......)> | |
348 | : public true_type { }; | |
123c516a | 349 | |
53dc5044 PC |
350 | template<typename _Res, typename... _ArgTypes> |
351 | struct is_function<_Res(_ArgTypes...) const> | |
352 | : public true_type { }; | |
123c516a | 353 | |
53dc5044 PC |
354 | template<typename _Res, typename... _ArgTypes> |
355 | struct is_function<_Res(_ArgTypes......) const> | |
356 | : public true_type { }; | |
123c516a | 357 | |
53dc5044 PC |
358 | template<typename _Res, typename... _ArgTypes> |
359 | struct is_function<_Res(_ArgTypes...) volatile> | |
360 | : public true_type { }; | |
123c516a | 361 | |
53dc5044 PC |
362 | template<typename _Res, typename... _ArgTypes> |
363 | struct is_function<_Res(_ArgTypes......) volatile> | |
364 | : public true_type { }; | |
123c516a | 365 | |
53dc5044 PC |
366 | template<typename _Res, typename... _ArgTypes> |
367 | struct is_function<_Res(_ArgTypes...) const volatile> | |
368 | : public true_type { }; | |
123c516a | 369 | |
53dc5044 PC |
370 | template<typename _Res, typename... _ArgTypes> |
371 | struct is_function<_Res(_ArgTypes......) const volatile> | |
372 | : public true_type { }; | |
373 | ||
1e673415 PC |
374 | template<typename> |
375 | struct __is_nullptr_t_helper | |
376 | : public false_type { }; | |
123c516a PC |
377 | |
378 | template<> | |
379 | struct __is_nullptr_t_helper<std::nullptr_t> | |
380 | : public true_type { }; | |
1e673415 PC |
381 | |
382 | // __is_nullptr_t (extension). | |
383 | template<typename _Tp> | |
384 | struct __is_nullptr_t | |
385 | : public integral_constant<bool, (__is_nullptr_t_helper<typename | |
386 | remove_cv<_Tp>::type>::value)> | |
387 | { }; | |
388 | ||
123c516a PC |
389 | // composite type categories. |
390 | ||
391 | /// is_reference | |
392 | template<typename _Tp> | |
393 | struct is_reference | |
394 | : public __or_<is_lvalue_reference<_Tp>, | |
395 | is_rvalue_reference<_Tp>>::type | |
396 | { }; | |
397 | ||
53dc5044 PC |
398 | /// is_arithmetic |
399 | template<typename _Tp> | |
400 | struct is_arithmetic | |
123c516a | 401 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
402 | { }; |
403 | ||
404 | /// is_fundamental | |
405 | template<typename _Tp> | |
406 | struct is_fundamental | |
123c516a | 407 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>>::type |
53dc5044 PC |
408 | { }; |
409 | ||
410 | /// is_object | |
411 | template<typename _Tp> | |
412 | struct is_object | |
123c516a PC |
413 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
414 | is_void<_Tp>>>::type | |
53dc5044 PC |
415 | { }; |
416 | ||
123c516a | 417 | template<typename> |
53dc5044 PC |
418 | struct is_member_pointer; |
419 | ||
420 | /// is_scalar | |
421 | template<typename _Tp> | |
422 | struct is_scalar | |
123c516a PC |
423 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
424 | is_member_pointer<_Tp>, __is_nullptr_t<_Tp>>::type | |
53dc5044 PC |
425 | { }; |
426 | ||
427 | /// is_compound | |
428 | template<typename _Tp> | |
429 | struct is_compound | |
430 | : public integral_constant<bool, !is_fundamental<_Tp>::value> { }; | |
431 | ||
432 | /// is_member_pointer | |
433 | template<typename _Tp> | |
434 | struct __is_member_pointer_helper | |
435 | : public false_type { }; | |
123c516a PC |
436 | |
437 | template<typename _Tp, typename _Cp> | |
438 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
439 | : public true_type { }; | |
53dc5044 PC |
440 | |
441 | template<typename _Tp> | |
123c516a | 442 | struct is_member_pointer |
53dc5044 PC |
443 | : public integral_constant<bool, (__is_member_pointer_helper< |
444 | typename remove_cv<_Tp>::type>::value)> | |
445 | { }; | |
446 | ||
447 | // type properties. | |
123c516a | 448 | |
53dc5044 PC |
449 | /// is_const |
450 | template<typename> | |
451 | struct is_const | |
452 | : public false_type { }; | |
453 | ||
454 | template<typename _Tp> | |
455 | struct is_const<_Tp const> | |
456 | : public true_type { }; | |
457 | ||
458 | /// is_volatile | |
459 | template<typename> | |
460 | struct is_volatile | |
461 | : public false_type { }; | |
462 | ||
463 | template<typename _Tp> | |
464 | struct is_volatile<_Tp volatile> | |
465 | : public true_type { }; | |
466 | ||
123c516a PC |
467 | /// is_trivial |
468 | template<typename _Tp> | |
469 | struct is_trivial | |
470 | : public integral_constant<bool, __is_trivial(_Tp)> | |
471 | { }; | |
472 | ||
473 | /// is_trivially_copyable (still unimplemented) | |
474 | ||
475 | /// is_standard_layout | |
476 | template<typename _Tp> | |
477 | struct is_standard_layout | |
478 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
479 | { }; | |
480 | ||
481 | /// is_pod | |
482 | // Could use is_standard_layout && is_trivial instead of the builtin. | |
483 | template<typename _Tp> | |
484 | struct is_pod | |
485 | : public integral_constant<bool, __is_pod(_Tp)> | |
486 | { }; | |
487 | ||
488 | /// is_literal_type | |
489 | template<typename _Tp> | |
490 | struct is_literal_type | |
491 | : public integral_constant<bool, __is_literal_type(_Tp)> | |
492 | { }; | |
493 | ||
53dc5044 PC |
494 | /// is_empty |
495 | template<typename _Tp> | |
496 | struct is_empty | |
497 | : public integral_constant<bool, __is_empty(_Tp)> | |
498 | { }; | |
499 | ||
500 | /// is_polymorphic | |
501 | template<typename _Tp> | |
502 | struct is_polymorphic | |
503 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
504 | { }; | |
505 | ||
506 | /// is_abstract | |
507 | template<typename _Tp> | |
508 | struct is_abstract | |
509 | : public integral_constant<bool, __is_abstract(_Tp)> | |
510 | { }; | |
511 | ||
123c516a PC |
512 | template<typename _Tp, |
513 | bool = is_integral<_Tp>::value, | |
514 | bool = is_floating_point<_Tp>::value> | |
515 | struct __is_signed_helper | |
516 | : public false_type { }; | |
517 | ||
53dc5044 | 518 | template<typename _Tp> |
123c516a PC |
519 | struct __is_signed_helper<_Tp, false, true> |
520 | : public true_type { }; | |
521 | ||
522 | template<typename _Tp> | |
523 | struct __is_signed_helper<_Tp, true, false> | |
524 | : public integral_constant<bool, static_cast<bool>(_Tp(-1) < _Tp(0))> | |
53dc5044 PC |
525 | { }; |
526 | ||
123c516a | 527 | /// is_signed |
53dc5044 | 528 | template<typename _Tp> |
123c516a PC |
529 | struct is_signed |
530 | : public integral_constant<bool, __is_signed_helper<_Tp>::value> | |
531 | { }; | |
532 | ||
533 | /// is_unsigned | |
534 | template<typename _Tp> | |
535 | struct is_unsigned | |
536 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type | |
537 | { }; | |
538 | ||
539 | ||
540 | // destructible and constructible type properties | |
541 | ||
53dc5044 | 542 | template<typename> |
123c516a | 543 | struct add_rvalue_reference; |
53dc5044 PC |
544 | |
545 | template<typename _Tp> | |
123c516a | 546 | typename add_rvalue_reference<_Tp>::type declval() noexcept; |
53dc5044 | 547 | |
123c516a PC |
548 | template<typename, unsigned = 0> |
549 | struct extent; | |
550 | ||
551 | template<typename> | |
