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 /**
49 * @defgroup chrono Time
50 * @ingroup utilities
51 *
52 * Classes and functions for time.
53 * @{
54 */
55
56 /** @namespace std::chrono
57 * @brief ISO C++ 2011 entities sub-namespace for time and date.
58 */
59 namespace chrono
60 {
61 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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 _GLIBCXX_END_NAMESPACE_VERSION
70 }
71
72_GLIBCXX_BEGIN_NAMESPACE_VERSION
73
74 // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
75
76 template<typename _CT, typename _Period1, typename _Period2>
77 struct __duration_common_type_wrapper
78 {
79 private:
80 typedef __static_gcd<_Period1::num, _Period2::num> __gcd_num;
81 typedef __static_gcd<_Period1::den, _Period2::den> __gcd_den;
82 typedef typename _CT::type __cr;
83 typedef ratio<__gcd_num::value,
84 (_Period1::den / __gcd_den::value) * _Period2::den> __r;
85 public:
86 typedef __success_type<chrono::duration<__cr, __r>> type;
87 };
88
89 template<typename _Period1, typename _Period2>
90 struct __duration_common_type_wrapper<__failure_type, _Period1, _Period2>
91 { typedef __failure_type type; };
92
93 template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
94 struct common_type<chrono::duration<_Rep1, _Period1>,
95 chrono::duration<_Rep2, _Period2>>
96 : public __duration_common_type_wrapper<typename __member_type_wrapper<
97 common_type<_Rep1, _Rep2>>::type, _Period1, _Period2>::type
98 { };
99
100 // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
101
102 template<typename _CT, typename _Clock>
103 struct __timepoint_common_type_wrapper
104 {
105 typedef __success_type<chrono::time_point<_Clock, typename _CT::type>>
106 type;
107 };
108
109 template<typename _Clock>
110 struct __timepoint_common_type_wrapper<__failure_type, _Clock>
111 { typedef __failure_type type; };
112
113 template<typename _Clock, typename _Duration1, typename _Duration2>
114 struct common_type<chrono::time_point<_Clock, _Duration1>,
115 chrono::time_point<_Clock, _Duration2>>
116 : public __timepoint_common_type_wrapper<typename __member_type_wrapper<
117 common_type<_Duration1, _Duration2>>::type, _Clock>::type
118 { };
119
120_GLIBCXX_END_NAMESPACE_VERSION
121
122 namespace chrono
123 {
124 _GLIBCXX_BEGIN_NAMESPACE_VERSION
125
126 // Primary template for duration_cast impl.
127 template<typename _ToDur, typename _CF, typename _CR,
128 bool _NumIsOne = false, bool _DenIsOne = false>
129 struct __duration_cast_impl
130 {
131 template<typename _Rep, typename _Period>
132 static constexpr _ToDur
133 __cast(const duration<_Rep, _Period>& __d)
134 {
135 typedef typename _ToDur::rep __to_rep;
136 return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
137 * static_cast<_CR>(_CF::num)
138 / static_cast<_CR>(_CF::den)));
139 }
140 };
141
142 template<typename _ToDur, typename _CF, typename _CR>
143 struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
144 {
145 template<typename _Rep, typename _Period>
146 static constexpr _ToDur
147 __cast(const duration<_Rep, _Period>& __d)
148 {
149 typedef typename _ToDur::rep __to_rep;
150 return _ToDur(static_cast<__to_rep>(__d.count()));
151 }
152 };
153
154 template<typename _ToDur, typename _CF, typename _CR>
155 struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
156 {
157 template<typename _Rep, typename _Period>
158 static constexpr _ToDur
159 __cast(const duration<_Rep, _Period>& __d)
160 {
161 typedef typename _ToDur::rep __to_rep;
162 return _ToDur(static_cast<__to_rep>(
163 static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
164 }
165 };
166
167 template<typename _ToDur, typename _CF, typename _CR>
168 struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
169 {
170 template<typename _Rep, typename _Period>
171 static constexpr _ToDur
172 __cast(const duration<_Rep, _Period>& __d)
173 {
174 typedef typename _ToDur::rep __to_rep;
