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1 | // <chrono> -*- C++ -*- | |
2 | ||
3 | // Copyright (C) 2008-2024 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 | #include <bits/requires_hosted.h> // for <ctime> and clocks | |
36 | ||
37 | #if __cplusplus < 201103L | |
38 | # include <bits/c++0x_warning.h> | |
39 | #else | |
40 | ||
41 | #include <bits/chrono.h> | |
42 | ||
43 | #if __cplusplus >= 202002L | |
44 | # include <bit> | |
45 | # include <sstream> | |
46 | # include <string> | |
47 | # include <vector> | |
48 | # include <bits/stl_algo.h> // upper_bound | |
49 | # include <bits/shared_ptr.h> | |
50 | # include <bits/unique_ptr.h> | |
51 | #endif | |
52 | ||
53 | #define __glibcxx_want_chrono | |
54 | #define __glibcxx_want_chrono_udls | |
55 | #include <bits/version.h> | |
56 | ||
57 | namespace std _GLIBCXX_VISIBILITY(default) | |
58 | { | |
59 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
60 | ||
61 | /** | |
62 | * @defgroup chrono Time | |
63 | * @ingroup utilities | |
64 | * | |
65 | * Classes and functions for time. | |
66 | * | |
67 | * @since C++11 | |
68 | */ | |
69 | ||
70 | /** @namespace std::chrono | |
71 | * @brief ISO C++ 2011 namespace for date and time utilities | |
72 | * @ingroup chrono | |
73 | */ | |
74 | namespace chrono | |
75 | { | |
76 | #if __cplusplus >= 202002L | |
77 | /// @addtogroup chrono | |
78 | /// @{ | |
79 | struct local_t { }; | |
80 | template<typename _Duration> | |
81 | using local_time = time_point<local_t, _Duration>; | |
82 | using local_seconds = local_time<seconds>; | |
83 | using local_days = local_time<days>; | |
84 | ||
85 | class utc_clock; | |
86 | class tai_clock; | |
87 | class gps_clock; | |
88 | ||
89 | template<typename _Duration> | |
90 | using utc_time = time_point<utc_clock, _Duration>; | |
91 | using utc_seconds = utc_time<seconds>; | |
92 | ||
93 | template<typename _Duration> | |
94 | using tai_time = time_point<tai_clock, _Duration>; | |
95 | using tai_seconds = tai_time<seconds>; | |
96 | ||
97 | template<typename _Duration> | |
98 | using gps_time = time_point<gps_clock, _Duration>; | |
99 | using gps_seconds = gps_time<seconds>; | |
100 | ||
101 | template<> struct is_clock<utc_clock> : true_type { }; | |
102 | template<> struct is_clock<tai_clock> : true_type { }; | |
103 | template<> struct is_clock<gps_clock> : true_type { }; | |
104 | ||
105 | template<> inline constexpr bool is_clock_v<utc_clock> = true; | |
106 | template<> inline constexpr bool is_clock_v<tai_clock> = true; | |
107 | template<> inline constexpr bool is_clock_v<gps_clock> = true; | |
108 | ||
109 | struct leap_second_info | |
110 | { | |
111 | bool is_leap_second; | |
112 | seconds elapsed; | |
113 | }; | |
114 | ||
115 | template<typename _Duration> | |
116 | leap_second_info | |
117 | get_leap_second_info(const utc_time<_Duration>& __ut); | |
118 | ||
119 | /** A clock that measures Universal Coordinated Time (UTC). | |
120 | * | |
121 | * The epoch is 1970-01-01 00:00:00. | |
122 | * | |
123 | * @since C++20 | |
124 | */ | |
125 | class utc_clock | |
126 | { | |
127 | public: | |
128 | using rep = system_clock::rep; | |
129 | using period = system_clock::period; | |
130 | using duration = chrono::duration<rep, period>; | |
131 | using time_point = chrono::time_point<utc_clock>; | |
132 | static constexpr bool is_steady = false; | |
133 | ||
134 | [[nodiscard]] | |
135 | static time_point | |
136 | now() | |
137 | { return from_sys(system_clock::now()); } | |
138 | ||
139 | template<typename _Duration> | |
140 | [[nodiscard]] | |
141 | static sys_time<common_type_t<_Duration, seconds>> | |
142 | to_sys(const utc_time<_Duration>& __t) | |
143 | { | |
144 | using _CDur = common_type_t<_Duration, seconds>; | |
145 | const auto __li = chrono::get_leap_second_info(__t); | |
146 | sys_time<_CDur> __s{__t.time_since_epoch() - __li.elapsed}; | |
147 | if (__li.is_leap_second) | |
148 | __s = chrono::floor<seconds>(__s) + seconds{1} - _CDur{1}; | |
149 | return __s; | |
150 | } | |
151 | ||
152 | template<typename _Duration> | |
153 | [[nodiscard]] | |
154 | static utc_time<common_type_t<_Duration, seconds>> | |
155 | from_sys(const sys_time<_Duration>& __t); | |
156 | }; | |
157 | ||
158 | /** A clock that measures International Atomic Time. | |
159 | * | |
160 | * The epoch is 1958-01-01 00:00:00. | |
161 | * | |
162 | * @since C++20 | |
163 | */ | |
164 | class tai_clock | |
165 | { | |
166 | public: | |
167 | using rep = system_clock::rep; | |
168 | using period = system_clock::period; | |
169 | using duration = chrono::duration<rep, period>; | |
170 | using time_point = chrono::time_point<tai_clock>; | |
171 | static constexpr bool is_steady = false; // XXX true for CLOCK_TAI? | |
172 | ||
173 | // TODO move into lib, use CLOCK_TAI on linux, add extension point. | |
174 | [[nodiscard]] | |
175 | static time_point | |
176 | now() | |
177 | { return from_utc(utc_clock::now()); } | |
178 | ||
179 | template<typename _Duration> | |
180 | [[nodiscard]] | |
181 | static utc_time<common_type_t<_Duration, seconds>> | |
182 | to_utc(const tai_time<_Duration>& __t) | |
183 | { | |
184 | using _CDur = common_type_t<_Duration, seconds>; | |
185 | return utc_time<_CDur>{__t.time_since_epoch()} - 378691210s; | |
186 | } | |
187 | ||
188 | template<typename _Duration> | |
189 | [[nodiscard]] | |
190 | static tai_time<common_type_t<_Duration, seconds>> | |
191 | from_utc(const utc_time<_Duration>& __t) | |
192 | { | |
193 | using _CDur = common_type_t<_Duration, seconds>; | |
194 | return tai_time<_CDur>{__t.time_since_epoch()} + 378691210s; | |
195 | } | |
196 | }; | |
197 | ||
198 | /** A clock that measures GPS time. | |
199 | * | |
200 | * The epoch is 1980-01-06 00:00:00. | |
201 | * | |
202 | * @since C++20 | |
203 | */ | |
204 | class gps_clock | |
205 | { | |
206 | public: | |
207 | using rep = system_clock::rep; | |
208 | using period = system_clock::period; | |
209 | using duration = chrono::duration<rep, period>; | |
210 | using time_point = chrono::time_point<gps_clock>; | |
211 | static constexpr bool is_steady = false; // XXX | |
212 | ||
213 | // TODO move into lib, add extension point. | |
214 | [[nodiscard]] | |
215 | static time_point | |
216 | now() | |
217 | { return from_utc(utc_clock::now()); } | |
218 | ||
219 | template<typename _Duration> | |
220 | [[nodiscard]] | |
221 | static utc_time<common_type_t<_Duration, seconds>> | |
222 | to_utc(const gps_time<_Duration>& __t) | |
223 | { | |
224 | using _CDur = common_type_t<_Duration, seconds>; | |
225 | return utc_time<_CDur>{__t.time_since_epoch()} + 315964809s; | |
226 | } | |
227 | ||
228 | template<typename _Duration> | |
229 | [[nodiscard]] | |
230 | static gps_time<common_type_t<_Duration, seconds>> | |
231 | from_utc(const utc_time<_Duration>& __t) | |
232 | { | |
233 | using _CDur = common_type_t<_Duration, seconds>; | |
234 | return gps_time<_CDur>{__t.time_since_epoch()} - 315964809s; | |
235 | } | |
236 | }; | |
237 | ||
238 | ||
239 | template<typename _DestClock, typename _SourceClock> | |
240 | struct clock_time_conversion | |
241 | { }; | |
242 | ||
243 | // Identity conversions | |
244 | ||
245 | template<typename _Clock> | |
246 | struct clock_time_conversion<_Clock, _Clock> | |
247 | { | |
248 | template<typename _Duration> | |
249 | time_point<_Clock, _Duration> | |
250 | operator()(const time_point<_Clock, _Duration>& __t) const | |
251 | { return __t; } | |
252 | }; | |
253 | ||
254 | template<> | |
255 | struct clock_time_conversion<system_clock, system_clock> | |
256 | { | |
257 | template<typename _Duration> | |
258 | sys_time<_Duration> | |
259 | operator()(const sys_time<_Duration>& __t) const | |
260 | { return __t; } | |
261 | }; | |
262 | ||
263 | template<> | |
264 | struct clock_time_conversion<utc_clock, utc_clock> | |
265 | { | |
266 | template<typename _Duration> | |
267 | utc_time<_Duration> | |
268 | operator()(const utc_time<_Duration>& __t) const | |
269 | { return __t; } | |
270 | }; | |
271 | ||
272 | // Conversions between system_clock and utc_clock | |
273 | ||
274 | template<> | |
275 | struct clock_time_conversion<utc_clock, system_clock> | |
276 | { | |
277 | template<typename _Duration> | |
278 | utc_time<common_type_t<_Duration, seconds>> | |
279 | operator()(const sys_time<_Duration>& __t) const | |
280 | { return utc_clock::from_sys(__t); } | |
281 | }; | |
282 | ||
283 | template<> | |
284 | struct clock_time_conversion<system_clock, utc_clock> | |
285 | { | |
286 | template<typename _Duration> | |
287 | sys_time<common_type_t<_Duration, seconds>> | |
288 | operator()(const utc_time<_Duration>& __t) const | |
289 | { return utc_clock::to_sys(__t); } | |
290 | }; | |
291 | ||
292 | template<typename _Tp, typename _Clock> | |
293 | inline constexpr bool __is_time_point_for_v = false; | |
294 | ||
295 | template<typename _Clock, typename _Duration> | |
296 | inline constexpr bool | |
297 | __is_time_point_for_v<time_point<_Clock, _Duration>, _Clock> = true; | |
298 | ||
299 | // Conversions between system_clock and other clocks | |
300 | ||
301 | template<typename _SourceClock> | |
302 | struct clock_time_conversion<system_clock, _SourceClock> | |
303 | { | |
304 | template<typename _Duration, typename _Src = _SourceClock> | |
305 | auto | |
306 | operator()(const time_point<_SourceClock, _Duration>& __t) const | |
307 | -> decltype(_Src::to_sys(__t)) | |
308 | { | |
309 | using _Ret = decltype(_SourceClock::to_sys(__t)); | |
310 | static_assert(__is_time_point_for_v<_Ret, system_clock>); | |
311 | return _SourceClock::to_sys(__t); | |
312 | } | |
313 | }; | |
314 | ||
315 | template<typename _DestClock> | |
316 | struct clock_time_conversion<_DestClock, system_clock> | |
317 | { | |
318 | template<typename _Duration, typename _Dest = _DestClock> | |
319 | auto | |
320 | operator()(const sys_time<_Duration>& __t) const | |
321 | -> decltype(_Dest::from_sys(__t)) | |
322 | { | |
323 | using _Ret = decltype(_DestClock::from_sys(__t)); | |
324 | static_assert(__is_time_point_for_v<_Ret, _DestClock>); | |
325 | return _DestClock::from_sys(__t); | |
326 | } | |
327 | }; | |
328 | ||
329 | // Conversions between utc_clock and other clocks | |
330 | ||
331 | template<typename _SourceClock> | |
332 | struct clock_time_conversion<utc_clock, _SourceClock> | |
333 | { | |
334 | template<typename _Duration, typename _Src = _SourceClock> | |
335 | auto | |
336 | operator()(const time_point<_SourceClock, _Duration>& __t) const | |
337 | -> decltype(_Src::to_utc(__t)) | |
338 | { | |
339 | using _Ret = decltype(_SourceClock::to_utc(__t)); | |
340 | static_assert(__is_time_point_for_v<_Ret, utc_clock>); | |
341 | return _SourceClock::to_utc(__t); | |
342 | } | |
343 | }; | |
344 | ||
345 | template<typename _DestClock> | |
346 | struct clock_time_conversion<_DestClock, utc_clock> | |
347 | { | |
348 | template<typename _Duration, typename _Dest = _DestClock> | |
349 | auto | |
350 | operator()(const utc_time<_Duration>& __t) const | |
351 | -> decltype(_Dest::from_utc(__t)) | |
352 | { | |
353 | using _Ret = decltype(_DestClock::from_utc(__t)); | |
354 | static_assert(__is_time_point_for_v<_Ret, _DestClock>); | |
355 | return _DestClock::from_utc(__t); | |
356 | } | |
357 | }; | |
358 | ||
359 | /// @cond undocumented | |
360 | namespace __detail | |
361 | { | |
362 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
363 | concept __clock_convs | |
364 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
365 | clock_time_conversion<_DestClock, _SourceClock>{}(__t); | |
366 | }; | |
367 | ||
368 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
369 | concept __clock_convs_sys | |
370 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
371 | clock_time_conversion<_DestClock, system_clock>{}( | |
372 | clock_time_conversion<system_clock, _SourceClock>{}(__t)); | |
373 | }; | |
374 | ||
375 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
376 | concept __clock_convs_utc | |
377 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
378 | clock_time_conversion<_DestClock, utc_clock>{}( | |
379 | clock_time_conversion<utc_clock, _SourceClock>{}(__t)); | |
380 | }; | |
381 | ||
382 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
383 | concept __clock_convs_sys_utc | |
384 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
385 | clock_time_conversion<_DestClock, utc_clock>{}( | |
386 | clock_time_conversion<utc_clock, system_clock>{}( | |
387 | clock_time_conversion<system_clock, _SourceClock>{}(__t))); | |
388 | }; | |
389 | ||
390 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
391 | concept __clock_convs_utc_sys | |
392 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
393 | clock_time_conversion<_DestClock, system_clock>{}( | |
394 | clock_time_conversion<system_clock, utc_clock>{}( | |
395 | clock_time_conversion<utc_clock, _SourceClock>{}(__t))); | |
396 | }; | |
397 | ||
398 | } // namespace __detail | |
399 | /// @endcond | |
400 | ||
401 | /// Convert a time point to a different clock. | |
402 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
403 | [[nodiscard]] | |
404 | inline auto | |
405 | clock_cast(const time_point<_SourceClock, _Duration>& __t) | |
406 | requires __detail::__clock_convs<_DestClock, _SourceClock, _Duration> | |
407 | || __detail::__clock_convs_sys<_DestClock, _SourceClock, _Duration> | |
408 | || __detail::__clock_convs_utc<_DestClock, _SourceClock, _Duration> | |
409 | || __detail::__clock_convs_sys_utc<_DestClock, _SourceClock, _Duration> | |
410 | || __detail::__clock_convs_utc_sys<_DestClock, _SourceClock, _Duration> | |
411 | { | |
412 | constexpr bool __direct | |
413 | = __detail::__clock_convs<_DestClock, _SourceClock, _Duration>; | |
414 | if constexpr (__direct) | |
415 | { | |
416 | return clock_time_conversion<_DestClock, _SourceClock>{}(__t); | |
417 | } | |
418 | else | |
419 | { | |
420 | constexpr bool __convert_via_sys_clock | |
421 | = __detail::__clock_convs_sys<_DestClock, _SourceClock, _Duration>; | |
422 | constexpr bool __convert_via_utc_clock | |
423 | = __detail::__clock_convs_utc<_DestClock, _SourceClock, _Duration>; | |
424 | if constexpr (__convert_via_sys_clock) | |
425 | { | |
426 | static_assert(!__convert_via_utc_clock, | |
427 | "clock_cast requires a unique best conversion, but " | |
428 | "conversion is possible via system_clock and also via" | |
429 | "utc_clock"); | |
