source: Daodan/MSYS2/mingw32/include/c++/11.2.0/chrono@ 1182

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1// <chrono> -*- C++ -*-
2
3// Copyright (C) 2008-2021 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 * @ingroup chrono
28 */
29
30#ifndef _GLIBCXX_CHRONO
31#define _GLIBCXX_CHRONO 1
32
33#pragma GCC system_header
34
35#if __cplusplus < 201103L
36# include <bits/c++0x_warning.h>
37#else
38
39#include <ratio>
40#include <type_traits>
41#include <limits>
42#include <ctime>
43#include <bits/parse_numbers.h> // for literals support.
44#if __cplusplus > 201703L
45# include <concepts>
46# include <compare>
47#endif
48
49namespace std _GLIBCXX_VISIBILITY(default)
50{
51_GLIBCXX_BEGIN_NAMESPACE_VERSION
52
53#if __cplusplus >= 201703L
54 namespace filesystem { struct __file_clock; };
55#endif
56
57 /**
58 * @defgroup chrono Time
59 * @ingroup utilities
60 *
61 * Classes and functions for time.
62 * @{
63 */
64
65 /** @namespace std::chrono
66 * @brief ISO C++ 2011 namespace for date and time utilities
67 */
68 namespace chrono
69 {
70 template<typename _Rep, typename _Period = ratio<1>>
71 struct duration;
72
73 template<typename _Clock, typename _Dur = typename _Clock::duration>
74 struct time_point;
75 }
76
77 // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
78
79 /// @cond undocumented
80
81 template<typename _CT, typename _Period1, typename _Period2, typename = void>
82 struct __duration_common_type
83 { };
84
85 template<typename _CT, typename _Period1, typename _Period2>
86 struct __duration_common_type<_CT, _Period1, _Period2,
87 __void_t<typename _CT::type>>
88 {
89 private:
90 using __gcd_num = __static_gcd<_Period1::num, _Period2::num>;
91 using __gcd_den = __static_gcd<_Period1::den, _Period2::den>;
92 using __cr = typename _CT::type;
93 using __r = ratio<__gcd_num::value,
94 (_Period1::den / __gcd_den::value) * _Period2::den>;
95
96 public:
97 using type = chrono::duration<__cr, typename __r::type>;
98 };
99
100 /// @endcond
101
102 /// Specialization of common_type for chrono::duration types.
103 /// @relates duration
104 template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
105 struct common_type<chrono::duration<_Rep1, _Period1>,
106 chrono::duration<_Rep2, _Period2>>
107 : __duration_common_type<common_type<_Rep1, _Rep2>,
108 typename _Period1::type,
109 typename _Period2::type>
110 { };
111
112 /// Specialization of common_type for two identical chrono::duration types.
113 /// @relates duration
114 template<typename _Rep, typename _Period>
115 struct common_type<chrono::duration<_Rep, _Period>,
116 chrono::duration<_Rep, _Period>>
117 {
118 using type = chrono::duration<typename common_type<_Rep>::type,
119 typename _Period::type>;
120 };
121
122 /// Specialization of common_type for one chrono::duration type.
123 /// @relates duration
124 template<typename _Rep, typename _Period>
125 struct common_type<chrono::duration<_Rep, _Period>>
126 {
127 using type = chrono::duration<typename common_type<_Rep>::type,
128 typename _Period::type>;
129 };
130
131 // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
132
133 /// @cond undocumented
134
135 template<typename _CT, typename _Clock, typename = void>
136 struct __timepoint_common_type
137 { };
138
139 template<typename _CT, typename _Clock>
140 struct __timepoint_common_type<_CT, _Clock, __void_t<typename _CT::type>>
141 {
142 using type = chrono::time_point<_Clock, typename _CT::type>;
143 };
144
145 /// @endcond
146
147 /// Specialization of common_type for chrono::time_point types.
148 /// @relates time_point
149 template<typename _Clock, typename _Duration1, typename _Duration2>
150 struct common_type<chrono::time_point<_Clock, _Duration1>,
151 chrono::time_point<_Clock, _Duration2>>
152 : __timepoint_common_type<common_type<_Duration1, _Duration2>, _Clock>
153 { };
154
155 /// Specialization of common_type for two identical chrono::time_point types.
156 /// @relates time_point
157 template<typename _Clock, typename _Duration>
158 struct common_type<chrono::time_point<_Clock, _Duration>,
159 chrono::time_point<_Clock, _Duration>>
160 { using type = chrono::time_point<_Clock, _Duration>; };
161
162 /// Specialization of common_type for one chrono::time_point type.
163 /// @relates time_point
164 template<typename _Clock, typename _Duration>
165 struct common_type<chrono::time_point<_Clock, _Duration>>
166 { using type = chrono::time_point<_Clock, _Duration>; };
167
168 /// @} group chrono
169
170 namespace chrono
171 {
172 /// @addtogroup chrono
173 /// @{
174
175 /// @cond undocumented
176
177 // Primary template for duration_cast impl.
178 template<typename _ToDur, typename _CF, typename _CR,
179 bool _NumIsOne = false, bool _DenIsOne = false>
180 struct __duration_cast_impl
181 {
182 template<typename _Rep, typename _Period>
183 static constexpr _ToDur
184 __cast(const duration<_Rep, _Period>& __d)
185 {
186 typedef typename _ToDur::rep __to_rep;
187 return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
188 * static_cast<_CR>(_CF::num)
189 / static_cast<_CR>(_CF::den)));
190 }
191 };
192
193 template<typename _ToDur, typename _CF, typename _CR>
194 struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
195 {
196 template<typename _Rep, typename _Period>
197 static constexpr _ToDur
198 __cast(const duration<_Rep, _Period>& __d)
199 {
200 typedef typename _ToDur::rep __to_rep;
201 return _ToDur(static_cast<__to_rep>(__d.count()));
202 }
203 };
204
205 template<typename _ToDur, typename _CF, typename _CR>
206 struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
207 {
208 template<typename _Rep, typename _Period>
209 static constexpr _ToDur
210 __cast(const duration<_Rep, _Period>& __d)
211 {
212 typedef typename _ToDur::rep __to_rep;
213 return _ToDur(static_cast<__to_rep>(
214 static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
215 }
216 };
217
218 template<typename _ToDur, typename _CF, typename _CR>
219 struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
220 {
221 template<typename _Rep, typename _Period>
222 static constexpr _ToDur
223 __cast(const duration<_Rep, _Period>& __d)
224 {
225 typedef typename _ToDur::rep __to_rep;
226 return _ToDur(static_cast<__to_rep>(
227 static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
228 }
229 };
230
231 template<typename _Tp>
232 struct __is_duration
233 : std::false_type
234 { };
235
236 template<typename _Rep, typename _Period>
237 struct __is_duration<duration<_Rep, _Period>>
238 : std::true_type
239 { };
240
241 template<typename _Tp>
242 using __enable_if_is_duration
243 = typename enable_if<__is_duration<_Tp>::value, _Tp>::type;
244
245 template<typename _Tp>
246 using __disable_if_is_duration
247 = typename enable_if<!__is_duration<_Tp>::value, _Tp>::type;
248
249 /// @endcond
250
251 /// duration_cast
252 template<typename _ToDur, typename _Rep, typename _Period>
253 constexpr __enable_if_is_duration<_ToDur>
254 duration_cast(const duration<_Rep, _Period>& __d)
255 {
256 typedef typename _ToDur::period __to_period;
257 typedef typename _ToDur::rep __to_rep;
258 typedef ratio_divide<_Period, __to_period> __cf;
259 typedef typename common_type<__to_rep, _Rep, intmax_t>::type
260 __cr;
261 typedef __duration_cast_impl<_ToDur, __cf, __cr,
262 __cf::num == 1, __cf::den == 1> __dc;
263 return __dc::__cast(__d);
264 }
265
266 /// treat_as_floating_point
267 template<typename _Rep>
268 struct treat_as_floating_point
269 : is_floating_point<_Rep>
270 { };
271
272#if __cplusplus > 201402L
273 template <typename _Rep>
274 inline constexpr bool treat_as_floating_point_v =
275 treat_as_floating_point<_Rep>::value;
276#endif // C++17
277
278#if __cplusplus > 201703L
279 template<typename _Tp>
280 struct is_clock;
281
282 template<typename _Tp>
283 inline constexpr bool is_clock_v = is_clock<_Tp>::value;
284
285#if __cpp_lib_concepts
286 template<typename _Tp>
287 struct is_clock : false_type
288 { };
289
290 template<typename _Tp>
291 requires requires {
292 typename _Tp::rep;
293 typename _Tp::period;
294 typename _Tp::duration;
295 typename _Tp::time_point::clock;
296 typename _Tp::time_point::duration;
297 { &_Tp::is_steady } -> same_as<const bool*>;
298 { _Tp::now() } -> same_as<typename _Tp::time_point>;
299 requires same_as<typename _Tp::duration,
300 duration<typename _Tp::rep, typename _Tp::period>>;
301 requires same_as<typename _Tp::time_point::duration,
302 typename _Tp::duration>;
303 }
304 struct is_clock<_Tp> : true_type
305 { };
306#else
307 template<typename _Tp, typename = void>
308 struct __is_clock_impl : false_type
309 { };
310
311 template<typename _Tp>
312 struct __is_clock_impl<_Tp,
313 void_t<typename _Tp::rep, typename _Tp::period,
314 typename _Tp::duration,
315 typename _Tp::time_point::duration,
316 decltype(_Tp::is_steady),
317 decltype(_Tp::now())>>
318 : __and_<is_same<typename _Tp::duration,
319 duration<typename _Tp::rep, typename _Tp::period>>,
320 is_same<typename _Tp::time_point::duration,
321 typename _Tp::duration>,
322 is_same<decltype(&_Tp::is_steady), const bool*>,
323 is_same<decltype(_Tp::now()), typename _Tp::time_point>>::type
324 { };
325
326 template<typename _Tp>
327 struct is_clock : __is_clock_impl<_Tp>::type
328 { };
329#endif
330#endif // C++20
331
332#if __cplusplus >= 201703L
333# define __cpp_lib_chrono 201611
334
335 template<typename _ToDur, typename _Rep, typename _Period>
336 constexpr __enable_if_is_duration<_ToDur>
337 floor(const duration<_Rep, _Period>& __d)
338 {
339 auto __to = chrono::duration_cast<_ToDur>(__d);
340 if (__to > __d)
341 return __to - _ToDur{1};
342 return __to;
343 }
344
345 template<typename _ToDur, typename _Rep, typename _Period>
346 constexpr __enable_if_is_duration<_ToDur>
347 ceil(const duration<_Rep, _Period>& __d)
348 {
349 auto __to = chrono::duration_cast<_ToDur>(__d);
350 if (__to < __d)
351 return __to + _ToDur{1};
352 return __to;
353 }
354
355 template <typename _ToDur, typename _Rep, typename _Period>
356 constexpr enable_if_t<
357 __and_<__is_duration<_ToDur>,
358 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
359 _ToDur>
360 round(const duration<_Rep, _Period>& __d)
361 {
362 _ToDur __t0 = chrono::floor<_ToDur>(__d);
363 _ToDur __t1 = __t0 + _ToDur{1};
364 auto __diff0 = __d - __t0;
365 auto __diff1 = __t1 - __d;
366 if (__diff0 == __diff1)
367 {
368 if (__t0.count() & 1)
369 return __t1;
370 return __t0;
371 }
372 else if (__diff0 < __diff1)
373 return __t0;
374 return __t1;
375 }
376
377 template<typename _Rep, typename _Period>
378 constexpr
379 enable_if_t<numeric_limits<_Rep>::is_signed, duration<_Rep, _Period>>
380 abs(duration<_Rep, _Period> __d)
381 {
382 if (__d >= __d.zero())
383 return __d;
384 return -__d;
385 }
386
387 // Make chrono::ceil<D> also usable as chrono::__detail::ceil<D>.
388 namespace __detail { using chrono::ceil; }
389
390#else // ! C++17
391
392 // We want to use ceil even when compiling for earlier standards versions.
393 // C++11 only allows a single statement in a constexpr function, so we
394 // need to move the comparison into a separate function, __ceil_impl.
395 namespace __detail
396 {
397 template<typename _Tp, typename _Up>
398 constexpr _Tp
399 __ceil_impl(const _Tp& __t, const _Up& __u)
400 {
401 return (__t < __u) ? (__t + _Tp{1}) : __t;
402 }
403
404 // C++11-friendly version of std::chrono::ceil<D> for internal use.
405 template<typename _ToDur, typename _Rep, typename _Period>
406 constexpr _ToDur
407 ceil(const duration<_Rep, _Period>& __d)
408 {
409 return __detail::__ceil_impl(chrono::duration_cast<_ToDur>(__d), __d);
410 }
411 }
412#endif // C++17
413
414 /// duration_values
415 template<typename _Rep>
416 struct duration_values
417 {
418 static constexpr _Rep
419 zero() noexcept
420 { return _Rep(0); }
421
422 static constexpr _Rep
423 max() noexcept
424 { return numeric_limits<_Rep>::max(); }
425
426 static constexpr _Rep
427 min() noexcept
428 { return numeric_limits<_Rep>::lowest(); }
429 };
430
431 /// @cond undocumented
432
433 template<typename _Tp>
434 struct __is_ratio
435 : std::false_type
436 { };
437
438 template<intmax_t _Num, intmax_t _Den>
439 struct __is_ratio<ratio<_Num, _Den>>
440 : std::true_type
441 { };
442
443 /// @endcond
444
445 /// duration
446 template<typename _Rep, typename _Period>
447 struct duration
448 {
449 private:
450 template<typename _Rep2>
451 using __is_float = treat_as_floating_point<_Rep2>;
452
453 static constexpr intmax_t
454 _S_gcd(intmax_t __m, intmax_t __n) noexcept
455 {
456 // Duration only allows positive periods so we don't need to
457 // handle negative values here (unlike __static_gcd and std::gcd).
458#if __cplusplus >= 201402L
459 do
460 {
461 intmax_t __rem = __m % __n;
462 __m = __n;
463 __n = __rem;
464 }
465 while (__n != 0);
466 return __m;
467#else
468 // C++11 doesn't allow loops in constexpr functions, but this
469 // recursive version can be more expensive to evaluate.
