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13901e4b | 1 | // C++11 type_traits -*- C++ -*- |
af13a7a6 | 2 | |
83ddb39f | 3 | // Copyright (C) 2007-2012 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 | 44 | /** |
13901e4b JW |
45 | * @defgroup metaprogramming Metaprogramming and type traits |
46 | * @ingroup utilities | |
47 | * | |
48 | * Template utilities for compile-time introspection and modification, | |
49 | * including type classification traits, type property inspection traits | |
50 | * and type transformation traits. | |
51 | * | |
5b9daa7e BK |
52 | * @{ |
53 | */ | |
ac65b7d2 DK |
54 | |
55 | /// integral_constant | |
56 | template<typename _Tp, _Tp __v> | |
57 | struct integral_constant | |
58 | { | |
59 | static constexpr _Tp value = __v; | |
60 | typedef _Tp value_type; | |
61 | typedef integral_constant<_Tp, __v> type; | |
62 | constexpr operator value_type() { return value; } | |
63 | }; | |
64 | ||
13901e4b | 65 | /// The type used as a compile-time boolean with true value. |
ac65b7d2 DK |
66 | typedef integral_constant<bool, true> true_type; |
67 | ||
13901e4b | 68 | /// The type used as a compile-time boolean with false value. |
ac65b7d2 DK |
69 | typedef integral_constant<bool, false> false_type; |
70 | ||
71 | template<typename _Tp, _Tp __v> | |
72 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
53dc5044 | 73 | |
123c516a | 74 | // Meta programming helper types. |
53dc5044 | 75 | |
123c516a PC |
76 | template<bool, typename, typename> |
77 | struct conditional; | |
53dc5044 | 78 | |
dd7b175e | 79 | template<typename...> |
123c516a PC |
80 | struct __or_; |
81 | ||
ac65b7d2 DK |
82 | template<> |
83 | struct __or_<> | |
84 | : public false_type | |
85 | { }; | |
86 | ||
dd7b175e PC |
87 | template<typename _B1> |
88 | struct __or_<_B1> | |
89 | : public _B1 | |
90 | { }; | |
91 | ||
123c516a PC |
92 | template<typename _B1, typename _B2> |
93 | struct __or_<_B1, _B2> | |
94 | : public conditional<_B1::value, _B1, _B2>::type | |
95 | { }; | |
96 | ||
97 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
98 | struct __or_<_B1, _B2, _B3, _Bn...> | |
99 | : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type | |
100 | { }; | |
53dc5044 | 101 | |
dd7b175e | 102 | template<typename...> |
123c516a | 103 | struct __and_; |
53dc5044 | 104 | |
ac65b7d2 DK |
105 | template<> |
106 | struct __and_<> | |
107 | : public true_type | |
108 | { }; | |
109 | ||
dd7b175e PC |
110 | template<typename _B1> |
111 | struct __and_<_B1> | |
112 | : public _B1 | |
113 | { }; | |
114 | ||
123c516a PC |
115 | template<typename _B1, typename _B2> |
116 | struct __and_<_B1, _B2> | |
117 | : public conditional<_B1::value, _B2, _B1>::type | |
118 | { }; | |
119 | ||
120 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
121 | struct __and_<_B1, _B2, _B3, _Bn...> | |
122 | : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type | |
123 | { }; | |
124 | ||
125 | template<typename _Pp> | |
126 | struct __not_ | |
127 | : public integral_constant<bool, !_Pp::value> | |
128 | { }; | |
129 | ||
ac65b7d2 DK |
130 | struct __sfinae_types |
131 | { | |
132 | typedef char __one; | |
133 | typedef struct { char __arr[2]; } __two; | |
134 | }; | |
53dc5044 | 135 | |
b3618b71 DK |
136 | // For several sfinae-friendly trait implementations we transport both the |
137 | // result information (as the member type) and the failure information (no | |
138 | // member type). This is very similar to std::enable_if, but we cannot use | |
139 | // them, because we need to derive from them as an implementation detail. | |
140 | ||
141 | template<typename _Tp> | |
142 | struct __success_type | |
143 | { typedef _Tp type; }; | |
144 | ||
145 | struct __failure_type | |
146 | { }; | |
147 | ||
123c516a PC |
148 | // primary type categories. |
149 | ||
53dc5044 PC |
150 | template<typename> |
151 | struct remove_cv; | |
152 | ||
153 | template<typename> | |
154 | struct __is_void_helper | |
155 | : public false_type { }; | |
53dc5044 | 156 | |
123c516a PC |
157 | template<> |
158 | struct __is_void_helper<void> | |
159 | : public true_type { }; | |
53dc5044 PC |
160 | |
161 | /// is_void | |
162 | template<typename _Tp> | |
163 | struct is_void | |
164 | : public integral_constant<bool, (__is_void_helper<typename | |
165 | remove_cv<_Tp>::type>::value)> | |
166 | { }; | |
167 | ||
168 | template<typename> | |
169 | struct __is_integral_helper | |
170 | : public false_type { }; | |
123c516a PC |
171 | |
172 | template<> | |
173 | struct __is_integral_helper<bool> | |
174 | : public true_type { }; | |
175 | ||
176 | template<> | |
177 | struct __is_integral_helper<char> | |
178 | : public true_type { }; | |
179 | ||
180 | template<> | |
181 | struct __is_integral_helper<signed char> | |
182 | : public true_type { }; | |
183 | ||
184 | template<> | |
185 | struct __is_integral_helper<unsigned char> | |
186 | : public true_type { }; | |
187 | ||
53dc5044 | 188 | #ifdef _GLIBCXX_USE_WCHAR_T |
123c516a PC |
189 | template<> |
190 | struct __is_integral_helper<wchar_t> | |
191 | : public true_type { }; | |
53dc5044 | 192 | #endif |
123c516a PC |
193 | |
194 | template<> | |
195 | struct __is_integral_helper<char16_t> | |
196 | : public true_type { }; | |
197 | ||
198 | template<> | |
199 | struct __is_integral_helper<char32_t> | |
200 | : public true_type { }; | |
201 | ||
202 | template<> | |
203 | struct __is_integral_helper<short> | |
204 | : public true_type { }; | |
205 | ||
206 | template<> | |
207 | struct __is_integral_helper<unsigned short> | |
208 | : public true_type { }; | |
209 | ||
210 | template<> | |
211 | struct __is_integral_helper<int> | |
212 | : public true_type { }; | |
213 | ||
214 | template<> | |
215 | struct __is_integral_helper<unsigned int> | |
216 | : public true_type { }; | |
217 | ||
218 | template<> | |
219 | struct __is_integral_helper<long> | |
220 | : public true_type { }; | |
221 | ||
222 | template<> | |
223 | struct __is_integral_helper<unsigned long> | |
224 | : public true_type { }; | |
225 | ||
226 | template<> | |
227 | struct __is_integral_helper<long long> | |
228 | : public true_type { }; | |
229 | ||
230 | template<> | |
231 | struct __is_integral_helper<unsigned long long> | |
232 | : public true_type { }; | |
53dc5044 | 233 | |
6d585f01 PC |
234 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128) |
235 | template<> | |
fd1e62c2 | 236 | struct __is_integral_helper<__int128> |
6d585f01 PC |
237 | : public true_type { }; |
238 | ||
239 | template<> | |
fd1e62c2 | 240 | struct __is_integral_helper<unsigned __int128> |
6d585f01 PC |
241 | : public true_type { }; |
242 | #endif | |
243 | ||
53dc5044 PC |
244 | /// is_integral |
245 | template<typename _Tp> | |
246 | struct is_integral | |
247 | : public integral_constant<bool, (__is_integral_helper<typename | |
248 | remove_cv<_Tp>::type>::value)> | |
249 | { }; | |
250 | ||
251 | template<typename> | |
252 | struct __is_floating_point_helper | |
253 | : public false_type { }; | |
123c516a PC |
254 | |
255 | template<> | |
256 | struct __is_floating_point_helper<float> | |
257 | : public true_type { }; | |
258 | ||
259 | template<> | |
260 | struct __is_floating_point_helper<double> | |
261 | : public true_type { }; | |
262 | ||
263 | template<> | |
264 | struct __is_floating_point_helper<long double> | |
265 | : public true_type { }; | |
53dc5044 | 266 | |
6d585f01 PC |
267 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
268 | template<> | |
269 | struct __is_floating_point_helper<__float128> | |
270 | : public true_type { }; | |
271 | #endif | |
272 | ||
53dc5044 PC |
273 | /// is_floating_point |
274 | template<typename _Tp> | |
275 | struct is_floating_point | |
276 | : public integral_constant<bool, (__is_floating_point_helper<typename | |
277 | remove_cv<_Tp>::type>::value)> | |
278 | { }; | |
279 | ||
280 | /// is_array | |
281 | template<typename> | |
282 | struct is_array | |
283 | : public false_type { }; | |
284 | ||
285 | template<typename _Tp, std::size_t _Size> | |
286 | struct is_array<_Tp[_Size]> | |
287 | : public true_type { }; | |
288 | ||
289 | template<typename _Tp> | |
290 | struct is_array<_Tp[]> | |
291 | : public true_type { }; | |
292 | ||
293 | template<typename> | |
294 | struct __is_pointer_helper | |
295 | : public false_type { }; | |
123c516a PC |
296 | |
297 | template<typename _Tp> | |
298 | struct __is_pointer_helper<_Tp*> | |
299 | : public true_type { }; | |
53dc5044 PC |
300 | |
301 | /// is_pointer | |
302 | template<typename _Tp> | |
303 | struct is_pointer | |
304 | : public integral_constant<bool, (__is_pointer_helper<typename | |
305 | remove_cv<_Tp>::type>::value)> | |
306 | { }; | |
307 | ||
123c516a PC |
308 | /// is_lvalue_reference |
309 | template<typename> | |
310 | struct is_lvalue_reference | |
311 | : public false_type { }; | |
312 | ||
53dc5044 | 313 | template<typename _Tp> |
123c516a PC |
314 | struct is_lvalue_reference<_Tp&> |
315 | : public true_type { }; | |
316 | ||
317 | /// is_rvalue_reference | |
318 | template<typename> | |
319 | struct is_rvalue_reference | |
320 | : public false_type { }; | |
53dc5044 | 321 | |
53dc5044 | 322 | template<typename _Tp> |
123c516a PC |
323 | struct is_rvalue_reference<_Tp&&> |
324 | : public true_type { }; | |
325 | ||
326 | template<typename> | |
53dc5044 PC |
327 | struct is_function; |
328 | ||