175 return _ToDur(static_cast<__to_rep>(
176 static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
177 }
178 };
179
180 template<typename _Tp>
181 struct __is_duration
182 : std::false_type
183 { };
184
185 template<typename _Rep, typename _Period>
186 struct __is_duration<duration<_Rep, _Period>>
187 : std::true_type
188 { };
189
190 /// duration_cast
191 template<typename _ToDur, typename _Rep, typename _Period>
192 constexpr typename enable_if<__is_duration<_ToDur>::value,
193 _ToDur>::type
194 duration_cast(const duration<_Rep, _Period>& __d)
195 {
196 typedef typename _ToDur::period __to_period;
197 typedef typename _ToDur::rep __to_rep;
198 typedef ratio_divide<_Period, __to_period> __cf;
199 typedef typename common_type<__to_rep, _Rep, intmax_t>::type
200 __cr;
201 typedef __duration_cast_impl<_ToDur, __cf, __cr,
202 __cf::num == 1, __cf::den == 1> __dc;
203 return __dc::__cast(__d);
204 }
205
206 /// treat_as_floating_point
207 template<typename _Rep>
208 struct treat_as_floating_point
209 : is_floating_point<_Rep>
210 { };
211
212#if __cplusplus > 201402L
213 template <typename _Rep>
214 inline constexpr bool treat_as_floating_point_v =
215 treat_as_floating_point<_Rep>::value;
216#endif // C++17
217
218#if __cplusplus >= 201703L
219# define __cpp_lib_chrono 201611
220
221 template<typename _ToDur, typename _Rep, typename _Period>
222 constexpr enable_if_t<__is_duration<_ToDur>::value, _ToDur>
223 floor(const duration<_Rep, _Period>& __d)
224 {
225 auto __to = chrono::duration_cast<_ToDur>(__d);
226 if (__to > __d)
227 return __to - _ToDur{1};
228 return __to;
229 }
230
231 template<typename _ToDur, typename _Rep, typename _Period>
232 constexpr enable_if_t<__is_duration<_ToDur>::value, _ToDur>
233 ceil(const duration<_Rep, _Period>& __d)
234 {
235 auto __to = chrono::duration_cast<_ToDur>(__d);
236 if (__to < __d)
237 return __to + _ToDur{1};
238 return __to;
239 }
240
241 template <typename _ToDur, typename _Rep, typename _Period>
242 constexpr enable_if_t<
243 __and_<__is_duration<_ToDur>,
244 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
245 _ToDur>
246 round(const duration<_Rep, _Period>& __d)
247 {
248 _ToDur __t0 = chrono::floor<_ToDur>(__d);
249 _ToDur __t1 = __t0 + _ToDur{1};
250 auto __diff0 = __d - __t0;
251 auto __diff1 = __t1 - __d;
252 if (__diff0 == __diff1)
253 {
254 if (__t0.count() & 1)
255 return __t1;
256 return __t0;
257 }
258 else if (__diff0 < __diff1)
259 return __t0;
260 return __t1;
261 }
262
263 template<typename _Rep, typename _Period>
264 constexpr
265 enable_if_t<numeric_limits<_Rep>::is_signed, duration<_Rep, _Period>>
266 abs(duration<_Rep, _Period> __d)
267 {
268 if (__d >= __d.zero())
269 return __d;
270 return -__d;
271 }
272#endif // C++17
273
274 /// duration_values
275 template<typename _Rep>
276 struct duration_values
277 {
278 static constexpr _Rep
279 zero()
280 { return _Rep(0); }
281
282 static constexpr _Rep
283 max()
284 { return numeric_limits<_Rep>::max(); }
285
286 static constexpr _Rep
287 min()
288 { return numeric_limits<_Rep>::lowest(); }
289 };
290
291 template<typename _Tp>
292 struct __is_ratio
293 : std::false_type
294 { };
295
296 template<intmax_t _Num, intmax_t _Den>
297 struct __is_ratio<ratio<_Num, _Den>>
298 : std::true_type
299 { };
300
301 /// duration
302 template<typename _Rep, typename _Period>
303 struct duration
304 {
305 typedef _Rep rep;
306 typedef _Period period;
307
308 static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
309 static_assert(__is_ratio<_Period>::value,
310 "period must be a specialization of ratio");
311 static_assert(_Period::num > 0, "period must be positive");
312
313 // 20.11.5.1 construction / copy / destroy
314 constexpr duration() = default;
315
316 // NB: Make constexpr implicit. This cannot be explicitly
317 // constexpr, as any UDT that is not a literal type with a
318 // constexpr copy constructor will be ill-formed.
