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15e38d0d CF |
1 | // <chrono> -*- C++ -*- |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2008-2023 Free Software Foundation, Inc. |
15e38d0d CF |
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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
15e38d0d CF |
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 | ||
748086b7 JJ |
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. | |
15e38d0d | 19 | |
748086b7 JJ |
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/>. | |
15e38d0d CF |
24 | |
25 | /** @file include/chrono | |
26 | * This is a Standard C++ Library header. | |
c34d3fd3 | 27 | * @ingroup chrono |
15e38d0d CF |
28 | */ |
29 | ||
30 | #ifndef _GLIBCXX_CHRONO | |
31 | #define _GLIBCXX_CHRONO 1 | |
32 | ||
33 | #pragma GCC system_header | |
34 | ||
18f176d0 AA |
35 | #include <bits/requires_hosted.h> // for <ctime> and clocks |
36 | ||
734f5023 | 37 | #if __cplusplus < 201103L |
ab65a4c7 | 38 | # include <bits/c++0x_warning.h> |
15e38d0d CF |
39 | #else |
40 | ||
7f78718b | 41 | #include <bits/chrono.h> |
1736bf5a JW |
42 | |
43 | #if __cplusplus >= 202002L | |
5329e1a8 | 44 | # include <bit> |
1736bf5a JW |
45 | # include <sstream> |
46 | # include <string> | |
47 | # include <vector> | |
9fc61d45 | 48 | # include <bits/stl_algo.h> // upper_bound |
1736bf5a JW |
49 | # include <bits/shared_ptr.h> |
50 | # include <bits/unique_ptr.h> | |
fcc13d6f | 51 | #endif |
15e38d0d | 52 | |
9fc61d45 JW |
53 | #if __cplusplus >= 202002L |
54 | // TODO formatting and parsing | |
55 | // # undef __cpp_lib_chrono | |
56 | // # define __cpp_lib_chrono 201907L | |
57 | #endif | |
58 | ||
12ffa228 BK |
59 | namespace std _GLIBCXX_VISIBILITY(default) |
60 | { | |
4a15d842 FD |
61 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
62 | ||
5b9daa7e BK |
63 | /** |
64 | * @defgroup chrono Time | |
65 | * @ingroup utilities | |
66 | * | |
67 | * Classes and functions for time. | |
f2ce64b5 JW |
68 | * |
69 | * @since C++11 | |
5b9daa7e BK |
70 | */ |
71 | ||
72 | /** @namespace std::chrono | |
19aaf814 | 73 | * @brief ISO C++ 2011 namespace for date and time utilities |
f2ce64b5 | 74 | * @ingroup chrono |
5b9daa7e | 75 | */ |
15e38d0d CF |
76 | namespace chrono |
77 | { | |
7f78718b | 78 | #if __cplusplus >= 202002L |
f2ce64b5 JW |
79 | /// @addtogroup chrono |
80 | /// @{ | |
16948c54 JW |
81 | struct local_t { }; |
82 | template<typename _Duration> | |
83 | using local_time = time_point<local_t, _Duration>; | |
84 | using local_seconds = local_time<seconds>; | |
85 | using local_days = local_time<days>; | |
bf1fc37b | 86 | |
03d5044b PP |
87 | class utc_clock; |
88 | class tai_clock; | |
89 | class gps_clock; | |
5b9daa7e | 90 | |
03d5044b PP |
91 | template<typename _Duration> |
92 | using utc_time = time_point<utc_clock, _Duration>; | |
93 | using utc_seconds = utc_time<seconds>; | |
15e38d0d | 94 | |
03d5044b PP |
95 | template<typename _Duration> |
96 | using tai_time = time_point<tai_clock, _Duration>; | |
97 | using tai_seconds = tai_time<seconds>; | |
a15f7cb8 | 98 | |
03d5044b PP |
99 | template<typename _Duration> |
100 | using gps_time = time_point<gps_clock, _Duration>; | |
101 | using gps_seconds = gps_time<seconds>; | |
102 | ||
103 | template<> struct is_clock<utc_clock> : true_type { }; | |
104 | template<> struct is_clock<tai_clock> : true_type { }; | |
105 | template<> struct is_clock<gps_clock> : true_type { }; | |
106 | ||
107 | template<> inline constexpr bool is_clock_v<utc_clock> = true; | |
108 | template<> inline constexpr bool is_clock_v<tai_clock> = true; | |
109 | template<> inline constexpr bool is_clock_v<gps_clock> = true; | |
110 | ||
111 | struct leap_second_info | |
112 | { | |
113 | bool is_leap_second; | |
114 | seconds elapsed; | |
115 | }; | |
116 | ||
1736bf5a JW |
117 | template<typename _Duration> |
118 | leap_second_info | |
119 | get_leap_second_info(const utc_time<_Duration>& __ut); | |
120 | ||
121 | /** A clock that measures Universal Coordinated Time (UTC). | |
122 | * | |
123 | * The epoch is 1970-01-01 00:00:00. | |
124 | * | |
125 | * @since C++20 | |
126 | */ | |
127 | class utc_clock | |
128 | { | |
129 | public: | |
130 | using rep = system_clock::rep; | |
131 | using period = system_clock::period; | |
132 | using duration = chrono::duration<rep, period>; | |
133 | using time_point = chrono::time_point<utc_clock>; | |
134 | static constexpr bool is_steady = false; | |
135 | ||
ec8f914f | 136 | [[nodiscard]] |
1736bf5a JW |
137 | static time_point |
138 | now() | |
139 | { return from_sys(system_clock::now()); } | |
140 | ||
141 | template<typename _Duration> | |
ec8f914f | 142 | [[nodiscard]] |
1736bf5a JW |
143 | static sys_time<common_type_t<_Duration, seconds>> |
144 | to_sys(const utc_time<_Duration>& __t) | |
145 | { | |
146 | using _CDur = common_type_t<_Duration, seconds>; | |
147 | const auto __li = chrono::get_leap_second_info(__t); | |
9fc61d45 | 148 | sys_time<_CDur> __s{__t.time_since_epoch() - __li.elapsed}; |
1736bf5a JW |
149 | if (__li.is_leap_second) |
150 | __s = chrono::floor<seconds>(__s) + seconds{1} - _CDur{1}; | |
151 | return __s; | |
152 | } | |
153 | ||
154 | template<typename _Duration> | |
ec8f914f | 155 | [[nodiscard]] |
1736bf5a | 156 | static utc_time<common_type_t<_Duration, seconds>> |
9fc61d45 | 157 | from_sys(const sys_time<_Duration>& __t); |
1736bf5a JW |
158 | }; |
159 | ||
160 | /** A clock that measures International Atomic Time. | |
161 | * | |
162 | * The epoch is 1958-01-01 00:00:00. | |
163 | * | |
164 | * @since C++20 | |
165 | */ | |
166 | class tai_clock | |
167 | { | |
168 | public: | |
169 | using rep = system_clock::rep; | |
170 | using period = system_clock::period; | |
171 | using duration = chrono::duration<rep, period>; | |
172 | using time_point = chrono::time_point<tai_clock>; | |
173 | static constexpr bool is_steady = false; // XXX true for CLOCK_TAI? | |
174 | ||
175 | // TODO move into lib, use CLOCK_TAI on linux, add extension point. | |
ec8f914f | 176 | [[nodiscard]] |
1736bf5a JW |
177 | static time_point |
178 | now() | |
179 | { return from_utc(utc_clock::now()); } | |
180 | ||
181 | template<typename _Duration> | |
ec8f914f | 182 | [[nodiscard]] |
1736bf5a JW |
183 | static utc_time<common_type_t<_Duration, seconds>> |
184 | to_utc(const tai_time<_Duration>& __t) | |
185 | { | |
186 | using _CDur = common_type_t<_Duration, seconds>; | |
187 | return utc_time<_CDur>{__t.time_since_epoch()} - 378691210s; | |
188 | } | |
189 | ||
190 | template<typename _Duration> | |
ec8f914f | 191 | [[nodiscard]] |
1736bf5a JW |
192 | static tai_time<common_type_t<_Duration, seconds>> |
193 | from_utc(const utc_time<_Duration>& __t) | |
194 | { | |
195 | using _CDur = common_type_t<_Duration, seconds>; | |
196 | return tai_time<_CDur>{__t.time_since_epoch()} + 378691210s; | |
197 | } | |
198 | }; | |
199 | ||
200 | /** A clock that measures GPS time. | |
201 | * | |
202 | * The epoch is 1980-01-06 00:00:00. | |
203 | * | |
204 | * @since C++20 | |
205 | */ | |
206 | class gps_clock | |
207 | { | |
208 | public: | |
209 | using rep = system_clock::rep; | |
210 | using period = system_clock::period; | |
211 | using duration = chrono::duration<rep, period>; | |
212 | using time_point = chrono::time_point<gps_clock>; | |
213 | static constexpr bool is_steady = false; // XXX | |
214 | ||
215 | // TODO move into lib, add extension point. | |
ec8f914f | 216 | [[nodiscard]] |
1736bf5a JW |
217 | static time_point |
218 | now() | |
219 | { return from_utc(utc_clock::now()); } | |
220 | ||
221 | template<typename _Duration> | |
ec8f914f | 222 | [[nodiscard]] |
1736bf5a JW |
223 | static utc_time<common_type_t<_Duration, seconds>> |
224 | to_utc(const gps_time<_Duration>& __t) | |
225 | { | |
226 | using _CDur = common_type_t<_Duration, seconds>; | |
227 | return utc_time<_CDur>{__t.time_since_epoch()} + 315964809s; | |
228 | } | |
229 | ||
230 | template<typename _Duration> | |
ec8f914f | 231 | [[nodiscard]] |
1736bf5a JW |
232 | static gps_time<common_type_t<_Duration, seconds>> |
233 | from_utc(const utc_time<_Duration>& __t) | |
234 | { | |
235 | using _CDur = common_type_t<_Duration, seconds>; | |
236 | return gps_time<_CDur>{__t.time_since_epoch()} - 315964809s; | |
237 | } | |
238 | }; | |
239 | ||
240 | ||
241 | template<typename _DestClock, typename _SourceClock> | |
242 | struct clock_time_conversion | |
243 | { }; | |
244 | ||
245 | // Identity conversions | |
246 | ||
247 | template<typename _Clock> | |
248 | struct clock_time_conversion<_Clock, _Clock> | |
249 | { | |
250 | template<typename _Duration> | |
251 | time_point<_Clock, _Duration> | |
252 | operator()(const time_point<_Clock, _Duration>& __t) const | |
253 | { return __t; } | |
254 | }; | |
255 | ||
256 | template<> | |
257 | struct clock_time_conversion<system_clock, system_clock> | |
258 | { | |
259 | template<typename _Duration> | |
260 | sys_time<_Duration> | |
261 | operator()(const sys_time<_Duration>& __t) const | |
262 | { return __t; } | |
263 | }; | |
264 | ||
265 | template<> | |
266 | struct clock_time_conversion<utc_clock, utc_clock> | |
267 | { | |
268 | template<typename _Duration> | |
269 | utc_time<_Duration> | |
270 | operator()(const utc_time<_Duration>& __t) const | |
271 | { return __t; } | |
272 | }; | |
273 | ||
274 | // Conversions between system_clock and utc_clock | |
275 | ||
276 | template<> | |
277 | struct clock_time_conversion<utc_clock, system_clock> | |
278 | { | |
279 | template<typename _Duration> | |
280 | utc_time<common_type_t<_Duration, seconds>> | |
281 | operator()(const sys_time<_Duration>& __t) const | |
282 | { return utc_clock::from_sys(__t); } | |
283 | }; | |
284 | ||
285 | template<> | |
286 | struct clock_time_conversion<system_clock, utc_clock> | |
287 | { | |
288 | template<typename _Duration> | |
289 | sys_time<common_type_t<_Duration, seconds>> | |
290 | operator()(const utc_time<_Duration>& __t) const | |
291 | { return utc_clock::to_sys(__t); } | |
292 | }; | |
293 | ||
294 | template<typename _Tp, typename _Clock> | |
295 | inline constexpr bool __is_time_point_for_v = false; | |
296 | ||
297 | template<typename _Clock, typename _Duration> | |
298 | inline constexpr bool | |
299 | __is_time_point_for_v<time_point<_Clock, _Duration>, _Clock> = true; | |
300 | ||
301 | // Conversions between system_clock and other clocks | |
302 | ||
303 | template<typename _SourceClock> | |
304 | struct clock_time_conversion<system_clock, _SourceClock> | |
305 | { | |
306 | template<typename _Duration, typename _Src = _SourceClock> | |
307 | auto | |
308 | operator()(const time_point<_SourceClock, _Duration>& __t) const | |
309 | -> decltype(_Src::to_sys(__t)) | |
310 | { | |
311 | using _Ret = decltype(_SourceClock::to_sys(__t)); | |
312 | static_assert(__is_time_point_for_v<_Ret, system_clock>); | |
313 | return _SourceClock::to_sys(__t); | |
314 | } | |
315 | }; | |
316 | ||
317 | template<typename _DestClock> | |
318 | struct clock_time_conversion<_DestClock, system_clock> | |
319 | { | |
320 | template<typename _Duration, typename _Dest = _DestClock> | |
321 | auto | |
322 | operator()(const sys_time<_Duration>& __t) const | |
323 | -> decltype(_Dest::from_sys(__t)) | |
324 | { | |
325 | using _Ret = decltype(_DestClock::from_sys(__t)); | |
326 | static_assert(__is_time_point_for_v<_Ret, _DestClock>); | |
327 | return _DestClock::from_sys(__t); | |
328 | } | |
329 | }; | |
330 | ||
331 | // Conversions between utc_clock and other clocks | |
332 | ||
333 | template<typename _SourceClock> | |
334 | struct clock_time_conversion<utc_clock, _SourceClock> | |
335 | { | |
336 | template<typename _Duration, typename _Src = _SourceClock> | |
337 | auto | |
338 | operator()(const time_point<_SourceClock, _Duration>& __t) const | |
339 | -> decltype(_Src::to_utc(__t)) | |
340 | { | |
341 | using _Ret = decltype(_SourceClock::to_utc(__t)); | |
342 | static_assert(__is_time_point_for_v<_Ret, utc_clock>); | |
343 | return _SourceClock::to_utc(__t); | |
344 | } | |
345 | }; | |
346 | ||
347 | template<typename _DestClock> | |
348 | struct clock_time_conversion<_DestClock, utc_clock> | |
349 | { | |
350 | template<typename _Duration, typename _Dest = _DestClock> | |
351 | auto | |
352 | operator()(const utc_time<_Duration>& __t) const | |
353 | -> decltype(_Dest::from_utc(__t)) | |
354 | { | |
355 | using _Ret = decltype(_DestClock::from_utc(__t)); | |
356 | static_assert(__is_time_point_for_v<_Ret, _DestClock>); | |
357 | return _DestClock::from_utc(__t); | |
358 | } | |
359 | }; | |
360 | ||
361 | /// @cond undocumented | |
362 | namespace __detail | |
363 | { | |
364 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
365 | concept __clock_convs | |
366 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
367 | clock_time_conversion<_DestClock, _SourceClock>{}(__t); | |
368 | }; | |
369 | ||
370 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
371 | concept __clock_convs_sys | |
372 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
373 | clock_time_conversion<_DestClock, system_clock>{}( | |
374 | clock_time_conversion<system_clock, _SourceClock>{}(__t)); | |
375 | }; | |
376 | ||
377 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
378 | concept __clock_convs_utc | |
379 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
380 | clock_time_conversion<_DestClock, utc_clock>{}( | |
381 | clock_time_conversion<utc_clock, _SourceClock>{}(__t)); | |
382 | }; | |
383 | ||
384 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
385 | concept __clock_convs_sys_utc | |
386 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
387 | clock_time_conversion<_DestClock, utc_clock>{}( | |
388 | clock_time_conversion<utc_clock, system_clock>{}( | |
389 | clock_time_conversion<system_clock, _SourceClock>{}(__t))); | |
390 | }; | |
391 | ||
392 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
