1// <chrono> -*- C++ -*-
2
3// Copyright (C) 2008-2017 Free Software Foundation, Inc.
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
8// Free Software Foundation; either version 3, or (at your option)
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
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/>.
24
25/** @file include/chrono
26 * This is a Standard C++ Library header.
27 */
28
29#ifndef _GLIBCXX_CHRONO
30#define _GLIBCXX_CHRONO 1
31
32#pragma GCC system_header
33
34#if __cplusplus < 201103L
35# include <bits/c++0x_warning.h>
36#else
37
38#include <ratio>
39#include <type_traits>
40#include <limits>
41#include <ctime>
42#include <bits/parse_numbers.h> // for literals support.
43
44#ifdef _GLIBCXX_USE_C99_STDINT_TR1
45
46namespace std _GLIBCXX_VISIBILITY(default)
47{
48_GLIBCXX_BEGIN_NAMESPACE_VERSION
49
50 /**
51 * @defgroup chrono Time
52 * @ingroup utilities
53 *
54 * Classes and functions for time.
55 * @{
56 */
57
58 /** @namespace std::chrono
59 * @brief ISO C++ 2011 entities sub-namespace for time and date.
60 */
61 namespace chrono
62 {
63 template<typename _Rep, typename _Period = ratio<1>>
64 struct duration;
65
66 template<typename _Clock, typename _Dur = typename _Clock::duration>
67 struct time_point;
68 }
69
70 // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
71
72 template<typename _CT, typename _Period1, typename _Period2>
73 struct __duration_common_type_wrapper
74 {
75 private:
76 typedef __static_gcd<_Period1::num, _Period2::num> __gcd_num;
77 typedef __static_gcd<_Period1::den, _Period2::den> __gcd_den;
78 typedef typename _CT::type __cr;
79 typedef ratio<__gcd_num::value,
80 (_Period1::den / __gcd_den::value) * _Period2::den> __r;
81 public:
82 typedef __success_type<chrono::duration<__cr, __r>> type;
83 };
84
85 template<typename _Period1, typename _Period2>
86 struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2>
87 { typedef __failure_type type; };
88
89 template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
90 struct common_type<chrono::duration<_Rep1, _Period1>,
91 chrono::duration<_Rep2, _Period2>>
92 : public __duration_common_type_wrapper<typename __member_type_wrapper<
93 common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type
94 { };
95
96 // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
97
98 template<typename _CT, typename _Clock>
99 struct __timepoint_common_type_wrapper
100 {
101 typedef __success_type<chrono::time_point<_Clock, typename _CT::type>>
102 type;
103 };
104
105 template<typename _Clock>
106 struct __timepoint_common_type_wrapper<__failure_type, _Clock>
107 { typedef __failure_type type; };
108
109 template<typename _Clock, typename _Duration1, typename _Duration2>
110 struct common_type<chrono::time_point<_Clock, _Duration1>,
111 chrono::time_point<_Clock, _Duration2>>
112 : public __timepoint_common_type_wrapper<typename __member_type_wrapper<
113 common_type<_Duration1, _Duration2>>::type, _Clock>::type
114 { };
115
116 namespace chrono
117 {
118 // Primary template for duration_cast impl.