329 | template<typename> | |
330 | struct __is_member_object_pointer_helper | |
331 | : public false_type { }; | |
123c516a PC |
332 | |
333 | template<typename _Tp, typename _Cp> | |
334 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
335 | : public integral_constant<bool, !is_function<_Tp>::value> { }; | |
53dc5044 PC |
336 | |
337 | /// is_member_object_pointer | |
338 | template<typename _Tp> | |
339 | struct is_member_object_pointer | |
340 | : public integral_constant<bool, (__is_member_object_pointer_helper< | |
341 | typename remove_cv<_Tp>::type>::value)> | |
342 | { }; | |
343 | ||
344 | template<typename> | |
345 | struct __is_member_function_pointer_helper | |
346 | : public false_type { }; | |
123c516a PC |
347 | |
348 | template<typename _Tp, typename _Cp> | |
349 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
350 | : public integral_constant<bool, is_function<_Tp>::value> { }; | |
53dc5044 PC |
351 | |
352 | /// is_member_function_pointer | |
353 | template<typename _Tp> | |
354 | struct is_member_function_pointer | |
355 | : public integral_constant<bool, (__is_member_function_pointer_helper< | |
356 | typename remove_cv<_Tp>::type>::value)> | |
357 | { }; | |
358 | ||
359 | /// is_enum | |
360 | template<typename _Tp> | |
361 | struct is_enum | |
362 | : public integral_constant<bool, __is_enum(_Tp)> | |
363 | { }; | |
364 | ||
365 | /// is_union | |
366 | template<typename _Tp> | |
367 | struct is_union | |
368 | : public integral_constant<bool, __is_union(_Tp)> | |
369 | { }; | |
370 | ||
371 | /// is_class | |
372 | template<typename _Tp> | |
373 | struct is_class | |
374 | : public integral_constant<bool, __is_class(_Tp)> | |
375 | { }; | |
376 | ||
377 | /// is_function | |
378 | template<typename> | |
379 | struct is_function | |
380 | : public false_type { }; | |
123c516a | 381 | |
53dc5044 PC |
382 | template<typename _Res, typename... _ArgTypes> |
383 | struct is_function<_Res(_ArgTypes...)> | |
384 | : public true_type { }; | |
123c516a | 385 | |
53dc5044 PC |
386 | template<typename _Res, typename... _ArgTypes> |
387 | struct is_function<_Res(_ArgTypes......)> | |
388 | : public true_type { }; | |
123c516a | 389 | |
53dc5044 PC |
390 | template<typename _Res, typename... _ArgTypes> |
391 | struct is_function<_Res(_ArgTypes...) const> | |
392 | : public true_type { }; | |
123c516a | 393 | |
53dc5044 PC |
394 | template<typename _Res, typename... _ArgTypes> |
395 | struct is_function<_Res(_ArgTypes......) const> | |
396 | : public true_type { }; | |
123c516a | 397 | |
53dc5044 PC |
398 | template<typename _Res, typename... _ArgTypes> |
399 | struct is_function<_Res(_ArgTypes...) volatile> | |
400 | : public true_type { }; | |
123c516a | 401 | |
53dc5044 PC |
402 | template<typename _Res, typename... _ArgTypes> |
403 | struct is_function<_Res(_ArgTypes......) volatile> | |
404 | : public true_type { }; | |
123c516a | 405 | |
53dc5044 PC |
406 | template<typename _Res, typename... _ArgTypes> |
407 | struct is_function<_Res(_ArgTypes...) const volatile> | |
408 | : public true_type { }; | |
123c516a | 409 | |
53dc5044 PC |
410 | template<typename _Res, typename... _ArgTypes> |
411 | struct is_function<_Res(_ArgTypes......) const volatile> | |
412 | : public true_type { }; | |
413 | ||
1e673415 PC |
414 | template<typename> |
415 | struct __is_nullptr_t_helper | |
416 | : public false_type { }; | |
123c516a PC |
417 | |
418 | template<> | |
419 | struct __is_nullptr_t_helper<std::nullptr_t> | |
420 | : public true_type { }; | |
1e673415 PC |
421 | |
422 | // __is_nullptr_t (extension). | |
423 | template<typename _Tp> | |
424 | struct __is_nullptr_t | |
425 | : public integral_constant<bool, (__is_nullptr_t_helper<typename | |
426 | remove_cv<_Tp>::type>::value)> | |
427 | { }; | |
428 | ||
123c516a PC |
429 | // composite type categories. |
430 | ||
431 | /// is_reference | |
432 | template<typename _Tp> | |
433 | struct is_reference | |
434 | : public __or_<is_lvalue_reference<_Tp>, | |
435 | is_rvalue_reference<_Tp>>::type | |
436 | { }; | |
437 | ||
53dc5044 PC |
438 | /// is_arithmetic |
439 | template<typename _Tp> | |
440 | struct is_arithmetic | |
123c516a | 441 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
442 | { }; |
443 | ||
444 | /// is_fundamental | |
445 | template<typename _Tp> | |
446 | struct is_fundamental | |
123c516a | 447 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>>::type |
53dc5044 PC |
448 | { }; |
449 | ||
450 | /// is_object | |
451 | template<typename _Tp> | |
452 | struct is_object | |
123c516a PC |
453 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
454 | is_void<_Tp>>>::type | |
53dc5044 PC |
455 | { }; |
456 | ||
123c516a | 457 | template<typename> |
53dc5044 PC |
458 | struct is_member_pointer; |
459 | ||
460 | /// is_scalar | |
461 | template<typename _Tp> | |
462 | struct is_scalar | |
123c516a PC |
463 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
464 | is_member_pointer<_Tp>, __is_nullptr_t<_Tp>>::type | |
53dc5044 PC |
465 | { }; |
466 | ||
467 | /// is_compound | |
468 | template<typename _Tp> | |
469 | struct is_compound | |
470 | : public integral_constant<bool, !is_fundamental<_Tp>::value> { }; | |
471 | ||
53dc5044 PC |
472 | template<typename _Tp> |
473 | struct __is_member_pointer_helper | |
474 | : public false_type { }; | |
123c516a PC |
475 | |
476 | template<typename _Tp, typename _Cp> | |
477 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
478 | : public true_type { }; | |
53dc5044 | 479 | |
13901e4b | 480 | /// is_member_pointer |
53dc5044 | 481 | template<typename _Tp> |
123c516a | 482 | struct is_member_pointer |
53dc5044 PC |
483 | : public integral_constant<bool, (__is_member_pointer_helper< |
484 | typename remove_cv<_Tp>::type>::value)> | |
485 | { }; | |
486 | ||
487 | // type properties. | |
123c516a | 488 | |
53dc5044 PC |
489 | /// is_const |
490 | template<typename> | |
491 | struct is_const | |
492 | : public false_type { }; | |
493 | ||
494 | template<typename _Tp> | |
495 | struct is_const<_Tp const> | |
496 | : public true_type { }; | |
497 | ||
498 | /// is_volatile | |
499 | template<typename> | |
500 | struct is_volatile | |
501 | : public false_type { }; | |
502 | ||
503 | template<typename _Tp> | |
504 | struct is_volatile<_Tp volatile> | |
505 | : public true_type { }; | |
506 | ||
123c516a PC |
507 | /// is_trivial |
508 | template<typename _Tp> | |
509 | struct is_trivial | |
510 | : public integral_constant<bool, __is_trivial(_Tp)> | |
511 | { }; | |
512 | ||
13901e4b | 513 | // is_trivially_copyable (still unimplemented) |
123c516a PC |
514 | |
515 | /// is_standard_layout | |
516 | template<typename _Tp> | |
517 | struct is_standard_layout | |
518 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
519 | { }; | |
520 | ||
521 | /// is_pod | |
522 | // Could use is_standard_layout && is_trivial instead of the builtin. | |
523 | template<typename _Tp> | |
524 | struct is_pod | |
525 | : public integral_constant<bool, __is_pod(_Tp)> | |
526 | { }; | |
527 | ||
528 | /// is_literal_type | |
529 | template<typename _Tp> | |
530 | struct is_literal_type | |
531 | : public integral_constant<bool, __is_literal_type(_Tp)> | |
532 | { }; | |
533 | ||
53dc5044 PC |
534 | /// is_empty |
535 | template<typename _Tp> | |
536 | struct is_empty | |
537 | : public integral_constant<bool, __is_empty(_Tp)> | |
538 | { }; | |
539 | ||
540 | /// is_polymorphic | |
541 | template<typename _Tp> | |
542 | struct is_polymorphic | |
543 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
544 | { }; | |
545 | ||
546 | /// is_abstract | |
547 | template<typename _Tp> | |
548 | struct is_abstract | |
549 | : public integral_constant<bool, __is_abstract(_Tp)> | |
550 | { }; | |
551 | ||
123c516a PC |
552 | template<typename _Tp, |
553 | bool = is_integral<_Tp>::value, | |
554 | bool = is_floating_point<_Tp>::value> | |
555 | struct __is_signed_helper | |
556 | : public false_type { }; | |
557 | ||
53dc5044 | 558 | template<typename _Tp> |
123c516a PC |
559 | struct __is_signed_helper<_Tp, false, true> |
560 | : public true_type { }; | |
561 | ||
562 | template<typename _Tp> | |
563 | struct __is_signed_helper<_Tp, true, false> | |
564 | : public integral_constant<bool, static_cast<bool>(_Tp(-1) < _Tp(0))> | |
53dc5044 PC |
565 | { }; |
566 | ||
123c516a | 567 | /// is_signed |
53dc5044 | 568 | template<typename _Tp> |
123c516a PC |
569 | struct is_signed |
570 | : public integral_constant<bool, __is_signed_helper<_Tp>::value> | |
571 | { }; | |
572 | ||
573 | /// is_unsigned | |
574 | template<typename _Tp> | |
575 | struct is_unsigned | |
576 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type | |
577 | { }; | |
578 | ||
579 | ||
580 | // destructible and constructible type properties | |
581 | ||
53dc5044 | 582 | template<typename> |
123c516a | 583 | struct add_rvalue_reference; |
53dc5044 | 584 | |
13901e4b JW |
585 | /** |
586 | * @brief Utility to simplify expressions used in unevaluated operands | |
587 | * @ingroup utilities | |
588 | */ | |
53dc5044 | 589 | template<typename _Tp> |
123c516a | 590 | typename add_rvalue_reference<_Tp>::type declval() noexcept; |
53dc5044 | 591 | |
123c516a PC |
592 | template<typename, unsigned = 0> |
593 | struct extent; | |
594 | ||
595 | template<typename> | |
596 | struct remove_all_extents; | |
597 | ||
598 | template<typename _Tp> | |