393 | concept __clock_convs_utc_sys | |
394 | = requires (const time_point<_SourceClock, _Duration>& __t) { | |
395 | clock_time_conversion<_DestClock, system_clock>{}( | |
396 | clock_time_conversion<system_clock, utc_clock>{}( | |
397 | clock_time_conversion<utc_clock, _SourceClock>{}(__t))); | |
398 | }; | |
399 | ||
400 | } // namespace __detail | |
401 | /// @endcond | |
402 | ||
403 | /// Convert a time point to a different clock. | |
404 | template<typename _DestClock, typename _SourceClock, typename _Duration> | |
ec8f914f | 405 | [[nodiscard]] |
1736bf5a JW |
406 | inline auto |
407 | clock_cast(const time_point<_SourceClock, _Duration>& __t) | |
408 | requires __detail::__clock_convs<_DestClock, _SourceClock, _Duration> | |
409 | || __detail::__clock_convs_sys<_DestClock, _SourceClock, _Duration> | |
410 | || __detail::__clock_convs_utc<_DestClock, _SourceClock, _Duration> | |
411 | || __detail::__clock_convs_sys_utc<_DestClock, _SourceClock, _Duration> | |
412 | || __detail::__clock_convs_utc_sys<_DestClock, _SourceClock, _Duration> | |
413 | { | |
414 | constexpr bool __direct | |
415 | = __detail::__clock_convs<_DestClock, _SourceClock, _Duration>; | |
416 | if constexpr (__direct) | |
417 | { | |
418 | return clock_time_conversion<_DestClock, _SourceClock>{}(__t); | |
419 | } | |
420 | else | |
421 | { | |
422 | constexpr bool __convert_via_sys_clock | |
423 | = __detail::__clock_convs_sys<_DestClock, _SourceClock, _Duration>; | |
424 | constexpr bool __convert_via_utc_clock | |
425 | = __detail::__clock_convs_utc<_DestClock, _SourceClock, _Duration>; | |
426 | if constexpr (__convert_via_sys_clock) | |
427 | { | |
428 | static_assert(!__convert_via_utc_clock, | |
429 | "clock_cast requires a unique best conversion, but " | |
430 | "conversion is possible via system_clock and also via" | |
431 | "utc_clock"); | |
432 | return clock_time_conversion<_DestClock, system_clock>{}( | |
433 | clock_time_conversion<system_clock, _SourceClock>{}(__t)); | |
434 | } | |
435 | else if constexpr (__convert_via_utc_clock) | |
436 | { | |
437 | return clock_time_conversion<_DestClock, utc_clock>{}( | |
438 | clock_time_conversion<utc_clock, _SourceClock>{}(__t)); | |
439 | } | |
440 | else | |
441 | { | |
442 | constexpr bool __convert_via_sys_and_utc_clocks | |
443 | = __detail::__clock_convs_sys_utc<_DestClock, | |
444 | _SourceClock, | |
445 | _Duration>; | |
446 | ||
447 | if constexpr (__convert_via_sys_and_utc_clocks) | |
448 | { | |
449 | constexpr bool __convert_via_utc_and_sys_clocks | |
450 | = __detail::__clock_convs_utc_sys<_DestClock, | |
451 | _SourceClock, | |
452 | _Duration>; | |
453 | static_assert(!__convert_via_utc_and_sys_clocks, | |
454 | "clock_cast requires a unique best conversion, but " | |
455 | "conversion is possible via system_clock followed by " | |
456 | "utc_clock, and also via utc_clock followed by " | |
457 | "system_clock"); | |
458 | return clock_time_conversion<_DestClock, utc_clock>{}( | |
459 | clock_time_conversion<utc_clock, system_clock>{}( | |
460 | clock_time_conversion<system_clock, _SourceClock>{}(__t))); | |
461 | } | |
462 | else | |
463 | { | |
464 | return clock_time_conversion<_DestClock, system_clock>{}( | |
465 | clock_time_conversion<system_clock, utc_clock>{}( | |
466 | clock_time_conversion<utc_clock, _SourceClock>{}(__t))); | |
467 | } | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
03d5044b PP |
472 | // CALENDRICAL TYPES |
473 | ||
474 | // CLASS DECLARATIONS | |
475 | class day; | |
476 | class month; | |
477 | class year; | |
478 | class weekday; | |
479 | class weekday_indexed; | |
480 | class weekday_last; | |
481 | class month_day; | |
482 | class month_day_last; | |
483 | class month_weekday; | |
484 | class month_weekday_last; | |
485 | class year_month; | |
486 | class year_month_day; | |
487 | class year_month_day_last; | |
488 | class year_month_weekday; | |
489 | class year_month_weekday_last; | |
490 | ||
491 | struct last_spec | |
492 | { | |
493 | explicit last_spec() = default; | |
494 | ||
495 | friend constexpr month_day_last | |
496 | operator/(int __m, last_spec) noexcept; | |
497 | ||
498 | friend constexpr month_day_last | |
499 | operator/(last_spec, int __m) noexcept; | |
500 | }; | |
501 | ||
502 | inline constexpr last_spec last{}; | |
503 | ||
504 | namespace __detail | |
505 | { | |
506 | // Compute the remainder of the Euclidean division of __n divided by __d. | |
507 | // Euclidean division truncates toward negative infinity and always | |
508 | // produces a remainder in the range of [0,__d-1] (whereas standard | |
509 | // division truncates toward zero and yields a nonpositive remainder | |
510 | // for negative __n). | |
511 | constexpr unsigned | |
512 | __modulo(long long __n, unsigned __d) | |
cd1464db | 513 | { |
03d5044b PP |
514 | if (__n >= 0) |
515 | return __n % __d; | |
516 | else | |
517 | return (__d + (__n % __d)) % __d; | |
cd1464db | 518 | } |
1c9f675f | 519 | |
03d5044b PP |
520 | inline constexpr unsigned __days_per_month[12] |
521 | = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; | |
03d5044b | 522 | } |
88c4d6b7 | 523 | |
03d5044b | 524 | // DAY |
1c9f675f | 525 | |
03d5044b PP |
526 | class day |
527 | { | |
528 | private: | |
529 | unsigned char _M_d; | |
1c9f675f | 530 | |
03d5044b PP |
531 | public: |
532 | day() = default; | |
1c9f675f | 533 | |
03d5044b PP |
534 | explicit constexpr |
535 | day(unsigned __d) noexcept | |
536 | : _M_d(__d) | |
537 | { } | |
1c9f675f | 538 | |
03d5044b PP |
539 | constexpr day& |
540 | operator++() noexcept | |
541 | { | |
542 | ++_M_d; | |
543 | return *this; | |
544 | } | |
1c9f675f | 545 | |
03d5044b PP |
546 | constexpr day |
547 | operator++(int) noexcept | |
548 | { | |
549 | auto __ret = *this; | |
550 | ++(*this); | |
551 | return __ret; | |
552 | } | |
1c9f675f | 553 | |
03d5044b PP |
554 | constexpr day& |
555 | operator--() noexcept | |
556 | { | |
557 | --_M_d; | |
558 | return *this; | |
559 | } | |
1c9f675f | 560 | |
03d5044b PP |
561 | constexpr day |
562 | operator--(int) noexcept | |
563 | { | |
564 | auto __ret = *this; | |
565 | --(*this); | |
566 | return __ret; | |
567 | } | |
88c4d6b7 | 568 | |
03d5044b PP |
569 | constexpr day& |
570 | operator+=(const days& __d) noexcept | |
571 | { | |
572 | *this = *this + __d; | |
573 | return *this; | |
574 | } | |
88c4d6b7 | 575 | |
03d5044b PP |
576 | constexpr day& |
577 | operator-=(const days& __d) noexcept | |
578 | { | |
579 | *this = *this - __d; | |
580 | return *this; | |
581 | } | |
88c4d6b7 | 582 | |
03d5044b PP |
583 | constexpr explicit |
584 | operator unsigned() const noexcept | |
585 | { return _M_d; } | |
88c4d6b7 | 586 | |
03d5044b PP |
587 | constexpr bool |
588 | ok() const noexcept | |
589 | { return 1 <= _M_d && _M_d <= 31; } | |
590 | ||
591 | friend constexpr bool | |
592 | operator==(const day& __x, const day& __y) noexcept | |
593 | { return unsigned{__x} == unsigned{__y}; } | |
594 | ||
595 | friend constexpr strong_ordering | |
596 | operator<=>(const day& __x, const day& __y) noexcept | |
597 | { return unsigned{__x} <=> unsigned{__y}; } | |
598 | ||
599 | friend constexpr day | |
600 | operator+(const day& __x, const days& __y) noexcept | |
601 | { return day(unsigned{__x} + __y.count()); } | |
602 | ||
603 | friend constexpr day | |
604 | operator+(const days& __x, const day& __y) noexcept | |
605 | { return __y + __x; } | |
606 | ||
607 | friend constexpr day | |
608 | operator-(const day& __x, const days& __y) noexcept | |
609 | { return __x + -__y; } | |
610 | ||
611 | friend constexpr days | |
612 | operator-(const day& __x, const day& __y) noexcept | |
613 | { return days{int(unsigned{__x}) - int(unsigned{__y})}; } | |
614 | ||
615 | friend constexpr month_day | |
616 | operator/(const month& __m, const day& __d) noexcept; | |
617 | ||
618 | friend constexpr month_day | |
619 | operator/(int __m, const day& __d) noexcept; | |
620 | ||
621 | friend constexpr month_day | |
622 | operator/(const day& __d, const month& __m) noexcept; | |
623 | ||
624 | friend constexpr month_day | |
625 | operator/(const day& __d, int __m) noexcept; | |
626 | ||
627 | friend constexpr year_month_day | |
628 | operator/(const year_month& __ym, const day& __d) noexcept; | |
03d5044b PP |
629 | }; |
630 | ||
631 | // MONTH | |
632 | ||
633 | class month | |
634 | { | |
635 | private: | |
636 | unsigned char _M_m; | |
637 | ||
638 | public: | |
639 | month() = default; | |
640 | ||
641 | explicit constexpr | |
642 | month(unsigned __m) noexcept | |
643 | : _M_m(__m) | |
644 | { } | |
645 | ||
646 | constexpr month& | |
647 | operator++() noexcept | |
648 | { | |
649 | *this += months{1}; | |
650 | return *this; | |
651 | } | |
652 | ||
653 | constexpr month | |
654 | operator++(int) noexcept | |
655 | { | |
656 | auto __ret = *this; | |
657 | ++(*this); | |
658 | return __ret; | |
659 | } | |
660 | ||
661 | constexpr month& | |
662 | operator--() noexcept | |
663 | { | |
664 | *this -= months{1}; | |
665 | return *this; | |
666 | } | |
667 | ||
668 | constexpr month | |
669 | operator--(int) noexcept | |
670 | { | |
671 | auto __ret = *this; | |
672 | --(*this); | |
673 | return __ret; | |
674 | } | |
675 | ||
676 | constexpr month& | |
677 | operator+=(const months& __m) noexcept | |
678 | { | |
679 | *this = *this + __m; | |
680 | return *this; | |
681 | } | |
682 | ||
683 | constexpr month& | |
684 | operator-=(const months& __m) noexcept | |
685 | { | |
686 | *this = *this - __m; | |
687 | return *this; | |
688 | } | |
689 | ||
690 | explicit constexpr | |
691 | operator unsigned() const noexcept | |
692 | { return _M_m; } | |
693 | ||
694 | constexpr bool | |
695 | ok() const noexcept | |
696 | { return 1 <= _M_m && _M_m <= 12; } | |
697 | ||
698 | friend constexpr bool | |
699 | operator==(const month& __x, const month& __y) noexcept | |
700 | { return unsigned{__x} == unsigned{__y}; } | |
701 | ||
702 | friend constexpr strong_ordering | |
703 | operator<=>(const month& __x, const month& __y) noexcept | |
704 | { return unsigned{__x} <=> unsigned{__y}; } | |
705 | ||
706 | friend constexpr month | |
707 | operator+(const month& __x, const months& __y) noexcept | |
708 | { | |
709 | auto __n = static_cast<long long>(unsigned{__x}) + (__y.count() - 1); | |
710 | return month{__detail::__modulo(__n, 12) + 1}; | |
711 | } | |
712 | ||
713 | friend constexpr month | |
714 | operator+(const months& __x, const month& __y) noexcept | |
715 | { return __y + __x; } | |
716 | ||
717 | friend constexpr month | |
718 | operator-(const month& __x, const months& __y) noexcept | |
719 | { return __x + -__y; } | |
720 | ||
721 | friend constexpr months | |
722 | operator-(const month& __x, const month& __y) noexcept | |
723 | { | |
724 | const auto __dm = int(unsigned(__x)) - int(unsigned(__y)); | |
725 | return months{__dm < 0 ? 12 + __dm : __dm}; | |
726 | } | |
727 | ||
728 | friend constexpr year_month | |
729 | operator/(const year& __y, const month& __m) noexcept; | |
730 | ||
731 | friend constexpr month_day | |
732 | operator/(const month& __m, int __d) noexcept; | |
733 | ||
734 | friend constexpr month_day_last | |
735 | operator/(const month& __m, last_spec) noexcept; | |
736 | ||
737 | friend constexpr month_day_last | |
738 | operator/(last_spec, const month& __m) noexcept; | |
739 | ||
740 | friend constexpr month_weekday | |
741 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; | |
742 | ||
743 | friend constexpr month_weekday | |
744 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; | |
745 | ||
746 | friend constexpr month_weekday_last | |
747 | operator/(const month& __m, const weekday_last& __wdl) noexcept; | |
748 | ||
749 | friend constexpr month_weekday_last | |
750 | operator/(const weekday_last& __wdl, const month& __m) noexcept; | |
03d5044b PP |
751 | }; |
752 | ||
753 | inline constexpr month January{1}; | |
754 | inline constexpr month February{2}; | |
755 | inline constexpr month March{3}; | |
756 | inline constexpr month April{4}; | |
757 | inline constexpr month May{5}; | |
758 | inline constexpr month June{6}; | |
759 | inline constexpr month July{7}; | |
760 | inline constexpr month August{8}; | |
761 | inline constexpr month September{9}; | |
762 | inline constexpr month October{10}; | |
763 | inline constexpr month November{11}; | |
764 | inline constexpr month December{12}; | |
765 | ||
766 | // YEAR | |
767 | ||
768 | class year | |
769 | { | |
770 | private: | |
771 | short _M_y; | |
772 | ||
773 | public: | |
774 | year() = default; | |
775 | ||
776 | explicit constexpr | |
777 | year(int __y) noexcept | |
778 | : _M_y{static_cast<short>(__y)} | |
779 | { } | |
780 | ||
781 | static constexpr year | |
782 | min() noexcept | |
783 | { return year{-32767}; } | |
784 | ||
785 | static constexpr year | |
786 | max() noexcept | |
787 | { return year{32767}; } | |
788 | ||
789 | constexpr year& | |
790 | operator++() noexcept | |
791 | { | |
792 | ++_M_y; | |
793 | return *this; | |
794 | } | |
795 | ||
796 | constexpr year | |
797 | operator++(int) noexcept | |
798 | { | |
799 | auto __ret = *this; | |
800 | ++(*this); | |
801 | return __ret; | |
802 | } | |
803 | ||
804 | constexpr year& | |
805 | operator--() noexcept | |
806 | { | |
807 | --_M_y; | |
808 | return *this; | |
809 | } | |
810 | ||
811 | constexpr year | |
812 | operator--(int) noexcept | |
813 | { | |
814 | auto __ret = *this; | |
815 | --(*this); | |
816 | return __ret; | |
817 | } | |
818 | ||
819 | constexpr year& | |
820 | operator+=(const years& __y) noexcept | |
821 | { | |
822 | *this = *this + __y; | |
823 | return *this; | |
824 | } | |
825 | ||
826 | constexpr year& | |
827 | operator-=(const years& __y) noexcept | |
828 | { | |
829 | *this = *this - __y; | |
830 | return *this; | |
831 | } | |
832 | ||
833 | constexpr year | |
834 | operator+() const noexcept | |
835 | { return *this; } | |