119 template<typename _ToDur, typename _CF, typename _CR,
120 bool _NumIsOne = false, bool _DenIsOne = false>
121 struct __duration_cast_impl
122 {
123 template<typename _Rep, typename _Period>
124 static constexpr _ToDur
125 __cast(const duration<_Rep, _Period>& __d)
126 {
127 typedef typename _ToDur::rep __to_rep;
128 return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
129 * static_cast<_CR>(_CF::num)
130 / static_cast<_CR>(_CF::den)));
131 }
132 };
133
134 template<typename _ToDur, typename _CF, typename _CR>
135 struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
136 {
137 template<typename _Rep, typename _Period>
138 static constexpr _ToDur
139 __cast(const duration<_Rep, _Period>& __d)
140 {
141 typedef typename _ToDur::rep __to_rep;
142 return _ToDur(static_cast<__to_rep>(__d.count()));
143 }
144 };
145
146 template<typename _ToDur, typename _CF, typename _CR>
147 struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
148 {
149 template<typename _Rep, typename _Period>
150 static constexpr _ToDur
151 __cast(const duration<_Rep, _Period>& __d)
152 {
153 typedef typename _ToDur::rep __to_rep;
154 return _ToDur(static_cast<__to_rep>(
155 static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
156 }
157 };
158
159 template<typename _ToDur, typename _CF, typename _CR>
160 struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
161 {
162 template<typename _Rep, typename _Period>
163 static constexpr _ToDur
164 __cast(const duration<_Rep, _Period>& __d)
165 {
166 typedef typename _ToDur::rep __to_rep;
167 return _ToDur(static_cast<__to_rep>(
168 static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
169 }
170 };
171
172 template<typename _Tp>
173 struct __is_duration
174 : std::false_type
175 { };
176
177 template<typename _Rep, typename _Period>
178 struct __is_duration<duration<_Rep, _Period>>
179 : std::true_type
180 { };
181
182 template<typename _Tp>
183 using __enable_if_is_duration
184 = typename enable_if<__is_duration<_Tp>::value, _Tp>::type;
185
186 template<typename _Tp>
187 using __disable_if_is_duration
188 = typename enable_if<!__is_duration<_Tp>::value, _Tp>::type;
189
190 /// duration_cast
191 template<typename _ToDur, typename _Rep, typename _Period>
192 constexpr __enable_if_is_duration<_ToDur>
193 duration_cast(const duration<_Rep, _Period>& __d)
194 {
195 typedef typename _ToDur::period __to_period;
196 typedef typename _ToDur::rep __to_rep;
197 typedef ratio_divide<_Period, __to_period> __cf;
198 typedef typename common_type<__to_rep, _Rep, intmax_t>::type
199 __cr;
200 typedef __duration_cast_impl<_ToDur, __cf, __cr,
201 __cf::num == 1, __cf::den == 1> __dc;
202 return __dc::__cast(__d);
203 }
204
205 /// treat_as_floating_point
206 template<typename _Rep>
207 struct treat_as_floating_point
208 : is_floating_point<_Rep>
209 { };
210
211#if __cplusplus > 201402L
212 template <typename _Rep>
213 inline constexpr bool treat_as_floating_point_v =
214 treat_as_floating_point<_Rep>::value;
215#endif // C++17
216
217#if __cplusplus >= 201703L
218# define __cpp_lib_chrono 201611
219
220 template<typename _ToDur, typename _Rep, typename _Period>
221 constexpr __enable_if_is_duration<_ToDur>
222 floor(const duration<_Rep, _Period>& __d)
223 {
224 auto __to = chrono::duration_cast<_ToDur>(__d);
225 if (__to > __d)
226 return __to - _ToDur{1};
227 return __to;
228 }
229
230 template<typename _ToDur, typename _Rep, typename _Period>
231 constexpr __enable_if_is_duration<_ToDur>
232 ceil(const duration<_Rep, _Period>& __d)
233 {
234 auto __to = chrono::duration_cast<_ToDur>(__d);
235 if (__to < __d)
236 return __to + _ToDur{1};
237 return __to;
238 }
239
240 template <typename _ToDur, typename _Rep, typename _Period>
241 constexpr enable_if_t<
242 __and_<__is_duration<_ToDur>,