552 | struct remove_all_extents; | |
553 | ||
554 | template<typename _Tp> | |
555 | struct __is_array_known_bounds | |
556 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
557 | { }; |
558 | ||
123c516a PC |
559 | template<typename _Tp> |
560 | struct __is_array_unknown_bounds | |
561 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>::type | |
53dc5044 | 562 | { }; |
2c7a09d7 PC |
563 | |
564 | // In N3290 is_destructible does not say anything about function | |
565 | // types and abstract types, see LWG 2049. This implementation | |
566 | // describes function types as trivially nothrow destructible and | |
567 | // abstract types as destructible, iff the explicit destructor | |
568 | // call expression is wellformed. | |
123c516a PC |
569 | struct __do_is_destructible_impl_1 |
570 | { | |
571 | template<typename _Up> | |
572 | struct __w { _Up __u; }; | |
53dc5044 | 573 | |
123c516a PC |
574 | template<typename _Tp, typename |
575 | = decltype(declval<__w<_Tp>&>().~__w<_Tp>())> | |
576 | static true_type __test(int); | |
577 | ||
578 | template<typename> | |
579 | static false_type __test(...); | |
580 | }; | |
53dc5044 PC |
581 | |
582 | template<typename _Tp> | |
123c516a PC |
583 | struct __is_destructible_impl_1 |
584 | : public __do_is_destructible_impl_1 | |
585 | { | |
586 | typedef decltype(__test<_Tp>(0)) type; | |
587 | }; | |
53dc5044 | 588 | |
2c7a09d7 | 589 | // Special implementation for abstract types |
123c516a PC |
590 | struct __do_is_destructible_impl_2 |
591 | { | |
592 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> | |
593 | static true_type __test(int); | |
594 | ||
595 | template<typename> | |
596 | static false_type __test(...); | |
597 | }; | |
53dc5044 | 598 | |
53dc5044 | 599 | template<typename _Tp> |
123c516a PC |
600 | struct __is_destructible_impl_2 |
601 | : public __do_is_destructible_impl_2 | |
602 | { | |
603 | typedef decltype(__test<_Tp>(0)) type; | |
604 | }; | |
605 | ||
606 | template<typename _Tp, | |
607 | bool = __or_<is_void<_Tp>, | |
608 | __is_array_unknown_bounds<_Tp>>::value, | |
609 | bool = __or_<is_reference<_Tp>, is_function<_Tp>>::value> | |
610 | struct __is_destructible_safe; | |
53dc5044 PC |
611 | |
612 | template<typename _Tp> | |
123c516a PC |
613 | struct __is_destructible_safe<_Tp, false, false> |
614 | : public conditional<is_abstract<_Tp>::value, | |
615 | __is_destructible_impl_2<_Tp>, | |
616 | __is_destructible_impl_1<_Tp>>::type::type | |
617 | { }; | |
618 | ||
53dc5044 | 619 | template<typename _Tp> |
123c516a PC |
620 | struct __is_destructible_safe<_Tp, true, false> |
621 | : public false_type { }; | |
53dc5044 PC |
622 | |
623 | template<typename _Tp> | |
123c516a PC |
624 | struct __is_destructible_safe<_Tp, false, true> |
625 | : public true_type { }; | |
626 | ||
627 | /// is_destructible | |
53dc5044 | 628 | template<typename _Tp> |
123c516a PC |
629 | struct is_destructible |
630 | : public integral_constant<bool, (__is_destructible_safe<_Tp>::value)> | |
631 | { }; | |
632 | ||
633 | struct __do_is_default_constructible_impl | |
634 | { | |
635 | template<typename _Tp, typename = decltype(_Tp())> | |
636 | static true_type __test(int); | |
637 | ||
638 | template<typename> | |
639 | static false_type __test(...); | |
640 | }; | |
641 | ||
642 | template<typename _Tp> | |
643 | struct __is_default_constructible_impl | |
644 | : public __do_is_default_constructible_impl | |
53dc5044 | 645 | { |
123c516a | 646 | typedef decltype(__test<_Tp>(0)) type; |
53dc5044 | 647 | }; |
53dc5044 PC |
648 | |
649 | template<typename _Tp> | |
123c516a | 650 | struct __is_default_constructible_atom |
2c7a09d7 PC |
651 | : public __and_<__not_<is_void<_Tp>>, |
652 | __is_default_constructible_impl<_Tp>>::type | |
123c516a | 653 | { }; |
53dc5044 | 654 | |
123c516a PC |
655 | template<typename _Tp, bool = is_array<_Tp>::value> |
656 | struct __is_default_constructible_safe; | |
53dc5044 | 657 | |
2c7a09d7 PC |
658 | // The following technique is a workaround for a current core language |
659 | // restriction, which does not allow for array types to occur in | |
660 | // functional casts of the form T(). Complete arrays can be default- | |
661 | // constructed, if the element type is default-constructible, but | |
662 | // arrays with unknown bounds are not. | |
53dc5044 | 663 | template<typename _Tp> |
123c516a PC |
664 | struct __is_default_constructible_safe<_Tp, true> |
665 | : public __and_<__is_array_known_bounds<_Tp>, | |
666 | __is_default_constructible_atom<typename | |
2c7a09d7 | 667 | remove_all_extents<_Tp>::type>>::type |
53dc5044 PC |
668 | { }; |
669 | ||
53dc5044 | 670 | template<typename _Tp> |
123c516a PC |
671 | struct __is_default_constructible_safe<_Tp, false> |
672 | : public __is_default_constructible_atom<_Tp>::type | |
673 | { }; | |
4a27a739 | 674 | |
123c516a | 675 | /// is_default_constructible |
4a27a739 | 676 | template<typename _Tp> |
123c516a PC |
677 | struct is_default_constructible |
678 | : public integral_constant<bool, (__is_default_constructible_safe< | |
679 | _Tp>::value)> | |
680 | { }; | |
4a27a739 | 681 | |
2c7a09d7 PC |
682 | |
683 | // Implementation of is_constructible. | |
684 | ||
685 | // The hardest part of this trait is the binary direct-initialization | |
686 | // case, because we hit into a functional cast of the form T(arg). | |
687 | // This implementation uses different strategies depending on the | |
688 | // target type to reduce the test overhead as much as possible: | |
689 | // | |
690 | // a) For a reference target type, we use a static_cast expression | |
691 | // modulo its extra cases. | |
692 | // | |
693 | // b) For a non-reference target type we use a ::new expression. | |
123c516a PC |
694 | struct __do_is_static_castable_impl |
695 | { | |
696 | template<typename _From, typename _To, typename | |
697 | = decltype(static_cast<_To>(declval<_From>()))> | |
698 | static true_type __test(int); | |
4a27a739 | 699 | |
123c516a PC |
700 | template<typename, typename> |
701 | static false_type __test(...); | |
702 | }; | |
4a27a739 | 703 | |
123c516a PC |
704 | template<typename _From, typename _To> |
705 | struct __is_static_castable_impl | |
706 | : public __do_is_static_castable_impl | |
707 | { | |
708 | typedef decltype(__test<_From, _To>(0)) type; | |
709 | }; | |
939759fc | 710 | |
123c516a PC |
711 | template<typename _From, typename _To> |
712 | struct __is_static_castable_safe | |
2c7a09d7 | 713 | : public __is_static_castable_impl<_From, _To>::type |
4a27a739 PC |
714 | { }; |
715 | ||
123c516a PC |
716 | // __is_static_castable |
717 | template<typename _From, typename _To> | |
718 | struct __is_static_castable | |
719 | : public integral_constant<bool, (__is_static_castable_safe< | |
720 | _From, _To>::value)> | |
721 | { }; | |
939759fc | 722 | |
2c7a09d7 PC |
723 | // Implementation for non-reference types. To meet the proper |
724 | // variable definition semantics, we also need to test for | |
