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493bc460 PC |
1 | // TR1 type_traits -*- C++ -*- |
2 | ||
8fc81078 PC |
3 | // Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
4 | // Free Software Foundation, Inc. | |
493bc460 PC |
5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
748086b7 | 9 | // Free Software Foundation; either version 3, or (at your option) |
493bc460 PC |
10 | // any later version. |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
748086b7 JJ |
17 | // Under Section 7 of GPL version 3, you are granted additional |
18 | // permissions described in the GCC Runtime Library Exception, version | |
19 | // 3.1, as published by the Free Software Foundation. | |
493bc460 | 20 | |
748086b7 JJ |
21 | // You should have received a copy of the GNU General Public License and |
22 | // a copy of the GCC Runtime Library Exception along with this program; | |
23 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | // <http://www.gnu.org/licenses/>. | |
909a9d44 | 25 | |
143c27b0 | 26 | /** @file tr1/type_traits |
493bc460 PC |
27 | * This is a TR1 C++ Library header. |
28 | */ | |
29 | ||
e133ace8 PC |
30 | #ifndef _GLIBCXX_TR1_TYPE_TRAITS |
31 | #define _GLIBCXX_TR1_TYPE_TRAITS 1 | |
493bc460 | 32 | |
05beb8e7 PC |
33 | #pragma GCC system_header |
34 | ||
8fc81078 | 35 | #include <bits/c++config.h> |
e133ace8 | 36 | |
12ffa228 | 37 | namespace std _GLIBCXX_VISIBILITY(default) |
493bc460 | 38 | { |
e133ace8 PC |
39 | namespace tr1 |
40 | { | |
12ffa228 BK |
41 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
42 | ||
53dc5044 PC |
43 | /** |
44 | * @defgroup metaprogramming Type Traits | |
45 | * @ingroup utilities | |
46 | * | |
47 | * Compile time type transformation and information. | |
48 | * @{ | |
49 | */ | |
50 | ||
51 | struct __sfinae_types | |
52 | { | |
53 | typedef char __one; | |
54 | typedef struct { char __arr[2]; } __two; | |
55 | }; | |
56 | ||
57 | #define _DEFINE_SPEC_0_HELPER \ | |
58 | template<> | |
59 | ||
60 | #define _DEFINE_SPEC_1_HELPER \ | |
61 | template<typename _Tp> | |
62 | ||
63 | #define _DEFINE_SPEC_2_HELPER \ | |
64 | template<typename _Tp, typename _Cp> | |
65 | ||
66 | #define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \ | |
67 | _DEFINE_SPEC_##_Order##_HELPER \ | |
68 | struct _Trait<_Type> \ | |
69 | : public integral_constant<bool, _Value> { }; | |
70 | ||
71 | // helper classes [4.3]. | |
72 | ||
73 | /// integral_constant | |
74 | template<typename _Tp, _Tp __v> | |
75 | struct integral_constant | |
76 | { | |
77 | static const _Tp value = __v; | |
78 | typedef _Tp value_type; | |
79 | typedef integral_constant<_Tp, __v> type; | |
80 | }; | |
81 | ||
82 | /// typedef for true_type | |
83 | typedef integral_constant<bool, true> true_type; | |
84 | ||
85 | /// typedef for false_type | |
86 | typedef integral_constant<bool, false> false_type; | |
87 | ||
88 | template<typename _Tp, _Tp __v> | |
89 | const _Tp integral_constant<_Tp, __v>::value; | |
90 | ||
91 | /// remove_cv | |
92 | template<typename> | |
93 | struct remove_cv; | |
94 | ||
95 | template<typename> | |
96 | struct __is_void_helper | |
97 | : public false_type { }; | |
98 | _DEFINE_SPEC(0, __is_void_helper, void, true) | |
99 | ||
100 | // primary type categories [4.5.1]. | |
101 | ||
102 | /// is_void | |
103 | template<typename _Tp> | |
104 | struct is_void | |
105 | : public integral_constant<bool, (__is_void_helper<typename | |