430 | return clock_time_conversion<_DestClock, system_clock>{}( | |
431 | clock_time_conversion<system_clock, _SourceClock>{}(__t)); | |
432 | } | |
433 | else if constexpr (__convert_via_utc_clock) | |
434 | { | |
435 | return clock_time_conversion<_DestClock, utc_clock>{}( | |
436 | clock_time_conversion<utc_clock, _SourceClock>{}(__t)); | |
437 | } | |
438 | else | |
439 | { | |
440 | constexpr bool __convert_via_sys_and_utc_clocks | |
441 | = __detail::__clock_convs_sys_utc<_DestClock, | |
442 | _SourceClock, | |
443 | _Duration>; | |
444 | ||
445 | if constexpr (__convert_via_sys_and_utc_clocks) | |
446 | { | |
447 | constexpr bool __convert_via_utc_and_sys_clocks | |
448 | = __detail::__clock_convs_utc_sys<_DestClock, | |
449 | _SourceClock, | |
450 | _Duration>; | |
451 | static_assert(!__convert_via_utc_and_sys_clocks, | |
452 | "clock_cast requires a unique best conversion, but " | |
453 | "conversion is possible via system_clock followed by " | |
454 | "utc_clock, and also via utc_clock followed by " | |
455 | "system_clock"); | |
456 | return clock_time_conversion<_DestClock, utc_clock>{}( | |
457 | clock_time_conversion<utc_clock, system_clock>{}( | |
458 | clock_time_conversion<system_clock, _SourceClock>{}(__t))); | |
459 | } | |
460 | else | |
461 | { | |
462 | return clock_time_conversion<_DestClock, system_clock>{}( | |
463 | clock_time_conversion<system_clock, utc_clock>{}( | |
464 | clock_time_conversion<utc_clock, _SourceClock>{}(__t))); | |
465 | } | |
466 | } | |
467 | } | |
468 | } | |
469 | ||
470 | // CALENDRICAL TYPES | |
471 | ||
472 | // CLASS DECLARATIONS | |
473 | class day; | |
474 | class month; | |
475 | class year; | |
476 | class weekday; | |
477 | class weekday_indexed; | |
478 | class weekday_last; | |
479 | class month_day; | |
480 | class month_day_last; | |
481 | class month_weekday; | |
482 | class month_weekday_last; | |
483 | class year_month; | |
484 | class year_month_day; | |
485 | class year_month_day_last; | |
486 | class year_month_weekday; | |
487 | class year_month_weekday_last; | |
488 | ||
489 | struct last_spec | |
490 | { | |
491 | explicit last_spec() = default; | |
492 | ||
493 | friend constexpr month_day_last | |
494 | operator/(int __m, last_spec) noexcept; | |
495 | ||
496 | friend constexpr month_day_last | |
497 | operator/(last_spec, int __m) noexcept; | |
498 | }; | |
499 | ||
500 | inline constexpr last_spec last{}; | |
501 | ||
502 | namespace __detail | |
503 | { | |
504 | // Compute the remainder of the Euclidean division of __n divided by __d. | |
505 | // Euclidean division truncates toward negative infinity and always | |
506 | // produces a remainder in the range of [0,__d-1] (whereas standard | |
507 | // division truncates toward zero and yields a nonpositive remainder | |
508 | // for negative __n). | |
509 | constexpr unsigned | |
510 | __modulo(long long __n, unsigned __d) | |
511 | { | |
512 | if (__n >= 0) | |
513 | return __n % __d; | |
514 | else | |
515 | return (__d + (__n % __d)) % __d; | |
516 | } | |
517 | ||
518 | inline constexpr unsigned __days_per_month[12] | |
519 | = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; | |
520 | } | |
521 | ||
522 | // DAY | |
523 | ||
524 | class day | |
525 | { | |
526 | private: | |
527 | unsigned char _M_d; | |
528 | ||
529 | public: | |
530 | day() = default; | |
531 | ||
532 | explicit constexpr | |
533 | day(unsigned __d) noexcept | |
534 | : _M_d(__d) | |
535 | { } | |
536 | ||
537 | constexpr day& | |
538 | operator++() noexcept | |
539 | { | |
540 | ++_M_d; | |
541 | return *this; | |
542 | } | |
543 | ||
544 | constexpr day | |
545 | operator++(int) noexcept | |
546 | { | |
547 | auto __ret = *this; | |
548 | ++(*this); | |
549 | return __ret; | |
550 | } | |
551 | ||
552 | constexpr day& | |
553 | operator--() noexcept | |
554 | { | |
555 | --_M_d; | |
556 | return *this; | |
557 | } | |
558 | ||
559 | constexpr day | |
560 | operator--(int) noexcept | |
561 | { | |
562 | auto __ret = *this; | |
563 | --(*this); | |
564 | return __ret; | |
565 | } | |
566 | ||
567 | constexpr day& | |
568 | operator+=(const days& __d) noexcept | |
569 | { | |
570 | *this = *this + __d; | |
571 | return *this; | |
572 | } | |
573 | ||
574 | constexpr day& | |
575 | operator-=(const days& __d) noexcept | |
576 | { | |
577 | *this = *this - __d; | |
578 | return *this; | |
579 | } | |
580 | ||
581 | constexpr explicit | |
582 | operator unsigned() const noexcept | |
583 | { return _M_d; } | |
584 | ||
585 | constexpr bool | |
586 | ok() const noexcept | |
587 | { return 1 <= _M_d && _M_d <= 31; } | |
588 | ||
589 | friend constexpr bool | |
590 | operator==(const day& __x, const day& __y) noexcept | |
591 | { return unsigned{__x} == unsigned{__y}; } | |
592 | ||
593 | friend constexpr strong_ordering | |
594 | operator<=>(const day& __x, const day& __y) noexcept | |
595 | { return unsigned{__x} <=> unsigned{__y}; } | |
596 | ||
597 | friend constexpr day | |
598 | operator+(const day& __x, const days& __y) noexcept | |
599 | { return day(unsigned{__x} + __y.count()); } | |
600 | ||
601 | friend constexpr day | |
602 | operator+(const days& __x, const day& __y) noexcept | |
603 | { return __y + __x; } | |
604 | ||
605 | friend constexpr day | |
606 | operator-(const day& __x, const days& __y) noexcept | |
607 | { return __x + -__y; } | |
608 | ||
609 | friend constexpr days | |
610 | operator-(const day& __x, const day& __y) noexcept | |
611 | { return days{int(unsigned{__x}) - int(unsigned{__y})}; } | |
612 | ||
613 | friend constexpr month_day | |
614 | operator/(const month& __m, const day& __d) noexcept; | |
615 | ||
616 | friend constexpr month_day | |
617 | operator/(int __m, const day& __d) noexcept; | |
618 | ||
619 | friend constexpr month_day | |
620 | operator/(const day& __d, const month& __m) noexcept; | |
621 | ||
622 | friend constexpr month_day | |
623 | operator/(const day& __d, int __m) noexcept; | |
624 | ||
625 | friend constexpr year_month_day | |
626 | operator/(const year_month& __ym, const day& __d) noexcept; | |
627 | }; | |
628 | ||
629 | // MONTH | |
630 | ||
631 | class month | |
632 | { | |
633 | private: | |
634 | unsigned char _M_m; | |
635 | ||
636 | public: | |
637 | month() = default; | |
638 | ||
639 | explicit constexpr | |
640 | month(unsigned __m) noexcept | |
641 | : _M_m(__m) | |
642 | { } | |
643 | ||
644 | constexpr month& | |
645 | operator++() noexcept | |
646 | { | |
647 | *this += months{1}; | |
648 | return *this; | |
649 | } | |
650 | ||
651 | constexpr month | |
652 | operator++(int) noexcept | |
653 | { | |
654 | auto __ret = *this; | |
655 | ++(*this); | |
656 | return __ret; | |
657 | } | |
658 | ||
659 | constexpr month& | |
660 | operator--() noexcept | |
661 | { | |
662 | *this -= months{1}; | |
663 | return *this; | |
664 | } | |
665 | ||
666 | constexpr month | |
667 | operator--(int) noexcept | |
668 | { | |
669 | auto __ret = *this; | |
670 | --(*this); | |
671 | return __ret; | |
672 | } | |
673 | ||
674 | constexpr month& | |
675 | operator+=(const months& __m) noexcept | |
676 | { | |
677 | *this = *this + __m; | |
678 | return *this; | |
679 | } | |
680 | ||
681 | constexpr month& | |
682 | operator-=(const months& __m) noexcept | |
683 | { | |
684 | *this = *this - __m; | |
685 | return *this; | |
686 | } | |
687 | ||
688 | explicit constexpr | |
689 | operator unsigned() const noexcept | |
690 | { return _M_m; } | |
691 | ||
692 | constexpr bool | |
693 | ok() const noexcept | |
694 | { return 1 <= _M_m && _M_m <= 12; } | |
695 | ||
696 | friend constexpr bool | |
697 | operator==(const month& __x, const month& __y) noexcept | |
698 | { return unsigned{__x} == unsigned{__y}; } | |
699 | ||
700 | friend constexpr strong_ordering | |
701 | operator<=>(const month& __x, const month& __y) noexcept | |
702 | { return unsigned{__x} <=> unsigned{__y}; } | |
703 | ||
704 | friend constexpr month | |
705 | operator+(const month& __x, const months& __y) noexcept | |
706 | { | |
707 | auto __n = static_cast<long long>(unsigned{__x}) + (__y.count() - 1); | |
708 | return month{__detail::__modulo(__n, 12) + 1}; | |
709 | } | |
710 | ||
711 | friend constexpr month | |
712 | operator+(const months& __x, const month& __y) noexcept | |
713 | { return __y + __x; } | |
714 | ||
715 | friend constexpr month | |
716 | operator-(const month& __x, const months& __y) noexcept | |
717 | { return __x + -__y; } | |
718 | ||
719 | friend constexpr months | |
720 | operator-(const month& __x, const month& __y) noexcept | |
721 | { | |
722 | const auto __dm = int(unsigned(__x)) - int(unsigned(__y)); | |
723 | return months{__dm < 0 ? 12 + __dm : __dm}; | |
724 | } | |
725 | ||
726 | friend constexpr year_month | |
727 | operator/(const year& __y, const month& __m) noexcept; | |
728 | ||
729 | friend constexpr month_day | |
730 | operator/(const month& __m, int __d) noexcept; | |
731 | ||
732 | friend constexpr month_day_last | |
733 | operator/(const month& __m, last_spec) noexcept; | |
734 | ||
735 | friend constexpr month_day_last | |
736 | operator/(last_spec, const month& __m) noexcept; | |
737 | ||
738 | friend constexpr month_weekday | |
739 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; | |
740 | ||
741 | friend constexpr month_weekday | |
742 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; | |
743 | ||
744 | friend constexpr month_weekday_last | |
745 | operator/(const month& __m, const weekday_last& __wdl) noexcept; | |
746 | ||
747 | friend constexpr month_weekday_last | |
748 | operator/(const weekday_last& __wdl, const month& __m) noexcept; | |
749 | }; | |
750 | ||
751 | inline constexpr month January{1}; | |
752 | inline constexpr month February{2}; | |
753 | inline constexpr month March{3}; | |
754 | inline constexpr month April{4}; | |
755 | inline constexpr month May{5}; | |
756 | inline constexpr month June{6}; | |
757 | inline constexpr month July{7}; | |
758 | inline constexpr month August{8}; | |
759 | inline constexpr month September{9}; | |
760 | inline constexpr month October{10}; | |
761 | inline constexpr month November{11}; | |
762 | inline constexpr month December{12}; | |
763 | ||
764 | // YEAR | |
765 | ||
766 | class year | |
767 | { | |
768 | private: | |
769 | short _M_y; | |
770 | ||
771 | public: | |
772 | year() = default; | |
773 | ||
774 | explicit constexpr | |
775 | year(int __y) noexcept | |
776 | : _M_y{static_cast<short>(__y)} | |
777 | { } | |
778 | ||
779 | static constexpr year | |
780 | min() noexcept | |
781 | { return year{-32767}; } | |
782 | ||
783 | static constexpr year | |
784 | max() noexcept | |
785 | { return year{32767}; } | |
786 | ||
787 | constexpr year& | |
788 | operator++() noexcept | |
789 | { | |
790 | ++_M_y; | |
791 | return *this; | |
792 | } | |
793 | ||
794 | constexpr year | |
795 | operator++(int) noexcept | |
796 | { | |
797 | auto __ret = *this; | |
798 | ++(*this); | |
799 | return __ret; | |
800 | } | |
801 | ||
802 | constexpr year& | |
803 | operator--() noexcept | |
804 | { | |
805 | --_M_y; | |
806 | return *this; | |
807 | } | |
808 | ||
809 | constexpr year | |
810 | operator--(int) noexcept | |
811 | { | |
812 | auto __ret = *this; | |
813 | --(*this); | |
814 | return __ret; | |
815 | } | |
816 | ||
817 | constexpr year& | |
818 | operator+=(const years& __y) noexcept | |
819 | { | |
820 | *this = *this + __y; | |
821 | return *this; | |
822 | } | |
823 | ||
824 | constexpr year& | |
825 | operator-=(const years& __y) noexcept | |
826 | { | |
827 | *this = *this - __y; | |
828 | return *this; | |
829 | } | |
830 | ||
831 | constexpr year | |
832 | operator+() const noexcept | |
833 | { return *this; } | |
834 | ||
835 | constexpr year | |
836 | operator-() const noexcept | |
837 | { return year{-_M_y}; } | |
838 | ||
839 | constexpr bool | |
840 | is_leap() const noexcept | |
841 | { | |
842 | // Testing divisibility by 100 first gives better performance [1], i.e., | |
843 | // return _M_y % 100 == 0 ? _M_y % 400 == 0 : _M_y % 16 == 0; | |
844 | // Furthermore, if _M_y % 100 == 0, then _M_y % 400 == 0 is equivalent | |
845 | // to _M_y % 16 == 0, so we can simplify it to | |
846 | // return _M_y % 100 == 0 ? _M_y % 16 == 0 : _M_y % 4 == 0. // #1 | |
847 | // Similarly, we can replace 100 with 25 (which is good since | |
848 | // _M_y % 25 == 0 requires one fewer instruction than _M_y % 100 == 0 | |
849 | // [2]): | |
850 | // return _M_y % 25 == 0 ? _M_y % 16 == 0 : _M_y % 4 == 0. // #2 | |
851 | // Indeed, first assume _M_y % 4 != 0. Then _M_y % 16 != 0 and hence, | |
852 | // _M_y % 4 == 0 and _M_y % 16 == 0 are both false. Therefore, #2 | |
853 | // returns false as it should (regardless of _M_y % 25.) Now assume | |
854 | // _M_y % 4 == 0. In this case, _M_y % 25 == 0 if, and only if, | |
855 | // _M_y % 100 == 0, that is, #1 and #2 are equivalent. Finally, #2 is | |
856 | // equivalent to | |
857 | // return (_M_y & (_M_y % 25 == 0 ? 15 : 3)) == 0. | |
858 | ||
859 | // References: | |
860 | // [1] https://github.com/cassioneri/calendar | |
861 | // [2] https://godbolt.org/z/55G8rn77e | |
862 | // [3] https://gcc.gnu.org/pipermail/libstdc++/2021-June/052815.html | |
863 | ||
864 | return (_M_y & (_M_y % 25 == 0 ? 15 : 3)) == 0; | |
865 | } | |
866 | ||
867 | explicit constexpr | |
868 | operator int() const noexcept | |
869 | { return _M_y; } | |
870 | ||
871 | constexpr bool | |
872 | ok() const noexcept | |
873 | { return min()._M_y <= _M_y && _M_y <= max()._M_y; } | |
874 | ||
875 | friend constexpr bool | |
876 | operator==(const year& __x, const year& __y) noexcept | |
877 | { return int{__x} == int{__y}; } | |
878 | ||
879 | friend constexpr strong_ordering | |
880 | operator<=>(const year& __x, const year& __y) noexcept | |
881 | { return int{__x} <=> int{__y}; } | |
882 | ||
883 | friend constexpr year | |
884 | operator+(const year& __x, const years& __y) noexcept | |
885 | { return year{int{__x} + static_cast<int>(__y.count())}; } | |
886 | ||
887 | friend constexpr year | |
888 | operator+(const years& __x, const year& __y) noexcept | |
889 | { return __y + __x; } | |
890 | ||
891 | friend constexpr year | |
892 | operator-(const year& __x, const years& __y) noexcept | |
893 | { return __x + -__y; } | |
894 | ||
895 | friend constexpr years | |
896 | operator-(const year& __x, const year& __y) noexcept | |
897 | { return years{int{__x} - int{__y}}; } | |
898 | ||
899 | friend constexpr year_month | |
