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5b9daa7e | 1 | // C++0x type_traits -*- C++ -*- |
af13a7a6 | 2 | |
123c516a | 3 | // Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
af13a7a6 BK |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
af13a7a6 BK |
9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
af13a7a6 BK |
24 | |
25 | /** @file include/type_traits | |
26 | * This is a Standard C++ Library header. | |
27 | */ | |
28 | ||
4514bed6 BK |
29 | #ifndef _GLIBCXX_TYPE_TRAITS |
30 | #define _GLIBCXX_TYPE_TRAITS 1 | |
af13a7a6 BK |
31 | |
32 | #pragma GCC system_header | |
33 | ||
57317d2a | 34 | #ifndef __GXX_EXPERIMENTAL_CXX0X__ |
ab65a4c7 | 35 | # include <bits/c++0x_warning.h> |
57317d2a | 36 | #else |
af13a7a6 | 37 | |
8fc81078 | 38 | #include <bits/c++config.h> |
e133ace8 | 39 | |
12ffa228 BK |
40 | namespace std _GLIBCXX_VISIBILITY(default) |
41 | { | |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
e133ace8 | 43 | |
8e32aa11 BK |
44 | /** |
45 | * @addtogroup metaprogramming | |
5b9daa7e BK |
46 | * @{ |
47 | */ | |
53dc5044 PC |
48 | struct __sfinae_types |
49 | { | |
50 | typedef char __one; | |
51 | typedef struct { char __arr[2]; } __two; | |
52 | }; | |
53 | ||
123c516a | 54 | // Meta programming helper types. |
53dc5044 | 55 | |
123c516a PC |
56 | template<bool, typename, typename> |
57 | struct conditional; | |
53dc5044 | 58 | |
123c516a PC |
59 | template<typename _Tp, _Tp> |
60 | struct integral_constant; | |
61 | ||
62 | template<typename, typename, typename...> | |
63 | struct __or_; | |
64 | ||
65 | template<typename _B1, typename _B2> | |
66 | struct __or_<_B1, _B2> | |
67 | : public conditional<_B1::value, _B1, _B2>::type | |
68 | { }; | |
69 | ||
70 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
71 | struct __or_<_B1, _B2, _B3, _Bn...> | |
72 | : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type | |
73 | { }; | |
53dc5044 | 74 | |
123c516a PC |
75 | template<typename, typename, typename...> |
76 | struct __and_; | |
53dc5044 | 77 | |
123c516a PC |
78 | template<typename _B1, typename _B2> |
79 | struct __and_<_B1, _B2> | |
80 | : public conditional<_B1::value, _B2, _B1>::type | |
81 | { }; | |
82 | ||
83 | template<typename _B1, typename _B2, typename _B3, typename... _Bn> | |
84 | struct __and_<_B1, _B2, _B3, _Bn...> | |
85 | : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type | |
86 | { }; | |
87 | ||
88 | template<typename _Pp> | |
89 | struct __not_ | |
90 | : public integral_constant<bool, !_Pp::value> | |
91 | { }; | |
92 | ||
93 | // helper class. | |
53dc5044 PC |
94 | |
95 | /// integral_constant | |
96 | template<typename _Tp, _Tp __v> | |
97 | struct integral_constant | |
98 | { | |
99 | static constexpr _Tp value = __v; | |
100 | typedef _Tp value_type; | |
101 | typedef integral_constant<_Tp, __v> type; | |
102 | constexpr operator value_type() { return value; } | |
103 | }; | |
104 | ||
105 | /// typedef for true_type | |
106 | typedef integral_constant<bool, true> true_type; | |
107 | ||
108 | /// typedef for false_type | |
109 | typedef integral_constant<bool, false> false_type; | |
110 | ||
111 | template<typename _Tp, _Tp __v> | |
112 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
113 | ||
123c516a PC |
114 | // primary type categories. |
115 | ||
53dc5044 PC |
116 | template<typename> |
117 | struct remove_cv; | |
118 | ||
119 | template<typename> | |
120 | struct __is_void_helper | |
121 | : public false_type { }; | |
53dc5044 | 122 | |
123c516a PC |
123 | template<> |
124 | struct __is_void_helper<void> | |
125 | : public true_type { }; | |
53dc5044 PC |
126 | |
127 | /// is_void | |
128 | template<typename _Tp> | |
129 | struct is_void | |
130 | : public integral_constant<bool, (__is_void_helper<typename | |
131 | remove_cv<_Tp>::type>::value)> | |
132 | { }; | |
133 | ||
134 | template<typename> | |
135 | struct __is_integral_helper | |
136 | : public false_type { }; | |
123c516a PC |
137 | |
138 | template<> | |
139 | struct __is_integral_helper<bool> | |
140 | : public true_type { }; | |
141 | ||
142 | template<> | |
143 | struct __is_integral_helper<char> | |
144 | : public true_type { }; | |
145 | ||
146 | template<> | |
147 | struct __is_integral_helper<signed char> | |
148 | : public true_type { }; | |
149 | ||
150 | template<> | |
151 | struct __is_integral_helper<unsigned char> | |
152 | : public true_type { }; | |
153 | ||
53dc5044 | 154 | #ifdef _GLIBCXX_USE_WCHAR_T |
123c516a PC |
155 | template<> |
156 | struct __is_integral_helper<wchar_t> | |
157 | : public true_type { }; | |
53dc5044 | 158 | #endif |
123c516a PC |
159 | |
160 | template<> | |
161 | struct __is_integral_helper<char16_t> | |
162 | : public true_type { }; | |
163 | ||
164 | template<> | |
165 | struct __is_integral_helper<char32_t> | |
166 | : public true_type { }; | |
167 | ||
168 | template<> | |
169 | struct __is_integral_helper<short> | |
170 | : public true_type { }; | |
171 | ||
172 | template<> | |
173 | struct __is_integral_helper<unsigned short> | |
174 | : public true_type { }; | |
175 | ||
176 | template<> | |
177 | struct __is_integral_helper<int> | |
178 | : public true_type { }; | |
179 | ||
180 | template<> | |
181 | struct __is_integral_helper<unsigned int> | |
182 | : public true_type { }; | |
183 | ||
184 | template<> | |
185 | struct __is_integral_helper<long> | |
186 | : public true_type { }; | |
187 | ||
188 | template<> | |
189 | struct __is_integral_helper<unsigned long> | |
190 | : public true_type { }; | |
191 | ||
192 | template<> | |
193 | struct __is_integral_helper<long long> | |
194 | : public true_type { }; | |
195 | ||
196 | template<> | |
197 | struct __is_integral_helper<unsigned long long> | |
198 | : public true_type { }; | |
53dc5044 PC |
199 | |
200 | /// is_integral | |
201 | template<typename _Tp> | |
202 | struct is_integral | |
203 | : public integral_constant<bool, (__is_integral_helper<typename | |
204 | remove_cv<_Tp>::type>::value)> | |
205 | { }; | |
206 | ||
207 | template<typename> | |
208 | struct __is_floating_point_helper | |
209 | : public false_type { }; | |
123c516a PC |
210 | |
211 | template<> | |
212 | struct __is_floating_point_helper<float> | |
213 | : public true_type { }; | |
214 | ||
215 | template<> | |
216 | struct __is_floating_point_helper<double> | |
217 | : public true_type { }; | |
218 | ||
219 | template<> | |
220 | struct __is_floating_point_helper<long double> | |
221 | : public true_type { }; | |
53dc5044 PC |
222 | |
223 | /// is_floating_point | |
224 | template<typename _Tp> | |
225 | struct is_floating_point | |
226 | : public integral_constant<bool, (__is_floating_point_helper<typename | |
227 | remove_cv<_Tp>::type>::value)> | |
228 | { }; | |
229 | ||
230 | /// is_array | |
231 | template<typename> | |
232 | struct is_array | |
233 | : public false_type { }; | |
234 | ||
235 | template<typename _Tp, std::size_t _Size> | |