106 | remove_cv<_Tp>::type>::value)> | |
107 | { }; | |
108 | ||
109 | template<typename> | |
110 | struct __is_integral_helper | |
111 | : public false_type { }; | |
112 | _DEFINE_SPEC(0, __is_integral_helper, bool, true) | |
113 | _DEFINE_SPEC(0, __is_integral_helper, char, true) | |
114 | _DEFINE_SPEC(0, __is_integral_helper, signed char, true) | |
115 | _DEFINE_SPEC(0, __is_integral_helper, unsigned char, true) | |
116 | #ifdef _GLIBCXX_USE_WCHAR_T | |
117 | _DEFINE_SPEC(0, __is_integral_helper, wchar_t, true) | |
118 | #endif | |
119 | _DEFINE_SPEC(0, __is_integral_helper, short, true) | |
120 | _DEFINE_SPEC(0, __is_integral_helper, unsigned short, true) | |
121 | _DEFINE_SPEC(0, __is_integral_helper, int, true) | |
122 | _DEFINE_SPEC(0, __is_integral_helper, unsigned int, true) | |
123 | _DEFINE_SPEC(0, __is_integral_helper, long, true) | |
124 | _DEFINE_SPEC(0, __is_integral_helper, unsigned long, true) | |
125 | _DEFINE_SPEC(0, __is_integral_helper, long long, true) | |
126 | _DEFINE_SPEC(0, __is_integral_helper, unsigned long long, true) | |
127 | ||
128 | /// is_integral | |
129 | template<typename _Tp> | |
130 | struct is_integral | |
131 | : public integral_constant<bool, (__is_integral_helper<typename | |
132 | remove_cv<_Tp>::type>::value)> | |
133 | { }; | |
134 | ||
135 | template<typename> | |
136 | struct __is_floating_point_helper | |
137 | : public false_type { }; | |
138 | _DEFINE_SPEC(0, __is_floating_point_helper, float, true) | |
139 | _DEFINE_SPEC(0, __is_floating_point_helper, double, true) | |
140 | _DEFINE_SPEC(0, __is_floating_point_helper, long double, true) | |
141 | ||
142 | /// is_floating_point | |
143 | template<typename _Tp> | |
144 | struct is_floating_point | |
145 | : public integral_constant<bool, (__is_floating_point_helper<typename | |
146 | remove_cv<_Tp>::type>::value)> | |
147 | { }; | |
148 | ||
149 | /// is_array | |
150 | template<typename> | |
151 | struct is_array | |
152 | : public false_type { }; | |
153 | ||
154 | template<typename _Tp, std::size_t _Size> | |
155 | struct is_array<_Tp[_Size]> | |
156 | : public true_type { }; | |
157 | ||
158 | template<typename _Tp> | |
159 | struct is_array<_Tp[]> | |
160 | : public true_type { }; | |
161 | ||
162 | template<typename> | |
163 | struct __is_pointer_helper | |
164 | : public false_type { }; | |
165 | _DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true) | |
166 | ||
167 | /// is_pointer | |
168 | template<typename _Tp> | |
169 | struct is_pointer | |
170 | : public integral_constant<bool, (__is_pointer_helper<typename | |
171 | remove_cv<_Tp>::type>::value)> | |
172 | { }; | |
173 | ||
174 | /// is_reference | |
175 | template<typename _Tp> | |
176 | struct is_reference; | |
177 | ||
178 | /// is_function | |
179 | template<typename _Tp> | |
180 | struct is_function; | |
181 | ||
182 | template<typename> | |
183 | struct __is_member_object_pointer_helper | |
184 | : public false_type { }; | |
185 | _DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*, | |
186 | !is_function<_Tp>::value) | |
187 | ||
188 | /// is_member_object_pointer | |
189 | template<typename _Tp> | |
190 | struct is_member_object_pointer | |
191 | : public integral_constant<bool, (__is_member_object_pointer_helper< | |
192 | typename remove_cv<_Tp>::type>::value)> | |
193 | { }; | |
194 | ||
195 | template<typename> | |
196 | struct __is_member_function_pointer_helper | |