470 return (__n == 0) ? __m : _S_gcd(__n, __m % __n);
471#endif
472 }
473
474 // _GLIBCXX_RESOLVE_LIB_DEFECTS
475 // 2094. overflow shouldn't participate in overload resolution
476 // 3090. What is [2094] intended to mean?
477 // This only produces a valid type if no overflow occurs.
478 template<typename _R1, typename _R2,
479 intmax_t __gcd1 = _S_gcd(_R1::num, _R2::num),
480 intmax_t __gcd2 = _S_gcd(_R1::den, _R2::den)>
481 using __divide = ratio<(_R1::num / __gcd1) * (_R2::den / __gcd2),
482 (_R1::den / __gcd2) * (_R2::num / __gcd1)>;
483
484 // _Period2 is an exact multiple of _Period
485 template<typename _Period2>
486 using __is_harmonic
487 = __bool_constant<__divide<_Period2, _Period>::den == 1>;
488
489 public:
490
491 using rep = _Rep;
492 using period = typename _Period::type;
493
494 static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
495 static_assert(__is_ratio<_Period>::value,
496 "period must be a specialization of ratio");
497 static_assert(_Period::num > 0, "period must be positive");
498
499 // 20.11.5.1 construction / copy / destroy
500 constexpr duration() = default;
501
502 duration(const duration&) = default;
503
504 // _GLIBCXX_RESOLVE_LIB_DEFECTS
505 // 3050. Conversion specification problem in chrono::duration
506 template<typename _Rep2, typename = _Require<
507 is_convertible<const _Rep2&, rep>,
508 __or_<__is_float<rep>, __not_<__is_float<_Rep2>>>>>
509 constexpr explicit duration(const _Rep2& __rep)
510 : __r(static_cast<rep>(__rep)) { }
511
512 template<typename _Rep2, typename _Period2, typename = _Require<
513 is_convertible<const _Rep2&, rep>,
514 __or_<__is_float<rep>,
515 __and_<__is_harmonic<_Period2>,
516 __not_<__is_float<_Rep2>>>>>>
517 constexpr duration(const duration<_Rep2, _Period2>& __d)
518 : __r(duration_cast<duration>(__d).count()) { }
519
520 ~duration() = default;
521 duration& operator=(const duration&) = default;
522
523 // 20.11.5.2 observer
524 constexpr rep
525 count() const
526 { return __r; }
527
528 // 20.11.5.3 arithmetic
529
530 constexpr duration<typename common_type<rep>::type, period>
531 operator+() const
532 { return duration<typename common_type<rep>::type, period>(__r); }
533
534 constexpr duration<typename common_type<rep>::type, period>
535 operator-() const
536 { return duration<typename common_type<rep>::type, period>(-__r); }
537
538 _GLIBCXX17_CONSTEXPR duration&
539 operator++()
540 {
541 ++__r;
542 return *this;
543 }
544
545 _GLIBCXX17_CONSTEXPR duration
546 operator++(int)
547 { return duration(__r++); }
548
549 _GLIBCXX17_CONSTEXPR duration&
550 operator--()
551 {
552 --__r;
553 return *this;
554 }
555
556 _GLIBCXX17_CONSTEXPR duration
557 operator--(int)
558 { return duration(__r--); }
559
560 _GLIBCXX17_CONSTEXPR duration&
561 operator+=(const duration& __d)
562 {
563 __r += __d.count();
564 return *this;
565 }
566
567 _GLIBCXX17_CONSTEXPR duration&
568 operator-=(const duration& __d)
569 {
570 __r -= __d.count();
571 return *this;
572 }
573
574 _GLIBCXX17_CONSTEXPR duration&
575 operator*=(const rep& __rhs)
576 {
577 __r *= __rhs;
578 return *this;
579 }
580
581 _GLIBCXX17_CONSTEXPR duration&
582 operator/=(const rep& __rhs)
583 {
584 __r /= __rhs;
585 return *this;
586 }
587
588 // DR 934.
589 template<typename _Rep2 = rep>
590 _GLIBCXX17_CONSTEXPR
591 typename enable_if<!treat_as_floating_point<_Rep2>::value,
592 duration&>::type
593 operator%=(const rep& __rhs)
594 {
595 __r %= __rhs;
596 return *this;
597 }
598
599 template<typename _Rep2 = rep>
600 _GLIBCXX17_CONSTEXPR
601 typename enable_if<!treat_as_floating_point<_Rep2>::value,
602 duration&>::type
603 operator%=(const duration& __d)
604 {
605 __r %= __d.count();
606 return *this;
607 }
608
609 // 20.11.5.4 special values
610 static constexpr duration
611 zero() noexcept
612 { return duration(duration_values<rep>::zero()); }
613
614 static constexpr duration
615 min() noexcept
616 { return duration(duration_values<rep>::min()); }
617
618 static constexpr duration
619 max() noexcept
620 { return duration(duration_values<rep>::max()); }
621
622 private:
623 rep __r;
624 };
625
626 /// @relates duration @{
627
628 /// The sum of two durations.
629 template<typename _Rep1, typename _Period1,
630 typename _Rep2, typename _Period2>
631 constexpr typename common_type<duration<_Rep1, _Period1>,
632 duration<_Rep2, _Period2>>::type
633 operator+(const duration<_Rep1, _Period1>& __lhs,
634 const duration<_Rep2, _Period2>& __rhs)
635 {
636 typedef duration<_Rep1, _Period1> __dur1;
637 typedef duration<_Rep2, _Period2> __dur2;
638 typedef typename common_type<__dur1,__dur2>::type __cd;
639 return __cd(__cd(__lhs).count() + __cd(__rhs).count());
640 }
641
642 /// The difference between two durations.
643 template<typename _Rep1, typename _Period1,
644 typename _Rep2, typename _Period2>
645 constexpr typename common_type<duration<_Rep1, _Period1>,
646 duration<_Rep2, _Period2>>::type
647 operator-(const duration<_Rep1, _Period1>& __lhs,
648 const duration<_Rep2, _Period2>& __rhs)
649 {
650 typedef duration<_Rep1, _Period1> __dur1;
651 typedef duration<_Rep2, _Period2> __dur2;
652 typedef typename common_type<__dur1,__dur2>::type __cd;
653 return __cd(__cd(__lhs).count() - __cd(__rhs).count());
654 }
655
656 /// @}
657
658 /// @cond undocumented
659
660 // SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2
661 // is implicitly convertible to it.
662 // _GLIBCXX_RESOLVE_LIB_DEFECTS
663 // 3050. Conversion specification problem in chrono::duration constructor
664 template<typename _Rep1, typename _Rep2,
665 typename _CRep = typename common_type<_Rep1, _Rep2>::type>
666 using __common_rep_t = typename
667 enable_if<is_convertible<const _Rep2&, _CRep>::value, _CRep>::type;
668
669 /// @endcond
670
671 /// @relates duration @{
672
673 /// Multiply a duration by a scalar value.
674 template<typename _Rep1, typename _Period, typename _Rep2>
675 constexpr duration<__common_rep_t<_Rep1, _Rep2>, _Period>
676 operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
677 {
678 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
679 __cd;
680 return __cd(__cd(__d).count() * __s);
681 }
682
683 /// Multiply a duration by a scalar value.
684 template<typename _Rep1, typename _Rep2, typename _Period>
685 constexpr duration<__common_rep_t<_Rep2, _Rep1>, _Period>
686 operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
687 { return __d * __s; }
688
689 template<typename _Rep1, typename _Period, typename _Rep2>
690 constexpr
691 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period>
692 operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
693 {
694 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
695 __cd;
696 return __cd(__cd(__d).count() / __s);
697 }
698
699 template<typename _Rep1, typename _Period1,
700 typename _Rep2, typename _Period2>
701 constexpr typename common_type<_Rep1, _Rep2>::type
702 operator/(const duration<_Rep1, _Period1>& __lhs,
703 const duration<_Rep2, _Period2>& __rhs)
704 {
705 typedef duration<_Rep1, _Period1> __dur1;
706 typedef duration<_Rep2, _Period2> __dur2;
707 typedef typename common_type<__dur1,__dur2>::type __cd;
708 return __cd(__lhs).count() / __cd(__rhs).count();
709 }
710
711 // DR 934.
712 template<typename _Rep1, typename _Period, typename _Rep2>
713 constexpr
714 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period>
715 operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
716 {
717 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
718 __cd;
719 return __cd(__cd(__d).count() % __s);
720 }
721
722 template<typename _Rep1, typename _Period1,
723 typename _Rep2, typename _Period2>
724 constexpr typename common_type<duration<_Rep1, _Period1>,
725 duration<_Rep2, _Period2>>::type
726 operator%(const duration<_Rep1, _Period1>& __lhs,
727 const duration<_Rep2, _Period2>& __rhs)
728 {
729 typedef duration<_Rep1, _Period1> __dur1;
730 typedef duration<_Rep2, _Period2> __dur2;
731 typedef typename common_type<__dur1,__dur2>::type __cd;
732 return __cd(__cd(__lhs).count() % __cd(__rhs).count());
733 }
734
735 // comparisons
736
737 template<typename _Rep1, typename _Period1,
738 typename _Rep2, typename _Period2>
739 constexpr bool
740 operator==(const duration<_Rep1, _Period1>& __lhs,
741 const duration<_Rep2, _Period2>& __rhs)
742 {
743 typedef duration<_Rep1, _Period1> __dur1;
744 typedef duration<_Rep2, _Period2> __dur2;
745 typedef typename common_type<__dur1,__dur2>::type __ct;
746 return __ct(__lhs).count() == __ct(__rhs).count();
747 }
748
749 template<typename _Rep1, typename _Period1,
750 typename _Rep2, typename _Period2>
751 constexpr bool
752 operator<(const duration<_Rep1, _Period1>& __lhs,
753 const duration<_Rep2, _Period2>& __rhs)
754 {
755 typedef duration<_Rep1, _Period1> __dur1;
756 typedef duration<_Rep2, _Period2> __dur2;
757 typedef typename common_type<__dur1,__dur2>::type __ct;
758 return __ct(__lhs).count() < __ct(__rhs).count();
759 }
760
761#if __cpp_lib_three_way_comparison
762 template<typename _Rep1, typename _Period1,
763 typename _Rep2, typename _Period2>
764 requires three_way_comparable<common_type_t<_Rep1, _Rep2>>
765 constexpr auto
766 operator<=>(const duration<_Rep1, _Period1>& __lhs,
767 const duration<_Rep2, _Period2>& __rhs)
768 {
769 using __ct = common_type_t<duration<_Rep1, _Period1>,
770 duration<_Rep2, _Period2>>;
771 return __ct(__lhs).count() <=> __ct(__rhs).count();
772 }
773#else
774 template<typename _Rep1, typename _Period1,
775 typename _Rep2, typename _Period2>
776 constexpr bool
777 operator!=(const duration<_Rep1, _Period1>& __lhs,
778 const duration<_Rep2, _Period2>& __rhs)
779 { return !(__lhs == __rhs); }
780#endif
781
782 template<typename _Rep1, typename _Period1,
783 typename _Rep2, typename _Period2>
784 constexpr bool
785 operator<=(const duration<_Rep1, _Period1>& __lhs,
786 const duration<_Rep2, _Period2>& __rhs)
787 { return !(__rhs < __lhs); }
788
789 template<typename _Rep1, typename _Period1,
790 typename _Rep2, typename _Period2>
791 constexpr bool
792 operator>(const duration<_Rep1, _Period1>& __lhs,
793 const duration<_Rep2, _Period2>& __rhs)
794 { return __rhs < __lhs; }
795
796 template<typename _Rep1, typename _Period1,
797 typename _Rep2, typename _Period2>
798 constexpr bool
799 operator>=(const duration<_Rep1, _Period1>& __lhs,
800 const duration<_Rep2, _Period2>& __rhs)
801 { return !(__lhs < __rhs); }
802
803 /// @}
804
805#ifdef _GLIBCXX_USE_C99_STDINT_TR1
806# define _GLIBCXX_CHRONO_INT64_T int64_t
807#elif defined __INT64_TYPE__
808# define _GLIBCXX_CHRONO_INT64_T __INT64_TYPE__
809#else
810 static_assert(std::numeric_limits<unsigned long long>::digits >= 64,
811 "Representation type for nanoseconds must have at least 64 bits");
812# define _GLIBCXX_CHRONO_INT64_T long long
813#endif
814
815 /// nanoseconds
816 using nanoseconds = duration<_GLIBCXX_CHRONO_INT64_T, nano>;
817
818 /// microseconds
819 using microseconds = duration<_GLIBCXX_CHRONO_INT64_T, micro>;
820
821 /// milliseconds
822 using milliseconds = duration<_GLIBCXX_CHRONO_INT64_T, milli>;
823
824 /// seconds
825 using seconds = duration<_GLIBCXX_CHRONO_INT64_T>;
826
827 /// minutes
828 using minutes = duration<_GLIBCXX_CHRONO_INT64_T, ratio< 60>>;
829
830 /// hours
831 using hours = duration<_GLIBCXX_CHRONO_INT64_T, ratio<3600>>;
832
833#if __cplusplus > 201703L
834 /// days
835 using days = duration<_GLIBCXX_CHRONO_INT64_T, ratio<86400>>;
836
837 /// weeks
838 using weeks = duration<_GLIBCXX_CHRONO_INT64_T, ratio<604800>>;
839
840 /// years
841 using years = duration<_GLIBCXX_CHRONO_INT64_T, ratio<31556952>>;
842
843 /// months
844 using months = duration<_GLIBCXX_CHRONO_INT64_T, ratio<2629746>>;
845#endif // C++20
846
847#undef _GLIBCXX_CHRONO_INT64_T
848
849 /// time_point
850 template<typename _Clock, typename _Dur>
851 struct time_point
852 {
853 static_assert(__is_duration<_Dur>::value,
854 "duration must be a specialization of std::chrono::duration");
855
856 typedef _Clock clock;
857 typedef _Dur duration;
858 typedef typename duration::rep rep;
859 typedef typename duration::period period;
860
861 constexpr time_point() : __d(duration::zero())
862 { }
863
864 constexpr explicit time_point(const duration& __dur)
865 : __d(__dur)
866 { }
867
868 // conversions
869 template<typename _Dur2,
870 typename = _Require<is_convertible<_Dur2, _Dur>>>
871 constexpr time_point(const time_point<clock, _Dur2>& __t)
872 : __d(__t.time_since_epoch())
873 { }
874
875 // observer
876 constexpr duration
877 time_since_epoch() const
878 { return __d; }
879
880#if __cplusplus > 201703L
881 constexpr time_point&
882 operator++()
883 {
884 ++__d;
885 return *this;
886 }
887
888 constexpr time_point
889 operator++(int)
890 { return time_point{__d++}; }
891
892 constexpr time_point&
893 operator--()
894 {
895 --__d;
896 return *this;
897 }
898
899 constexpr time_point
900 operator--(int)
901 { return time_point{__d--}; }
902#endif
903
904 // arithmetic
905 _GLIBCXX17_CONSTEXPR time_point&
906 operator+=(const duration& __dur)
907 {
908 __d += __dur;
909 return *this;
910 }
911
912 _GLIBCXX17_CONSTEXPR time_point&
913 operator-=(const duration& __dur)
914 {
915 __d -= __dur;
916 return *this;
917 }
918
919 // special values
920 static constexpr time_point
921 min() noexcept
922 { return time_point(duration::min()); }
923
924 static constexpr time_point
925 max() noexcept
926 { return time_point(duration::max()); }
927
928 private:
929 duration __d;
930 };
931
932 /// time_point_cast
933 template<typename _ToDur, typename _Clock, typename _Dur>
934 constexpr typename enable_if<__is_duration<_ToDur>::value,
935 time_point<_Clock, _ToDur>>::type
936 time_point_cast(const time_point<_Clock, _Dur>& __t)
937 {
938 typedef time_point<_Clock, _ToDur> __time_point;
939 return __time_point(duration_cast<_ToDur>(__t.time_since_epoch()));
940 }
941
942#if __cplusplus > 201402L
943 template<typename _ToDur, typename _Clock, typename _Dur>
944 constexpr
945 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
946 floor(const time_point<_Clock, _Dur>& __tp)
947 {
948 return time_point<_Clock, _ToDur>{
949 chrono::floor<_ToDur>(__tp.time_since_epoch())};
950 }
951
952 template<typename _ToDur, typename _Clock, typename _Dur>
953 constexpr
954 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
955 ceil(const time_point<_Clock, _Dur>& __tp)
956 {
957 return time_point<_Clock, _ToDur>{
958 chrono::ceil<_ToDur>(__tp.time_since_epoch())};
959 }
960
961 template<typename _ToDur, typename _Clock, typename _Dur>
962 constexpr enable_if_t<
963 __and_<__is_duration<_ToDur>,
964 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
965 time_point<_Clock, _ToDur>>
966 round(const time_point<_Clock, _Dur>& __tp)
967 {
968 return time_point<_Clock, _ToDur>{
969 chrono::round<_ToDur>(__tp.time_since_epoch())};
970 }
971#endif // C++17
972
973 /// @relates time_point @{
974
975 /// Adjust a time point forwards by the given duration.