236 | struct is_array<_Tp[_Size]> | |
237 | : public true_type { }; | |
238 | ||
239 | template<typename _Tp> | |
240 | struct is_array<_Tp[]> | |
241 | : public true_type { }; | |
242 | ||
243 | template<typename> | |
244 | struct __is_pointer_helper | |
245 | : public false_type { }; | |
123c516a PC |
246 | |
247 | template<typename _Tp> | |
248 | struct __is_pointer_helper<_Tp*> | |
249 | : public true_type { }; | |
53dc5044 PC |
250 | |
251 | /// is_pointer | |
252 | template<typename _Tp> | |
253 | struct is_pointer | |
254 | : public integral_constant<bool, (__is_pointer_helper<typename | |
255 | remove_cv<_Tp>::type>::value)> | |
256 | { }; | |
257 | ||
123c516a PC |
258 | /// is_lvalue_reference |
259 | template<typename> | |
260 | struct is_lvalue_reference | |
261 | : public false_type { }; | |
262 | ||
53dc5044 | 263 | template<typename _Tp> |
123c516a PC |
264 | struct is_lvalue_reference<_Tp&> |
265 | : public true_type { }; | |
266 | ||
267 | /// is_rvalue_reference | |
268 | template<typename> | |
269 | struct is_rvalue_reference | |
270 | : public false_type { }; | |
53dc5044 | 271 | |
53dc5044 | 272 | template<typename _Tp> |
123c516a PC |
273 | struct is_rvalue_reference<_Tp&&> |
274 | : public true_type { }; | |
275 | ||
276 | template<typename> | |
53dc5044 PC |
277 | struct is_function; |
278 | ||
279 | template<typename> | |
280 | struct __is_member_object_pointer_helper | |
281 | : public false_type { }; | |
123c516a PC |
282 | |
283 | template<typename _Tp, typename _Cp> | |
284 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
285 | : public integral_constant<bool, !is_function<_Tp>::value> { }; | |
53dc5044 PC |
286 | |
287 | /// is_member_object_pointer | |
288 | template<typename _Tp> | |
289 | struct is_member_object_pointer | |
290 | : public integral_constant<bool, (__is_member_object_pointer_helper< | |
291 | typename remove_cv<_Tp>::type>::value)> | |
292 | { }; | |
293 | ||
294 | template<typename> | |
295 | struct __is_member_function_pointer_helper | |
296 | : public false_type { }; | |
123c516a PC |
297 | |
298 | template<typename _Tp, typename _Cp> | |
299 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
300 | : public integral_constant<bool, is_function<_Tp>::value> { }; | |
53dc5044 PC |
301 | |
302 | /// is_member_function_pointer | |
303 | template<typename _Tp> | |
304 | struct is_member_function_pointer | |
305 | : public integral_constant<bool, (__is_member_function_pointer_helper< | |
306 | typename remove_cv<_Tp>::type>::value)> | |
307 | { }; | |
308 | ||
309 | /// is_enum | |
310 | template<typename _Tp> | |
311 | struct is_enum | |
312 | : public integral_constant<bool, __is_enum(_Tp)> | |
313 | { }; | |
314 | ||
315 | /// is_union | |
316 | template<typename _Tp> | |
317 | struct is_union | |
318 | : public integral_constant<bool, __is_union(_Tp)> | |
319 | { }; | |
320 | ||
321 | /// is_class | |
322 | template<typename _Tp> | |
323 | struct is_class | |
324 | : public integral_constant<bool, __is_class(_Tp)> | |
325 | { }; | |
326 | ||
327 | /// is_function | |
328 | template<typename> | |
329 | struct is_function | |
330 | : public false_type { }; | |
123c516a | 331 | |
53dc5044 PC |
332 | template<typename _Res, typename... _ArgTypes> |
333 | struct is_function<_Res(_ArgTypes...)> | |
334 | : public true_type { }; | |
123c516a | 335 | |
53dc5044 PC |
336 | template<typename _Res, typename... _ArgTypes> |
337 | struct is_function<_Res(_ArgTypes......)> | |
338 | : public true_type { }; | |
123c516a | 339 | |
53dc5044 PC |
340 | template<typename _Res, typename... _ArgTypes> |
341 | struct is_function<_Res(_ArgTypes...) const> | |
342 | : public true_type { }; | |
123c516a | 343 | |
53dc5044 PC |
344 | template<typename _Res, typename... _ArgTypes> |
345 | struct is_function<_Res(_ArgTypes......) const> | |
346 | : public true_type { }; | |
123c516a | 347 | |
53dc5044 PC |
348 | template<typename _Res, typename... _ArgTypes> |
349 | struct is_function<_Res(_ArgTypes...) volatile> | |
350 | : public true_type { }; | |
123c516a | 351 | |
53dc5044 PC |
352 | template<typename _Res, typename... _ArgTypes> |
353 | struct is_function<_Res(_ArgTypes......) volatile> | |
354 | : public true_type { }; | |
123c516a | 355 | |
53dc5044 PC |
356 | template<typename _Res, typename... _ArgTypes> |
357 | struct is_function<_Res(_ArgTypes...) const volatile> | |
358 | : public true_type { }; | |
123c516a | 359 | |
53dc5044 PC |
360 | template<typename _Res, typename... _ArgTypes> |
361 | struct is_function<_Res(_ArgTypes......) const volatile> | |
362 | : public true_type { }; | |
363 | ||
1e673415 PC |
364 | template<typename> |
365 | struct __is_nullptr_t_helper | |
366 | : public false_type { }; | |
123c516a PC |
367 | |
368 | template<> | |
369 | struct __is_nullptr_t_helper<std::nullptr_t> | |
370 | : public true_type { }; | |
1e673415 PC |
371 | |
372 | // __is_nullptr_t (extension). | |
373 | template<typename _Tp> | |
374 | struct __is_nullptr_t | |
375 | : public integral_constant<bool, (__is_nullptr_t_helper<typename | |
376 | remove_cv<_Tp>::type>::value)> | |
377 | { }; | |
378 | ||
123c516a PC |
379 | // composite type categories. |
380 | ||
381 | /// is_reference | |
382 | template<typename _Tp> | |
383 | struct is_reference | |
384 | : public __or_<is_lvalue_reference<_Tp>, | |
385 | is_rvalue_reference<_Tp>>::type | |
386 | { }; | |
387 | ||
53dc5044 PC |
388 | /// is_arithmetic |
389 | template<typename _Tp> | |
390 | struct is_arithmetic | |
123c516a | 391 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
392 | { }; |
393 | ||
394 | /// is_fundamental | |
395 | template<typename _Tp> | |
396 | struct is_fundamental | |
123c516a | 397 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>>::type |
53dc5044 PC |
398 | { }; |
399 | ||
400 | /// is_object | |
401 | template<typename _Tp> | |
402 | struct is_object | |
123c516a PC |
403 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
404 | is_void<_Tp>>>::type | |
53dc5044 PC |
405 | { }; |
406 | ||
123c516a | 407 | template<typename> |
53dc5044 PC |
408 | struct is_member_pointer; |
409 | ||
410 | /// is_scalar | |
411 | template<typename _Tp> | |
412 | struct is_scalar | |
123c516a PC |
413 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
414 | is_member_pointer<_Tp>, __is_nullptr_t<_Tp>>::type | |
53dc5044 PC |
415 | { }; |
416 | ||
417 | /// is_compound | |
418 | template<typename _Tp> | |
419 | struct is_compound | |
420 | : public integral_constant<bool, !is_fundamental<_Tp>::value> { }; | |
421 | ||
422 | /// is_member_pointer | |
423 | template<typename _Tp> | |
424 | struct __is_member_pointer_helper | |
425 | : public false_type { }; | |
123c516a PC |
426 | |
427 | template<typename _Tp, typename _Cp> | |
428 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
429 | : public true_type { }; | |
53dc5044 PC |
430 | |
431 | template<typename _Tp> | |
123c516a | 432 | struct is_member_pointer |