243 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
244 _ToDur>
245 round(const duration<_Rep, _Period>& __d)
246 {
247 _ToDur __t0 = chrono::floor<_ToDur>(__d);
248 _ToDur __t1 = __t0 + _ToDur{1};
249 auto __diff0 = __d - __t0;
250 auto __diff1 = __t1 - __d;
251 if (__diff0 == __diff1)
252 {
253 if (__t0.count() & 1)
254 return __t1;
255 return __t0;
256 }
257 else if (__diff0 < __diff1)
258 return __t0;
259 return __t1;
260 }
261
262 template<typename _Rep, typename _Period>
263 constexpr
264 enable_if_t<numeric_limits<_Rep>::is_signed, duration<_Rep, _Period>>
265 abs(duration<_Rep, _Period> __d)
266 {
267 if (__d >= __d.zero())
268 return __d;
269 return -__d;
270 }
271#endif // C++17
272
273 /// duration_values
274 template<typename _Rep>
275 struct duration_values
276 {
277 static constexpr _Rep
278 zero()
279 { return _Rep(0); }
280
281 static constexpr _Rep
282 max()
283 { return numeric_limits<_Rep>::max(); }
284
285 static constexpr _Rep
286 min()
287 { return numeric_limits<_Rep>::lowest(); }
288 };
289
290 template<typename _Tp>
291 struct __is_ratio
292 : std::false_type
293 { };
294
295 template<intmax_t _Num, intmax_t _Den>
296 struct __is_ratio<ratio<_Num, _Den>>
297 : std::true_type
298 { };
299
300 /// duration
301 template<typename _Rep, typename _Period>
302 struct duration
303 {
304 private:
305 template<typename _Rep2>
306 using __is_float = treat_as_floating_point<_Rep2>;
307
308 // _Period2 is an exact multiple of _Period
309 template<typename _Period2>
310 using __is_harmonic
311 = __bool_constant<ratio_divide<_Period2, _Period>::den == 1>;
312
313 public:
314
315 typedef _Rep rep;
316 typedef _Period period;
317
318 static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
319 static_assert(__is_ratio<_Period>::value,
320 "period must be a specialization of ratio");
321 static_assert(_Period::num > 0, "period must be positive");
322
323 // 20.11.5.1 construction / copy / destroy
324 constexpr duration() = default;
325
326 duration(const duration&) = default;
327
328 template<typename _Rep2, typename = _Require<
329 is_convertible<_Rep2, rep>,
330 __or_<__is_float<rep>, __not_<__is_float<_Rep2>>>>>
331 constexpr explicit duration(const _Rep2& __rep)
332 : __r(static_cast<rep>(__rep)) { }
333
334 template<typename _Rep2, typename _Period2, typename = _Require<
335 __or_<__is_float<rep>,
336 __and_<__is_harmonic<_Period2>,
337 __not_<__is_float<_Rep2>>>>>>
338 constexpr duration(const duration<_Rep2, _Period2>& __d)
339 : __r(duration_cast<duration>(__d).count()) { }
340
341 ~duration() = default;
342 duration& operator=(const duration&) = default;
343
344 // 20.11.5.2 observer
345 constexpr rep
346 count() const
347 { return __r; }
348
349 // 20.11.5.3 arithmetic
350 constexpr duration
351 operator+() const
352 { return *this; }
353
354 constexpr duration
355 operator-() const
356 { return duration(-__r); }
357
358 _GLIBCXX17_CONSTEXPR duration&
359 operator++()
360 {
361 ++__r;
362 return *this;
363 }
364
365 _GLIBCXX17_CONSTEXPR duration
366 operator++(int)
367 { return duration(__r++); }
368
369 _GLIBCXX17_CONSTEXPR duration&
370 operator--()
371 {
372 --__r;
373 return *this;
374 }
375
376 _GLIBCXX17_CONSTEXPR duration
377 operator--(int)
378 { return duration(__r--); }
379
380 _GLIBCXX17_CONSTEXPR duration&
381 operator+=(const duration& __d)
382 {
383 __r += __d.count();
384 return *this;
385 }
386
387 _GLIBCXX17_CONSTEXPR duration&
388 operator-=(const duration& __d)
389 {
390 __r -= __d.count();
391 return *this;
392 }
393
394 _GLIBCXX17_CONSTEXPR duration&
395 operator*=(const rep& __rhs)
396 {
397 __r *= __rhs;
398 return *this;
399 }
400
401 _GLIBCXX17_CONSTEXPR duration&
402 operator/=(const rep& __rhs)
403 {
404 __r /= __rhs;
405 return *this;
406 }
407
408 // DR 934.