836 | ||
837 | constexpr year | |
838 | operator-() const noexcept | |
839 | { return year{-_M_y}; } | |
840 | ||
841 | constexpr bool | |
842 | is_leap() const noexcept | |
12679397 CN |
843 | { |
844 | // Testing divisibility by 100 first gives better performance, that is, | |
845 | // return (_M_y % 100 != 0 || _M_y % 400 == 0) && _M_y % 4 == 0; | |
846 | ||
847 | // It gets even faster if _M_y is in [-536870800, 536870999] | |
848 | // (which is the case here) and _M_y % 100 is replaced by | |
849 | // __is_multiple_of_100 below. | |
850 | ||
851 | // References: | |
852 | // [1] https://github.com/cassioneri/calendar | |
853 | // [2] https://accu.org/journals/overload/28/155/overload155.pdf#page=16 | |
854 | ||
4a404f66 JW |
855 | // Furthermore, if y%100 == 0, then y%400==0 is equivalent to y%16==0, |
856 | // so we can simplify it to (!mult_100 && y % 4 == 0) || y % 16 == 0, | |
b92d12d3 CN |
857 | // which is equivalent to (y & (mult_100 ? 15 : 3)) == 0. |
858 | // See https://gcc.gnu.org/pipermail/libstdc++/2021-June/052815.html | |
859 | ||
12679397 CN |
860 | constexpr uint32_t __multiplier = 42949673; |
861 | constexpr uint32_t __bound = 42949669; | |
862 | constexpr uint32_t __max_dividend = 1073741799; | |
863 | constexpr uint32_t __offset = __max_dividend / 2 / 100 * 100; | |
864 | const bool __is_multiple_of_100 | |
865 | = __multiplier * (_M_y + __offset) < __bound; | |
b92d12d3 | 866 | return (_M_y & (__is_multiple_of_100 ? 15 : 3)) == 0; |
12679397 | 867 | } |
03d5044b PP |
868 | |
869 | explicit constexpr | |
870 | operator int() const noexcept | |
871 | { return _M_y; } | |
872 | ||
873 | constexpr bool | |
874 | ok() const noexcept | |
875 | { return min()._M_y <= _M_y && _M_y <= max()._M_y; } | |
876 | ||
877 | friend constexpr bool | |
878 | operator==(const year& __x, const year& __y) noexcept | |
879 | { return int{__x} == int{__y}; } | |
880 | ||
881 | friend constexpr strong_ordering | |
882 | operator<=>(const year& __x, const year& __y) noexcept | |
883 | { return int{__x} <=> int{__y}; } | |
884 | ||
885 | friend constexpr year | |
886 | operator+(const year& __x, const years& __y) noexcept | |
b6b9fd4a | 887 | { return year{int{__x} + static_cast<int>(__y.count())}; } |
03d5044b PP |
888 | |
889 | friend constexpr year | |
890 | operator+(const years& __x, const year& __y) noexcept | |
891 | { return __y + __x; } | |
892 | ||
893 | friend constexpr year | |
894 | operator-(const year& __x, const years& __y) noexcept | |
895 | { return __x + -__y; } | |
896 | ||
897 | friend constexpr years | |
898 | operator-(const year& __x, const year& __y) noexcept | |
899 | { return years{int{__x} - int{__y}}; } | |
900 | ||
901 | friend constexpr year_month | |
902 | operator/(const year& __y, int __m) noexcept; | |
903 | ||
904 | friend constexpr year_month_day | |
905 | operator/(const year& __y, const month_day& __md) noexcept; | |
906 | ||
907 | friend constexpr year_month_day | |
908 | operator/(const month_day& __md, const year& __y) noexcept; | |
909 | ||
910 | friend constexpr year_month_day_last | |
911 | operator/(const year& __y, const month_day_last& __mdl) noexcept; | |
912 | ||
913 | friend constexpr year_month_day_last | |
914 | operator/(const month_day_last& __mdl, const year& __y) noexcept; | |
915 | ||
916 | friend constexpr year_month_weekday | |
917 | operator/(const year& __y, const month_weekday& __mwd) noexcept; | |
918 | ||
919 | friend constexpr year_month_weekday | |
920 | operator/(const month_weekday& __mwd, const year& __y) noexcept; | |
921 | ||
922 | friend constexpr year_month_weekday_last | |
923 | operator/(const year& __y, const month_weekday_last& __mwdl) noexcept; | |
924 | ||
925 | friend constexpr year_month_weekday_last | |
926 | operator/(const month_weekday_last& __mwdl, const year& __y) noexcept; | |
03d5044b PP |
927 | }; |
928 | ||
929 | // WEEKDAY | |
930 | ||
931 | class weekday | |
932 | { | |
933 | private: | |
934 | unsigned char _M_wd; | |
935 | ||
936 | static constexpr weekday | |
937 | _S_from_days(const days& __d) | |
938 | { | |
939 | auto __n = __d.count(); | |
940 | return weekday(__n >= -4 ? (__n + 4) % 7 : (__n + 5) % 7 + 6); | |
941 | } | |
942 | ||
943 | public: | |
944 | weekday() = default; | |
945 | ||
946 | explicit constexpr | |
947 | weekday(unsigned __wd) noexcept | |
948 | : _M_wd(__wd == 7 ? 0 : __wd) // __wd % 7 ? | |
949 | { } | |
950 | ||
951 | constexpr | |
952 | weekday(const sys_days& __dp) noexcept | |
953 | : weekday{_S_from_days(__dp.time_since_epoch())} | |
954 | { } | |
955 | ||
956 | explicit constexpr | |
957 | weekday(const local_days& __dp) noexcept | |
958 | : weekday{sys_days{__dp.time_since_epoch()}} | |
959 | { } | |
960 | ||
961 | constexpr weekday& | |
962 | operator++() noexcept | |
963 | { | |
964 | *this += days{1}; | |
965 | return *this; | |
966 | } | |
967 | ||
968 | constexpr weekday | |
969 | operator++(int) noexcept | |
970 | { | |
971 | auto __ret = *this; | |
972 | ++(*this); | |
973 | return __ret; | |
974 | } | |
975 | ||
976 | constexpr weekday& | |
977 | operator--() noexcept | |
978 | { | |
979 | *this -= days{1}; | |
980 | return *this; | |
981 | } | |
982 | ||
983 | constexpr weekday | |
984 | operator--(int) noexcept | |
985 | { | |
986 | auto __ret = *this; | |
987 | --(*this); | |
988 | return __ret; | |
989 | } | |
990 | ||
991 | constexpr weekday& | |
992 | operator+=(const days& __d) noexcept | |
993 | { | |
994 | *this = *this + __d; | |
995 | return *this; | |
996 | } | |
997 | ||
998 | constexpr weekday& | |
999 | operator-=(const days& __d) noexcept | |
1000 | { | |
1001 | *this = *this - __d; | |
1002 | return *this; | |
1003 | } | |
1004 | ||
1005 | constexpr unsigned | |
1006 | c_encoding() const noexcept | |
1007 | { return _M_wd; } | |
1008 | ||
1009 | constexpr unsigned | |
1010 | iso_encoding() const noexcept | |
1011 | { return _M_wd == 0u ? 7u : _M_wd; } | |
1012 | ||
1013 | constexpr bool | |
1014 | ok() const noexcept | |
1015 | { return _M_wd <= 6; } | |
1016 | ||
1017 | constexpr weekday_indexed | |
1018 | operator[](unsigned __index) const noexcept; | |
1019 | ||
1020 | constexpr weekday_last | |
1021 | operator[](last_spec) const noexcept; | |
1022 | ||
1023 | friend constexpr bool | |
1024 | operator==(const weekday& __x, const weekday& __y) noexcept | |
1025 | { return __x._M_wd == __y._M_wd; } | |
1026 | ||
1027 | friend constexpr weekday | |
1028 | operator+(const weekday& __x, const days& __y) noexcept | |
1029 | { | |
1030 | auto __n = static_cast<long long>(__x._M_wd) + __y.count(); | |
1031 | return weekday{__detail::__modulo(__n, 7)}; | |
1032 | } | |
1033 | ||
1034 | friend constexpr weekday | |
1035 | operator+(const days& __x, const weekday& __y) noexcept | |
1036 | { return __y + __x; } | |
1037 | ||
1038 | friend constexpr weekday | |
1039 | operator-(const weekday& __x, const days& __y) noexcept | |
1040 | { return __x + -__y; } | |
1041 | ||
1042 | friend constexpr days | |
1043 | operator-(const weekday& __x, const weekday& __y) noexcept | |
1044 | { | |
1045 | auto __n = static_cast<long long>(__x._M_wd) - __y._M_wd; | |
1046 | return days{__detail::__modulo(__n, 7)}; | |
1047 | } | |
03d5044b PP |
1048 | }; |
1049 | ||
1050 | inline constexpr weekday Sunday{0}; | |
1051 | inline constexpr weekday Monday{1}; | |
1052 | inline constexpr weekday Tuesday{2}; | |
1053 | inline constexpr weekday Wednesday{3}; | |
1054 | inline constexpr weekday Thursday{4}; | |
1055 | inline constexpr weekday Friday{5}; | |
1056 | inline constexpr weekday Saturday{6}; | |
1057 | ||
1058 | // WEEKDAY_INDEXED | |
1059 | ||
1060 | class weekday_indexed | |
1061 | { | |
1062 | private: | |
1063 | chrono::weekday _M_wd; | |
1064 | unsigned char _M_index; | |
1065 | ||
1066 | public: | |
1067 | weekday_indexed() = default; | |
1068 | ||
1069 | constexpr | |
1070 | weekday_indexed(const chrono::weekday& __wd, unsigned __index) noexcept | |
1071 | : _M_wd(__wd), _M_index(__index) | |
1072 | { } | |
1073 | ||
1074 | constexpr chrono::weekday | |
1075 | weekday() const noexcept | |
1076 | { return _M_wd; } | |
1077 | ||
1078 | constexpr unsigned | |
1079 | index() const noexcept | |
1080 | { return _M_index; }; | |
1081 | ||
1082 | constexpr bool | |
1083 | ok() const noexcept | |
1084 | { return _M_wd.ok() && 1 <= _M_index && _M_index <= 5; } | |
1085 | ||
1086 | friend constexpr bool | |
1087 | operator==(const weekday_indexed& __x, const weekday_indexed& __y) noexcept | |
1088 | { return __x.weekday() == __y.weekday() && __x.index() == __y.index(); } | |
1089 | ||
1090 | friend constexpr month_weekday | |
1091 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; | |
1092 | ||
1093 | friend constexpr month_weekday | |
1094 | operator/(int __m, const weekday_indexed& __wdi) noexcept; | |
1095 | ||
1096 | friend constexpr month_weekday | |
1097 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; | |
1098 | ||
1099 | friend constexpr month_weekday | |
1100 | operator/(const weekday_indexed& __wdi, int __m) noexcept; | |
1101 | ||
1102 | friend constexpr year_month_weekday | |
1103 | operator/(const year_month& __ym, const weekday_indexed& __wdi) noexcept; | |
03d5044b PP |
1104 | }; |
1105 | ||
1106 | constexpr weekday_indexed | |
1107 | weekday::operator[](unsigned __index) const noexcept | |
1108 | { return {*this, __index}; } | |
1109 | ||
1110 | // WEEKDAY_LAST | |
1111 | ||
1112 | class weekday_last | |
1113 | { | |
1114 | private: | |
1115 | chrono::weekday _M_wd; | |
1116 | ||
1117 | public: | |
1118 | explicit constexpr | |
1119 | weekday_last(const chrono::weekday& __wd) noexcept | |
1120 | : _M_wd{__wd} | |
1121 | { } | |
1122 | ||
1123 | constexpr chrono::weekday | |
1124 | weekday() const noexcept | |
1125 | { return _M_wd; } | |
1126 | ||
1127 | constexpr bool | |
1128 | ok() const noexcept | |
1129 | { return _M_wd.ok(); } | |
1130 | ||
1131 | friend constexpr bool | |
1132 | operator==(const weekday_last& __x, const weekday_last& __y) noexcept | |
1133 | { return __x.weekday() == __y.weekday(); } | |
1134 | ||
1135 | friend constexpr month_weekday_last | |
1136 | operator/(int __m, const weekday_last& __wdl) noexcept; | |
1137 | ||
1138 | friend constexpr month_weekday_last | |
1139 | operator/(const weekday_last& __wdl, int __m) noexcept; | |
1140 | ||
1141 | friend constexpr year_month_weekday_last | |
1142 | operator/(const year_month& __ym, const weekday_last& __wdl) noexcept; | |
03d5044b PP |
1143 | }; |
1144 | ||
1145 | constexpr weekday_last | |
1146 | weekday::operator[](last_spec) const noexcept | |
1147 | { return weekday_last{*this}; } | |
1148 | ||
1149 | // MONTH_DAY | |
1150 | ||
1151 | class month_day | |
1152 | { | |
1153 | private: | |
1154 | chrono::month _M_m; | |
1155 | chrono::day _M_d; | |
1156 | ||
1157 | public: | |
1158 | month_day() = default; | |
1159 | ||
1160 | constexpr | |
1161 | month_day(const chrono::month& __m, const chrono::day& __d) noexcept | |
1162 | : _M_m{__m}, _M_d{__d} | |
1163 | { } | |
1164 | ||
1165 | constexpr chrono::month | |
1166 | month() const noexcept | |
1167 | { return _M_m; } | |
1168 | ||
1169 | constexpr chrono::day | |
1170 | day() const noexcept | |
1171 | { return _M_d; } | |
1172 | ||
1173 | constexpr bool | |
1174 | ok() const noexcept | |
1175 | { | |
1176 | return _M_m.ok() | |
1177 | && 1u <= unsigned(_M_d) | |
1178 | && unsigned(_M_d) <= __detail::__days_per_month[unsigned(_M_m) - 1]; | |
1179 | } | |
1180 | ||
1181 | friend constexpr bool | |
1182 | operator==(const month_day& __x, const month_day& __y) noexcept | |
1183 | { return __x.month() == __y.month() && __x.day() == __y.day(); } | |
1184 | ||
1185 | friend constexpr strong_ordering | |
1186 | operator<=>(const month_day& __x, const month_day& __y) noexcept | |
1187 | = default; | |
1188 | ||
1189 | friend constexpr month_day | |
1190 | operator/(const chrono::month& __m, const chrono::day& __d) noexcept | |
1191 | { return {__m, __d}; } | |
1192 | ||
1193 | friend constexpr month_day | |
1194 | operator/(const chrono::month& __m, int __d) noexcept | |
1195 | { return {__m, chrono::day(unsigned(__d))}; } | |
1196 | ||
1197 | friend constexpr month_day | |
1198 | operator/(int __m, const chrono::day& __d) noexcept | |
1199 | { return {chrono::month(unsigned(__m)), __d}; } | |
1200 | ||
1201 | friend constexpr month_day | |
1202 | operator/(const chrono::day& __d, const chrono::month& __m) noexcept | |
1203 | { return {__m, __d}; } | |
1204 | ||
1205 | friend constexpr month_day | |
1206 | operator/(const chrono::day& __d, int __m) noexcept | |
1207 | { return {chrono::month(unsigned(__m)), __d}; } | |
1208 | ||
1209 | friend constexpr year_month_day | |
1210 | operator/(int __y, const month_day& __md) noexcept; | |
1211 | ||
1212 | friend constexpr year_month_day | |
1213 | operator/(const month_day& __md, int __y) noexcept; | |
03d5044b PP |
1214 | }; |
1215 | ||
1216 | // MONTH_DAY_LAST | |
1217 | ||
1218 | class month_day_last | |
1219 | { | |
1220 | private: | |
1221 | chrono::month _M_m; | |
1222 | ||
1223 | public: | |
1224 | explicit constexpr | |
1225 | month_day_last(const chrono::month& __m) noexcept | |
1226 | : _M_m{__m} | |
1227 | { } | |
1228 | ||
1229 | constexpr chrono::month | |
1230 | month() const noexcept | |
1231 | { return _M_m; } | |
1232 | ||
1233 | constexpr bool | |
1234 | ok() const noexcept | |
1235 | { return _M_m.ok(); } | |
1236 | ||
1237 | friend constexpr bool | |
1238 | operator==(const month_day_last& __x, const month_day_last& __y) noexcept | |
1239 | { return __x.month() == __y.month(); } | |
1240 | ||
1241 | friend constexpr strong_ordering | |
1242 | operator<=>(const month_day_last& __x, const month_day_last& __y) noexcept | |
1243 | = default; | |
1244 | ||
1245 | friend constexpr month_day_last | |
1246 | operator/(const chrono::month& __m, last_spec) noexcept | |
1247 | { return month_day_last{__m}; } | |
1248 | ||