900 | operator/(const year& __y, int __m) noexcept; | |
901 | ||
902 | friend constexpr year_month_day | |
903 | operator/(const year& __y, const month_day& __md) noexcept; | |
904 | ||
905 | friend constexpr year_month_day | |
906 | operator/(const month_day& __md, const year& __y) noexcept; | |
907 | ||
908 | friend constexpr year_month_day_last | |
909 | operator/(const year& __y, const month_day_last& __mdl) noexcept; | |
910 | ||
911 | friend constexpr year_month_day_last | |
912 | operator/(const month_day_last& __mdl, const year& __y) noexcept; | |
913 | ||
914 | friend constexpr year_month_weekday | |
915 | operator/(const year& __y, const month_weekday& __mwd) noexcept; | |
916 | ||
917 | friend constexpr year_month_weekday | |
918 | operator/(const month_weekday& __mwd, const year& __y) noexcept; | |
919 | ||
920 | friend constexpr year_month_weekday_last | |
921 | operator/(const year& __y, const month_weekday_last& __mwdl) noexcept; | |
922 | ||
923 | friend constexpr year_month_weekday_last | |
924 | operator/(const month_weekday_last& __mwdl, const year& __y) noexcept; | |
925 | }; | |
926 | ||
927 | // WEEKDAY | |
928 | ||
929 | class weekday | |
930 | { | |
931 | private: | |
932 | unsigned char _M_wd; | |
933 | ||
934 | static constexpr weekday | |
935 | _S_from_days(const days& __d) | |
936 | { | |
937 | using _Rep = days::rep; | |
938 | using _URep = make_unsigned_t<_Rep>; | |
939 | const auto __n = __d.count(); | |
940 | const auto __m = static_cast<_URep>(__n); | |
941 | ||
942 | // 1970-01-01 (__n = 0, __m = 0 ) -> Thursday (4) | |
943 | // 1969-31-12 (__n = -1, __m = _URep(-1)) -> Wednesday (3) | |
944 | const auto __offset = __n >= 0 ? _URep(4) : 3 - _URep(-1) % 7 - 7; | |
945 | return weekday((__m + __offset) % 7); | |
946 | } | |
947 | ||
948 | public: | |
949 | weekday() = default; | |
950 | ||
951 | explicit constexpr | |
952 | weekday(unsigned __wd) noexcept | |
953 | : _M_wd(__wd == 7 ? 0 : __wd) // __wd % 7 ? | |
954 | { } | |
955 | ||
956 | constexpr | |
957 | weekday(const sys_days& __dp) noexcept | |
958 | : weekday{_S_from_days(__dp.time_since_epoch())} | |
959 | { } | |
960 | ||
961 | explicit constexpr | |
962 | weekday(const local_days& __dp) noexcept | |
963 | : weekday{sys_days{__dp.time_since_epoch()}} | |
964 | { } | |
965 | ||
966 | constexpr weekday& | |
967 | operator++() noexcept | |
968 | { | |
969 | *this += days{1}; | |
970 | return *this; | |
971 | } | |
972 | ||
973 | constexpr weekday | |
974 | operator++(int) noexcept | |
975 | { | |
976 | auto __ret = *this; | |
977 | ++(*this); | |
978 | return __ret; | |
979 | } | |
980 | ||
981 | constexpr weekday& | |
982 | operator--() noexcept | |
983 | { | |
984 | *this -= days{1}; | |
985 | return *this; | |
986 | } | |
987 | ||
988 | constexpr weekday | |
989 | operator--(int) noexcept | |
990 | { | |
991 | auto __ret = *this; | |
992 | --(*this); | |
993 | return __ret; | |
994 | } | |
995 | ||
996 | constexpr weekday& | |
997 | operator+=(const days& __d) noexcept | |
998 | { | |
999 | *this = *this + __d; | |
1000 | return *this; | |
1001 | } | |
1002 | ||
1003 | constexpr weekday& | |
1004 | operator-=(const days& __d) noexcept | |
1005 | { | |
1006 | *this = *this - __d; | |
1007 | return *this; | |
1008 | } | |
1009 | ||
1010 | constexpr unsigned | |
1011 | c_encoding() const noexcept | |
1012 | { return _M_wd; } | |
1013 | ||
1014 | constexpr unsigned | |
1015 | iso_encoding() const noexcept | |
1016 | { return _M_wd == 0u ? 7u : _M_wd; } | |
1017 | ||
1018 | constexpr bool | |
1019 | ok() const noexcept | |
1020 | { return _M_wd <= 6; } | |
1021 | ||
1022 | constexpr weekday_indexed | |
1023 | operator[](unsigned __index) const noexcept; | |
1024 | ||
1025 | constexpr weekday_last | |
1026 | operator[](last_spec) const noexcept; | |
1027 | ||
1028 | friend constexpr bool | |
1029 | operator==(const weekday& __x, const weekday& __y) noexcept | |
1030 | { return __x._M_wd == __y._M_wd; } | |
1031 | ||
1032 | friend constexpr weekday | |
1033 | operator+(const weekday& __x, const days& __y) noexcept | |
1034 | { | |
1035 | auto __n = static_cast<long long>(__x._M_wd) + __y.count(); | |
1036 | return weekday{__detail::__modulo(__n, 7)}; | |
1037 | } | |
1038 | ||
1039 | friend constexpr weekday | |
1040 | operator+(const days& __x, const weekday& __y) noexcept | |
1041 | { return __y + __x; } | |
1042 | ||
1043 | friend constexpr weekday | |
1044 | operator-(const weekday& __x, const days& __y) noexcept | |
1045 | { return __x + -__y; } | |
1046 | ||
1047 | friend constexpr days | |
1048 | operator-(const weekday& __x, const weekday& __y) noexcept | |
1049 | { | |
1050 | const auto __n = __x.c_encoding() - __y.c_encoding(); | |
1051 | return static_cast<int>(__n) >= 0 ? days{__n} : days{__n + 7}; | |
1052 | } | |
1053 | }; | |
1054 | ||
1055 | inline constexpr weekday Sunday{0}; | |
1056 | inline constexpr weekday Monday{1}; | |
1057 | inline constexpr weekday Tuesday{2}; | |
1058 | inline constexpr weekday Wednesday{3}; | |
1059 | inline constexpr weekday Thursday{4}; | |
1060 | inline constexpr weekday Friday{5}; | |
1061 | inline constexpr weekday Saturday{6}; | |
1062 | ||
1063 | // WEEKDAY_INDEXED | |
1064 | ||
1065 | class weekday_indexed | |
1066 | { | |
1067 | private: | |
1068 | chrono::weekday _M_wd; | |
1069 | unsigned char _M_index; | |
1070 | ||
1071 | public: | |
1072 | weekday_indexed() = default; | |
1073 | ||
1074 | constexpr | |
1075 | weekday_indexed(const chrono::weekday& __wd, unsigned __index) noexcept | |
1076 | : _M_wd(__wd), _M_index(__index) | |
1077 | { } | |
1078 | ||
1079 | constexpr chrono::weekday | |
1080 | weekday() const noexcept | |
1081 | { return _M_wd; } | |
1082 | ||
1083 | constexpr unsigned | |
1084 | index() const noexcept | |
1085 | { return _M_index; }; | |
1086 | ||
1087 | constexpr bool | |
1088 | ok() const noexcept | |
1089 | { return _M_wd.ok() && 1 <= _M_index && _M_index <= 5; } | |
1090 | ||
1091 | friend constexpr bool | |
1092 | operator==(const weekday_indexed& __x, const weekday_indexed& __y) noexcept | |
1093 | { return __x.weekday() == __y.weekday() && __x.index() == __y.index(); } | |
1094 | ||
1095 | friend constexpr month_weekday | |
1096 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; | |
1097 | ||
1098 | friend constexpr month_weekday | |
1099 | operator/(int __m, const weekday_indexed& __wdi) noexcept; | |
1100 | ||
1101 | friend constexpr month_weekday | |
1102 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; | |
1103 | ||
1104 | friend constexpr month_weekday | |
1105 | operator/(const weekday_indexed& __wdi, int __m) noexcept; | |
1106 | ||
1107 | friend constexpr year_month_weekday | |
1108 | operator/(const year_month& __ym, const weekday_indexed& __wdi) noexcept; | |
1109 | }; | |
1110 | ||
1111 | constexpr weekday_indexed | |
1112 | weekday::operator[](unsigned __index) const noexcept | |
1113 | { return {*this, __index}; } | |
1114 | ||
1115 | // WEEKDAY_LAST | |
1116 | ||
1117 | class weekday_last | |
1118 | { | |
1119 | private: | |
1120 | chrono::weekday _M_wd; | |
1121 | ||
1122 | public: | |
1123 | explicit constexpr | |
1124 | weekday_last(const chrono::weekday& __wd) noexcept | |
1125 | : _M_wd{__wd} | |
1126 | { } | |
1127 | ||
1128 | constexpr chrono::weekday | |
1129 | weekday() const noexcept | |
1130 | { return _M_wd; } | |
1131 | ||
1132 | constexpr bool | |
1133 | ok() const noexcept | |
1134 | { return _M_wd.ok(); } | |
1135 | ||
1136 | friend constexpr bool | |
1137 | operator==(const weekday_last& __x, const weekday_last& __y) noexcept | |
1138 | { return __x.weekday() == __y.weekday(); } | |
1139 | ||
1140 | friend constexpr month_weekday_last | |
1141 | operator/(int __m, const weekday_last& __wdl) noexcept; | |
1142 | ||
1143 | friend constexpr month_weekday_last | |
1144 | operator/(const weekday_last& __wdl, int __m) noexcept; | |
1145 | ||
1146 | friend constexpr year_month_weekday_last | |
1147 | operator/(const year_month& __ym, const weekday_last& __wdl) noexcept; | |
1148 | }; | |
1149 | ||
1150 | constexpr weekday_last | |
1151 | weekday::operator[](last_spec) const noexcept | |
1152 | { return weekday_last{*this}; } | |
1153 | ||
1154 | // MONTH_DAY | |
1155 | ||
1156 | class month_day | |
1157 | { | |
1158 | private: | |
1159 | chrono::month _M_m; | |
1160 | chrono::day _M_d; | |
1161 | ||
1162 | public: | |
1163 | month_day() = default; | |
1164 | ||
1165 | constexpr | |
1166 | month_day(const chrono::month& __m, const chrono::day& __d) noexcept | |
1167 | : _M_m{__m}, _M_d{__d} | |
1168 | { } | |
1169 | ||
1170 | constexpr chrono::month | |
1171 | month() const noexcept | |
1172 | { return _M_m; } | |
1173 | ||
1174 | constexpr chrono::day | |
1175 | day() const noexcept | |
1176 | { return _M_d; } | |
1177 | ||
1178 | constexpr bool | |
1179 | ok() const noexcept | |
1180 | { | |
1181 | return _M_m.ok() | |
1182 | && 1u <= unsigned(_M_d) | |
1183 | && unsigned(_M_d) <= __detail::__days_per_month[unsigned(_M_m) - 1]; | |
1184 | } | |
1185 | ||
1186 | friend constexpr bool | |
1187 | operator==(const month_day& __x, const month_day& __y) noexcept | |
1188 | { return __x.month() == __y.month() && __x.day() == __y.day(); } | |
1189 | ||
1190 | friend constexpr strong_ordering | |
1191 | operator<=>(const month_day& __x, const month_day& __y) noexcept | |
1192 | = default; | |
1193 | ||
1194 | friend constexpr month_day | |
1195 | operator/(const chrono::month& __m, const chrono::day& __d) noexcept | |
1196 | { return {__m, __d}; } | |
1197 | ||
1198 | friend constexpr month_day | |
1199 | operator/(const chrono::month& __m, int __d) noexcept | |
1200 | { return {__m, chrono::day(unsigned(__d))}; } | |
1201 | ||
1202 | friend constexpr month_day | |
1203 | operator/(int __m, const chrono::day& __d) noexcept | |
1204 | { return {chrono::month(unsigned(__m)), __d}; } | |
1205 | ||
1206 | friend constexpr month_day | |
1207 | operator/(const chrono::day& __d, const chrono::month& __m) noexcept | |
1208 | { return {__m, __d}; } | |
1209 | ||
1210 | friend constexpr month_day | |
1211 | operator/(const chrono::day& __d, int __m) noexcept | |
1212 | { return {chrono::month(unsigned(__m)), __d}; } | |
1213 | ||
1214 | friend constexpr year_month_day | |
1215 | operator/(int __y, const month_day& __md) noexcept; | |
1216 | ||
1217 | friend constexpr year_month_day | |
1218 | operator/(const month_day& __md, int __y) noexcept; | |
1219 | }; | |
1220 | ||
1221 | // MONTH_DAY_LAST | |
1222 | ||
1223 | class month_day_last | |
1224 | { | |
1225 | private: | |
1226 | chrono::month _M_m; | |
1227 | ||
1228 | public: | |
1229 | explicit constexpr | |
1230 | month_day_last(const chrono::month& __m) noexcept | |
1231 | : _M_m{__m} | |
1232 | { } | |
1233 | ||
1234 | constexpr chrono::month | |
1235 | month() const noexcept | |
1236 | { return _M_m; } | |
1237 | ||
1238 | constexpr bool | |
1239 | ok() const noexcept | |
1240 | { return _M_m.ok(); } | |
1241 | ||
1242 | friend constexpr bool | |
1243 | operator==(const month_day_last& __x, const month_day_last& __y) noexcept | |
1244 | { return __x.month() == __y.month(); } | |
1245 | ||
1246 | friend constexpr strong_ordering | |
1247 | operator<=>(const month_day_last& __x, const month_day_last& __y) noexcept | |
1248 | = default; | |
1249 | ||
1250 | friend constexpr month_day_last | |
1251 | operator/(const chrono::month& __m, last_spec) noexcept | |
1252 | { return month_day_last{__m}; } | |
1253 | ||
1254 | friend constexpr month_day_last | |
1255 | operator/(int __m, last_spec) noexcept | |
1256 | { return chrono::month(unsigned(__m)) / last; } | |
1257 | ||
1258 | friend constexpr month_day_last | |
1259 | operator/(last_spec, const chrono::month& __m) noexcept | |
1260 | { return __m / last; } | |
1261 | ||
1262 | friend constexpr month_day_last | |
1263 | operator/(last_spec, int __m) noexcept | |
1264 | { return __m / last; } | |
1265 | ||
1266 | friend constexpr year_month_day_last | |
1267 | operator/(int __y, const month_day_last& __mdl) noexcept; | |
1268 | ||
1269 | friend constexpr year_month_day_last | |
1270 | operator/(const month_day_last& __mdl, int __y) noexcept; | |
1271 | }; | |
1272 | ||
1273 | // MONTH_WEEKDAY | |
1274 | ||
1275 | class month_weekday | |
1276 | { | |
1277 | private: | |
1278 | chrono::month _M_m; | |
1279 | chrono::weekday_indexed _M_wdi; | |
1280 | ||
1281 | public: | |
1282 | constexpr | |
1283 | month_weekday(const chrono::month& __m, | |
1284 | const chrono::weekday_indexed& __wdi) noexcept | |
1285 | : _M_m{__m}, _M_wdi{__wdi} | |
1286 | { } | |
1287 | ||
1288 | constexpr chrono::month | |
1289 | month() const noexcept | |
1290 | { return _M_m; } | |
1291 | ||
1292 | constexpr chrono::weekday_indexed | |
1293 | weekday_indexed() const noexcept | |
1294 | { return _M_wdi; } | |
1295 | ||
1296 | constexpr bool | |
1297 | ok() const noexcept | |
1298 | { return _M_m.ok() && _M_wdi.ok(); } | |
1299 | ||
1300 | friend constexpr bool | |
1301 | operator==(const month_weekday& __x, const month_weekday& __y) noexcept | |
1302 | { | |
1303 | return __x.month() == __y.month() | |
1304 | && __x.weekday_indexed() == __y.weekday_indexed(); | |
1305 | } | |
1306 | ||
1307 | friend constexpr month_weekday | |
1308 | operator/(const chrono::month& __m, | |
1309 | const chrono::weekday_indexed& __wdi) noexcept | |
1310 | { return {__m, __wdi}; } | |
1311 | ||
1312 | friend constexpr month_weekday | |
1313 | operator/(int __m, const chrono::weekday_indexed& __wdi) noexcept | |
1314 | { return chrono::month(unsigned(__m)) / __wdi; } | |
1315 | ||
1316 | friend constexpr month_weekday | |
1317 | operator/(const chrono::weekday_indexed& __wdi, | |
1318 | const chrono::month& __m) noexcept | |
1319 | { return __m / __wdi; } | |
1320 | ||
1321 | friend constexpr month_weekday | |
1322 | operator/(const chrono::weekday_indexed& __wdi, int __m) noexcept | |
1323 | { return __m / __wdi; } | |
1324 | ||
1325 | friend constexpr year_month_weekday | |
1326 | operator/(int __y, const month_weekday& __mwd) noexcept; | |
1327 | ||
1328 | friend constexpr year_month_weekday | |
1329 | operator/(const month_weekday& __mwd, int __y) noexcept; | |
1330 | }; | |
1331 | ||
1332 | // MONTH_WEEKDAY_LAST | |
1333 | ||
1334 | class month_weekday_last | |
1335 | { | |
1336 | private: | |
1337 | chrono::month _M_m; | |
1338 | chrono::weekday_last _M_wdl; | |
1339 | ||
1340 | public: | |