725 | // is_destructible in this case. | |
123c516a PC |
726 | struct __do_is_direct_constructible_impl |
727 | { | |
728 | template<typename _Tp, typename _Arg, typename | |
729 | = decltype(::new _Tp(declval<_Arg>()))> | |
730 | static true_type __test(int); | |
4a27a739 | 731 | |
123c516a PC |
732 | template<typename, typename> |
733 | static false_type __test(...); | |
734 | }; | |
4a27a739 | 735 | |
123c516a PC |
736 | template<typename _Tp, typename _Arg> |
737 | struct __is_direct_constructible_impl | |
738 | : public __do_is_direct_constructible_impl | |
739 | { | |
740 | typedef decltype(__test<_Tp, _Arg>(0)) type; | |
741 | }; | |
4a27a739 | 742 | |
123c516a PC |
743 | template<typename _Tp, typename _Arg> |
744 | struct __is_direct_constructible_new_safe | |
745 | : public __and_<is_destructible<_Tp>, | |
2c7a09d7 | 746 | __is_direct_constructible_impl<_Tp, _Arg>>::type |
123c516a | 747 | { }; |
4a27a739 | 748 | |
123c516a PC |
749 | template<typename, typename> |
750 | struct is_same; | |
4a27a739 | 751 | |
123c516a PC |
752 | template<typename, typename> |
753 | struct is_base_of; | |
4a27a739 | 754 | |
123c516a PC |
755 | template<typename> |
756 | struct remove_reference; | |
4a27a739 | 757 | |
123c516a PC |
758 | template<typename _From, typename _To, bool |
759 | = is_reference<_From>::value> | |
760 | struct __is_base_to_derived_ref; | |
4a27a739 | 761 | |
123c516a PC |
762 | template<typename _From, typename _To> |
763 | struct __is_base_to_derived_ref<_From, _To, true> | |
764 | { | |
765 | typedef typename remove_cv<typename remove_reference<_From | |
766 | >::type>::type __src_t; | |
767 | typedef typename remove_cv<typename remove_reference<_To | |
768 | >::type>::type __dst_t; | |
2c7a09d7 PC |
769 | typedef __and_<__not_<is_same<__src_t, __dst_t>>, |
770 | is_base_of<__src_t, __dst_t>> type; | |
123c516a PC |
771 | static constexpr bool value = type::value; |
772 | }; | |
4a27a739 | 773 | |
123c516a PC |
774 | template<typename _From, typename _To> |
775 | struct __is_base_to_derived_ref<_From, _To, false> | |
776 | : public false_type | |
4a27a739 PC |
777 | { }; |
778 | ||
123c516a PC |
779 | template<typename _From, typename _To, bool |
780 | = __and_<is_lvalue_reference<_From>, | |
781 | is_rvalue_reference<_To>>::value> | |
782 | struct __is_lvalue_to_rvalue_ref; | |
e133ace8 | 783 | |
123c516a PC |
784 | template<typename _From, typename _To> |
785 | struct __is_lvalue_to_rvalue_ref<_From, _To, true> | |
786 | { | |
787 | typedef typename remove_cv<typename remove_reference< | |
788 | _From>::type>::type __src_t; | |
789 | typedef typename remove_cv<typename remove_reference< | |
790 | _To>::type>::type __dst_t; | |
2c7a09d7 PC |
791 | typedef __or_<is_same<__src_t, __dst_t>, |
792 | is_base_of<__dst_t, __src_t>> type; | |
123c516a PC |
793 | static constexpr bool value = type::value; |
794 | }; | |
e133ace8 | 795 | |
123c516a PC |
796 | template<typename _From, typename _To> |
797 | struct __is_lvalue_to_rvalue_ref<_From, _To, false> | |
798 | : public false_type | |
e133ace8 PC |
799 | { }; |
800 | ||
2c7a09d7 PC |
801 | // Here we handle direct-initialization to a reference type as |
802 | // equivalent to a static_cast modulo overshooting conversions. | |
803 | // These are restricted to the following conversions: | |
804 | // a) A glvalue of a base class to a derived class reference | |
805 | // b) An lvalue to an rvalue-reference of reference-compatible | |
806 | // types | |
123c516a PC |
807 | template<typename _Tp, typename _Arg> |
808 | struct __is_direct_constructible_ref_cast | |
809 | : public __and_<__is_static_castable<_Arg, _Tp>, | |
810 | __not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>, | |
811 | __is_lvalue_to_rvalue_ref<_Arg, _Tp> | |
2c7a09d7 | 812 | >>>::type |
e133ace8 PC |
813 | { }; |
814 | ||
123c516a PC |
815 | template<typename _Tp, typename _Arg> |
816 | struct __is_direct_constructible_new | |
817 | : public conditional<is_reference<_Tp>::value, | |
818 | __is_direct_constructible_ref_cast<_Tp, _Arg>, | |
819 | __is_direct_constructible_new_safe<_Tp, _Arg> | |
820 | >::type | |
b0302c68 PC |
821 | { }; |
822 | ||
123c516a PC |
823 | template<typename _Tp, typename _Arg> |
824 | struct __is_direct_constructible | |
825 | : public integral_constant<bool, (__is_direct_constructible_new< | |
2c7a09d7 | 826 | _Tp, _Arg>::value)> |
e133ace8 PC |
827 | { }; |
828 | ||
2c7a09d7 PC |
829 | // Since default-construction and binary direct-initialization have |
830 | // been handled separately, the implementation of the remaining | |
831 | // n-ary construction cases is rather straightforward. | |
123c516a PC |
832 | struct __do_is_nary_constructible_impl |
833 | { | |
834 | template<typename _Tp, typename... _Args, typename | |
835 | = decltype(_Tp(declval<_Args>()...))> | |
836 | static true_type __test(int); | |
2b08f2c5 | 837 | |
123c516a PC |
838 | template<typename, typename...> |
839 | static false_type __test(...); | |
840 | }; | |
b0302c68 PC |
841 | |
842 | template<typename _Tp, typename... _Args> | |
123c516a PC |
843 | struct __is_nary_constructible_impl |
844 | : public __do_is_nary_constructible_impl | |
b0302c68 | 845 | { |
123c516a | 846 | typedef decltype(__test<_Tp, _Args...>(0)) type; |
b0302c68 PC |
847 | }; |
848 | ||
123c516a PC |
849 | template<typename _Tp, typename... _Args> |
850 | struct __is_nary_constructible | |
2c7a09d7 | 851 | : public __is_nary_constructible_impl<_Tp, _Args...>::type |
b0302c68 | 852 | { |
123c516a PC |
853 | static_assert(sizeof...(_Args) > 1, |
854 | "Only useful for > 1 arguments"); | |
855 | }; | |
b0302c68 | 856 | |
123c516a PC |
857 | template<typename _Tp, typename... _Args> |
858 | struct __is_constructible_impl | |
859 | : public __is_nary_constructible<_Tp, _Args...> | |
860 | { }; | |
b0302c68 | 861 | |
123c516a PC |
862 | template<typename _Tp, typename _Arg> |
863 | struct __is_constructible_impl<_Tp, _Arg> | |
864 | : public __is_direct_constructible<_Tp, _Arg> | |
865 | { }; | |
866 | ||
867 | template<typename _Tp> | |
868 | struct __is_constructible_impl<_Tp> | |
869 | : public is_default_constructible<_Tp> | |
870 | { }; | |
b0302c68 PC |
871 | |
872 | /// is_constructible | |
b0302c68 PC |
873 | template<typename _Tp, typename... _Args> |
874 | struct is_constructible | |
123c516a PC |
875 | : public integral_constant<bool, (__is_constructible_impl<_Tp, |
876 | _Args...>::value)> | |
c32097d8 JM |
877 | { }; |
878 | ||
65cee9bd PC |
879 | template<typename _Tp, bool = is_void<_Tp>::value> |
880 | struct __is_copy_constructible_impl; | |
123c516a | 881 | |
65cee9bd PC |
882 | template<typename _Tp> |
883 | struct __is_copy_constructible_impl<_Tp, true> | |
884 | : public false_type { }; | |
885 | ||
886 | template<typename _Tp> | |
887 | struct __is_copy_constructible_impl<_Tp, false> | |
888 | : public is_constructible<_Tp, const _Tp&> | |
889 | { }; | |
890 | ||
891 | /// is_copy_constructible | |
892 | template<typename _Tp> | |