197 | : public false_type { }; | |
198 | _DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*, | |
199 | is_function<_Tp>::value) | |
200 | ||
201 | /// is_member_function_pointer | |
202 | template<typename _Tp> | |
203 | struct is_member_function_pointer | |
204 | : public integral_constant<bool, (__is_member_function_pointer_helper< | |
205 | typename remove_cv<_Tp>::type>::value)> | |
206 | { }; | |
207 | ||
208 | /// is_enum | |
209 | template<typename _Tp> | |
210 | struct is_enum | |
211 | : public integral_constant<bool, __is_enum(_Tp)> | |
212 | { }; | |
213 | ||
214 | /// is_union | |
215 | template<typename _Tp> | |
216 | struct is_union | |
217 | : public integral_constant<bool, __is_union(_Tp)> | |
218 | { }; | |
219 | ||
220 | /// is_class | |
221 | template<typename _Tp> | |
222 | struct is_class | |
223 | : public integral_constant<bool, __is_class(_Tp)> | |
224 | { }; | |
225 | ||
226 | /// is_function | |
227 | template<typename> | |
228 | struct is_function | |
229 | : public false_type { }; | |
230 | template<typename _Res, typename... _ArgTypes> | |
231 | struct is_function<_Res(_ArgTypes...)> | |
232 | : public true_type { }; | |
233 | template<typename _Res, typename... _ArgTypes> | |
234 | struct is_function<_Res(_ArgTypes......)> | |
235 | : public true_type { }; | |
236 | template<typename _Res, typename... _ArgTypes> | |
237 | struct is_function<_Res(_ArgTypes...) const> | |
238 | : public true_type { }; | |
239 | template<typename _Res, typename... _ArgTypes> | |
240 | struct is_function<_Res(_ArgTypes......) const> | |
241 | : public true_type { }; | |
242 | template<typename _Res, typename... _ArgTypes> | |
243 | struct is_function<_Res(_ArgTypes...) volatile> | |
244 | : public true_type { }; | |
245 | template<typename _Res, typename... _ArgTypes> | |
246 | struct is_function<_Res(_ArgTypes......) volatile> | |
247 | : public true_type { }; | |
248 | template<typename _Res, typename... _ArgTypes> | |
249 | struct is_function<_Res(_ArgTypes...) const volatile> | |
250 | : public true_type { }; | |
251 | template<typename _Res, typename... _ArgTypes> | |
252 | struct is_function<_Res(_ArgTypes......) const volatile> | |
253 | : public true_type { }; | |
254 | ||
255 | // composite type traits [4.5.2]. | |
256 | ||
257 | /// is_arithmetic | |
258 | template<typename _Tp> | |
259 | struct is_arithmetic | |
260 | : public integral_constant<bool, (is_integral<_Tp>::value | |
261 | || is_floating_point<_Tp>::value)> | |
262 | { }; | |
263 | ||
264 | /// is_fundamental | |
265 | template<typename _Tp> | |
266 | struct is_fundamental | |
267 | : public integral_constant<bool, (is_arithmetic<_Tp>::value | |
268 | || is_void<_Tp>::value)> | |
269 | { }; | |
270 | ||
271 | /// is_object | |
272 | template<typename _Tp> | |
273 | struct is_object | |
274 | : public integral_constant<bool, !(is_function<_Tp>::value | |
275 | || is_reference<_Tp>::value | |
276 | || is_void<_Tp>::value)> | |
277 | { }; | |
278 | ||
279 | /// is_member_pointer | |
280 | template<typename _Tp> | |
281 | struct is_member_pointer; | |
282 | ||
283 | /// is_scalar | |
284 | template<typename _Tp> | |
285 | struct is_scalar | |
286 | : public integral_constant<bool, (is_arithmetic<_Tp>::value | |
287 | || is_enum<_Tp>::value | |
288 | || is_pointer<_Tp>::value | |
289 | || is_member_pointer<_Tp>::value)> | |
290 | { }; | |
291 | ||
292 | /// is_compound | |