53dc5044 PC |
433 | : public integral_constant<bool, (__is_member_pointer_helper< |
434 | typename remove_cv<_Tp>::type>::value)> | |
435 | { }; | |
436 | ||
437 | // type properties. | |
123c516a | 438 | |
53dc5044 PC |
439 | /// is_const |
440 | template<typename> | |
441 | struct is_const | |
442 | : public false_type { }; | |
443 | ||
444 | template<typename _Tp> | |
445 | struct is_const<_Tp const> | |
446 | : public true_type { }; | |
447 | ||
448 | /// is_volatile | |
449 | template<typename> | |
450 | struct is_volatile | |
451 | : public false_type { }; | |
452 | ||
453 | template<typename _Tp> | |
454 | struct is_volatile<_Tp volatile> | |
455 | : public true_type { }; | |
456 | ||
123c516a PC |
457 | /// is_trivial |
458 | template<typename _Tp> | |
459 | struct is_trivial | |
460 | : public integral_constant<bool, __is_trivial(_Tp)> | |
461 | { }; | |
462 | ||
463 | /// is_trivially_copyable (still unimplemented) | |
464 | ||
465 | /// is_standard_layout | |
466 | template<typename _Tp> | |
467 | struct is_standard_layout | |
468 | : public integral_constant<bool, __is_standard_layout(_Tp)> | |
469 | { }; | |
470 | ||
471 | /// is_pod | |
472 | // Could use is_standard_layout && is_trivial instead of the builtin. | |
473 | template<typename _Tp> | |
474 | struct is_pod | |
475 | : public integral_constant<bool, __is_pod(_Tp)> | |
476 | { }; | |
477 | ||
478 | /// is_literal_type | |
479 | template<typename _Tp> | |
480 | struct is_literal_type | |
481 | : public integral_constant<bool, __is_literal_type(_Tp)> | |
482 | { }; | |
483 | ||
53dc5044 PC |
484 | /// is_empty |
485 | template<typename _Tp> | |
486 | struct is_empty | |
487 | : public integral_constant<bool, __is_empty(_Tp)> | |
488 | { }; | |
489 | ||
490 | /// is_polymorphic | |
491 | template<typename _Tp> | |
492 | struct is_polymorphic | |
493 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
494 | { }; | |
495 | ||
496 | /// is_abstract | |
497 | template<typename _Tp> | |
498 | struct is_abstract | |
499 | : public integral_constant<bool, __is_abstract(_Tp)> | |
500 | { }; | |
501 | ||
123c516a PC |
502 | template<typename _Tp, |
503 | bool = is_integral<_Tp>::value, | |
504 | bool = is_floating_point<_Tp>::value> | |
505 | struct __is_signed_helper | |
506 | : public false_type { }; | |
507 | ||
53dc5044 | 508 | template<typename _Tp> |
123c516a PC |
509 | struct __is_signed_helper<_Tp, false, true> |
510 | : public true_type { }; | |
511 | ||
512 | template<typename _Tp> | |
513 | struct __is_signed_helper<_Tp, true, false> | |
514 | : public integral_constant<bool, static_cast<bool>(_Tp(-1) < _Tp(0))> | |
53dc5044 PC |
515 | { }; |
516 | ||
123c516a | 517 | /// is_signed |
53dc5044 | 518 | template<typename _Tp> |
123c516a PC |
519 | struct is_signed |
520 | : public integral_constant<bool, __is_signed_helper<_Tp>::value> | |
521 | { }; | |
522 | ||
523 | /// is_unsigned | |
524 | template<typename _Tp> | |
525 | struct is_unsigned | |
526 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type | |
527 | { }; | |
528 | ||
529 | ||
530 | // destructible and constructible type properties | |
531 | ||
53dc5044 | 532 | template<typename> |
123c516a | 533 | struct add_rvalue_reference; |
53dc5044 PC |
534 | |
535 | template<typename _Tp> | |
123c516a | 536 | typename add_rvalue_reference<_Tp>::type declval() noexcept; |
53dc5044 | 537 | |
123c516a PC |
538 | template<typename, unsigned = 0> |
539 | struct extent; | |
540 | ||
541 | template<typename> | |
542 | struct remove_all_extents; | |
543 | ||
544 | template<typename _Tp> | |
545 | struct __is_array_known_bounds | |
546 | : public integral_constant<bool, (extent<_Tp>::value > 0)> | |
53dc5044 PC |
547 | { }; |
548 | ||
123c516a PC |
549 | template<typename _Tp> |
550 | struct __is_array_unknown_bounds | |
551 | : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>::type | |
53dc5044 PC |
552 | { }; |
553 | ||
123c516a PC |
554 | struct __do_is_destructible_impl_1 |
555 | { | |
556 | template<typename _Up> | |
557 | struct __w { _Up __u; }; | |
53dc5044 | 558 | |
123c516a PC |
559 | template<typename _Tp, typename |
560 | = decltype(declval<__w<_Tp>&>().~__w<_Tp>())> | |
561 | static true_type __test(int); | |
562 | ||
563 | template<typename> | |
564 | static false_type __test(...); | |
565 | }; | |
53dc5044 PC |
566 | |
567 | template<typename _Tp> | |
123c516a PC |
568 | struct __is_destructible_impl_1 |
569 | : public __do_is_destructible_impl_1 | |
570 | { | |
571 | typedef decltype(__test<_Tp>(0)) type; | |
572 | }; | |
53dc5044 | 573 | |
123c516a PC |
574 | struct __do_is_destructible_impl_2 |
575 | { | |
576 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> | |
577 | static true_type __test(int); | |
578 | ||
579 | template<typename> | |
580 | static false_type __test(...); | |
581 | }; | |
53dc5044 | 582 | |
53dc5044 | 583 | template<typename _Tp> |
123c516a PC |
584 | struct __is_destructible_impl_2 |
585 | : public __do_is_destructible_impl_2 | |
586 | { | |
587 | typedef decltype(__test<_Tp>(0)) type; | |
588 | }; | |
589 | ||
590 | template<typename _Tp, | |
591 | bool = __or_<is_void<_Tp>, | |
592 | __is_array_unknown_bounds<_Tp>>::value, | |
593 | bool = __or_<is_reference<_Tp>, is_function<_Tp>>::value> | |
594 | struct __is_destructible_safe; | |
53dc5044 PC |
595 | |
596 | template<typename _Tp> | |
123c516a PC |
597 | struct __is_destructible_safe<_Tp, false, false> |
598 | : public conditional<is_abstract<_Tp>::value, | |
599 | __is_destructible_impl_2<_Tp>, | |
600 | __is_destructible_impl_1<_Tp>>::type::type | |
601 | { }; | |
602 | ||
53dc5044 | 603 | template<typename _Tp> |
123c516a PC |
604 | struct __is_destructible_safe<_Tp, true, false> |
605 | : public false_type { }; | |
53dc5044 PC |
606 | |
607 | template<typename _Tp> | |
123c516a PC |
608 | struct __is_destructible_safe<_Tp, false, true> |
609 | : public true_type { }; | |
610 | ||
611 | /// is_destructible | |
53dc5044 | 612 | template<typename _Tp> |
123c516a PC |
613 | struct is_destructible |
614 | : public integral_constant<bool, (__is_destructible_safe<_Tp>::value)> | |
615 | { }; | |
616 | ||
617 | struct __do_is_default_constructible_impl | |
618 | { | |
619 | template<typename _Tp, typename = decltype(_Tp())> | |
620 | static true_type __test(int); | |
621 | ||
622 | template<typename> | |
623 | static false_type __test(...); | |
624 | }; | |
625 | ||
626 | template<typename _Tp> | |
627 | struct __is_default_constructible_impl | |
628 | : public __do_is_default_constructible_impl | |
53dc5044 | 629 | { |
123c516a | 630 | typedef decltype(__test<_Tp>(0)) type; |
53dc5044 | 631 | }; |
53dc5044 PC |
632 | |
633 | template<typename _Tp> | |
123c516a PC |
634 | struct __is_default_constructible_atom |
635 | : public __and_<is_destructible<_Tp>, | |
636 | __is_default_constructible_impl<_Tp>>::type::type | |
637 | { }; | |
53dc5044 | 638 | |