409 template<typename _Rep2 = rep>
410 _GLIBCXX17_CONSTEXPR
411 typename enable_if<!treat_as_floating_point<_Rep2>::value,
412 duration&>::type
413 operator%=(const rep& __rhs)
414 {
415 __r %= __rhs;
416 return *this;
417 }
418
419 template<typename _Rep2 = rep>
420 _GLIBCXX17_CONSTEXPR
421 typename enable_if<!treat_as_floating_point<_Rep2>::value,
422 duration&>::type
423 operator%=(const duration& __d)
424 {
425 __r %= __d.count();
426 return *this;
427 }
428
429 // 20.11.5.4 special values
430 static constexpr duration
431 zero()
432 { return duration(duration_values<rep>::zero()); }
433
434 static constexpr duration
435 min()
436 { return duration(duration_values<rep>::min()); }
437
438 static constexpr duration
439 max()
440 { return duration(duration_values<rep>::max()); }
441
442 private:
443 rep __r;
444 };
445
446 template<typename _Rep1, typename _Period1,
447 typename _Rep2, typename _Period2>
448 constexpr typename common_type<duration<_Rep1, _Period1>,
449 duration<_Rep2, _Period2>>::type
450 operator+(const duration<_Rep1, _Period1>& __lhs,
451 const duration<_Rep2, _Period2>& __rhs)
452 {
453 typedef duration<_Rep1, _Period1> __dur1;
454 typedef duration<_Rep2, _Period2> __dur2;
455 typedef typename common_type<__dur1,__dur2>::type __cd;
456 return __cd(__cd(__lhs).count() + __cd(__rhs).count());
457 }
458
459 template<typename _Rep1, typename _Period1,
460 typename _Rep2, typename _Period2>
461 constexpr typename common_type<duration<_Rep1, _Period1>,
462 duration<_Rep2, _Period2>>::type
463 operator-(const duration<_Rep1, _Period1>& __lhs,
464 const duration<_Rep2, _Period2>& __rhs)
465 {
466 typedef duration<_Rep1, _Period1> __dur1;
467 typedef duration<_Rep2, _Period2> __dur2;
468 typedef typename common_type<__dur1,__dur2>::type __cd;
469 return __cd(__cd(__lhs).count() - __cd(__rhs).count());
470 }
471
472 // SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2
473 // is implicitly convertible to it.
474 template<typename _Rep1, typename _Rep2,
475 typename _CRep = typename common_type<_Rep1, _Rep2>::type>
476 using __common_rep_t
477 = typename enable_if<is_convertible<_Rep2, _CRep>::value, _CRep>::type;
478
479 template<typename _Rep1, typename _Period, typename _Rep2>
480 constexpr duration<__common_rep_t<_Rep1, _Rep2>, _Period>
481 operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
482 {
483 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
484 __cd;
485 return __cd(__cd(__d).count() * __s);
486 }
487
488 template<typename _Rep1, typename _Rep2, typename _Period>
489 constexpr duration<__common_rep_t<_Rep2, _Rep1>, _Period>
490 operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
491 { return __d * __s; }
492
493 template<typename _Rep1, typename _Period, typename _Rep2>
494 constexpr
495 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period>
496 operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
497 {
498 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
499 __cd;
500 return __cd(__cd(__d).count() / __s);
501 }
502
503 template<typename _Rep1, typename _Period1,
504 typename _Rep2, typename _Period2>
505 constexpr typename common_type<_Rep1, _Rep2>::type
506 operator/(const duration<_Rep1, _Period1>& __lhs,
507 const duration<_Rep2, _Period2>& __rhs)
508 {
509 typedef duration<_Rep1, _Period1> __dur1;
510 typedef duration<_Rep2, _Period2> __dur2;
511 typedef typename common_type<__dur1,__dur2>::type __cd;
512 return __cd(__lhs).count() / __cd(__rhs).count();
513 }
514
515 // DR 934.