293 | template<typename _Tp> | |
294 | struct is_compound | |
295 | : public integral_constant<bool, !is_fundamental<_Tp>::value> { }; | |
296 | ||
297 | /// is_member_pointer | |
298 | template<typename _Tp> | |
299 | struct __is_member_pointer_helper | |
300 | : public false_type { }; | |
301 | _DEFINE_SPEC(2, __is_member_pointer_helper, _Tp _Cp::*, true) | |
302 | ||
303 | template<typename _Tp> | |
304 | struct is_member_pointer | |
305 | : public integral_constant<bool, (__is_member_pointer_helper< | |
306 | typename remove_cv<_Tp>::type>::value)> | |
307 | { }; | |
308 | ||
309 | // type properties [4.5.3]. | |
310 | /// is_const | |
311 | template<typename> | |
312 | struct is_const | |
313 | : public false_type { }; | |
314 | ||
315 | template<typename _Tp> | |
316 | struct is_const<_Tp const> | |
317 | : public true_type { }; | |
318 | ||
319 | /// is_volatile | |
320 | template<typename> | |
321 | struct is_volatile | |
322 | : public false_type { }; | |
323 | ||
324 | template<typename _Tp> | |
325 | struct is_volatile<_Tp volatile> | |
326 | : public true_type { }; | |
327 | ||
328 | /// is_empty | |
329 | template<typename _Tp> | |
330 | struct is_empty | |
331 | : public integral_constant<bool, __is_empty(_Tp)> | |
332 | { }; | |
333 | ||
334 | /// is_polymorphic | |
335 | template<typename _Tp> | |
336 | struct is_polymorphic | |
337 | : public integral_constant<bool, __is_polymorphic(_Tp)> | |
338 | { }; | |
339 | ||
340 | /// is_abstract | |
341 | template<typename _Tp> | |
342 | struct is_abstract | |
343 | : public integral_constant<bool, __is_abstract(_Tp)> | |
344 | { }; | |
345 | ||
346 | /// has_virtual_destructor | |
347 | template<typename _Tp> | |
348 | struct has_virtual_destructor | |
349 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> | |
350 | { }; | |
351 | ||
352 | /// alignment_of | |
353 | template<typename _Tp> | |
354 | struct alignment_of | |
355 | : public integral_constant<std::size_t, __alignof__(_Tp)> { }; | |
356 | ||
357 | /// rank | |
358 | template<typename> | |
359 | struct rank | |
360 | : public integral_constant<std::size_t, 0> { }; | |
361 | ||
362 | template<typename _Tp, std::size_t _Size> | |
363 | struct rank<_Tp[_Size]> | |
364 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
365 | ||
366 | template<typename _Tp> | |
367 | struct rank<_Tp[]> | |
368 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
369 | ||
370 | /// extent | |
371 | template<typename, unsigned _Uint = 0> | |
372 | struct extent | |
373 | : public integral_constant<std::size_t, 0> { }; | |
374 | ||
375 | template<typename _Tp, unsigned _Uint, std::size_t _Size> | |
376 | struct extent<_Tp[_Size], _Uint> | |
377 | : public integral_constant<std::size_t, | |
378 | _Uint == 0 ? _Size : extent<_Tp, | |
379 | _Uint - 1>::value> | |
380 | { }; | |
381 | ||
382 | template<typename _Tp, unsigned _Uint> | |
383 | struct extent<_Tp[], _Uint> | |
384 | : public integral_constant<std::size_t, | |
385 | _Uint == 0 ? 0 : extent<_Tp, | |
386 | _Uint - 1>::value> | |
387 | { }; | |
388 | ||
389 | // relationships between types [4.6]. | |
390 | ||
391 | /// is_same | |
392 | template<typename, typename> | |
393 | struct is_same | |
394 | : public false_type { }; | |
395 | ||
396 | template<typename _Tp> | |
397 | struct is_same<_Tp, _Tp> | |
3c279553 | 398 | : public true_type { }; |
51687431 | 399 | |
53dc5044 PC |
