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
|
// <chrono> -*- C++ -*-
// Copyright (C) 2008-2014 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/>.
/** @file include/chrono
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_CHRONO
#define _GLIBCXX_CHRONO 1
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <ratio>
#include <type_traits>
#include <limits>
#include <ctime>
#include <bits/parse_numbers.h> // for literals support.
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
namespace std _GLIBCXX_VISIBILITY(default)
{
/**
* @defgroup chrono Time
* @ingroup utilities
*
* Classes and functions for time.
* @{
*/
/** @namespace std::chrono
* @brief ISO C++ 2011 entities sub-namespace for time and date.
*/
namespace chrono
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Rep, typename _Period = ratio<1>>
struct duration;
template<typename _Clock, typename _Dur = typename _Clock::duration>
struct time_point;
_GLIBCXX_END_NAMESPACE_VERSION
}
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
template<typename _CT, typename _Period1, typename _Period2>
struct __duration_common_type_wrapper
{
private:
typedef __static_gcd<_Period1::num, _Period2::num> __gcd_num;
typedef __static_gcd<_Period1::den, _Period2::den> __gcd_den;
typedef typename _CT::type __cr;
typedef ratio<__gcd_num::value,
(_Period1::den / __gcd_den::value) * _Period2::den> __r;
public:
typedef __success_type<chrono::duration<__cr, __r>> type;
};
template<typename _Period1, typename _Period2>
struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2>
{ typedef __failure_type type; };
template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
struct common_type<chrono::duration<_Rep1, _Period1>,
chrono::duration<_Rep2, _Period2>>
: public __duration_common_type_wrapper<typename __member_type_wrapper<
common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type
{ };
// 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
template<typename _CT, typename _Clock>
struct __timepoint_common_type_wrapper
{
typedef __success_type<chrono::time_point<_Clock, typename _CT::type>>
type;
};
template<typename _Clock>
struct __timepoint_common_type_wrapper<__failure_type, _Clock>
{ typedef __failure_type type; };
template<typename _Clock, typename _Duration1, typename _Duration2>
struct common_type<chrono::time_point<_Clock, _Duration1>,
chrono::time_point<_Clock, _Duration2>>
: public __timepoint_common_type_wrapper<typename __member_type_wrapper<
common_type<_Duration1, _Duration2>>::type, _Clock>::type
{ };
_GLIBCXX_END_NAMESPACE_VERSION
namespace chrono
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// Primary template for duration_cast impl.
template<typename _ToDur, typename _CF, typename _CR,
bool _NumIsOne = false, bool _DenIsOne = false>
struct __duration_cast_impl
{
template<typename _Rep, typename _Period>
static constexpr _ToDur
__cast(const duration<_Rep, _Period>& __d)
{
typedef typename _ToDur::rep __to_rep;
return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
* static_cast<_CR>(_CF::num)
/ static_cast<_CR>(_CF::den)));
}
};
template<typename _ToDur, typename _CF, typename _CR>
struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
{
template<typename _Rep, typename _Period>
static constexpr _ToDur
__cast(const duration<_Rep, _Period>& __d)
{
typedef typename _ToDur::rep __to_rep;
return _ToDur(static_cast<__to_rep>(__d.count()));
}
};
template<typename _ToDur, typename _CF, typename _CR>
struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
{
template<typename _Rep, typename _Period>
static constexpr _ToDur
__cast(const duration<_Rep, _Period>& __d)
{
typedef typename _ToDur::rep __to_rep;