976 template<typename _Clock, typename _Dur1,
977 typename _Rep2, typename _Period2>
978 constexpr time_point<_Clock,
979 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
980 operator+(const time_point<_Clock, _Dur1>& __lhs,
981 const duration<_Rep2, _Period2>& __rhs)
982 {
983 typedef duration<_Rep2, _Period2> __dur2;
984 typedef typename common_type<_Dur1,__dur2>::type __ct;
985 typedef time_point<_Clock, __ct> __time_point;
986 return __time_point(__lhs.time_since_epoch() + __rhs);
987 }
988
989 /// Adjust a time point forwards by the given duration.
990 template<typename _Rep1, typename _Period1,
991 typename _Clock, typename _Dur2>
992 constexpr time_point<_Clock,
993 typename common_type<duration<_Rep1, _Period1>, _Dur2>::type>
994 operator+(const duration<_Rep1, _Period1>& __lhs,
995 const time_point<_Clock, _Dur2>& __rhs)
996 {
997 typedef duration<_Rep1, _Period1> __dur1;
998 typedef typename common_type<__dur1,_Dur2>::type __ct;
999 typedef time_point<_Clock, __ct> __time_point;
1000 return __time_point(__rhs.time_since_epoch() + __lhs);
1001 }
1002
1003 /// Adjust a time point backwards by the given duration.
1004 template<typename _Clock, typename _Dur1,
1005 typename _Rep2, typename _Period2>
1006 constexpr time_point<_Clock,
1007 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
1008 operator-(const time_point<_Clock, _Dur1>& __lhs,
1009 const duration<_Rep2, _Period2>& __rhs)
1010 {
1011 typedef duration<_Rep2, _Period2> __dur2;
1012 typedef typename common_type<_Dur1,__dur2>::type __ct;
1013 typedef time_point<_Clock, __ct> __time_point;
1014 return __time_point(__lhs.time_since_epoch() -__rhs);
1015 }
1016
1017 /// @}
1018
1019 /// @relates time_point @{
1020
1021 /// The difference between two time points (as a duration)
1022 template<typename _Clock, typename _Dur1, typename _Dur2>
1023 constexpr typename common_type<_Dur1, _Dur2>::type
1024 operator-(const time_point<_Clock, _Dur1>& __lhs,
1025 const time_point<_Clock, _Dur2>& __rhs)
1026 { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
1027
1028 template<typename _Clock, typename _Dur1, typename _Dur2>
1029 constexpr bool
1030 operator==(const time_point<_Clock, _Dur1>& __lhs,
1031 const time_point<_Clock, _Dur2>& __rhs)
1032 { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
1033
1034#if __cpp_lib_three_way_comparison
1035 template<typename _Clock, typename _Dur1,
1036 three_way_comparable_with<_Dur1> _Dur2>
1037 constexpr auto
1038 operator<=>(const time_point<_Clock, _Dur1>& __lhs,
1039 const time_point<_Clock, _Dur2>& __rhs)
1040 { return __lhs.time_since_epoch() <=> __rhs.time_since_epoch(); }
1041#else
1042 template<typename _Clock, typename _Dur1, typename _Dur2>
1043 constexpr bool
1044 operator!=(const time_point<_Clock, _Dur1>& __lhs,
1045 const time_point<_Clock, _Dur2>& __rhs)
1046 { return !(__lhs == __rhs); }
1047#endif
1048
1049 template<typename _Clock, typename _Dur1, typename _Dur2>
1050 constexpr bool
1051 operator<(const time_point<_Clock, _Dur1>& __lhs,
1052 const time_point<_Clock, _Dur2>& __rhs)
1053 { return __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
1054
1055 template<typename _Clock, typename _Dur1, typename _Dur2>
1056 constexpr bool
1057 operator<=(const time_point<_Clock, _Dur1>& __lhs,
1058 const time_point<_Clock, _Dur2>& __rhs)
1059 { return !(__rhs < __lhs); }
1060
1061 template<typename _Clock, typename _Dur1, typename _Dur2>
1062 constexpr bool
1063 operator>(const time_point<_Clock, _Dur1>& __lhs,
1064 const time_point<_Clock, _Dur2>& __rhs)
1065 { return __rhs < __lhs; }
1066
1067 template<typename _Clock, typename _Dur1, typename _Dur2>
1068 constexpr bool
1069 operator>=(const time_point<_Clock, _Dur1>& __lhs,
1070 const time_point<_Clock, _Dur2>& __rhs)
1071 { return !(__lhs < __rhs); }
1072
1073 /// @}
1074
1075 // Clocks.
1076
1077 // Why nanosecond resolution as the default?
1078 // Why have std::system_clock always count in the highest
1079 // resolution (ie nanoseconds), even if on some OSes the low 3
1080 // or 9 decimal digits will be always zero? This allows later
1081 // implementations to change the system_clock::now()
1082 // implementation any time to provide better resolution without
1083 // changing function signature or units.
1084
1085 // To support the (forward) evolution of the library's defined
1086 // clocks, wrap inside inline namespace so that the current
1087 // defintions of system_clock, steady_clock, and
1088 // high_resolution_clock types are uniquely mangled. This way, new
1089 // code can use the latests clocks, while the library can contain
1090 // compatibility definitions for previous versions. At some
1091 // point, when these clocks settle down, the inlined namespaces
1092 // can be removed. XXX GLIBCXX_ABI Deprecated
1093 inline namespace _V2 {
1094
1095 /**
1096 * @brief System clock.
1097 *
1098 * Time returned represents wall time from the system-wide clock.
1099 * @ingroup chrono
1100 */
1101 struct system_clock
1102 {
1103 typedef chrono::nanoseconds duration;
1104 typedef duration::rep rep;
1105 typedef duration::period period;
1106 typedef chrono::time_point<system_clock, duration> time_point;
1107
1108 static_assert(system_clock::duration::min()
1109 < system_clock::duration::zero(),
1110 "a clock's minimum duration cannot be less than its epoch");
1111
1112 static constexpr bool is_steady = false;
1113
1114 static time_point
1115 now() noexcept;
1116
1117 // Map to C API
1118 static std::time_t
1119 to_time_t(const time_point& __t) noexcept
1120 {
1121 return std::time_t(duration_cast<chrono::seconds>
1122 (__t.time_since_epoch()).count());
1123 }
1124
1125 static time_point
1126 from_time_t(std::time_t __t) noexcept
1127 {
1128 typedef chrono::time_point<system_clock, seconds> __from;
1129 return time_point_cast<system_clock::duration>
1130 (__from(chrono::seconds(__t)));
1131 }
1132 };
1133
1134
1135 /**
1136 * @brief Monotonic clock
1137 *
1138 * Time returned has the property of only increasing at a uniform rate.
1139 * @ingroup chrono
1140 */
1141 struct steady_clock
1142 {
1143 typedef chrono::nanoseconds duration;
1144 typedef duration::rep rep;
1145 typedef duration::period period;
1146 typedef chrono::time_point<steady_clock, duration> time_point;
1147
1148 static constexpr bool is_steady = true;
1149
1150 static time_point
1151 now() noexcept;
1152 };
1153
1154
1155 /**
1156 * @brief Highest-resolution clock
1157 *
1158 * This is the clock "with the shortest tick period." Alias to
1159 * std::system_clock until higher-than-nanosecond definitions
1160 * become feasible.
1161 * @ingroup chrono
1162 */
1163 using high_resolution_clock = system_clock;
1164
1165 } // end inline namespace _V2
1166
1167#if __cplusplus > 201703L
1168 template<typename _Duration>
1169 using sys_time = time_point<system_clock, _Duration>;
1170 using sys_seconds = sys_time<seconds>;
1171 using sys_days = sys_time<days>;
1172
1173 using file_clock = ::std::filesystem::__file_clock;
1174
1175 template<typename _Duration>
1176 using file_time = time_point<file_clock, _Duration>;
1177
1178 template<> struct is_clock<system_clock> : true_type { };
1179 template<> struct is_clock<steady_clock> : true_type { };
1180 template<> struct is_clock<file_clock> : true_type { };
1181
1182 template<> inline constexpr bool is_clock_v<system_clock> = true;
1183 template<> inline constexpr bool is_clock_v<steady_clock> = true;
1184 template<> inline constexpr bool is_clock_v<file_clock> = true;
1185
1186 struct local_t { };
1187 template<typename _Duration>
1188 using local_time = time_point<local_t, _Duration>;
1189 using local_seconds = local_time<seconds>;
1190 using local_days = local_time<days>;
1191
1192 class utc_clock;
1193 class tai_clock;
1194 class gps_clock;
1195
1196 template<typename _Duration>
1197 using utc_time = time_point<utc_clock, _Duration>;
1198 using utc_seconds = utc_time<seconds>;
1199
1200 template<typename _Duration>
1201 using tai_time = time_point<tai_clock, _Duration>;
1202 using tai_seconds = tai_time<seconds>;
1203
1204 template<typename _Duration>
1205 using gps_time = time_point<gps_clock, _Duration>;
1206 using gps_seconds = gps_time<seconds>;
1207
1208 template<> struct is_clock<utc_clock> : true_type { };
1209 template<> struct is_clock<tai_clock> : true_type { };
1210 template<> struct is_clock<gps_clock> : true_type { };
1211
1212 template<> inline constexpr bool is_clock_v<utc_clock> = true;
1213 template<> inline constexpr bool is_clock_v<tai_clock> = true;
1214 template<> inline constexpr bool is_clock_v<gps_clock> = true;
1215
1216 struct leap_second_info
1217 {
1218 bool is_leap_second;
1219 seconds elapsed;
1220 };
1221
1222 // CALENDRICAL TYPES
1223
1224 // CLASS DECLARATIONS
1225 class day;
1226 class month;
1227 class year;
1228 class weekday;
1229 class weekday_indexed;
1230 class weekday_last;
1231 class month_day;
1232 class month_day_last;
1233 class month_weekday;
1234 class month_weekday_last;
1235 class year_month;
1236 class year_month_day;
1237 class year_month_day_last;
1238 class year_month_weekday;
1239 class year_month_weekday_last;
1240
1241 struct last_spec
1242 {
1243 explicit last_spec() = default;
1244
1245 friend constexpr month_day_last
1246 operator/(int __m, last_spec) noexcept;
1247
1248 friend constexpr month_day_last
1249 operator/(last_spec, int __m) noexcept;
1250 };
1251
1252 inline constexpr last_spec last{};
1253
1254 namespace __detail
1255 {
1256 // Compute the remainder of the Euclidean division of __n divided by __d.
1257 // Euclidean division truncates toward negative infinity and always
1258 // produces a remainder in the range of [0,__d-1] (whereas standard
1259 // division truncates toward zero and yields a nonpositive remainder
1260 // for negative __n).