400 | // const-volatile modifications [4.7.1]. |
401 | ||
402 | /// remove_const | |
403 | template<typename _Tp> | |
404 | struct remove_const | |
405 | { typedef _Tp type; }; | |
406 | ||
407 | template<typename _Tp> | |
408 | struct remove_const<_Tp const> | |
409 | { typedef _Tp type; }; | |
410 | ||
411 | /// remove_volatile | |
412 | template<typename _Tp> | |
413 | struct remove_volatile | |
414 | { typedef _Tp type; }; | |
415 | ||
416 | template<typename _Tp> | |
417 | struct remove_volatile<_Tp volatile> | |
418 | { typedef _Tp type; }; | |
419 | ||
420 | /// remove_cv | |
421 | template<typename _Tp> | |
422 | struct remove_cv | |
423 | { | |
424 | typedef typename | |
425 | remove_const<typename remove_volatile<_Tp>::type>::type type; | |
426 | }; | |
427 | ||
428 | /// add_const | |
429 | template<typename _Tp> | |
430 | struct add_const | |
431 | { typedef _Tp const type; }; | |
432 | ||
433 | /// add_volatile | |
434 | template<typename _Tp> | |
435 | struct add_volatile | |
436 | { typedef _Tp volatile type; }; | |
437 | ||
438 | /// add_cv | |
439 | template<typename _Tp> | |
440 | struct add_cv | |
441 | { | |
442 | typedef typename | |
443 | add_const<typename add_volatile<_Tp>::type>::type type; | |
444 | }; | |
445 | ||
446 | // array modifications [4.7.3]. | |
447 | ||
448 | /// remove_extent | |
449 | template<typename _Tp> | |
450 | struct remove_extent | |
451 | { typedef _Tp type; }; | |
452 | ||
453 | template<typename _Tp, std::size_t _Size> | |
454 | struct remove_extent<_Tp[_Size]> | |
455 | { typedef _Tp type; }; | |
456 | ||
457 | template<typename _Tp> | |
458 | struct remove_extent<_Tp[]> | |
459 | { typedef _Tp type; }; | |
460 | ||
461 | /// remove_all_extents | |
462 | template<typename _Tp> | |
463 | struct remove_all_extents | |
464 | { typedef _Tp type; }; | |
465 | ||
466 | template<typename _Tp, std::size_t _Size> | |
467 | struct remove_all_extents<_Tp[_Size]> | |
468 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
469 | ||
470 | template<typename _Tp> | |
471 | struct remove_all_extents<_Tp[]> | |
472 | { typedef typename remove_all_extents<_Tp>::type type; }; | |
473 | ||
474 | // pointer modifications [4.7.4]. | |
475 | ||
476 | template<typename _Tp, typename> | |
477 | struct __remove_pointer_helper | |
478 | { typedef _Tp type; }; | |
479 | ||
480 | template<typename _Tp, typename _Up> | |
481 | struct __remove_pointer_helper<_Tp, _Up*> | |
482 | { typedef _Up type; }; | |
483 | ||
484 | /// remove_pointer | |
485 | template<typename _Tp> | |
486 | struct remove_pointer | |
487 | : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> | |
488 | { }; | |
489 | ||
490 | template<typename> | |
491 | struct remove_reference; | |
492 | ||
493 | /// add_pointer | |
494 | template<typename _Tp> | |
495 | struct add_pointer | |
496 | { typedef typename remove_reference<_Tp>::type* type; }; | |
497 | ||
493bc460 | 498 | template<typename> |
4a27a739 | 499 | struct is_reference |
0f910b4f PC |
500 | : public false_type { }; |
501 | ||
4a27a739 PC |
502 | template<typename _Tp> |
503 | struct is_reference<_Tp&> | |
504 | : public true_type { }; | |
493bc460 | 505 | |
1933b74f PC |
506 | template<typename _Tp> |
507 | struct is_pod | |
6a7508ec | 508 | : public integral_constant<bool, __is_pod(_Tp) || is_void<_Tp>::value> |
1933b74f PC |
509 | { }; |
510 | ||
511 | template<typename _Tp> | |
512 | struct has_trivial_constructor | |