return _ToDur(static_cast<__to_rep>(
static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
}
};
template<typename _ToDur, typename _CF, typename _CR>
struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
{
template<typename _Rep, typename _Period>
static constexpr _ToDur
__cast(const duration<_Rep, _Period>& __d)
{
typedef typename _ToDur::rep __to_rep;
return _ToDur(static_cast<__to_rep>(
static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
}
};
template<typename _Tp>
struct __is_duration
: std::false_type
{ };
template<typename _Rep, typename _Period>
struct __is_duration<duration<_Rep, _Period>>
: std::true_type
{ };
/// duration_cast
template<typename _ToDur, typename _Rep, typename _Period>
constexpr typename enable_if<__is_duration<_ToDur>::value,
_ToDur>::type
duration_cast(const duration<_Rep, _Period>& __d)
{
typedef typename _ToDur::period __to_period;
typedef typename _ToDur::rep __to_rep;
typedef ratio_divide<_Period, __to_period> __cf;
typedef typename common_type<__to_rep, _Rep, intmax_t>::type
__cr;
typedef __duration_cast_impl<_ToDur, __cf, __cr,
__cf::num == 1, __cf::den == 1> __dc;
return __dc::__cast(__d);
}
/// treat_as_floating_point
template<typename _Rep>
struct treat_as_floating_point
: is_floating_point<_Rep>
{ };
/// duration_values
template<typename _Rep>
struct duration_values
{
static constexpr _Rep
zero()
{ return _Rep(0); }
static constexpr _Rep
max()
{ return numeric_limits<_Rep>::max(); }
static constexpr _Rep
min()
{ return numeric_limits<_Rep>::lowest(); }
};
template<typename _Tp>
struct __is_ratio
: std::false_type
{ };
template<intmax_t _Num, intmax_t _Den>
struct __is_ratio<ratio<_Num, _Den>>
: std::true_type
{ };
/// duration
template<typename _Rep, typename _Period>
struct duration
{
typedef _Rep rep;
typedef _Period period;
static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
static_assert(__is_ratio<_Period>::value,
"period must be a specialization of ratio");
static_assert(_Period::num > 0, "period must be positive");
// 20.11.5.1 construction / copy / destroy
constexpr duration() = default;
// NB: Make constexpr implicit. This cannot be explicitly
// constexpr, as any UDT that is not a literal type with a
// constexpr copy constructor will be ill-formed.
duration(const duration&) = default;
template<typename _Rep2, typename = typename
enable_if<is_convertible<_Rep2, rep>::value
&& (treat_as_floating_point<rep>::value
|| !treat_as_floating_point<_Rep2>::value)>::type>
constexpr explicit duration(const _Rep2& __rep)
: __r(static_cast<rep>(__rep)) { }
template<typename _Rep2, typename _Period2, typename = typename
enable_if<treat_as_floating_point<rep>::value
|| (ratio_divide<_Period2, period>::den == 1
&& !treat_as_floating_point<_Rep2>::value)>::type>
constexpr duration(const duration<_Rep2, _Period2>& __d)
: __r(duration_cast<duration>(__d).count()) { }
~duration() = default;
duration& operator=(const duration&) = default;
// 20.11.5.2 observer
constexpr rep
count() const
{ return __r; }
// 20.11.5.3 arithmetic
constexpr duration
operator+() const
{ return *this; }
constexpr duration
operator-() const
{ return duration(-__r); }
duration&
operator++()
{
++__r;
return *this;
}
duration
operator++(int)
{ return duration(__r++); }
duration&
operator--()
{
--__r;
return *this;
}
duration
operator--(int)
{ return duration(__r--); }
duration&
operator+=(const duration& __d)
{
__r += __d.count();
return *this;
}
duration&
operator-=(const duration& __d)
{
__r -= __d.count();
return *this;
}
duration&
operator*=(const rep& __rhs)
{
__r *= __rhs;
return *this;
}
duration&
operator/=(const rep& __rhs)
{
__r /= __rhs;
return *this;
}
// DR 934.