123c516a PC |
639 | template<typename _Tp, bool = is_array<_Tp>::value> |
640 | struct __is_default_constructible_safe; | |
53dc5044 | 641 | |
123c516a PC |
642 | // The following technique is a workaround for a gcc defect, which does |
643 | // not sfinae away attempts to default-construct arrays of unknown bounds. | |
644 | // Complete arrays can be default-constructed, if the element type is | |
645 | // default-constructible, but arrays with unknown bounds are not: | |
53dc5044 | 646 | |
53dc5044 | 647 | template<typename _Tp> |
123c516a PC |
648 | struct __is_default_constructible_safe<_Tp, true> |
649 | : public __and_<__is_array_known_bounds<_Tp>, | |
650 | __is_default_constructible_atom<typename | |
651 | remove_all_extents<_Tp>::type>>::type::type | |
53dc5044 PC |
652 | { }; |
653 | ||
53dc5044 | 654 | template<typename _Tp> |
123c516a PC |
655 | struct __is_default_constructible_safe<_Tp, false> |
656 | : public __is_default_constructible_atom<_Tp>::type | |
657 | { }; | |
4a27a739 | 658 | |
123c516a | 659 | /// is_default_constructible |
4a27a739 | 660 | template<typename _Tp> |
123c516a PC |
661 | struct is_default_constructible |
662 | : public integral_constant<bool, (__is_default_constructible_safe< | |
663 | _Tp>::value)> | |
664 | { }; | |
4a27a739 | 665 | |
123c516a PC |
666 | struct __do_is_static_castable_impl |
667 | { | |
668 | template<typename _From, typename _To, typename | |
669 | = decltype(static_cast<_To>(declval<_From>()))> | |
670 | static true_type __test(int); | |
4a27a739 | 671 | |
123c516a PC |
672 | template<typename, typename> |
673 | static false_type __test(...); | |
674 | }; | |
4a27a739 | 675 | |
123c516a PC |
676 | template<typename _From, typename _To> |
677 | struct __is_static_castable_impl | |
678 | : public __do_is_static_castable_impl | |
679 | { | |
680 | typedef decltype(__test<_From, _To>(0)) type; | |
681 | }; | |
939759fc | 682 | |
123c516a PC |
683 | template<typename _From, typename _To> |
684 | struct __is_static_castable_safe | |
685 | : public __and_<__or_<is_void<_To>, is_destructible<_To>>, | |
686 | __is_static_castable_impl<_From, _To>>::type::type | |
4a27a739 PC |
687 | { }; |
688 | ||
123c516a PC |
689 | // __is_static_castable |
690 | template<typename _From, typename _To> | |
691 | struct __is_static_castable | |
692 | : public integral_constant<bool, (__is_static_castable_safe< | |
693 | _From, _To>::value)> | |
694 | { }; | |
939759fc | 695 | |
123c516a PC |
696 | struct __do_is_direct_constructible_impl |
697 | { | |
698 | template<typename _Tp, typename _Arg, typename | |
699 | = decltype(::new _Tp(declval<_Arg>()))> | |
700 | static true_type __test(int); | |
4a27a739 | 701 | |
123c516a PC |
702 | template<typename, typename> |
703 | static false_type __test(...); | |
704 | }; | |
4a27a739 | 705 | |
123c516a PC |
706 | template<typename _Tp, typename _Arg> |
707 | struct __is_direct_constructible_impl | |
708 | : public __do_is_direct_constructible_impl | |
709 | { | |
710 | typedef decltype(__test<_Tp, _Arg>(0)) type; | |
711 | }; | |
4a27a739 | 712 | |
123c516a PC |
713 | template<typename _Tp, typename _Arg> |
714 | struct __is_direct_constructible_new_safe | |
715 | : public __and_<is_destructible<_Tp>, | |
716 | __is_direct_constructible_impl<_Tp, _Arg>>::type::type | |
717 | { }; | |
4a27a739 | 718 | |
123c516a PC |
719 | template<typename, typename> |
720 | struct is_same; | |
4a27a739 | 721 | |
123c516a PC |
722 | template<typename, typename> |
723 | struct is_base_of; | |
4a27a739 | 724 | |
123c516a PC |
725 | template<typename> |
726 | struct remove_reference; | |
4a27a739 | 727 | |
123c516a PC |
728 | template<typename _From, typename _To, bool |
729 | = is_reference<_From>::value> | |
730 | struct __is_base_to_derived_ref; | |
4a27a739 | 731 | |
123c516a PC |
732 | template<typename _From, typename _To> |
733 | struct __is_base_to_derived_ref<_From, _To, true> | |
734 | { | |
735 | typedef typename remove_cv<typename remove_reference<_From | |
736 | >::type>::type __src_t; | |
737 | typedef typename remove_cv<typename remove_reference<_To | |
738 | >::type>::type __dst_t; | |
739 | typedef typename __and_< | |
740 | __not_<is_same<__src_t, __dst_t>>, | |
741 | is_base_of<__src_t, __dst_t> | |
742 | >::type type; | |
743 | static constexpr bool value = type::value; | |
744 | }; | |
4a27a739 | 745 | |
123c516a PC |
746 | template<typename _From, typename _To> |
747 | struct __is_base_to_derived_ref<_From, _To, false> | |
748 | : public false_type | |
4a27a739 PC |
749 | { }; |
750 | ||
123c516a PC |
751 | template<typename _From, typename _To, bool |
752 | = __and_<is_lvalue_reference<_From>, | |
753 | is_rvalue_reference<_To>>::value> | |
754 | struct __is_lvalue_to_rvalue_ref; | |
e133ace8 | 755 | |
123c516a PC |
756 | template<typename _From, typename _To> |
757 | struct __is_lvalue_to_rvalue_ref<_From, _To, true> | |
758 | { | |
759 | typedef typename remove_cv<typename remove_reference< | |
760 | _From>::type>::type __src_t; | |
761 | typedef typename remove_cv<typename remove_reference< | |
762 | _To>::type>::type __dst_t; | |
763 | typedef typename __or_< | |
764 | is_same<__src_t, __dst_t>, | |
765 | is_base_of<__dst_t, __src_t> | |
766 | >::type type; | |
767 | static constexpr bool value = type::value; | |
768 | }; | |
e133ace8 | 769 | |
123c516a PC |
770 | template<typename _From, typename _To> |
771 | struct __is_lvalue_to_rvalue_ref<_From, _To, false> | |
772 | : public false_type | |
e133ace8 PC |
773 | { }; |
774 | ||
123c516a PC |
775 | // Here we handle direct-initialization to a reference type |
776 | // as equivalent to a static_cast modulo overshooting conversions. | |
777 | // These are restricted to the following conversion: | |
778 | // a) A base class to a derived class reference | |
779 | // b) An lvalue-reference to an rvalue-reference | |
e133ace8 | 780 | |
123c516a PC |
781 | template<typename _Tp, typename _Arg> |
782 | struct __is_direct_constructible_ref_cast | |
783 | : public __and_<__is_static_castable<_Arg, _Tp>, | |
784 | __not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>, | |
785 | __is_lvalue_to_rvalue_ref<_Arg, _Tp> | |
786 | >>>::type::type | |
e133ace8 PC |
787 | { }; |
788 | ||
123c516a PC |
789 | // Direct-initialization is tricky, because of functional |
790 | // casts: For a conversion to reference we fall back to a | |
791 | // static_cast modulo extra cases, otherwise we use a | |
792 | // new expression: | |
b0302c68 | 793 | |
123c516a PC |
794 | template<typename _Tp, typename _Arg> |
795 | struct __is_direct_constructible_new | |
796 | : public conditional<is_reference<_Tp>::value, | |
797 | __is_direct_constructible_ref_cast<_Tp, _Arg>, | |
798 | __is_direct_constructible_new_safe<_Tp, _Arg> | |
799 | >::type | |
b0302c68 PC |
800 | { }; |
801 | ||
123c516a PC |
802 | template<typename _Tp, typename _Arg> |
803 | struct __is_direct_constructible | |