516 template<typename _Rep1, typename _Period, typename _Rep2>
517 constexpr
518 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period>
519 operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
520 {
521 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
522 __cd;
523 return __cd(__cd(__d).count() % __s);
524 }
525
526 template<typename _Rep1, typename _Period1,
527 typename _Rep2, typename _Period2>
528 constexpr typename common_type<duration<_Rep1, _Period1>,
529 duration<_Rep2, _Period2>>::type
530 operator%(const duration<_Rep1, _Period1>& __lhs,
531 const duration<_Rep2, _Period2>& __rhs)
532 {
533 typedef duration<_Rep1, _Period1> __dur1;
534 typedef duration<_Rep2, _Period2> __dur2;
535 typedef typename common_type<__dur1,__dur2>::type __cd;
536 return __cd(__cd(__lhs).count() % __cd(__rhs).count());
537 }
538
539 // comparisons
540 template<typename _Rep1, typename _Period1,
541 typename _Rep2, typename _Period2>
542 constexpr bool
543 operator==(const duration<_Rep1, _Period1>& __lhs,
544 const duration<_Rep2, _Period2>& __rhs)
545 {
546 typedef duration<_Rep1, _Period1> __dur1;
547 typedef duration<_Rep2, _Period2> __dur2;
548 typedef typename common_type<__dur1,__dur2>::type __ct;
549 return __ct(__lhs).count() == __ct(__rhs).count();
550 }
551
552 template<typename _Rep1, typename _Period1,
553 typename _Rep2, typename _Period2>
554 constexpr bool
555 operator<(const duration<_Rep1, _Period1>& __lhs,
556 const duration<_Rep2, _Period2>& __rhs)
557 {
558 typedef duration<_Rep1, _Period1> __dur1;
559 typedef duration<_Rep2, _Period2> __dur2;
560 typedef typename common_type<__dur1,__dur2>::type __ct;
561 return __ct(__lhs).count() < __ct(__rhs).count();
562 }
563
564 template<typename _Rep1, typename _Period1,
565 typename _Rep2, typename _Period2>
566 constexpr bool
567 operator!=(const duration<_Rep1, _Period1>& __lhs,
568 const duration<_Rep2, _Period2>& __rhs)
569 { return !(__lhs == __rhs); }
570
571 template<typename _Rep1, typename _Period1,
572 typename _Rep2, typename _Period2>
573 constexpr bool
574 operator<=(const duration<_Rep1, _Period1>& __lhs,
575 const duration<_Rep2, _Period2>& __rhs)
576 { return !(__rhs < __lhs); }
577
578 template<typename _Rep1, typename _Period1,
579 typename _Rep2, typename _Period2>
580 constexpr bool
581 operator>(const duration<_Rep1, _Period1>& __lhs,
582 const duration<_Rep2, _Period2>& __rhs)
583 { return __rhs < __lhs; }
584
585 template<typename _Rep1, typename _Period1,
586 typename _Rep2, typename _Period2>
587 constexpr bool
588 operator>=(const duration<_Rep1, _Period1>& __lhs,
589 const duration<_Rep2, _Period2>& __rhs)
590 { return !(__lhs < __rhs); }
591
592 /// nanoseconds
593 typedef duration<int64_t, nano> nanoseconds;
594
595 /// microseconds
596 typedef duration<int64_t, micro> microseconds;
597
598 /// milliseconds
599 typedef duration<int64_t, milli> milliseconds;
600
601 /// seconds
602 typedef duration<int64_t> seconds;
603
604 /// minutes
605 typedef duration<int64_t, ratio< 60>> minutes;
606
607 /// hours
608 typedef duration<int64_t, ratio<3600>> hours;
609
610 /// time_point
611 template<typename _Clock, typename _Dur>
612 struct time_point
613 {
614 typedef _Clock clock;
615 typedef _Dur duration;
616 typedef typename duration::rep rep;
617 typedef typename duration::period period;
618
619 constexpr time_point() : __d(duration::zero())
620 { }
621
622 constexpr explicit time_point(const duration& __dur)
623 : __d(__dur)
624 { }
625
626 // conversions
627 template<typename _Dur2,
628 typename = _Require<is_convertible<_Dur2, _Dur>>>
629 constexpr time_point(const time_point<clock, _Dur2>& __t)
630 : __d(__t.time_since_epoch())
631 { }
632
633 // observer
634 constexpr duration
635 time_since_epoch() const
636 { return __d; }
637
638 // arithmetic
639 _GLIBCXX17_CONSTEXPR time_point&