893 | struct is_copy_constructible | |
894 | : public __is_copy_constructible_impl<_Tp> | |
895 | { }; | |
896 | ||
897 | template<typename _Tp, bool = is_void<_Tp>::value> | |
898 | struct __is_move_constructible_impl; | |
899 | ||
900 | template<typename _Tp> | |
901 | struct __is_move_constructible_impl<_Tp, true> | |
902 | : public false_type { }; | |
903 | ||
904 | template<typename _Tp> | |
905 | struct __is_move_constructible_impl<_Tp, false> | |
906 | : public is_constructible<_Tp, _Tp&&> | |
907 | { }; | |
908 | ||
909 | /// is_move_constructible | |
910 | template<typename _Tp> | |
911 | struct is_move_constructible | |
912 | : public __is_move_constructible_impl<_Tp> | |
913 | { }; | |
914 | ||
915 | template<typename _Tp> | |
916 | struct __is_nt_default_constructible_atom | |
917 | : public integral_constant<bool, noexcept(_Tp())> | |
918 | { }; | |
919 | ||
920 | template<typename _Tp, bool = is_array<_Tp>::value> | |
921 | struct __is_nt_default_constructible_impl; | |
922 | ||
923 | template<typename _Tp> | |
924 | struct __is_nt_default_constructible_impl<_Tp, true> | |
925 | : public __and_<__is_array_known_bounds<_Tp>, | |
926 | __is_nt_default_constructible_atom<typename | |
927 | remove_all_extents<_Tp>::type>>::type | |
928 | { }; | |
929 | ||
930 | template<typename _Tp> | |
931 | struct __is_nt_default_constructible_impl<_Tp, false> | |
932 | : public __is_nt_default_constructible_atom<_Tp> | |
933 | { }; | |
934 | ||
935 | /// is_nothrow_default_constructible | |
936 | template<typename _Tp> | |
937 | struct is_nothrow_default_constructible | |
938 | : public __and_<is_default_constructible<_Tp>, | |
939 | __is_nt_default_constructible_impl<_Tp>>::type | |
940 | { }; | |
e4f32cb0 PC |
941 | |
942 | template<typename _Tp, typename... _Args> | |
65cee9bd PC |
943 | struct __is_nt_constructible_impl |
944 | : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> | |
945 | { }; | |
e4f32cb0 PC |
946 | |
947 | template<typename _Tp, typename _Arg> | |
65cee9bd PC |
948 | struct __is_nt_constructible_impl<_Tp, _Arg> |
949 | : public integral_constant<bool, | |
950 | noexcept(static_cast<_Tp>(declval<_Arg>()))> | |
951 | { }; | |
952 | ||
953 | template<typename _Tp> | |
954 | struct __is_nt_constructible_impl<_Tp> | |
955 | : public is_nothrow_default_constructible<_Tp> | |
956 | { }; | |
e4f32cb0 PC |
957 | |
958 | /// is_nothrow_constructible | |
959 | template<typename _Tp, typename... _Args> | |
960 | struct is_nothrow_constructible | |
65cee9bd PC |
961 | : public __and_<is_constructible<_Tp, _Args...>, |
962 | __is_nt_constructible_impl<_Tp, _Args...>>::type | |
963 | { }; | |
964 | ||
965 | template<typename _Tp, bool = is_void<_Tp>::value> | |
966 | struct __is_nothrow_copy_constructible_impl; | |
967 | ||
968 | template<typename _Tp> | |
969 | struct __is_nothrow_copy_constructible_impl<_Tp, true> | |
970 | : public false_type { }; | |
971 | ||
972 | template<typename _Tp> | |
973 | struct __is_nothrow_copy_constructible_impl<_Tp, false> | |
974 | : public is_nothrow_constructible<_Tp, const _Tp&> | |
975 | { }; | |
976 | ||
977 | /// is_nothrow_copy_constructible | |
978 | template<typename _Tp> | |
979 | struct is_nothrow_copy_constructible | |
980 | : public __is_nothrow_copy_constructible_impl<_Tp> | |
981 | { }; | |
982 | ||
983 | template<typename _Tp, bool = is_void<_Tp>::value> | |
984 | struct __is_nothrow_move_constructible_impl; | |
985 | ||
986 | template<typename _Tp> | |
987 | struct __is_nothrow_move_constructible_impl<_Tp, true> | |
988 | : public false_type { }; | |
989 | ||
990 | template<typename _Tp> | |
991 | struct __is_nothrow_move_constructible_impl<_Tp, false> | |
992 | : public is_nothrow_constructible<_Tp, _Tp&&> | |
993 | { }; | |
994 | ||
995 | /// is_nothrow_move_constructible | |
996 | template<typename _Tp> | |
997 | struct is_nothrow_move_constructible | |
998 | : public __is_nothrow_move_constructible_impl<_Tp> | |
999 | { }; | |
1000 | ||
f263981a PC |
1001 | template<typename _Tp, typename _Up> |
1002 | class __is_assignable_helper | |
1003 | : public __sfinae_types | |
1004 | { | |
1005 | template<typename _Tp1, typename _Up1> | |
1006 | static decltype(declval<_Tp1>() = declval<_Up1>(), __one()) | |
1007 | __test(int); | |
1008 | ||
1009 | template<typename, typename> | |
1010 | static __two __test(...); | |
1011 | ||
1012 | public: | |
1013 | static constexpr bool value = sizeof(__test<_Tp, _Up>(0)) == 1; | |
1014 | }; | |
1015 | ||
1016 | /// is_assignable | |
1017 | template<typename _Tp, typename _Up> | |
1018 | struct is_assignable | |
1019 | : public integral_constant<bool, | |
1020 | __is_assignable_helper<_Tp, _Up>::value> | |
1021 | { }; | |
1022 | ||
1023 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1024 | struct __is_copy_assignable_impl; | |
1025 | ||
1026 | template<typename _Tp> | |
1027 | struct __is_copy_assignable_impl<_Tp, true> | |
1028 | : public false_type { }; | |
1029 | ||
1030 | template<typename _Tp> | |
1031 | struct __is_copy_assignable_impl<_Tp, false> | |
1032 | : public is_assignable<_Tp&, const _Tp&&> | |
1033 | { }; | |
1034 | ||
1035 | /// is_copy_assignable | |
1036 | template<typename _Tp> | |
1037 | struct is_copy_assignable | |
1038 | : public __is_copy_assignable_impl<_Tp> | |
1039 | { }; | |
1040 | ||
1041 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1042 | struct __is_move_assignable_impl; | |
1043 | ||
1044 | template<typename _Tp> | |
1045 | struct __is_move_assignable_impl<_Tp, true> | |
1046 | : public false_type { }; | |
1047 | ||
1048 | template<typename _Tp> | |
1049 | struct __is_move_assignable_impl<_Tp, false> | |
1050 | : public is_assignable<_Tp&, _Tp&&> | |
1051 | { }; | |
1052 | ||
1053 | /// is_move_assignable | |
1054 | template<typename _Tp> | |
1055 | struct is_move_assignable | |
1056 | : public __is_move_assignable_impl<_Tp> | |
1057 | { }; | |
1058 | ||
1059 | template<typename _Tp, typename _Up> | |
1060 | struct __is_nt_assignable_impl | |
1061 | : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())> | |
1062 | { }; | |
1063 | ||
1064 | /// is_nothrow_assignable | |
1065 | template<typename _Tp, typename _Up> | |
1066 | struct is_nothrow_assignable | |
1067 | : public __and_<is_assignable<_Tp, _Up>, | |
1068 | __is_nt_assignable_impl<_Tp, _Up>>::type | |
1069 | { }; | |
1070 | ||
1071 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1072 | struct __is_nt_copy_assignable_impl; | |
1073 | ||
1074 | template<typename _Tp> | |
1075 | struct __is_nt_copy_assignable_impl<_Tp, true> | |
1076 | : public false_type { }; | |
1077 | ||
1078 | template<typename _Tp> | |
1079 | struct __is_nt_copy_assignable_impl<_Tp, false> | |
1080 | : public is_nothrow_assignable<_Tp&, const _Tp&&> | |
1081 | { }; | |
1082 | ||
1083 | /// is_nothrow_copy_assignable | |
1084 | template<typename _Tp> | |
1085 | struct is_nothrow_copy_assignable | |
1086 | : public __is_nt_copy_assignable_impl<_Tp> | |
1087 | { }; | |