1341 | constexpr | |
1342 | month_weekday_last(const chrono::month& __m, | |
1343 | const chrono::weekday_last& __wdl) noexcept | |
1344 | :_M_m{__m}, _M_wdl{__wdl} | |
1345 | { } | |
1346 | ||
1347 | constexpr chrono::month | |
1348 | month() const noexcept | |
1349 | { return _M_m; } | |
1350 | ||
1351 | constexpr chrono::weekday_last | |
1352 | weekday_last() const noexcept | |
1353 | { return _M_wdl; } | |
1354 | ||
1355 | constexpr bool | |
1356 | ok() const noexcept | |
1357 | { return _M_m.ok() && _M_wdl.ok(); } | |
1358 | ||
1359 | friend constexpr bool | |
1360 | operator==(const month_weekday_last& __x, | |
1361 | const month_weekday_last& __y) noexcept | |
1362 | { | |
1363 | return __x.month() == __y.month() | |
1364 | && __x.weekday_last() == __y.weekday_last(); | |
1365 | } | |
1366 | ||
1367 | friend constexpr month_weekday_last | |
1368 | operator/(const chrono::month& __m, | |
1369 | const chrono::weekday_last& __wdl) noexcept | |
1370 | { return {__m, __wdl}; } | |
1371 | ||
1372 | friend constexpr month_weekday_last | |
1373 | operator/(int __m, const chrono::weekday_last& __wdl) noexcept | |
1374 | { return chrono::month(unsigned(__m)) / __wdl; } | |
1375 | ||
1376 | friend constexpr month_weekday_last | |
1377 | operator/(const chrono::weekday_last& __wdl, | |
1378 | const chrono::month& __m) noexcept | |
1379 | { return __m / __wdl; } | |
1380 | ||
1381 | friend constexpr month_weekday_last | |
1382 | operator/(const chrono::weekday_last& __wdl, int __m) noexcept | |
1383 | { return chrono::month(unsigned(__m)) / __wdl; } | |
1384 | ||
1385 | friend constexpr year_month_weekday_last | |
1386 | operator/(int __y, const month_weekday_last& __mwdl) noexcept; | |
1387 | ||
1388 | friend constexpr year_month_weekday_last | |
1389 | operator/(const month_weekday_last& __mwdl, int __y) noexcept; | |
1390 | }; | |
1391 | ||
1392 | // YEAR_MONTH | |
1393 | ||
1394 | namespace __detail | |
1395 | { | |
1396 | // [time.cal.ym], [time.cal.ymd], etc constrain the 'months'-based | |
1397 | // addition/subtraction operator overloads like so: | |
1398 | // | |
1399 | // Constraints: if the argument supplied by the caller for the months | |
1400 | // parameter is convertible to years, its implicit conversion sequence | |
1401 | // to years is worse than its implicit conversion sequence to months. | |
1402 | // | |
1403 | // We realize this constraint by templatizing the 'months'-based | |
1404 | // overloads (using a dummy defaulted template parameter), so that | |
1405 | // overload resolution doesn't select the 'months'-based overload unless | |
1406 | // the implicit conversion sequence to 'months' is better than that to | |
1407 | // 'years'. | |
1408 | using __months_years_conversion_disambiguator = void; | |
1409 | } | |
1410 | ||
1411 | class year_month | |
1412 | { | |
1413 | private: | |
1414 | chrono::year _M_y; | |
1415 | chrono::month _M_m; | |
1416 | ||
1417 | public: | |
1418 | year_month() = default; | |
1419 | ||
1420 | constexpr | |
1421 | year_month(const chrono::year& __y, const chrono::month& __m) noexcept | |
1422 | : _M_y{__y}, _M_m{__m} | |
1423 | { } | |
1424 | ||
1425 | constexpr chrono::year | |
1426 | year() const noexcept | |
1427 | { return _M_y; } | |
1428 | ||
1429 | constexpr chrono::month | |
1430 | month() const noexcept | |
1431 | { return _M_m; } | |
1432 | ||
1433 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1434 | constexpr year_month& | |
1435 | operator+=(const months& __dm) noexcept | |
1436 | { | |
1437 | *this = *this + __dm; | |
1438 | return *this; | |
1439 | } | |
1440 | ||
1441 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1442 | constexpr year_month& | |
1443 | operator-=(const months& __dm) noexcept | |
1444 | { | |
1445 | *this = *this - __dm; | |
1446 | return *this; | |
1447 | } | |
1448 | ||
1449 | constexpr year_month& | |
1450 | operator+=(const years& __dy) noexcept | |
1451 | { | |
1452 | *this = *this + __dy; | |
1453 | return *this; | |
1454 | } | |
1455 | ||
1456 | constexpr year_month& | |
1457 | operator-=(const years& __dy) noexcept | |
1458 | { | |
1459 | *this = *this - __dy; | |
1460 | return *this; | |
1461 | } | |
1462 | ||
1463 | constexpr bool | |
1464 | ok() const noexcept | |
1465 | { return _M_y.ok() && _M_m.ok(); } | |
1466 | ||
1467 | friend constexpr bool | |
1468 | operator==(const year_month& __x, const year_month& __y) noexcept | |
1469 | { return __x.year() == __y.year() && __x.month() == __y.month(); } | |
1470 | ||
1471 | friend constexpr strong_ordering | |
1472 | operator<=>(const year_month& __x, const year_month& __y) noexcept | |
1473 | = default; | |
1474 | ||
1475 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1476 | friend constexpr year_month | |
1477 | operator+(const year_month& __ym, const months& __dm) noexcept | |
1478 | { | |
1479 | // TODO: Optimize? | |
1480 | auto __m = __ym.month() + __dm; | |
1481 | auto __i = int(unsigned(__ym.month())) - 1 + __dm.count(); | |
1482 | auto __y = (__i < 0 | |
1483 | ? __ym.year() + years{(__i - 11) / 12} | |
1484 | : __ym.year() + years{__i / 12}); | |
1485 | return __y / __m; | |
1486 | } | |
1487 | ||
1488 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1489 | friend constexpr year_month | |
1490 | operator+(const months& __dm, const year_month& __ym) noexcept | |
1491 | { return __ym + __dm; } | |
1492 | ||
1493 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1494 | friend constexpr year_month | |
1495 | operator-(const year_month& __ym, const months& __dm) noexcept | |
1496 | { return __ym + -__dm; } | |
1497 | ||
1498 | friend constexpr months | |
1499 | operator-(const year_month& __x, const year_month& __y) noexcept | |
1500 | { | |
1501 | return (__x.year() - __y.year() | |
1502 | + months{static_cast<int>(unsigned{__x.month()}) | |
1503 | - static_cast<int>(unsigned{__y.month()})}); | |
1504 | } | |
1505 | ||
1506 | friend constexpr year_month | |
1507 | operator+(const year_month& __ym, const years& __dy) noexcept | |
1508 | { return (__ym.year() + __dy) / __ym.month(); } | |
1509 | ||
1510 | friend constexpr year_month | |
1511 | operator+(const years& __dy, const year_month& __ym) noexcept | |
1512 | { return __ym + __dy; } | |
1513 | ||
1514 | friend constexpr year_month | |
1515 | operator-(const year_month& __ym, const years& __dy) noexcept | |
1516 | { return __ym + -__dy; } | |
1517 | ||
1518 | friend constexpr year_month | |
1519 | operator/(const chrono::year& __y, const chrono::month& __m) noexcept | |
1520 | { return {__y, __m}; } | |
1521 | ||
1522 | friend constexpr year_month | |
1523 | operator/(const chrono::year& __y, int __m) noexcept | |
1524 | { return {__y, chrono::month(unsigned(__m))}; } | |
1525 | ||
1526 | friend constexpr year_month_day | |
1527 | operator/(const year_month& __ym, int __d) noexcept; | |
1528 | ||
1529 | friend constexpr year_month_day_last | |
1530 | operator/(const year_month& __ym, last_spec) noexcept; | |
1531 | }; | |
1532 | ||
1533 | // YEAR_MONTH_DAY | |
1534 | ||
1535 | class year_month_day | |
1536 | { | |
1537 | private: | |
1538 | chrono::year _M_y; | |
1539 | chrono::month _M_m; | |
1540 | chrono::day _M_d; | |
1541 | ||
1542 | static constexpr year_month_day _S_from_days(const days& __dp) noexcept; | |
1543 | ||
1544 | constexpr days _M_days_since_epoch() const noexcept; | |
1545 | ||
1546 | public: | |
1547 | year_month_day() = default; | |
1548 | ||
1549 | constexpr | |
1550 | year_month_day(const chrono::year& __y, const chrono::month& __m, | |
1551 | const chrono::day& __d) noexcept | |
1552 | : _M_y{__y}, _M_m{__m}, _M_d{__d} | |
1553 | { } | |
1554 | ||
1555 | constexpr | |
1556 | year_month_day(const year_month_day_last& __ymdl) noexcept; | |
1557 | ||
1558 | constexpr | |
1559 | year_month_day(const sys_days& __dp) noexcept | |
1560 | : year_month_day(_S_from_days(__dp.time_since_epoch())) | |
1561 | { } | |
1562 | ||
1563 | explicit constexpr | |
1564 | year_month_day(const local_days& __dp) noexcept | |
1565 | : year_month_day(sys_days{__dp.time_since_epoch()}) | |
1566 | { } | |
1567 | ||
1568 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1569 | constexpr year_month_day& | |
1570 | operator+=(const months& __m) noexcept | |
1571 | { | |
1572 | *this = *this + __m; | |
1573 | return *this; | |
1574 | } | |
1575 | ||
1576 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1577 | constexpr year_month_day& | |
1578 | operator-=(const months& __m) noexcept | |
1579 | { | |
1580 | *this = *this - __m; | |
1581 | return *this; | |
1582 | } | |
1583 | ||
1584 | constexpr year_month_day& | |
1585 | operator+=(const years& __y) noexcept | |
1586 | { | |
1587 | *this = *this + __y; | |
1588 | return *this; | |
1589 | } | |
1590 | ||
1591 | constexpr year_month_day& | |
1592 | operator-=(const years& __y) noexcept | |
1593 | { | |
1594 | *this = *this - __y; | |
1595 | return *this; | |
1596 | } | |
1597 | ||
1598 | constexpr chrono::year | |
1599 | year() const noexcept | |
1600 | { return _M_y; } | |
1601 | ||
1602 | constexpr chrono::month | |
1603 | month() const noexcept | |
1604 | { return _M_m; } | |
1605 | ||
1606 | constexpr chrono::day | |
1607 | day() const noexcept | |
1608 | { return _M_d; } | |
1609 | ||
1610 | constexpr | |
1611 | operator sys_days() const noexcept | |
1612 | { return sys_days{_M_days_since_epoch()}; } | |
1613 | ||
1614 | explicit constexpr | |
1615 | operator local_days() const noexcept | |
1616 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
1617 | ||
1618 | constexpr bool ok() const noexcept; | |
1619 | ||
1620 | friend constexpr bool | |
1621 | operator==(const year_month_day& __x, const year_month_day& __y) noexcept | |
1622 | { | |
1623 | return __x.year() == __y.year() | |
1624 | && __x.month() == __y.month() | |
1625 | && __x.day() == __y.day(); | |
1626 | } | |
1627 | ||
1628 | friend constexpr strong_ordering | |
1629 | operator<=>(const year_month_day& __x, const year_month_day& __y) noexcept | |
1630 | = default; | |
1631 | ||
1632 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1633 | friend constexpr year_month_day | |
1634 | operator+(const year_month_day& __ymd, const months& __dm) noexcept | |
1635 | { return (__ymd.year() / __ymd.month() + __dm) / __ymd.day(); } | |
1636 | ||
1637 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1638 | friend constexpr year_month_day | |
1639 | operator+(const months& __dm, const year_month_day& __ymd) noexcept | |
1640 | { return __ymd + __dm; } | |
1641 | ||
1642 | friend constexpr year_month_day | |
1643 | operator+(const year_month_day& __ymd, const years& __dy) noexcept | |
1644 | { return (__ymd.year() + __dy) / __ymd.month() / __ymd.day(); } | |
1645 | ||
1646 | friend constexpr year_month_day | |
1647 | operator+(const years& __dy, const year_month_day& __ymd) noexcept | |
1648 | { return __ymd + __dy; } | |
1649 | ||
1650 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1651 | friend constexpr year_month_day | |
1652 | operator-(const year_month_day& __ymd, const months& __dm) noexcept | |
1653 | { return __ymd + -__dm; } | |
1654 | ||
1655 | friend constexpr year_month_day | |
1656 | operator-(const year_month_day& __ymd, const years& __dy) noexcept | |
1657 | { return __ymd + -__dy; } | |
1658 | ||
1659 | friend constexpr year_month_day | |
1660 | operator/(const year_month& __ym, const chrono::day& __d) noexcept | |
1661 | { return {__ym.year(), __ym.month(), __d}; } | |
1662 | ||
1663 | friend constexpr year_month_day | |
1664 | operator/(const year_month& __ym, int __d) noexcept | |
1665 | { return __ym / chrono::day{unsigned(__d)}; } | |
1666 | ||
1667 | friend constexpr year_month_day | |
1668 | operator/(const chrono::year& __y, const month_day& __md) noexcept | |
1669 | { return __y / __md.month() / __md.day(); } | |
1670 | ||
1671 | friend constexpr year_month_day | |
1672 | operator/(int __y, const month_day& __md) noexcept | |
1673 | { return chrono::year{__y} / __md; } | |
1674 | ||
1675 | friend constexpr year_month_day | |
1676 | operator/(const month_day& __md, const chrono::year& __y) noexcept | |
1677 | { return __y / __md; } | |
1678 | ||
1679 | friend constexpr year_month_day | |
1680 | operator/(const month_day& __md, int __y) noexcept | |
1681 | { return chrono::year(__y) / __md; } | |
1682 | }; | |
1683 | ||
1684 | // Construct from days since 1970/01/01. | |
1685 | // Proposition 6.3 of Neri and Schneider, | |
1686 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". | |
1687 | // https://arxiv.org/abs/2102.06959 | |
1688 | constexpr year_month_day | |
1689 | year_month_day::_S_from_days(const days& __dp) noexcept | |
1690 | { | |
1691 | constexpr auto __z2 = static_cast<uint32_t>(-1468000); | |
1692 | constexpr auto __r2_e3 = static_cast<uint32_t>(536895458); | |
1693 | ||
1694 | const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3; | |
1695 | ||
1696 | const auto __n1 = 4 * __r0 + 3; | |
1697 | const auto __q1 = __n1 / 146097; | |
1698 | const auto __r1 = __n1 % 146097 / 4; | |
1699 | ||
1700 | constexpr auto __p32 = static_cast<uint64_t>(1) << 32; | |
1701 | const auto __n2 = 4 * __r1 + 3; | |
1702 | const auto __u2 = static_cast<uint64_t>(2939745) * __n2; | |
1703 | const auto __q2 = static_cast<uint32_t>(__u2 / __p32); | |
1704 | const auto __r2 = static_cast<uint32_t>(__u2 % __p32) / 2939745 / 4; | |
1705 | ||
1706 | constexpr auto __p16 = static_cast<uint32_t>(1) << 16; | |
1707 | const auto __n3 = 2141 * __r2 + 197913; | |
1708 | const auto __q3 = __n3 / __p16; | |
1709 | const auto __r3 = __n3 % __p16 / 2141; | |
1710 | ||
1711 | const auto __y0 = 100 * __q1 + __q2; | |
1712 | const auto __m0 = __q3; | |
1713 | const auto __d0 = __r3; | |
1714 | ||
1715 | const auto __j = __r2 >= 306; | |
1716 | const auto __y1 = __y0 + __j; | |
1717 | const auto __m1 = __j ? __m0 - 12 : __m0; | |
1718 | const auto __d1 = __d0 + 1; | |
1719 | ||
1720 | return year_month_day{chrono::year{static_cast<int>(__y1 + __z2)}, | |
1721 | chrono::month{__m1}, chrono::day{__d1}}; | |
1722 | } | |
1723 | ||
1724 | // Days since 1970/01/01. | |
1725 | // Proposition 6.2 of Neri and Schneider, | |
1726 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". | |
1727 | // https://arxiv.org/abs/2102.06959 | |
1728 | constexpr days | |
1729 | year_month_day::_M_days_since_epoch() const noexcept | |
1730 | { | |
1731 | auto constexpr __z2 = static_cast<uint32_t>(-1468000); | |