640 operator+=(const duration& __dur)
641 {
642 __d += __dur;
643 return *this;
644 }
645
646 _GLIBCXX17_CONSTEXPR time_point&
647 operator-=(const duration& __dur)
648 {
649 __d -= __dur;
650 return *this;
651 }
652
653 // special values
654 static constexpr time_point
655 min()
656 { return time_point(duration::min()); }
657
658 static constexpr time_point
659 max()
660 { return time_point(duration::max()); }
661
662 private:
663 duration __d;
664 };
665
666 /// time_point_cast
667 template<typename _ToDur, typename _Clock, typename _Dur>
668 constexpr typename enable_if<__is_duration<_ToDur>::value,
669 time_point<_Clock, _ToDur>>::type
670 time_point_cast(const time_point<_Clock, _Dur>& __t)
671 {
672 typedef time_point<_Clock, _ToDur> __time_point;
673 return __time_point(duration_cast<_ToDur>(__t.time_since_epoch()));
674 }
675
676#if __cplusplus > 201402L
677 template<typename _ToDur, typename _Clock, typename _Dur>
678 constexpr
679 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
680 floor(const time_point<_Clock, _Dur>& __tp)
681 {
682 return time_point<_Clock, _ToDur>{
683 chrono::floor<_ToDur>(__tp.time_since_epoch())};
684 }
685
686 template<typename _ToDur, typename _Clock, typename _Dur>
687 constexpr
688 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
689 ceil(const time_point<_Clock, _Dur>& __tp)
690 {
691 return time_point<_Clock, _ToDur>{
692 chrono::ceil<_ToDur>(__tp.time_since_epoch())};
693 }
694
695 template<typename _ToDur, typename _Clock, typename _Dur>
696 constexpr enable_if_t<
697 __and_<__is_duration<_ToDur>,
698 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
699 time_point<_Clock, _ToDur>>
700 round(const time_point<_Clock, _Dur>& __tp)
701 {
702 return time_point<_Clock, _ToDur>{
703 chrono::round<_ToDur>(__tp.time_since_epoch())};
704 }
705#endif // C++17
706
707 template<typename _Clock, typename _Dur1,
708 typename _Rep2, typename _Period2>
709 constexpr time_point<_Clock,
710 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
711 operator+(const time_point<_Clock, _Dur1>& __lhs,
712 const duration<_Rep2, _Period2>& __rhs)
713 {
714 typedef duration<_Rep2, _Period2> __dur2;
715 typedef typename common_type<_Dur1,__dur2>::type __ct;
716 typedef time_point<_Clock, __ct> __time_point;
717 return __time_point(__lhs.time_since_epoch() + __rhs);
718 }
719
720 template<typename _Rep1, typename _Period1,
721 typename _Clock, typename _Dur2>
722 constexpr time_point<_Clock,
723 typename common_type<duration<_Rep1, _Period1>, _Dur2>::type>
724 operator+(const duration<_Rep1, _Period1>& __lhs,
725 const time_point<_Clock, _Dur2>& __rhs)
726 {
727 typedef duration<_Rep1, _Period1> __dur1;
728 typedef typename common_type<__dur1,_Dur2>::type __ct;
729 typedef time_point<_Clock, __ct> __time_point;
730 return __time_point(__rhs.time_since_epoch() + __lhs);
731 }
732
733 template<typename _Clock, typename _Dur1,
734 typename _Rep2, typename _Period2>
735 constexpr time_point<_Clock,
736 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
737 operator-(const time_point<_Clock, _Dur1>& __lhs,
738 const duration<_Rep2, _Period2>& __rhs)
739 {
740 typedef duration<_Rep2, _Period2> __dur2;
741 typedef typename common_type<_Dur1,__dur2>::type __ct;
742 typedef time_point<_Clock, __ct> __time_point;
743 return __time_point(__lhs.time_since_epoch() -__rhs);
744 }
745
746 template<typename _Clock, typename _Dur1, typename _Dur2>
747 constexpr typename common_type<_Dur1, _Dur2>::type
748 operator-(const time_point<_Clock, _Dur1>& __lhs,
749 const time_point<_Clock, _Dur2>& __rhs)
750 { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
751
752 template<typename _Clock, typename _Dur1, typename _Dur2>
753 constexpr bool
754 operator==(const time_point<_Clock, _Dur1>& __lhs,
755 const time_point<_Clock, _Dur2>& __rhs)