1088 | ||
1089 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1090 | struct __is_nt_move_assignable_impl; | |
1091 | ||
1092 | template<typename _Tp> | |
1093 | struct __is_nt_move_assignable_impl<_Tp, true> | |
1094 | : public false_type { }; | |
1095 | ||
1096 | template<typename _Tp> | |
1097 | struct __is_nt_move_assignable_impl<_Tp, false> | |
1098 | : public is_nothrow_assignable<_Tp&, _Tp&&> | |
1099 | { }; | |
1100 | ||
1101 | /// is_nothrow_move_assignable | |
65cee9bd | 1102 | template<typename _Tp> |
f263981a PC |
1103 | struct is_nothrow_move_assignable |
1104 | : public __is_nt_move_assignable_impl<_Tp> | |
e4f32cb0 PC |
1105 | { }; |
1106 | ||
939759fc | 1107 | /// has_trivial_default_constructor |
e133ace8 PC |
1108 | template<typename _Tp> |
1109 | struct has_trivial_default_constructor | |
1110 | : public integral_constant<bool, __has_trivial_constructor(_Tp)> | |
1111 | { }; | |
1112 | ||
939759fc | 1113 | /// has_trivial_copy_constructor |
e133ace8 PC |
1114 | template<typename _Tp> |
1115 | struct has_trivial_copy_constructor | |
1116 | : public integral_constant<bool, __has_trivial_copy(_Tp)> | |
1117 | { }; | |
1118 | ||
6f5e9b8d | 1119 | /// has_trivial_copy_assign |
e133ace8 | 1120 | template<typename _Tp> |
6f5e9b8d | 1121 | struct has_trivial_copy_assign |
e133ace8 PC |
1122 | : public integral_constant<bool, __has_trivial_assign(_Tp)> |
1123 | { }; | |
1124 | ||
939759fc | 1125 | /// has_trivial_destructor |
e133ace8 PC |
1126 | template<typename _Tp> |
1127 | struct has_trivial_destructor | |
1128 | : public integral_constant<bool, __has_trivial_destructor(_Tp)> | |
1129 | { }; | |
1130 | ||
123c516a PC |
1131 | /// has_virtual_destructor |
1132 | template<typename _Tp> | |
1133 | struct has_virtual_destructor | |
1134 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
1135 | { }; | |
1136 | ||
1137 | ||
1138 | // type property queries. | |
1139 | ||
1140 | /// alignment_of | |
1141 | template<typename _Tp> | |
1142 | struct alignment_of | |
1143 | : public integral_constant<std::size_t, __alignof__(_Tp)> { }; | |
1144 | ||
1145 | /// rank | |
1146 | template<typename> | |
1147 | struct rank | |
1148 | : public integral_constant<std::size_t, 0> { }; | |
1149 | ||
1150 | template<typename _Tp, std::size_t _Size> | |
1151 | struct rank<_Tp[_Size]> | |
1152 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1153 | ||
1154 | template<typename _Tp> | |
1155 | struct rank<_Tp[]> | |
1156 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1157 | ||
1158 | /// extent | |
1159 | template<typename, unsigned _Uint> | |
1160 | struct extent | |
1161 | : public integral_constant<std::size_t, 0> { }; | |
1162 | ||
1163 | template<typename _Tp, unsigned _Uint, std::size_t _Size> | |
1164 | struct extent<_Tp[_Size], _Uint> | |
1165 | : public integral_constant<std::size_t, | |
1166 | _Uint == 0 ? _Size : extent<_Tp, | |
1167 | _Uint - 1>::value> | |
1168 | { }; | |
1169 | ||
1170 | template<typename _Tp, unsigned _Uint> | |
1171 | struct extent<_Tp[], _Uint> | |
1172 | : public integral_constant<std::size_t, | |
1173 | _Uint == 0 ? 0 : extent<_Tp, | |
1174 | _Uint - 1>::value> | |
1175 | { }; | |
1176 | ||
1177 | ||
1178 | // type relations. | |
1179 | ||
1180 | /// is_same | |
1181 | template<typename, typename> | |
1182 | struct is_same | |
1183 | : public false_type { }; | |
1184 | ||
1185 | template<typename _Tp> | |
1186 | struct is_same<_Tp, _Tp> | |
1187 | : public true_type { }; | |
b0302c68 | 1188 | |
939759fc | 1189 | /// is_base_of |
e133ace8 PC |
1190 | template<typename _Base, typename _Derived> |
1191 | struct is_base_of | |
1192 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1193 | { }; | |
1194 | ||
297f34d7 | 1195 | template<typename _From, typename _To, |
123c516a PC |
1196 | bool = __or_<is_void<_From>, is_function<_To>, |
1197 | is_array<_To>>::value> | |
297f34d7 | 1198 | struct __is_convertible_helper |
f263981a | 1199 | { static constexpr bool value = is_void<_To>::value; }; |
297f34d7 | 1200 | |
e133ace8 | 1201 | template<typename _From, typename _To> |
b0302c68 | 1202 | class __is_convertible_helper<_From, _To, false> |
e133ace8 PC |
1203 | : public __sfinae_types |
1204 | { | |
8e7d962a PC |
1205 | template<typename _To1> |
1206 | static void __test_aux(_To1); | |
1207 | ||
1208 | template<typename _From1, typename _To1> | |
1209 | static decltype(__test_aux<_To1>(std::declval<_From1>()), __one()) | |
1210 | __test(int); | |
1211 | ||
1212 | template<typename, typename> | |
1213 | static __two __test(...); | |
297f34d7 | 1214 | |
e133ace8 | 1215 | public: |
f263981a | 1216 | static constexpr bool value = sizeof(__test<_From, _To>(0)) == 1; |
e133ace8 PC |
1217 | }; |
1218 | ||
b0302c68 | 1219 | /// is_convertible |
e133ace8 PC |
1220 | template<typename _From, typename _To> |
1221 | struct is_convertible | |
1222 | : public integral_constant<bool, | |
f263981a | 1223 | __is_convertible_helper<_From, _To>::value> |
e133ace8 PC |
1224 | { }; |
1225 | ||
b0302c68 | 1226 | /// is_explicitly_convertible |
75995f37 PC |
1227 | template<typename _From, typename _To> |
1228 | struct is_explicitly_convertible | |
1229 | : public is_constructible<_To, _From> | |
1230 | { }; | |
1231 | ||
fd735b6a | 1232 | |
123c516a | 1233 | // const-volatile modifications. |
7b50cdef | 1234 | |
123c516a | 1235 | /// remove_const |
7b50cdef | 1236 | template<typename _Tp> |
123c516a PC |
1237 | struct remove_const |
1238 | { typedef _Tp type; }; | |
7b50cdef | 1239 | |
123c516a PC |
1240 | template<typename _Tp> |
1241 | struct remove_const<_Tp const> | |
1242 | { typedef _Tp type; }; | |
1243 | ||
1244 | /// remove_volatile | |
1245 | template<typename _Tp> | |
1246 | struct remove_volatile | |
1247 | { typedef _Tp type; }; | |
7b50cdef | 1248 | |
123c516a PC |
1249 | template<typename _Tp> |
1250 | struct remove_volatile<_Tp volatile> | |
1251 | { typedef _Tp type; }; | |
1252 | ||
1253 | /// remove_cv | |
1254 | template<typename _Tp> | |
1255 | struct remove_cv | |
1256 | { | |
1257 | typedef typename | |
1258 | remove_const<typename remove_volatile<_Tp>::type>::type type; | |
1259 | }; | |
1260 | ||
1261 | /// add_const | |
1262 | template<typename _Tp> | |
1263 | struct add_const | |
1264 | { typedef _Tp const type; }; | |
1265 | ||
1266 | /// add_volatile | |
1267 | template<typename _Tp> | |
1268 | struct add_volatile | |
1269 | { typedef _Tp volatile type; }; | |
1270 | ||
1271 | /// add_cv | |
1272 | template<typename _Tp> | |
1273 | struct add_cv | |
1274 | { | |
1275 | typedef typename | |
1276 | add_const<typename add_volatile<_Tp>::type>::type type; | |
1277 | }; | |
7b50cdef | 1278 | |
7b50cdef | 1279 | |
123c516a | 1280 | // Reference transformations. |
7b50cdef | 1281 | |
123c516a PC |
1282 | /// remove_reference |
1283 | template<typename _Tp> | |
1284 | struct remove_reference | |
1285 | { typedef _Tp type; }; | |
7b50cdef | 1286 | |
123c516a PC |
1287 | template<typename _Tp> |
1288 | struct remove_reference<_Tp&> | |