804 | : public integral_constant<bool, (__is_direct_constructible_new< | |
805 | _Tp, _Arg>::type::value)> | |
e133ace8 PC |
806 | { }; |
807 | ||
123c516a PC |
808 | struct __do_is_nary_constructible_impl |
809 | { | |
810 | template<typename _Tp, typename... _Args, typename | |
811 | = decltype(_Tp(declval<_Args>()...))> | |
812 | static true_type __test(int); | |
2b08f2c5 | 813 | |
123c516a PC |
814 | template<typename, typename...> |
815 | static false_type __test(...); | |
816 | }; | |
b0302c68 PC |
817 | |
818 | template<typename _Tp, typename... _Args> | |
123c516a PC |
819 | struct __is_nary_constructible_impl |
820 | : public __do_is_nary_constructible_impl | |
b0302c68 | 821 | { |
123c516a | 822 | typedef decltype(__test<_Tp, _Args...>(0)) type; |
b0302c68 PC |
823 | }; |
824 | ||
123c516a PC |
825 | template<typename _Tp, typename... _Args> |
826 | struct __is_nary_constructible | |
827 | : public __and_<is_destructible<_Tp>, | |
828 | __is_nary_constructible_impl<_Tp, _Args...> | |
829 | >::type::type | |
b0302c68 | 830 | { |
123c516a PC |
831 | static_assert(sizeof...(_Args) > 1, |
832 | "Only useful for > 1 arguments"); | |
833 | }; | |
b0302c68 | 834 | |
123c516a PC |
835 | template<typename _Tp, typename... _Args> |
836 | struct __is_constructible_impl | |
837 | : public __is_nary_constructible<_Tp, _Args...> | |
838 | { }; | |
b0302c68 | 839 | |
123c516a PC |
840 | template<typename _Tp, typename _Arg> |
841 | struct __is_constructible_impl<_Tp, _Arg> | |
842 | : public __is_direct_constructible<_Tp, _Arg> | |
843 | { }; | |
844 | ||
845 | template<typename _Tp> | |
846 | struct __is_constructible_impl<_Tp> | |
847 | : public is_default_constructible<_Tp> | |
848 | { }; | |
b0302c68 PC |
849 | |
850 | /// is_constructible | |
b0302c68 PC |
851 | template<typename _Tp, typename... _Args> |
852 | struct is_constructible | |
123c516a PC |
853 | : public integral_constant<bool, (__is_constructible_impl<_Tp, |
854 | _Args...>::value)> | |
c32097d8 JM |
855 | { }; |
856 | ||
123c516a | 857 | |
e4f32cb0 PC |
858 | template<bool, typename _Tp, typename... _Args> |
859 | struct __is_nt_constructible_helper | |
860 | { static const bool __value = false; }; | |
861 | ||
862 | template<typename _Tp, typename... _Args> | |
863 | struct __is_nt_constructible_helper<true, _Tp, _Args...> | |
864 | { static const bool __value = noexcept(_Tp(declval<_Args>()...)); }; | |
865 | ||
866 | template<typename _Tp, typename _Arg> | |
867 | struct __is_nt_constructible_helper<true, _Tp, _Arg> | |
868 | { | |
869 | static const bool __value = noexcept(static_cast<_Tp>(declval<_Arg>())); | |
870 | }; | |
871 | ||
872 | /// is_nothrow_constructible | |
873 | template<typename _Tp, typename... _Args> | |
874 | struct is_nothrow_constructible | |
875 | : public integral_constant<bool, | |
876 | __is_nt_constructible_helper<is_constructible<_Tp, _Args...>::value, | |
877 | _Tp, _Args...>::__value> | |
878 | { }; | |
879 | ||
939759fc | 880 | /// has_trivial_default_constructor |
e133ace8 PC |
881 | template<typename _Tp> |
882 | struct has_trivial_default_constructor | |
883 | : public integral_constant<bool, __has_trivial_constructor(_Tp)> | |
884 | { }; | |
885 | ||
939759fc | 886 | /// has_trivial_copy_constructor |
e133ace8 PC |
887 | template<typename _Tp> |
888 | struct has_trivial_copy_constructor | |
889 | : public integral_constant<bool, __has_trivial_copy(_Tp)> | |
890 | { }; | |
891 | ||
6f5e9b8d | 892 | /// has_trivial_copy_assign |
e133ace8 | 893 | template<typename _Tp> |
6f5e9b8d | 894 | struct has_trivial_copy_assign |
e133ace8 PC |
895 | : public integral_constant<bool, __has_trivial_assign(_Tp)> |
896 | { }; | |
897 | ||
939759fc | 898 | /// has_trivial_destructor |
e133ace8 PC |
899 | template<typename _Tp> |
900 | struct has_trivial_destructor | |
901 | : public integral_constant<bool, __has_trivial_destructor(_Tp)> | |
902 | { }; | |
903 | ||
a7543cfd | 904 | /// has_nothrow_default_constructor |
e133ace8 PC |
905 | template<typename _Tp> |
906 | struct has_nothrow_default_constructor | |
907 | : public integral_constant<bool, __has_nothrow_constructor(_Tp)> | |
908 | { }; | |
909 | ||
a7543cfd | 910 | /// has_nothrow_copy_constructor |
e133ace8 PC |
911 | template<typename _Tp> |
912 | struct has_nothrow_copy_constructor | |
913 | : public integral_constant<bool, __has_nothrow_copy(_Tp)> | |
914 | { }; | |
915 | ||
6f5e9b8d | 916 | /// has_nothrow_copy_assign |
e133ace8 | 917 | template<typename _Tp> |
6f5e9b8d | 918 | struct has_nothrow_copy_assign |
e133ace8 PC |
919 | : public integral_constant<bool, __has_nothrow_assign(_Tp)> |
920 | { }; | |
921 | ||
123c516a PC |
922 | /// has_virtual_destructor |
923 | template<typename _Tp> | |
924 | struct has_virtual_destructor | |
925 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
926 | { }; | |
927 | ||
928 | ||
929 | // type property queries. | |
930 | ||
931 | /// alignment_of | |
932 | template<typename _Tp> | |
933 | struct alignment_of | |
934 | : public integral_constant<std::size_t, __alignof__(_Tp)> { }; | |
935 | ||
936 | /// rank | |
937 | template<typename> | |
938 | struct rank | |
939 | : public integral_constant<std::size_t, 0> { }; | |
940 | ||
941 | template<typename _Tp, std::size_t _Size> | |
942 | struct rank<_Tp[_Size]> | |
943 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
944 | ||
945 | template<typename _Tp> | |
946 | struct rank<_Tp[]> | |
947 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
948 | ||
949 | /// extent | |
950 | template<typename, unsigned _Uint> | |
951 | struct extent | |
952 | : public integral_constant<std::size_t, 0> { }; | |
953 | ||
954 | template<typename _Tp, unsigned _Uint, std::size_t _Size> | |
955 | struct extent<_Tp[_Size], _Uint> | |
956 | : public integral_constant<std::size_t, | |
957 | _Uint == 0 ? _Size : extent<_Tp, | |
958 | _Uint - 1>::value> | |
959 | { }; | |
960 | ||
961 | template<typename _Tp, unsigned _Uint> | |
962 | struct extent<_Tp[], _Uint> | |
963 | : public integral_constant<std::size_t, | |
964 | _Uint == 0 ? 0 : extent<_Tp, | |
965 | _Uint - 1>::value> | |
966 | { }; | |
967 | ||
968 | ||
969 | // type relations. | |
970 | ||
971 | /// is_same | |
972 | template<typename, typename> | |
973 | struct is_same | |
974 | : public false_type { }; | |
975 | ||
976 | template<typename _Tp> | |
977 | struct is_same<_Tp, _Tp> | |
978 | : public true_type { }; | |
b0302c68 | 979 | |
939759fc | 980 | /// is_base_of |
e133ace8 PC |
981 | template<typename _Base, typename _Derived> |
982 | struct is_base_of | |
983 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> | |
984 | { }; | |
985 | ||
297f34d7 | 986 | template<typename _From, typename _To, |
123c516a PC |
987 | bool = __or_<is_void<_From>, is_function<_To>, |
988 | is_array<_To>>::value> | |
297f34d7 | 989 | struct __is_convertible_helper |
8e7d962a | 990 | { static const bool __value = is_void<_To>::value; }; |