template<typename _Rep2 = rep>
typename enable_if<!treat_as_floating_point<_Rep2>::value,
duration&>::type
operator%=(const rep& __rhs)
{
__r %= __rhs;
return *this;
}
template<typename _Rep2 = rep>
typename enable_if<!treat_as_floating_point<_Rep2>::value,
duration&>::type
operator%=(const duration& __d)
{
__r %= __d.count();
return *this;
}
// 20.11.5.4 special values
static constexpr duration
zero()
{ return duration(duration_values<rep>::zero()); }
static constexpr duration
min()
{ return duration(duration_values<rep>::min()); }
static constexpr duration
max()
{ return duration(duration_values<rep>::max()); }
private:
rep __r;
};
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type
operator+(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<__dur1,__dur2>::type __cd;
return __cd(__cd(__lhs).count() + __cd(__rhs).count());
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type
operator-(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<__dur1,__dur2>::type __cd;
return __cd(__cd(__lhs).count() - __cd(__rhs).count());
}
template<typename _Rep1, typename _Rep2, bool =
is_convertible<_Rep2,
typename common_type<_Rep1, _Rep2>::type>::value>
struct __common_rep_type { };
template<typename _Rep1, typename _Rep2>
struct __common_rep_type<_Rep1, _Rep2, true>
{ typedef typename common_type<_Rep1, _Rep2>::type type; };
template<typename _Rep1, typename _Period, typename _Rep2>
constexpr
duration<typename __common_rep_type<_Rep1, _Rep2>::type, _Period>
operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
{
typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
__cd;
return __cd(__cd(__d).count() * __s);
}
template<typename _Rep1, typename _Rep2, typename _Period>
constexpr
duration<typename __common_rep_type<_Rep2, _Rep1>::type, _Period>
operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
{ return __d * __s; }
template<typename _Rep1, typename _Period, typename _Rep2>
constexpr duration<typename __common_rep_type<_Rep1, typename
enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
{
typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
__cd;
return __cd(__cd(__d).count() / __s);
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr typename common_type<_Rep1, _Rep2>::type
operator/(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<__dur1,__dur2>::type __cd;
return __cd(__lhs).count() / __cd(__rhs).count();
}
// DR 934.
template<typename _Rep1, typename _Period, typename _Rep2>
constexpr duration<typename __common_rep_type<_Rep1, typename
enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
{
typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
__cd;
return __cd(__cd(__d).count() % __s);
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr typename common_type<duration<_Rep1, _Period1>,
duration<_Rep2, _Period2>>::type
operator%(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<__dur1,__dur2>::type __cd;
return __cd(__cd(__lhs).count() % __cd(__rhs).count());
}
// comparisons
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr bool
operator==(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<__dur1,__dur2>::type __ct;
return __ct(__lhs).count() == __ct(__rhs).count();
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr bool
operator<(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<__dur1,__dur2>::type __ct;
return __ct(__lhs).count() < __ct(__rhs).count();
}
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr bool
operator!=(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return !(__lhs == __rhs); }
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr bool
operator<=(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return !(__rhs < __lhs); }
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr bool
operator>(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return __rhs < __lhs; }
template<typename _Rep1, typename _Period1,
typename _Rep2, typename _Period2>
constexpr bool
operator>=(const duration<_Rep1, _Period1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{ return !(__lhs < __rhs); }
/// nanoseconds
typedef duration<int64_t, nano> nanoseconds;
/// microseconds
typedef duration<int64_t, micro> microseconds;
/// milliseconds
typedef duration<int64_t, milli> milliseconds;
/// seconds
typedef duration<int64_t> seconds;
/// minutes
typedef duration<int64_t, ratio< 60>> minutes;
/// hours
typedef duration<int64_t, ratio<3600>> hours;
/// time_point