1732 | auto constexpr __r2_e3 = static_cast<uint32_t>(536895458); | |
1733 | ||
1734 | const auto __y1 = static_cast<uint32_t>(static_cast<int>(_M_y)) - __z2; | |
1735 | const auto __m1 = static_cast<uint32_t>(static_cast<unsigned>(_M_m)); | |
1736 | const auto __d1 = static_cast<uint32_t>(static_cast<unsigned>(_M_d)); | |
1737 | ||
1738 | const auto __j = static_cast<uint32_t>(__m1 < 3); | |
1739 | const auto __y0 = __y1 - __j; | |
1740 | const auto __m0 = __j ? __m1 + 12 : __m1; | |
1741 | const auto __d0 = __d1 - 1; | |
1742 | ||
1743 | const auto __q1 = __y0 / 100; | |
1744 | const auto __yc = 1461 * __y0 / 4 - __q1 + __q1 / 4; | |
1745 | const auto __mc = (979 *__m0 - 2919) / 32; | |
1746 | const auto __dc = __d0; | |
1747 | ||
1748 | return days{static_cast<int32_t>(__yc + __mc + __dc - __r2_e3)}; | |
1749 | } | |
1750 | ||
1751 | // YEAR_MONTH_DAY_LAST | |
1752 | ||
1753 | class year_month_day_last | |
1754 | { | |
1755 | private: | |
1756 | chrono::year _M_y; | |
1757 | chrono::month_day_last _M_mdl; | |
1758 | ||
1759 | public: | |
1760 | constexpr | |
1761 | year_month_day_last(const chrono::year& __y, | |
1762 | const chrono::month_day_last& __mdl) noexcept | |
1763 | : _M_y{__y}, _M_mdl{__mdl} | |
1764 | { } | |
1765 | ||
1766 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1767 | constexpr year_month_day_last& | |
1768 | operator+=(const months& __m) noexcept | |
1769 | { | |
1770 | *this = *this + __m; | |
1771 | return *this; | |
1772 | } | |
1773 | ||
1774 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1775 | constexpr year_month_day_last& | |
1776 | operator-=(const months& __m) noexcept | |
1777 | { | |
1778 | *this = *this - __m; | |
1779 | return *this; | |
1780 | } | |
1781 | ||
1782 | constexpr year_month_day_last& | |
1783 | operator+=(const years& __y) noexcept | |
1784 | { | |
1785 | *this = *this + __y; | |
1786 | return *this; | |
1787 | } | |
1788 | ||
1789 | constexpr year_month_day_last& | |
1790 | operator-=(const years& __y) noexcept | |
1791 | { | |
1792 | *this = *this - __y; | |
1793 | return *this; | |
1794 | } | |
1795 | ||
1796 | constexpr chrono::year | |
1797 | year() const noexcept | |
1798 | { return _M_y; } | |
1799 | ||
1800 | constexpr chrono::month | |
1801 | month() const noexcept | |
1802 | { return _M_mdl.month(); } | |
1803 | ||
1804 | constexpr chrono::month_day_last | |
1805 | month_day_last() const noexcept | |
1806 | { return _M_mdl; } | |
1807 | ||
1808 | // Return A day representing the last day of this year, month pair. | |
1809 | constexpr chrono::day | |
1810 | day() const noexcept | |
1811 | { | |
1812 | const auto __m = static_cast<unsigned>(month()); | |
1813 | ||
1814 | // The result is unspecified if __m < 1 or __m > 12. Hence, assume | |
1815 | // 1 <= __m <= 12. For __m != 2, day() == 30 or day() == 31 or, in | |
1816 | // other words, day () == 30 | b, where b is in {0, 1}. | |
1817 | ||
1818 | // If __m in {1, 3, 4, 5, 6, 7}, then b is 1 if, and only if, __m is | |
1819 | // odd. Hence, b = __m & 1 = (__m ^ 0) & 1. | |
1820 | ||
1821 | // If __m in {8, 9, 10, 11, 12}, then b is 1 if, and only if, __m is | |
1822 | // even. Hence, b = (__m ^ 1) & 1. | |
1823 | ||
1824 | // Therefore, b = (__m ^ c) & 1, where c = 0, if __m < 8, or c = 1 if | |
1825 | // __m >= 8, that is, c = __m >> 3. | |
1826 | ||
1827 | // Since 30 = (11110)_2 and __m <= 31 = (11111)_2, the "& 1" in b's | |
1828 | // calculation is unnecessary. | |
1829 | ||
1830 | // The performance of this implementation does not depend on look-up | |
1831 | // tables being on the L1 cache. | |
1832 | return chrono::day{__m != 2 ? (__m ^ (__m >> 3)) | 30 | |
1833 | : _M_y.is_leap() ? 29 : 28}; | |
1834 | } | |
1835 | ||
1836 | constexpr | |
1837 | operator sys_days() const noexcept | |
1838 | { return sys_days{year() / month() / day()}; } | |
1839 | ||
1840 | explicit constexpr | |
1841 | operator local_days() const noexcept | |
1842 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
1843 | ||
1844 | constexpr bool | |
1845 | ok() const noexcept | |
1846 | { return _M_y.ok() && _M_mdl.ok(); } | |
1847 | ||
1848 | friend constexpr bool | |
1849 | operator==(const year_month_day_last& __x, | |
1850 | const year_month_day_last& __y) noexcept | |
1851 | { | |
1852 | return __x.year() == __y.year() | |
1853 | && __x.month_day_last() == __y.month_day_last(); | |
1854 | } | |
1855 | ||
1856 | friend constexpr strong_ordering | |
1857 | operator<=>(const year_month_day_last& __x, | |
1858 | const year_month_day_last& __y) noexcept | |
1859 | = default; | |
1860 | ||
1861 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1862 | friend constexpr year_month_day_last | |
1863 | operator+(const year_month_day_last& __ymdl, | |
1864 | const months& __dm) noexcept | |
1865 | { return (__ymdl.year() / __ymdl.month() + __dm) / last; } | |
1866 | ||
1867 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1868 | friend constexpr year_month_day_last | |
1869 | operator+(const months& __dm, | |
1870 | const year_month_day_last& __ymdl) noexcept | |
1871 | { return __ymdl + __dm; } | |
1872 | ||
1873 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1874 | friend constexpr year_month_day_last | |
1875 | operator-(const year_month_day_last& __ymdl, | |
1876 | const months& __dm) noexcept | |
1877 | { return __ymdl + -__dm; } | |
1878 | ||
1879 | friend constexpr year_month_day_last | |
1880 | operator+(const year_month_day_last& __ymdl, | |
1881 | const years& __dy) noexcept | |
1882 | { return {__ymdl.year() + __dy, __ymdl.month_day_last()}; } | |
1883 | ||
1884 | friend constexpr year_month_day_last | |
1885 | operator+(const years& __dy, | |
1886 | const year_month_day_last& __ymdl) noexcept | |
1887 | { return __ymdl + __dy; } | |
1888 | ||
1889 | friend constexpr year_month_day_last | |
1890 | operator-(const year_month_day_last& __ymdl, | |
1891 | const years& __dy) noexcept | |
1892 | { return __ymdl + -__dy; } | |
1893 | ||
1894 | friend constexpr year_month_day_last | |
1895 | operator/(const year_month& __ym, last_spec) noexcept | |
1896 | { return {__ym.year(), chrono::month_day_last{__ym.month()}}; } | |
1897 | ||
1898 | friend constexpr year_month_day_last | |
1899 | operator/(const chrono::year& __y, | |
1900 | const chrono::month_day_last& __mdl) noexcept | |
1901 | { return {__y, __mdl}; } | |
1902 | ||
1903 | friend constexpr year_month_day_last | |
1904 | operator/(int __y, const chrono::month_day_last& __mdl) noexcept | |
1905 | { return chrono::year(__y) / __mdl; } | |
1906 | ||
1907 | friend constexpr year_month_day_last | |
1908 | operator/(const chrono::month_day_last& __mdl, | |
1909 | const chrono::year& __y) noexcept | |
1910 | { return __y / __mdl; } | |
1911 | ||
1912 | friend constexpr year_month_day_last | |
1913 | operator/(const chrono::month_day_last& __mdl, int __y) noexcept | |
1914 | { return chrono::year(__y) / __mdl; } | |
1915 | }; | |
1916 | ||
1917 | // year_month_day ctor from year_month_day_last | |
1918 | constexpr | |
1919 | year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept | |
1920 | : _M_y{__ymdl.year()}, _M_m{__ymdl.month()}, _M_d{__ymdl.day()} | |
1921 | { } | |
1922 | ||
1923 | constexpr bool | |
1924 | year_month_day::ok() const noexcept | |
1925 | { | |
1926 | if (!_M_y.ok() || !_M_m.ok()) | |
1927 | return false; | |
1928 | return chrono::day{1} <= _M_d && _M_d <= (_M_y / _M_m / last).day(); | |
1929 | } | |
1930 | ||
1931 | // YEAR_MONTH_WEEKDAY | |
1932 | ||
1933 | class year_month_weekday | |
1934 | { | |
1935 | private: | |
1936 | chrono::year _M_y; | |
1937 | chrono::month _M_m; | |
1938 | chrono::weekday_indexed _M_wdi; | |
1939 | ||
1940 | static constexpr year_month_weekday | |
1941 | _S_from_sys_days(const sys_days& __dp) | |
1942 | { | |
1943 | year_month_day __ymd{__dp}; | |
1944 | chrono::weekday __wd{__dp}; | |
1945 | auto __index = __wd[(unsigned{__ymd.day()} - 1) / 7 + 1]; | |
1946 | return {__ymd.year(), __ymd.month(), __index}; | |
1947 | } | |
1948 | ||
1949 | public: | |
1950 | year_month_weekday() = default; | |
1951 | ||
1952 | constexpr | |
1953 | year_month_weekday(const chrono::year& __y, const chrono::month& __m, | |
1954 | const chrono::weekday_indexed& __wdi) noexcept | |
1955 | : _M_y{__y}, _M_m{__m}, _M_wdi{__wdi} | |
1956 | { } | |
1957 | ||
1958 | constexpr | |
1959 | year_month_weekday(const sys_days& __dp) noexcept | |
1960 | : year_month_weekday{_S_from_sys_days(__dp)} | |
1961 | { } | |
1962 | ||
1963 | explicit constexpr | |
1964 | year_month_weekday(const local_days& __dp) noexcept | |
1965 | : year_month_weekday{sys_days{__dp.time_since_epoch()}} | |
1966 | { } | |
1967 | ||
1968 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1969 | constexpr year_month_weekday& | |
1970 | operator+=(const months& __m) noexcept | |
1971 | { | |
1972 | *this = *this + __m; | |
1973 | return *this; | |
1974 | } | |
1975 | ||
1976 | template<typename = __detail::__months_years_conversion_disambiguator> | |
1977 | constexpr year_month_weekday& | |
1978 | operator-=(const months& __m) noexcept | |
1979 | { | |
1980 | *this = *this - __m; | |
1981 | return *this; | |
1982 | } | |
1983 | ||
1984 | constexpr year_month_weekday& | |
1985 | operator+=(const years& __y) noexcept | |
1986 | { | |
1987 | *this = *this + __y; | |
1988 | return *this; | |
1989 | } | |
1990 | ||
1991 | constexpr year_month_weekday& | |
1992 | operator-=(const years& __y) noexcept | |
1993 | { | |
1994 | *this = *this - __y; | |
1995 | return *this; | |
1996 | } | |
1997 | ||
1998 | constexpr chrono::year | |
1999 | year() const noexcept | |
2000 | { return _M_y; } | |
2001 | ||
2002 | constexpr chrono::month | |
2003 | month() const noexcept | |
2004 | { return _M_m; } | |
2005 | ||
2006 | constexpr chrono::weekday | |
2007 | weekday() const noexcept | |
2008 | { return _M_wdi.weekday(); } | |
2009 | ||
2010 | constexpr unsigned | |
2011 | index() const noexcept | |
2012 | { return _M_wdi.index(); } | |
2013 | ||
2014 | constexpr chrono::weekday_indexed | |
2015 | weekday_indexed() const noexcept | |
2016 | { return _M_wdi; } | |
2017 | ||
2018 | constexpr | |
2019 | operator sys_days() const noexcept | |
2020 | { | |
2021 | auto __d = sys_days{year() / month() / 1}; | |
2022 | return __d + (weekday() - chrono::weekday(__d) | |
2023 | + days{(static_cast<int>(index())-1)*7}); | |
2024 | } | |
2025 | ||
2026 | explicit constexpr | |
2027 | operator local_days() const noexcept | |
2028 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
2029 | ||
2030 | constexpr bool | |
2031 | ok() const noexcept | |
2032 | { | |
2033 | if (!_M_y.ok() || !_M_m.ok() || !_M_wdi.ok()) | |
2034 | return false; | |
2035 | if (_M_wdi.index() <= 4) | |
2036 | return true; | |
2037 | days __d = (_M_wdi.weekday() | |
2038 | - chrono::weekday{sys_days{_M_y / _M_m / 1}} | |
2039 | + days((_M_wdi.index()-1)*7 + 1)); | |
2040 | __glibcxx_assert(__d.count() >= 1); | |
2041 | return (unsigned)__d.count() <= (unsigned)(_M_y / _M_m / last).day(); | |
2042 | } | |
2043 | ||
2044 | friend constexpr bool | |
2045 | operator==(const year_month_weekday& __x, | |
2046 | const year_month_weekday& __y) noexcept | |
2047 | { | |
2048 | return __x.year() == __y.year() | |
2049 | && __x.month() == __y.month() | |
2050 | && __x.weekday_indexed() == __y.weekday_indexed(); | |
2051 | } | |
2052 | ||
2053 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2054 | friend constexpr year_month_weekday | |
2055 | operator+(const year_month_weekday& __ymwd, const months& __dm) noexcept | |
2056 | { | |
2057 | return ((__ymwd.year() / __ymwd.month() + __dm) | |
2058 | / __ymwd.weekday_indexed()); | |
2059 | } | |
2060 | ||
2061 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2062 | friend constexpr year_month_weekday | |
2063 | operator+(const months& __dm, const year_month_weekday& __ymwd) noexcept | |
2064 | { return __ymwd + __dm; } | |
2065 | ||
2066 | friend constexpr year_month_weekday | |
2067 | operator+(const year_month_weekday& __ymwd, const years& __dy) noexcept | |
2068 | { return {__ymwd.year() + __dy, __ymwd.month(), __ymwd.weekday_indexed()}; } | |
2069 | ||
2070 | friend constexpr year_month_weekday | |
2071 | operator+(const years& __dy, const year_month_weekday& __ymwd) noexcept | |
2072 | { return __ymwd + __dy; } | |
2073 | ||
2074 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2075 | friend constexpr year_month_weekday | |
2076 | operator-(const year_month_weekday& __ymwd, const months& __dm) noexcept | |
2077 | { return __ymwd + -__dm; } | |
2078 | ||
2079 | friend constexpr year_month_weekday | |
2080 | operator-(const year_month_weekday& __ymwd, const years& __dy) noexcept | |
2081 | { return __ymwd + -__dy; } | |
2082 | ||
2083 | friend constexpr year_month_weekday | |
2084 | operator/(const year_month& __ym, | |
2085 | const chrono::weekday_indexed& __wdi) noexcept | |
2086 | { return {__ym.year(), __ym.month(), __wdi}; } | |
2087 | ||
2088 | friend constexpr year_month_weekday | |
2089 | operator/(const chrono::year& __y, const month_weekday& __mwd) noexcept | |
2090 | { return {__y, __mwd.month(), __mwd.weekday_indexed()}; } | |
2091 | ||
2092 | friend constexpr year_month_weekday | |
2093 | operator/(int __y, const month_weekday& __mwd) noexcept | |
2094 | { return chrono::year(__y) / __mwd; } | |
2095 | ||
2096 | friend constexpr year_month_weekday | |
2097 | operator/(const month_weekday& __mwd, const chrono::year& __y) noexcept | |
2098 | { return __y / __mwd; } | |
2099 | ||
2100 | friend constexpr year_month_weekday | |
2101 | operator/(const month_weekday& __mwd, int __y) noexcept | |
2102 | { return chrono::year(__y) / __mwd; } | |
2103 | }; | |
2104 | ||
2105 | // YEAR_MONTH_WEEKDAY_LAST | |
2106 | ||
2107 | class year_month_weekday_last | |
2108 | { | |
2109 | private: | |
2110 | chrono::year _M_y; | |
2111 | chrono::month _M_m; | |
2112 | chrono::weekday_last _M_wdl; | |
2113 | ||
2114 | public: | |
2115 | constexpr | |
2116 | year_month_weekday_last(const chrono::year& __y, const chrono::month& __m, | |
2117 | const chrono::weekday_last& __wdl) noexcept | |
2118 | : _M_y{__y}, _M_m{__m}, _M_wdl{__wdl} | |
2119 | { } | |
2120 | ||
2121 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2122 | constexpr year_month_weekday_last& | |
2123 | operator+=(const months& __m) noexcept | |
2124 | { | |
2125 | *this = *this + __m; | |
2126 | return *this; | |
2127 | } | |
2128 | ||