e133ace8 PC |
513 | : public integral_constant<bool, is_pod<_Tp>::value> |
514 | { }; | |
1933b74f | 515 | |
36651afe PC |
516 | template<typename _Tp> |
517 | struct has_trivial_copy | |
e133ace8 PC |
518 | : public integral_constant<bool, is_pod<_Tp>::value> |
519 | { }; | |
36651afe PC |
520 | |
521 | template<typename _Tp> | |
522 | struct has_trivial_assign | |
e133ace8 PC |
523 | : public integral_constant<bool, is_pod<_Tp>::value> |
524 | { }; | |
36651afe | 525 | |
1933b74f PC |
526 | template<typename _Tp> |
527 | struct has_trivial_destructor | |
e133ace8 PC |
528 | : public integral_constant<bool, is_pod<_Tp>::value> |
529 | { }; | |
1933b74f | 530 | |
5249b4b0 PC |
531 | template<typename _Tp> |
532 | struct has_nothrow_constructor | |
e133ace8 PC |
533 | : public integral_constant<bool, is_pod<_Tp>::value> |
534 | { }; | |
5249b4b0 | 535 | |
36651afe PC |
536 | template<typename _Tp> |
537 | struct has_nothrow_copy | |
e133ace8 | 538 | : public integral_constant<bool, is_pod<_Tp>::value> |
22931aa4 | 539 | { }; |
464b277b PC |
540 | |
541 | template<typename _Tp> | |
e133ace8 PC |
542 | struct has_nothrow_assign |
543 | : public integral_constant<bool, is_pod<_Tp>::value> | |
973cb10b | 544 | { }; |
493bc460 | 545 | |
4a27a739 | 546 | template<typename> |
77d45108 | 547 | struct __is_signed_helper |
4a27a739 | 548 | : public false_type { }; |
53dc5044 PC |
549 | _DEFINE_SPEC(0, __is_signed_helper, signed char, true) |
550 | _DEFINE_SPEC(0, __is_signed_helper, short, true) | |
551 | _DEFINE_SPEC(0, __is_signed_helper, int, true) | |
552 | _DEFINE_SPEC(0, __is_signed_helper, long, true) | |
553 | _DEFINE_SPEC(0, __is_signed_helper, long long, true) | |
77d45108 PC |
554 | |
555 | template<typename _Tp> | |
556 | struct is_signed | |
557 | : public integral_constant<bool, (__is_signed_helper<typename | |
558 | remove_cv<_Tp>::type>::value)> | |
559 | { }; | |
4a27a739 PC |
560 | |
561 | template<typename> | |
77d45108 | 562 | struct __is_unsigned_helper |
4a27a739 | 563 | : public false_type { }; |
53dc5044 PC |
564 | _DEFINE_SPEC(0, __is_unsigned_helper, unsigned char, true) |
565 | _DEFINE_SPEC(0, __is_unsigned_helper, unsigned short, true) | |
566 | _DEFINE_SPEC(0, __is_unsigned_helper, unsigned int, true) | |
567 | _DEFINE_SPEC(0, __is_unsigned_helper, unsigned long, true) | |
568 | _DEFINE_SPEC(0, __is_unsigned_helper, unsigned long long, true) | |
77d45108 PC |
569 | |
570 | template<typename _Tp> | |
571 | struct is_unsigned | |
572 | : public integral_constant<bool, (__is_unsigned_helper<typename | |
573 | remove_cv<_Tp>::type>::value)> | |
574 | { }; | |
4a27a739 | 575 | |
22931aa4 | 576 | template<typename _Base, typename _Derived> |
f4e4284d | 577 | struct __is_base_of_helper |
f4e4284d | 578 | { |
22931aa4 PC |
579 | typedef typename remove_cv<_Base>::type _NoCv_Base; |
580 | typedef typename remove_cv<_Derived>::type _NoCv_Derived; | |
581 | static const bool __value = (is_same<_Base, _Derived>::value | |
582 | || (__is_base_of(_Base, _Derived) | |
583 | && !is_same<_NoCv_Base, | |
584 | _NoCv_Derived>::value)); | |
f4e4284d | 585 | }; |
22931aa4 | 586 | |
f4e4284d PC |
587 | template<typename _Base, typename _Derived> |
588 | struct is_base_of | |
589 | : public integral_constant<bool, | |
590 | __is_base_of_helper<_Base, _Derived>::__value> | |
591 | { }; | |
592 | ||
516ebd44 PC |
593 | template<typename _From, typename _To> |