1249 | friend constexpr month_day_last | |
1250 | operator/(int __m, last_spec) noexcept | |
1251 | { return chrono::month(unsigned(__m)) / last; } | |
1252 | ||
1253 | friend constexpr month_day_last | |
1254 | operator/(last_spec, const chrono::month& __m) noexcept | |
1255 | { return __m / last; } | |
1256 | ||
1257 | friend constexpr month_day_last | |
1258 | operator/(last_spec, int __m) noexcept | |
1259 | { return __m / last; } | |
1260 | ||
1261 | friend constexpr year_month_day_last | |
1262 | operator/(int __y, const month_day_last& __mdl) noexcept; | |
1263 | ||
1264 | friend constexpr year_month_day_last | |
1265 | operator/(const month_day_last& __mdl, int __y) noexcept; | |
03d5044b PP |
1266 | }; |
1267 | ||
1268 | // MONTH_WEEKDAY | |
1269 | ||
1270 | class month_weekday | |
1271 | { | |
1272 | private: | |
1273 | chrono::month _M_m; | |
1274 | chrono::weekday_indexed _M_wdi; | |
1275 | ||
1276 | public: | |
1277 | constexpr | |
1278 | month_weekday(const chrono::month& __m, | |
1279 | const chrono::weekday_indexed& __wdi) noexcept | |
1280 | : _M_m{__m}, _M_wdi{__wdi} | |
1281 | { } | |
1282 | ||
1283 | constexpr chrono::month | |
1284 | month() const noexcept | |
1285 | { return _M_m; } | |
1286 | ||
1287 | constexpr chrono::weekday_indexed | |
1288 | weekday_indexed() const noexcept | |
1289 | { return _M_wdi; } | |
1290 | ||
1291 | constexpr bool | |
1292 | ok() const noexcept | |
1293 | { return _M_m.ok() && _M_wdi.ok(); } | |
1294 | ||
1295 | friend constexpr bool | |
1296 | operator==(const month_weekday& __x, const month_weekday& __y) noexcept | |
1297 | { | |
1298 | return __x.month() == __y.month() | |
1299 | && __x.weekday_indexed() == __y.weekday_indexed(); | |
1300 | } | |
1301 | ||
1302 | friend constexpr month_weekday | |
1303 | operator/(const chrono::month& __m, | |
1304 | const chrono::weekday_indexed& __wdi) noexcept | |
1305 | { return {__m, __wdi}; } | |
1306 | ||
1307 | friend constexpr month_weekday | |
1308 | operator/(int __m, const chrono::weekday_indexed& __wdi) noexcept | |
1309 | { return chrono::month(unsigned(__m)) / __wdi; } | |
1310 | ||
1311 | friend constexpr month_weekday | |
1312 | operator/(const chrono::weekday_indexed& __wdi, | |
1313 | const chrono::month& __m) noexcept | |
1314 | { return __m / __wdi; } | |
1315 | ||
1316 | friend constexpr month_weekday | |
1317 | operator/(const chrono::weekday_indexed& __wdi, int __m) noexcept | |
1318 | { return __m / __wdi; } | |
1319 | ||
1320 | friend constexpr year_month_weekday | |
1321 | operator/(int __y, const month_weekday& __mwd) noexcept; | |
1322 | ||
1323 | friend constexpr year_month_weekday | |
1324 | operator/(const month_weekday& __mwd, int __y) noexcept; | |
03d5044b PP |
1325 | }; |
1326 | ||
1327 | // MONTH_WEEKDAY_LAST | |
1328 | ||
1329 | class month_weekday_last | |
1330 | { | |
1331 | private: | |
1332 | chrono::month _M_m; | |
1333 | chrono::weekday_last _M_wdl; | |
1334 | ||
1335 | public: | |
1336 | constexpr | |
1337 | month_weekday_last(const chrono::month& __m, | |
1338 | const chrono::weekday_last& __wdl) noexcept | |
1339 | :_M_m{__m}, _M_wdl{__wdl} | |
1340 | { } | |
1341 | ||
1342 | constexpr chrono::month | |
1343 | month() const noexcept | |
1344 | { return _M_m; } | |
1345 | ||
1346 | constexpr chrono::weekday_last | |
1347 | weekday_last() const noexcept | |
1348 | { return _M_wdl; } | |
1349 | ||
1350 | constexpr bool | |
1351 | ok() const noexcept | |
1352 | { return _M_m.ok() && _M_wdl.ok(); } | |
1353 | ||
1354 | friend constexpr bool | |
1355 | operator==(const month_weekday_last& __x, | |
1356 | const month_weekday_last& __y) noexcept | |
1357 | { | |
1358 | return __x.month() == __y.month() | |
1359 | && __x.weekday_last() == __y.weekday_last(); | |
1360 | } | |
1361 | ||
1362 | friend constexpr month_weekday_last | |
1363 | operator/(const chrono::month& __m, | |
1364 | const chrono::weekday_last& __wdl) noexcept | |
1365 | { return {__m, __wdl}; } | |
1366 | ||
1367 | friend constexpr month_weekday_last | |
1368 | operator/(int __m, const chrono::weekday_last& __wdl) noexcept | |
1369 | { return chrono::month(unsigned(__m)) / __wdl; } | |
1370 | ||
1371 | friend constexpr month_weekday_last | |
1372 | operator/(const chrono::weekday_last& __wdl, | |
1373 | const chrono::month& __m) noexcept | |
1374 | { return __m / __wdl; } | |
1375 | ||
1376 | friend constexpr month_weekday_last | |
1377 | operator/(const chrono::weekday_last& __wdl, int __m) noexcept | |
1378 | { return chrono::month(unsigned(__m)) / __wdl; } | |
1379 | ||
1380 | friend constexpr year_month_weekday_last | |
1381 | operator/(int __y, const month_weekday_last& __mwdl) noexcept; | |
1382 | ||
1383 | friend constexpr year_month_weekday_last | |
1384 | operator/(const month_weekday_last& __mwdl, int __y) noexcept; | |
03d5044b PP |
1385 | }; |
1386 | ||
1387 | // YEAR_MONTH | |
1388 | ||
7b743c67 PP |
1389 | namespace __detail |
1390 | { | |
1391 | // [time.cal.ym], [time.cal.ymd], etc constrain the 'months'-based | |
1392 | // addition/subtraction operator overloads like so: | |
1393 | // | |
1394 | // Constraints: if the argument supplied by the caller for the months | |
1395 | // parameter is convertible to years, its implicit conversion sequence | |
1396 | // to years is worse than its implicit conversion sequence to months. | |
1397 | // | |
1398 | // We realize this constraint by templatizing the 'months'-based | |
1399 | // overloads (using a dummy defaulted template parameter), so that | |
1400 | // overload resolution doesn't select the 'months'-based overload unless | |
1401 | // the implicit conversion sequence to 'months' is better than that to | |
1402 | // 'years'. | |
1403 | using __months_years_conversion_disambiguator = void; | |
1404 | } | |
1405 | ||
03d5044b PP |
1406 | class year_month |
1407 | { | |
1408 | private: | |
1409 | chrono::year _M_y; | |
1410 | chrono::month _M_m; | |
1411 | ||
1412 | public: | |
1413 | year_month() = default; | |
1414 | ||
1415 | constexpr | |
1416 | year_month(const chrono::year& __y, const chrono::month& __m) noexcept | |
1417 | : _M_y{__y}, _M_m{__m} | |
1418 | { } | |
1419 | ||
1420 | constexpr chrono::year | |
1421 | year() const noexcept | |
1422 | { return _M_y; } | |
1423 | ||
1424 | constexpr chrono::month | |
1425 | month() const noexcept | |
1426 | { return _M_m; } | |
1427 | ||
7b743c67 PP |
1428 | template<typename = __detail::__months_years_conversion_disambiguator> |
1429 | constexpr year_month& | |
1430 | operator+=(const months& __dm) noexcept | |
1431 | { | |
1432 | *this = *this + __dm; | |
1433 | return *this; | |
1434 | } | |
03d5044b | 1435 | |
7b743c67 PP |
1436 | template<typename = __detail::__months_years_conversion_disambiguator> |
1437 | constexpr year_month& | |
1438 | operator-=(const months& __dm) noexcept | |
1439 | { | |
1440 | *this = *this - __dm; | |
1441 | return *this; | |
1442 | } | |
03d5044b PP |
1443 | |
1444 | constexpr year_month& | |
1445 | operator+=(const years& __dy) noexcept | |
1446 | { | |
1447 | *this = *this + __dy; | |
1448 | return *this; | |
1449 | } | |
1450 | ||
1451 | constexpr year_month& | |
1452 | operator-=(const years& __dy) noexcept | |
1453 | { | |
1454 | *this = *this - __dy; | |
1455 | return *this; | |
1456 | } | |
1457 | ||
1458 | constexpr bool | |
1459 | ok() const noexcept | |
1460 | { return _M_y.ok() && _M_m.ok(); } | |
1461 | ||
1462 | friend constexpr bool | |
1463 | operator==(const year_month& __x, const year_month& __y) noexcept | |
1464 | { return __x.year() == __y.year() && __x.month() == __y.month(); } | |
1465 | ||
1466 | friend constexpr strong_ordering | |
1467 | operator<=>(const year_month& __x, const year_month& __y) noexcept | |
1468 | = default; | |
1469 | ||
7b743c67 PP |
1470 | template<typename = __detail::__months_years_conversion_disambiguator> |
1471 | friend constexpr year_month | |
1472 | operator+(const year_month& __ym, const months& __dm) noexcept | |
1473 | { | |
1474 | // TODO: Optimize? | |
1475 | auto __m = __ym.month() + __dm; | |
71e97161 | 1476 | auto __i = int(unsigned(__ym.month())) - 1 + __dm.count(); |
7b743c67 PP |
1477 | auto __y = (__i < 0 |
1478 | ? __ym.year() + years{(__i - 11) / 12} | |
1479 | : __ym.year() + years{__i / 12}); | |
1480 | return __y / __m; | |
1481 | } | |
03d5044b | 1482 | |
7b743c67 PP |
1483 | template<typename = __detail::__months_years_conversion_disambiguator> |
1484 | friend constexpr year_month | |
1485 | operator+(const months& __dm, const year_month& __ym) noexcept | |
1486 | { return __ym + __dm; } | |
03d5044b | 1487 | |
7b743c67 PP |
1488 | template<typename = __detail::__months_years_conversion_disambiguator> |
1489 | friend constexpr year_month | |
1490 | operator-(const year_month& __ym, const months& __dm) noexcept | |
1491 | { return __ym + -__dm; } | |
03d5044b PP |
1492 | |
1493 | friend constexpr months | |
1494 | operator-(const year_month& __x, const year_month& __y) noexcept | |
1495 | { | |
1496 | return (__x.year() - __y.year() | |
1497 | + months{static_cast<int>(unsigned{__x.month()}) | |
1498 | - static_cast<int>(unsigned{__y.month()})}); | |
1499 | } | |
1500 | ||
1501 | friend constexpr year_month | |
1502 | operator+(const year_month& __ym, const years& __dy) noexcept | |
1503 | { return (__ym.year() + __dy) / __ym.month(); } | |
1504 | ||
1505 | friend constexpr year_month | |
1506 | operator+(const years& __dy, const year_month& __ym) noexcept | |
1507 | { return __ym + __dy; } | |
1508 | ||
1509 | friend constexpr year_month | |
1510 | operator-(const year_month& __ym, const years& __dy) noexcept | |
1511 | { return __ym + -__dy; } | |
1512 | ||
1513 | friend constexpr year_month | |
1514 | operator/(const chrono::year& __y, const chrono::month& __m) noexcept | |
1515 | { return {__y, __m}; } | |
1516 | ||
1517 | friend constexpr year_month | |
1518 | operator/(const chrono::year& __y, int __m) noexcept | |
1519 | { return {__y, chrono::month(unsigned(__m))}; } | |
1520 | ||
1521 | friend constexpr year_month_day | |
1522 | operator/(const year_month& __ym, int __d) noexcept; | |
1523 | ||
1524 | friend constexpr year_month_day_last | |
1525 | operator/(const year_month& __ym, last_spec) noexcept; | |
03d5044b PP |
1526 | }; |
1527 | ||
1528 | // YEAR_MONTH_DAY | |
1529 | ||
1530 | class year_month_day | |
1531 | { | |
1532 | private: | |
1533 | chrono::year _M_y; | |
1534 | chrono::month _M_m; | |
1535 | chrono::day _M_d; | |
1536 | ||
1537 | static constexpr year_month_day _S_from_days(const days& __dp) noexcept; | |
1538 | ||
1539 | constexpr days _M_days_since_epoch() const noexcept; | |
1540 | ||
1541 | public: | |
1542 | year_month_day() = default; | |
1543 | ||
1544 | constexpr | |
1545 | year_month_day(const chrono::year& __y, const chrono::month& __m, | |
1546 | const chrono::day& __d) noexcept | |
1547 | : _M_y{__y}, _M_m{__m}, _M_d{__d} | |
1548 | { } | |
1549 | ||
1550 | constexpr | |
1551 | year_month_day(const year_month_day_last& __ymdl) noexcept; | |
1552 | ||
1553 | constexpr | |
1554 | year_month_day(const sys_days& __dp) noexcept | |
1555 | : year_month_day(_S_from_days(__dp.time_since_epoch())) | |
1556 | { } | |
1557 | ||
1558 | explicit constexpr | |
1559 | year_month_day(const local_days& __dp) noexcept | |
1560 | : year_month_day(sys_days{__dp.time_since_epoch()}) | |
1561 | { } | |
1562 | ||
7b743c67 PP |
1563 | template<typename = __detail::__months_years_conversion_disambiguator> |
1564 | constexpr year_month_day& | |
1565 | operator+=(const months& __m) noexcept | |
1566 | { | |
1567 | *this = *this + __m; | |
1568 | return *this; | |
1569 | } | |
03d5044b | 1570 | |
7b743c67 PP |
1571 | template<typename = __detail::__months_years_conversion_disambiguator> |
1572 | constexpr year_month_day& | |
1573 | operator-=(const months& __m) noexcept | |
1574 | { | |
1575 | *this = *this - __m; | |
1576 | return *this; | |
1577 | } | |
03d5044b PP |
1578 | |
1579 | constexpr year_month_day& | |
1580 | operator+=(const years& __y) noexcept | |
1581 | { | |
1582 | *this = *this + __y; | |
1583 | return *this; | |
1584 | } | |
1585 | ||
1586 | constexpr year_month_day& | |
1587 | operator-=(const years& __y) noexcept | |
1588 | { | |
1589 | *this = *this - __y; | |
1590 | return *this; | |
1591 | } | |
1592 | ||
1593 | constexpr chrono::year | |
1594 | year() const noexcept | |
1595 | { return _M_y; } | |
1596 | ||
1597 | constexpr chrono::month | |
1598 | month() const noexcept | |
1599 | { return _M_m; } | |
1600 | ||
1601 | constexpr chrono::day | |
1602 | day() const noexcept | |
1603 | { return _M_d; } | |
1604 | ||
1605 | constexpr | |
1606 | operator sys_days() const noexcept | |
1607 | { return sys_days{_M_days_since_epoch()}; } | |
1608 | ||
1609 | explicit constexpr | |
1610 | operator local_days() const noexcept | |
1611 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
1612 | ||
1613 | constexpr bool ok() const noexcept; | |
1614 | ||
1615 | friend constexpr bool | |
1616 | operator==(const year_month_day& __x, const year_month_day& __y) noexcept | |
1617 | { | |
1618 | return __x.year() == __y.year() | |
1619 | && __x.month() == __y.month() | |
1620 | && __x.day() == __y.day(); | |
1621 | } | |
1622 | ||
1623 | friend constexpr strong_ordering | |
1624 | operator<=>(const year_month_day& __x, const year_month_day& __y) noexcept | |
1625 | = default; | |
1626 | ||
7b743c67 PP |
1627 | template<typename = __detail::__months_years_conversion_disambiguator> |
1628 | friend constexpr year_month_day | |
1629 | operator+(const year_month_day& __ymd, const months& __dm) noexcept | |
1630 | { return (__ymd.year() / __ymd.month() + __dm) / __ymd.day(); } | |
03d5044b | 1631 | |
7b743c67 PP |
1632 | template<typename = __detail::__months_years_conversion_disambiguator> |
1633 | friend constexpr year_month_day | |
1634 | operator+(const months& __dm, const year_month_day& __ymd) noexcept | |