2129 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2130 | constexpr year_month_weekday_last& | |
2131 | operator-=(const months& __m) noexcept | |
2132 | { | |
2133 | *this = *this - __m; | |
2134 | return *this; | |
2135 | } | |
2136 | ||
2137 | constexpr year_month_weekday_last& | |
2138 | operator+=(const years& __y) noexcept | |
2139 | { | |
2140 | *this = *this + __y; | |
2141 | return *this; | |
2142 | } | |
2143 | ||
2144 | constexpr year_month_weekday_last& | |
2145 | operator-=(const years& __y) noexcept | |
2146 | { | |
2147 | *this = *this - __y; | |
2148 | return *this; | |
2149 | } | |
2150 | ||
2151 | constexpr chrono::year | |
2152 | year() const noexcept | |
2153 | { return _M_y; } | |
2154 | ||
2155 | constexpr chrono::month | |
2156 | month() const noexcept | |
2157 | { return _M_m; } | |
2158 | ||
2159 | constexpr chrono::weekday | |
2160 | weekday() const noexcept | |
2161 | { return _M_wdl.weekday(); } | |
2162 | ||
2163 | constexpr chrono::weekday_last | |
2164 | weekday_last() const noexcept | |
2165 | { return _M_wdl; } | |
2166 | ||
2167 | constexpr | |
2168 | operator sys_days() const noexcept | |
2169 | { | |
2170 | const auto __d = sys_days{_M_y / _M_m / last}; | |
2171 | return sys_days{(__d - (chrono::weekday{__d} | |
2172 | - _M_wdl.weekday())).time_since_epoch()}; | |
2173 | } | |
2174 | ||
2175 | explicit constexpr | |
2176 | operator local_days() const noexcept | |
2177 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
2178 | ||
2179 | constexpr bool | |
2180 | ok() const noexcept | |
2181 | { return _M_y.ok() && _M_m.ok() && _M_wdl.ok(); } | |
2182 | ||
2183 | friend constexpr bool | |
2184 | operator==(const year_month_weekday_last& __x, | |
2185 | const year_month_weekday_last& __y) noexcept | |
2186 | { | |
2187 | return __x.year() == __y.year() | |
2188 | && __x.month() == __y.month() | |
2189 | && __x.weekday_last() == __y.weekday_last(); | |
2190 | } | |
2191 | ||
2192 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2193 | friend constexpr year_month_weekday_last | |
2194 | operator+(const year_month_weekday_last& __ymwdl, | |
2195 | const months& __dm) noexcept | |
2196 | { | |
2197 | return ((__ymwdl.year() / __ymwdl.month() + __dm) | |
2198 | / __ymwdl.weekday_last()); | |
2199 | } | |
2200 | ||
2201 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2202 | friend constexpr year_month_weekday_last | |
2203 | operator+(const months& __dm, | |
2204 | const year_month_weekday_last& __ymwdl) noexcept | |
2205 | { return __ymwdl + __dm; } | |
2206 | ||
2207 | friend constexpr year_month_weekday_last | |
2208 | operator+(const year_month_weekday_last& __ymwdl, | |
2209 | const years& __dy) noexcept | |
2210 | { return {__ymwdl.year() + __dy, __ymwdl.month(), __ymwdl.weekday_last()}; } | |
2211 | ||
2212 | friend constexpr year_month_weekday_last | |
2213 | operator+(const years& __dy, | |
2214 | const year_month_weekday_last& __ymwdl) noexcept | |
2215 | { return __ymwdl + __dy; } | |
2216 | ||
2217 | template<typename = __detail::__months_years_conversion_disambiguator> | |
2218 | friend constexpr year_month_weekday_last | |
2219 | operator-(const year_month_weekday_last& __ymwdl, | |
2220 | const months& __dm) noexcept | |
2221 | { return __ymwdl + -__dm; } | |
2222 | ||
2223 | friend constexpr year_month_weekday_last | |
2224 | operator-(const year_month_weekday_last& __ymwdl, | |
2225 | const years& __dy) noexcept | |
2226 | { return __ymwdl + -__dy; } | |
2227 | ||
2228 | friend constexpr year_month_weekday_last | |
2229 | operator/(const year_month& __ym, | |
2230 | const chrono::weekday_last& __wdl) noexcept | |
2231 | { return {__ym.year(), __ym.month(), __wdl}; } | |
2232 | ||
2233 | friend constexpr year_month_weekday_last | |
2234 | operator/(const chrono::year& __y, | |
2235 | const chrono::month_weekday_last& __mwdl) noexcept | |
2236 | { return {__y, __mwdl.month(), __mwdl.weekday_last()}; } | |
2237 | ||
2238 | friend constexpr year_month_weekday_last | |
2239 | operator/(int __y, const chrono::month_weekday_last& __mwdl) noexcept | |
2240 | { return chrono::year(__y) / __mwdl; } | |
2241 | ||
2242 | friend constexpr year_month_weekday_last | |
2243 | operator/(const chrono::month_weekday_last& __mwdl, | |
2244 | const chrono::year& __y) noexcept | |
2245 | { return __y / __mwdl; } | |
2246 | ||
2247 | friend constexpr year_month_weekday_last | |
2248 | operator/(const chrono::month_weekday_last& __mwdl, int __y) noexcept | |
2249 | { return chrono::year(__y) / __mwdl; } | |
2250 | }; | |
2251 | ||
2252 | // HH_MM_SS | |
2253 | ||
2254 | /// @cond undocumented | |
2255 | namespace __detail | |
2256 | { | |
2257 | consteval long long | |
2258 | __pow10(unsigned __n) | |
2259 | { | |
2260 | long long __r = 1; | |
2261 | while (__n-- > 0) | |
2262 | __r *= 10; | |
2263 | return __r; | |
2264 | } | |
2265 | ||
2266 | template<typename _Duration> struct __utc_leap_second; | |
2267 | } | |
2268 | /// @endcond | |
2269 | ||
2270 | /** Utility for splitting a duration into hours, minutes, and seconds | |
2271 | * | |
2272 | * This is a convenience type that provides accessors for the constituent | |
2273 | * parts (hours, minutes, seconds and subseconds) of a duration. | |
2274 | * | |
2275 | * @since C++20 | |
2276 | */ | |
2277 | template<typename _Duration> | |
2278 | class hh_mm_ss | |
2279 | { | |
2280 | static_assert( __is_duration<_Duration>::value ); | |
2281 | ||
2282 | private: | |
2283 | static consteval int | |
2284 | _S_fractional_width() | |
2285 | { | |
2286 | auto __den = _Duration::period::den; | |
2287 | const int __multiplicity_2 = std::__countr_zero((uintmax_t)__den); | |
2288 | __den >>= __multiplicity_2; | |
2289 | int __multiplicity_5 = 0; | |
2290 | while ((__den % 5) == 0) | |
2291 | { | |
2292 | ++__multiplicity_5; | |
2293 | __den /= 5; | |
2294 | } | |
2295 | if (__den != 1) | |
2296 | return 6; | |
2297 | ||
2298 | int __width = (__multiplicity_2 > __multiplicity_5 | |
2299 | ? __multiplicity_2 : __multiplicity_5); | |
2300 | if (__width > 18) | |
2301 | __width = 18; | |
2302 | return __width; | |
2303 | } | |
2304 | ||
2305 | constexpr | |
2306 | hh_mm_ss(_Duration __d, bool __is_neg) | |
2307 | : _M_h (duration_cast<chrono::hours>(__d)), | |
2308 | _M_m (duration_cast<chrono::minutes>(__d - hours())), | |
2309 | _M_s (duration_cast<chrono::seconds>(__d - hours() - minutes())), | |
2310 | _M_is_neg(__is_neg) | |
2311 | { | |
2312 | auto __ss = __d - hours() - minutes() - seconds(); | |
2313 | if constexpr (treat_as_floating_point_v<typename precision::rep>) | |
2314 | _M_ss._M_r = __ss.count(); | |
2315 | else if constexpr (precision::period::den != 1) | |
2316 | _M_ss._M_r = duration_cast<precision>(__ss).count(); | |
2317 | } | |
2318 | ||
2319 | static constexpr _Duration | |
2320 | _S_abs(_Duration __d) | |
2321 | { | |
2322 | if constexpr (numeric_limits<typename _Duration::rep>::is_signed) | |
2323 | return chrono::abs(__d); | |
2324 | else | |
2325 | return __d; | |
2326 | } | |
2327 | ||
2328 | public: | |
2329 | static constexpr unsigned fractional_width = {_S_fractional_width()}; | |
2330 | ||
2331 | using precision | |
2332 | = duration<common_type_t<typename _Duration::rep, | |
2333 | chrono::seconds::rep>, | |
2334 | ratio<1, __detail::__pow10(fractional_width)>>; | |
2335 | ||
2336 | constexpr hh_mm_ss() noexcept = default; | |
2337 | ||
2338 | constexpr explicit | |
2339 | hh_mm_ss(_Duration __d) | |
2340 | : hh_mm_ss(_S_abs(__d), __d < _Duration::zero()) | |
2341 | { } | |
2342 | ||
2343 | constexpr bool | |
2344 | is_negative() const noexcept | |
2345 | { | |
2346 | if constexpr (!_S_is_unsigned) | |
2347 | return _M_is_neg; | |
2348 | else | |
2349 | return false; | |
2350 | } | |
2351 | ||
2352 | constexpr chrono::hours | |
2353 | hours() const noexcept | |
2354 | { return _M_h; } | |
2355 | ||
2356 | constexpr chrono::minutes | |
2357 | minutes() const noexcept | |
2358 | { return _M_m; } | |
2359 | ||
2360 | constexpr chrono::seconds | |
2361 | seconds() const noexcept | |
2362 | { return _M_s; } | |
2363 | ||
2364 | constexpr precision | |
2365 | subseconds() const noexcept | |
2366 | { return static_cast<precision>(_M_ss); } | |
2367 | ||
2368 | constexpr explicit | |
2369 | operator precision() const noexcept | |
2370 | { return to_duration(); } | |
2371 | ||
2372 | constexpr precision | |
2373 | to_duration() const noexcept | |
2374 | { | |
2375 | if constexpr (!_S_is_unsigned) | |
2376 | if (_M_is_neg) | |
2377 | return -(_M_h + _M_m + _M_s + subseconds()); | |
2378 | return _M_h + _M_m + _M_s + subseconds(); | |
2379 | } | |
2380 | ||
2381 | private: | |
2382 | static constexpr bool _S_is_unsigned | |
2383 | = __and_v<is_integral<typename _Duration::rep>, | |
2384 | is_unsigned<typename _Duration::rep>>; | |
2385 | ||
2386 | template<typename _Ratio> | |
2387 | using __byte_duration = duration<unsigned char, _Ratio>; | |
2388 | ||
2389 | // The type of the _M_ss member that holds the subsecond precision. | |
2390 | template<typename _Dur> | |
2391 | struct __subseconds | |
2392 | { | |
2393 | typename _Dur::rep _M_r{}; | |
2394 | ||
2395 | constexpr explicit | |
2396 | operator _Dur() const noexcept | |
2397 | { return _Dur(_M_r); } | |
2398 | }; | |
2399 | ||
2400 | // An empty class if this precision doesn't need subseconds. | |
2401 | template<typename _Rep> | |
2402 | requires (!treat_as_floating_point_v<_Rep>) | |
2403 | struct __subseconds<duration<_Rep, ratio<1>>> | |
2404 | { | |
2405 | constexpr explicit | |
2406 | operator duration<_Rep, ratio<1>>() const noexcept | |
2407 | { return {}; } | |
2408 | }; | |
2409 | ||
2410 | template<typename _Rep, typename _Period> | |
2411 | requires (!treat_as_floating_point_v<_Rep>) | |
2412 | && ratio_less_v<_Period, ratio<1, 1>> | |
2413 | && ratio_greater_equal_v<_Period, ratio<1, 250>> | |
2414 | struct __subseconds<duration<_Rep, _Period>> | |
2415 | { | |
2416 | unsigned char _M_r{}; | |
2417 | ||
2418 | constexpr explicit | |
2419 | operator duration<_Rep, _Period>() const noexcept | |
2420 | { return duration<_Rep, _Period>(_M_r); } | |
2421 | }; | |
2422 | ||
2423 | template<typename _Rep, typename _Period> | |
2424 | requires (!treat_as_floating_point_v<_Rep>) | |
2425 | && ratio_less_v<_Period, ratio<1, 250>> | |
2426 | && ratio_greater_equal_v<_Period, ratio<1, 4000000000>> | |
2427 | struct __subseconds<duration<_Rep, _Period>> | |
2428 | { | |
2429 | uint_least32_t _M_r{}; | |
2430 | ||
2431 | constexpr explicit | |
2432 | operator duration<_Rep, _Period>() const noexcept | |
2433 | { return duration<_Rep, _Period>(_M_r); } | |
2434 | }; | |
2435 | ||
2436 | chrono::hours _M_h{}; | |
2437 | __byte_duration<ratio<60>> _M_m{}; | |
2438 | __byte_duration<ratio<1>> _M_s{}; | |
2439 | bool _M_is_neg{}; | |
2440 | __subseconds<precision> _M_ss{}; | |
2441 | ||
2442 | template<typename> friend struct __detail::__utc_leap_second; | |
2443 | }; | |
2444 | ||
2445 | /// @cond undocumented | |
2446 | namespace __detail | |
2447 | { | |
2448 | // Represents a time that is within a leap second insertion. | |
2449 | template<typename _Duration> | |
2450 | struct __utc_leap_second | |
2451 | { | |
2452 | explicit | |
2453 | __utc_leap_second(const sys_time<_Duration>& __s) | |
2454 | : _M_date(chrono::floor<days>(__s)), _M_time(__s - _M_date) | |
2455 | { | |
2456 | ++_M_time._M_s; | |
2457 | } | |
2458 | ||
2459 | sys_days _M_date; | |
2460 | hh_mm_ss<common_type_t<_Duration, days>> _M_time; | |
2461 | }; | |
2462 | } | |
2463 | /// @endcond | |
2464 | ||
2465 | // 12/24 HOURS FUNCTIONS | |
2466 | ||
2467 | constexpr bool | |
2468 | is_am(const hours& __h) noexcept | |
2469 | { return 0h <= __h && __h <= 11h; } | |
2470 | ||
2471 | constexpr bool | |
2472 | is_pm(const hours& __h) noexcept | |
2473 | { return 12h <= __h && __h <= 23h; } | |
2474 | ||
2475 | constexpr hours | |
2476 | make12(const hours& __h) noexcept | |
2477 | { | |
2478 | if (__h == 0h) | |
2479 | return 12h; | |
2480 | else if (__h > 12h) | |
2481 | return __h - 12h; | |
2482 | return __h; | |
2483 | } | |
2484 | ||
2485 | constexpr hours | |
2486 | make24(const hours& __h, bool __is_pm) noexcept | |
2487 | { | |
2488 | if (!__is_pm) | |
2489 | { | |
2490 | if (__h == 12h) | |
2491 | return 0h; | |
2492 | else | |
2493 | return __h; | |
2494 | } | |
2495 | else | |
2496 | { | |
2497 | if (__h == 12h) | |
2498 | return __h; | |
2499 | else | |
2500 | return __h + 12h; | |
2501 | } | |
2502 | } | |
2503 | ||
2504 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI | |
2505 | // C++20 [time.zones] Time zones | |
2506 | ||
2507 | struct tzdb; | |
2508 | ||
2509 | struct sys_info | |
2510 | { | |
2511 | sys_seconds begin; | |
2512 | sys_seconds end; | |
2513 | seconds offset; | |
2514 | minutes save; | |
2515 | string abbrev; | |
2516 | }; | |
2517 | ||
2518 | struct local_info | |
2519 | { | |
2520 | static constexpr int unique = 0; | |
2521 | static constexpr int nonexistent = 1; | |
2522 | static constexpr int ambiguous = 2; | |
2523 | ||
2524 | int result; | |
2525 | sys_info first; | |
2526 | sys_info second; | |
2527 | }; | |
2528 | ||
2529 | class nonexistent_local_time : public runtime_error | |
2530 | { | |
2531 | public: | |
2532 | template<typename _Duration> | |
2533 | nonexistent_local_time(const local_time<_Duration>& __tp, | |
2534 | const local_info& __i) | |
2535 | : runtime_error(_S_make_what_str(__tp, __i)) | |
2536 | { __glibcxx_assert(__i.result == local_info::nonexistent); } | |
2537 | ||
2538 | private: | |
2539 | template<typename _Duration> | |
2540 | static string | |
2541 | _S_make_what_str(const local_time<_Duration>& __tp, | |
2542 | const local_info& __i) | |
2543 | { | |
2544 | std::ostringstream __os; | |
2545 | __os << __tp << " is in a gap between\n" | |
2546 | << local_seconds(__i.first.end.time_since_epoch()) | |
2547 | + __i.first.offset << ' ' << __i.first.abbrev << " and\n" | |
2548 | << local_seconds(__i.second.begin.time_since_epoch()) | |
2549 | + __i.second.offset << ' ' << __i.second.abbrev | |
2550 | << " which are both equivalent to\n" | |
2551 | << __i.first.end << " UTC"; | |
2552 | return std::move(__os).str(); | |
2553 | } | |
2554 | }; | |
2555 | ||
2556 | class ambiguous_local_time : public runtime_error | |
2557 | { | |
2558 | public: | |
2559 | template<typename _Duration> | |
2560 | ambiguous_local_time(const local_time<_Duration>& __tp, | |
2561 | const local_info& __i) | |
