-
Notifications
You must be signed in to change notification settings - Fork 58
/
functional
2574 lines (2203 loc) · 78.9 KB
/
functional
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// <functional> -*- C++ -*-
// Copyright (C) 2001-2013 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/*
* Copyright (c) 1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*/
/** @file include/functional
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_FUNCTIONAL
#define _GLIBCXX_FUNCTIONAL 1
#pragma GCC system_header
#include <bits/c++config.h>
#include <bits/stl_function.h>
#if __cplusplus >= 201103L
#include <typeinfo>
#include <new>
#include <tuple>
#include <type_traits>
#include <bits/functexcept.h>
#include <bits/functional_hash.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _MemberPointer>
class _Mem_fn;
template<typename _Tp, typename _Class>
_Mem_fn<_Tp _Class::*>
mem_fn(_Tp _Class::*) noexcept;
_GLIBCXX_HAS_NESTED_TYPE(result_type)
/// If we have found a result_type, extract it.
template<bool _Has_result_type, typename _Functor>
struct _Maybe_get_result_type
{ };
template<typename _Functor>
struct _Maybe_get_result_type<true, _Functor>
{ typedef typename _Functor::result_type result_type; };
/**
* Base class for any function object that has a weak result type, as
* defined in 3.3/3 of TR1.
*/
template<typename _Functor>
struct _Weak_result_type_impl
: _Maybe_get_result_type<__has_result_type<_Functor>::value, _Functor>
{ };
/// Retrieve the result type for a function type.
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes...)>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes......)>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes...) const>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes......) const>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile>
{ typedef _Res result_type; };
/// Retrieve the result type for a function reference.
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)>
{ typedef _Res result_type; };
/// Retrieve the result type for a function pointer.
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)>
{ typedef _Res result_type; };
/// Retrieve result type for a member function pointer.
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>
{ typedef _Res result_type; };
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)>
{ typedef _Res result_type; };
/// Retrieve result type for a const member function pointer.
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>
{ typedef _Res result_type; };
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const>
{ typedef _Res result_type; };
/// Retrieve result type for a volatile member function pointer.
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>
{ typedef _Res result_type; };
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile>
{ typedef _Res result_type; };
/// Retrieve result type for a const volatile member function pointer.
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)
const volatile>
{ typedef _Res result_type; };
template<typename _Res, typename _Class, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)
const volatile>
{ typedef _Res result_type; };
/**
* Strip top-level cv-qualifiers from the function object and let
* _Weak_result_type_impl perform the real work.
*/
template<typename _Functor>
struct _Weak_result_type
: _Weak_result_type_impl<typename remove_cv<_Functor>::type>
{ };
/// Determines if the type _Tp derives from unary_function.
template<typename _Tp>
struct _Derives_from_unary_function : __sfinae_types
{
private:
template<typename _T1, typename _Res>
static __one __test(const volatile unary_function<_T1, _Res>*);
// It's tempting to change "..." to const volatile void*, but
// that fails when _Tp is a function type.
static __two __test(...);
public:
static const bool value = sizeof(__test((_Tp*)0)) == 1;
};
/// Determines if the type _Tp derives from binary_function.
template<typename _Tp>
struct _Derives_from_binary_function : __sfinae_types
{
private:
template<typename _T1, typename _T2, typename _Res>
static __one __test(const volatile binary_function<_T1, _T2, _Res>*);
// It's tempting to change "..." to const volatile void*, but
// that fails when _Tp is a function type.
static __two __test(...);
public:
static const bool value = sizeof(__test((_Tp*)0)) == 1;
};
/**
* Invoke a function object, which may be either a member pointer or a
* function object. The first parameter will tell which.
*/
template<typename _Functor, typename... _Args>
inline
typename enable_if<
(!is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function<typename remove_pointer<_Functor>::type>::value),
typename result_of<_Functor&(_Args&&...)>::type
>::type
__invoke(_Functor& __f, _Args&&... __args)
{
return __f(std::forward<_Args>(__args)...);
}
template<typename _Functor, typename... _Args>
inline
typename enable_if<
(is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function<typename remove_pointer<_Functor>::type>::value),
typename result_of<_Functor(_Args&&...)>::type
>::type
__invoke(_Functor& __f, _Args&&... __args)
{
return std::mem_fn(__f)(std::forward<_Args>(__args)...);
}
// To pick up function references (that will become function pointers)
template<typename _Functor, typename... _Args>
inline
typename enable_if<
(is_pointer<_Functor>::value
&& is_function<typename remove_pointer<_Functor>::type>::value),
typename result_of<_Functor(_Args&&...)>::type
>::type
__invoke(_Functor __f, _Args&&... __args)
{
return __f(std::forward<_Args>(__args)...);
}
/**
* Knowing which of unary_function and binary_function _Tp derives
* from, derives from the same and ensures that reference_wrapper
* will have a weak result type. See cases below.