599 | struct __is_array_known_bounds | |
600 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
601 | { }; |
602 | ||
123c516a PC |
603 | template<typename _Tp> |
604 | struct __is_array_unknown_bounds | |
605 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>::type | |
53dc5044 | 606 | { }; |
2c7a09d7 | 607 | |
62fa805f | 608 | // In N3290 is_destructible does not say anything about function |
2c7a09d7 | 609 | // types and abstract types, see LWG 2049. This implementation |
62fa805f DK |
610 | // describes function types as non-destructible and all complete |
611 | // object types as destructible, iff the explicit destructor | |
2c7a09d7 | 612 | // call expression is wellformed. |
62fa805f | 613 | struct __do_is_destructible_impl |
123c516a | 614 | { |
62fa805f | 615 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
123c516a PC |
616 | static true_type __test(int); |
617 | ||
618 | template<typename> | |
619 | static false_type __test(...); | |
620 | }; | |
53dc5044 PC |
621 | |
622 | template<typename _Tp> | |
62fa805f DK |
623 | struct __is_destructible_impl |
624 | : public __do_is_destructible_impl | |
123c516a PC |
625 | { |
626 | typedef decltype(__test<_Tp>(0)) type; | |
627 | }; | |
53dc5044 | 628 | |
62fa805f DK |
629 | template<typename _Tp, |
630 | bool = __or_<is_void<_Tp>, | |
631 | __is_array_unknown_bounds<_Tp>, | |
632 | is_function<_Tp>>::value, | |
633 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
634 | struct __is_destructible_safe; | |
635 | ||
636 | template<typename _Tp> | |
637 | struct __is_destructible_safe<_Tp, false, false> | |
638 | : public __is_destructible_impl<typename | |
639 | remove_all_extents<_Tp>::type>::type | |
640 | { }; | |
641 | ||
642 | template<typename _Tp> | |
643 | struct __is_destructible_safe<_Tp, true, false> | |
644 | : public false_type { }; | |
645 | ||
646 | template<typename _Tp> | |
647 | struct __is_destructible_safe<_Tp, false, true> | |
648 | : public true_type { }; | |
649 | ||
650 | /// is_destructible | |
651 | template<typename _Tp> | |
652 | struct is_destructible | |
653 | : public integral_constant<bool, (__is_destructible_safe<_Tp>::value)> | |
654 | { }; | |
655 | ||
656 | // is_nothrow_destructible requires that is_destructible is | |
657 | // satisfied as well. We realize that by mimicing the | |
658 | // implementation of is_destructible but refer to noexcept(expr) | |
659 | // instead of decltype(expr). | |
660 | struct __do_is_nt_destructible_impl | |
123c516a | 661 | { |
62fa805f DK |
662 | template<typename _Tp> |
663 | static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())> | |
664 | __test(int); | |
123c516a PC |
665 | |
666 | template<typename> | |
667 | static false_type __test(...); | |
668 | }; | |
53dc5044 | 669 | |
53dc5044 | 670 | template<typename _Tp> |
62fa805f DK |
671 | struct __is_nt_destructible_impl |
672 | : public __do_is_nt_destructible_impl | |
123c516a PC |
673 | { |
674 | typedef decltype(__test<_Tp>(0)) type; | |
675 | }; | |
676 | ||
677 | template<typename _Tp, | |
678 | bool = __or_<is_void<_Tp>, | |
62fa805f DK |
679 | __is_array_unknown_bounds<_Tp>, |
680 | is_function<_Tp>>::value, | |
681 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
682 | struct __is_nt_destructible_safe; | |
53dc5044 PC |
683 | |
684 | template<typename _Tp> | |
62fa805f DK |
685 | struct __is_nt_destructible_safe<_Tp, false, false> |
686 | : public __is_nt_destructible_impl<typename | |
687 | remove_all_extents<_Tp>::type>::type | |
123c516a PC |
688 | { }; |
689 | ||
53dc5044 | 690 | template<typename _Tp> |
62fa805f | 691 | struct __is_nt_destructible_safe<_Tp, true, false> |
123c516a | 692 | : public false_type { }; |
53dc5044 PC |
693 | |
694 | template<typename _Tp> | |
62fa805f | 695 | struct __is_nt_destructible_safe<_Tp, false, true> |
123c516a PC |
696 | : public true_type { }; |
697 | ||
62fa805f | 698 | /// is_nothrow_destructible |
53dc5044 | 699 | template<typename _Tp> |
62fa805f DK |
700 | struct is_nothrow_destructible |
701 | : public integral_constant<bool, (__is_nt_destructible_safe<_Tp>::value)> | |
123c516a PC |
702 | { }; |
703 | ||
704 | struct __do_is_default_constructible_impl | |
705 | { | |
706 | template<typename _Tp, typename = decltype(_Tp())> | |
707 | static true_type __test(int); | |
708 | ||
709 | template<typename> | |
710 | static false_type __test(...); | |
711 | }; | |
712 | ||
713 | template<typename _Tp> | |
714 | struct __is_default_constructible_impl | |
715 | : public __do_is_default_constructible_impl | |
53dc5044 | 716 | { |
123c516a | 717 | typedef decltype(__test<_Tp>(0)) type; |
53dc5044 | 718 | }; |
53dc5044 PC |
719 | |
720 | template<typename _Tp> | |
123c516a | 721 | struct __is_default_constructible_atom |
2c7a09d7 PC |
722 | : public __and_<__not_<is_void<_Tp>>, |
723 | __is_default_constructible_impl<_Tp>>::type | |
123c516a | 724 | { }; |
53dc5044 | 725 | |
123c516a PC |
726 | template<typename _Tp, bool = is_array<_Tp>::value> |
727 | struct __is_default_constructible_safe; | |
53dc5044 | 728 | |
2c7a09d7 PC |
729 | // The following technique is a workaround for a current core language |
730 | // restriction, which does not allow for array types to occur in | |
731 | // functional casts of the form T(). Complete arrays can be default- | |
732 | // constructed, if the element type is default-constructible, but | |
733 | // arrays with unknown bounds are not. | |
53dc5044 | 734 | template<typename _Tp> |
123c516a PC |
735 | struct __is_default_constructible_safe<_Tp, true> |
736 | : public __and_<__is_array_known_bounds<_Tp>, | |
737 | __is_default_constructible_atom<typename | |
2c7a09d7 | 738 | remove_all_extents<_Tp>::type>>::type |
53dc5044 PC |
739 | { }; |
740 | ||
53dc5044 | 741 | template<typename _Tp> |
123c516a PC |
742 | struct __is_default_constructible_safe<_Tp, false> |
743 | : public __is_default_constructible_atom<_Tp>::type | |
744 | { }; | |
4a27a739 | 745 | |
123c516a | 746 | /// is_default_constructible |
4a27a739 | 747 | template<typename _Tp> |
123c516a PC |
748 | struct is_default_constructible |
749 | : public integral_constant<bool, (__is_default_constructible_safe< | |
750 | _Tp>::value)> | |
751 | { }; | |
4a27a739 | 752 | |
2c7a09d7 PC |
753 | |
754 | // Implementation of is_constructible. | |
755 | ||
756 | // The hardest part of this trait is the binary direct-initialization | |
757 | // case, because we hit into a functional cast of the form T(arg). | |
758 | // This implementation uses different strategies depending on the | |
759 | // target type to reduce the test overhead as much as possible: | |
760 | // | |
761 | // a) For a reference target type, we use a static_cast expression | |
762 | // modulo its extra cases. | |
763 | // | |
764 | // b) For a non-reference target type we use a ::new expression. | |
123c516a PC |
765 | struct __do_is_static_castable_impl |
766 | { | |
767 | template<typename _From, typename _To, typename | |
768 | = decltype(static_cast<_To>(declval<_From>()))> | |
769 | static true_type __test(int); | |
4a27a739 | 770 | |
123c516a PC |
771 | template<typename, typename> |
772 | static false_type __test(...); | |
773 | }; | |
4a27a739 | 774 | |
123c516a PC |
775 | template<typename _From, typename _To> |
776 | struct __is_static_castable_impl | |
777 | : public __do_is_static_castable_impl | |
778 | { | |
779 | typedef decltype(__test<_From, _To>(0)) type; | |
780 | }; | |
939759fc | 781 | |
123c516a PC |
782 | template<typename _From, typename _To> |
783 | struct __is_static_castable_safe | |
2c7a09d7 | 784 | : public __is_static_castable_impl<_From, _To>::type |
4a27a739 PC |
785 | { }; |
786 | ||
123c516a PC |
787 | // __is_static_castable |
788 | template<typename _From, typename _To> | |
789 | struct __is_static_castable | |
790 | : public integral_constant<bool, (__is_static_castable_safe< | |
791 | _From, _To>::value)> | |
792 | { }; | |
939759fc | 793 | |
2c7a09d7 PC |
794 | // Implementation for non-reference types. To meet the proper |
795 | // variable definition semantics, we also need to test for | |
796 | // is_destructible in this case. | |
5db25ab1 DK |
797 | // This form should be simplified by a single expression: |
798 | // ::delete ::new _Tp(declval<_Arg>()), see c++/51222. | |
123c516a PC |
799 | struct __do_is_direct_constructible_impl |
800 | { | |
801 | template<typename _Tp, typename _Arg, typename | |
802 | = decltype(::new _Tp(declval<_Arg>()))> | |
803 | static true_type __test(int); | |
4a27a739 | 804 | |
123c516a PC |
805 | template<typename, typename> |
806 | static false_type __test(...); | |
807 | }; | |
4a27a739 | 808 | |
123c516a PC |
809 | template<typename _Tp, typename _Arg> |
810 | struct __is_direct_constructible_impl | |
811 | : public __do_is_direct_constructible_impl | |
812 | { | |
813 | typedef decltype(__test<_Tp, _Arg>(0)) type; | |
814 | }; | |
4a27a739 | 815 | |
123c516a PC |
816 | template<typename _Tp, typename _Arg> |
817 | struct __is_direct_constructible_new_safe | |
818 | : public __and_<is_destructible<_Tp>, | |
2c7a09d7 | 819 | __is_direct_constructible_impl<_Tp, _Arg>>::type |
123c516a | 820 | { }; |
4a27a739 | 821 | |
123c516a PC |
822 | template<typename, typename> |
823 | struct is_same; | |
4a27a739 | 824 | |
123c516a PC |
825 | template<typename, typename> |
826 | struct is_base_of; | |
4a27a739 | 827 | |