2562 | : runtime_error(_S_make_what_str(__tp, __i)) | |
2563 | { __glibcxx_assert(__i.result == local_info::ambiguous); } | |
2564 | ||
2565 | private: | |
2566 | template<typename _Duration> | |
2567 | static string | |
2568 | _S_make_what_str(const local_time<_Duration>& __tp, | |
2569 | const local_info& __i) | |
2570 | { | |
2571 | std::ostringstream __os; | |
2572 | __os << __tp << " is ambiguous. It could be\n" | |
2573 | << __tp << ' ' << __i.first.abbrev << " == " | |
2574 | << __tp - __i.first.offset << " UTC or\n" | |
2575 | << __tp << ' ' << __i.second.abbrev << " == " | |
2576 | << __tp - __i.second.offset << " UTC"; | |
2577 | return std::move(__os).str(); | |
2578 | } | |
2579 | }; | |
2580 | ||
2581 | template<typename _Duration> | |
2582 | [[noreturn]] void | |
2583 | __throw_bad_local_time(const local_time<_Duration>& __tp, | |
2584 | const local_info& __i) | |
2585 | { | |
2586 | #if __cpp_exceptions | |
2587 | if (__i.result == local_info::nonexistent) | |
2588 | throw nonexistent_local_time(__tp, __i); | |
2589 | throw ambiguous_local_time(__tp, __i); | |
2590 | #else | |
2591 | __builtin_abort(); | |
2592 | #endif | |
2593 | } | |
2594 | ||
2595 | enum class choose { earliest, latest }; | |
2596 | ||
2597 | class time_zone | |
2598 | { | |
2599 | public: | |
2600 | time_zone(time_zone&&) = default; | |
2601 | time_zone& operator=(time_zone&&) = default; | |
2602 | ||
2603 | ~time_zone(); | |
2604 | ||
2605 | [[nodiscard]] | |
2606 | string_view name() const noexcept { return _M_name; } | |
2607 | ||
2608 | template<typename _Duration> | |
2609 | sys_info | |
2610 | get_info(const sys_time<_Duration>& __st) const | |
2611 | { return _M_get_sys_info(chrono::floor<seconds>(__st)); } | |
2612 | ||
2613 | template<typename _Duration> | |
2614 | local_info | |
2615 | get_info(const local_time<_Duration>& __tp) const | |
2616 | { return _M_get_local_info(chrono::floor<seconds>(__tp)); } | |
2617 | ||
2618 | template<typename _Duration> | |
2619 | sys_time<common_type_t<_Duration, seconds>> | |
2620 | to_sys(const local_time<_Duration>& __tp) const | |
2621 | { | |
2622 | local_info __info = get_info(__tp); | |
2623 | ||
2624 | if (__info.result != local_info::unique) | |
2625 | __throw_bad_local_time(__tp, __info); | |
2626 | ||
2627 | return sys_time<_Duration>(__tp.time_since_epoch()) | |
2628 | - __info.first.offset; | |
2629 | } | |
2630 | ||
2631 | template<typename _Duration> | |
2632 | sys_time<common_type_t<_Duration, seconds>> | |
2633 | to_sys(const local_time<_Duration>& __tp, choose __z) const | |
2634 | { | |
2635 | local_info __info = get_info(__tp); | |
2636 | ||
2637 | if (__info.result == local_info::nonexistent) | |
2638 | return __info.first.end; // Last second of the previous sys_info. | |
2639 | ||
2640 | sys_time<_Duration> __st(__tp.time_since_epoch()); | |
2641 | ||
2642 | if (__info.result == local_info::ambiguous && __z == choose::latest) | |
2643 | return __st - __info.second.offset; // Time in the later sys_info. | |
2644 | // else if __z == earliest, use __info.first.offset as below: | |
2645 | ||
2646 | return __st - __info.first.offset; | |
2647 | } | |
2648 | ||
2649 | template<typename _Duration> | |
2650 | local_time<common_type_t<_Duration, seconds>> | |
2651 | to_local(const sys_time<_Duration>& __tp) const | |
2652 | { | |
2653 | auto __d = (__tp + get_info(__tp).offset).time_since_epoch(); | |
2654 | return local_time<common_type_t<_Duration, seconds>>(__d); | |
2655 | } | |
2656 | ||
2657 | [[nodiscard]] friend bool | |
2658 | operator==(const time_zone& __x, const time_zone& __y) noexcept | |
2659 | { return __x._M_name == __y._M_name; } | |
2660 | ||
2661 | [[nodiscard]] friend strong_ordering | |
2662 | operator<=>(const time_zone& __x, const time_zone& __y) noexcept | |
2663 | { return __x._M_name <=> __y._M_name; } | |
2664 | ||
2665 | private: | |
2666 | sys_info _M_get_sys_info(sys_seconds) const; | |
2667 | local_info _M_get_local_info(local_seconds) const; | |
2668 | ||
2669 | friend const tzdb& reload_tzdb(); | |
2670 | friend struct tzdb; | |
2671 | friend class tzdb_list; | |
2672 | ||
2673 | struct _Impl; | |
2674 | ||
2675 | explicit time_zone(unique_ptr<_Impl> __p); | |
2676 | string _M_name; | |
2677 | unique_ptr<_Impl> _M_impl; | |
2678 | }; | |
2679 | ||
2680 | const time_zone* locate_zone(string_view __tz_name); | |
2681 | const time_zone* current_zone(); | |
2682 | ||
2683 | /** The list of `chrono::tzdb` objects | |
2684 | * | |
2685 | * A single object of this type is constructed by the C++ runtime, | |
2686 | * and can be accessed by calling `chrono::get_tzdb_list()`. | |
2687 | * | |
2688 | * The front of the list is the current `tzdb` object and can be accessed | |
2689 | * via `chrono::get_tzdb_list().front()` or `chrono::get_tzdb()` or | |
2690 | * `*chrono::get_tzdb_list().begin()`. | |
2691 | * | |
2692 | * The `chrono::reload_tzdb()` function will check for a newer version | |
2693 | * and if found, insert it at the front of the list. | |
2694 | * | |
2695 | * @since C++20 | |
2696 | */ | |
2697 | class tzdb_list | |
2698 | { | |
2699 | struct _Node; | |
2700 | ||
2701 | public: | |
2702 | tzdb_list(const tzdb_list&) = delete; | |
2703 | tzdb_list& operator=(const tzdb_list&) = delete; | |
2704 | ||
2705 | /** An iterator into the `tzdb_list` | |
2706 | * | |
2707 | * As a extension, in libstdc++ each `tzdb` is reference-counted | |
2708 | * and the `const_iterator` type shares ownership of the object it | |
2709 | * refers to. This ensures that a `tzdb` erased from the list will | |
2710 | * not be destroyed while there is an iterator that refers to it. | |
2711 | */ | |
2712 | class const_iterator | |
2713 | { | |
2714 | public: | |
2715 | using value_type = tzdb; | |
2716 | using reference = const tzdb&; | |
2717 | using pointer = const tzdb*; | |
2718 | using difference_type = ptrdiff_t; | |
2719 | using iterator_category = forward_iterator_tag; | |
2720 | ||
2721 | constexpr const_iterator() = default; | |
2722 | const_iterator(const const_iterator&) = default; | |
2723 | const_iterator(const_iterator&&) = default; | |
2724 | const_iterator& operator=(const const_iterator&) = default; | |
2725 | const_iterator& operator=(const_iterator&&) = default; | |
2726 | ||
2727 | reference operator*() const noexcept; | |
2728 | pointer operator->() const noexcept { return &**this; } | |
2729 | const_iterator& operator++(); | |
2730 | const_iterator operator++(int); | |
2731 | ||
2732 | bool operator==(const const_iterator&) const noexcept = default; | |
2733 | ||
2734 | private: | |
2735 | explicit const_iterator(const shared_ptr<_Node>&) noexcept; | |
2736 | ||
2737 | friend class tzdb_list; | |
2738 | ||
2739 | shared_ptr<_Node> _M_node; | |
2740 | void* _M_reserved = nullptr; | |
2741 | }; | |
2742 | ||
2743 | /** Access the current `tzdb` at the front of the list. | |
2744 | * | |
2745 | * This returns a reference to the same object as `chrono::get_tzdb()`. | |
2746 | * | |
2747 | * @returns A reference to the current tzdb object. | |
2748 | * @since C++20 | |
2749 | */ | |
2750 | const tzdb& front() const noexcept; | |
2751 | ||
2752 | /** Remove the tzdb object _after_ the one the iterator refers to. | |
2753 | * | |
2754 | * Calling this function concurently with any of `front()`, `begin()`, | |
2755 | * or `end()` does not cause a data race, but in general this function | |
2756 | * is not thread-safe. The behaviour may be undefined if erasing an | |
2757 | * element from the list while another thread is calling the same | |
2758 | * function, or incrementing an iterator into the list, or accessing | |
2759 | * the element being erased (unless it is accessed through an iterator). | |
2760 | * | |
2761 | * @param __p A dereferenceable iterator. | |
2762 | * @returns An iterator the element after the one that was erased | |
2763 | * (or `end()` if there is no such element). | |
2764 | * @since C++20 | |
2765 | */ | |
2766 | const_iterator erase_after(const_iterator __p); | |
2767 | ||
2768 | const_iterator begin() const noexcept; | |
2769 | const_iterator end() const noexcept { return {}; } | |
2770 | const_iterator cbegin() const noexcept { return begin(); } | |
2771 | const_iterator cend() const noexcept { return end(); } | |
2772 | ||
2773 | private: | |
2774 | constexpr explicit tzdb_list(nullptr_t); | |
2775 | ||
2776 | friend tzdb_list& get_tzdb_list(); | |
2777 | friend const tzdb& get_tzdb(); | |
2778 | friend const tzdb& reload_tzdb(); | |
2779 | friend struct tzdb; | |
2780 | friend class leap_second; | |
2781 | friend struct time_zone::_Impl; | |
2782 | friend class time_zone_link; | |
2783 | }; | |
2784 | ||
2785 | class time_zone_link | |
2786 | { | |
2787 | public: | |
2788 | time_zone_link(time_zone_link&&) = default; | |
2789 | time_zone_link& operator=(time_zone_link&&) = default; | |
2790 | ||
2791 | string_view name() const noexcept { return _M_name; } | |
2792 | string_view target() const noexcept { return _M_target; } | |
2793 | ||
2794 | friend bool | |
2795 | operator==(const time_zone_link& __x, const time_zone_link& __y) noexcept | |
2796 | { return __x.name() == __y.name(); } | |
2797 | ||
2798 | friend strong_ordering | |
2799 | operator<=>(const time_zone_link& __x, const time_zone_link& __y) noexcept | |
2800 | { return __x.name() <=> __y.name(); } | |
2801 | ||
2802 | private: | |
2803 | friend const tzdb& reload_tzdb(); | |
2804 | friend struct tzdb_list::_Node; | |
2805 | ||
2806 | explicit time_zone_link(nullptr_t) { } | |
2807 | ||
2808 | string _M_name; | |
2809 | string _M_target; | |
2810 | }; | |
2811 | ||
2812 | class leap_second | |
2813 | { | |
2814 | public: | |
2815 | leap_second(const leap_second&) = default; | |
2816 | leap_second& operator=(const leap_second&) = default; | |
2817 | ||
2818 | [[nodiscard]] | |
2819 | constexpr sys_seconds | |
2820 | date() const noexcept | |
2821 | { | |
2822 | if (_M_s >= _M_s.zero()) [[likely]] | |
2823 | return sys_seconds(_M_s); | |
2824 | return sys_seconds(-_M_s); | |
2825 | } | |
2826 | ||
2827 | [[nodiscard]] | |
2828 | constexpr seconds | |
2829 | value() const noexcept | |
2830 | { | |
2831 | if (_M_s >= _M_s.zero()) [[likely]] | |
2832 | return seconds(1); | |
2833 | return seconds(-1); | |
2834 | } | |
2835 | ||
2836 | // This can be defaulted because the database will never contain two | |
2837 | // leap_second objects with the same date but different signs. | |
2838 | [[nodiscard]] friend constexpr bool | |
2839 | operator==(const leap_second&, const leap_second&) noexcept = default; | |
2840 | ||
2841 | [[nodiscard]] friend constexpr strong_ordering | |
2842 | operator<=>(const leap_second& __x, const leap_second& __y) noexcept | |
2843 | { return __x.date() <=> __y.date(); } | |
2844 | ||
2845 | template<typename _Duration> | |
2846 | [[nodiscard]] friend constexpr bool | |
2847 | operator==(const leap_second& __x, | |
2848 | const sys_time<_Duration>& __y) noexcept | |
2849 | { return __x.date() == __y; } | |
2850 | ||
2851 | template<typename _Duration> | |
2852 | [[nodiscard]] friend constexpr bool | |
2853 | operator<(const leap_second& __x, | |
2854 | const sys_time<_Duration>& __y) noexcept | |
2855 | { return __x.date() < __y; } | |
2856 | ||
2857 | template<typename _Duration> | |
2858 | [[nodiscard]] friend constexpr bool | |
2859 | operator<(const sys_time<_Duration>& __x, | |
2860 | const leap_second& __y) noexcept | |
2861 | { return __x < __y.date(); } | |
2862 | ||
2863 | template<typename _Duration> | |
2864 | [[nodiscard]] friend constexpr bool | |
2865 | operator>(const leap_second& __x, | |
2866 | const sys_time<_Duration>& __y) noexcept | |
2867 | { return __y < __x.date(); } | |
2868 | ||
2869 | template<typename _Duration> | |
2870 | [[nodiscard]] friend constexpr bool | |
2871 | operator>(const sys_time<_Duration>& __x, | |
2872 | const leap_second& __y) noexcept | |
2873 | { return __y.date() < __x; } | |
2874 | ||
2875 | template<typename _Duration> | |
2876 | [[nodiscard]] friend constexpr bool | |
2877 | operator<=(const leap_second& __x, | |
2878 | const sys_time<_Duration>& __y) noexcept | |
2879 | { return !(__y < __x.date()); } | |
2880 | ||
2881 | template<typename _Duration> | |
2882 | [[nodiscard]] friend constexpr bool | |
2883 | operator<=(const sys_time<_Duration>& __x, | |
2884 | const leap_second& __y) noexcept | |
2885 | { return !(__y.date() < __x); } | |
2886 | ||
2887 | template<typename _Duration> | |
2888 | [[nodiscard]] friend constexpr bool | |
2889 | operator>=(const leap_second& __x, | |
2890 | const sys_time<_Duration>& __y) noexcept | |
2891 | { return !(__x.date() < __y); } | |
2892 | ||
2893 | template<typename _Duration> | |
2894 | [[nodiscard]] friend constexpr bool | |
2895 | operator>=(const sys_time<_Duration>& __x, | |
2896 | const leap_second& __y) noexcept | |
2897 | { return !(__x < __y.date()); } | |
2898 | ||
2899 | template<three_way_comparable_with<seconds> _Duration> | |
2900 | [[nodiscard]] friend constexpr auto | |
2901 | operator<=>(const leap_second& __x, | |
2902 | const sys_time<_Duration>& __y) noexcept | |
2903 | { return __x.date() <=> __y; } | |
2904 | ||
2905 | private: | |
2906 | explicit leap_second(seconds::rep __s) : _M_s(__s) { } | |
2907 | ||
2908 | friend struct tzdb_list::_Node; | |
2909 | ||
2910 | friend const tzdb& reload_tzdb(); | |
2911 | ||
2912 | template<typename _Duration> | |
2913 | friend leap_second_info | |
2914 | get_leap_second_info(const utc_time<_Duration>&); | |
2915 | ||
2916 | seconds _M_s; // == date().time_since_epoch() * value().count() | |
2917 | }; | |
2918 | ||
2919 | template<class _Tp> struct zoned_traits { }; | |
2920 | ||
2921 | template<> | |
2922 | struct zoned_traits<const time_zone*> | |
2923 | { | |
2924 | static const time_zone* | |
2925 | default_zone() | |
2926 | { return std::chrono::locate_zone("UTC"); } | |
2927 | ||
2928 | static const time_zone* | |
2929 | locate_zone(string_view __name) | |
2930 | { return std::chrono::locate_zone(__name); } | |
2931 | }; | |
2932 | ||
2933 | struct tzdb | |
2934 | { | |
2935 | string version; | |
2936 | _GLIBCXX_STD_C::vector<time_zone> zones; | |
2937 | _GLIBCXX_STD_C::vector<time_zone_link> links; | |
2938 | _GLIBCXX_STD_C::vector<leap_second> leap_seconds; | |
2939 | ||
2940 | const time_zone* | |
2941 | locate_zone(string_view __tz_name) const; | |
2942 | ||
2943 | const time_zone* | |