*/
template<bool _Unary, bool _Binary, typename _Tp>
struct _Reference_wrapper_base_impl;
// None of the nested argument types.
template<typename _Tp>
struct _Reference_wrapper_base_impl<false, false, _Tp>
: _Weak_result_type<_Tp>
{ };
// Nested argument_type only.
template<typename _Tp>
struct _Reference_wrapper_base_impl<true, false, _Tp>
: _Weak_result_type<_Tp>
{
typedef typename _Tp::argument_type argument_type;
};
// Nested first_argument_type and second_argument_type only.
template<typename _Tp>
struct _Reference_wrapper_base_impl<false, true, _Tp>
: _Weak_result_type<_Tp>
{
typedef typename _Tp::first_argument_type first_argument_type;
typedef typename _Tp::second_argument_type second_argument_type;
};
// All the nested argument types.
template<typename _Tp>
struct _Reference_wrapper_base_impl<true, true, _Tp>
: _Weak_result_type<_Tp>
{
typedef typename _Tp::argument_type argument_type;
typedef typename _Tp::first_argument_type first_argument_type;
typedef typename _Tp::second_argument_type second_argument_type;
};
_GLIBCXX_HAS_NESTED_TYPE(argument_type)
_GLIBCXX_HAS_NESTED_TYPE(first_argument_type)
_GLIBCXX_HAS_NESTED_TYPE(second_argument_type)
/**
* Derives from unary_function or binary_function when it
* can. Specializations handle all of the easy cases. The primary
* template determines what to do with a class type, which may
* derive from both unary_function and binary_function.
*/
template<typename _Tp>
struct _Reference_wrapper_base
: _Reference_wrapper_base_impl<
__has_argument_type<_Tp>::value,
__has_first_argument_type<_Tp>::value
&& __has_second_argument_type<_Tp>::value,
_Tp>
{ };
// - a function type (unary)
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res(_T1)>
: unary_function<_T1, _Res>
{ };
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res(_T1) const>
: unary_function<_T1, _Res>
{ };
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res(_T1) volatile>
: unary_function<_T1, _Res>
{ };
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res(_T1) const volatile>
: unary_function<_T1, _Res>
{ };
// - a function type (binary)
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res(_T1, _T2)>
: binary_function<_T1, _T2, _Res>
{ };
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res(_T1, _T2) const>
: binary_function<_T1, _T2, _Res>
{ };
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res(_T1, _T2) volatile>
: binary_function<_T1, _T2, _Res>
{ };
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile>
: binary_function<_T1, _T2, _Res>
{ };
// - a function pointer type (unary)
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res(*)(_T1)>
: unary_function<_T1, _Res>
{ };
// - a function pointer type (binary)
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>
: binary_function<_T1, _T2, _Res>
{ };
// - a pointer to member function type (unary, no qualifiers)
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res (_T1::*)()>
: unary_function<_T1*, _Res>
{ };
// - a pointer to member function type (binary, no qualifiers)
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>
: binary_function<_T1*, _T2, _Res>
{ };
// - a pointer to member function type (unary, const)
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res (_T1::*)() const>
: unary_function<const _T1*, _Res>
{ };
// - a pointer to member function type (binary, const)
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>
: binary_function<const _T1*, _T2, _Res>
{ };
// - a pointer to member function type (unary, volatile)
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res (_T1::*)() volatile>
: unary_function<volatile _T1*, _Res>
{ };
// - a pointer to member function type (binary, volatile)
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>
: binary_function<volatile _T1*, _T2, _Res>
{ };
// - a pointer to member function type (unary, const volatile)
template<typename _Res, typename _T1>
struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>
: unary_function<const volatile _T1*, _Res>
{ };
// - a pointer to member function type (binary, const volatile)
template<typename _Res, typename _T1, typename _T2>
struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>
: binary_function<const volatile _T1*, _T2, _Res>
{ };
/**
* @brief Primary class template for reference_wrapper.