1289 | { typedef _Tp type; }; | |
7b50cdef | 1290 | |
123c516a PC |
1291 | template<typename _Tp> |
1292 | struct remove_reference<_Tp&&> | |
1293 | { typedef _Tp type; }; | |
1294 | ||
1295 | template<typename _Tp, | |
1296 | bool = __and_<__not_<is_reference<_Tp>>, | |
1297 | __not_<is_void<_Tp>>>::value, | |
1298 | bool = is_rvalue_reference<_Tp>::value> | |
1299 | struct __add_lvalue_reference_helper | |
1300 | { typedef _Tp type; }; | |
7b50cdef | 1301 | |
5e108459 | 1302 | template<typename _Tp> |
123c516a PC |
1303 | struct __add_lvalue_reference_helper<_Tp, true, false> |
1304 | { typedef _Tp& type; }; | |
5e108459 | 1305 | |
5e108459 | 1306 | template<typename _Tp> |
123c516a PC |
1307 | struct __add_lvalue_reference_helper<_Tp, false, true> |
1308 | { typedef typename remove_reference<_Tp>::type& type; }; | |
5e108459 | 1309 | |
123c516a | 1310 | /// add_lvalue_reference |
5e108459 | 1311 | template<typename _Tp> |
123c516a PC |
1312 | struct add_lvalue_reference |
1313 | : public __add_lvalue_reference_helper<_Tp> | |
1314 | { }; | |
1315 | ||
1316 | template<typename _Tp, | |
1317 | bool = __and_<__not_<is_reference<_Tp>>, | |
1318 | __not_<is_void<_Tp>>>::value> | |
1319 | struct __add_rvalue_reference_helper | |
1320 | { typedef _Tp type; }; | |
5e108459 PC |
1321 | |
1322 | template<typename _Tp> | |
123c516a PC |
1323 | struct __add_rvalue_reference_helper<_Tp, true> |
1324 | { typedef _Tp&& type; }; | |
5e108459 | 1325 | |
123c516a | 1326 | /// add_rvalue_reference |
5e108459 | 1327 | template<typename _Tp> |
123c516a PC |
1328 | struct add_rvalue_reference |
1329 | : public __add_rvalue_reference_helper<_Tp> | |
1330 | { }; | |
5e108459 | 1331 | |
7b50cdef | 1332 | |
123c516a PC |
1333 | // sign modifications. |
1334 | ||
7b50cdef BK |
1335 | // Utility for constructing identically cv-qualified types. |
1336 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1337 | struct __cv_selector; | |
1338 | ||
1339 | template<typename _Unqualified> | |
1340 | struct __cv_selector<_Unqualified, false, false> | |
1341 | { typedef _Unqualified __type; }; | |
1342 | ||
1343 | template<typename _Unqualified> | |
1344 | struct __cv_selector<_Unqualified, false, true> | |
1345 | { typedef volatile _Unqualified __type; }; | |
1346 | ||
1347 | template<typename _Unqualified> | |
1348 | struct __cv_selector<_Unqualified, true, false> | |
1349 | { typedef const _Unqualified __type; }; | |
1350 | ||
1351 | template<typename _Unqualified> | |
1352 | struct __cv_selector<_Unqualified, true, true> | |
1353 | { typedef const volatile _Unqualified __type; }; | |
1354 | ||
1355 | template<typename _Qualified, typename _Unqualified, | |
1356 | bool _IsConst = is_const<_Qualified>::value, | |
1357 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1358 | class __match_cv_qualifiers |
7b50cdef | 1359 | { |
7b50cdef BK |
1360 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1361 | ||
1362 | public: | |
1363 | typedef typename __match::__type __type; | |
1364 | }; | |
1365 | ||
7b50cdef BK |
1366 | // Utility for finding the unsigned versions of signed integral types. |
1367 | template<typename _Tp> | |
e133ace8 PC |
1368 | struct __make_unsigned |
1369 | { typedef _Tp __type; }; | |
7b50cdef BK |
1370 | |
1371 | template<> | |
1372 | struct __make_unsigned<char> | |
1373 | { typedef unsigned char __type; }; | |
1374 | ||
1375 | template<> | |
1376 | struct __make_unsigned<signed char> | |
1377 | { typedef unsigned char __type; }; | |
1378 | ||
7b50cdef BK |
1379 | template<> |
1380 | struct __make_unsigned<short> | |
1381 | { typedef unsigned short __type; }; | |
1382 | ||
1383 | template<> | |
1384 | struct __make_unsigned<int> | |
1385 | { typedef unsigned int __type; }; | |
1386 | ||
1387 | template<> | |
1388 | struct __make_unsigned<long> | |
1389 | { typedef unsigned long __type; }; | |
1390 | ||
1391 | template<> | |
1392 | struct __make_unsigned<long long> | |
1393 | { typedef unsigned long long __type; }; | |
1394 | ||
7b50cdef BK |
1395 | // Select between integral and enum: not possible to be both. |
1396 | template<typename _Tp, | |
1397 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1398 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1399 | class __make_unsigned_selector; |
1400 | ||
7b50cdef | 1401 | template<typename _Tp> |
b0302c68 | 1402 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1403 | { |
7b50cdef BK |
1404 | typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt; |
1405 | typedef typename __unsignedt::__type __unsigned_type; | |
1406 | typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned; | |
1407 | ||
1408 | public: | |
1409 | typedef typename __cv_unsigned::__type __type; | |
1410 | }; | |
1411 | ||
7b50cdef | 1412 | template<typename _Tp> |
b0302c68 | 1413 | class __make_unsigned_selector<_Tp, false, true> |
7b50cdef | 1414 | { |
a0230468 MM |
1415 | // With -fshort-enums, an enum may be as small as a char. |
1416 | typedef unsigned char __smallest; | |
1417 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1418 | static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short); | |
ce2e6349 | 1419 | static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int); |
a0230468 MM |
1420 | typedef conditional<__b2, unsigned int, unsigned long> __cond2; |
1421 | typedef typename __cond2::type __cond2_type; | |
1422 | typedef conditional<__b1, unsigned short, __cond2_type> __cond1; | |
1423 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1424 | |
1425 | public: | |
a0230468 | 1426 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1427 | }; |
1428 | ||
7b50cdef BK |
1429 | // Given an integral/enum type, return the corresponding unsigned |
1430 | // integer type. | |
5b9daa7e BK |
1431 | // Primary template. |
1432 | /// make_unsigned | |
7b50cdef BK |
1433 | template<typename _Tp> |
1434 | struct make_unsigned | |
1435 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; | |
1436 | ||
1437 | // Integral, but don't define. | |
1438 | template<> | |
1439 | struct make_unsigned<bool>; | |
1440 | ||
1441 | ||
1442 | // Utility for finding the signed versions of unsigned integral types. | |
1443 | template<typename _Tp> | |
e133ace8 PC |
1444 | struct __make_signed |
1445 | { typedef _Tp __type; }; | |
7b50cdef BK |
1446 | |
1447 | template<> | |
1448 | struct __make_signed<char> | |
1449 | { typedef signed char __type; }; | |
1450 | ||
1451 | template<> | |
1452 | struct __make_signed<unsigned char> | |
1453 | { typedef signed char __type; }; | |
1454 | ||
7b50cdef BK |
1455 | template<> |
1456 | struct __make_signed<unsigned short> | |
1457 | { typedef signed short __type; }; | |
1458 | ||
1459 | template<> | |
1460 | struct __make_signed<unsigned int> | |
1461 | { typedef signed int __type; }; | |
1462 | ||
1463 | template<> | |
1464 | struct __make_signed<unsigned long> | |
1465 | { typedef signed long __type; }; | |
1466 | ||
1467 | template<> | |
1468 | struct __make_signed<unsigned long long> | |