594 | struct __is_convertible_simple | |
595 | : public __sfinae_types | |
596 | { | |
597 | private: | |
598 | static __one __test(_To); | |
599 | static __two __test(...); | |
600 | static _From __makeFrom(); | |
601 | ||
602 | public: | |
603 | static const bool __value = sizeof(__test(__makeFrom())) == 1; | |
604 | }; | |
605 | ||
beb1b475 PC |
606 | template<typename _Tp> |
607 | struct add_reference; | |
608 | ||
c150a271 PC |
609 | template<typename _Tp> |
610 | struct __is_int_or_cref | |
611 | { | |
612 | typedef typename remove_reference<_Tp>::type __rr_Tp; | |
613 | static const bool __value = (is_integral<_Tp>::value | |
614 | || (is_integral<__rr_Tp>::value | |
615 | && is_const<__rr_Tp>::value | |
616 | && !is_volatile<__rr_Tp>::value)); | |
617 | }; | |
618 | ||
619 | template<typename _From, typename _To, | |
152d9676 PC |
620 | bool = (is_void<_From>::value || is_void<_To>::value |
621 | || is_function<_To>::value || is_array<_To>::value | |
939759fc | 622 | // This special case is here only to avoid warnings. |
c150a271 PC |
623 | || (is_floating_point<typename |
624 | remove_reference<_From>::type>::value | |
625 | && __is_int_or_cref<_To>::__value))> | |
626 | struct __is_convertible_helper | |
627 | { | |
628 | // "An imaginary lvalue of type From...". | |
516ebd44 | 629 | static const bool __value = (__is_convertible_simple<typename |
c150a271 PC |
630 | add_reference<_From>::type, _To>::__value); |
631 | }; | |
632 | ||
633 | template<typename _From, typename _To> | |
634 | struct __is_convertible_helper<_From, _To, true> | |
152d9676 PC |
635 | { static const bool __value = (is_void<_To>::value |
636 | || (__is_int_or_cref<_To>::__value | |
637 | && !is_void<_From>::value)); }; | |
c150a271 PC |
638 | |
639 | template<typename _From, typename _To> | |
640 | struct is_convertible | |
641 | : public integral_constant<bool, | |
642 | __is_convertible_helper<_From, _To>::__value> | |
643 | { }; | |
644 | ||
939759fc | 645 | // reference modifications [4.7.2]. |
4a27a739 PC |
646 | template<typename _Tp> |
647 | struct remove_reference | |
648 | { typedef _Tp type; }; | |
649 | ||
650 | template<typename _Tp> | |
651 | struct remove_reference<_Tp&> | |
652 | { typedef _Tp type; }; | |
653 | ||
654 | // NB: Careful with reference to void. | |
655 | template<typename _Tp, bool = (is_void<_Tp>::value | |
656 | || is_reference<_Tp>::value)> | |
657 | struct __add_reference_helper | |
658 | { typedef _Tp& type; }; | |
659 | ||
660 | template<typename _Tp> | |
661 | struct __add_reference_helper<_Tp, true> | |
662 | { typedef _Tp type; }; | |
663 | ||
664 | template<typename _Tp> | |
665 | struct add_reference | |
666 | : public __add_reference_helper<_Tp> | |
667 | { }; | |
668 | ||
939759fc | 669 | // other transformations [4.8]. |
fd735b6a PC |
670 | template<std::size_t _Len, std::size_t _Align> |
671 | struct aligned_storage | |
672 | { | |
673 | union type | |
674 | { | |
675 | unsigned char __data[_Len]; | |
676 | struct __attribute__((__aligned__((_Align)))) { } __align; | |
677 | }; | |
678 | }; | |
679 | ||
53dc5044 PC |
680 | #undef _DEFINE_SPEC_0_HELPER |
681 | #undef _DEFINE_SPEC_1_HELPER | |
682 | #undef _DEFINE_SPEC_2_HELPER | |
e2f5c678 | 683 | #undef _DEFINE_SPEC |
12ffa228 BK |
684 | |
685 | _GLIBCXX_END_NAMESPACE_VERSION | |
e133ace8 | 686 | } |
493bc460 PC |
687 | } |
688 | ||
e133ace8 | 689 | #endif // _GLIBCXX_TR1_TYPE_TRAITS |