319 duration(const duration&) = default;
320
321 // _GLIBCXX_RESOLVE_LIB_DEFECTS
322 // 3050. Conversion specification problem in chrono::duration
323 template<typename _Rep2, typename = typename
324 enable_if<is_convertible<const _Rep2&, rep>::value
325 && (treat_as_floating_point<rep>::value
326 || !treat_as_floating_point<_Rep2>::value)>::type>
327 constexpr explicit duration(const _Rep2& __rep)
328 : __r(static_cast<rep>(__rep)) { }
329
330 template<typename _Rep2, typename _Period2, typename = typename
331 enable_if<treat_as_floating_point<rep>::value
332 || (ratio_divide<_Period2, period>::den == 1
333 && !treat_as_floating_point<_Rep2>::value)>::type>
334 constexpr duration(const duration<_Rep2, _Period2>& __d)
335 : __r(duration_cast<duration>(__d).count()) { }
336
337 ~duration() = default;
338 duration& operator=(const duration&) = default;
339
340 // 20.11.5.2 observer
341 constexpr rep
342 count() const
343 { return __r; }
344
345 // 20.11.5.3 arithmetic
346 constexpr duration
347 operator+() const
348 { return *this; }
349
350 constexpr duration
351 operator-() const
352 { return duration(-__r); }
353
354 _GLIBCXX17_CONSTEXPR duration&
355 operator++()
356 {
357 ++__r;
358 return *this;
359 }
360
361 _GLIBCXX17_CONSTEXPR duration
362 operator++(int)
363 { return duration(__r++); }
364
365 _GLIBCXX17_CONSTEXPR duration&
366 operator--()
367 {
368 --__r;
369 return *this;
370 }
371
372 _GLIBCXX17_CONSTEXPR duration
373 operator--(int)
374 { return duration(__r--); }
375
376 _GLIBCXX17_CONSTEXPR duration&
377 operator+=(const duration& __d)
378 {
379 __r += __d.count();
380 return *this;
381 }
382
383 _GLIBCXX17_CONSTEXPR duration&
384 operator-=(const duration& __d)
385 {
386 __r -= __d.count();
387 return *this;
388 }
389
390 _GLIBCXX17_CONSTEXPR duration&
391 operator*=(const rep& __rhs)
392 {
393 __r *= __rhs;
394 return *this;
395 }
396
397 _GLIBCXX17_CONSTEXPR duration&
398 operator/=(const rep& __rhs)
399 {
400 __r /= __rhs;
401 return *this;
402 }
403
404 // DR 934.