* @ingroup functors
* @{
*/
template<typename _Tp>
class reference_wrapper
: public _Reference_wrapper_base<typename remove_cv<_Tp>::type>
{
_Tp* _M_data;
public:
typedef _Tp type;
reference_wrapper(_Tp& __indata) noexcept
: _M_data(std::__addressof(__indata))
{ }
reference_wrapper(_Tp&&) = delete;
reference_wrapper(const reference_wrapper<_Tp>& __inref) noexcept
: _M_data(__inref._M_data)
{ }
reference_wrapper&
operator=(const reference_wrapper<_Tp>& __inref) noexcept
{
_M_data = __inref._M_data;
return *this;
}
operator _Tp&() const noexcept
{ return this->get(); }
_Tp&
get() const noexcept
{ return *_M_data; }
template<typename... _Args>
typename result_of<_Tp&(_Args&&...)>::type
operator()(_Args&&... __args) const
{
return __invoke(get(), std::forward<_Args>(__args)...);
}
};
/// Denotes a reference should be taken to a variable.
template<typename _Tp>
inline reference_wrapper<_Tp>
ref(_Tp& __t) noexcept
{ return reference_wrapper<_Tp>(__t); }
/// Denotes a const reference should be taken to a variable.
template<typename _Tp>
inline reference_wrapper<const _Tp>
cref(const _Tp& __t) noexcept
{ return reference_wrapper<const _Tp>(__t); }
template<typename _Tp>
void ref(const _Tp&&) = delete;
template<typename _Tp>
void cref(const _Tp&&) = delete;
/// Partial specialization.
template<typename _Tp>
inline reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) noexcept
{ return ref(__t.get()); }
/// Partial specialization.
template<typename _Tp>
inline reference_wrapper<const _Tp>
cref(reference_wrapper<_Tp> __t) noexcept
{ return cref(__t.get()); }
// @} group functors
template<typename... _Types>
struct _Pack : integral_constant<size_t, sizeof...(_Types)>
{ };
template<typename _From, typename _To, bool = _From::value == _To::value>
struct _AllConvertible : false_type
{ };
template<typename... _From, typename... _To>
struct _AllConvertible<_Pack<_From...>, _Pack<_To...>, true>
: __and_<is_convertible<_From, _To>...>
{ };
template<typename _Tp1, typename _Tp2>
using _NotSame = __not_<is_same<typename std::decay<_Tp1>::type,
typename std::decay<_Tp2>::type>>;
/**
* Derives from @c unary_function or @c binary_function, or perhaps
* nothing, depending on the number of arguments provided. The
* primary template is the basis case, which derives nothing.
*/
template<typename _Res, typename... _ArgTypes>
struct _Maybe_unary_or_binary_function { };
/// Derives from @c unary_function, as appropriate.
template<typename _Res, typename _T1>
struct _Maybe_unary_or_binary_function<_Res, _T1>
: std::unary_function<_T1, _Res> { };
/// Derives from @c binary_function, as appropriate.
template<typename _Res, typename _T1, typename _T2>
struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
: std::binary_function<_T1, _T2, _Res> { };
/// Implementation of @c mem_fn for member function pointers.
template<typename _Res, typename _Class, typename... _ArgTypes>
class _Mem_fn<_Res (_Class::*)(_ArgTypes...)>
: public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...);
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
// Require each _Args to be convertible to corresponding _ArgTypes
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
// Require each _Args to be convertible to corresponding _ArgTypes
// and require _Tp is not _Class, _Class& or _Class*
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
// Require each _Args to be convertible to corresponding _ArgTypes
// and require _Tp is _Class or derived from _Class
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(_Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(_Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(_Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res
operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
/// Implementation of @c mem_fn for const member function pointers.
template<typename _Res, typename _Class, typename... _ArgTypes>
class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const>
: public _Maybe_unary_or_binary_function<_Res, const _Class*,
_ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...) const;
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<const _Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(const _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(const _Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(const _Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
/// Implementation of @c mem_fn for volatile member function pointers.
template<typename _Res, typename _Class, typename... _ArgTypes>
class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile>
: public _Maybe_unary_or_binary_function<_Res, volatile _Class*,
_ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile;
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<volatile _Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(volatile _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(volatile _Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(volatile _Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res
operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
/// Implementation of @c mem_fn for const volatile member function pointers.
template<typename _Res, typename _Class, typename... _ArgTypes>
class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile>
: public _Maybe_unary_or_binary_function<_Res, const volatile _Class*,
_ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile;
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args>
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>,
_NotSame<const volatile _Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(const volatile _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(const volatile _Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(const volatile _Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
template<typename _Tp, bool>
struct _Mem_fn_const_or_non
{
typedef const _Tp& type;
};
template<typename _Tp>
struct _Mem_fn_const_or_non<_Tp, false>
{
typedef _Tp& type;
};
template<typename _Res, typename _Class>
class _Mem_fn<_Res _Class::*>
{
using __pm_type = _Res _Class::*;
// This bit of genius is due to Peter Dimov, improved slightly by
// Douglas Gregor.