1469 | { typedef signed long long __type; }; | |
1470 | ||
fb8ffd10 | 1471 | // Select between integral and enum: not possible to be both. |
7b50cdef BK |
1472 | template<typename _Tp, |
1473 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1474 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1475 | class __make_signed_selector; |
1476 | ||
7b50cdef | 1477 | template<typename _Tp> |
b0302c68 | 1478 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1479 | { |
7b50cdef BK |
1480 | typedef __make_signed<typename remove_cv<_Tp>::type> __signedt; |
1481 | typedef typename __signedt::__type __signed_type; | |
1482 | typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed; | |
1483 | ||
1484 | public: | |
1485 | typedef typename __cv_signed::__type __type; | |
1486 | }; | |
1487 | ||
7b50cdef | 1488 | template<typename _Tp> |
b0302c68 | 1489 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1490 | { |
a0230468 MM |
1491 | // With -fshort-enums, an enum may be as small as a char. |
1492 | typedef signed char __smallest; | |
1493 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1494 | static const bool __b1 = sizeof(_Tp) <= sizeof(signed short); | |
ce2e6349 | 1495 | static const bool __b2 = sizeof(_Tp) <= sizeof(signed int); |
a0230468 MM |
1496 | typedef conditional<__b2, signed int, signed long> __cond2; |
1497 | typedef typename __cond2::type __cond2_type; | |
1498 | typedef conditional<__b1, signed short, __cond2_type> __cond1; | |
1499 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1500 | |
1501 | public: | |
a0230468 | 1502 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1503 | }; |
1504 | ||
7b50cdef BK |
1505 | // Given an integral/enum type, return the corresponding signed |
1506 | // integer type. | |
5b9daa7e BK |
1507 | // Primary template. |
1508 | /// make_signed | |
7b50cdef BK |
1509 | template<typename _Tp> |
1510 | struct make_signed | |
1511 | { typedef typename __make_signed_selector<_Tp>::__type type; }; | |
1512 | ||
1513 | // Integral, but don't define. | |
1514 | template<> | |
1515 | struct make_signed<bool>; | |
cfa9a96b | 1516 | |
123c516a PC |
1517 | |
1518 | // array modifications. | |
1519 | ||
1520 | /// remove_extent | |
1521 | template<typename _Tp> | |
1522 | struct remove_extent | |
1523 | { typedef _Tp type; }; | |
1524 | ||
1525 | template<typename _Tp, std::size_t _Size> | |
1526 | struct remove_extent<_Tp[_Size]> | |
1527 | { typedef _Tp type; }; | |
1528 | ||
1529 | template<typename _Tp> | |
1530 | struct remove_extent<_Tp[]> | |
1531 | { typedef _Tp type; }; | |
1532 | ||
1533 | /// remove_all_extents | |
1534 | template<typename _Tp> | |
1535 | struct remove_all_extents | |
1536 | { typedef _Tp type; }; | |
1537 | ||
1538 | template<typename _Tp, std::size_t _Size> | |
1539 | struct remove_all_extents<_Tp[_Size]> | |
1540 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1541 | ||
1542 | template<typename _Tp> | |
1543 | struct remove_all_extents<_Tp[]> | |
1544 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1545 | ||
1546 | ||
1547 | // pointer modifications. | |
1548 | ||
1549 | template<typename _Tp, typename> | |
1550 | struct __remove_pointer_helper | |
1551 | { typedef _Tp type; }; | |
1552 | ||
1553 | template<typename _Tp, typename _Up> | |
1554 | struct __remove_pointer_helper<_Tp, _Up*> | |
1555 | { typedef _Up type; }; | |
1556 | ||
1557 | /// remove_pointer | |
1558 | template<typename _Tp> | |
1559 | struct remove_pointer | |
1560 | : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> | |
1561 | { }; | |
1562 | ||
1563 | /// add_pointer | |
1564 | template<typename _Tp> | |
1565 | struct add_pointer | |
1566 | { typedef typename remove_reference<_Tp>::type* type; }; | |
1567 | ||
1568 | ||
1569 | template<std::size_t _Len> | |
1570 | struct __aligned_storage_msa | |
1571 | { | |
1572 | union __type | |
1573 | { | |
1574 | unsigned char __data[_Len]; | |
1575 | struct __attribute__((__aligned__)) { } __align; | |
1576 | }; | |
1577 | }; | |
1578 | ||
1579 | /** | |
1580 | * @brief Alignment type. | |
1581 | * | |
1582 | * The value of _Align is a default-alignment which shall be the | |
1583 | * most stringent alignment requirement for any C++ object type | |
1584 | * whose size is no greater than _Len (3.9). The member typedef | |
1585 | * type shall be a POD type suitable for use as uninitialized | |
1586 | * storage for any object whose size is at most _Len and whose | |
1587 | * alignment is a divisor of _Align. | |
1588 | */ | |
1589 | template<std::size_t _Len, std::size_t _Align = | |
1590 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
1591 | struct aligned_storage | |
1592 | { | |
1593 | union type | |
1594 | { | |
1595 | unsigned char __data[_Len]; | |
1596 | struct __attribute__((__aligned__((_Align)))) { } __align; | |
1597 | }; | |
1598 | }; | |
1599 | ||
1600 | ||
1601 | // Decay trait for arrays and functions, used for perfect forwarding | |
1602 | // in make_pair, make_tuple, etc. | |
1603 | template<typename _Up, | |
1604 | bool _IsArray = is_array<_Up>::value, | |
1605 | bool _IsFunction = is_function<_Up>::value> | |
1606 | struct __decay_selector; | |
1607 | ||
1608 | // NB: DR 705. | |
1609 | template<typename _Up> | |
1610 | struct __decay_selector<_Up, false, false> | |
1611 | { typedef typename remove_cv<_Up>::type __type; }; | |
1612 | ||
1613 | template<typename _Up> | |
1614 | struct __decay_selector<_Up, true, false> | |
1615 | { typedef typename remove_extent<_Up>::type* __type; }; | |
1616 | ||
1617 | template<typename _Up> | |
1618 | struct __decay_selector<_Up, false, true> | |
1619 | { typedef typename add_pointer<_Up>::type __type; }; | |
1620 | ||
1621 | /// decay | |
1622 | template<typename _Tp> | |
1623 | class decay | |
1624 | { | |
1625 | typedef typename remove_reference<_Tp>::type __remove_type; | |
1626 | ||
1627 | public: | |
1628 | typedef typename __decay_selector<__remove_type>::__type type; | |
1629 | }; | |
1630 | ||
1631 | template<typename _Tp> | |
1632 | class reference_wrapper; | |
1633 | ||
1634 | // Helper which adds a reference to a type when given a reference_wrapper | |
1635 | template<typename _Tp> | |
1636 | struct __strip_reference_wrapper | |
1637 | { | |
1638 | typedef _Tp __type; | |
1639 | }; | |
1640 | ||
1641 | template<typename _Tp> | |
1642 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
1643 | { | |
1644 | typedef _Tp& __type; | |
1645 | }; | |
1646 | ||
1647 | template<typename _Tp> | |
1648 | struct __strip_reference_wrapper<const reference_wrapper<_Tp> > | |
1649 | { | |
1650 | typedef _Tp& __type; | |
1651 | }; | |
1652 | ||
1653 | template<typename _Tp> | |
1654 | struct __decay_and_strip | |
1655 | { | |
1656 | typedef typename __strip_reference_wrapper< | |
1657 | typename decay<_Tp>::type>::__type __type; | |
1658 | }; | |
1659 | ||
1660 | ||
1661 | // Define a nested type if some predicate holds. | |
1662 | // Primary template. | |
1663 | /// enable_if | |