1635 | { return __ymd + __dm; } | |
03d5044b PP |
1636 | |
1637 | friend constexpr year_month_day | |
1638 | operator+(const year_month_day& __ymd, const years& __dy) noexcept | |
1639 | { return (__ymd.year() + __dy) / __ymd.month() / __ymd.day(); } | |
1640 | ||
1641 | friend constexpr year_month_day | |
1642 | operator+(const years& __dy, const year_month_day& __ymd) noexcept | |
1643 | { return __ymd + __dy; } | |
1644 | ||
7b743c67 PP |
1645 | template<typename = __detail::__months_years_conversion_disambiguator> |
1646 | friend constexpr year_month_day | |
1647 | operator-(const year_month_day& __ymd, const months& __dm) noexcept | |
1648 | { return __ymd + -__dm; } | |
03d5044b PP |
1649 | |
1650 | friend constexpr year_month_day | |
1651 | operator-(const year_month_day& __ymd, const years& __dy) noexcept | |
1652 | { return __ymd + -__dy; } | |
1653 | ||
1654 | friend constexpr year_month_day | |
1655 | operator/(const year_month& __ym, const chrono::day& __d) noexcept | |
1656 | { return {__ym.year(), __ym.month(), __d}; } | |
1657 | ||
1658 | friend constexpr year_month_day | |
1659 | operator/(const year_month& __ym, int __d) noexcept | |
1660 | { return __ym / chrono::day{unsigned(__d)}; } | |
1661 | ||
1662 | friend constexpr year_month_day | |
1663 | operator/(const chrono::year& __y, const month_day& __md) noexcept | |
1664 | { return __y / __md.month() / __md.day(); } | |
1665 | ||
1666 | friend constexpr year_month_day | |
1667 | operator/(int __y, const month_day& __md) noexcept | |
1668 | { return chrono::year{__y} / __md; } | |
1669 | ||
1670 | friend constexpr year_month_day | |
1671 | operator/(const month_day& __md, const chrono::year& __y) noexcept | |
1672 | { return __y / __md; } | |
1673 | ||
1674 | friend constexpr year_month_day | |
1675 | operator/(const month_day& __md, int __y) noexcept | |
1676 | { return chrono::year(__y) / __md; } | |
03d5044b PP |
1677 | }; |
1678 | ||
3dfd5493 CN |
1679 | // Construct from days since 1970/01/01. |
1680 | // Proposition 6.3 of Neri and Schneider, | |
1681 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". | |
1682 | // https://arxiv.org/abs/2102.06959 | |
03d5044b PP |
1683 | constexpr year_month_day |
1684 | year_month_day::_S_from_days(const days& __dp) noexcept | |
1685 | { | |
3dfd5493 CN |
1686 | constexpr auto __z2 = static_cast<uint32_t>(-1468000); |
1687 | constexpr auto __r2_e3 = static_cast<uint32_t>(536895458); | |
1688 | ||
a47cec4c | 1689 | const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3; |
3dfd5493 CN |
1690 | |
1691 | const auto __n1 = 4 * __r0 + 3; | |
1692 | const auto __q1 = __n1 / 146097; | |
1693 | const auto __r1 = __n1 % 146097 / 4; | |
1694 | ||
1695 | constexpr auto __p32 = static_cast<uint64_t>(1) << 32; | |
1696 | const auto __n2 = 4 * __r1 + 3; | |
1697 | const auto __u2 = static_cast<uint64_t>(2939745) * __n2; | |
1698 | const auto __q2 = static_cast<uint32_t>(__u2 / __p32); | |
1699 | const auto __r2 = static_cast<uint32_t>(__u2 % __p32) / 2939745 / 4; | |
1700 | ||
1701 | constexpr auto __p16 = static_cast<uint32_t>(1) << 16; | |
1702 | const auto __n3 = 2141 * __r2 + 197913; | |
1703 | const auto __q3 = __n3 / __p16; | |
1704 | const auto __r3 = __n3 % __p16 / 2141; | |
1705 | ||
1706 | const auto __y0 = 100 * __q1 + __q2; | |
1707 | const auto __m0 = __q3; | |
1708 | const auto __d0 = __r3; | |
1709 | ||
1710 | const auto __j = __r2 >= 306; | |
1711 | const auto __y1 = __y0 + __j; | |
1712 | const auto __m1 = __j ? __m0 - 12 : __m0; | |
1713 | const auto __d1 = __d0 + 1; | |
1714 | ||
75c74a83 JW |
1715 | return year_month_day{chrono::year{static_cast<int>(__y1 + __z2)}, |
1716 | chrono::month{__m1}, chrono::day{__d1}}; | |
03d5044b PP |
1717 | } |
1718 | ||
97d6161f CN |
1719 | // Days since 1970/01/01. |
1720 | // Proposition 6.2 of Neri and Schneider, | |
1721 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". | |
1722 | // https://arxiv.org/abs/2102.06959 | |
03d5044b PP |
1723 | constexpr days |
1724 | year_month_day::_M_days_since_epoch() const noexcept | |
1725 | { | |
97d6161f CN |
1726 | auto constexpr __z2 = static_cast<uint32_t>(-1468000); |
1727 | auto constexpr __r2_e3 = static_cast<uint32_t>(536895458); | |
1728 | ||
1729 | const auto __y1 = static_cast<uint32_t>(static_cast<int>(_M_y)) - __z2; | |
699672d4 JW |
1730 | const auto __m1 = static_cast<uint32_t>(static_cast<unsigned>(_M_m)); |
1731 | const auto __d1 = static_cast<uint32_t>(static_cast<unsigned>(_M_d)); | |
97d6161f CN |
1732 | |
1733 | const auto __j = static_cast<uint32_t>(__m1 < 3); | |
1734 | const auto __y0 = __y1 - __j; | |
1735 | const auto __m0 = __j ? __m1 + 12 : __m1; | |
1736 | const auto __d0 = __d1 - 1; | |
1737 | ||
1738 | const auto __q1 = __y0 / 100; | |
1739 | const auto __yc = 1461 * __y0 / 4 - __q1 + __q1 / 4; | |
1740 | const auto __mc = (979 *__m0 - 2919) / 32; | |
1741 | const auto __dc = __d0; | |
1742 | ||
1743 | return days{static_cast<int32_t>(__yc + __mc + __dc - __r2_e3)}; | |
03d5044b PP |
1744 | } |
1745 | ||
1746 | // YEAR_MONTH_DAY_LAST | |
1747 | ||
1748 | class year_month_day_last | |
1749 | { | |
1750 | private: | |
1751 | chrono::year _M_y; | |
1752 | chrono::month_day_last _M_mdl; | |
1753 | ||
1754 | public: | |
1755 | constexpr | |
1756 | year_month_day_last(const chrono::year& __y, | |
1757 | const chrono::month_day_last& __mdl) noexcept | |
1758 | : _M_y{__y}, _M_mdl{__mdl} | |
1759 | { } | |
1760 | ||
7b743c67 PP |
1761 | template<typename = __detail::__months_years_conversion_disambiguator> |
1762 | constexpr year_month_day_last& | |
1763 | operator+=(const months& __m) noexcept | |
1764 | { | |
1765 | *this = *this + __m; | |
1766 | return *this; | |
1767 | } | |
03d5044b | 1768 | |
7b743c67 PP |
1769 | template<typename = __detail::__months_years_conversion_disambiguator> |
1770 | constexpr year_month_day_last& | |
1771 | operator-=(const months& __m) noexcept | |
1772 | { | |
1773 | *this = *this - __m; | |
1774 | return *this; | |
1775 | } | |
03d5044b PP |
1776 | |
1777 | constexpr year_month_day_last& | |
1778 | operator+=(const years& __y) noexcept | |
1779 | { | |
1780 | *this = *this + __y; | |
1781 | return *this; | |
1782 | } | |
1783 | ||
1784 | constexpr year_month_day_last& | |
1785 | operator-=(const years& __y) noexcept | |
1786 | { | |
1787 | *this = *this - __y; | |
1788 | return *this; | |
1789 | } | |
1790 | ||
1791 | constexpr chrono::year | |
1792 | year() const noexcept | |
1793 | { return _M_y; } | |
1794 | ||
1795 | constexpr chrono::month | |
1796 | month() const noexcept | |
1797 | { return _M_mdl.month(); } | |
1798 | ||
1799 | constexpr chrono::month_day_last | |
1800 | month_day_last() const noexcept | |
1801 | { return _M_mdl; } | |
1802 | ||
1803 | // Return A day representing the last day of this year, month pair. | |
1804 | constexpr chrono::day | |
1805 | day() const noexcept | |
1806 | { | |
8265ab07 CN |
1807 | const auto __m = static_cast<unsigned>(month()); |
1808 | ||
1809 | // Excluding February, the last day of month __m is either 30 or 31 or, | |
1810 | // in another words, it is 30 + b = 30 | b, where b is in {0, 1}. | |
1811 | ||
1812 | // If __m in {1, 3, 4, 5, 6, 7}, then b is 1 if, and only if __m is odd. | |
1813 | // Hence, b = __m & 1 = (__m ^ 0) & 1. | |
1814 | ||
1815 | // If __m in {8, 9, 10, 11, 12}, then b is 1 if, and only if __m is even. | |
1816 | // Hence, b = (__m ^ 1) & 1. | |
1817 | ||
1818 | // Therefore, b = (__m ^ c) & 1, where c = 0, if __m < 8, or c = 1 if | |
1819 | // __m >= 8, that is, c = __m >> 3. | |
1820 | ||
1821 | // The above mathematically justifies this implementation whose | |
1822 | // performance does not depend on look-up tables being on the L1 cache. | |
1823 | return chrono::day{__m != 2 ? ((__m ^ (__m >> 3)) & 1) | 30 | |
1824 | : _M_y.is_leap() ? 29 : 28}; | |
03d5044b PP |
1825 | } |
1826 | ||
1827 | constexpr | |
1828 | operator sys_days() const noexcept | |
1829 | { return sys_days{year() / month() / day()}; } | |
1830 | ||
1831 | explicit constexpr | |
1832 | operator local_days() const noexcept | |
1833 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
1834 | ||
1835 | constexpr bool | |
1836 | ok() const noexcept | |
1837 | { return _M_y.ok() && _M_mdl.ok(); } | |
1838 | ||
1839 | friend constexpr bool | |
1840 | operator==(const year_month_day_last& __x, | |
1841 | const year_month_day_last& __y) noexcept | |
1842 | { | |
1843 | return __x.year() == __y.year() | |
1844 | && __x.month_day_last() == __y.month_day_last(); | |
1845 | } | |
1846 | ||
1847 | friend constexpr strong_ordering | |
1848 | operator<=>(const year_month_day_last& __x, | |
1849 | const year_month_day_last& __y) noexcept | |
1850 | = default; | |
1851 | ||
7b743c67 PP |
1852 | template<typename = __detail::__months_years_conversion_disambiguator> |
1853 | friend constexpr year_month_day_last | |
1854 | operator+(const year_month_day_last& __ymdl, | |
1855 | const months& __dm) noexcept | |
1856 | { return (__ymdl.year() / __ymdl.month() + __dm) / last; } | |
03d5044b | 1857 | |
7b743c67 PP |
1858 | template<typename = __detail::__months_years_conversion_disambiguator> |
1859 | friend constexpr year_month_day_last | |
1860 | operator+(const months& __dm, | |
1861 | const year_month_day_last& __ymdl) noexcept | |
1862 | { return __ymdl + __dm; } | |
03d5044b | 1863 | |
7b743c67 PP |
1864 | template<typename = __detail::__months_years_conversion_disambiguator> |
1865 | friend constexpr year_month_day_last | |
1866 | operator-(const year_month_day_last& __ymdl, | |
1867 | const months& __dm) noexcept | |
1868 | { return __ymdl + -__dm; } | |
03d5044b PP |
1869 | |
1870 | friend constexpr year_month_day_last | |
1871 | operator+(const year_month_day_last& __ymdl, | |
1872 | const years& __dy) noexcept | |
1873 | { return {__ymdl.year() + __dy, __ymdl.month_day_last()}; } | |
1874 | ||
1875 | friend constexpr year_month_day_last | |
1876 | operator+(const years& __dy, | |
1877 | const year_month_day_last& __ymdl) noexcept | |
1878 | { return __ymdl + __dy; } | |
1879 | ||
1880 | friend constexpr year_month_day_last | |
1881 | operator-(const year_month_day_last& __ymdl, | |
1882 | const years& __dy) noexcept | |
1883 | { return __ymdl + -__dy; } | |
1884 | ||
1885 | friend constexpr year_month_day_last | |
1886 | operator/(const year_month& __ym, last_spec) noexcept | |
1887 | { return {__ym.year(), chrono::month_day_last{__ym.month()}}; } | |
1888 | ||
1889 | friend constexpr year_month_day_last | |
1890 | operator/(const chrono::year& __y, | |
1891 | const chrono::month_day_last& __mdl) noexcept | |
1892 | { return {__y, __mdl}; } | |
1893 | ||
1894 | friend constexpr year_month_day_last | |
1895 | operator/(int __y, const chrono::month_day_last& __mdl) noexcept | |
1896 | { return chrono::year(__y) / __mdl; } | |
1897 | ||
1898 | friend constexpr year_month_day_last | |
1899 | operator/(const chrono::month_day_last& __mdl, | |
1900 | const chrono::year& __y) noexcept | |
1901 | { return __y / __mdl; } | |
1902 | ||
1903 | friend constexpr year_month_day_last | |
1904 | operator/(const chrono::month_day_last& __mdl, int __y) noexcept | |
1905 | { return chrono::year(__y) / __mdl; } | |
03d5044b PP |
1906 | }; |
1907 | ||
1908 | // year_month_day ctor from year_month_day_last | |
1909 | constexpr | |
1910 | year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept | |
1911 | : _M_y{__ymdl.year()}, _M_m{__ymdl.month()}, _M_d{__ymdl.day()} | |
1912 | { } | |
1913 | ||
1914 | constexpr bool | |
1915 | year_month_day::ok() const noexcept | |
1916 | { | |
1917 | if (!_M_y.ok() || !_M_m.ok()) | |
1918 | return false; | |
1919 | return chrono::day{1} <= _M_d && _M_d <= (_M_y / _M_m / last).day(); | |
1920 | } | |
1921 | ||
1922 | // YEAR_MONTH_WEEKDAY | |
1923 | ||
1924 | class year_month_weekday | |
1925 | { | |
1926 | private: | |
1927 | chrono::year _M_y; | |
1928 | chrono::month _M_m; | |
1929 | chrono::weekday_indexed _M_wdi; | |
1930 | ||
1931 | static constexpr year_month_weekday | |
1932 | _S_from_sys_days(const sys_days& __dp) | |
1933 | { | |
1934 | year_month_day __ymd{__dp}; | |
1935 | chrono::weekday __wd{__dp}; | |
1936 | auto __index = __wd[(unsigned{__ymd.day()} - 1) / 7 + 1]; | |
1937 | return {__ymd.year(), __ymd.month(), __index}; | |
1938 | } | |
1939 | ||
1940 | public: | |
1941 | year_month_weekday() = default; | |
1942 | ||
1943 | constexpr | |
1944 | year_month_weekday(const chrono::year& __y, const chrono::month& __m, | |
1945 | const chrono::weekday_indexed& __wdi) noexcept | |
1946 | : _M_y{__y}, _M_m{__m}, _M_wdi{__wdi} | |
1947 | { } | |
1948 | ||
1949 | constexpr | |
1950 | year_month_weekday(const sys_days& __dp) noexcept | |
1951 | : year_month_weekday{_S_from_sys_days(__dp)} | |
1952 | { } | |
1953 | ||
1954 | explicit constexpr | |
1955 | year_month_weekday(const local_days& __dp) noexcept | |
1956 | : year_month_weekday{sys_days{__dp.time_since_epoch()}} | |
1957 | { } | |
1958 | ||
7b743c67 PP |
1959 | template<typename = __detail::__months_years_conversion_disambiguator> |
1960 | constexpr year_month_weekday& | |
1961 | operator+=(const months& __m) noexcept | |
1962 | { | |
1963 | *this = *this + __m; | |
1964 | return *this; | |
1965 | } | |
03d5044b | 1966 | |
7b743c67 PP |
1967 | template<typename = __detail::__months_years_conversion_disambiguator> |
1968 | constexpr year_month_weekday& | |
1969 | operator-=(const months& __m) noexcept | |
1970 | { | |
1971 | *this = *this - __m; | |
1972 | return *this; | |
1973 | } | |
03d5044b PP |
1974 | |
1975 | constexpr year_month_weekday& | |
1976 | operator+=(const years& __y) noexcept | |
1977 | { | |
1978 | *this = *this + __y; | |
1979 | return *this; | |
1980 | } | |
1981 | ||
1982 | constexpr year_month_weekday& | |
1983 | operator-=(const years& __y) noexcept | |
1984 | { | |
1985 | *this = *this - __y; | |
1986 | return *this; | |
1987 | } | |
1988 | ||