756 { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
757
758 template<typename _Clock, typename _Dur1, typename _Dur2>
759 constexpr bool
760 operator!=(const time_point<_Clock, _Dur1>& __lhs,
761 const time_point<_Clock, _Dur2>& __rhs)
762 { return !(__lhs == __rhs); }
763
764 template<typename _Clock, typename _Dur1, typename _Dur2>
765 constexpr bool
766 operator<(const time_point<_Clock, _Dur1>& __lhs,
767 const time_point<_Clock, _Dur2>& __rhs)
768 { return __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
769
770 template<typename _Clock, typename _Dur1, typename _Dur2>
771 constexpr bool
772 operator<=(const time_point<_Clock, _Dur1>& __lhs,
773 const time_point<_Clock, _Dur2>& __rhs)
774 { return !(__rhs < __lhs); }
775
776 template<typename _Clock, typename _Dur1, typename _Dur2>
777 constexpr bool
778 operator>(const time_point<_Clock, _Dur1>& __lhs,
779 const time_point<_Clock, _Dur2>& __rhs)
780 { return __rhs < __lhs; }
781
782 template<typename _Clock, typename _Dur1, typename _Dur2>
783 constexpr bool
784 operator>=(const time_point<_Clock, _Dur1>& __lhs,
785 const time_point<_Clock, _Dur2>& __rhs)
786 { return !(__lhs < __rhs); }
787
788
789 // Clocks.
790
791 // Why nanosecond resolution as the default?
792 // Why have std::system_clock always count in the highest
793 // resolution (ie nanoseconds), even if on some OSes the low 3
794 // or 9 decimal digits will be always zero? This allows later
795 // implementations to change the system_clock::now()
796 // implementation any time to provide better resolution without
797 // changing function signature or units.
798
799 // To support the (forward) evolution of the library's defined
800 // clocks, wrap inside inline namespace so that the current
801 // defintions of system_clock, steady_clock, and
802 // high_resolution_clock types are uniquely mangled. This way, new
803 // code can use the latests clocks, while the library can contain
804 // compatibility definitions for previous versions. At some
805 // point, when these clocks settle down, the inlined namespaces
806 // can be removed. XXX GLIBCXX_ABI Deprecated
807 inline namespace _V2 {
808
809 /**
810 * @brief System clock.
811 *
812 * Time returned represents wall time from the system-wide clock.
813 */
814 struct system_clock
815 {
816 typedef chrono::nanoseconds duration;
817 typedef duration::rep rep;
818 typedef duration::period period;
819 typedef chrono::time_point<system_clock, duration> time_point;
820
821 static_assert(system_clock::duration::min()
822 < system_clock::duration::zero(),
823 "a clock's minimum duration cannot be less than its epoch");
824
825 static constexpr bool is_steady = false;
826
827 static time_point
828 now() noexcept;
829
830 // Map to C API
831 static std::time_t
832 to_time_t(const time_point& __t) noexcept
833 {
834 return std::time_t(duration_cast<chrono::seconds>
835 (__t.time_since_epoch()).count());
836 }
837
838 static time_point
839 from_time_t(std::time_t __t) noexcept
840 {
841 typedef chrono::time_point<system_clock, seconds> __from;
842 return time_point_cast<system_clock::duration>
843 (__from(chrono::seconds(__t)));
844 }
845 };
846
847
848 /**
849 * @brief Monotonic clock
850 *
851 * Time returned has the property of only increasing at a uniform rate.
852 */
853 struct steady_clock
854 {
855 typedef chrono::nanoseconds duration;
856 typedef duration::rep rep;
857 typedef duration::period period;
858 typedef chrono::time_point<steady_clock, duration> time_point;
859
860 static constexpr bool is_steady = true;
861
862 static time_point
863 now() noexcept;
864 };
865
866
867 /**
868 * @brief Highest-resolution clock
869 *
870 * This is the clock "with the shortest tick period." Alias to
871 * std::system_clock until higher-than-nanosecond definitions
872 * become feasible.