1664 | template<bool, typename _Tp = void> | |
1665 | struct enable_if | |
1666 | { }; | |
1667 | ||
1668 | // Partial specialization for true. | |
1669 | template<typename _Tp> | |
1670 | struct enable_if<true, _Tp> | |
1671 | { typedef _Tp type; }; | |
1672 | ||
1673 | ||
1674 | // A conditional expression, but for types. If true, first, if false, second. | |
1675 | // Primary template. | |
1676 | /// conditional | |
1677 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
1678 | struct conditional | |
1679 | { typedef _Iftrue type; }; | |
1680 | ||
1681 | // Partial specialization for false. | |
1682 | template<typename _Iftrue, typename _Iffalse> | |
1683 | struct conditional<false, _Iftrue, _Iffalse> | |
1684 | { typedef _Iffalse type; }; | |
1685 | ||
1686 | ||
5b9daa7e | 1687 | /// common_type |
cfa9a96b CF |
1688 | template<typename... _Tp> |
1689 | struct common_type; | |
1690 | ||
1691 | template<typename _Tp> | |
1692 | struct common_type<_Tp> | |
7274deff | 1693 | { typedef _Tp type; }; |
cfa9a96b CF |
1694 | |
1695 | template<typename _Tp, typename _Up> | |
7274deff PC |
1696 | struct common_type<_Tp, _Up> |
1697 | { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; }; | |
cfa9a96b CF |
1698 | |
1699 | template<typename _Tp, typename _Up, typename... _Vp> | |
1700 | struct common_type<_Tp, _Up, _Vp...> | |
1701 | { | |
1702 | typedef typename | |
1703 | common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type; | |
1704 | }; | |
7274deff | 1705 | |
a47407f6 PC |
1706 | /// underlying_type |
1707 | template<typename _Tp> | |
1708 | struct underlying_type | |
1709 | { | |
1710 | typedef __underlying_type(_Tp) type; | |
1711 | }; | |
123c516a | 1712 | |
7274deff PC |
1713 | /// declval |
1714 | template<typename _Tp> | |
1715 | struct __declval_protector | |
1716 | { | |
1717 | static const bool __stop = false; | |
1718 | static typename add_rvalue_reference<_Tp>::type __delegate(); | |
1719 | }; | |
1720 | ||
1721 | template<typename _Tp> | |
1722 | inline typename add_rvalue_reference<_Tp>::type | |
e4f32cb0 | 1723 | declval() noexcept |
7274deff PC |
1724 | { |
1725 | static_assert(__declval_protector<_Tp>::__stop, | |
1726 | "declval() must not be used!"); | |
1727 | return __declval_protector<_Tp>::__delegate(); | |
1728 | } | |
1041daba | 1729 | |
be7f7822 JW |
1730 | /// result_of |
1731 | template<typename _Signature> | |
1732 | class result_of; | |
1733 | ||
1734 | template<typename _MemPtr, typename _Arg> | |
1735 | struct _Result_of_memobj; | |
1736 | ||
1737 | template<typename _Res, typename _Class, typename _Arg> | |
1738 | struct _Result_of_memobj<_Res _Class::*, _Arg> | |
1739 | { | |
1740 | private: | |
1741 | typedef _Res _Class::* _Func; | |
1742 | ||
1743 | template<typename _Tp> | |
1744 | static _Tp _S_get(const _Class&); | |
1745 | template<typename _Tp> | |
1746 | static decltype(*std::declval<_Tp>()) _S_get(...); | |
1747 | ||
1748 | public: | |
1749 | typedef | |
1750 | decltype(_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>()) | |
1751 | __type; | |
1752 | }; | |
1753 | ||
1754 | template<typename _MemPtr, typename _Arg, typename... _ArgTypes> | |
1755 | struct _Result_of_memfun; | |
1756 | ||
1757 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
1758 | struct _Result_of_memfun<_Res _Class::*, _Arg, _Args...> | |
1759 | { | |
1760 | private: | |
1761 | typedef _Res _Class::* _Func; | |
1762 | ||
1763 | template<typename _Tp> | |
1764 | static _Tp _S_get(const _Class&); | |
1765 | template<typename _Tp> | |
1766 | static decltype(*std::declval<_Tp>()) _S_get(...); | |
1767 | ||
1768 | public: | |
1769 | typedef | |
1770 | decltype((_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>()) | |
1771 | (std::declval<_Args>()...) ) | |
1772 | __type; | |
1773 | }; | |
1774 | ||
1775 | template<bool, bool, typename _Functor, typename... _ArgTypes> | |
1776 | struct _Result_of_impl; | |
1777 | ||
1778 | template<typename _Functor, typename... _ArgTypes> | |
1779 | struct _Result_of_impl<false, false, _Functor, _ArgTypes...> | |
1780 | { | |
1781 | typedef | |
1782 | decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) ) | |
1783 | __type; | |
1784 | }; | |
1785 | ||
1786 | template<typename _MemPtr, typename _Arg> | |
1787 | struct _Result_of_impl<true, false, _MemPtr, _Arg> | |
1788 | : _Result_of_memobj<typename remove_reference<_MemPtr>::type, _Arg> | |
1789 | { | |
1790 | typedef typename _Result_of_memobj< | |
1791 | typename remove_reference<_MemPtr>::type, _Arg>::__type | |
1792 | __type; | |
1793 | }; | |
1794 | ||
1795 | template<typename _MemPtr, typename _Arg, typename... _ArgTypes> | |
1796 | struct _Result_of_impl<false, true, _MemPtr, _Arg, _ArgTypes...> | |
1797 | : _Result_of_memfun<typename remove_reference<_MemPtr>::type, _Arg, | |
1798 | _ArgTypes...> | |
1799 | { | |
1800 | typedef typename _Result_of_memfun< | |
1801 | typename remove_reference<_MemPtr>::type, _Arg, _ArgTypes...>::__type | |
1802 | __type; | |
1803 | }; | |
1804 | ||
1805 | template<typename _Functor, typename... _ArgTypes> | |
1806 | struct result_of<_Functor(_ArgTypes...)> | |
1807 | : _Result_of_impl<is_member_object_pointer< | |
1808 | typename remove_reference<_Functor>::type >::value, | |
1809 | is_member_function_pointer< | |
1810 | typename remove_reference<_Functor>::type >::value, | |
1811 | _Functor, _ArgTypes...> | |
1812 | { | |
1813 | typedef typename _Result_of_impl< | |
1814 | is_member_object_pointer< | |
1815 | typename remove_reference<_Functor>::type >::value, | |
1816 | is_member_function_pointer< | |
1817 | typename remove_reference<_Functor>::type >::value, | |
1818 | _Functor, _ArgTypes...>::__type | |
1819 | type; | |
1820 | }; | |
1821 | ||
033b71ce PC |
1822 | /** |
1823 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
1824 | * member type _NTYPE. | |
1825 | */ | |
1826 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ | |
1827 | template<typename _Tp> \ | |
1828 | class __has_##_NTYPE##_helper \ | |
1829 | : __sfinae_types \ | |
1830 | { \ | |
1831 | template<typename _Up> \ | |
1832 | struct _Wrap_type \ | |
1833 | { }; \ | |
1834 | \ | |
1835 | template<typename _Up> \ | |
1836 | static __one __test(_Wrap_type<typename _Up::_NTYPE>*); \ | |
1837 | \ | |
1838 | template<typename _Up> \ | |
1839 | static __two __test(...); \ | |
1840 | \ | |
1841 | public: \ | |
f263981a | 1842 | static constexpr bool value = sizeof(__test<_Tp>(0)) == 1; \ |
033b71ce PC |
1843 | }; \ |
1844 | \ | |
1845 | template<typename _Tp> \ | |
1846 | struct __has_##_NTYPE \ | |
1847 | : integral_constant<bool, __has_##_NTYPE##_helper \ | |
1848 | <typename remove_cv<_Tp>::type>::value> \ | |
1849 | { }; | |
1850 | ||
1041daba | 1851 | // @} group metaprogramming |
12ffa228 BK |
1852 | _GLIBCXX_END_NAMESPACE_VERSION |
1853 | } // namespace | |
7b50cdef | 1854 | |
57317d2a PC |
1855 | #endif // __GXX_EXPERIMENTAL_CXX0X__ |
1856 | ||
7274deff | 1857 | #endif // _GLIBCXX_TYPE_TRAITS |