1261 constexpr unsigned
1262 __modulo(long long __n, unsigned __d)
1263 {
1264 if (__n >= 0)
1265 return __n % __d;
1266 else
1267 return (__d + (__n % __d)) % __d;
1268 }
1269
1270 inline constexpr unsigned __days_per_month[12]
1271 = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
1272 }
1273
1274 // DAY
1275
1276 class day
1277 {
1278 private:
1279 unsigned char _M_d;
1280
1281 public:
1282 day() = default;
1283
1284 explicit constexpr
1285 day(unsigned __d) noexcept
1286 : _M_d(__d)
1287 { }
1288
1289 constexpr day&
1290 operator++() noexcept
1291 {
1292 ++_M_d;
1293 return *this;
1294 }
1295
1296 constexpr day
1297 operator++(int) noexcept
1298 {
1299 auto __ret = *this;
1300 ++(*this);
1301 return __ret;
1302 }
1303
1304 constexpr day&
1305 operator--() noexcept
1306 {
1307 --_M_d;
1308 return *this;
1309 }
1310
1311 constexpr day
1312 operator--(int) noexcept
1313 {
1314 auto __ret = *this;
1315 --(*this);
1316 return __ret;
1317 }
1318
1319 constexpr day&
1320 operator+=(const days& __d) noexcept
1321 {
1322 *this = *this + __d;
1323 return *this;
1324 }
1325
1326 constexpr day&
1327 operator-=(const days& __d) noexcept
1328 {
1329 *this = *this - __d;
1330 return *this;
1331 }
1332
1333 constexpr explicit
1334 operator unsigned() const noexcept
1335 { return _M_d; }
1336
1337 constexpr bool
1338 ok() const noexcept
1339 { return 1 <= _M_d && _M_d <= 31; }
1340
1341 friend constexpr bool
1342 operator==(const day& __x, const day& __y) noexcept
1343 { return unsigned{__x} == unsigned{__y}; }
1344
1345 friend constexpr strong_ordering
1346 operator<=>(const day& __x, const day& __y) noexcept
1347 { return unsigned{__x} <=> unsigned{__y}; }
1348
1349 friend constexpr day
1350 operator+(const day& __x, const days& __y) noexcept
1351 { return day(unsigned{__x} + __y.count()); }
1352
1353 friend constexpr day
1354 operator+(const days& __x, const day& __y) noexcept
1355 { return __y + __x; }
1356
1357 friend constexpr day
1358 operator-(const day& __x, const days& __y) noexcept
1359 { return __x + -__y; }
1360
1361 friend constexpr days
1362 operator-(const day& __x, const day& __y) noexcept
1363 { return days{int(unsigned{__x}) - int(unsigned{__y})}; }
1364
1365 friend constexpr month_day
1366 operator/(const month& __m, const day& __d) noexcept;
1367
1368 friend constexpr month_day
1369 operator/(int __m, const day& __d) noexcept;
1370
1371 friend constexpr month_day
1372 operator/(const day& __d, const month& __m) noexcept;
1373
1374 friend constexpr month_day
1375 operator/(const day& __d, int __m) noexcept;
1376
1377 friend constexpr year_month_day
1378 operator/(const year_month& __ym, const day& __d) noexcept;
1379
1380 // TODO: Implement operator<<, to_stream, from_stream.
1381 };
1382
1383 // MONTH
1384
1385 class month
1386 {
1387 private:
1388 unsigned char _M_m;
1389
1390 public:
1391 month() = default;
1392
1393 explicit constexpr
1394 month(unsigned __m) noexcept
1395 : _M_m(__m)
1396 { }
1397
1398 constexpr month&
1399 operator++() noexcept
1400 {
1401 *this += months{1};
1402 return *this;
1403 }
1404
1405 constexpr month
1406 operator++(int) noexcept
1407 {
1408 auto __ret = *this;
1409 ++(*this);
1410 return __ret;
1411 }
1412
1413 constexpr month&
1414 operator--() noexcept
1415 {
1416 *this -= months{1};
1417 return *this;
1418 }
1419
1420 constexpr month
1421 operator--(int) noexcept
1422 {
1423 auto __ret = *this;
1424 --(*this);
1425 return __ret;
1426 }
1427
1428 constexpr month&
1429 operator+=(const months& __m) noexcept
1430 {
1431 *this = *this + __m;
1432 return *this;
1433 }
1434
1435 constexpr month&
1436 operator-=(const months& __m) noexcept
1437 {
1438 *this = *this - __m;
1439 return *this;
1440 }
1441
1442 explicit constexpr
1443 operator unsigned() const noexcept
1444 { return _M_m; }
1445
1446 constexpr bool
1447 ok() const noexcept
1448 { return 1 <= _M_m && _M_m <= 12; }
1449
1450 friend constexpr bool
1451 operator==(const month& __x, const month& __y) noexcept
1452 { return unsigned{__x} == unsigned{__y}; }
1453
1454 friend constexpr strong_ordering
1455 operator<=>(const month& __x, const month& __y) noexcept
1456 { return unsigned{__x} <=> unsigned{__y}; }
1457
1458 friend constexpr month
1459 operator+(const month& __x, const months& __y) noexcept
1460 {
1461 auto __n = static_cast<long long>(unsigned{__x}) + (__y.count() - 1);
1462 return month{__detail::__modulo(__n, 12) + 1};
1463 }
1464
1465 friend constexpr month
1466 operator+(const months& __x, const month& __y) noexcept
1467 { return __y + __x; }
1468
1469 friend constexpr month
1470 operator-(const month& __x, const months& __y) noexcept
1471 { return __x + -__y; }
1472
1473 friend constexpr months
1474 operator-(const month& __x, const month& __y) noexcept
1475 {
1476 const auto __dm = int(unsigned(__x)) - int(unsigned(__y));
1477 return months{__dm < 0 ? 12 + __dm : __dm};
1478 }
1479
1480 friend constexpr year_month
1481 operator/(const year& __y, const month& __m) noexcept;
1482
1483 friend constexpr month_day
1484 operator/(const month& __m, int __d) noexcept;
1485
1486 friend constexpr month_day_last
1487 operator/(const month& __m, last_spec) noexcept;
1488
1489 friend constexpr month_day_last
1490 operator/(last_spec, const month& __m) noexcept;
1491
1492 friend constexpr month_weekday
1493 operator/(const month& __m, const weekday_indexed& __wdi) noexcept;
1494
1495 friend constexpr month_weekday
1496 operator/(const weekday_indexed& __wdi, const month& __m) noexcept;
1497
1498 friend constexpr month_weekday_last
1499 operator/(const month& __m, const weekday_last& __wdl) noexcept;
1500
1501 friend constexpr month_weekday_last
1502 operator/(const weekday_last& __wdl, const month& __m) noexcept;
1503
1504 // TODO: Implement operator<<, to_stream, from_stream.
1505 };
1506
1507 inline constexpr month January{1};
1508 inline constexpr month February{2};
1509 inline constexpr month March{3};
1510 inline constexpr month April{4};
1511 inline constexpr month May{5};
1512 inline constexpr month June{6};
1513 inline constexpr month July{7};
1514 inline constexpr month August{8};
1515 inline constexpr month September{9};
1516 inline constexpr month October{10};
1517 inline constexpr month November{11};
1518 inline constexpr month December{12};
1519
1520 // YEAR
1521
1522 class year
1523 {
1524 private:
1525 short _M_y;
1526
1527 public:
1528 year() = default;
1529
1530 explicit constexpr
1531 year(int __y) noexcept
1532 : _M_y{static_cast<short>(__y)}
1533 { }
1534
1535 static constexpr year
1536 min() noexcept
1537 { return year{-32767}; }
1538
1539 static constexpr year
1540 max() noexcept
1541 { return year{32767}; }
1542
1543 constexpr year&
1544 operator++() noexcept
1545 {
1546 ++_M_y;
1547 return *this;
1548 }
1549
1550 constexpr year
1551 operator++(int) noexcept
1552 {
1553 auto __ret = *this;
1554 ++(*this);
1555 return __ret;
1556 }
1557
1558 constexpr year&
1559 operator--() noexcept
1560 {
1561 --_M_y;
1562 return *this;
1563 }
1564
1565 constexpr year
1566 operator--(int) noexcept
1567 {
1568 auto __ret = *this;
1569 --(*this);
1570 return __ret;
1571 }
1572
1573 constexpr year&
1574 operator+=(const years& __y) noexcept
1575 {
1576 *this = *this + __y;
1577 return *this;
1578 }
1579
1580 constexpr year&
1581 operator-=(const years& __y) noexcept
1582 {
1583 *this = *this - __y;
1584 return *this;
1585 }
1586
1587 constexpr year
1588 operator+() const noexcept
1589 { return *this; }
1590
1591 constexpr year
1592 operator-() const noexcept
1593 { return year{-_M_y}; }
1594
1595 constexpr bool
1596 is_leap() const noexcept
1597 {
1598 // Testing divisibility by 100 first gives better performance, that is,
1599 // return (_M_y % 100 != 0 || _M_y % 400 == 0) && _M_y % 4 == 0;
1600
1601 // It gets even faster if _M_y is in [-536870800, 536870999]
1602 // (which is the case here) and _M_y % 100 is replaced by
1603 // __is_multiple_of_100 below.
1604
1605 // References:
1606 // [1] https://github.com/cassioneri/calendar
1607 // [2] https://accu.org/journals/overload/28/155/overload155.pdf#page=16
1608
1609 constexpr uint32_t __multiplier = 42949673;
1610 constexpr uint32_t __bound = 42949669;
1611 constexpr uint32_t __max_dividend = 1073741799;
1612 constexpr uint32_t __offset = __max_dividend / 2 / 100 * 100;
1613 const bool __is_multiple_of_100
1614 = __multiplier * (_M_y + __offset) < __bound;
1615 return (!__is_multiple_of_100 || _M_y % 400 == 0) && _M_y % 4 == 0;
1616 }
1617
1618 explicit constexpr
1619 operator int() const noexcept
1620 { return _M_y; }
1621
1622 constexpr bool
1623 ok() const noexcept
1624 { return min()._M_y <= _M_y && _M_y <= max()._M_y; }
1625
1626 friend constexpr bool
1627 operator==(const year& __x, const year& __y) noexcept
1628 { return int{__x} == int{__y}; }
1629
1630 friend constexpr strong_ordering
1631 operator<=>(const year& __x, const year& __y) noexcept
1632 { return int{__x} <=> int{__y}; }
1633
1634 friend constexpr year
1635 operator+(const year& __x, const years& __y) noexcept
1636 { return year{int{__x} + static_cast<int>(__y.count())}; }
1637
1638 friend constexpr year
1639 operator+(const years& __x, const year& __y) noexcept
1640 { return __y + __x; }
1641
1642 friend constexpr year
1643 operator-(const year& __x, const years& __y) noexcept
1644 { return __x + -__y; }
1645
1646 friend constexpr years
1647 operator-(const year& __x, const year& __y) noexcept
1648 { return years{int{__x} - int{__y}}; }
1649
1650 friend constexpr year_month
1651 operator/(const year& __y, int __m) noexcept;
1652
1653 friend constexpr year_month_day
1654 operator/(const year& __y, const month_day& __md) noexcept;
1655
1656 friend constexpr year_month_day
1657 operator/(const month_day& __md, const year& __y) noexcept;
1658
1659 friend constexpr year_month_day_last
1660 operator/(const year& __y, const month_day_last& __mdl) noexcept;
1661
1662 friend constexpr year_month_day_last
1663 operator/(const month_day_last& __mdl, const year& __y) noexcept;
1664
1665 friend constexpr year_month_weekday
1666 operator/(const year& __y, const month_weekday& __mwd) noexcept;
1667
1668 friend constexpr year_month_weekday
1669 operator/(const month_weekday& __mwd, const year& __y) noexcept;
1670
1671 friend constexpr year_month_weekday_last
1672 operator/(const year& __y, const month_weekday_last& __mwdl) noexcept;
1673
1674 friend constexpr year_month_weekday_last
1675 operator/(const month_weekday_last& __mwdl, const year& __y) noexcept;
1676
1677 // TODO: Implement operator<<, to_stream, from_stream.
1678 };
1679
1680 // WEEKDAY
1681
1682 class weekday
1683 {
1684 private:
1685 unsigned char _M_wd;
1686
1687 static constexpr weekday
1688 _S_from_days(const days& __d)
1689 {
1690 auto __n = __d.count();
1691 return weekday(__n >= -4 ? (__n + 4) % 7 : (__n + 5) % 7 + 6);
1692 }
1693
1694 public:
1695 weekday() = default;
1696
1697 explicit constexpr
1698 weekday(unsigned __wd) noexcept
1699 : _M_wd(__wd == 7 ? 0 : __wd) // __wd % 7 ?
1700 { }
1701
1702 constexpr
1703 weekday(const sys_days& __dp) noexcept
1704 : weekday{_S_from_days(__dp.time_since_epoch())}
1705 { }
1706
1707 explicit constexpr
1708 weekday(const local_days& __dp) noexcept
1709 : weekday{sys_days{__dp.time_since_epoch()}}
1710 { }
1711
1712 constexpr weekday&
1713 operator++() noexcept
1714 {
1715 *this += days{1};
1716 return *this;
1717 }
1718
1719 constexpr weekday
1720 operator++(int) noexcept
1721 {
1722 auto __ret = *this;
1723 ++(*this);
1724 return __ret;
1725 }
1726
1727 constexpr weekday&
1728 operator--() noexcept
1729 {
1730 *this -= days{1};
1731 return *this;
1732 }
1733
1734 constexpr weekday
1735 operator--(int) noexcept
1736 {
1737 auto __ret = *this;
1738 --(*this);
1739 return __ret;
1740 }
1741
1742 constexpr weekday&
1743 operator+=(const days& __d) noexcept
1744 {
1745 *this = *this + __d;
1746 return *this;
1747 }
1748
1749 constexpr weekday&
1750 operator-=(const days& __d) noexcept
1751 {
1752 *this = *this - __d;
1753 return *this;
1754 }
1755
1756 constexpr unsigned
1757 c_encoding() const noexcept
1758 { return _M_wd; }
1759
1760 constexpr unsigned
1761 iso_encoding() const noexcept
1762 { return _M_wd == 0u ? 7u : _M_wd; }
1763
1764 constexpr bool
1765 ok() const noexcept
1766 { return _M_wd <= 6; }
1767
1768 constexpr weekday_indexed
1769 operator[](unsigned __index) const noexcept;
1770
1771 constexpr weekday_last
1772 operator[](last_spec) const noexcept;
1773
1774 friend constexpr bool
1775 operator==(const weekday& __x, const weekday& __y) noexcept
1776 { return __x._M_wd == __y._M_wd; }
1777
1778 friend constexpr weekday
1779 operator+(const weekday& __x, const days& __y) noexcept
1780 {
1781 auto __n = static_cast<long long>(__x._M_wd) + __y.count();
1782 return weekday{__detail::__modulo(__n, 7)};
1783 }
1784
1785 friend constexpr weekday
1786 operator+(const days& __x, const weekday& __y) noexcept
1787 { return __y + __x; }
1788
1789 friend constexpr weekday
1790 operator-(const weekday& __x, const days& __y) noexcept
1791 { return __x + -__y; }
1792
1793 friend constexpr days
1794 operator-(const weekday& __x, const weekday& __y) noexcept
1795 {
1796 auto __n = static_cast<long long>(__x._M_wd) - __y._M_wd;
1797 return days{__detail::__modulo(__n, 7)};
1798 }
1799
1800 // TODO: operator<<, from_stream.