405 template<typename _Rep2 = rep>
406 _GLIBCXX17_CONSTEXPR
407 typename enable_if<!treat_as_floating_point<_Rep2>::value,
408 duration&>::type
409 operator%=(const rep& __rhs)
410 {
411 __r %= __rhs;
412 return *this;
413 }
414
415 template<typename _Rep2 = rep>
416 _GLIBCXX17_CONSTEXPR
417 typename enable_if<!treat_as_floating_point<_Rep2>::value,
418 duration&>::type
419 operator%=(const duration& __d)
420 {
421 __r %= __d.count();
422 return *this;
423 }
424
425 // 20.11.5.4 special values
426 static constexpr duration
427 zero()
428 { return duration(duration_values<rep>::zero()); }
429
430 static constexpr duration
431 min()
432 { return duration(duration_values<rep>::min()); }
433
434 static constexpr duration
435 max()
436 { return duration(duration_values<rep>::max()); }
437
438 private:
439 rep __r;
440 };
441
442 template<typename _Rep1, typename _Period1,
443 typename _Rep2, typename _Period2>
444 constexpr typename common_type<duration<_Rep1, _Period1>,
445 duration<_Rep2, _Period2>>::type
446 operator+(const duration<_Rep1, _Period1>& __lhs,
447 const duration<_Rep2, _Period2>& __rhs)
448 {
449 typedef duration<_Rep1, _Period1> __dur1;
450 typedef duration<_Rep2, _Period2> __dur2;
451 typedef typename common_type<__dur1,__dur2>::type __cd;
452 return __cd(__cd(__lhs).count() + __cd(__rhs).count());
453 }
454
455 template<typename _Rep1, typename _Period1,
456 typename _Rep2, typename _Period2>
457 constexpr typename common_type<duration<_Rep1, _Period1>,
458 duration<_Rep2, _Period2>>::type
459 operator-(const duration<_Rep1, _Period1>& __lhs,
460 const duration<_Rep2, _Period2>& __rhs)
461 {
462 typedef duration<_Rep1, _Period1> __dur1;
463 typedef duration<_Rep2, _Period2> __dur2;
464 typedef typename common_type<__dur1,__dur2>::type __cd;
465 return __cd(__cd(__lhs).count() - __cd(__rhs).count());
466 }
467
468 // SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2
469 // is implicitly convertible to it.
470 // _GLIBCXX_RESOLVE_LIB_DEFECTS
471 // 3050. Conversion specification problem in chrono::duration constructor
472 template<typename _Rep1, typename _Rep2, bool =
473 is_convertible<const _Rep2&,
474 typename common_type<_Rep1, _Rep2>::type>::value>
475 struct __common_rep_type { };
476
477 template<typename _Rep1, typename _Rep2>
478 struct __common_rep_type<_Rep1, _Rep2, true>
479 { typedef typename common_type<_Rep1, _Rep2>::type type; };
480
481 template<typename _Rep1, typename _Period, typename _Rep2>
482 constexpr
483 duration<typename __common_rep_type<_Rep1, _Rep2>::type, _Period>
484 operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
485 {
486 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
487 __cd;
488 return __cd(__cd(__d).count() * __s);
489 }
490
491 template<typename _Rep1, typename _Rep2, typename _Period>
492 constexpr
493 duration<typename __common_rep_type<_Rep2, _Rep1>::type, _Period>
494 operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
495 { return __d * __s; }
496
497 template<typename _Rep1, typename _Period, typename _Rep2>
498 constexpr duration<typename __common_rep_type<_Rep1, typename
499 enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
500 operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
501 {
502 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
503 __cd;
504 return __cd(__cd(__d).count() / __s);
505 }
506
507 template<typename _Rep1, typename _Period1,
508 typename _Rep2, typename _Period2>
509 constexpr typename common_type<_Rep1, _Rep2>::type
510 operator/(const duration<_Rep1, _Period1>& __lhs,
511 const duration<_Rep2, _Period2>& __rhs)
512 {
513 typedef duration<_Rep1, _Period1> __dur1;
514 typedef duration<_Rep2, _Period2> __dur2;
515 typedef typename common_type<__dur1,__dur2>::type __cd;
516 return __cd(__lhs).count() / __cd(__rhs).count();
517 }
518
519 // DR 934.