873 */
874 using high_resolution_clock = system_clock;
875
876 } // end inline namespace _V2
877 } // namespace chrono
878
879#if __cplusplus > 201103L
880
881#define __cpp_lib_chrono_udls 201304
882
883 inline namespace literals
884 {
885 inline namespace chrono_literals
886 {
887#pragma GCC diagnostic push
888#pragma GCC diagnostic ignored "-Wliteral-suffix"
889 template<typename _Rep, unsigned long long _Val>
890 struct _Checked_integral_constant
891 : integral_constant<_Rep, static_cast<_Rep>(_Val)>
892 {
893 static_assert(_Checked_integral_constant::value >= 0
894 && _Checked_integral_constant::value == _Val,
895 "literal value cannot be represented by duration type");
896 };
897
898 template<typename _Dur, char... _Digits>
899 constexpr _Dur __check_overflow()
900 {
901 using _Val = __parse_int::_Parse_int<_Digits...>;
902 using _Rep = typename _Dur::rep;
903 // TODO: should be simply integral_constant<_Rep, _Val::value>
904 // but GCC doesn't reject narrowing conversions to _Rep.
905 using _CheckedVal = _Checked_integral_constant<_Rep, _Val::value>;
906 return _Dur{_CheckedVal::value};
907 }
908
909 constexpr chrono::duration<long double, ratio<3600,1>>
910 operator""h(long double __hours)
911 { return chrono::duration<long double, ratio<3600,1>>{__hours}; }
912
913 template <char... _Digits>
914 constexpr chrono::hours
915 operator""h()
916 { return __check_overflow<chrono::hours, _Digits...>(); }
917
918 constexpr chrono::duration<long double, ratio<60,1>>
919 operator""min(long double __mins)
920 { return chrono::duration<long double, ratio<60,1>>{__mins}; }
921
922 template <char... _Digits>
923 constexpr chrono::minutes
924 operator""min()
925 { return __check_overflow<chrono::minutes, _Digits...>(); }
926
927 constexpr chrono::duration<long double>
928 operator""s(long double __secs)
929 { return chrono::duration<long double>{__secs}; }
930
931 template <char... _Digits>
932 constexpr chrono::seconds
933 operator""s()
934 { return __check_overflow<chrono::seconds, _Digits...>(); }
935
936 constexpr chrono::duration<long double, milli>
937 operator""ms(long double __msecs)
938 { return chrono::duration<long double, milli>{__msecs}; }
939
940 template <char... _Digits>
941 constexpr chrono::milliseconds
942 operator""ms()
943 { return __check_overflow<chrono::milliseconds, _Digits...>(); }
944
945 constexpr chrono::duration<long double, micro>
946 operator""us(long double __usecs)
947 { return chrono::duration<long double, micro>{__usecs}; }
948
949 template <char... _Digits>
950 constexpr chrono::microseconds
951 operator""us()
952 { return __check_overflow<chrono::microseconds, _Digits...>(); }
953
954 constexpr chrono::duration<long double, nano>
955 operator""ns(long double __nsecs)
956 { return chrono::duration<long double, nano>{__nsecs}; }
957
958 template <char... _Digits>
959 constexpr chrono::nanoseconds
960 operator""ns()
961 { return __check_overflow<chrono::nanoseconds, _Digits...>(); }
962
963#pragma GCC diagnostic pop
964 } // inline namespace chrono_literals
965 } // inline namespace literals
966
967 namespace chrono
968 {
969 using namespace literals::chrono_literals;
970 } // namespace chrono
971
972#endif // C++14
973
974 // @} group chrono
975
976_GLIBCXX_END_NAMESPACE_VERSION
977} // namespace std
978
979#endif //_GLIBCXX_USE_C99_STDINT_TR1
980
981#endif // C++11
982
983#endif //_GLIBCXX_CHRONO
984