1801 };
1802
1803 inline constexpr weekday Sunday{0};
1804 inline constexpr weekday Monday{1};
1805 inline constexpr weekday Tuesday{2};
1806 inline constexpr weekday Wednesday{3};
1807 inline constexpr weekday Thursday{4};
1808 inline constexpr weekday Friday{5};
1809 inline constexpr weekday Saturday{6};
1810
1811 // WEEKDAY_INDEXED
1812
1813 class weekday_indexed
1814 {
1815 private:
1816 chrono::weekday _M_wd;
1817 unsigned char _M_index;
1818
1819 public:
1820 weekday_indexed() = default;
1821
1822 constexpr
1823 weekday_indexed(const chrono::weekday& __wd, unsigned __index) noexcept
1824 : _M_wd(__wd), _M_index(__index)
1825 { }
1826
1827 constexpr chrono::weekday
1828 weekday() const noexcept
1829 { return _M_wd; }
1830
1831 constexpr unsigned
1832 index() const noexcept
1833 { return _M_index; };
1834
1835 constexpr bool
1836 ok() const noexcept
1837 { return _M_wd.ok() && 1 <= _M_index && _M_index <= 5; }
1838
1839 friend constexpr bool
1840 operator==(const weekday_indexed& __x, const weekday_indexed& __y) noexcept
1841 { return __x.weekday() == __y.weekday() && __x.index() == __y.index(); }
1842
1843 friend constexpr month_weekday
1844 operator/(const month& __m, const weekday_indexed& __wdi) noexcept;
1845
1846 friend constexpr month_weekday
1847 operator/(int __m, const weekday_indexed& __wdi) noexcept;
1848
1849 friend constexpr month_weekday
1850 operator/(const weekday_indexed& __wdi, const month& __m) noexcept;
1851
1852 friend constexpr month_weekday
1853 operator/(const weekday_indexed& __wdi, int __m) noexcept;
1854
1855 friend constexpr year_month_weekday
1856 operator/(const year_month& __ym, const weekday_indexed& __wdi) noexcept;
1857
1858 // TODO: Implement operator<<.
1859 };
1860
1861 constexpr weekday_indexed
1862 weekday::operator[](unsigned __index) const noexcept
1863 { return {*this, __index}; }
1864
1865 // WEEKDAY_LAST
1866
1867 class weekday_last
1868 {
1869 private:
1870 chrono::weekday _M_wd;
1871
1872 public:
1873 explicit constexpr
1874 weekday_last(const chrono::weekday& __wd) noexcept
1875 : _M_wd{__wd}
1876 { }
1877
1878 constexpr chrono::weekday
1879 weekday() const noexcept
1880 { return _M_wd; }
1881
1882 constexpr bool
1883 ok() const noexcept
1884 { return _M_wd.ok(); }
1885
1886 friend constexpr bool
1887 operator==(const weekday_last& __x, const weekday_last& __y) noexcept
1888 { return __x.weekday() == __y.weekday(); }
1889
1890 friend constexpr month_weekday_last
1891 operator/(int __m, const weekday_last& __wdl) noexcept;
1892
1893 friend constexpr month_weekday_last
1894 operator/(const weekday_last& __wdl, int __m) noexcept;
1895
1896 friend constexpr year_month_weekday_last
1897 operator/(const year_month& __ym, const weekday_last& __wdl) noexcept;
1898
1899 // TODO: Implement operator<<.
1900 };
1901
1902 constexpr weekday_last
1903 weekday::operator[](last_spec) const noexcept
1904 { return weekday_last{*this}; }
1905
1906 // MONTH_DAY
1907
1908 class month_day
1909 {
1910 private:
1911 chrono::month _M_m;
1912 chrono::day _M_d;
1913
1914 public:
1915 month_day() = default;
1916
1917 constexpr
1918 month_day(const chrono::month& __m, const chrono::day& __d) noexcept
1919 : _M_m{__m}, _M_d{__d}
1920 { }
1921
1922 constexpr chrono::month
1923 month() const noexcept
1924 { return _M_m; }
1925
1926 constexpr chrono::day
1927 day() const noexcept
1928 { return _M_d; }
1929
1930 constexpr bool
1931 ok() const noexcept
1932 {
1933 return _M_m.ok()
1934 && 1u <= unsigned(_M_d)
1935 && unsigned(_M_d) <= __detail::__days_per_month[unsigned(_M_m) - 1];
1936 }
1937
1938 friend constexpr bool
1939 operator==(const month_day& __x, const month_day& __y) noexcept
1940 { return __x.month() == __y.month() && __x.day() == __y.day(); }
1941
1942 friend constexpr strong_ordering
1943 operator<=>(const month_day& __x, const month_day& __y) noexcept
1944 = default;
1945
1946 friend constexpr month_day
1947 operator/(const chrono::month& __m, const chrono::day& __d) noexcept
1948 { return {__m, __d}; }
1949
1950 friend constexpr month_day
1951 operator/(const chrono::month& __m, int __d) noexcept
1952 { return {__m, chrono::day(unsigned(__d))}; }
1953
1954 friend constexpr month_day
1955 operator/(int __m, const chrono::day& __d) noexcept
1956 { return {chrono::month(unsigned(__m)), __d}; }
1957
1958 friend constexpr month_day
1959 operator/(const chrono::day& __d, const chrono::month& __m) noexcept
1960 { return {__m, __d}; }
1961
1962 friend constexpr month_day
1963 operator/(const chrono::day& __d, int __m) noexcept
1964 { return {chrono::month(unsigned(__m)), __d}; }
1965
1966 friend constexpr year_month_day
1967 operator/(int __y, const month_day& __md) noexcept;
1968
1969 friend constexpr year_month_day
1970 operator/(const month_day& __md, int __y) noexcept;
1971
1972 // TODO: Implement operator<<, from_stream.
1973 };
1974
1975 // MONTH_DAY_LAST
1976
1977 class month_day_last
1978 {
1979 private:
1980 chrono::month _M_m;
1981
1982 public:
1983 explicit constexpr
1984 month_day_last(const chrono::month& __m) noexcept
1985 : _M_m{__m}
1986 { }
1987
1988 constexpr chrono::month
1989 month() const noexcept
1990 { return _M_m; }
1991
1992 constexpr bool
1993 ok() const noexcept
1994 { return _M_m.ok(); }
1995
1996 friend constexpr bool
1997 operator==(const month_day_last& __x, const month_day_last& __y) noexcept
1998 { return __x.month() == __y.month(); }
1999
2000 friend constexpr strong_ordering
2001 operator<=>(const month_day_last& __x, const month_day_last& __y) noexcept
2002 = default;
2003
2004 friend constexpr month_day_last
2005 operator/(const chrono::month& __m, last_spec) noexcept
2006 { return month_day_last{__m}; }
2007
2008 friend constexpr month_day_last
2009 operator/(int __m, last_spec) noexcept
2010 { return chrono::month(unsigned(__m)) / last; }
2011
2012 friend constexpr month_day_last
2013 operator/(last_spec, const chrono::month& __m) noexcept
2014 { return __m / last; }
2015
2016 friend constexpr month_day_last
2017 operator/(last_spec, int __m) noexcept
2018 { return __m / last; }
2019
2020 friend constexpr year_month_day_last
2021 operator/(int __y, const month_day_last& __mdl) noexcept;
2022
2023 friend constexpr year_month_day_last
2024 operator/(const month_day_last& __mdl, int __y) noexcept;
2025
2026 // TODO: Implement operator<<.
2027 };
2028
2029 // MONTH_WEEKDAY
2030
2031 class month_weekday
2032 {
2033 private:
2034 chrono::month _M_m;
2035 chrono::weekday_indexed _M_wdi;
2036
2037 public:
2038 constexpr
2039 month_weekday(const chrono::month& __m,
2040 const chrono::weekday_indexed& __wdi) noexcept
2041 : _M_m{__m}, _M_wdi{__wdi}
2042 { }
2043
2044 constexpr chrono::month
2045 month() const noexcept
2046 { return _M_m; }
2047
2048 constexpr chrono::weekday_indexed
2049 weekday_indexed() const noexcept
2050 { return _M_wdi; }
2051
2052 constexpr bool
2053 ok() const noexcept
2054 { return _M_m.ok() && _M_wdi.ok(); }
2055
2056 friend constexpr bool
2057 operator==(const month_weekday& __x, const month_weekday& __y) noexcept
2058 {
2059 return __x.month() == __y.month()
2060 && __x.weekday_indexed() == __y.weekday_indexed();
2061 }
2062
2063 friend constexpr month_weekday
2064 operator/(const chrono::month& __m,
2065 const chrono::weekday_indexed& __wdi) noexcept
2066 { return {__m, __wdi}; }
2067
2068 friend constexpr month_weekday
2069 operator/(int __m, const chrono::weekday_indexed& __wdi) noexcept
2070 { return chrono::month(unsigned(__m)) / __wdi; }
2071
2072 friend constexpr month_weekday
2073 operator/(const chrono::weekday_indexed& __wdi,
2074 const chrono::month& __m) noexcept
2075 { return __m / __wdi; }
2076
2077 friend constexpr month_weekday
2078 operator/(const chrono::weekday_indexed& __wdi, int __m) noexcept
2079 { return __m / __wdi; }
2080
2081 friend constexpr year_month_weekday
2082 operator/(int __y, const month_weekday& __mwd) noexcept;
2083
2084 friend constexpr year_month_weekday
2085 operator/(const month_weekday& __mwd, int __y) noexcept;
2086
2087 // TODO: Implement operator<<.
2088 };
2089
2090 // MONTH_WEEKDAY_LAST
2091
2092 class month_weekday_last
2093 {
2094 private:
2095 chrono::month _M_m;
2096 chrono::weekday_last _M_wdl;
2097
2098 public:
2099 constexpr
2100 month_weekday_last(const chrono::month& __m,
2101 const chrono::weekday_last& __wdl) noexcept
2102 :_M_m{__m}, _M_wdl{__wdl}
2103 { }
2104
2105 constexpr chrono::month
2106 month() const noexcept
2107 { return _M_m; }
2108
2109 constexpr chrono::weekday_last
2110 weekday_last() const noexcept
2111 { return _M_wdl; }
2112
2113 constexpr bool
2114 ok() const noexcept
2115 { return _M_m.ok() && _M_wdl.ok(); }
2116
2117 friend constexpr bool
2118 operator==(const month_weekday_last& __x,
2119 const month_weekday_last& __y) noexcept
2120 {
2121 return __x.month() == __y.month()
2122 && __x.weekday_last() == __y.weekday_last();
2123 }
2124
2125 friend constexpr month_weekday_last
2126 operator/(const chrono::month& __m,
2127 const chrono::weekday_last& __wdl) noexcept
2128 { return {__m, __wdl}; }
2129
2130 friend constexpr month_weekday_last
2131 operator/(int __m, const chrono::weekday_last& __wdl) noexcept
2132 { return chrono::month(unsigned(__m)) / __wdl; }
2133
2134 friend constexpr month_weekday_last
2135 operator/(const chrono::weekday_last& __wdl,
2136 const chrono::month& __m) noexcept
2137 { return __m / __wdl; }
2138
2139 friend constexpr month_weekday_last
2140 operator/(const chrono::weekday_last& __wdl, int __m) noexcept
2141 { return chrono::month(unsigned(__m)) / __wdl; }
2142
2143 friend constexpr year_month_weekday_last
2144 operator/(int __y, const month_weekday_last& __mwdl) noexcept;
2145
2146 friend constexpr year_month_weekday_last
2147 operator/(const month_weekday_last& __mwdl, int __y) noexcept;
2148
2149 // TODO: Implement operator<<.
2150 };
2151
2152 // YEAR_MONTH
2153
2154 namespace __detail
2155 {
2156 // [time.cal.ym], [time.cal.ymd], etc constrain the 'months'-based
2157 // addition/subtraction operator overloads like so:
2158 //
2159 // Constraints: if the argument supplied by the caller for the months
2160 // parameter is convertible to years, its implicit conversion sequence
2161 // to years is worse than its implicit conversion sequence to months.
2162 //
2163 // We realize this constraint by templatizing the 'months'-based
2164 // overloads (using a dummy defaulted template parameter), so that
2165 // overload resolution doesn't select the 'months'-based overload unless
2166 // the implicit conversion sequence to 'months' is better than that to
2167 // 'years'.