1989 | constexpr chrono::year | |
1990 | year() const noexcept | |
1991 | { return _M_y; } | |
1992 | ||
1993 | constexpr chrono::month | |
1994 | month() const noexcept | |
1995 | { return _M_m; } | |
1996 | ||
1997 | constexpr chrono::weekday | |
1998 | weekday() const noexcept | |
1999 | { return _M_wdi.weekday(); } | |
2000 | ||
2001 | constexpr unsigned | |
2002 | index() const noexcept | |
2003 | { return _M_wdi.index(); } | |
2004 | ||
2005 | constexpr chrono::weekday_indexed | |
2006 | weekday_indexed() const noexcept | |
2007 | { return _M_wdi; } | |
2008 | ||
2009 | constexpr | |
2010 | operator sys_days() const noexcept | |
2011 | { | |
2012 | auto __d = sys_days{year() / month() / 1}; | |
8572edc8 PP |
2013 | return __d + (weekday() - chrono::weekday(__d) |
2014 | + days{(static_cast<int>(index())-1)*7}); | |
03d5044b PP |
2015 | } |
2016 | ||
2017 | explicit constexpr | |
2018 | operator local_days() const noexcept | |
2019 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
2020 | ||
2021 | constexpr bool | |
2022 | ok() const noexcept | |
2023 | { | |
2024 | if (!_M_y.ok() || !_M_m.ok() || !_M_wdi.ok()) | |
2025 | return false; | |
2026 | if (_M_wdi.index() <= 4) | |
2027 | return true; | |
2028 | days __d = (_M_wdi.weekday() | |
2029 | - chrono::weekday{sys_days{_M_y / _M_m / 1}} | |
2030 | + days((_M_wdi.index()-1)*7 + 1)); | |
1007170d | 2031 | __glibcxx_assert(__d.count() >= 1); |
9fc61d45 | 2032 | return (unsigned)__d.count() <= (unsigned)(_M_y / _M_m / last).day(); |
03d5044b PP |
2033 | } |
2034 | ||
2035 | friend constexpr bool | |
2036 | operator==(const year_month_weekday& __x, | |
2037 | const year_month_weekday& __y) noexcept | |
2038 | { | |
2039 | return __x.year() == __y.year() | |
2040 | && __x.month() == __y.month() | |
0c5df67f | 2041 | && __x.weekday_indexed() == __y.weekday_indexed(); |
03d5044b PP |
2042 | } |
2043 | ||
7b743c67 PP |
2044 | template<typename = __detail::__months_years_conversion_disambiguator> |
2045 | friend constexpr year_month_weekday | |
2046 | operator+(const year_month_weekday& __ymwd, const months& __dm) noexcept | |
2047 | { | |
2048 | return ((__ymwd.year() / __ymwd.month() + __dm) | |
2049 | / __ymwd.weekday_indexed()); | |
2050 | } | |
03d5044b | 2051 | |
7b743c67 PP |
2052 | template<typename = __detail::__months_years_conversion_disambiguator> |
2053 | friend constexpr year_month_weekday | |
2054 | operator+(const months& __dm, const year_month_weekday& __ymwd) noexcept | |
2055 | { return __ymwd + __dm; } | |
03d5044b PP |
2056 | |
2057 | friend constexpr year_month_weekday | |
2058 | operator+(const year_month_weekday& __ymwd, const years& __dy) noexcept | |
2059 | { return {__ymwd.year() + __dy, __ymwd.month(), __ymwd.weekday_indexed()}; } | |
2060 | ||
2061 | friend constexpr year_month_weekday | |
2062 | operator+(const years& __dy, const year_month_weekday& __ymwd) noexcept | |
2063 | { return __ymwd + __dy; } | |
2064 | ||
7b743c67 PP |
2065 | template<typename = __detail::__months_years_conversion_disambiguator> |
2066 | friend constexpr year_month_weekday | |
2067 | operator-(const year_month_weekday& __ymwd, const months& __dm) noexcept | |
2068 | { return __ymwd + -__dm; } | |
03d5044b PP |
2069 | |
2070 | friend constexpr year_month_weekday | |
2071 | operator-(const year_month_weekday& __ymwd, const years& __dy) noexcept | |
2072 | { return __ymwd + -__dy; } | |
2073 | ||
2074 | friend constexpr year_month_weekday | |
2075 | operator/(const year_month& __ym, | |
2076 | const chrono::weekday_indexed& __wdi) noexcept | |
2077 | { return {__ym.year(), __ym.month(), __wdi}; } | |
2078 | ||
2079 | friend constexpr year_month_weekday | |
2080 | operator/(const chrono::year& __y, const month_weekday& __mwd) noexcept | |
2081 | { return {__y, __mwd.month(), __mwd.weekday_indexed()}; } | |
2082 | ||
2083 | friend constexpr year_month_weekday | |
2084 | operator/(int __y, const month_weekday& __mwd) noexcept | |
2085 | { return chrono::year(__y) / __mwd; } | |
2086 | ||
2087 | friend constexpr year_month_weekday | |
2088 | operator/(const month_weekday& __mwd, const chrono::year& __y) noexcept | |
2089 | { return __y / __mwd; } | |
2090 | ||
2091 | friend constexpr year_month_weekday | |
2092 | operator/(const month_weekday& __mwd, int __y) noexcept | |
2093 | { return chrono::year(__y) / __mwd; } | |
03d5044b PP |
2094 | }; |
2095 | ||
2096 | // YEAR_MONTH_WEEKDAY_LAST | |
2097 | ||
2098 | class year_month_weekday_last | |
2099 | { | |
2100 | private: | |
2101 | chrono::year _M_y; | |
2102 | chrono::month _M_m; | |
2103 | chrono::weekday_last _M_wdl; | |
2104 | ||
2105 | public: | |
2106 | constexpr | |
2107 | year_month_weekday_last(const chrono::year& __y, const chrono::month& __m, | |
2108 | const chrono::weekday_last& __wdl) noexcept | |
2109 | : _M_y{__y}, _M_m{__m}, _M_wdl{__wdl} | |
2110 | { } | |
2111 | ||
7b743c67 PP |
2112 | template<typename = __detail::__months_years_conversion_disambiguator> |
2113 | constexpr year_month_weekday_last& | |
2114 | operator+=(const months& __m) noexcept | |
2115 | { | |
2116 | *this = *this + __m; | |
2117 | return *this; | |
2118 | } | |
03d5044b | 2119 | |
7b743c67 PP |
2120 | template<typename = __detail::__months_years_conversion_disambiguator> |
2121 | constexpr year_month_weekday_last& | |
2122 | operator-=(const months& __m) noexcept | |
2123 | { | |
2124 | *this = *this - __m; | |
2125 | return *this; | |
2126 | } | |
03d5044b PP |
2127 | |
2128 | constexpr year_month_weekday_last& | |
2129 | operator+=(const years& __y) noexcept | |
2130 | { | |
2131 | *this = *this + __y; | |
2132 | return *this; | |
2133 | } | |
2134 | ||
2135 | constexpr year_month_weekday_last& | |
2136 | operator-=(const years& __y) noexcept | |
2137 | { | |
2138 | *this = *this - __y; | |
2139 | return *this; | |
2140 | } | |
2141 | ||
2142 | constexpr chrono::year | |
2143 | year() const noexcept | |
2144 | { return _M_y; } | |
2145 | ||
2146 | constexpr chrono::month | |
2147 | month() const noexcept | |
2148 | { return _M_m; } | |
2149 | ||
2150 | constexpr chrono::weekday | |
2151 | weekday() const noexcept | |
2152 | { return _M_wdl.weekday(); } | |
2153 | ||
2154 | constexpr chrono::weekday_last | |
2155 | weekday_last() const noexcept | |
2156 | { return _M_wdl; } | |
2157 | ||
2158 | constexpr | |
2159 | operator sys_days() const noexcept | |
2160 | { | |
2161 | const auto __d = sys_days{_M_y / _M_m / last}; | |
2162 | return sys_days{(__d - (chrono::weekday{__d} | |
2163 | - _M_wdl.weekday())).time_since_epoch()}; | |
2164 | } | |
2165 | ||
2166 | explicit constexpr | |
2167 | operator local_days() const noexcept | |
2168 | { return local_days{sys_days{*this}.time_since_epoch()}; } | |
2169 | ||
2170 | constexpr bool | |
2171 | ok() const noexcept | |
2172 | { return _M_y.ok() && _M_m.ok() && _M_wdl.ok(); } | |
2173 | ||
2174 | friend constexpr bool | |
2175 | operator==(const year_month_weekday_last& __x, | |
2176 | const year_month_weekday_last& __y) noexcept | |
2177 | { | |
2178 | return __x.year() == __y.year() | |
2179 | && __x.month() == __y.month() | |
2180 | && __x.weekday_last() == __y.weekday_last(); | |
2181 | } | |
2182 | ||
7b743c67 PP |
2183 | template<typename = __detail::__months_years_conversion_disambiguator> |
2184 | friend constexpr year_month_weekday_last | |
2185 | operator+(const year_month_weekday_last& __ymwdl, | |
2186 | const months& __dm) noexcept | |
2187 | { | |
2188 | return ((__ymwdl.year() / __ymwdl.month() + __dm) | |
2189 | / __ymwdl.weekday_last()); | |
2190 | } | |
03d5044b | 2191 | |
7b743c67 PP |
2192 | template<typename = __detail::__months_years_conversion_disambiguator> |
2193 | friend constexpr year_month_weekday_last | |
2194 | operator+(const months& __dm, | |
2195 | const year_month_weekday_last& __ymwdl) noexcept | |
2196 | { return __ymwdl + __dm; } | |
03d5044b PP |
2197 | |
2198 | friend constexpr year_month_weekday_last | |
2199 | operator+(const year_month_weekday_last& __ymwdl, | |
2200 | const years& __dy) noexcept | |
2201 | { return {__ymwdl.year() + __dy, __ymwdl.month(), __ymwdl.weekday_last()}; } | |
2202 | ||
2203 | friend constexpr year_month_weekday_last | |
2204 | operator+(const years& __dy, | |
2205 | const year_month_weekday_last& __ymwdl) noexcept | |
2206 | { return __ymwdl + __dy; } | |
2207 | ||
7b743c67 PP |
2208 | template<typename = __detail::__months_years_conversion_disambiguator> |
2209 | friend constexpr year_month_weekday_last | |
2210 | operator-(const year_month_weekday_last& __ymwdl, | |
2211 | const months& __dm) noexcept | |
2212 | { return __ymwdl + -__dm; } | |
03d5044b PP |
2213 | |
2214 | friend constexpr year_month_weekday_last | |
2215 | operator-(const year_month_weekday_last& __ymwdl, | |
2216 | const years& __dy) noexcept | |
2217 | { return __ymwdl + -__dy; } | |
2218 | ||
2219 | friend constexpr year_month_weekday_last | |
2220 | operator/(const year_month& __ym, | |
2221 | const chrono::weekday_last& __wdl) noexcept | |
2222 | { return {__ym.year(), __ym.month(), __wdl}; } | |
2223 | ||
2224 | friend constexpr year_month_weekday_last | |
2225 | operator/(const chrono::year& __y, | |
2226 | const chrono::month_weekday_last& __mwdl) noexcept | |
2227 | { return {__y, __mwdl.month(), __mwdl.weekday_last()}; } | |
2228 | ||
2229 | friend constexpr year_month_weekday_last | |
2230 | operator/(int __y, const chrono::month_weekday_last& __mwdl) noexcept | |
2231 | { return chrono::year(__y) / __mwdl; } | |
2232 | ||
2233 | friend constexpr year_month_weekday_last | |
2234 | operator/(const chrono::month_weekday_last& __mwdl, | |
2235 | const chrono::year& __y) noexcept | |
2236 | { return __y / __mwdl; } | |
2237 | ||
2238 | friend constexpr year_month_weekday_last | |
2239 | operator/(const chrono::month_weekday_last& __mwdl, int __y) noexcept | |
2240 | { return chrono::year(__y) / __mwdl; } | |
03d5044b PP |
2241 | }; |
2242 | ||
2243 | // HH_MM_SS | |
2244 | ||
5329e1a8 | 2245 | /// @cond undocumented |
03d5044b PP |
2246 | namespace __detail |
2247 | { | |
2248 | consteval long long | |
2249 | __pow10(unsigned __n) | |
2250 | { | |
2251 | long long __r = 1; | |
2252 | while (__n-- > 0) | |
2253 | __r *= 10; | |
2254 | return __r; | |
2255 | } | |
f99b9486 JW |
2256 | |
2257 | template<typename _Duration> struct __utc_leap_second; | |
03d5044b | 2258 | } |
5329e1a8 | 2259 | /// @endcond |
03d5044b | 2260 | |
5329e1a8 JW |
2261 | /** Utility for splitting a duration into hours, minutes, and seconds |
2262 | * | |
2263 | * This is a convenience type that provides accessors for the constituent | |
2264 | * parts (hours, minutes, seconds and subseconds) of a duration. | |
2265 | * | |
2266 | * @since C++20 | |
2267 | */ | |
03d5044b PP |
2268 | template<typename _Duration> |
2269 | class hh_mm_ss | |
2270 | { | |
5329e1a8 JW |
2271 | static_assert( __is_duration<_Duration>::value ); |
2272 | ||
03d5044b | 2273 | private: |
5329e1a8 | 2274 | static consteval int |
03d5044b PP |
2275 | _S_fractional_width() |
2276 | { | |
03d5044b | 2277 | auto __den = _Duration::period::den; |
5329e1a8 JW |
2278 | const int __multiplicity_2 = std::__countr_zero((uintmax_t)__den); |
2279 | __den >>= __multiplicity_2; | |
2280 | int __multiplicity_5 = 0; | |
03d5044b PP |
2281 | while ((__den % 5) == 0) |
2282 | { | |
2283 | ++__multiplicity_5; | |
2284 | __den /= 5; | |
2285 | } | |
2286 | if (__den != 1) | |
2287 | return 6; | |
2288 | ||
2289 | int __width = (__multiplicity_2 > __multiplicity_5 | |
2290 | ? __multiplicity_2 : __multiplicity_5); | |
2291 | if (__width > 18) | |
2292 | __width = 18; | |
2293 | return __width; | |
2294 | } | |
2295 | ||
5329e1a8 | 2296 | constexpr |
e36e57b0 | 2297 | hh_mm_ss(_Duration __d, bool __is_neg) |
5329e1a8 JW |
2298 | : _M_h (duration_cast<chrono::hours>(__d)), |
2299 | _M_m (duration_cast<chrono::minutes>(__d - hours())), | |
2300 | _M_s (duration_cast<chrono::seconds>(__d - hours() - minutes())), | |
2301 | _M_is_neg(__is_neg) | |
2302 | { | |
2303 | auto __ss = __d - hours() - minutes() - seconds(); | |
2304 | if constexpr (treat_as_floating_point_v<typename precision::rep>) | |
2305 | _M_ss._M_r = __ss.count(); | |
2306 | else if constexpr (precision::period::den != 1) | |
2307 | _M_ss._M_r = duration_cast<precision>(__ss).count(); | |
2308 | } | |
2309 | ||
e36e57b0 JW |
2310 | static constexpr _Duration |
2311 | _S_abs(_Duration __d) | |
2312 | { | |
2313 | if constexpr (numeric_limits<typename _Duration::rep>::is_signed) | |
2314 | return chrono::abs(__d); | |
2315 | else | |
2316 | return __d; | |
2317 | } | |
2318 | ||
03d5044b PP |
2319 | public: |
2320 | static constexpr unsigned fractional_width = {_S_fractional_width()}; | |
2321 | ||
2322 | using precision | |
2323 | = duration<common_type_t<typename _Duration::rep, | |
2324 | chrono::seconds::rep>, | |
2325 | ratio<1, __detail::__pow10(fractional_width)>>; | |
2326 | ||
5329e1a8 | 2327 | constexpr hh_mm_ss() noexcept = default; |
03d5044b PP |
2328 | |
2329 | constexpr explicit | |
e36e57b0 JW |
2330 | hh_mm_ss(_Duration __d) |
2331 | : hh_mm_ss(_S_abs(__d), __d < _Duration::zero()) | |
5329e1a8 | 2332 | { } |
03d5044b PP |
2333 | |
2334 | constexpr bool | |
2335 | is_negative() const noexcept | |
5329e1a8 | 2336 | { |
cb363fd9 | 2337 | if constexpr (!_S_is_unsigned) |
5329e1a8 JW |
2338 | return _M_is_neg; |
2339 | else | |
2340 | return false; | |
2341 | } | |
03d5044b PP |
2342 | |
2343 | constexpr chrono::hours | |
2344 | hours() const noexcept | |
2345 | { return _M_h; } | |
2346 | ||
2347 | constexpr chrono::minutes | |
2348 | minutes() const noexcept | |
2349 | { return _M_m; } | |
2350 | ||
2351 | constexpr chrono::seconds | |
2352 | seconds() const noexcept | |
2353 | { return _M_s; } | |
2354 | ||
2355 | constexpr precision | |
2356 | subseconds() const noexcept | |
5329e1a8 | 2357 | { return static_cast<precision>(_M_ss); } |
03d5044b PP |
2358 | |
2359 | constexpr explicit | |