template<typename _Clock, typename _Dur>
struct time_point
{
typedef _Clock clock;
typedef _Dur duration;
typedef typename duration::rep rep;
typedef typename duration::period period;
constexpr time_point() : __d(duration::zero())
{ }
constexpr explicit time_point(const duration& __dur)
: __d(__dur)
{ }
// conversions
template<typename _Dur2>
constexpr time_point(const time_point<clock, _Dur2>& __t)
: __d(__t.time_since_epoch())
{ }
// observer
constexpr duration
time_since_epoch() const
{ return __d; }
// arithmetic
time_point&
operator+=(const duration& __dur)
{
__d += __dur;
return *this;
}
time_point&
operator-=(const duration& __dur)
{
__d -= __dur;
return *this;
}
// special values
static constexpr time_point
min()
{ return time_point(duration::min()); }
static constexpr time_point
max()
{ return time_point(duration::max()); }
private:
duration __d;
};
/// time_point_cast
template<typename _ToDur, typename _Clock, typename _Dur>
constexpr typename enable_if<__is_duration<_ToDur>::value,
time_point<_Clock, _ToDur>>::type
time_point_cast(const time_point<_Clock, _Dur>& __t)
{
typedef time_point<_Clock, _ToDur> __time_point;
return __time_point(duration_cast<_ToDur>(__t.time_since_epoch()));
}
template<typename _Clock, typename _Dur1,
typename _Rep2, typename _Period2>
constexpr time_point<_Clock,
typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
operator+(const time_point<_Clock, _Dur1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<_Dur1,__dur2>::type __ct;
typedef time_point<_Clock, __ct> __time_point;
return __time_point(__lhs.time_since_epoch() + __rhs);
}
template<typename _Rep1, typename _Period1,
typename _Clock, typename _Dur2>
constexpr time_point<_Clock,
typename common_type<duration<_Rep1, _Period1>, _Dur2>::type>
operator+(const duration<_Rep1, _Period1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{
typedef duration<_Rep1, _Period1> __dur1;
typedef typename common_type<__dur1,_Dur2>::type __ct;
typedef time_point<_Clock, __ct> __time_point;
return __time_point(__rhs.time_since_epoch() + __lhs);
}
template<typename _Clock, typename _Dur1,
typename _Rep2, typename _Period2>
constexpr time_point<_Clock,
typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
operator-(const time_point<_Clock, _Dur1>& __lhs,
const duration<_Rep2, _Period2>& __rhs)
{
typedef duration<_Rep2, _Period2> __dur2;
typedef typename common_type<_Dur1,__dur2>::type __ct;
typedef time_point<_Clock, __ct> __time_point;
return __time_point(__lhs.time_since_epoch() -__rhs);
}
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr typename common_type<_Dur1, _Dur2>::type
operator-(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr bool
operator==(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr bool
operator!=(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return !(__lhs == __rhs); }
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr bool
operator<(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr bool
operator<=(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return !(__rhs < __lhs); }
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr bool
operator>(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return __rhs < __lhs; }
template<typename _Clock, typename _Dur1, typename _Dur2>
constexpr bool
operator>=(const time_point<_Clock, _Dur1>& __lhs,
const time_point<_Clock, _Dur2>& __rhs)
{ return !(__lhs < __rhs); }
// Clocks.
// Why nanosecond resolution as the default?
// Why have std::system_clock always count in the higest
// resolution (ie nanoseconds), even if on some OSes the low 3
// or 9 decimal digits will be always zero? This allows later
// implementations to change the system_clock::now()
// implementation any time to provide better resolution without
// changing function signature or units.
// To support the (forward) evolution of the library's defined
// clocks, wrap inside inline namespace so that the current
// defintions of system_clock, steady_clock, and
// high_resolution_clock types are uniquely mangled. This way, new
// code can use the latests clocks, while the library can contain
// compatibility definitions for previous versions. At some
// point, when these clocks settle down, the inlined namespaces
// can be removed. XXX GLIBCXX_ABI Deprecated
inline namespace _V2 {
/**
* @brief System clock.
*
* Time returned represents wall time from the system-wide clock.