2168 using __months_years_conversion_disambiguator = void;
2169 }
2170
2171 class year_month
2172 {
2173 private:
2174 chrono::year _M_y;
2175 chrono::month _M_m;
2176
2177 public:
2178 year_month() = default;
2179
2180 constexpr
2181 year_month(const chrono::year& __y, const chrono::month& __m) noexcept
2182 : _M_y{__y}, _M_m{__m}
2183 { }
2184
2185 constexpr chrono::year
2186 year() const noexcept
2187 { return _M_y; }
2188
2189 constexpr chrono::month
2190 month() const noexcept
2191 { return _M_m; }
2192
2193 template<typename = __detail::__months_years_conversion_disambiguator>
2194 constexpr year_month&
2195 operator+=(const months& __dm) noexcept
2196 {
2197 *this = *this + __dm;
2198 return *this;
2199 }
2200
2201 template<typename = __detail::__months_years_conversion_disambiguator>
2202 constexpr year_month&
2203 operator-=(const months& __dm) noexcept
2204 {
2205 *this = *this - __dm;
2206 return *this;
2207 }
2208
2209 constexpr year_month&
2210 operator+=(const years& __dy) noexcept
2211 {
2212 *this = *this + __dy;
2213 return *this;
2214 }
2215
2216 constexpr year_month&
2217 operator-=(const years& __dy) noexcept
2218 {
2219 *this = *this - __dy;
2220 return *this;
2221 }
2222
2223 constexpr bool
2224 ok() const noexcept
2225 { return _M_y.ok() && _M_m.ok(); }
2226
2227 friend constexpr bool
2228 operator==(const year_month& __x, const year_month& __y) noexcept
2229 { return __x.year() == __y.year() && __x.month() == __y.month(); }
2230
2231 friend constexpr strong_ordering
2232 operator<=>(const year_month& __x, const year_month& __y) noexcept
2233 = default;
2234
2235 template<typename = __detail::__months_years_conversion_disambiguator>
2236 friend constexpr year_month
2237 operator+(const year_month& __ym, const months& __dm) noexcept
2238 {
2239 // TODO: Optimize?
2240 auto __m = __ym.month() + __dm;
2241 auto __i = int(unsigned(__ym.month())) - 1 + __dm.count();
2242 auto __y = (__i < 0
2243 ? __ym.year() + years{(__i - 11) / 12}
2244 : __ym.year() + years{__i / 12});
2245 return __y / __m;
2246 }
2247
2248 template<typename = __detail::__months_years_conversion_disambiguator>
2249 friend constexpr year_month
2250 operator+(const months& __dm, const year_month& __ym) noexcept
2251 { return __ym + __dm; }
2252
2253 template<typename = __detail::__months_years_conversion_disambiguator>
2254 friend constexpr year_month
2255 operator-(const year_month& __ym, const months& __dm) noexcept
2256 { return __ym + -__dm; }
2257
2258 friend constexpr months
2259 operator-(const year_month& __x, const year_month& __y) noexcept
2260 {
2261 return (__x.year() - __y.year()
2262 + months{static_cast<int>(unsigned{__x.month()})
2263 - static_cast<int>(unsigned{__y.month()})});
2264 }
2265
2266 friend constexpr year_month
2267 operator+(const year_month& __ym, const years& __dy) noexcept
2268 { return (__ym.year() + __dy) / __ym.month(); }
2269
2270 friend constexpr year_month
2271 operator+(const years& __dy, const year_month& __ym) noexcept
2272 { return __ym + __dy; }
2273
2274 friend constexpr year_month
2275 operator-(const year_month& __ym, const years& __dy) noexcept
2276 { return __ym + -__dy; }
2277
2278 friend constexpr year_month
2279 operator/(const chrono::year& __y, const chrono::month& __m) noexcept
2280 { return {__y, __m}; }
2281
2282 friend constexpr year_month
2283 operator/(const chrono::year& __y, int __m) noexcept
2284 { return {__y, chrono::month(unsigned(__m))}; }
2285
2286 friend constexpr year_month_day
2287 operator/(const year_month& __ym, int __d) noexcept;
2288
2289 friend constexpr year_month_day_last
2290 operator/(const year_month& __ym, last_spec) noexcept;
2291
2292 // TODO: Implement operator<<, from_stream.
2293 };
2294
2295 // YEAR_MONTH_DAY
2296
2297 class year_month_day
2298 {
2299 private:
2300 chrono::year _M_y;
2301 chrono::month _M_m;
2302 chrono::day _M_d;
2303
2304 static constexpr year_month_day _S_from_days(const days& __dp) noexcept;
2305
2306 constexpr days _M_days_since_epoch() const noexcept;
2307
2308 public:
2309 year_month_day() = default;
2310
2311 constexpr
2312 year_month_day(const chrono::year& __y, const chrono::month& __m,
2313 const chrono::day& __d) noexcept
2314 : _M_y{__y}, _M_m{__m}, _M_d{__d}
2315 { }
2316
2317 constexpr
2318 year_month_day(const year_month_day_last& __ymdl) noexcept;
2319
2320 constexpr
2321 year_month_day(const sys_days& __dp) noexcept
2322 : year_month_day(_S_from_days(__dp.time_since_epoch()))
2323 { }
2324
2325 explicit constexpr
2326 year_month_day(const local_days& __dp) noexcept
2327 : year_month_day(sys_days{__dp.time_since_epoch()})
2328 { }
2329
2330 template<typename = __detail::__months_years_conversion_disambiguator>
2331 constexpr year_month_day&
2332 operator+=(const months& __m) noexcept
2333 {
2334 *this = *this + __m;
2335 return *this;
2336 }
2337
2338 template<typename = __detail::__months_years_conversion_disambiguator>
2339 constexpr year_month_day&
2340 operator-=(const months& __m) noexcept
2341 {
2342 *this = *this - __m;
2343 return *this;
2344 }
2345
2346 constexpr year_month_day&
2347 operator+=(const years& __y) noexcept
2348 {
2349 *this = *this + __y;
2350 return *this;
2351 }
2352
2353 constexpr year_month_day&
2354 operator-=(const years& __y) noexcept
2355 {
2356 *this = *this - __y;
2357 return *this;
2358 }
2359
2360 constexpr chrono::year
2361 year() const noexcept
2362 { return _M_y; }
2363
2364 constexpr chrono::month
2365 month() const noexcept
2366 { return _M_m; }
2367
2368 constexpr chrono::day
2369 day() const noexcept
2370 { return _M_d; }
2371
2372 constexpr
2373 operator sys_days() const noexcept
2374 { return sys_days{_M_days_since_epoch()}; }
2375
2376 explicit constexpr
2377 operator local_days() const noexcept
2378 { return local_days{sys_days{*this}.time_since_epoch()}; }
2379
2380 constexpr bool ok() const noexcept;
2381
2382 friend constexpr bool
2383 operator==(const year_month_day& __x, const year_month_day& __y) noexcept
2384 {
2385 return __x.year() == __y.year()
2386 && __x.month() == __y.month()
2387 && __x.day() == __y.day();
2388 }
2389
2390 friend constexpr strong_ordering
2391 operator<=>(const year_month_day& __x, const year_month_day& __y) noexcept
2392 = default;
2393
2394 template<typename = __detail::__months_years_conversion_disambiguator>
2395 friend constexpr year_month_day
2396 operator+(const year_month_day& __ymd, const months& __dm) noexcept
2397 { return (__ymd.year() / __ymd.month() + __dm) / __ymd.day(); }
2398
2399 template<typename = __detail::__months_years_conversion_disambiguator>
2400 friend constexpr year_month_day
2401 operator+(const months& __dm, const year_month_day& __ymd) noexcept
2402 { return __ymd + __dm; }
2403
2404 friend constexpr year_month_day
2405 operator+(const year_month_day& __ymd, const years& __dy) noexcept
2406 { return (__ymd.year() + __dy) / __ymd.month() / __ymd.day(); }
2407
2408 friend constexpr year_month_day
2409 operator+(const years& __dy, const year_month_day& __ymd) noexcept
2410 { return __ymd + __dy; }
2411
2412 template<typename = __detail::__months_years_conversion_disambiguator>
2413 friend constexpr year_month_day
2414 operator-(const year_month_day& __ymd, const months& __dm) noexcept
2415 { return __ymd + -__dm; }
2416
2417 friend constexpr year_month_day
2418 operator-(const year_month_day& __ymd, const years& __dy) noexcept
2419 { return __ymd + -__dy; }
2420
2421 friend constexpr year_month_day
2422 operator/(const year_month& __ym, const chrono::day& __d) noexcept
2423 { return {__ym.year(), __ym.month(), __d}; }
2424
2425 friend constexpr year_month_day
2426 operator/(const year_month& __ym, int __d) noexcept
2427 { return __ym / chrono::day{unsigned(__d)}; }
2428
2429 friend constexpr year_month_day
2430 operator/(const chrono::year& __y, const month_day& __md) noexcept
2431 { return __y / __md.month() / __md.day(); }
2432
2433 friend constexpr year_month_day
2434 operator/(int __y, const month_day& __md) noexcept
2435 { return chrono::year{__y} / __md; }
2436
2437 friend constexpr year_month_day
2438 operator/(const month_day& __md, const chrono::year& __y) noexcept
2439 { return __y / __md; }
2440
2441 friend constexpr year_month_day
2442 operator/(const month_day& __md, int __y) noexcept
2443 { return chrono::year(__y) / __md; }
2444
2445 // TODO: Implement operator<<, from_stream.
2446 };
2447
2448 // Construct from days since 1970/01/01.
2449 // Proposition 6.3 of Neri and Schneider,
2450 // "Euclidean Affine Functions and Applications to Calendar Algorithms".
2451 // https://arxiv.org/abs/2102.06959
2452 constexpr year_month_day
2453 year_month_day::_S_from_days(const days& __dp) noexcept
2454 {
2455 constexpr auto __z2 = static_cast<uint32_t>(-1468000);
2456 constexpr auto __r2_e3 = static_cast<uint32_t>(536895458);
2457
2458 const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3;
2459
2460 const auto __n1 = 4 * __r0 + 3;
2461 const auto __q1 = __n1 / 146097;
2462 const auto __r1 = __n1 % 146097 / 4;
2463
2464 constexpr auto __p32 = static_cast<uint64_t>(1) << 32;
2465 const auto __n2 = 4 * __r1 + 3;
2466 const auto __u2 = static_cast<uint64_t>(2939745) * __n2;
2467 const auto __q2 = static_cast<uint32_t>(__u2 / __p32);
2468 const auto __r2 = static_cast<uint32_t>(__u2 % __p32) / 2939745 / 4;
2469
2470 constexpr auto __p16 = static_cast<uint32_t>(1) << 16;
2471 const auto __n3 = 2141 * __r2 + 197913;
2472 const auto __q3 = __n3 / __p16;
2473 const auto __r3 = __n3 % __p16 / 2141;
2474
2475 const auto __y0 = 100 * __q1 + __q2;
2476 const auto __m0 = __q3;
2477 const auto __d0 = __r3;
2478
2479 const auto __j = __r2 >= 306;
2480 const auto __y1 = __y0 + __j;
2481 const auto __m1 = __j ? __m0 - 12 : __m0;
2482 const auto __d1 = __d0 + 1;
2483
2484 return year_month_day{chrono::year{static_cast<int>(__y1 + __z2)},
2485 chrono::month{__m1}, chrono::day{__d1}};
2486 }
2487
2488 // Days since 1970/01/01.
2489 // Proposition 6.2 of Neri and Schneider,
2490 // "Euclidean Affine Functions and Applications to Calendar Algorithms".
2491 // https://arxiv.org/abs/2102.06959
2492 constexpr days
2493 year_month_day::_M_days_since_epoch() const noexcept
2494 {
2495 auto constexpr __z2 = static_cast<uint32_t>(-1468000);
2496 auto constexpr __r2_e3 = static_cast<uint32_t>(536895458);
2497
2498 const auto __y1 = static_cast<uint32_t>(static_cast<int>(_M_y)) - __z2;
2499 const auto __m1 = static_cast<uint32_t>(static_cast<unsigned>(_M_m));
2500 const auto __d1 = static_cast<uint32_t>(static_cast<unsigned>(_M_d));
2501
2502 const auto __j = static_cast<uint32_t>(__m1 < 3);
2503 const auto __y0 = __y1 - __j;
2504 const auto __m0 = __j ? __m1 + 12 : __m1;
2505 const auto __d0 = __d1 - 1;
2506
2507 const auto __q1 = __y0 / 100;
2508 const auto __yc = 1461 * __y0 / 4 - __q1 + __q1 / 4;
2509 const auto __mc = (979 *__m0 - 2919) / 32;
2510 const auto __dc = __d0;
2511
2512 return days{static_cast<int32_t>(__yc + __mc + __dc - __r2_e3)};
2513 }
2514
2515 // YEAR_MONTH_DAY_LAST
2516
2517 class year_month_day_last
2518 {
2519 private:
2520 chrono::year _M_y;
2521 chrono::month_day_last _M_mdl;
2522
2523 public:
2524 constexpr
2525 year_month_day_last(const chrono::year& __y,
2526 const chrono::month_day_last& __mdl) noexcept
2527 : _M_y{__y}, _M_mdl{__mdl}
2528 { }
2529
2530 template<typename = __detail::__months_years_conversion_disambiguator>
2531 constexpr year_month_day_last&
2532 operator+=(const months& __m) noexcept
2533 {
2534 *this = *this + __m;
2535 return *this;
2536 }
2537
2538 template<typename = __detail::__months_years_conversion_disambiguator>
2539 constexpr year_month_day_last&
2540 operator-=(const months& __m) noexcept
2541 {
2542 *this = *this - __m;
2543 return *this;
2544 }
2545
2546 constexpr year_month_day_last&
2547 operator+=(const years& __y) noexcept
2548 {
2549 *this = *this + __y;
2550 return *this;
2551 }
2552
2553 constexpr year_month_day_last&
2554 operator-=(const years& __y) noexcept
2555 {
2556 *this = *this - __y;
2557 return *this;
2558 }
2559
2560 constexpr chrono::year
2561 year() const noexcept
2562 { return _M_y; }
2563
2564 constexpr chrono::month
2565 month() const noexcept
2566 { return _M_mdl.month(); }
2567
2568 constexpr chrono::month_day_last
2569 month_day_last() const noexcept
2570 { return _M_mdl; }
2571
2572 // Return A day representing the last day of this year, month pair.
2573 constexpr chrono::day
2574 day() const noexcept
2575 {
2576 const auto __m = static_cast<unsigned>(month());
2577
2578 // Excluding February, the last day of month __m is either 30 or 31 or,
2579 // in another words, it is 30 + b = 30 | b, where b is in {0, 1}.
2580
2581 // If __m in {1, 3, 4, 5, 6, 7}, then b is 1 if, and only if __m is odd.
2582 // Hence, b = __m & 1 = (__m ^ 0) & 1.
2583
2584 // If __m in {8, 9, 10, 11, 12}, then b is 1 if, and only if __m is even.
2585 // Hence, b = (__m ^ 1) & 1.