297f34d7 | 991 | |
e133ace8 | 992 | template<typename _From, typename _To> |
b0302c68 | 993 | class __is_convertible_helper<_From, _To, false> |
e133ace8 PC |
994 | : public __sfinae_types |
995 | { | |
8e7d962a PC |
996 | template<typename _To1> |
997 | static void __test_aux(_To1); | |
998 | ||
999 | template<typename _From1, typename _To1> | |
1000 | static decltype(__test_aux<_To1>(std::declval<_From1>()), __one()) | |
1001 | __test(int); | |
1002 | ||
1003 | template<typename, typename> | |
1004 | static __two __test(...); | |
297f34d7 | 1005 | |
e133ace8 | 1006 | public: |
8e7d962a | 1007 | static const bool __value = sizeof(__test<_From, _To>(0)) == 1; |
e133ace8 PC |
1008 | }; |
1009 | ||
b0302c68 | 1010 | /// is_convertible |
e133ace8 PC |
1011 | template<typename _From, typename _To> |
1012 | struct is_convertible | |
1013 | : public integral_constant<bool, | |
1014 | __is_convertible_helper<_From, _To>::__value> | |
1015 | { }; | |
1016 | ||
b0302c68 | 1017 | /// is_explicitly_convertible |
75995f37 PC |
1018 | template<typename _From, typename _To> |
1019 | struct is_explicitly_convertible | |
1020 | : public is_constructible<_To, _From> | |
1021 | { }; | |
1022 | ||
fd735b6a | 1023 | |
123c516a | 1024 | // const-volatile modifications. |
7b50cdef | 1025 | |
123c516a | 1026 | /// remove_const |
7b50cdef | 1027 | template<typename _Tp> |
123c516a PC |
1028 | struct remove_const |
1029 | { typedef _Tp type; }; | |
7b50cdef | 1030 | |
123c516a PC |
1031 | template<typename _Tp> |
1032 | struct remove_const<_Tp const> | |
1033 | { typedef _Tp type; }; | |
1034 | ||
1035 | /// remove_volatile | |
1036 | template<typename _Tp> | |
1037 | struct remove_volatile | |
1038 | { typedef _Tp type; }; | |
7b50cdef | 1039 | |
123c516a PC |
1040 | template<typename _Tp> |
1041 | struct remove_volatile<_Tp volatile> | |
1042 | { typedef _Tp type; }; | |
1043 | ||
1044 | /// remove_cv | |
1045 | template<typename _Tp> | |
1046 | struct remove_cv | |
1047 | { | |
1048 | typedef typename | |
1049 | remove_const<typename remove_volatile<_Tp>::type>::type type; | |
1050 | }; | |
1051 | ||
1052 | /// add_const | |
1053 | template<typename _Tp> | |
1054 | struct add_const | |
1055 | { typedef _Tp const type; }; | |
1056 | ||
1057 | /// add_volatile | |
1058 | template<typename _Tp> | |
1059 | struct add_volatile | |
1060 | { typedef _Tp volatile type; }; | |
1061 | ||
1062 | /// add_cv | |
1063 | template<typename _Tp> | |
1064 | struct add_cv | |
1065 | { | |
1066 | typedef typename | |
1067 | add_const<typename add_volatile<_Tp>::type>::type type; | |
1068 | }; | |
7b50cdef | 1069 | |
7b50cdef | 1070 | |
123c516a | 1071 | // Reference transformations. |
7b50cdef | 1072 | |
123c516a PC |
1073 | /// remove_reference |
1074 | template<typename _Tp> | |
1075 | struct remove_reference | |
1076 | { typedef _Tp type; }; | |
7b50cdef | 1077 | |
123c516a PC |
1078 | template<typename _Tp> |
1079 | struct remove_reference<_Tp&> | |
1080 | { typedef _Tp type; }; | |
7b50cdef | 1081 | |
123c516a PC |
1082 | template<typename _Tp> |
1083 | struct remove_reference<_Tp&&> | |
1084 | { typedef _Tp type; }; | |
1085 | ||
1086 | template<typename _Tp, | |
1087 | bool = __and_<__not_<is_reference<_Tp>>, | |
1088 | __not_<is_void<_Tp>>>::value, | |
1089 | bool = is_rvalue_reference<_Tp>::value> | |
1090 | struct __add_lvalue_reference_helper | |
1091 | { typedef _Tp type; }; | |
7b50cdef | 1092 | |
5e108459 | 1093 | template<typename _Tp> |
123c516a PC |
1094 | struct __add_lvalue_reference_helper<_Tp, true, false> |
1095 | { typedef _Tp& type; }; | |
5e108459 | 1096 | |
5e108459 | 1097 | template<typename _Tp> |
123c516a PC |
1098 | struct __add_lvalue_reference_helper<_Tp, false, true> |
1099 | { typedef typename remove_reference<_Tp>::type& type; }; | |
5e108459 | 1100 | |
123c516a | 1101 | /// add_lvalue_reference |
5e108459 | 1102 | template<typename _Tp> |
123c516a PC |
1103 | struct add_lvalue_reference |
1104 | : public __add_lvalue_reference_helper<_Tp> | |
1105 | { }; | |
1106 | ||
1107 | template<typename _Tp, | |
1108 | bool = __and_<__not_<is_reference<_Tp>>, | |
1109 | __not_<is_void<_Tp>>>::value> | |
1110 | struct __add_rvalue_reference_helper | |
1111 | { typedef _Tp type; }; | |
5e108459 PC |
1112 | |
1113 | template<typename _Tp> | |
123c516a PC |
1114 | struct __add_rvalue_reference_helper<_Tp, true> |
1115 | { typedef _Tp&& type; }; | |
5e108459 | 1116 | |
123c516a | 1117 | /// add_rvalue_reference |
5e108459 | 1118 | template<typename _Tp> |
123c516a PC |
1119 | struct add_rvalue_reference |
1120 | : public __add_rvalue_reference_helper<_Tp> | |
1121 | { }; | |
5e108459 | 1122 | |
7b50cdef | 1123 | |
123c516a PC |
1124 | // sign modifications. |
1125 | ||
7b50cdef BK |
1126 | // Utility for constructing identically cv-qualified types. |
1127 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1128 | struct __cv_selector; | |
1129 | ||
1130 | template<typename _Unqualified> | |
1131 | struct __cv_selector<_Unqualified, false, false> | |
1132 | { typedef _Unqualified __type; }; | |
1133 | ||
1134 | template<typename _Unqualified> | |
1135 | struct __cv_selector<_Unqualified, false, true> | |
1136 | { typedef volatile _Unqualified __type; }; | |
1137 | ||
1138 | template<typename _Unqualified> | |
1139 | struct __cv_selector<_Unqualified, true, false> | |
1140 | { typedef const _Unqualified __type; }; | |
1141 | ||
1142 | template<typename _Unqualified> | |
1143 | struct __cv_selector<_Unqualified, true, true> | |
1144 | { typedef const volatile _Unqualified __type; }; | |
1145 | ||
1146 | template<typename _Qualified, typename _Unqualified, | |
1147 | bool _IsConst = is_const<_Qualified>::value, | |
1148 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1149 | class __match_cv_qualifiers |
7b50cdef | 1150 | { |
7b50cdef BK |
1151 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1152 | ||
1153 | public: | |
1154 | typedef typename __match::__type __type; | |
1155 | }; | |
1156 | ||
7b50cdef BK |
1157 | // Utility for finding the unsigned versions of signed integral types. |
1158 | template<typename _Tp> | |
e133ace8 PC |
1159 | struct __make_unsigned |
1160 | { typedef _Tp __type; }; | |
7b50cdef BK |
1161 | |
1162 | template<> | |
1163 | struct __make_unsigned<char> | |
1164 | { typedef unsigned char __type; }; | |
1165 | ||
1166 | template<> | |
1167 | struct __make_unsigned<signed char> | |
1168 | { typedef unsigned char __type; }; | |
1169 | ||
7b50cdef BK |
1170 | template<> |
1171 | struct __make_unsigned<short> | |
1172 | { typedef unsigned short __type; }; | |
1173 | ||
1174 | template<> | |
1175 | struct __make_unsigned<int> | |
1176 | { typedef unsigned int __type; }; | |
1177 | ||
1178 | template<> | |
1179 | struct __make_unsigned<long> | |
1180 | { typedef unsigned long __type; }; | |
1181 | ||
1182 | template<> | |
1183 | struct __make_unsigned<long long> | |