2944 | current_zone() const; | |
2945 | ||
2946 | private: | |
2947 | friend const tzdb& reload_tzdb(); | |
2948 | friend class time_zone; | |
2949 | friend struct tzdb_list::_Node; | |
2950 | }; | |
2951 | ||
2952 | tzdb_list& get_tzdb_list(); | |
2953 | const tzdb& get_tzdb(); | |
2954 | ||
2955 | const tzdb& reload_tzdb(); | |
2956 | string remote_version(); | |
2957 | ||
2958 | template<typename _Duration, typename _TimeZonePtr = const time_zone*> | |
2959 | class zoned_time | |
2960 | { | |
2961 | static_assert(__is_duration_v<_Duration>); | |
2962 | ||
2963 | using _Traits = zoned_traits<_TimeZonePtr>; | |
2964 | ||
2965 | // Every constructor that accepts a string_view as its first parameter | |
2966 | // does not participate in class template argument deduction. | |
2967 | using string_view = type_identity_t<std::string_view>; | |
2968 | ||
2969 | public: | |
2970 | using duration = common_type_t<_Duration, seconds>; | |
2971 | ||
2972 | zoned_time() requires requires { _Traits::default_zone(); } | |
2973 | { } | |
2974 | ||
2975 | zoned_time(const zoned_time&) = default; | |
2976 | zoned_time& operator=(const zoned_time&) = default; | |
2977 | ||
2978 | zoned_time(const sys_time<_Duration>& __st) | |
2979 | requires requires { _Traits::default_zone(); } | |
2980 | : _M_tp(__st) | |
2981 | { } | |
2982 | ||
2983 | explicit | |
2984 | zoned_time(_TimeZonePtr __z) : _M_zone(std::move(__z)) { } | |
2985 | ||
2986 | explicit | |
2987 | zoned_time(string_view __name) | |
2988 | requires requires { | |
2989 | _TimeZonePtr{_Traits::locate_zone(std::string_view{})}; | |
2990 | } | |
2991 | : _M_zone(_Traits::locate_zone(__name)) | |
2992 | { } | |
2993 | ||
2994 | template<typename _Duration2> | |
2995 | zoned_time(const zoned_time<_Duration2, _TimeZonePtr>& __zt) | |
2996 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
2997 | : _M_zone(__zt._M_zone), _M_tp(__zt._M_tp) | |
2998 | { } | |
2999 | ||
3000 | zoned_time(_TimeZonePtr __z, const sys_time<_Duration>& __st) | |
3001 | : _M_zone(std::move(__z)), _M_tp(__st) | |
3002 | { } | |
3003 | ||
3004 | zoned_time(string_view __name, const sys_time<_Duration>& __st) | |
3005 | : zoned_time(_Traits::locate_zone(__name), __st) | |
3006 | { } | |
3007 | ||
3008 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp) | |
3009 | requires requires { | |
3010 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; | |
3011 | } | |
3012 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp)) | |
3013 | { } | |
3014 | ||
3015 | zoned_time(string_view __name, const local_time<_Duration>& __tp) | |
3016 | requires requires (_TimeZonePtr __z) { | |
3017 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3018 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; | |
3019 | } | |
3020 | : zoned_time(_Traits::locate_zone(__name), __tp) | |
3021 | { } | |
3022 | ||
3023 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp, | |
3024 | choose __c) | |
3025 | requires requires { | |
3026 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; | |
3027 | } | |
3028 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp, __c)) | |
3029 | { } | |
3030 | ||
3031 | zoned_time(string_view __name, const local_time<_Duration>& __tp, | |
3032 | choose __c) | |
3033 | requires requires (_TimeZonePtr __z) { | |
3034 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3035 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; | |
3036 | } | |
3037 | : _M_zone(_Traits::locate_zone(__name)), | |
3038 | _M_tp(_M_zone->to_sys(__tp, __c)) | |
3039 | { } | |
3040 | ||
3041 | template<typename _Duration2, typename _TimeZonePtr2> | |
3042 | zoned_time(_TimeZonePtr __z, | |
3043 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) | |
3044 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3045 | : _M_zone(__z), _M_tp(__zt._M_tp) | |
3046 | { } | |
3047 | ||
3048 | template<typename _Duration2, typename _TimeZonePtr2> | |
3049 | zoned_time(_TimeZonePtr __z, | |
3050 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, | |
3051 | choose) | |
3052 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3053 | : _M_zone(__z), _M_tp(__zt._M_tp) | |
3054 | { } | |
3055 | ||
3056 | template<typename _Duration2, typename _TimeZonePtr2> | |
3057 | zoned_time(string_view __name, | |
3058 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) | |
3059 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3060 | && requires { | |
3061 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3062 | } | |
3063 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) | |
3064 | { } | |
3065 | ||
3066 | template<typename _Duration2, typename _TimeZonePtr2> | |
3067 | zoned_time(string_view __name, | |
3068 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, | |
3069 | choose) | |
3070 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3071 | && requires { | |
3072 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3073 | } | |
3074 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) | |
3075 | { } | |
3076 | ||
3077 | zoned_time& | |
3078 | operator=(const sys_time<_Duration>& __st) | |
3079 | { | |
3080 | _M_tp = __st; | |
3081 | return *this; | |
3082 | } | |
3083 | ||
3084 | zoned_time& | |
3085 | operator=(const local_time<_Duration>& __lt) | |
3086 | { | |
3087 | _M_tp = _M_zone->to_sys(__lt); | |
3088 | return *this; | |
3089 | } | |
3090 | ||
3091 | [[nodiscard]] | |
3092 | operator sys_time<duration>() const { return _M_tp; } | |
3093 | ||
3094 | [[nodiscard]] | |
3095 | explicit operator local_time<duration>() const | |
3096 | { return get_local_time(); } | |
3097 | ||
3098 | [[nodiscard]] | |
3099 | _TimeZonePtr | |
3100 | get_time_zone() const | |
3101 | { return _M_zone; } | |
3102 | ||
3103 | [[nodiscard]] | |
3104 | local_time<duration> | |
3105 | get_local_time() const | |
3106 | { return _M_zone->to_local(_M_tp); } | |
3107 | ||
3108 | [[nodiscard]] | |
3109 | sys_time<duration> | |
3110 | get_sys_time() const | |
3111 | { return _M_tp; } | |
3112 | ||
3113 | [[nodiscard]] | |
3114 | sys_info | |
3115 | get_info() const | |
3116 | { return _M_zone->get_info(_M_tp); } | |
3117 | ||
3118 | [[nodiscard]] friend bool | |
3119 | operator==(const zoned_time&, const zoned_time&) = default; | |
3120 | ||
3121 | private: | |
3122 | _TimeZonePtr _M_zone{ _Traits::default_zone() }; | |
3123 | sys_time<duration> _M_tp{}; | |
3124 | ||
3125 | template<typename _Duration2, typename _TimeZonePtr2> | |
3126 | friend class zoned_time; | |
3127 | }; | |
3128 | ||
3129 | zoned_time() -> zoned_time<seconds>; | |
3130 | ||
3131 | template<typename _Duration> | |
3132 | zoned_time(sys_time<_Duration>) | |
3133 | -> zoned_time<common_type_t<_Duration, seconds>>; | |
3134 | ||
3135 | /// @cond undocumented | |
3136 | template<typename _TimeZonePtrOrName> | |
3137 | using __time_zone_representation | |
3138 | = __conditional_t<is_convertible_v<_TimeZonePtrOrName, string_view>, | |
3139 | const time_zone*, | |
3140 | remove_cvref_t<_TimeZonePtrOrName>>; | |
3141 | /// @endcond | |
3142 | ||
3143 | template<typename _TimeZonePtrOrName> | |
3144 | zoned_time(_TimeZonePtrOrName&&) | |
3145 | -> zoned_time<seconds, __time_zone_representation<_TimeZonePtrOrName>>; | |
3146 | ||
3147 | template<typename _TimeZonePtrOrName, typename _Duration> | |
3148 | zoned_time(_TimeZonePtrOrName&&, sys_time<_Duration>) | |
3149 | -> zoned_time<common_type_t<_Duration, seconds>, | |
3150 | __time_zone_representation<_TimeZonePtrOrName>>; | |
3151 | ||
3152 | template<typename _TimeZonePtrOrName, typename _Duration> | |
3153 | zoned_time(_TimeZonePtrOrName&&, local_time<_Duration>, | |
3154 | choose = choose::earliest) | |
3155 | -> zoned_time<common_type_t<_Duration, seconds>, | |
3156 | __time_zone_representation<_TimeZonePtrOrName>>; | |
3157 | ||
3158 | template<typename _Duration, typename _TimeZonePtrOrName, | |
3159 | typename _TimeZonePtr2> | |
3160 | zoned_time(_TimeZonePtrOrName&&, zoned_time<_Duration, _TimeZonePtr2>, | |
3161 | choose = choose::earliest) | |
3162 | -> zoned_time<common_type_t<_Duration, seconds>, | |
3163 | __time_zone_representation<_TimeZonePtrOrName>>; | |
3164 | ||
3165 | template<typename _Dur1, typename _TZPtr1, typename _Dur2, typename _TZPtr2> | |
3166 | [[nodiscard]] | |
3167 | inline bool | |
3168 | operator==(const zoned_time<_Dur1, _TZPtr1>& __x, | |
3169 | const zoned_time<_Dur2, _TZPtr2>& __y) | |
3170 | { | |
3171 | return __x.get_time_zone() == __y.get_time_zone() | |
3172 | && __x.get_sys_time() == __y.get_sys_time(); | |
3173 | } | |
3174 | ||
3175 | using zoned_seconds = zoned_time<seconds>; | |
3176 | #endif // _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI | |
3177 | ||
3178 | namespace __detail | |
3179 | { | |
3180 | inline leap_second_info | |
3181 | __get_leap_second_info(sys_seconds __ss, bool __is_utc) | |
3182 | { | |
3183 | if (__ss < sys_seconds{}) [[unlikely]] | |
3184 | return {}; | |
3185 | ||
3186 | const seconds::rep __leaps[] { | |
3187 | 78796800, // 1 Jul 1972 | |
3188 | 94694400, // 1 Jan 1973 | |
3189 | 126230400, // 1 Jan 1974 | |
3190 | 157766400, // 1 Jan 1975 | |
3191 | 189302400, // 1 Jan 1976 | |
3192 | 220924800, // 1 Jan 1977 | |
3193 | 252460800, // 1 Jan 1978 | |
3194 | 283996800, // 1 Jan 1979 | |
3195 | 315532800, // 1 Jan 1980 | |
3196 | 362793600, // 1 Jul 1981 | |
3197 | 394329600, // 1 Jul 1982 | |
3198 | 425865600, // 1 Jul 1983 | |
3199 | 489024000, // 1 Jul 1985 | |
3200 | 567993600, // 1 Jan 1988 | |
3201 | 631152000, // 1 Jan 1990 | |
3202 | 662688000, // 1 Jan 1991 | |
3203 | 709948800, // 1 Jul 1992 | |
3204 | 741484800, // 1 Jul 1993 | |
3205 | 773020800, // 1 Jul 1994 | |
3206 | 820454400, // 1 Jan 1996 | |
3207 | 867715200, // 1 Jul 1997 | |
3208 | 915148800, // 1 Jan 1999 | |
3209 | 1136073600, // 1 Jan 2006 | |
3210 | 1230768000, // 1 Jan 2009 | |
3211 | 1341100800, // 1 Jul 2012 | |
3212 | 1435708800, // 1 Jul 2015 | |
3213 | 1483228800, // 1 Jan 2017 | |
3214 | }; | |
3215 | // The list above is known to be valid until (at least) this date | |
3216 | // and only contains positive leap seconds. | |
3217 | const sys_seconds __expires(1703721600s); // 2023-12-28 00:00:00 UTC | |
3218 | ||
3219 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI | |
3220 | if (__ss > __expires) | |
3221 | { | |
3222 | // Use updated leap_seconds from tzdb. | |
3223 | size_t __n = std::size(__leaps); | |
3224 | ||
3225 | auto __db = get_tzdb_list().begin(); | |
3226 | auto __first = __db->leap_seconds.begin() + __n; | |
3227 | auto __last = __db->leap_seconds.end(); | |
3228 | auto __pos = std::upper_bound(__first, __last, __ss); | |
3229 | seconds __elapsed(__n); | |
3230 | for (auto __i = __first; __i != __pos; ++__i) | |
3231 | __elapsed += __i->value(); | |
3232 | ||
3233 | if (__is_utc) | |
3234 | { | |
3235 | // Convert utc_time to sys_time: | |
3236 | __ss -= __elapsed; | |
3237 | // See if that sys_time is before (or during) previous leap sec: | |
3238 | if (__pos != __first && __ss < __pos[-1]) | |
3239 | { | |
3240 | if ((__ss + 1s) >= __pos[-1]) | |
3241 | return {true, __elapsed}; | |
3242 | __elapsed -= __pos[-1].value(); | |
3243 | } | |
3244 | } | |
3245 | return {false, __elapsed}; | |
3246 | } | |
3247 | else | |
3248 | #endif | |
3249 | { | |
3250 | seconds::rep __s = __ss.time_since_epoch().count(); | |
3251 | const seconds::rep* __first = std::begin(__leaps); | |
3252 | const seconds::rep* __last = std::end(__leaps); | |
3253 | ||
3254 | // Don't bother searching the list if we're after the last one. | |
3255 | if (__s > (__last[-1] + (__last - __first) + 1)) | |
3256 | return { false, seconds(__last - __first) }; | |
3257 | ||
3258 | auto __pos = std::upper_bound(__first, __last, __s); | |
3259 | seconds __elapsed{__pos - __first}; | |
3260 | if (__is_utc) | |
3261 | { | |
3262 | // Convert utc_time to sys_time: | |
3263 | __s -= __elapsed.count(); | |
3264 | // See if that sys_time is before (or during) previous leap sec: | |
3265 | if (__pos != __first && __s < __pos[-1]) | |
3266 | { | |
3267 | if ((__s + 1) >= __pos[-1]) | |
3268 | return {true, __elapsed}; | |
3269 | --__elapsed; | |
3270 | } | |
3271 | } | |
3272 | return {false, __elapsed}; | |
3273 | } | |
3274 | } | |
3275 | } // namespace __detail | |
3276 | ||
3277 | template<typename _Duration> | |
3278 | [[nodiscard]] | |
3279 | inline leap_second_info | |
3280 | get_leap_second_info(const utc_time<_Duration>& __ut) | |
3281 | { | |
3282 | auto __s = chrono::duration_cast<seconds>(__ut.time_since_epoch()); | |
3283 | return __detail::__get_leap_second_info(sys_seconds(__s), true); | |
3284 | } | |
3285 | ||
3286 | template<typename _Duration> | |
3287 | [[nodiscard]] | |
3288 | inline utc_time<common_type_t<_Duration, seconds>> | |
3289 | utc_clock::from_sys(const sys_time<_Duration>& __t) | |
3290 | { | |
3291 | using _CDur = common_type_t<_Duration, seconds>; | |
3292 | auto __s = chrono::time_point_cast<seconds>(__t); | |
3293 | const auto __li = __detail::__get_leap_second_info(__s, false); | |
3294 | return utc_time<_CDur>{__t.time_since_epoch()} + __li.elapsed; | |
3295 | } | |
3296 | ||
3297 | /// @} group chrono | |
3298 | #endif // C++20 | |
3299 | } // namespace chrono | |
3300 | ||
3301 | #if __cplusplus >= 202002L | |
3302 | inline namespace literals | |
3303 | { | |
3304 | inline namespace chrono_literals | |
3305 | { | |
3306 | /// @addtogroup chrono | |
3307 | /// @{ | |
3308 | #pragma GCC diagnostic push | |
3309 | #pragma GCC diagnostic ignored "-Wliteral-suffix" | |
3310 | /// Literal suffix for creating chrono::day objects. | |
3311 | /// @since C++20 | |
3312 | constexpr chrono::day | |
3313 | operator""d(unsigned long long __d) noexcept | |
3314 | { return chrono::day{static_cast<unsigned>(__d)}; } | |
3315 | ||
3316 | /// Literal suffix for creating chrono::year objects. | |
3317 | /// @since C++20 | |
3318 | constexpr chrono::year | |
3319 | operator""y(unsigned long long __y) noexcept | |
3320 | { return chrono::year{static_cast<int>(__y)}; } | |
3321 | #pragma GCC diagnostic pop | |
3322 | /// @} | |
3323 | } // inline namespace chrono_literals | |
3324 | } // inline namespace literals | |
3325 | #endif // C++20 | |
3326 | ||
3327 | _GLIBCXX_END_NAMESPACE_VERSION | |
3328 | } // namespace std | |
3329 | ||
3330 | #if __cplusplus >= 202002L | |
3331 | # include <bits/chrono_io.h> | |
3332 | #endif | |
3333 | ||
3334 | #endif // C++11 | |
3335 | ||
3336 | #endif //_GLIBCXX_CHRONO |