2360 | operator precision() const noexcept | |
2361 | { return to_duration(); } | |
2362 | ||
2363 | constexpr precision | |
2364 | to_duration() const noexcept | |
2365 | { | |
cb363fd9 | 2366 | if constexpr (!_S_is_unsigned) |
5329e1a8 JW |
2367 | if (_M_is_neg) |
2368 | return -(_M_h + _M_m + _M_s + subseconds()); | |
2369 | return _M_h + _M_m + _M_s + subseconds(); | |
03d5044b PP |
2370 | } |
2371 | ||
03d5044b | 2372 | private: |
cb363fd9 | 2373 | static constexpr bool _S_is_unsigned |
5329e1a8 JW |
2374 | = __and_v<is_integral<typename _Duration::rep>, |
2375 | is_unsigned<typename _Duration::rep>>; | |
2376 | ||
2377 | template<typename _Ratio> | |
2378 | using __byte_duration = duration<unsigned char, _Ratio>; | |
2379 | ||
2380 | // The type of the _M_ss member that holds the subsecond precision. | |
2381 | template<typename _Dur> | |
2382 | struct __subseconds | |
2383 | { | |
2384 | typename _Dur::rep _M_r{}; | |
2385 | ||
2386 | constexpr explicit | |
2387 | operator _Dur() const noexcept | |
2388 | { return _Dur(_M_r); } | |
2389 | }; | |
2390 | ||
2391 | // An empty class if this precision doesn't need subseconds. | |
2392 | template<typename _Rep> | |
2393 | requires (!treat_as_floating_point_v<_Rep>) | |
2394 | struct __subseconds<duration<_Rep, ratio<1>>> | |
2395 | { | |
2396 | constexpr explicit | |
2397 | operator duration<_Rep, ratio<1>>() const noexcept | |
2398 | { return {}; } | |
2399 | }; | |
2400 | ||
2401 | // True if the maximum constructor argument can be represented in _Tp. | |
2402 | template<typename _Tp> | |
2403 | static constexpr bool __fits | |
2404 | = duration_values<typename _Duration::rep>::max() | |
2405 | <= duration_values<_Tp>::max(); | |
2406 | ||
2407 | template<typename _Rep, typename _Period> | |
2408 | requires (!treat_as_floating_point_v<_Rep>) | |
2409 | && ratio_less_v<_Period, ratio<1, 1>> | |
2410 | && (ratio_greater_equal_v<_Period, ratio<1, 250>> | |
2411 | || __fits<unsigned char>) | |
2412 | struct __subseconds<duration<_Rep, _Period>> | |
2413 | { | |
2414 | unsigned char _M_r{}; | |
2415 | ||
2416 | constexpr explicit | |
2417 | operator duration<_Rep, _Period>() const noexcept | |
2418 | { return duration<_Rep, _Period>(_M_r); } | |
2419 | }; | |
2420 | ||
2421 | template<typename _Rep, typename _Period> | |
2422 | requires (!treat_as_floating_point_v<_Rep>) | |
2423 | && ratio_less_v<_Period, ratio<1, 250>> | |
d61c0357 | 2424 | && (ratio_greater_equal_v<_Period, ratio<1, 4000000000>> |
5329e1a8 JW |
2425 | || __fits<uint_least32_t>) |
2426 | struct __subseconds<duration<_Rep, _Period>> | |
2427 | { | |
2428 | uint_least32_t _M_r{}; | |
2429 | ||
2430 | constexpr explicit | |
2431 | operator duration<_Rep, _Period>() const noexcept | |
2432 | { return duration<_Rep, _Period>(_M_r); } | |
2433 | }; | |
2434 | ||
2435 | chrono::hours _M_h{}; | |
2436 | __byte_duration<ratio<60>> _M_m{}; | |
2437 | __byte_duration<ratio<1>> _M_s{}; | |
2438 | bool _M_is_neg{}; | |
2439 | __subseconds<precision> _M_ss{}; | |
f99b9486 JW |
2440 | |
2441 | template<typename> friend struct __detail::__utc_leap_second; | |
03d5044b | 2442 | }; |
f2ce64b5 | 2443 | |
f99b9486 JW |
2444 | /// @cond undocumented |
2445 | namespace __detail | |
2446 | { | |
2447 | // Represents a time that is within a leap second insertion. | |
2448 | template<typename _Duration> | |
2449 | struct __utc_leap_second | |
2450 | { | |
2451 | explicit | |
2452 | __utc_leap_second(const sys_time<_Duration>& __s) | |
2453 | : _M_date(chrono::floor<days>(__s)), _M_time(__s - _M_date) | |
2454 | { | |
2455 | ++_M_time._M_s; | |
2456 | } | |
2457 | ||
2458 | sys_days _M_date; | |
2459 | hh_mm_ss<common_type_t<_Duration, days>> _M_time; | |
2460 | }; | |
2461 | } | |
2462 | /// @endcond | |
2463 | ||
03d5044b PP |
2464 | // 12/24 HOURS FUNCTIONS |
2465 | ||
2466 | constexpr bool | |
2467 | is_am(const hours& __h) noexcept | |
2468 | { return 0h <= __h && __h <= 11h; } | |
2469 | ||
2470 | constexpr bool | |
2471 | is_pm(const hours& __h) noexcept | |
2472 | { return 12h <= __h && __h <= 23h; } | |
2473 | ||
2474 | constexpr hours | |
2475 | make12(const hours& __h) noexcept | |
2476 | { | |
2477 | if (__h == 0h) | |
2478 | return 12h; | |
2479 | else if (__h > 12h) | |
2480 | return __h - 12h; | |
2481 | return __h; | |
2482 | } | |
2483 | ||
2484 | constexpr hours | |
2485 | make24(const hours& __h, bool __is_pm) noexcept | |
2486 | { | |
2487 | if (!__is_pm) | |
2488 | { | |
2489 | if (__h == 12h) | |
2490 | return 0h; | |
2491 | else | |
2492 | return __h; | |
2493 | } | |
2494 | else | |
2495 | { | |
2496 | if (__h == 12h) | |
2497 | return __h; | |
2498 | else | |
2499 | return __h + 12h; | |
2500 | } | |
2501 | } | |
1736bf5a | 2502 | |
9fc61d45 | 2503 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
1736bf5a JW |
2504 | // C++20 [time.zones] Time zones |
2505 | ||
9fc61d45 JW |
2506 | struct tzdb; |
2507 | ||
1736bf5a JW |
2508 | struct sys_info |
2509 | { | |
2510 | sys_seconds begin; | |
2511 | sys_seconds end; | |
2512 | seconds offset; | |
2513 | minutes save; | |
2514 | string abbrev; | |
2515 | }; | |
2516 | ||
2517 | struct local_info | |
2518 | { | |
2519 | static constexpr int unique = 0; | |
2520 | static constexpr int nonexistent = 1; | |
2521 | static constexpr int ambiguous = 2; | |
2522 | ||
2523 | int result; | |
2524 | sys_info first; | |
2525 | sys_info second; | |
2526 | }; | |
2527 | ||
2528 | class nonexistent_local_time : public runtime_error | |
2529 | { | |
2530 | public: | |
2531 | template<typename _Duration> | |
2532 | nonexistent_local_time(const local_time<_Duration>& __tp, | |
2533 | const local_info& __i) | |
2534 | : runtime_error(_S_make_what_str(__tp, __i)) | |
2535 | { __glibcxx_assert(__i.result == local_info::nonexistent); } | |
2536 | ||
2537 | private: | |
9fc61d45 | 2538 | template<typename _Duration> |
1736bf5a | 2539 | static string |
9fc61d45 JW |
2540 | _S_make_what_str(const local_time<_Duration>& __tp, |
2541 | const local_info& __i) | |
2542 | { | |
9fc61d45 JW |
2543 | std::ostringstream __os; |
2544 | __os << __tp << " is in a gap between\n" | |
2545 | << local_seconds(__i.first.end.time_since_epoch()) | |
2546 | + __i.first.offset << ' ' << __i.first.abbrev << " and\n" | |
2547 | << local_seconds(__i.second.begin.time_since_epoch()) | |
2548 | + __i.second.offset << ' ' << __i.second.abbrev | |
2549 | << " which are both equivalent to\n" | |
2550 | << __i.first.end << " UTC"; | |
2551 | return std::move(__os).str(); | |
9fc61d45 | 2552 | } |
1736bf5a JW |
2553 | }; |
2554 | ||
2555 | class ambiguous_local_time : public runtime_error | |
2556 | { | |
2557 | public: | |
2558 | template<typename _Duration> | |
2559 | ambiguous_local_time(const local_time<_Duration>& __tp, | |
9fc61d45 | 2560 | const local_info& __i) |
1736bf5a | 2561 | : runtime_error(_S_make_what_str(__tp, __i)) |
9fc61d45 | 2562 | { __glibcxx_assert(__i.result == local_info::ambiguous); } |
1736bf5a JW |
2563 | |
2564 | private: | |
9fc61d45 | 2565 | template<typename _Duration> |
1736bf5a | 2566 | static string |
9fc61d45 JW |
2567 | _S_make_what_str(const local_time<_Duration>& __tp, |
2568 | const local_info& __i) | |
2569 | { | |
9fc61d45 JW |
2570 | std::ostringstream __os; |
2571 | __os << __tp << " is ambiguous. It could be\n" | |
2572 | << __tp << ' ' << __i.first.abbrev << " == " | |
2573 | << __tp - __i.first.offset << " UTC or\n" | |
2574 | << __tp << ' ' << __i.second.abbrev << " == " | |
2575 | << __tp - __i.second.offset << " UTC"; | |
2576 | return std::move(__os).str(); | |
9fc61d45 | 2577 | } |
1736bf5a JW |
2578 | }; |
2579 | ||
9fc61d45 JW |
2580 | template<typename _Duration> |
2581 | [[noreturn]] void | |
2582 | __throw_bad_local_time(const local_time<_Duration>& __tp, | |
2583 | const local_info& __i) | |
2584 | { | |
2585 | #if __cpp_exceptions | |
2586 | if (__i.result == local_info::nonexistent) | |
2587 | throw nonexistent_local_time(__tp, __i); | |
2588 | throw ambiguous_local_time(__tp, __i); | |
2589 | #else | |
2590 | __builtin_abort(); | |
2591 | #endif | |
2592 | } | |
2593 | ||
1736bf5a JW |
2594 | enum class choose { earliest, latest }; |
2595 | ||
2596 | class time_zone | |
2597 | { | |
2598 | public: | |
2599 | time_zone(time_zone&&) = default; | |
2600 | time_zone& operator=(time_zone&&) = default; | |
2601 | ||
9fc61d45 JW |
2602 | ~time_zone(); |
2603 | ||
2604 | [[nodiscard]] | |
1736bf5a JW |
2605 | string_view name() const noexcept { return _M_name; } |
2606 | ||
2607 | template<typename _Duration> | |
2608 | sys_info | |
9fc61d45 JW |
2609 | get_info(const sys_time<_Duration>& __st) const |
2610 | { return _M_get_sys_info(chrono::floor<seconds>(__st)); } | |
1736bf5a JW |
2611 | |
2612 | template<typename _Duration> | |
2613 | local_info | |
9fc61d45 JW |
2614 | get_info(const local_time<_Duration>& __tp) const |
2615 | { return _M_get_local_info(chrono::floor<seconds>(__tp)); } | |
1736bf5a JW |
2616 | |
2617 | template<typename _Duration> | |
2618 | sys_time<common_type_t<_Duration, seconds>> | |
9fc61d45 JW |
2619 | to_sys(const local_time<_Duration>& __tp) const |
2620 | { | |
2621 | local_info __info = get_info(__tp); | |
2622 | ||
2623 | if (__info.result != local_info::unique) | |
2624 | __throw_bad_local_time(__tp, __info); | |
2625 | ||
2626 | return sys_time<_Duration>(__tp.time_since_epoch()) | |
2627 | - __info.first.offset; | |
2628 | } | |
1736bf5a JW |
2629 | |
2630 | template<typename _Duration> | |
2631 | sys_time<common_type_t<_Duration, seconds>> | |
9fc61d45 JW |
2632 | to_sys(const local_time<_Duration>& __tp, choose __z) const |
2633 | { | |
2634 | local_info __info = get_info(__tp); | |
2635 | ||
2636 | if (__info.result == local_info::nonexistent) | |
2637 | return __info.first.end; // Last second of the previous sys_info. | |
2638 | ||
2639 | sys_time<_Duration> __st(__tp.time_since_epoch()); | |
2640 | ||
2641 | if (__info.result == local_info::ambiguous && __z == choose::latest) | |
2642 | return __st - __info.second.offset; // Time in the later sys_info. | |
2643 | // else if __z == earliest, use __info.first.offset as below: | |
2644 | ||
2645 | return __st - __info.first.offset; | |
2646 | } | |
1736bf5a JW |
2647 | |
2648 | template<typename _Duration> | |
2649 | local_time<common_type_t<_Duration, seconds>> | |
9fc61d45 JW |
2650 | to_local(const sys_time<_Duration>& __tp) const |
2651 | { | |
2652 | auto __d = (__tp + get_info(__tp).offset).time_since_epoch(); | |
2653 | return local_time<common_type_t<_Duration, seconds>>(__d); | |
2654 | } | |
1736bf5a | 2655 | |
9fc61d45 | 2656 | [[nodiscard]] friend bool |
1736bf5a | 2657 | operator==(const time_zone& __x, const time_zone& __y) noexcept |
9fc61d45 | 2658 | { return __x._M_name == __y._M_name; } |
1736bf5a | 2659 | |
9fc61d45 | 2660 | [[nodiscard]] friend strong_ordering |
1736bf5a | 2661 | operator<=>(const time_zone& __x, const time_zone& __y) noexcept |
9fc61d45 | 2662 | { return __x._M_name <=> __y._M_name; } |
1736bf5a JW |
2663 | |
2664 | private: | |
9fc61d45 JW |
2665 | sys_info _M_get_sys_info(sys_seconds) const; |
2666 | local_info _M_get_local_info(local_seconds) const; | |
2667 | ||
2668 | friend const tzdb& reload_tzdb(); | |
2669 | friend struct tzdb; | |
2670 | friend class tzdb_list; | |
2671 | ||
1736bf5a | 2672 | struct _Impl; |
9fc61d45 JW |
2673 | |
2674 | explicit time_zone(unique_ptr<_Impl> __p); | |
2675 | string _M_name; | |
1736bf5a JW |
2676 | unique_ptr<_Impl> _M_impl; |
2677 | }; | |
2678 | ||
1736bf5a JW |
2679 | const time_zone* locate_zone(string_view __tz_name); |
2680 | const time_zone* current_zone(); | |
2681 | ||
9fc61d45 JW |
2682 | /** The list of `chrono::tzdb` objects |
2683 | * | |
2684 | * A single object of this type is constructed by the C++ runtime, | |
2685 | * and can be accessed by calling `chrono::get_tzdb_list()`. | |
2686 | * | |
2687 | * The front of the list is the current `tzdb` object and can be accessed | |
2688 | * via `chrono::get_tzdb_list().front()` or `chrono::get_tzdb()` or | |
2689 | * `*chrono::get_tzdb_list().begin()`. | |
2690 | * | |
2691 | * The `chrono::reload_tzdb()` function will check for a newer version | |
2692 | * and if found, insert it at the front of the list. | |
2693 | * | |
2694 | * @since C++20 | |
2695 | */ | |
2696 | class tzdb_list | |
2697 | { | |
2698 | struct _Node; | |
2699 | ||
2700 | public: | |
2701 | tzdb_list(const tzdb_list&) = delete; | |
2702 | tzdb_list& operator=(const tzdb_list&) = delete; | |
2703 | ||
2704 | /** An iterator into the `tzdb_list` | |
2705 | * | |
2706 | * As a extension, in libstdc++ each `tzdb` is reference-counted | |
2707 | * and the `const_iterator` type shares ownership of the object it | |
2708 | * refers to. This ensures that a `tzdb` erased from the list will | |
2709 | * not be destroyed while there is an iterator that refers to it. | |
2710 | */ | |
2711 | class const_iterator | |
2712 | { | |
2713 | public: | |
2714 | using value_type = tzdb; | |
2715 | using reference = const tzdb&; | |
2716 | using pointer = const tzdb*; | |
2717 | using difference_type = ptrdiff_t; | |
2718 | using iterator_category = forward_iterator_tag; | |
2719 | ||
2720 | constexpr const_iterator() = default; | |
2721 | const_iterator(const const_iterator&) = default; | |
2722 | const_iterator(const_iterator&&) = default; | |
2723 | const_iterator& operator=(const const_iterator&) = default; | |
2724 | const_iterator& operator=(const_iterator&&) = default; | |
2725 | ||
2726 | reference operator*() const noexcept; | |
2727 | pointer operator->() const noexcept { return &**this; } | |
2728 | const_iterator& operator++(); | |
2729 | const_iterator operator++(int); | |
2730 | ||
2731 | bool operator==(const const_iterator&) const noexcept = default; | |
2732 | ||
2733 | private: | |
2734 | explicit const_iterator(const shared_ptr<_Node>&) noexcept; | |
2735 | ||