123c516a PC |
828 | template<typename> |
829 | struct remove_reference; | |
4a27a739 | 830 | |
123c516a | 831 | template<typename _From, typename _To, bool |
5db25ab1 DK |
832 | = __not_<__or_<is_void<_From>, |
833 | is_function<_From>>>::value> | |
123c516a | 834 | struct __is_base_to_derived_ref; |
4a27a739 | 835 | |
5db25ab1 DK |
836 | // Detect whether we have a downcast situation during |
837 | // reference binding. | |
123c516a PC |
838 | template<typename _From, typename _To> |
839 | struct __is_base_to_derived_ref<_From, _To, true> | |
840 | { | |
841 | typedef typename remove_cv<typename remove_reference<_From | |
842 | >::type>::type __src_t; | |
843 | typedef typename remove_cv<typename remove_reference<_To | |
844 | >::type>::type __dst_t; | |
2c7a09d7 PC |
845 | typedef __and_<__not_<is_same<__src_t, __dst_t>>, |
846 | is_base_of<__src_t, __dst_t>> type; | |
123c516a PC |
847 | static constexpr bool value = type::value; |
848 | }; | |
4a27a739 | 849 | |
123c516a PC |
850 | template<typename _From, typename _To> |
851 | struct __is_base_to_derived_ref<_From, _To, false> | |
852 | : public false_type | |
4a27a739 PC |
853 | { }; |
854 | ||
123c516a PC |
855 | template<typename _From, typename _To, bool |
856 | = __and_<is_lvalue_reference<_From>, | |
857 | is_rvalue_reference<_To>>::value> | |
858 | struct __is_lvalue_to_rvalue_ref; | |
e133ace8 | 859 | |
5db25ab1 DK |
860 | // Detect whether we have an lvalue of non-function type |
861 | // bound to a reference-compatible rvalue-reference. | |
123c516a PC |
862 | template<typename _From, typename _To> |
863 | struct __is_lvalue_to_rvalue_ref<_From, _To, true> | |
864 | { | |
865 | typedef typename remove_cv<typename remove_reference< | |
866 | _From>::type>::type __src_t; | |
867 | typedef typename remove_cv<typename remove_reference< | |
868 | _To>::type>::type __dst_t; | |
5db25ab1 DK |
869 | typedef __and_<__not_<is_function<__src_t>>, |
870 | __or_<is_same<__src_t, __dst_t>, | |
871 | is_base_of<__dst_t, __src_t>>> type; | |
123c516a PC |
872 | static constexpr bool value = type::value; |
873 | }; | |
e133ace8 | 874 | |
123c516a PC |
875 | template<typename _From, typename _To> |
876 | struct __is_lvalue_to_rvalue_ref<_From, _To, false> | |
877 | : public false_type | |
e133ace8 PC |
878 | { }; |
879 | ||
2c7a09d7 PC |
880 | // Here we handle direct-initialization to a reference type as |
881 | // equivalent to a static_cast modulo overshooting conversions. | |
882 | // These are restricted to the following conversions: | |
5db25ab1 | 883 | // a) A base class value to a derived class reference |
2c7a09d7 | 884 | // b) An lvalue to an rvalue-reference of reference-compatible |
5db25ab1 | 885 | // types that are not functions |
123c516a PC |
886 | template<typename _Tp, typename _Arg> |
887 | struct __is_direct_constructible_ref_cast | |
888 | : public __and_<__is_static_castable<_Arg, _Tp>, | |
889 | __not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>, | |
890 | __is_lvalue_to_rvalue_ref<_Arg, _Tp> | |
2c7a09d7 | 891 | >>>::type |
e133ace8 PC |
892 | { }; |
893 | ||
123c516a PC |
894 | template<typename _Tp, typename _Arg> |
895 | struct __is_direct_constructible_new | |
896 | : public conditional<is_reference<_Tp>::value, | |
897 | __is_direct_constructible_ref_cast<_Tp, _Arg>, | |
898 | __is_direct_constructible_new_safe<_Tp, _Arg> | |
899 | >::type | |
b0302c68 PC |
900 | { }; |
901 | ||
123c516a PC |
902 | template<typename _Tp, typename _Arg> |
903 | struct __is_direct_constructible | |
904 | : public integral_constant<bool, (__is_direct_constructible_new< | |
2c7a09d7 | 905 | _Tp, _Arg>::value)> |
e133ace8 PC |
906 | { }; |
907 | ||
2c7a09d7 PC |
908 | // Since default-construction and binary direct-initialization have |
909 | // been handled separately, the implementation of the remaining | |
5db25ab1 DK |
910 | // n-ary construction cases is rather straightforward. We can use |
911 | // here a functional cast, because array types are excluded anyway | |
912 | // and this form is never interpreted as a C cast. | |
123c516a PC |
913 | struct __do_is_nary_constructible_impl |
914 | { | |
915 | template<typename _Tp, typename... _Args, typename | |
916 | = decltype(_Tp(declval<_Args>()...))> | |
917 | static true_type __test(int); | |
2b08f2c5 | 918 | |
123c516a PC |
919 | template<typename, typename...> |
920 | static false_type __test(...); | |
921 | }; | |
b0302c68 PC |
922 | |
923 | template<typename _Tp, typename... _Args> | |
123c516a PC |
924 | struct __is_nary_constructible_impl |
925 | : public __do_is_nary_constructible_impl | |
b0302c68 | 926 | { |
123c516a | 927 | typedef decltype(__test<_Tp, _Args...>(0)) type; |
b0302c68 PC |
928 | }; |
929 | ||
123c516a PC |
930 | template<typename _Tp, typename... _Args> |
931 | struct __is_nary_constructible | |
2c7a09d7 | 932 | : public __is_nary_constructible_impl<_Tp, _Args...>::type |
b0302c68 | 933 | { |
123c516a PC |
934 | static_assert(sizeof...(_Args) > 1, |
935 | "Only useful for > 1 arguments"); | |
936 | }; | |
b0302c68 | 937 | |
123c516a PC |
938 | template<typename _Tp, typename... _Args> |
939 | struct __is_constructible_impl | |
940 | : public __is_nary_constructible<_Tp, _Args...> | |
941 | { }; | |
b0302c68 | 942 | |
123c516a PC |
943 | template<typename _Tp, typename _Arg> |
944 | struct __is_constructible_impl<_Tp, _Arg> | |
945 | : public __is_direct_constructible<_Tp, _Arg> | |
946 | { }; | |
947 | ||
948 | template<typename _Tp> | |
949 | struct __is_constructible_impl<_Tp> | |
950 | : public is_default_constructible<_Tp> | |
951 | { }; | |
b0302c68 PC |
952 | |
953 | /// is_constructible | |
b0302c68 PC |
954 | template<typename _Tp, typename... _Args> |
955 | struct is_constructible | |
123c516a PC |
956 | : public integral_constant<bool, (__is_constructible_impl<_Tp, |
957 | _Args...>::value)> | |
c32097d8 JM |
958 | { }; |
959 | ||
65cee9bd PC |
960 | template<typename _Tp, bool = is_void<_Tp>::value> |
961 | struct __is_copy_constructible_impl; | |
123c516a | 962 | |
65cee9bd PC |
963 | template<typename _Tp> |
964 | struct __is_copy_constructible_impl<_Tp, true> | |
965 | : public false_type { }; | |
966 | ||
967 | template<typename _Tp> | |
968 | struct __is_copy_constructible_impl<_Tp, false> | |
969 | : public is_constructible<_Tp, const _Tp&> | |
970 | { }; | |
971 | ||
972 | /// is_copy_constructible | |
973 | template<typename _Tp> | |
974 | struct is_copy_constructible | |
975 | : public __is_copy_constructible_impl<_Tp> | |
976 | { }; | |
977 | ||
978 | template<typename _Tp, bool = is_void<_Tp>::value> | |
979 | struct __is_move_constructible_impl; | |
980 | ||
981 | template<typename _Tp> | |
982 | struct __is_move_constructible_impl<_Tp, true> | |
983 | : public false_type { }; | |
984 | ||
985 | template<typename _Tp> | |
986 | struct __is_move_constructible_impl<_Tp, false> | |
987 | : public is_constructible<_Tp, _Tp&&> | |
988 | { }; | |
989 | ||
990 | /// is_move_constructible | |
991 | template<typename _Tp> | |
992 | struct is_move_constructible | |
993 | : public __is_move_constructible_impl<_Tp> | |
994 | { }; | |
995 | ||
996 | template<typename _Tp> | |
997 | struct __is_nt_default_constructible_atom | |
998 | : public integral_constant<bool, noexcept(_Tp())> | |
999 | { }; | |
1000 | ||
1001 | template<typename _Tp, bool = is_array<_Tp>::value> | |
1002 | struct __is_nt_default_constructible_impl; | |
1003 | ||
1004 | template<typename _Tp> | |
1005 | struct __is_nt_default_constructible_impl<_Tp, true> | |
1006 | : public __and_<__is_array_known_bounds<_Tp>, | |
1007 | __is_nt_default_constructible_atom<typename | |
1008 | remove_all_extents<_Tp>::type>>::type | |
1009 | { }; | |
1010 | ||
1011 | template<typename _Tp> | |
1012 | struct __is_nt_default_constructible_impl<_Tp, false> | |
1013 | : public __is_nt_default_constructible_atom<_Tp> | |
1014 | { }; | |
1015 | ||
1016 | /// is_nothrow_default_constructible | |
1017 | template<typename _Tp> | |
1018 | struct is_nothrow_default_constructible | |
1019 | : public __and_<is_default_constructible<_Tp>, | |
1020 | __is_nt_default_constructible_impl<_Tp>>::type | |
1021 | { }; | |
e4f32cb0 PC |
1022 | |
1023 | template<typename _Tp, typename... _Args> | |
65cee9bd PC |
1024 | struct __is_nt_constructible_impl |
1025 | : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> | |
1026 | { }; | |
e4f32cb0 PC |
1027 | |
1028 | template<typename _Tp, typename _Arg> | |
65cee9bd PC |
1029 | struct __is_nt_constructible_impl<_Tp, _Arg> |
1030 | : public integral_constant<bool, | |
1031 | noexcept(static_cast<_Tp>(declval<_Arg>()))> | |
1032 | { }; | |
1033 | ||
1034 | template<typename _Tp> | |
1035 | struct __is_nt_constructible_impl<_Tp> | |
1036 | : public is_nothrow_default_constructible<_Tp> | |
1037 | { }; | |
e4f32cb0 PC |
1038 | |
1039 | /// is_nothrow_constructible | |
1040 | template<typename _Tp, typename... _Args> | |
1041 | struct is_nothrow_constructible | |
65cee9bd PC |
1042 | : public __and_<is_constructible<_Tp, _Args...>, |
1043 | __is_nt_constructible_impl<_Tp, _Args...>>::type | |
1044 | { }; | |
1045 | ||
1046 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1047 | struct __is_nothrow_copy_constructible_impl; | |
1048 | ||
1049 | template<typename _Tp> | |
1050 | struct __is_nothrow_copy_constructible_impl<_Tp, true> | |
1051 | : public false_type { }; | |