*/
struct system_clock
{
typedef chrono::nanoseconds duration;
typedef duration::rep rep;
typedef duration::period period;
typedef chrono::time_point<system_clock, duration> time_point;
static_assert(system_clock::duration::min()
< system_clock::duration::zero(),
"a clock's minimum duration cannot be less than its epoch");
static constexpr bool is_steady = false;
static time_point
now() noexcept;
// Map to C API
static std::time_t
to_time_t(const time_point& __t) noexcept
{
return std::time_t(duration_cast<chrono::seconds>
(__t.time_since_epoch()).count());
}
static time_point
from_time_t(std::time_t __t) noexcept
{
typedef chrono::time_point<system_clock, seconds> __from;
return time_point_cast<system_clock::duration>
(__from(chrono::seconds(__t)));
}
};
/**
* @brief Monotonic clock
*
* Time returned has the property of only increasing at a uniform rate.
*/
struct steady_clock
{
typedef chrono::nanoseconds duration;
typedef duration::rep rep;
typedef duration::period period;
typedef chrono::time_point<steady_clock, duration> time_point;
static constexpr bool is_steady = true;
static time_point
now() noexcept;
};
/**
* @brief Highest-resolution clock
*
* This is the clock "with the shortest tick period." Alias to
* std::system_clock until higher-than-nanosecond definitions
* become feasible.
*/
using high_resolution_clock = system_clock;
} // end inline namespace _V2
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace chrono
#if __cplusplus > 201103L
#define __cpp_lib_chrono_udls 201304
inline namespace literals
{
inline namespace chrono_literals
{
template<typename _Rep, unsigned long long _Val>
struct _Checked_integral_constant
: integral_constant<_Rep, static_cast<_Rep>(_Val)>
{
static_assert(_Checked_integral_constant::value >= 0
&& _Checked_integral_constant::value == _Val,
"literal value cannot be represented by duration type");
};
template<typename _Dur, char... _Digits>
constexpr _Dur __check_overflow()
{
using _Val = __parse_int::_Parse_int<_Digits...>;
using _Rep = typename _Dur::rep;
// TODO: should be simply integral_constant<_Rep, _Val::value>
// but GCC doesn't reject narrowing conversions to _Rep.
using _CheckedVal = _Checked_integral_constant<_Rep, _Val::value>;
return _Dur{_CheckedVal::value};
}
constexpr chrono::duration<long double, ratio<3600,1>>
operator""h(long double __hours)
{ return chrono::duration<long double, ratio<3600,1>>{__hours}; }
template <char... _Digits>
constexpr chrono::hours
operator""h()
{ return __check_overflow<chrono::hours, _Digits...>(); }
constexpr chrono::duration<long double, ratio<60,1>>
operator""min(long double __mins)
{ return chrono::duration<long double, ratio<60,1>>{__mins}; }
template <char... _Digits>
constexpr chrono::minutes
operator""min()
{ return __check_overflow<chrono::minutes, _Digits...>(); }
constexpr chrono::duration<long double>
operator""s(long double __secs)
{ return chrono::duration<long double>{__secs}; }
template <char... _Digits>
constexpr chrono::seconds
operator""s()
{ return __check_overflow<chrono::seconds, _Digits...>(); }
constexpr chrono::duration<long double, milli>
operator""ms(long double __msecs)
{ return chrono::duration<long double, milli>{__msecs}; }
template <char... _Digits>
constexpr chrono::milliseconds
operator""ms()
{ return __check_overflow<chrono::milliseconds, _Digits...>(); }
constexpr chrono::duration<long double, micro>
operator""us(long double __usecs)
{ return chrono::duration<long double, micro>{__usecs}; }
template <char... _Digits>
constexpr chrono::microseconds
operator""us()
{ return __check_overflow<chrono::microseconds, _Digits...>(); }
constexpr chrono::duration<long double, nano>
operator""ns(long double __nsecs)
{ return chrono::duration<long double, nano>{__nsecs}; }
template <char... _Digits>
constexpr chrono::nanoseconds
operator""ns()
{ return __check_overflow<chrono::nanoseconds, _Digits...>(); }
} // inline namespace chrono_literals
} // inline namespace literals
#endif // __cplusplus > 201103L
// @} group chrono
} // namespace std
#endif //_GLIBCXX_USE_C99_STDINT_TR1
#endif // C++11
#endif //_GLIBCXX_CHRONO
|