1184 | { typedef unsigned long long __type; }; | |
1185 | ||
7b50cdef BK |
1186 | // Select between integral and enum: not possible to be both. |
1187 | template<typename _Tp, | |
1188 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1189 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1190 | class __make_unsigned_selector; |
1191 | ||
7b50cdef | 1192 | template<typename _Tp> |
b0302c68 | 1193 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1194 | { |
7b50cdef BK |
1195 | typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt; |
1196 | typedef typename __unsignedt::__type __unsigned_type; | |
1197 | typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned; | |
1198 | ||
1199 | public: | |
1200 | typedef typename __cv_unsigned::__type __type; | |
1201 | }; | |
1202 | ||
7b50cdef | 1203 | template<typename _Tp> |
b0302c68 | 1204 | class __make_unsigned_selector<_Tp, false, true> |
7b50cdef | 1205 | { |
a0230468 MM |
1206 | // With -fshort-enums, an enum may be as small as a char. |
1207 | typedef unsigned char __smallest; | |
1208 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1209 | static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short); | |
ce2e6349 | 1210 | static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int); |
a0230468 MM |
1211 | typedef conditional<__b2, unsigned int, unsigned long> __cond2; |
1212 | typedef typename __cond2::type __cond2_type; | |
1213 | typedef conditional<__b1, unsigned short, __cond2_type> __cond1; | |
1214 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1215 | |
1216 | public: | |
a0230468 | 1217 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1218 | }; |
1219 | ||
7b50cdef BK |
1220 | // Given an integral/enum type, return the corresponding unsigned |
1221 | // integer type. | |
5b9daa7e BK |
1222 | // Primary template. |
1223 | /// make_unsigned | |
7b50cdef BK |
1224 | template<typename _Tp> |
1225 | struct make_unsigned | |
1226 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; | |
1227 | ||
1228 | // Integral, but don't define. | |
1229 | template<> | |
1230 | struct make_unsigned<bool>; | |
1231 | ||
1232 | ||
1233 | // Utility for finding the signed versions of unsigned integral types. | |
1234 | template<typename _Tp> | |
e133ace8 PC |
1235 | struct __make_signed |
1236 | { typedef _Tp __type; }; | |
7b50cdef BK |
1237 | |
1238 | template<> | |
1239 | struct __make_signed<char> | |
1240 | { typedef signed char __type; }; | |
1241 | ||
1242 | template<> | |
1243 | struct __make_signed<unsigned char> | |
1244 | { typedef signed char __type; }; | |
1245 | ||
7b50cdef BK |
1246 | template<> |
1247 | struct __make_signed<unsigned short> | |
1248 | { typedef signed short __type; }; | |
1249 | ||
1250 | template<> | |
1251 | struct __make_signed<unsigned int> | |
1252 | { typedef signed int __type; }; | |
1253 | ||
1254 | template<> | |
1255 | struct __make_signed<unsigned long> | |
1256 | { typedef signed long __type; }; | |
1257 | ||
1258 | template<> | |
1259 | struct __make_signed<unsigned long long> | |
1260 | { typedef signed long long __type; }; | |
1261 | ||
fb8ffd10 | 1262 | // Select between integral and enum: not possible to be both. |
7b50cdef BK |
1263 | template<typename _Tp, |
1264 | bool _IsInt = is_integral<_Tp>::value, | |
7b50cdef | 1265 | bool _IsEnum = is_enum<_Tp>::value> |
b0302c68 PC |
1266 | class __make_signed_selector; |
1267 | ||
7b50cdef | 1268 | template<typename _Tp> |
b0302c68 | 1269 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1270 | { |
7b50cdef BK |
1271 | typedef __make_signed<typename remove_cv<_Tp>::type> __signedt; |
1272 | typedef typename __signedt::__type __signed_type; | |
1273 | typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed; | |
1274 | ||
1275 | public: | |
1276 | typedef typename __cv_signed::__type __type; | |
1277 | }; | |
1278 | ||
7b50cdef | 1279 | template<typename _Tp> |
b0302c68 | 1280 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1281 | { |
a0230468 MM |
1282 | // With -fshort-enums, an enum may be as small as a char. |
1283 | typedef signed char __smallest; | |
1284 | static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest); | |
1285 | static const bool __b1 = sizeof(_Tp) <= sizeof(signed short); | |
ce2e6349 | 1286 | static const bool __b2 = sizeof(_Tp) <= sizeof(signed int); |
a0230468 MM |
1287 | typedef conditional<__b2, signed int, signed long> __cond2; |
1288 | typedef typename __cond2::type __cond2_type; | |
1289 | typedef conditional<__b1, signed short, __cond2_type> __cond1; | |
1290 | typedef typename __cond1::type __cond1_type; | |
7b50cdef BK |
1291 | |
1292 | public: | |
a0230468 | 1293 | typedef typename conditional<__b0, __smallest, __cond1_type>::type __type; |
7b50cdef BK |
1294 | }; |
1295 | ||
7b50cdef BK |
1296 | // Given an integral/enum type, return the corresponding signed |
1297 | // integer type. | |
5b9daa7e BK |
1298 | // Primary template. |
1299 | /// make_signed | |
7b50cdef BK |
1300 | template<typename _Tp> |
1301 | struct make_signed | |
1302 | { typedef typename __make_signed_selector<_Tp>::__type type; }; | |
1303 | ||
1304 | // Integral, but don't define. | |
1305 | template<> | |
1306 | struct make_signed<bool>; | |
cfa9a96b | 1307 | |
123c516a PC |
1308 | |
1309 | // array modifications. | |
1310 | ||
1311 | /// remove_extent | |
1312 | template<typename _Tp> | |
1313 | struct remove_extent | |
1314 | { typedef _Tp type; }; | |
1315 | ||
1316 | template<typename _Tp, std::size_t _Size> | |
1317 | struct remove_extent<_Tp[_Size]> | |
1318 | { typedef _Tp type; }; | |
1319 | ||
1320 | template<typename _Tp> | |
1321 | struct remove_extent<_Tp[]> | |
1322 | { typedef _Tp type; }; | |
1323 | ||
1324 | /// remove_all_extents | |
1325 | template<typename _Tp> | |
1326 | struct remove_all_extents | |
1327 | { typedef _Tp type; }; | |
1328 | ||
1329 | template<typename _Tp, std::size_t _Size> | |
1330 | struct remove_all_extents<_Tp[_Size]> | |
1331 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1332 | ||
1333 | template<typename _Tp> | |
1334 | struct remove_all_extents<_Tp[]> | |
1335 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
1336 | ||
1337 | ||
1338 | // pointer modifications. | |
1339 | ||
1340 | template<typename _Tp, typename> | |
1341 | struct __remove_pointer_helper | |
1342 | { typedef _Tp type; }; | |
1343 | ||
1344 | template<typename _Tp, typename _Up> | |
1345 | struct __remove_pointer_helper<_Tp, _Up*> | |
1346 | { typedef _Up type; }; | |
1347 | ||
1348 | /// remove_pointer | |
1349 | template<typename _Tp> | |
1350 | struct remove_pointer | |
1351 | : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> | |
1352 | { }; | |
1353 | ||
1354 | /// add_pointer | |
1355 | template<typename _Tp> | |
1356 | struct add_pointer | |
1357 | { typedef typename remove_reference<_Tp>::type* type; }; | |
1358 | ||
1359 | ||
1360 | template<std::size_t _Len> | |
1361 | struct __aligned_storage_msa | |