1052 | ||
1053 | template<typename _Tp> | |
1054 | struct __is_nothrow_copy_constructible_impl<_Tp, false> | |
1055 | : public is_nothrow_constructible<_Tp, const _Tp&> | |
1056 | { }; | |
1057 | ||
1058 | /// is_nothrow_copy_constructible | |
1059 | template<typename _Tp> | |
1060 | struct is_nothrow_copy_constructible | |
1061 | : public __is_nothrow_copy_constructible_impl<_Tp> | |
1062 | { }; | |
1063 | ||
1064 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1065 | struct __is_nothrow_move_constructible_impl; | |
1066 | ||
1067 | template<typename _Tp> | |
1068 | struct __is_nothrow_move_constructible_impl<_Tp, true> | |
1069 | : public false_type { }; | |
1070 | ||
1071 | template<typename _Tp> | |
1072 | struct __is_nothrow_move_constructible_impl<_Tp, false> | |
1073 | : public is_nothrow_constructible<_Tp, _Tp&&> | |
1074 | { }; | |
1075 | ||
1076 | /// is_nothrow_move_constructible | |
1077 | template<typename _Tp> | |
1078 | struct is_nothrow_move_constructible | |
1079 | : public __is_nothrow_move_constructible_impl<_Tp> | |
1080 | { }; | |
1081 | ||
f263981a PC |
1082 | template<typename _Tp, typename _Up> |
1083 | class __is_assignable_helper | |
1084 | : public __sfinae_types | |
1085 | { | |
1086 | template<typename _Tp1, typename _Up1> | |
1087 | static decltype(declval<_Tp1>() = declval<_Up1>(), __one()) | |
1088 | __test(int); | |
1089 | ||
1090 | template<typename, typename> | |
1091 | static __two __test(...); | |
1092 | ||
1093 | public: | |
1094 | static constexpr bool value = sizeof(__test<_Tp, _Up>(0)) == 1; | |
1095 | }; | |
1096 | ||
1097 | /// is_assignable | |
1098 | template<typename _Tp, typename _Up> | |
1099 | struct is_assignable | |
1100 | : public integral_constant<bool, | |
1101 | __is_assignable_helper<_Tp, _Up>::value> | |
1102 | { }; | |
1103 | ||
1104 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1105 | struct __is_copy_assignable_impl; | |
1106 | ||
1107 | template<typename _Tp> | |
1108 | struct __is_copy_assignable_impl<_Tp, true> | |
1109 | : public false_type { }; | |
1110 | ||
1111 | template<typename _Tp> | |
1112 | struct __is_copy_assignable_impl<_Tp, false> | |
9b3a81da | 1113 | : public is_assignable<_Tp&, const _Tp&> |
f263981a PC |
1114 | { }; |
1115 | ||
1116 | /// is_copy_assignable | |
1117 | template<typename _Tp> | |
1118 | struct is_copy_assignable | |
1119 | : public __is_copy_assignable_impl<_Tp> | |
1120 | { }; | |
1121 | ||
1122 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1123 | struct __is_move_assignable_impl; | |
1124 | ||
1125 | template<typename _Tp> | |
1126 | struct __is_move_assignable_impl<_Tp, true> | |
1127 | : public false_type { }; | |
1128 | ||
1129 | template<typename _Tp> | |
1130 | struct __is_move_assignable_impl<_Tp, false> | |
1131 | : public is_assignable<_Tp&, _Tp&&> | |
1132 | { }; | |
1133 | ||
1134 | /// is_move_assignable | |
1135 | template<typename _Tp> | |
1136 | struct is_move_assignable | |
1137 | : public __is_move_assignable_impl<_Tp> | |
1138 | { }; | |
1139 | ||
1140 | template<typename _Tp, typename _Up> | |
1141 | struct __is_nt_assignable_impl | |
1142 | : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())> | |
1143 | { }; | |
1144 | ||
1145 | /// is_nothrow_assignable | |
1146 | template<typename _Tp, typename _Up> | |
1147 | struct is_nothrow_assignable | |
1148 | : public __and_<is_assignable<_Tp, _Up>, | |
1149 | __is_nt_assignable_impl<_Tp, _Up>>::type | |
1150 | { }; | |
1151 | ||
1152 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1153 | struct __is_nt_copy_assignable_impl; | |
1154 | ||
1155 | template<typename _Tp> | |
1156 | struct __is_nt_copy_assignable_impl<_Tp, true> | |
1157 | : public false_type { }; | |
1158 | ||
1159 | template<typename _Tp> | |
1160 | struct __is_nt_copy_assignable_impl<_Tp, false> | |
9b3a81da | 1161 | : public is_nothrow_assignable<_Tp&, const _Tp&> |
f263981a PC |
1162 | { }; |
1163 | ||
1164 | /// is_nothrow_copy_assignable | |
1165 | template<typename _Tp> | |
1166 | struct is_nothrow_copy_assignable | |
1167 | : public __is_nt_copy_assignable_impl<_Tp> | |
1168 | { }; | |
1169 | ||
1170 | template<typename _Tp, bool = is_void<_Tp>::value> | |
1171 | struct __is_nt_move_assignable_impl; | |
1172 | ||
1173 | template<typename _Tp> | |
1174 | struct __is_nt_move_assignable_impl<_Tp, true> | |
1175 | : public false_type { }; | |
1176 | ||
1177 | template<typename _Tp> | |
1178 | struct __is_nt_move_assignable_impl<_Tp, false> | |
1179 | : public is_nothrow_assignable<_Tp&, _Tp&&> | |
1180 | { }; | |
1181 | ||
1182 | /// is_nothrow_move_assignable | |
65cee9bd | 1183 | template<typename _Tp> |
f263981a PC |
1184 | struct is_nothrow_move_assignable |
1185 | : public __is_nt_move_assignable_impl<_Tp> | |
e4f32cb0 PC |
1186 | { }; |
1187 | ||
6a9ecd34 PC |
1188 | /// is_trivially_constructible (still unimplemented) |
1189 | ||
1190 | /// is_trivially_default_constructible (still unimplemented) | |
1191 | ||
1192 | /// is_trivially_copy_constructible (still unimplemented) | |
1193 | ||
1194 | /// is_trivially_move_constructible (still unimplemented) | |
1195 | ||
1196 | /// is_trivially_assignable (still unimplemented) | |
1197 | ||
1198 | /// is_trivially_copy_assignable (still unimplemented) | |
1199 | ||
1200 | /// is_trivially_move_assignable (still unimplemented) | |
1201 | ||
1202 | /// is_trivially_destructible | |
1203 | template<typename _Tp> | |
1204 | struct is_trivially_destructible | |
1205 | : public __and_<is_destructible<_Tp>, integral_constant<bool, | |
1206 | __has_trivial_destructor(_Tp)>>::type | |
1207 | { }; | |
1208 | ||
1209 | /// has_trivial_default_constructor (temporary legacy) | |
e133ace8 PC |
1210 | template<typename _Tp> |
1211 | struct has_trivial_default_constructor | |
1212 | : public integral_constant<bool, __has_trivial_constructor(_Tp)> | |
1213 | { }; | |
1214 | ||
6a9ecd34 | 1215 | /// has_trivial_copy_constructor (temporary legacy) |
e133ace8 PC |
1216 | template<typename _Tp> |
1217 | struct has_trivial_copy_constructor | |
1218 | : public integral_constant<bool, __has_trivial_copy(_Tp)> | |
1219 | { }; | |
1220 | ||
6a9ecd34 | 1221 | /// has_trivial_copy_assign (temporary legacy) |
e133ace8 | 1222 | template<typename _Tp> |
6f5e9b8d | 1223 | struct has_trivial_copy_assign |
e133ace8 PC |
1224 | : public integral_constant<bool, __has_trivial_assign(_Tp)> |
1225 | { }; | |
1226 | ||
123c516a PC |
1227 | /// has_virtual_destructor |
1228 | template<typename _Tp> | |
1229 | struct has_virtual_destructor | |
1230 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
1231 | { }; | |
1232 | ||
1233 | ||
1234 | // type property queries. | |
1235 | ||
1236 | /// alignment_of | |
1237 | template<typename _Tp> | |
1238 | struct alignment_of | |
1239 | : public integral_constant<std::size_t, __alignof__(_Tp)> { }; | |
1240 | ||
1241 | /// rank | |
1242 | template<typename> | |
1243 | struct rank | |
1244 | : public integral_constant<std::size_t, 0> { }; | |
1245 | ||
1246 | template<typename _Tp, std::size_t _Size> | |
1247 | struct rank<_Tp[_Size]> | |
1248 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1249 | ||
1250 | template<typename _Tp> | |
1251 | struct rank<_Tp[]> | |
1252 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1253 | ||
1254 | /// extent | |
1255 | template<typename, unsigned _Uint> | |
1256 | struct extent | |
1257 | : public integral_constant<std::size_t, 0> { }; | |
1258 | ||
1259 | template<typename _Tp, unsigned _Uint, std::size_t _Size> | |
1260 | struct extent<_Tp[_Size], _Uint> | |
1261 | : public integral_constant<std::size_t, | |
1262 | _Uint == 0 ? _Size : extent<_Tp, | |
1263 | _Uint - 1>::value> | |
1264 | { }; | |
1265 | ||
1266 | template<typename _Tp, unsigned _Uint> | |
1267 | struct extent<_Tp[], _Uint> | |
1268 | : public integral_constant<std::size_t, | |
1269 | _Uint == 0 ? 0 : extent<_Tp, | |
1270 | _Uint - 1>::value> | |
1271 | { }; | |
1272 | ||
1273 | ||
1274 | // type relations. | |
1275 | ||
1276 | /// is_same | |
1277 | template<typename, typename> | |
1278 | struct is_same | |
1279 | : public false_type { }; | |
1280 | ||
1281 | template<typename _Tp> | |
1282 | struct is_same<_Tp, _Tp> | |
1283 | : public true_type { }; | |
b0302c68 | 1284 | |
939759fc | 1285 | /// is_base_of |
e133ace8 PC |
1286 | template<typename _Base, typename _Derived> |
1287 | struct is_base_of | |
1288 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
1289 | { }; | |
1290 | ||
297f34d7 | 1291 | template<typename _From, typename _To, |
123c516a PC |
1292 | bool = __or_<is_void<_From>, is_function<_To>, |
1293 | is_array<_To>>::value> | |
297f34d7 | 1294 | struct __is_convertible_helper |
f263981a | 1295 | { static constexpr bool value = is_void<_To>::value; }; |
297f34d7 | 1296 | |
e133ace8 | 1297 | template<typename _From, typename _To> |
b0302c68 | 1298 | class __is_convertible_helper<_From, _To, false> |
e133ace8 PC |
1299 | : public __sfinae_types |
1300 | { | |
8e7d962a PC |
1301 | template<typename _To1> |
1302 | static void __test_aux(_To1); | |
1303 | ||
1304 | template<typename _From1, typename _To1> | |
1305 | static decltype(__test_aux<_To1>(std::declval<_From1>()), __one()) | |
1306 | __test(int); | |
1307 | ||
1308 | template<typename, typename> | |
1309 | static __two __test(...); | |
297f34d7 | 1310 | |
e133ace8 | 1311 | public: |