2586
2587 // Therefore, b = (__m ^ c) & 1, where c = 0, if __m < 8, or c = 1 if
2588 // __m >= 8, that is, c = __m >> 3.
2589
2590 // The above mathematically justifies this implementation whose
2591 // performance does not depend on look-up tables being on the L1 cache.
2592 return chrono::day{__m != 2 ? ((__m ^ (__m >> 3)) & 1) | 30
2593 : _M_y.is_leap() ? 29 : 28};
2594 }
2595
2596 constexpr
2597 operator sys_days() const noexcept
2598 { return sys_days{year() / month() / day()}; }
2599
2600 explicit constexpr
2601 operator local_days() const noexcept
2602 { return local_days{sys_days{*this}.time_since_epoch()}; }
2603
2604 constexpr bool
2605 ok() const noexcept
2606 { return _M_y.ok() && _M_mdl.ok(); }
2607
2608 friend constexpr bool
2609 operator==(const year_month_day_last& __x,
2610 const year_month_day_last& __y) noexcept
2611 {
2612 return __x.year() == __y.year()
2613 && __x.month_day_last() == __y.month_day_last();
2614 }
2615
2616 friend constexpr strong_ordering
2617 operator<=>(const year_month_day_last& __x,
2618 const year_month_day_last& __y) noexcept
2619 = default;
2620
2621 template<typename = __detail::__months_years_conversion_disambiguator>
2622 friend constexpr year_month_day_last
2623 operator+(const year_month_day_last& __ymdl,
2624 const months& __dm) noexcept
2625 { return (__ymdl.year() / __ymdl.month() + __dm) / last; }
2626
2627 template<typename = __detail::__months_years_conversion_disambiguator>
2628 friend constexpr year_month_day_last
2629 operator+(const months& __dm,
2630 const year_month_day_last& __ymdl) noexcept
2631 { return __ymdl + __dm; }
2632
2633 template<typename = __detail::__months_years_conversion_disambiguator>
2634 friend constexpr year_month_day_last
2635 operator-(const year_month_day_last& __ymdl,
2636 const months& __dm) noexcept
2637 { return __ymdl + -__dm; }
2638
2639 friend constexpr year_month_day_last
2640 operator+(const year_month_day_last& __ymdl,
2641 const years& __dy) noexcept
2642 { return {__ymdl.year() + __dy, __ymdl.month_day_last()}; }
2643
2644 friend constexpr year_month_day_last
2645 operator+(const years& __dy,
2646 const year_month_day_last& __ymdl) noexcept
2647 { return __ymdl + __dy; }
2648
2649 friend constexpr year_month_day_last
2650 operator-(const year_month_day_last& __ymdl,
2651 const years& __dy) noexcept
2652 { return __ymdl + -__dy; }
2653
2654 friend constexpr year_month_day_last
2655 operator/(const year_month& __ym, last_spec) noexcept
2656 { return {__ym.year(), chrono::month_day_last{__ym.month()}}; }
2657
2658 friend constexpr year_month_day_last
2659 operator/(const chrono::year& __y,
2660 const chrono::month_day_last& __mdl) noexcept
2661 { return {__y, __mdl}; }
2662
2663 friend constexpr year_month_day_last
2664 operator/(int __y, const chrono::month_day_last& __mdl) noexcept
2665 { return chrono::year(__y) / __mdl; }
2666
2667 friend constexpr year_month_day_last
2668 operator/(const chrono::month_day_last& __mdl,
2669 const chrono::year& __y) noexcept
2670 { return __y / __mdl; }
2671
2672 friend constexpr year_month_day_last
2673 operator/(const chrono::month_day_last& __mdl, int __y) noexcept
2674 { return chrono::year(__y) / __mdl; }
2675
2676 // TODO: Implement operator<<.
2677 };
2678
2679 // year_month_day ctor from year_month_day_last
2680 constexpr
2681 year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept
2682 : _M_y{__ymdl.year()}, _M_m{__ymdl.month()}, _M_d{__ymdl.day()}
2683 { }
2684
2685 constexpr bool
2686 year_month_day::ok() const noexcept
2687 {
2688 if (!_M_y.ok() || !_M_m.ok())
2689 return false;
2690 return chrono::day{1} <= _M_d && _M_d <= (_M_y / _M_m / last).day();
2691 }
2692
2693 // YEAR_MONTH_WEEKDAY
2694
2695 class year_month_weekday
2696 {
2697 private:
2698 chrono::year _M_y;
2699 chrono::month _M_m;
2700 chrono::weekday_indexed _M_wdi;
2701
2702 static constexpr year_month_weekday
2703 _S_from_sys_days(const sys_days& __dp)
2704 {
2705 year_month_day __ymd{__dp};
2706 chrono::weekday __wd{__dp};
2707 auto __index = __wd[(unsigned{__ymd.day()} - 1) / 7 + 1];
2708 return {__ymd.year(), __ymd.month(), __index};
2709 }
2710
2711 public:
2712 year_month_weekday() = default;
2713
2714 constexpr
2715 year_month_weekday(const chrono::year& __y, const chrono::month& __m,
2716 const chrono::weekday_indexed& __wdi) noexcept
2717 : _M_y{__y}, _M_m{__m}, _M_wdi{__wdi}
2718 { }
2719
2720 constexpr
2721 year_month_weekday(const sys_days& __dp) noexcept
2722 : year_month_weekday{_S_from_sys_days(__dp)}
2723 { }
2724
2725 explicit constexpr
2726 year_month_weekday(const local_days& __dp) noexcept
2727 : year_month_weekday{sys_days{__dp.time_since_epoch()}}
2728 { }
2729
2730 template<typename = __detail::__months_years_conversion_disambiguator>
2731 constexpr year_month_weekday&
2732 operator+=(const months& __m) noexcept
2733 {
2734 *this = *this + __m;
2735 return *this;
2736 }
2737
2738 template<typename = __detail::__months_years_conversion_disambiguator>
2739 constexpr year_month_weekday&
2740 operator-=(const months& __m) noexcept
2741 {
2742 *this = *this - __m;
2743 return *this;
2744 }
2745
2746 constexpr year_month_weekday&
2747 operator+=(const years& __y) noexcept
2748 {
2749 *this = *this + __y;
2750 return *this;
2751 }
2752
2753 constexpr year_month_weekday&
2754 operator-=(const years& __y) noexcept
2755 {
2756 *this = *this - __y;
2757 return *this;
2758 }
2759
2760 constexpr chrono::year
2761 year() const noexcept
2762 { return _M_y; }
2763
2764 constexpr chrono::month
2765 month() const noexcept
2766 { return _M_m; }
2767
2768 constexpr chrono::weekday
2769 weekday() const noexcept
2770 { return _M_wdi.weekday(); }
2771
2772 constexpr unsigned
2773 index() const noexcept
2774 { return _M_wdi.index(); }
2775
2776 constexpr chrono::weekday_indexed
2777 weekday_indexed() const noexcept
2778 { return _M_wdi; }
2779
2780 constexpr
2781 operator sys_days() const noexcept
2782 {
2783 auto __d = sys_days{year() / month() / 1};
2784 return __d + (weekday() - chrono::weekday(__d)
2785 + days{(static_cast<int>(index())-1)*7});
2786 }
2787
2788 explicit constexpr
2789 operator local_days() const noexcept
2790 { return local_days{sys_days{*this}.time_since_epoch()}; }
2791
2792 constexpr bool
2793 ok() const noexcept
2794 {
2795 if (!_M_y.ok() || !_M_m.ok() || !_M_wdi.ok())
2796 return false;
2797 if (_M_wdi.index() <= 4)
2798 return true;
2799 days __d = (_M_wdi.weekday()
2800 - chrono::weekday{sys_days{_M_y / _M_m / 1}}
2801 + days((_M_wdi.index()-1)*7 + 1));
2802 __glibcxx_assert(__d.count() >= 1);
2803 return __d.count() <= unsigned{(_M_y / _M_m / last).day()};
2804 }
2805
2806 friend constexpr bool
2807 operator==(const year_month_weekday& __x,
2808 const year_month_weekday& __y) noexcept
2809 {
2810 return __x.year() == __y.year()
2811 && __x.month() == __y.month()
2812 && __x.weekday_indexed() == __y.weekday_indexed();
2813 }
2814
2815 template<typename = __detail::__months_years_conversion_disambiguator>
2816 friend constexpr year_month_weekday
2817 operator+(const year_month_weekday& __ymwd, const months& __dm) noexcept
2818 {
2819 return ((__ymwd.year() / __ymwd.month() + __dm)
2820 / __ymwd.weekday_indexed());
2821 }
2822
2823 template<typename = __detail::__months_years_conversion_disambiguator>
2824 friend constexpr year_month_weekday
2825 operator+(const months& __dm, const year_month_weekday& __ymwd) noexcept
2826 { return __ymwd + __dm; }
2827
2828 friend constexpr year_month_weekday
2829 operator+(const year_month_weekday& __ymwd, const years& __dy) noexcept
2830 { return {__ymwd.year() + __dy, __ymwd.month(), __ymwd.weekday_indexed()}; }
2831
2832 friend constexpr year_month_weekday
2833 operator+(const years& __dy, const year_month_weekday& __ymwd) noexcept
2834 { return __ymwd + __dy; }
2835
2836 template<typename = __detail::__months_years_conversion_disambiguator>
2837 friend constexpr year_month_weekday
2838 operator-(const year_month_weekday& __ymwd, const months& __dm) noexcept
2839 { return __ymwd + -__dm; }
2840
2841 friend constexpr year_month_weekday
2842 operator-(const year_month_weekday& __ymwd, const years& __dy) noexcept
2843 { return __ymwd + -__dy; }
2844
2845 friend constexpr year_month_weekday
2846 operator/(const year_month& __ym,
2847 const chrono::weekday_indexed& __wdi) noexcept
2848 { return {__ym.year(), __ym.month(), __wdi}; }
2849
2850 friend constexpr year_month_weekday
2851 operator/(const chrono::year& __y, const month_weekday& __mwd) noexcept
2852 { return {__y, __mwd.month(), __mwd.weekday_indexed()}; }
2853
2854 friend constexpr year_month_weekday
2855 operator/(int __y, const month_weekday& __mwd) noexcept
2856 { return chrono::year(__y) / __mwd; }
2857
2858 friend constexpr year_month_weekday
2859 operator/(const month_weekday& __mwd, const chrono::year& __y) noexcept
2860 { return __y / __mwd; }
2861
2862 friend constexpr year_month_weekday
2863 operator/(const month_weekday& __mwd, int __y) noexcept
2864 { return chrono::year(__y) / __mwd; }
2865
2866 // TODO: Implement operator<<.
2867 };
2868
2869 // YEAR_MONTH_WEEKDAY_LAST
2870
2871 class year_month_weekday_last
2872 {
2873 private:
2874 chrono::year _M_y;
2875 chrono::month _M_m;
2876 chrono::weekday_last _M_wdl;
2877
2878 public:
2879 constexpr
2880 year_month_weekday_last(const chrono::year& __y, const chrono::month& __m,
2881 const chrono::weekday_last& __wdl) noexcept
2882 : _M_y{__y}, _M_m{__m}, _M_wdl{__wdl}
2883 { }
2884
2885 template<typename = __detail::__months_years_conversion_disambiguator>
2886 constexpr year_month_weekday_last&
2887 operator+=(const months& __m) noexcept
2888 {
2889 *this = *this + __m;
2890 return *this;
2891 }
2892
2893 template<typename = __detail::__months_years_conversion_disambiguator>
2894 constexpr year_month_weekday_last&
2895 operator-=(const months& __m) noexcept
2896 {
2897 *this = *this - __m;
2898 return *this;
2899 }
2900
2901 constexpr year_month_weekday_last&
2902 operator+=(const years& __y) noexcept
2903 {
2904 *this = *this + __y;
2905 return *this;
2906 }
2907
2908 constexpr year_month_weekday_last&
2909 operator-=(const years& __y) noexcept
2910 {
2911 *this = *this - __y;
2912 return *this;
2913 }
2914
2915 constexpr chrono::year
2916 year() const noexcept
2917 { return _M_y; }
2918
2919 constexpr chrono::month
2920 month() const noexcept
2921 { return _M_m; }
2922
2923 constexpr chrono::weekday
2924 weekday() const noexcept
2925 { return _M_wdl.weekday(); }
2926
2927 constexpr chrono::weekday_last
2928 weekday_last() const noexcept
2929 { return _M_wdl; }
2930
2931 constexpr
2932 operator sys_days() const noexcept
2933 {
2934 const auto __d = sys_days{_M_y / _M_m / last};
2935 return sys_days{(__d - (chrono::weekday{__d}
2936 - _M_wdl.weekday())).time_since_epoch()};
2937 }
2938
2939 explicit constexpr
2940 operator local_days() const noexcept
2941 { return local_days{sys_days{*this}.time_since_epoch()}; }
2942
2943 constexpr bool
2944 ok() const noexcept
2945 { return _M_y.ok() && _M_m.ok() && _M_wdl.ok(); }
2946
2947 friend constexpr bool
2948 operator==(const year_month_weekday_last& __x,
2949 const year_month_weekday_last& __y) noexcept
2950 {
2951 return __x.year() == __y.year()
2952 && __x.month() == __y.month()
2953 && __x.weekday_last() == __y.weekday_last();
2954 }
2955
2956 template<typename = __detail::__months_years_conversion_disambiguator>
2957 friend constexpr year_month_weekday_last
2958 operator+(const year_month_weekday_last& __ymwdl,
2959 const months& __dm) noexcept
2960 {
2961 return ((__ymwdl.year() / __ymwdl.month() + __dm)
2962 / __ymwdl.weekday_last());
2963 }
2964
2965 template<typename = __detail::__months_years_conversion_disambiguator>
2966 friend constexpr year_month_weekday_last
2967 operator+(const months& __dm,
2968 const year_month_weekday_last& __ymwdl) noexcept
2969 { return __ymwdl + __dm; }
2970
2971 friend constexpr year_month_weekday_last
2972 operator+(const year_month_weekday_last& __ymwdl,
2973 const years& __dy) noexcept
2974 { return {__ymwdl.year() + __dy, __ymwdl.month(), __ymwdl.weekday_last()}; }
2975
2976 friend constexpr year_month_weekday_last
2977 operator+(const years& __dy,
2978 const year_month_weekday_last& __ymwdl) noexcept
2979 { return __ymwdl + __dy; }
2980
2981 template<typename = __detail::__months_years_conversion_disambiguator>
2982 friend constexpr year_month_weekday_last
2983 operator-(const year_month_weekday_last& __ymwdl,
2984 const months& __dm) noexcept
2985 { return __ymwdl + -__dm; }
2986
2987 friend constexpr year_month_weekday_last
2988 operator-(const year_month_weekday_last& __ymwdl,
2989 const years& __dy) noexcept
2990 { return __ymwdl + -__dy; }
2991
2992 friend constexpr year_month_weekday_last
2993 operator/(const year_month& __ym,
2994 const chrono::weekday_last& __wdl) noexcept
2995 { return {__ym.year(), __ym.month(), __wdl}; }
2996
2997 friend constexpr year_month_weekday_last
2998 operator/(const chrono::year& __y,
2999 const chrono::month_weekday_last& __mwdl) noexcept
3000 { return {__y, __mwdl.month(), __mwdl.weekday_last()}; }
3001
3002 friend constexpr year_month_weekday_last
3003 operator/(int __y, const chrono::month_weekday_last& __mwdl) noexcept
3004 { return chrono::year(__y) / __mwdl; }
3005
3006 friend constexpr year_month_weekday_last
3007 operator/(const chrono::month_weekday_last& __mwdl,
3008 const chrono::year& __y) noexcept
3009 { return __y / __mwdl; }
3010
3011 friend constexpr year_month_weekday_last
3012 operator/(const chrono::month_weekday_last& __mwdl, int __y) noexcept
3013 { return chrono::year(__y) / __mwdl; }
3014
3015 // TODO: Implement operator<<.