1362 | { | |
1363 | union __type | |
1364 | { | |
1365 | unsigned char __data[_Len]; | |
1366 | struct __attribute__((__aligned__)) { } __align; | |
1367 | }; | |
1368 | }; | |
1369 | ||
1370 | /** | |
1371 | * @brief Alignment type. | |
1372 | * | |
1373 | * The value of _Align is a default-alignment which shall be the | |
1374 | * most stringent alignment requirement for any C++ object type | |
1375 | * whose size is no greater than _Len (3.9). The member typedef | |
1376 | * type shall be a POD type suitable for use as uninitialized | |
1377 | * storage for any object whose size is at most _Len and whose | |
1378 | * alignment is a divisor of _Align. | |
1379 | */ | |
1380 | template<std::size_t _Len, std::size_t _Align = | |
1381 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
1382 | struct aligned_storage | |
1383 | { | |
1384 | union type | |
1385 | { | |
1386 | unsigned char __data[_Len]; | |
1387 | struct __attribute__((__aligned__((_Align)))) { } __align; | |
1388 | }; | |
1389 | }; | |
1390 | ||
1391 | ||
1392 | // Decay trait for arrays and functions, used for perfect forwarding | |
1393 | // in make_pair, make_tuple, etc. | |
1394 | template<typename _Up, | |
1395 | bool _IsArray = is_array<_Up>::value, | |
1396 | bool _IsFunction = is_function<_Up>::value> | |
1397 | struct __decay_selector; | |
1398 | ||
1399 | // NB: DR 705. | |
1400 | template<typename _Up> | |
1401 | struct __decay_selector<_Up, false, false> | |
1402 | { typedef typename remove_cv<_Up>::type __type; }; | |
1403 | ||
1404 | template<typename _Up> | |
1405 | struct __decay_selector<_Up, true, false> | |
1406 | { typedef typename remove_extent<_Up>::type* __type; }; | |
1407 | ||
1408 | template<typename _Up> | |
1409 | struct __decay_selector<_Up, false, true> | |
1410 | { typedef typename add_pointer<_Up>::type __type; }; | |
1411 | ||
1412 | /// decay | |
1413 | template<typename _Tp> | |
1414 | class decay | |
1415 | { | |
1416 | typedef typename remove_reference<_Tp>::type __remove_type; | |
1417 | ||
1418 | public: | |
1419 | typedef typename __decay_selector<__remove_type>::__type type; | |
1420 | }; | |
1421 | ||
1422 | template<typename _Tp> | |
1423 | class reference_wrapper; | |
1424 | ||
1425 | // Helper which adds a reference to a type when given a reference_wrapper | |
1426 | template<typename _Tp> | |
1427 | struct __strip_reference_wrapper | |
1428 | { | |
1429 | typedef _Tp __type; | |
1430 | }; | |
1431 | ||
1432 | template<typename _Tp> | |
1433 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
1434 | { | |
1435 | typedef _Tp& __type; | |
1436 | }; | |
1437 | ||
1438 | template<typename _Tp> | |
1439 | struct __strip_reference_wrapper<const reference_wrapper<_Tp> > | |
1440 | { | |
1441 | typedef _Tp& __type; | |
1442 | }; | |
1443 | ||
1444 | template<typename _Tp> | |
1445 | struct __decay_and_strip | |
1446 | { | |
1447 | typedef typename __strip_reference_wrapper< | |
1448 | typename decay<_Tp>::type>::__type __type; | |
1449 | }; | |
1450 | ||
1451 | ||
1452 | // Define a nested type if some predicate holds. | |
1453 | // Primary template. | |
1454 | /// enable_if | |
1455 | template<bool, typename _Tp = void> | |
1456 | struct enable_if | |
1457 | { }; | |
1458 | ||
1459 | // Partial specialization for true. | |
1460 | template<typename _Tp> | |
1461 | struct enable_if<true, _Tp> | |
1462 | { typedef _Tp type; }; | |
1463 | ||
1464 | ||
1465 | // A conditional expression, but for types. If true, first, if false, second. | |
1466 | // Primary template. | |
1467 | /// conditional | |
1468 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
1469 | struct conditional | |
1470 | { typedef _Iftrue type; }; | |
1471 | ||
1472 | // Partial specialization for false. | |
1473 | template<typename _Iftrue, typename _Iffalse> | |
1474 | struct conditional<false, _Iftrue, _Iffalse> | |
1475 | { typedef _Iffalse type; }; | |
1476 | ||
1477 | ||
5b9daa7e | 1478 | /// common_type |
cfa9a96b CF |
1479 | template<typename... _Tp> |
1480 | struct common_type; | |
1481 | ||
1482 | template<typename _Tp> | |
1483 | struct common_type<_Tp> | |
7274deff | 1484 | { typedef _Tp type; }; |
cfa9a96b CF |
1485 | |
1486 | template<typename _Tp, typename _Up> | |
7274deff PC |
1487 | struct common_type<_Tp, _Up> |
1488 | { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; }; | |
cfa9a96b CF |
1489 | |
1490 | template<typename _Tp, typename _Up, typename... _Vp> | |
1491 | struct common_type<_Tp, _Up, _Vp...> | |
1492 | { | |
1493 | typedef typename | |
1494 | common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type; | |
1495 | }; | |
7274deff | 1496 | |
123c516a PC |
1497 | /// underlying_type (still unimplemented) |
1498 | ||
1499 | /// result_of | |
1500 | template<typename _Signature> | |
1501 | class result_of; | |
1502 | ||
1503 | template<typename _Functor, typename... _ArgTypes> | |
1504 | struct result_of<_Functor(_ArgTypes...)> | |
1505 | { | |
1506 | typedef | |
1507 | decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) ) | |
1508 | type; | |
1509 | }; | |
1510 | ||
7274deff PC |
1511 | /// declval |
1512 | template<typename _Tp> | |
1513 | struct __declval_protector | |
1514 | { | |
1515 | static const bool __stop = false; | |
1516 | static typename add_rvalue_reference<_Tp>::type __delegate(); | |
1517 | }; | |
1518 | ||
1519 | template<typename _Tp> | |
1520 | inline typename add_rvalue_reference<_Tp>::type | |
e4f32cb0 | 1521 | declval() noexcept |
7274deff PC |
1522 | { |
1523 | static_assert(__declval_protector<_Tp>::__stop, | |
1524 | "declval() must not be used!"); | |
1525 | return __declval_protector<_Tp>::__delegate(); | |
1526 | } | |
1041daba | 1527 | |
033b71ce PC |
1528 | /** |
1529 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
1530 | * member type _NTYPE. | |
1531 | */ | |
1532 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ | |
1533 | template<typename _Tp> \ | |
1534 | class __has_##_NTYPE##_helper \ | |
1535 | : __sfinae_types \ | |
1536 | { \ | |
1537 | template<typename _Up> \ | |
1538 | struct _Wrap_type \ | |
1539 | { }; \ | |
1540 | \ | |
1541 | template<typename _Up> \ | |
1542 | static __one __test(_Wrap_type<typename _Up::_NTYPE>*); \ | |
1543 | \ | |
1544 | template<typename _Up> \ | |
1545 | static __two __test(...); \ | |
1546 | \ | |
1547 | public: \ | |
1548 | static const bool value = sizeof(__test<_Tp>(0)) == 1; \ | |
1549 | }; \ | |
1550 | \ | |
1551 | template<typename _Tp> \ | |
1552 | struct __has_##_NTYPE \ | |
1553 | : integral_constant<bool, __has_##_NTYPE##_helper \ | |
1554 | <typename remove_cv<_Tp>::type>::value> \ | |
1555 | { }; | |
1556 | ||
1041daba | 1557 | // @} group metaprogramming |
12ffa228 BK |
1558 | _GLIBCXX_END_NAMESPACE_VERSION |
1559 | } // namespace | |
7b50cdef | 1560 | |
57317d2a PC |
1561 | #endif // __GXX_EXPERIMENTAL_CXX0X__ |
1562 | ||
7274deff | 1563 | #endif // _GLIBCXX_TYPE_TRAITS |