f263981a | 1312 | static constexpr bool value = sizeof(__test<_From, _To>(0)) == 1; |
e133ace8 PC |
1313 | }; |
1314 | ||
b0302c68 | 1315 | /// is_convertible |
e133ace8 PC |
1316 | template<typename _From, typename _To> |
1317 | struct is_convertible | |
1318 | : public integral_constant<bool, | |
f263981a | 1319 | __is_convertible_helper<_From, _To>::value> |
e133ace8 PC |
1320 | { }; |
1321 | ||
fd735b6a | 1322 | |
123c516a | 1323 | // const-volatile modifications. |
7b50cdef | 1324 | |
123c516a | 1325 | /// remove_const |
7b50cdef | 1326 | template<typename _Tp> |
123c516a PC |
1327 | struct remove_const |
1328 | { typedef _Tp type; }; | |
7b50cdef | 1329 | |
123c516a PC |
1330 | template<typename _Tp> |
1331 | struct remove_const<_Tp const> | |
1332 | { typedef _Tp type; }; | |
1333 | ||
1334 | /// remove_volatile | |
1335 | template<typename _Tp> | |
1336 | struct remove_volatile | |
1337 | { typedef _Tp type; }; | |
7b50cdef | 1338 | |
123c516a PC |
1339 | template<typename _Tp> |
1340 | struct remove_volatile<_Tp volatile> | |
1341 | { typedef _Tp type; }; | |
1342 | ||
1343 | /// remove_cv | |
1344 | template<typename _Tp> | |
1345 | struct remove_cv | |
1346 | { | |
1347 | typedef typename | |
1348 | remove_const<typename remove_volatile<_Tp>::type>::type type; | |
1349 | }; | |
1350 | ||
1351 | /// add_const | |
1352 | template<typename _Tp> | |
1353 | struct add_const | |
1354 | { typedef _Tp const type; }; | |
1355 | ||
1356 | /// add_volatile | |
1357 | template<typename _Tp> | |
1358 | struct add_volatile | |
1359 | { typedef _Tp volatile type; }; | |
1360 | ||
1361 | /// add_cv | |
1362 | template<typename _Tp> | |
1363 | struct add_cv | |
1364 | { | |
1365 | typedef typename | |
1366 | add_const<typename add_volatile<_Tp>::type>::type type; | |
1367 | }; | |
7b50cdef | 1368 | |
7b50cdef | 1369 | |
123c516a | 1370 | // Reference transformations. |
7b50cdef | 1371 | |
123c516a PC |
1372 | /// remove_reference |
1373 | template<typename _Tp> | |
1374 | struct remove_reference | |
1375 | { typedef _Tp type; }; | |
7b50cdef | 1376 | |
123c516a PC |
1377 | template<typename _Tp> |
1378 | struct remove_reference<_Tp&> | |
1379 | { typedef _Tp type; }; | |
7b50cdef | 1380 | |
123c516a PC |
1381 | template<typename _Tp> |
1382 | struct remove_reference<_Tp&&> | |
1383 | { typedef _Tp type; }; | |
1384 | ||
1385 | template<typename _Tp, | |
1386 | bool = __and_<__not_<is_reference<_Tp>>, | |
1387 | __not_<is_void<_Tp>>>::value, | |
1388 | bool = is_rvalue_reference<_Tp>::value> | |
1389 | struct __add_lvalue_reference_helper | |
1390 | { typedef _Tp type; }; | |
7b50cdef | 1391 | |
5e108459 | 1392 | template<typename _Tp> |
123c516a PC |
1393 | struct __add_lvalue_reference_helper<_Tp, true, false> |
1394 | { typedef _Tp& type; }; | |
5e108459 | 1395 | |
5e108459 | 1396 | template<typename _Tp> |
123c516a PC |
1397 | struct __add_lvalue_reference_helper<_Tp, false, true> |
1398 | { typedef typename remove_reference<_Tp>::type& type; }; | |
5e108459 | 1399 | |
123c516a | 1400 | /// add_lvalue_reference |
5e108459 | 1401 | template<typename _Tp> |
123c516a PC |
1402 | struct add_lvalue_reference |
1403 | : public __add_lvalue_reference_helper<_Tp> | |
1404 | { }; | |
1405 | ||
1406 | template<typename _Tp, | |
1407 | bool = __and_<__not_<is_reference<_Tp>>, | |
1408 | __not_<is_void<_Tp>>>::value> | |
1409 | struct __add_rvalue_reference_helper | |
1410 | { typedef _Tp type; }; | |
5e108459 PC |
1411 | |
1412 | template<typename _Tp> | |
123c516a PC |
1413 | struct __add_rvalue_reference_helper<_Tp, true> |
1414 | { typedef _Tp&& type; }; | |
5e108459 | 1415 | |
123c516a | 1416 | /// add_rvalue_reference |
5e108459 | 1417 | template<typename _Tp> |
123c516a PC |
1418 | struct add_rvalue_reference |
1419 | : public __add_rvalue_reference_helper<_Tp> | |
1420 | { }; | |
5e108459 | 1421 | |
7b50cdef | 1422 | |
123c516a PC |
1423 | // sign modifications. |
1424 | ||
7b50cdef BK |
1425 | // Utility for constructing identically cv-qualified types. |
1426 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1427 | struct __cv_selector; | |
1428 | ||
1429 | template<typename _Unqualified> | |
1430 | struct __cv_selector<_Unqualified, false, false> | |
1431 | { typedef _Unqualified __type; }; | |
1432 | ||
1433 | template<typename _Unqualified> | |
1434 | struct __cv_selector<_Unqualified, false, true> | |
1435 | { typedef volatile _Unqualified __type; }; | |
1436 | ||
1437 | template<typename _Unqualified> | |
1438 | struct __cv_selector<_Unqualified, true, false> | |
1439 | { typedef const _Unqualified __type; }; | |
1440 | ||
1441 | template<typename _Unqualified> | |
1442 | struct __cv_selector<_Unqualified, true, true> | |
1443 | { typedef const volatile _Unqualified __type; }; | |
1444 | ||
1445 | template<typename _Qualified, typename _Unqualified, | |
1446 | bool _IsConst = is_const<_Qualified>::value, | |
1447 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1448 | class __match_cv_qualifiers |
7b50cdef | 1449 | { |
7b50cdef BK |
1450 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1451 | ||
1452 | public: | |
1453 | typedef typename __match::__type __type; | |
1454 | }; | |
1455 | ||
7b50cdef BK |
1456 | // Utility for finding the unsigned versions of signed integral types. |
1457 | template<typename _Tp> | |
e133ace8 PC |
1458 | struct __make_unsigned |
1459 | { typedef _Tp __type; }; | |
7b50cdef BK |
1460 | |
1461 | template<> | |
1462 | struct __make_unsigned<char> | |
1463 | { typedef unsigned char __type; }; | |
1464 | ||
1465 | template<> | |
1466 | struct __make_unsigned<signed char> | |
1467 | { typedef unsigned char __type; }; | |
1468 | ||
7b50cdef BK |
1469 | template<> |
1470 | struct __make_unsigned<short> | |
1471 | { typedef unsigned short __type; }; | |
1472 | ||
1473 | template<> | |
1474 | struct __make_unsigned<int> | |
1475 | { typedef unsigned int __type; }; | |
1476 | ||
1477 | template<> | |
1478 | struct __make_unsigned<long> | |
1479 | { typedef unsigned long __type; }; | |
1480 | ||
1481 | template<> | |
1482 | struct __make_unsigned<long long> | |
1483 | { typedef unsigned long long __type; }; | |
1484 | ||
6d585f01 PC |
1485 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128) |
1486 | template<> | |
fd1e62c2 PC |
1487 | struct __make_unsigned<__int128> |
1488 | { typedef unsigned __int128 __type; }; | |
6d585f01 PC |
1489 | #endif |
1490 | ||
7b50cdef BK |
1491 | // Select between integral and enum: not possible to be both. |
1492 | template<typename _Tp, | |
1493 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1494 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1495 | class __make_unsigned_selector; |
1496 | ||
7b50cdef | 1497 | template<typename _Tp> |
b0302c68 | 1498 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1499 | { |
7b50cdef BK |
1500 | typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt; |
1501 | typedef typename __unsignedt::__type __unsigned_type; | |
1502 | typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned; | |
1503 | ||
1504 | public: | |
1505 | typedef typename __cv_unsigned::__type __type; | |
1506 | }; | |
1507 | ||
7b50cdef | 1508 | template<typename _Tp> |
b0302c68 | 1509 | class __make_unsigned_selector<_Tp, false, true> |
7b50cdef | 1510 | { |
a0230468 MM |
1511 | // With -fshort-enums, an enum may be as small as a char. |
1512 | typedef unsigned char __smallest; | |
1513 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1514 | static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short); | |
ce2e6349 | 1515 | static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int); |
a0230468 MM |
1516 | typedef conditional<__b2, unsigned int, unsigned long> __cond2; |
1517 | typedef typename __cond2::type __cond2_type; | |
1518 | typedef conditional<__b1, unsigned short, __cond2_type> __cond1; | |
1519 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1520 | |
1521 | public: | |
a0230468 | 1522 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1523 | }; |
1524 | ||
7b50cdef BK |
1525 | // Given an integral/enum type, return the corresponding unsigned |
1526 | // integer type. | |
5b9daa7e BK |
1527 | // Primary template. |
1528 | /// make_unsigned | |
7b50cdef BK |
1529 | template<typename _Tp> |
1530 | struct make_unsigned | |
1531 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; | |
1532 | ||
1533 | // Integral, but don't define. | |
1534 | template<> | |
1535 | struct make_unsigned<bool>; | |
1536 | ||
1537 | ||
1538 | // Utility for finding the signed versions of unsigned integral types. | |
1539 | template<typename _Tp> | |
e133ace8 PC |
1540 | struct __make_signed |
1541 | { typedef _Tp __type; }; | |
7b50cdef BK |
1542 | |
1543 | template<> | |
1544 | struct __make_signed<char> | |
1545 | { typedef signed char __type; }; | |
1546 | ||
1547 | template<> | |
1548 | struct __make_signed<unsigned char> | |
1549 | { typedef signed char __type; }; | |
1550 | ||
7b50cdef BK |
1551 | template<> |
1552 | struct __make_signed<unsigned short> | |
1553 | { typedef signed short __type; }; | |
1554 | ||
1555 | template<> | |
1556 | struct __make_signed<unsigned int> | |
1557 | { typedef signed int __type; }; | |
1558 | ||
1559 | template<> | |
1560 | struct __make_signed<unsigned long> | |
1561 | { typedef signed long __type; }; | |
1562 | ||
1563 | template<> | |
1564 | struct __make_signed<unsigned long long> | |