520 template<typename _Rep1, typename _Period, typename _Rep2>
521 constexpr duration<typename __common_rep_type<_Rep1, typename
522 enable_if<!__is_duration<_Rep2>::value, _Rep2>::type>::type, _Period>
523 operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
524 {
525 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
526 __cd;
527 return __cd(__cd(__d).count() % __s);
528 }
529
530 template<typename _Rep1, typename _Period1,
531 typename _Rep2, typename _Period2>
532 constexpr typename common_type<duration<_Rep1, _Period1>,
533 duration<_Rep2, _Period2>>::type
534 operator%(const duration<_Rep1, _Period1>& __lhs,
535 const duration<_Rep2, _Period2>& __rhs)
536 {
537 typedef duration<_Rep1, _Period1> __dur1;
538 typedef duration<_Rep2, _Period2> __dur2;
539 typedef typename common_type<__dur1,__dur2>::type __cd;
540 return __cd(__cd(__lhs).count() % __cd(__rhs).count());
541 }
542
543 // comparisons
544 template<typename _Rep1, typename _Period1,
545 typename _Rep2, typename _Period2>
546 constexpr bool
547 operator==(const duration<_Rep1, _Period1>& __lhs,
548 const duration<_Rep2, _Period2>& __rhs)
549 {
550 typedef duration<_Rep1, _Period1> __dur1;
551 typedef duration<_Rep2, _Period2> __dur2;
552 typedef typename common_type<__dur1,__dur2>::type __ct;
553 return __ct(__lhs).count() == __ct(__rhs).count();
554 }
555
556 template<typename _Rep1, typename _Period1,
557 typename _Rep2, typename _Period2>
558 constexpr bool
559 operator<(const duration<_Rep1, _Period1>& __lhs,
560 const duration<_Rep2, _Period2>& __rhs)
561 {
562 typedef duration<_Rep1, _Period1> __dur1;
563 typedef duration<_Rep2, _Period2> __dur2;
564 typedef typename common_type<__dur1,__dur2>::type __ct;
565 return __ct(__lhs).count() < __ct(__rhs).count();
566 }
567
568 template<typename _Rep1, typename _Period1,
569 typename _Rep2, typename _Period2>
570 constexpr bool
571 operator!=(const duration<_Rep1, _Period1>& __lhs,
572 const duration<_Rep2, _Period2>& __rhs)
573 { return !(__lhs == __rhs); }
574
575 template<typename _Rep1, typename _Period1,
576 typename _Rep2, typename _Period2>
577 constexpr bool
578 operator<=(const duration<_Rep1, _Period1>& __lhs,
579 const duration<_Rep2, _Period2>& __rhs)
580 { return !(__rhs < __lhs); }
581
582 template<typename _Rep1, typename _Period1,
583 typename _Rep2, typename _Period2>
584 constexpr bool
585 operator>(const duration<_Rep1, _Period1>& __lhs,
586 const duration<_Rep2, _Period2>& __rhs)
587 { return __rhs < __lhs; }
588
589 template<typename _Rep1, typename _Period1,
590 typename _Rep2, typename _Period2>
591 constexpr bool
592 operator>=(const duration<_Rep1, _Period1>& __lhs,
593 const duration<_Rep2, _Period2>& __rhs)
594 { return !(__lhs < __rhs); }
595
596 /// nanoseconds
597 typedef duration<int64_t, nano> nanoseconds;
598
599 /// microseconds
600 typedef duration<int64_t, micro> microseconds;
601
602 /// milliseconds
603 typedef duration<int64_t, milli> milliseconds;
604
605 /// seconds
606 typedef duration<int64_t> seconds;
607
608 /// minutes
609 typedef duration<int64_t, ratio< 60>> minutes;
610
611 /// hours
612 typedef duration<int64_t, ratio<3600>> hours;
613
614 /// time_point
615 template<typename _Clock, typename _Dur>
616 struct time_point
617 {
618 typedef _Clock clock;
619 typedef _Dur duration;
620 typedef typename duration::rep rep;
621 typedef typename duration::period period;
622
623 constexpr time_point() : __d(duration::zero())
624 { }
625
626 constexpr explicit time_point(const duration& __dur)
627 : __d(__dur)
628 { }
629
630 // conversions
631 template<typename _Dur2,
632 typename = _Require<is_convertible<_Dur2, _Dur>>>
633 constexpr time_point(const time_point<clock, _Dur2>& __t)
634 : __d(__t.time_since_epoch())
635 { }
636
637 // observer
638 constexpr duration
639 time_since_epoch() const
640 { return __d; }
641