// Made less elegant to support perfect forwarding and noexcept.
template<typename _Tp>
auto
_M_call(_Tp&& __object, const _Class *) const noexcept
-> decltype(std::forward<_Tp>(__object).*std::declval<__pm_type&>())
{ return std::forward<_Tp>(__object).*__pm; }
template<typename _Tp, typename _Up>
auto
_M_call(_Tp&& __object, _Up * const *) const noexcept
-> decltype((*std::forward<_Tp>(__object)).*std::declval<__pm_type&>())
{ return (*std::forward<_Tp>(__object)).*__pm; }
template<typename _Tp>
auto
_M_call(_Tp&& __ptr, const volatile void*) const
noexcept(noexcept((*__ptr).*std::declval<__pm_type&>()))
-> decltype((*__ptr).*std::declval<__pm_type&>())
{ return (*__ptr).*__pm; }
public:
explicit
_Mem_fn(_Res _Class::*__pm) noexcept : __pm(__pm) { }
// Handle objects
_Res&
operator()(_Class& __object) const noexcept
{ return __object.*__pm; }
const _Res&
operator()(const _Class& __object) const noexcept
{ return __object.*__pm; }
_Res&&
operator()(_Class&& __object) const noexcept
{ return std::forward<_Class>(__object).*__pm; }
const _Res&&
operator()(const _Class&& __object) const noexcept
{ return std::forward<const _Class>(__object).*__pm; }
// Handle pointers
_Res&
operator()(_Class* __object) const noexcept
{ return __object->*__pm; }
const _Res&
operator()(const _Class* __object) const noexcept
{ return __object->*__pm; }
// Handle smart pointers and derived
template<typename _Tp, typename _Req = _Require<_NotSame<_Class*, _Tp>>>
auto
operator()(_Tp&& __unknown) const
noexcept(noexcept(std::declval<_Mem_fn*>()->_M_call
(std::forward<_Tp>(__unknown), &__unknown)))
-> decltype(this->_M_call(std::forward<_Tp>(__unknown), &__unknown))
{ return _M_call(std::forward<_Tp>(__unknown), &__unknown); }
template<typename _Tp, typename _Req = _Require<is_base_of<_Class, _Tp>>>
auto
operator()(reference_wrapper<_Tp> __ref) const
noexcept(noexcept(std::declval<_Mem_fn&>()(__ref.get())))
-> decltype((*this)(__ref.get()))
{ return (*this)(__ref.get()); }
private:
_Res _Class::*__pm;
};
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2048. Unnecessary mem_fn overloads
/**
* @brief Returns a function object that forwards to the member
* pointer @a pm.
* @ingroup functors
*/
template<typename _Tp, typename _Class>
inline _Mem_fn<_Tp _Class::*>
mem_fn(_Tp _Class::* __pm) noexcept
{
return _Mem_fn<_Tp _Class::*>(__pm);
}
/**
* @brief Determines if the given type _Tp is a function object
* should be treated as a subexpression when evaluating calls to
* function objects returned by bind(). [TR1 3.6.1]
* @ingroup binders
*/
template<typename _Tp>
struct is_bind_expression
: public false_type { };
/**
* @brief Determines if the given type _Tp is a placeholder in a
* bind() expression and, if so, which placeholder it is. [TR1 3.6.2]
* @ingroup binders
*/
template<typename _Tp>
struct is_placeholder
: public integral_constant<int, 0>
{ };
/** @brief The type of placeholder objects defined by libstdc++.
* @ingroup binders
*/
template<int _Num> struct _Placeholder { };
_GLIBCXX_END_NAMESPACE_VERSION
/** @namespace std::placeholders
* @brief ISO C++11 entities sub-namespace for functional.
* @ingroup binders
*/
namespace placeholders
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/* Define a large number of placeholders. There is no way to