1565 | { typedef signed long long __type; }; | |
1566 | ||
6d585f01 PC |
1567 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128) |
1568 | template<> | |
fd1e62c2 PC |
1569 | struct __make_signed<unsigned __int128> |
1570 | { typedef __int128 __type; }; | |
6d585f01 PC |
1571 | #endif |
1572 | ||
fb8ffd10 | 1573 | // Select between integral and enum: not possible to be both. |
7b50cdef BK |
1574 | template<typename _Tp, |
1575 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1576 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1577 | class __make_signed_selector; |
1578 | ||
7b50cdef | 1579 | template<typename _Tp> |
b0302c68 | 1580 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1581 | { |
7b50cdef BK |
1582 | typedef __make_signed<typename remove_cv<_Tp>::type> __signedt; |
1583 | typedef typename __signedt::__type __signed_type; | |
1584 | typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed; | |
1585 | ||
1586 | public: | |
1587 | typedef typename __cv_signed::__type __type; | |
1588 | }; | |
1589 | ||
7b50cdef | 1590 | template<typename _Tp> |
b0302c68 | 1591 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1592 | { |
a0230468 MM |
1593 | // With -fshort-enums, an enum may be as small as a char. |
1594 | typedef signed char __smallest; | |
1595 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1596 | static const bool __b1 = sizeof(_Tp) <= sizeof(signed short); | |
ce2e6349 | 1597 | static const bool __b2 = sizeof(_Tp) <= sizeof(signed int); |
a0230468 MM |
1598 | typedef conditional<__b2, signed int, signed long> __cond2; |
1599 | typedef typename __cond2::type __cond2_type; | |
1600 | typedef conditional<__b1, signed short, __cond2_type> __cond1; | |
1601 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1602 | |
1603 | public: | |
a0230468 | 1604 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1605 | }; |
1606 | ||
7b50cdef BK |
1607 | // Given an integral/enum type, return the corresponding signed |
1608 | // integer type. | |
5b9daa7e BK |
1609 | // Primary template. |
1610 | /// make_signed | |
7b50cdef BK |
1611 | template<typename _Tp> |
1612 | struct make_signed | |
1613 | { typedef typename __make_signed_selector<_Tp>::__type type; }; | |
1614 | ||
1615 | // Integral, but don't define. | |
1616 | template<> | |
1617 | struct make_signed<bool>; | |
cfa9a96b | 1618 | |
123c516a PC |
1619 | |
1620 | // array modifications. | |
1621 | ||
1622 | /// remove_extent | |
1623 | template<typename _Tp> | |
1624 | struct remove_extent | |
1625 | { typedef _Tp type; }; | |
1626 | ||
1627 | template<typename _Tp, std::size_t _Size> | |
1628 | struct remove_extent<_Tp[_Size]> | |
1629 | { typedef _Tp type; }; | |
1630 | ||
1631 | template<typename _Tp> | |
1632 | struct remove_extent<_Tp[]> | |
1633 | { typedef _Tp type; }; | |
1634 | ||
1635 | /// remove_all_extents | |
1636 | template<typename _Tp> | |
1637 | struct remove_all_extents | |
1638 | { typedef _Tp type; }; | |
1639 | ||
1640 | template<typename _Tp, std::size_t _Size> | |
1641 | struct remove_all_extents<_Tp[_Size]> | |
1642 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1643 | ||
1644 | template<typename _Tp> | |
1645 | struct remove_all_extents<_Tp[]> | |
1646 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1647 | ||
1648 | ||
1649 | // pointer modifications. | |
1650 | ||
1651 | template<typename _Tp, typename> | |
1652 | struct __remove_pointer_helper | |
1653 | { typedef _Tp type; }; | |
1654 | ||
1655 | template<typename _Tp, typename _Up> | |
1656 | struct __remove_pointer_helper<_Tp, _Up*> | |
1657 | { typedef _Up type; }; | |
1658 | ||
1659 | /// remove_pointer | |
1660 | template<typename _Tp> | |
1661 | struct remove_pointer | |
1662 | : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> | |
1663 | { }; | |
1664 | ||
1665 | /// add_pointer | |
1666 | template<typename _Tp> | |
1667 | struct add_pointer | |
1668 | { typedef typename remove_reference<_Tp>::type* type; }; | |
1669 | ||
1670 | ||
1671 | template<std::size_t _Len> | |
1672 | struct __aligned_storage_msa | |
1673 | { | |
1674 | union __type | |
1675 | { | |
1676 | unsigned char __data[_Len]; | |
1677 | struct __attribute__((__aligned__)) { } __align; | |
1678 | }; | |
1679 | }; | |
1680 | ||
1681 | /** | |
1682 | * @brief Alignment type. | |
1683 | * | |
1684 | * The value of _Align is a default-alignment which shall be the | |
1685 | * most stringent alignment requirement for any C++ object type | |
1686 | * whose size is no greater than _Len (3.9). The member typedef | |
1687 | * type shall be a POD type suitable for use as uninitialized | |
1688 | * storage for any object whose size is at most _Len and whose | |
1689 | * alignment is a divisor of _Align. | |
1690 | */ | |
1691 | template<std::size_t _Len, std::size_t _Align = | |
1692 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
1693 | struct aligned_storage | |
1694 | { | |
1695 | union type | |
1696 | { | |
1697 | unsigned char __data[_Len]; | |
1698 | struct __attribute__((__aligned__((_Align)))) { } __align; | |
1699 | }; | |
1700 | }; | |
1701 | ||
1702 | ||
1703 | // Decay trait for arrays and functions, used for perfect forwarding | |
1704 | // in make_pair, make_tuple, etc. | |
1705 | template<typename _Up, | |
1706 | bool _IsArray = is_array<_Up>::value, | |
1707 | bool _IsFunction = is_function<_Up>::value> | |
1708 | struct __decay_selector; | |
1709 | ||
1710 | // NB: DR 705. | |
1711 | template<typename _Up> | |
1712 | struct __decay_selector<_Up, false, false> | |
1713 | { typedef typename remove_cv<_Up>::type __type; }; | |
1714 | ||
1715 | template<typename _Up> | |
1716 | struct __decay_selector<_Up, true, false> | |
1717 | { typedef typename remove_extent<_Up>::type* __type; }; | |
1718 | ||
1719 | template<typename _Up> | |
1720 | struct __decay_selector<_Up, false, true> | |
1721 | { typedef typename add_pointer<_Up>::type __type; }; | |
1722 | ||
1723 | /// decay | |
1724 | template<typename _Tp> | |
1725 | class decay | |
1726 | { | |
1727 | typedef typename remove_reference<_Tp>::type __remove_type; | |
1728 | ||
1729 | public: | |
1730 | typedef typename __decay_selector<__remove_type>::__type type; | |
1731 | }; | |
1732 | ||
1733 | template<typename _Tp> | |
1734 | class reference_wrapper; | |
1735 | ||
1736 | // Helper which adds a reference to a type when given a reference_wrapper | |
1737 | template<typename _Tp> | |
1738 | struct __strip_reference_wrapper | |
1739 | { | |
1740 | typedef _Tp __type; | |
1741 | }; | |
1742 | ||
1743 | template<typename _Tp> | |
1744 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
1745 | { | |
1746 | typedef _Tp& __type; | |
1747 | }; | |
1748 | ||
1749 | template<typename _Tp> | |
1750 | struct __strip_reference_wrapper<const reference_wrapper<_Tp> > | |
1751 | { | |
1752 | typedef _Tp& __type; | |
1753 | }; | |
1754 | ||
1755 | template<typename _Tp> | |
1756 | struct __decay_and_strip | |
1757 | { | |
1758 | typedef typename __strip_reference_wrapper< | |
1759 | typename decay<_Tp>::type>::__type __type; | |
1760 | }; | |
1761 | ||
1762 | ||
123c516a | 1763 | // Primary template. |
13901e4b | 1764 | /// Define a member typedef @c type only if a boolean constant is true. |
123c516a PC |
1765 | template<bool, typename _Tp = void> |
1766 | struct enable_if | |
1767 | { }; | |
1768 | ||
1769 | // Partial specialization for true. | |
1770 | template<typename _Tp> | |
1771 | struct enable_if<true, _Tp> | |
1772 | { typedef _Tp type; }; | |
1773 | ||
1774 | ||
123c516a | 1775 | // Primary template. |
13901e4b | 1776 | /// Define a member typedef @c type to one of two argument types. |
123c516a PC |
1777 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
1778 | struct conditional | |
1779 | { typedef _Iftrue type; }; | |
1780 | ||
1781 | // Partial specialization for false. | |
1782 | template<typename _Iftrue, typename _Iffalse> | |
1783 | struct conditional<false, _Iftrue, _Iffalse> | |
1784 | { typedef _Iffalse type; }; | |
1785 | ||
5b9daa7e | 1786 | /// common_type |
cfa9a96b CF |
1787 | template<typename... _Tp> |
1788 | struct common_type; | |
1789 | ||
b3618b71 DK |
1790 | // sfinae-friendly common_type implementation: |
1791 | ||
1792 | struct __do_common_type_impl | |
1793 | { | |
1794 | template<typename _Tp, typename _Up> | |
6c5173c0 | 1795 | static __success_type<typename decay<decltype |
fe4e4e3b | 1796 | (true ? std::declval<_Tp>() |
6c5173c0 | 1797 | : std::declval<_Up>())>::type> _S_test(int); |
b3618b71 DK |
1798 | |
1799 | template<typename, typename> | |
1800 | static __failure_type _S_test(...); | |
1801 | }; | |
1802 | ||
1803 | template<typename _Tp, typename _Up> | |
1804 | struct __common_type_impl | |
1805 | : private __do_common_type_impl | |
1806 | { | |
1807 | typedef decltype(_S_test<_Tp, _Up>(0)) type; | |
1808 | }; | |
1809 | ||
1810 | struct __do_member_type_wrapper | |
1811 | { | |
1812 | template<typename _Tp> | |
1813 | static __success_type<typename _Tp::type> _S_test(int); | |
1814 | ||
1815 | template<typename> | |
1816 | static __failure_type _S_test(...); | |
1817 | }; | |
1818 | ||
1819 | template<typename _Tp> | |
1820 | struct __member_type_wrapper | |
1821 | : private __do_member_type_wrapper | |
1822 | { | |
1823 | typedef decltype(_S_test<_Tp>(0)) type; | |
1824 | }; | |
1825 | ||
1826 | template<typename _CTp, typename... _Args> | |