3016 };
3017
3018 // HH_MM_SS
3019
3020 namespace __detail
3021 {
3022 consteval long long
3023 __pow10(unsigned __n)
3024 {
3025 long long __r = 1;
3026 while (__n-- > 0)
3027 __r *= 10;
3028 return __r;
3029 }
3030 }
3031
3032 template<typename _Duration>
3033 class hh_mm_ss
3034 {
3035 private:
3036 static constexpr int
3037 _S_fractional_width()
3038 {
3039 int __multiplicity_2 = 0;
3040 int __multiplicity_5 = 0;
3041 auto __den = _Duration::period::den;
3042 while ((__den % 2) == 0)
3043 {
3044 ++__multiplicity_2;
3045 __den /= 2;
3046 }
3047 while ((__den % 5) == 0)
3048 {
3049 ++__multiplicity_5;
3050 __den /= 5;
3051 }
3052 if (__den != 1)
3053 return 6;
3054
3055 int __width = (__multiplicity_2 > __multiplicity_5
3056 ? __multiplicity_2 : __multiplicity_5);
3057 if (__width > 18)
3058 __width = 18;
3059 return __width;
3060 }
3061
3062 public:
3063 static constexpr unsigned fractional_width = {_S_fractional_width()};
3064
3065 using precision
3066 = duration<common_type_t<typename _Duration::rep,
3067 chrono::seconds::rep>,
3068 ratio<1, __detail::__pow10(fractional_width)>>;
3069
3070 constexpr
3071 hh_mm_ss() noexcept
3072 : hh_mm_ss{_Duration::zero()}
3073 { }
3074
3075 constexpr explicit
3076 hh_mm_ss(_Duration __d) noexcept
3077 : _M_is_neg (__d < _Duration::zero()),
3078 _M_h (duration_cast<chrono::hours>(abs(__d))),
3079 _M_m (duration_cast<chrono::minutes>(abs(__d) - hours())),
3080 _M_s (duration_cast<chrono::seconds>(abs(__d) - hours() - minutes()))
3081 {
3082 if constexpr (treat_as_floating_point_v<typename precision::rep>)
3083 _M_ss = abs(__d) - hours() - minutes() - seconds();
3084 else
3085 _M_ss = duration_cast<precision>(abs(__d) - hours()
3086 - minutes() - seconds());
3087 }
3088
3089 constexpr bool
3090 is_negative() const noexcept
3091 { return _M_is_neg; }
3092
3093 constexpr chrono::hours
3094 hours() const noexcept
3095 { return _M_h; }
3096
3097 constexpr chrono::minutes
3098 minutes() const noexcept
3099 { return _M_m; }
3100
3101 constexpr chrono::seconds
3102 seconds() const noexcept
3103 { return _M_s; }
3104
3105 constexpr precision
3106 subseconds() const noexcept
3107 { return _M_ss; }
3108
3109 constexpr explicit
3110 operator precision() const noexcept
3111 { return to_duration(); }
3112
3113 constexpr precision
3114 to_duration() const noexcept
3115 {
3116 if (_M_is_neg)
3117 return -(_M_h + _M_m + _M_s + _M_ss);
3118 else
3119 return _M_h + _M_m + _M_s + _M_ss;
3120 }
3121
3122 // TODO: Implement operator<<.
3123
3124 private:
3125 bool _M_is_neg;
3126 chrono::hours _M_h;
3127 chrono::minutes _M_m;
3128 chrono::seconds _M_s;
3129 precision _M_ss;
3130 };
3131#endif // C++20
3132
3133 /// @}
3134 } // namespace chrono
3135
3136#if __cplusplus > 201103L
3137
3138#define __cpp_lib_chrono_udls 201304
3139
3140 inline namespace literals
3141 {
3142 /** ISO C++ 2014 namespace for suffixes for duration literals.
3143 *
3144 * These suffixes can be used to create `chrono::duration` values with
3145 * tick periods of hours, minutes, seconds, milliseconds, microseconds
3146 * or nanoseconds. For example, `std::chrono::seconds(5)` can be written
3147 * as `5s` after making the suffix visible in the current scope.
3148 * The suffixes can be made visible by a using-directive or
3149 * using-declaration such as:
3150 * - `using namespace std::chrono_literals;`
3151 * - `using namespace std::literals;`
3152 * - `using namespace std::chrono;`
3153 * - `using namespace std;`
3154 * - `using std::chrono_literals::operator""s;`
3155 *
3156 * The result of these suffixes on an integer literal is one of the
3157 * standard typedefs such as `std::chrono::hours`.
3158 * The result on a floating-point literal is a duration type with the
3159 * specified tick period and an unspecified floating-point representation,
3160 * for example `1.5e2ms` might be equivalent to
3161 * `chrono::duration<long double, chrono::milli>(1.5e2)`.
3162 *
3163 * @ingroup chrono
3164 */
3165 inline namespace chrono_literals
3166 {
3167#pragma GCC diagnostic push
3168#pragma GCC diagnostic ignored "-Wliteral-suffix"
3169 /// @cond undocumented
3170 template<typename _Dur, char... _Digits>
3171 constexpr _Dur __check_overflow()
3172 {
3173 using _Val = __parse_int::_Parse_int<_Digits...>;
3174 constexpr typename _Dur::rep __repval = _Val::value;
3175 static_assert(__repval >= 0 && __repval == _Val::value,
3176 "literal value cannot be represented by duration type");
3177 return _Dur(__repval);
3178 }
3179 /// @endcond
3180
3181 /// Literal suffix for durations representing non-integer hours
3182 constexpr chrono::duration<long double, ratio<3600,1>>
3183 operator""h(long double __hours)
3184 { return chrono::duration<long double, ratio<3600,1>>{__hours}; }
3185
3186 /// Literal suffix for durations of type `std::chrono::hours`
3187 template <char... _Digits>
3188 constexpr chrono::hours
3189 operator""h()
3190 { return __check_overflow<chrono::hours, _Digits...>(); }
3191
3192 /// Literal suffix for durations representing non-integer minutes
3193 constexpr chrono::duration<long double, ratio<60,1>>
3194 operator""min(long double __mins)
3195 { return chrono::duration<long double, ratio<60,1>>{__mins}; }
3196
3197 /// Literal suffix for durations of type `std::chrono::minutes`
3198 template <char... _Digits>
3199 constexpr chrono::minutes
3200 operator""min()
3201 { return __check_overflow<chrono::minutes, _Digits...>(); }
3202
3203 /// Literal suffix for durations representing non-integer seconds
3204 constexpr chrono::duration<long double>
3205 operator""s(long double __secs)
3206 { return chrono::duration<long double>{__secs}; }
3207
3208 /// Literal suffix for durations of type `std::chrono::seconds`
3209 template <char... _Digits>
3210 constexpr chrono::seconds
3211 operator""s()
3212 { return __check_overflow<chrono::seconds, _Digits...>(); }
3213
3214 /// Literal suffix for durations representing non-integer milliseconds
3215 constexpr chrono::duration<long double, milli>
3216 operator""ms(long double __msecs)
3217 { return chrono::duration<long double, milli>{__msecs}; }
3218
3219 /// Literal suffix for durations of type `std::chrono::milliseconds`
3220 template <char... _Digits>
3221 constexpr chrono::milliseconds
3222 operator""ms()
3223 { return __check_overflow<chrono::milliseconds, _Digits...>(); }
3224
3225 /// Literal suffix for durations representing non-integer microseconds
3226 constexpr chrono::duration<long double, micro>
3227 operator""us(long double __usecs)
3228 { return chrono::duration<long double, micro>{__usecs}; }
3229
3230 /// Literal suffix for durations of type `std::chrono::microseconds`
3231 template <char... _Digits>
3232 constexpr chrono::microseconds
3233 operator""us()
3234 { return __check_overflow<chrono::microseconds, _Digits...>(); }
3235
3236 /// Literal suffix for durations representing non-integer nanoseconds
3237 constexpr chrono::duration<long double, nano>
3238 operator""ns(long double __nsecs)
3239 { return chrono::duration<long double, nano>{__nsecs}; }
3240
3241 /// Literal suffix for durations of type `std::chrono::nanoseconds`
3242 template <char... _Digits>
3243 constexpr chrono::nanoseconds
3244 operator""ns()
3245 { return __check_overflow<chrono::nanoseconds, _Digits...>(); }
3246
3247#if __cplusplus > 201703L
3248 constexpr chrono::day
3249 operator""d(unsigned long long __d) noexcept
3250 { return chrono::day{static_cast<unsigned>(__d)}; }
3251
3252 constexpr chrono::year
3253 operator""y(unsigned long long __y) noexcept
3254 { return chrono::year{static_cast<int>(__y)}; }
3255#endif // C++20
3256
3257#pragma GCC diagnostic pop
3258 } // inline namespace chrono_literals
3259 } // inline namespace literals
3260
3261 namespace chrono
3262 {
3263 using namespace literals::chrono_literals;
3264 } // namespace chrono
3265
3266#if __cplusplus > 201703L
3267 namespace chrono
3268 {
3269 // 12/24 HOURS FUNCTIONS
3270
3271 constexpr bool
3272 is_am(const hours& __h) noexcept
3273 { return 0h <= __h && __h <= 11h; }
3274
3275 constexpr bool
3276 is_pm(const hours& __h) noexcept
3277 { return 12h <= __h && __h <= 23h; }
3278
3279 constexpr hours
3280 make12(const hours& __h) noexcept
3281 {
3282 if (__h == 0h)
3283 return 12h;
3284 else if (__h > 12h)
3285 return __h - 12h;
3286 return __h;
3287 }
3288
3289 constexpr hours
3290 make24(const hours& __h, bool __is_pm) noexcept
3291 {
3292 if (!__is_pm)
3293 {
3294 if (__h == 12h)
3295 return 0h;
3296 else
3297 return __h;
3298 }
3299 else
3300 {
3301 if (__h == 12h)
3302 return __h;
3303 else
3304 return __h + 12h;
3305 }
3306 }
3307 }
3308#endif
3309
3310#if __cplusplus >= 201703L
3311 namespace filesystem
3312 {
3313 struct __file_clock
3314 {
3315 using duration = chrono::nanoseconds;
3316 using rep = duration::rep;
3317 using period = duration::period;
3318 using time_point = chrono::time_point<__file_clock>;
3319 static constexpr bool is_steady = false;
3320
3321 static time_point
3322 now() noexcept
3323 { return _S_from_sys(chrono::system_clock::now()); }
3324
3325#if __cplusplus > 201703L
3326 template<typename _Dur>
3327 static
3328 chrono::file_time<_Dur>
3329 from_sys(const chrono::sys_time<_Dur>& __t) noexcept
3330 { return _S_from_sys(__t); }
3331
3332 // For internal use only
3333 template<typename _Dur>
3334 static
3335 chrono::sys_time<_Dur>
3336 to_sys(const chrono::file_time<_Dur>& __t) noexcept
3337 { return _S_to_sys(__t); }
3338#endif // C++20
3339
3340 private:
3341 using __sys_clock = chrono::system_clock;
3342
3343 // This clock's (unspecified) epoch is 2174-01-01 00:00:00 UTC.
3344 // A signed 64-bit duration with nanosecond resolution gives roughly
3345 // +/- 292 years, which covers the 1901-2446 date range for ext4.
3346 static constexpr chrono::seconds _S_epoch_diff{6437664000};
3347
3348 protected:
3349 // For internal use only
3350 template<typename _Dur>
3351 static
3352 chrono::time_point<__file_clock, _Dur>
3353 _S_from_sys(const chrono::time_point<__sys_clock, _Dur>& __t) noexcept
3354 {
3355 using __file_time = chrono::time_point<__file_clock, _Dur>;
3356 return __file_time{__t.time_since_epoch()} - _S_epoch_diff;
3357 }
3358
3359 // For internal use only
3360 template<typename _Dur>
3361 static
3362 chrono::time_point<__sys_clock, _Dur>
3363 _S_to_sys(const chrono::time_point<__file_clock, _Dur>& __t) noexcept
3364 {
3365 using __sys_time = chrono::time_point<__sys_clock, _Dur>;
3366 return __sys_time{__t.time_since_epoch()} + _S_epoch_diff;
3367 }
3368 };
3369 } // namespace filesystem
3370#endif // C++17
3371#endif // C++14
3372
3373_GLIBCXX_END_NAMESPACE_VERSION
3374} // namespace std
3375
3376#endif // C++11
3377
3378#endif //_GLIBCXX_CHRONO
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