642 // arithmetic
643 _GLIBCXX17_CONSTEXPR time_point&
644 operator+=(const duration& __dur)
645 {
646 __d += __dur;
647 return *this;
648 }
649
650 _GLIBCXX17_CONSTEXPR time_point&
651 operator-=(const duration& __dur)
652 {
653 __d -= __dur;
654 return *this;
655 }
656
657 // special values
658 static constexpr time_point
659 min()
660 { return time_point(duration::min()); }
661
662 static constexpr time_point
663 max()
664 { return time_point(duration::max()); }
665
666 private:
667 duration __d;
668 };
669
670 /// time_point_cast
671 template<typename _ToDur, typename _Clock, typename _Dur>
672 constexpr typename enable_if<__is_duration<_ToDur>::value,
673 time_point<_Clock, _ToDur>>::type
674 time_point_cast(const time_point<_Clock, _Dur>& __t)
675 {
676 typedef time_point<_Clock, _ToDur> __time_point;
677 return __time_point(duration_cast<_ToDur>(__t.time_since_epoch()));
678 }
679
680#if __cplusplus > 201402L
681 template<typename _ToDur, typename _Clock, typename _Dur>
682 constexpr
683 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
684 floor(const time_point<_Clock, _Dur>& __tp)
685 {
686 return time_point<_Clock, _ToDur>{
687 chrono::floor<_ToDur>(__tp.time_since_epoch())};
688 }
689
690 template<typename _ToDur, typename _Clock, typename _Dur>
691 constexpr
692 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
693 ceil(const time_point<_Clock, _Dur>& __tp)
694 {
695 return time_point<_Clock, _ToDur>{
696 chrono::ceil<_ToDur>(__tp.time_since_epoch())};
697 }
698
699 template<typename _ToDur, typename _Clock, typename _Dur>
700 constexpr enable_if_t<
701 __and_<__is_duration<_ToDur>,
702 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
703 time_point<_Clock, _ToDur>>
704 round(const time_point<_Clock, _Dur>& __tp)
705 {
706 return time_point<_Clock, _ToDur>{
707 chrono::round<_ToDur>(__tp.time_since_epoch())};
708 }
709#endif // C++17
710
711 template<typename _Clock, typename _Dur1,
712 typename _Rep2, typename _Period2>
713 constexpr time_point<_Clock,
714 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
715 operator+(const time_point<_Clock, _Dur1>& __lhs,
716 const duration<_Rep2, _Period2>& __rhs)
717 {
718 typedef duration<_Rep2, _Period2> __dur2;
719 typedef typename common_type<_Dur1,__dur2>::type __ct;
720 typedef time_point<_Clock, __ct> __time_point;
721 return __time_point(__lhs.time_since_epoch() + __rhs);
722 }
723
724 template<typename _Rep1, typename _Period1,
725 typename _Clock, typename _Dur2>
726 constexpr time_point<_Clock,
727 typename common_type<duration<_Rep1, _Period1>, _Dur2>::type>
728 operator+(const duration<_Rep1, _Period1>& __lhs,
729 const time_point<_Clock, _Dur2>& __rhs)
730 {
731 typedef duration<_Rep1, _Period1> __dur1;
732 typedef typename common_type<__dur1,_Dur2>::type __ct;
733 typedef time_point<_Clock, __ct> __time_point;
734 return __time_point(__rhs.time_since_epoch() + __lhs);
735 }
736
737 template<typename _Clock, typename _Dur1,
738 typename _Rep2, typename _Period2>
739 constexpr time_point<_Clock,
740 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
741 operator-(const time_point<_Clock, _Dur1>& __lhs,
742 const duration<_Rep2, _Period2>& __rhs)
743 {
744 typedef duration<_Rep2, _Period2> __dur2;
745 typedef typename common_type<_Dur1,__dur2>::type __ct;
746 typedef time_point<_Clock, __ct> __time_point;
747 return __time_point(__lhs.time_since_epoch() -__rhs);
748 }
749
750 template<typename _Clock, typename _Dur1, typename _Dur2>
751 constexpr typename common_type<_Dur1, _Dur2>::type
752 operator-(const time_point<_Clock, _Dur1>& __lhs,
753 const time_point<_Clock, _Dur2>& __rhs)
754 { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
755
756 template<typename _Clock, typename _Dur1, typename _Dur2>
757 constexpr bool
758 operator==(const time_point<_Clock, _Dur1>& __lhs,