1827 | struct __expanded_common_type_wrapper | |
1828 | { | |
1829 | typedef common_type<typename _CTp::type, _Args...> type; | |
1830 | }; | |
1831 | ||
1832 | template<typename... _Args> | |
1833 | struct __expanded_common_type_wrapper<__failure_type, _Args...> | |
1834 | { typedef __failure_type type; }; | |
1835 | ||
cfa9a96b CF |
1836 | template<typename _Tp> |
1837 | struct common_type<_Tp> | |
6c5173c0 | 1838 | { typedef typename decay<_Tp>::type type; }; |
cfa9a96b CF |
1839 | |
1840 | template<typename _Tp, typename _Up> | |
7274deff | 1841 | struct common_type<_Tp, _Up> |
b3618b71 DK |
1842 | : public __common_type_impl<_Tp, _Up>::type |
1843 | { }; | |
cfa9a96b CF |
1844 | |
1845 | template<typename _Tp, typename _Up, typename... _Vp> | |
1846 | struct common_type<_Tp, _Up, _Vp...> | |
b3618b71 DK |
1847 | : public __expanded_common_type_wrapper<typename __member_type_wrapper< |
1848 | common_type<_Tp, _Up>>::type, _Vp...>::type | |
1849 | { }; | |
7274deff | 1850 | |
13901e4b | 1851 | /// The underlying type of an enum. |
a47407f6 PC |
1852 | template<typename _Tp> |
1853 | struct underlying_type | |
1854 | { | |
1855 | typedef __underlying_type(_Tp) type; | |
1856 | }; | |
123c516a | 1857 | |
7274deff PC |
1858 | template<typename _Tp> |
1859 | struct __declval_protector | |
1860 | { | |
1861 | static const bool __stop = false; | |
1862 | static typename add_rvalue_reference<_Tp>::type __delegate(); | |
1863 | }; | |
1864 | ||
1865 | template<typename _Tp> | |
1866 | inline typename add_rvalue_reference<_Tp>::type | |
e4f32cb0 | 1867 | declval() noexcept |
7274deff PC |
1868 | { |
1869 | static_assert(__declval_protector<_Tp>::__stop, | |
1870 | "declval() must not be used!"); | |
1871 | return __declval_protector<_Tp>::__delegate(); | |
1872 | } | |
1041daba | 1873 | |
be7f7822 JW |
1874 | /// result_of |
1875 | template<typename _Signature> | |
1876 | class result_of; | |
1877 | ||
b3618b71 | 1878 | // sfinae-friendly result_of implementation: |
83ddb39f DK |
1879 | |
1880 | // [func.require] paragraph 1 bullet 1: | |
1881 | struct __result_of_memfun_ref_impl | |
1882 | { | |
1883 | template<typename _Fp, typename _Tp1, typename... _Args> | |
1884 | static __success_type<decltype( | |
1885 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) | |
1886 | )> _S_test(int); | |
1887 | ||
1888 | template<typename...> | |
1889 | static __failure_type _S_test(...); | |
1890 | }; | |
1891 | ||
1892 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
1893 | struct __result_of_memfun_ref | |
1894 | : private __result_of_memfun_ref_impl | |
1895 | { | |
1896 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
1897 | }; | |
1898 | ||
1899 | // [func.require] paragraph 1 bullet 2: | |
1900 | struct __result_of_memfun_deref_impl | |
1901 | { | |
1902 | template<typename _Fp, typename _Tp1, typename... _Args> | |
1903 | static __success_type<decltype( | |
1904 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) | |
1905 | )> _S_test(int); | |
1906 | ||
1907 | template<typename...> | |
1908 | static __failure_type _S_test(...); | |
1909 | }; | |
1910 | ||
1911 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
1912 | struct __result_of_memfun_deref | |
1913 | : private __result_of_memfun_deref_impl | |
1914 | { | |
1915 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; | |
1916 | }; | |
1917 | ||
1918 | // [func.require] paragraph 1 bullet 3: | |
1919 | struct __result_of_memobj_ref_impl | |
1920 | { | |
1921 | template<typename _Fp, typename _Tp1> | |
1922 | static __success_type<decltype( | |
1923 | std::declval<_Tp1>().*std::declval<_Fp>() | |
1924 | )> _S_test(int); | |
1925 | ||
1926 | template<typename, typename> | |
1927 | static __failure_type _S_test(...); | |
1928 | }; | |
1929 | ||
1930 | template<typename _MemPtr, typename _Arg> | |
1931 | struct __result_of_memobj_ref | |
1932 | : private __result_of_memobj_ref_impl | |
1933 | { | |
1934 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
1935 | }; | |
1936 | ||
1937 | // [func.require] paragraph 1 bullet 4: | |
1938 | struct __result_of_memobj_deref_impl | |
1939 | { | |
1940 | template<typename _Fp, typename _Tp1> | |
1941 | static __success_type<decltype( | |
1942 | (*std::declval<_Tp1>()).*std::declval<_Fp>() | |
1943 | )> _S_test(int); | |
1944 | ||
1945 | template<typename, typename> | |
1946 | static __failure_type _S_test(...); | |
1947 | }; | |
1948 | ||
be7f7822 | 1949 | template<typename _MemPtr, typename _Arg> |
83ddb39f DK |
1950 | struct __result_of_memobj_deref |
1951 | : private __result_of_memobj_deref_impl | |
1952 | { | |
1953 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; | |
1954 | }; | |
1955 | ||
1956 | template<typename _MemPtr, typename _Arg> | |
1957 | struct __result_of_memobj; | |
be7f7822 JW |
1958 | |
1959 | template<typename _Res, typename _Class, typename _Arg> | |
83ddb39f | 1960 | struct __result_of_memobj<_Res _Class::*, _Arg> |
be7f7822 | 1961 | { |
83ddb39f DK |
1962 | typedef typename remove_cv<typename remove_reference< |
1963 | _Arg>::type>::type _Argval; | |
1964 | typedef _Res _Class::* _MemPtr; | |
1965 | typedef typename conditional<__or_<is_same<_Argval, _Class>, | |
1966 | is_base_of<_Class, _Argval>>::value, | |
1967 | __result_of_memobj_ref<_MemPtr, _Arg>, | |
1968 | __result_of_memobj_deref<_MemPtr, _Arg> | |
1969 | >::type::type type; | |
be7f7822 JW |
1970 | }; |
1971 | ||
83ddb39f DK |
1972 | template<typename _MemPtr, typename _Arg, typename... _Args> |
1973 | struct __result_of_memfun; | |
be7f7822 JW |
1974 | |
1975 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
83ddb39f | 1976 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
be7f7822 | 1977 | { |
83ddb39f DK |
1978 | typedef typename remove_cv<typename remove_reference< |
1979 | _Arg>::type>::type _Argval; | |
1980 | typedef _Res _Class::* _MemPtr; | |
1981 | typedef typename conditional<__or_<is_same<_Argval, _Class>, | |
1982 | is_base_of<_Class, _Argval>>::value, | |
1983 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, | |
1984 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> | |
1985 | >::type::type type; | |
be7f7822 JW |
1986 | }; |
1987 | ||
1988 | template<bool, bool, typename _Functor, typename... _ArgTypes> | |
83ddb39f | 1989 | struct __result_of_impl |
be7f7822 | 1990 | { |
83ddb39f | 1991 | typedef __failure_type type; |
be7f7822 JW |
1992 | }; |
1993 | ||
1994 | template<typename _MemPtr, typename _Arg> | |
83ddb39f DK |
1995 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
1996 | : public __result_of_memobj<typename decay<_MemPtr>::type, _Arg> | |
c4db9a77 | 1997 | { }; |
be7f7822 | 1998 | |
83ddb39f DK |
1999 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2000 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> | |
2001 | : public __result_of_memfun<typename decay<_MemPtr>::type, _Arg, _Args...> | |
c4db9a77 | 2002 | { }; |
be7f7822 | 2003 | |
83ddb39f DK |
2004 | // [func.require] paragraph 1 bullet 5: |
2005 | struct __result_of_other_impl | |
2006 | { | |
2007 | template<typename _Fn, typename... _Args> | |
2008 | static __success_type<decltype( | |
2009 | std::declval<_Fn>()(std::declval<_Args>()...) | |
2010 | )> _S_test(int); | |
2011 | ||
2012 | template<typename...> | |
2013 | static __failure_type _S_test(...); | |
2014 | }; | |
2015 | ||
be7f7822 | 2016 | template<typename _Functor, typename... _ArgTypes> |
83ddb39f DK |
2017 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2018 | : private __result_of_other_impl | |
be7f7822 | 2019 | { |
83ddb39f | 2020 | typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
be7f7822 JW |
2021 | }; |
2022 | ||
83ddb39f DK |
2023 | template<typename _Functor, typename... _ArgTypes> |
2024 | struct result_of<_Functor(_ArgTypes...)> | |
2025 | : public __result_of_impl< | |
2026 | is_member_object_pointer< | |
2027 | typename remove_reference<_Functor>::type | |
2028 | >::value, | |
2029 | is_member_function_pointer< | |
2030 | typename remove_reference<_Functor>::type | |
2031 | >::value, | |
2032 | _Functor, _ArgTypes... | |
2033 | >::type | |
2034 | { }; | |
2035 | ||
033b71ce PC |
2036 | /** |
2037 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
2038 | * member type _NTYPE. | |
2039 | */ | |
2040 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ | |
2041 | template<typename _Tp> \ | |
2042 | class __has_##_NTYPE##_helper \ | |
2043 | : __sfinae_types \ | |
2044 | { \ | |
2045 | template<typename _Up> \ | |
2046 | struct _Wrap_type \ | |
2047 | { }; \ | |
2048 | \ | |
2049 | template<typename _Up> \ | |
2050 | static __one __test(_Wrap_type<typename _Up::_NTYPE>*); \ | |
2051 | \ | |
2052 | template<typename _Up> \ | |
2053 | static __two __test(...); \ | |
2054 | \ | |
2055 | public: \ | |
f263981a | 2056 | static constexpr bool value = sizeof(__test<_Tp>(0)) == 1; \ |
033b71ce PC |
2057 | }; \ |
2058 | \ | |
2059 | template<typename _Tp> \ | |
2060 | struct __has_##_NTYPE \ | |
2061 | : integral_constant<bool, __has_##_NTYPE##_helper \ | |
2062 | <typename remove_cv<_Tp>::type>::value> \ | |
2063 | { }; | |
2064 | ||
13901e4b | 2065 | /// @} group metaprogramming |
12ffa228 BK |
2066 | _GLIBCXX_END_NAMESPACE_VERSION |
2067 | } // namespace | |
7b50cdef | 2068 | |
57317d2a PC |
2069 | #endif // __GXX_EXPERIMENTAL_CXX0X__ |
2070 | ||
7274deff | 2071 | #endif // _GLIBCXX_TYPE_TRAITS |