759 const time_point<_Clock, _Dur2>& __rhs)
760 { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
761
762 template<typename _Clock, typename _Dur1, typename _Dur2>
763 constexpr bool
764 operator!=(const time_point<_Clock, _Dur1>& __lhs,
765 const time_point<_Clock, _Dur2>& __rhs)
766 { return !(__lhs == __rhs); }
767
768 template<typename _Clock, typename _Dur1, typename _Dur2>
769 constexpr bool
770 operator<(const time_point<_Clock, _Dur1>& __lhs,
771 const time_point<_Clock, _Dur2>& __rhs)
772 { return __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
773
774 template<typename _Clock, typename _Dur1, typename _Dur2>
775 constexpr bool
776 operator<=(const time_point<_Clock, _Dur1>& __lhs,
777 const time_point<_Clock, _Dur2>& __rhs)
778 { return !(__rhs < __lhs); }
779
780 template<typename _Clock, typename _Dur1, typename _Dur2>
781 constexpr bool
782 operator>(const time_point<_Clock, _Dur1>& __lhs,
783 const time_point<_Clock, _Dur2>& __rhs)
784 { return __rhs < __lhs; }
785
786 template<typename _Clock, typename _Dur1, typename _Dur2>
787 constexpr bool
788 operator>=(const time_point<_Clock, _Dur1>& __lhs,
789 const time_point<_Clock, _Dur2>& __rhs)
790 { return !(__lhs < __rhs); }
791
792
793 // Clocks.
794
795 // Why nanosecond resolution as the default?
796 // Why have std::system_clock always count in the highest
797 // resolution (ie nanoseconds), even if on some OSes the low 3
798 // or 9 decimal digits will be always zero? This allows later
799 // implementations to change the system_clock::now()
800 // implementation any time to provide better resolution without
801 // changing function signature or units.
802
803 // To support the (forward) evolution of the library's defined
804 // clocks, wrap inside inline namespace so that the current
805 // defintions of system_clock, steady_clock, and
806 // high_resolution_clock types are uniquely mangled. This way, new
807 // code can use the latests clocks, while the library can contain
808 // compatibility definitions for previous versions. At some
809 // point, when these clocks settle down, the inlined namespaces
810 // can be removed. XXX GLIBCXX_ABI Deprecated
811 inline namespace _V2 {
812
813 /**
814 * @brief System clock.
815 *
816 * Time returned represents wall time from the system-wide clock.
817 */
818 struct system_clock
819 {
820 typedef chrono::nanoseconds duration;
821 typedef duration::rep rep;
822 typedef duration::period period;
823 typedef chrono::time_point<system_clock, duration> time_point;
824
825 static_assert(system_clock::duration::min()
826 < system_clock::duration::zero(),
827 "a clock's minimum duration cannot be less than its epoch");
828
829 static constexpr bool is_steady = false;
830
831 static time_point
832 now() noexcept;
833
834 // Map to C API
835 static std::time_t
836 to_time_t(const time_point& __t) noexcept
837 {
838 return std::time_t(duration_cast<chrono::seconds>
839 (__t.time_since_epoch()).count());
840 }
841
842 static time_point
843 from_time_t(std::time_t __t) noexcept
844 {
845 typedef chrono::time_point<system_clock, seconds> __from;
846 return time_point_cast<system_clock::duration>
847 (__from(chrono::seconds(__t)));
848 }
849 };
850
851
852 /**
853 * @brief Monotonic clock
854 *
855 * Time returned has the property of only increasing at a uniform rate.
856 */
857 struct steady_clock
858 {
859 typedef chrono::nanoseconds duration;
860 typedef duration::rep rep;
861 typedef duration::period period;
862 typedef chrono::time_point<steady_clock, duration> time_point;
863
864 static constexpr bool is_steady = true;
865
866 static time_point
867 now() noexcept;
868 };
869
870
871 /**
872 * @brief Highest-resolution clock
873 *
874 * This is the clock "with the shortest tick period." Alias to
875 * std::system_clock until higher-than-nanosecond definitions
876 * become feasible.
877 */
878 using high_resolution_clock = system_clock;
879
880 } // end inline namespace _V2
881
882 _GLIBCXX_END_NAMESPACE_VERSION
883 } // namespace chrono
884
885#if __cplusplus > 201103L
886
887#define __cpp_lib_chrono_udls 201304
888
889 inline namespace literals
890 {
891 inline namespace chrono_literals
892 {
893 _GLIBCXX_BEGIN_NAMESPACE_VERSION
894
895 template<typename _Rep, unsigned long long _Val>
896 struct _Checked_integral_constant
897 : integral_constant<_Rep, static_cast<_Rep>(_Val)>
898 {
899 static_assert(_Checked_integral_constant::value >= 0
900 && _Checked_integral_constant::value == _Val,
901 "literal value cannot be represented by duration type");
902 };
903
904 template<typename _Dur, char... _Digits>
905 constexpr _Dur __check_overflow()
906 {
907 using _Val = __parse_int::_Parse_int<_Digits...>;
908 using _Rep = typename _Dur::rep;
909 // TODO: should be simply integral_constant<_Rep, _Val::value>
910 // but GCC doesn't reject narrowing conversions to _Rep.
911 using _CheckedVal = _Checked_integral_constant<_Rep, _Val::value>;
912 return _Dur{_CheckedVal::value};
913 }
914
915 constexpr chrono::duration<long double, ratio<3600,1>>
916 operator""h(long double __hours)
917 { return chrono::duration<long double, ratio<3600,1>>{__hours}; }
918
919 template <char... _Digits>
920 constexpr chrono::hours
921 operator""h()
922 { return __check_overflow<chrono::hours, _Digits...>(); }
923
924 constexpr chrono::duration<long double, ratio<60,1>>
925 operator""min(long double __mins)
926 { return chrono::duration<long double, ratio<60,1>>{__mins}; }
927
928 template <char... _Digits>
929 constexpr chrono::minutes
930 operator""min()
931 { return __check_overflow<chrono::minutes, _Digits...>(); }
932
933 constexpr chrono::duration<long double>
934 operator""s(long double __secs)
935 { return chrono::duration<long double>{__secs}; }
936
937 template <char... _Digits>
938 constexpr chrono::seconds
939 operator""s()
940 { return __check_overflow<chrono::seconds, _Digits...>(); }
941
942 constexpr chrono::duration<long double, milli>
943 operator""ms(long double __msecs)
944 { return chrono::duration<long double, milli>{__msecs}; }
945
946 template <char... _Digits>
947 constexpr chrono::milliseconds
948 operator""ms()
949 { return __check_overflow<chrono::milliseconds, _Digits...>(); }
950
951 constexpr chrono::duration<long double, micro>
952 operator""us(long double __usecs)
953 { return chrono::duration<long double, micro>{__usecs}; }
954
955 template <char... _Digits>
956 constexpr chrono::microseconds
957 operator""us()
958 { return __check_overflow<chrono::microseconds, _Digits...>(); }
959
960 constexpr chrono::duration<long double, nano>
961 operator""ns(long double __nsecs)
962 { return chrono::duration<long double, nano>{__nsecs}; }
963
964 template <char... _Digits>
965 constexpr chrono::nanoseconds
966 operator""ns()
967 { return __check_overflow<chrono::nanoseconds, _Digits...>(); }
968
969 _GLIBCXX_END_NAMESPACE_VERSION
970 } // inline namespace chrono_literals
971 } // inline namespace literals
972
973 namespace chrono
974 {
975 _GLIBCXX_BEGIN_NAMESPACE_VERSION
976
977 using namespace literals::chrono_literals;
978
979 _GLIBCXX_END_NAMESPACE_VERSION
980 } // namespace chrono
981
982#endif // __cplusplus > 201103L
983
984 // @} group chrono
985} // namespace std
986
987#endif //_GLIBCXX_USE_C99_STDINT_TR1
988
989#endif // C++11
990
991#endif //_GLIBCXX_CHRONO
992