2736 | friend class tzdb_list; | |
2737 | ||
2738 | shared_ptr<_Node> _M_node; | |
2739 | void* _M_reserved = nullptr; | |
2740 | }; | |
2741 | ||
2742 | /** Access the current `tzdb` at the front of the list. | |
2743 | * | |
2744 | * This returns a reference to the same object as `chrono::get_tzdb()`. | |
2745 | * | |
2746 | * @returns A reference to the current tzdb object. | |
2747 | * @since C++20 | |
2748 | */ | |
2749 | const tzdb& front() const noexcept; | |
2750 | ||
2751 | /** Remove the tzdb object _after_ the one the iterator refers to. | |
2752 | * | |
2753 | * Calling this function concurently with any of `front()`, `begin()`, | |
2754 | * or `end()` does not cause a data race, but in general this function | |
2755 | * is not thread-safe. The behaviour may be undefined if erasing an | |
2756 | * element from the list while another thread is calling the same | |
2757 | * function, or incrementing an iterator into the list, or accessing | |
2758 | * the element being erased (unless it is accessed through an iterator). | |
2759 | * | |
2760 | * @param __p A dereferenceable iterator. | |
2761 | * @returns An iterator the element after the one that was erased | |
2762 | * (or `end()` if there is no such element). | |
2763 | * @since C++20 | |
2764 | */ | |
2765 | const_iterator erase_after(const_iterator __p); | |
2766 | ||
2767 | const_iterator begin() const noexcept; | |
2768 | const_iterator end() const noexcept { return {}; } | |
2769 | const_iterator cbegin() const noexcept { return begin(); } | |
2770 | const_iterator cend() const noexcept { return end(); } | |
2771 | ||
2772 | private: | |
2773 | constexpr explicit tzdb_list(nullptr_t); | |
2774 | ||
2775 | friend tzdb_list& get_tzdb_list(); | |
2776 | friend const tzdb& get_tzdb(); | |
2777 | friend const tzdb& reload_tzdb(); | |
2778 | friend struct tzdb; | |
2779 | friend class leap_second; | |
2780 | friend struct time_zone::_Impl; | |
2781 | friend class time_zone_link; | |
2782 | }; | |
2783 | ||
1736bf5a JW |
2784 | class time_zone_link |
2785 | { | |
2786 | public: | |
2787 | time_zone_link(time_zone_link&&) = default; | |
2788 | time_zone_link& operator=(time_zone_link&&) = default; | |
2789 | ||
2790 | string_view name() const noexcept { return _M_name; } | |
2791 | string_view target() const noexcept { return _M_target; } | |
2792 | ||
2793 | friend bool | |
2794 | operator==(const time_zone_link& __x, const time_zone_link& __y) noexcept | |
2795 | { return __x.name() == __y.name(); } | |
2796 | ||
2797 | friend strong_ordering | |
2798 | operator<=>(const time_zone_link& __x, const time_zone_link& __y) noexcept | |
2799 | { return __x.name() <=> __y.name(); } | |
2800 | ||
2801 | private: | |
2802 | friend const tzdb& reload_tzdb(); | |
9fc61d45 JW |
2803 | friend class tzdb_list::_Node; |
2804 | ||
2805 | explicit time_zone_link(nullptr_t) { } | |
2806 | ||
1736bf5a JW |
2807 | string _M_name; |
2808 | string _M_target; | |
2809 | }; | |
2810 | ||
2811 | class leap_second | |
2812 | { | |
2813 | public: | |
2814 | leap_second(const leap_second&) = default; | |
2815 | leap_second& operator=(const leap_second&) = default; | |
2816 | ||
ec8f914f | 2817 | [[nodiscard]] |
1736bf5a JW |
2818 | constexpr sys_seconds |
2819 | date() const noexcept | |
2820 | { | |
2821 | if (_M_s >= _M_s.zero()) [[likely]] | |
2822 | return sys_seconds(_M_s); | |
2823 | return sys_seconds(-_M_s); | |
2824 | } | |
2825 | ||
ec8f914f | 2826 | [[nodiscard]] |
1736bf5a JW |
2827 | constexpr seconds |
2828 | value() const noexcept | |
2829 | { | |
2830 | if (_M_s >= _M_s.zero()) [[likely]] | |
2831 | return seconds(1); | |
2832 | return seconds(-1); | |
2833 | } | |
2834 | ||
2835 | // This can be defaulted because the database will never contain two | |
2836 | // leap_second objects with the same date but different signs. | |
ec8f914f | 2837 | [[nodiscard]] friend constexpr bool |
1736bf5a JW |
2838 | operator==(const leap_second&, const leap_second&) noexcept = default; |
2839 | ||
ec8f914f | 2840 | [[nodiscard]] friend constexpr strong_ordering |
1736bf5a JW |
2841 | operator<=>(const leap_second& __x, const leap_second& __y) noexcept |
2842 | { return __x.date() <=> __y.date(); } | |
2843 | ||
2844 | template<typename _Duration> | |
ec8f914f | 2845 | [[nodiscard]] friend constexpr bool |
1736bf5a JW |
2846 | operator==(const leap_second& __x, |
2847 | const sys_time<_Duration>& __y) noexcept | |
2848 | { return __x.date() == __y; } | |
2849 | ||
2850 | template<typename _Duration> | |
ec8f914f | 2851 | [[nodiscard]] friend constexpr bool |
1736bf5a JW |
2852 | operator<(const leap_second& __x, |
2853 | const sys_time<_Duration>& __y) noexcept | |
2854 | { return __x.date() < __y; } | |
2855 | ||
2856 | template<typename _Duration> | |
ec8f914f | 2857 | [[nodiscard]] friend constexpr bool |
1736bf5a JW |
2858 | operator<(const sys_time<_Duration>& __x, |
2859 | const leap_second& __y) noexcept | |
2860 | { return __x < __y.date(); } | |
2861 | ||
2862 | template<typename _Duration> | |
ec8f914f | 2863 | [[nodiscard]] friend constexpr bool |
1736bf5a JW |
2864 | operator>(const leap_second& __x, |
2865 | const sys_time<_Duration>& __y) noexcept | |
2866 | { return __y < __x.date(); } | |
2867 | ||
2868 | template<typename _Duration> | |
ec8f914f | 2869 | [[nodiscard]] friend constexpr bool |
1736bf5a JW |
2870 | operator>(const sys_time<_Duration>& __x, |
2871 | const leap_second& __y) noexcept | |
2872 | { return __y.date() < __x; } | |
2873 | ||
2874 | template<typename _Duration> | |
ec8f914f | 2875 | [[nodiscard]] friend constexpr bool |
1736bf5a | 2876 | operator<=(const leap_second& __x, |
ec8f914f | 2877 | const sys_time<_Duration>& __y) noexcept |
1736bf5a JW |
2878 | { return !(__y < __x.date()); } |
2879 | ||
2880 | template<typename _Duration> | |
ec8f914f | 2881 | [[nodiscard]] friend constexpr bool |
1736bf5a | 2882 | operator<=(const sys_time<_Duration>& __x, |
ec8f914f | 2883 | const leap_second& __y) noexcept |
1736bf5a JW |
2884 | { return !(__y.date() < __x); } |
2885 | ||
2886 | template<typename _Duration> | |
ec8f914f | 2887 | [[nodiscard]] friend constexpr bool |
1736bf5a | 2888 | operator>=(const leap_second& __x, |
ec8f914f | 2889 | const sys_time<_Duration>& __y) noexcept |
1736bf5a JW |
2890 | { return !(__x.date() < __y); } |
2891 | ||
2892 | template<typename _Duration> | |
ec8f914f | 2893 | [[nodiscard]] friend constexpr bool |
1736bf5a | 2894 | operator>=(const sys_time<_Duration>& __x, |
ec8f914f | 2895 | const leap_second& __y) noexcept |
1736bf5a JW |
2896 | { return !(__x < __y.date()); } |
2897 | ||
2898 | template<three_way_comparable_with<seconds> _Duration> | |
ec8f914f | 2899 | [[nodiscard]] friend constexpr auto |
1736bf5a | 2900 | operator<=>(const leap_second& __x, |
ec8f914f | 2901 | const sys_time<_Duration>& __y) noexcept |
1736bf5a JW |
2902 | { return __x.date() <=> __y; } |
2903 | ||
2904 | private: | |
2905 | explicit leap_second(seconds::rep __s) : _M_s(__s) { } | |
2906 | ||
9fc61d45 JW |
2907 | friend class tzdb_list::_Node; |
2908 | ||
1736bf5a | 2909 | friend const tzdb& reload_tzdb(); |
9fc61d45 JW |
2910 | |
2911 | template<typename _Duration> | |
1736bf5a | 2912 | friend leap_second_info |
9fc61d45 | 2913 | get_leap_second_info(const utc_time<_Duration>&); |
1736bf5a JW |
2914 | |
2915 | seconds _M_s; // == date().time_since_epoch() * value().count() | |
2916 | }; | |
2917 | ||
2918 | template<class _Tp> struct zoned_traits { }; | |
2919 | ||
2920 | template<> | |
2921 | struct zoned_traits<const time_zone*> | |
2922 | { | |
2923 | static const time_zone* | |
2924 | default_zone() | |
2925 | { return std::chrono::locate_zone("UTC"); } | |
2926 | ||
2927 | static const time_zone* | |
2928 | locate_zone(string_view __name) | |
2929 | { return std::chrono::locate_zone(__name); } | |
2930 | }; | |
2931 | ||
2932 | struct tzdb | |
2933 | { | |
2934 | string version; | |
9fc61d45 JW |
2935 | _GLIBCXX_STD_C::vector<time_zone> zones; |
2936 | _GLIBCXX_STD_C::vector<time_zone_link> links; | |
2937 | _GLIBCXX_STD_C::vector<leap_second> leap_seconds; | |
1736bf5a JW |
2938 | |
2939 | const time_zone* | |
2940 | locate_zone(string_view __tz_name) const; | |
2941 | ||
2942 | const time_zone* | |
2943 | current_zone() const; | |
2944 | ||
2945 | private: | |
2946 | friend const tzdb& reload_tzdb(); | |
9fc61d45 JW |
2947 | friend class time_zone; |
2948 | friend class tzdb_list::_Node; | |
1736bf5a JW |
2949 | }; |
2950 | ||
9fc61d45 JW |
2951 | tzdb_list& get_tzdb_list(); |
2952 | const tzdb& get_tzdb(); | |
1736bf5a | 2953 | |
9fc61d45 JW |
2954 | const tzdb& reload_tzdb(); |
2955 | string remote_version(); | |
2956 | ||
2957 | template<typename _Duration, typename _TimeZonePtr = const time_zone*> | |
2958 | class zoned_time | |
1736bf5a | 2959 | { |
9fc61d45 JW |
2960 | static_assert(__is_duration_v<_Duration>); |
2961 | ||
2962 | using _Traits = zoned_traits<_TimeZonePtr>; | |
2963 | ||
2964 | // Every constructor that accepts a string_view as its first parameter | |
2965 | // does not participate in class template argument deduction. | |
2966 | using string_view = type_identity_t<std::string_view>; | |
2967 | ||
1736bf5a | 2968 | public: |
9fc61d45 | 2969 | using duration = common_type_t<_Duration, seconds>; |
1736bf5a | 2970 | |
9fc61d45 JW |
2971 | zoned_time() requires requires { _Traits::default_zone(); } |
2972 | { } | |
1736bf5a | 2973 | |
9fc61d45 JW |
2974 | zoned_time(const zoned_time&) = default; |
2975 | zoned_time& operator=(const zoned_time&) = default; | |
1736bf5a | 2976 | |
9fc61d45 JW |
2977 | zoned_time(const sys_time<_Duration>& __st) |
2978 | requires requires { _Traits::default_zone(); } | |
2979 | : _M_tp(__st) | |
2980 | { } | |
1736bf5a | 2981 | |
9fc61d45 JW |
2982 | explicit |
2983 | zoned_time(_TimeZonePtr __z) : _M_zone(std::move(__z)) { } | |
1736bf5a | 2984 | |
9fc61d45 JW |
2985 | explicit |
2986 | zoned_time(string_view __name) | |
2987 | requires requires { | |
2988 | _TimeZonePtr{_Traits::locate_zone(std::string_view{})}; | |
2989 | } | |
2990 | : _M_zone(_Traits::locate_zone(__name)) | |
2991 | { } | |
1736bf5a | 2992 | |
9fc61d45 JW |
2993 | template<typename _Duration2> |
2994 | zoned_time(const zoned_time<_Duration2, _TimeZonePtr>& __zt) | |
2995 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
2996 | : _M_zone(__zt._M_zone), _M_tp(__zt._M_tp) | |
2997 | { } | |
1736bf5a | 2998 | |
9fc61d45 JW |
2999 | zoned_time(_TimeZonePtr __z, const sys_time<_Duration>& __st) |
3000 | : _M_zone(std::move(__z)), _M_tp(__st) | |
3001 | { } | |
1736bf5a | 3002 | |
9fc61d45 JW |
3003 | zoned_time(string_view __name, const sys_time<_Duration>& __st) |
3004 | : zoned_time(_Traits::locate_zone(__name), __st) | |
3005 | { } | |
1736bf5a | 3006 | |
9fc61d45 JW |
3007 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp) |
3008 | requires requires { | |
3009 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; | |
3010 | } | |
3011 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp)) | |
3012 | { } | |
1736bf5a | 3013 | |
9fc61d45 JW |
3014 | zoned_time(string_view __name, const local_time<_Duration>& __tp) |
3015 | requires requires (_TimeZonePtr __z) { | |
3016 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3017 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; | |
3018 | } | |
3019 | : zoned_time(_Traits::locate_zone(__name), __tp) | |
3020 | { } | |
1736bf5a | 3021 | |
9fc61d45 JW |
3022 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp, |
3023 | choose __c) | |
3024 | requires requires { | |
3025 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; | |
3026 | } | |
3027 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp, __c)) | |
3028 | { } | |
1736bf5a | 3029 | |
9fc61d45 JW |
3030 | zoned_time(string_view __name, const local_time<_Duration>& __tp, |
3031 | choose __c) | |
3032 | requires requires (_TimeZonePtr __z) { | |
3033 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3034 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; | |
3035 | } | |
3036 | : _M_zone(_Traits::locate_zone(__name)), | |
3037 | _M_tp(_M_zone->to_sys(__tp, __c)) | |
3038 | { } | |
1736bf5a | 3039 | |
9fc61d45 JW |
3040 | template<typename _Duration2, typename _TimeZonePtr2> |
3041 | zoned_time(_TimeZonePtr __z, | |
3042 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) | |
3043 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3044 | : _M_zone(__z), _M_tp(__zt._M_tp) | |
3045 | { } | |
3046 | ||
3047 | template<typename _Duration2, typename _TimeZonePtr2> | |
3048 | zoned_time(_TimeZonePtr __z, | |
3049 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, | |
3050 | choose __c) | |
3051 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3052 | : _M_zone(__z), _M_tp(__zt._M_tp) | |
3053 | { } | |
3054 | ||
3055 | template<typename _Duration2, typename _TimeZonePtr2> | |
3056 | zoned_time(string_view __name, | |
3057 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) | |
3058 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3059 | && requires { | |
3060 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3061 | } | |
3062 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) | |
3063 | { } | |
3064 | ||
3065 | template<typename _Duration2, typename _TimeZonePtr2> | |
3066 | zoned_time(string_view __name, | |
3067 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, | |
3068 | choose __c) | |
3069 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> | |
3070 | && requires { | |
3071 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; | |
3072 | } | |
3073 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) | |
3074 | { } | |
1736bf5a | 3075 | |
9fc61d45 JW |
3076 | zoned_time& |
3077 | operator=(const sys_time<_Duration>& __st) | |
3078 | { | |
3079 | _M_tp = __st; | |
3080 | return *this; | |
3081 | } | |
3082 | ||
3083 | zoned_time& | |
3084 | operator=(const local_time<_Duration>& __lt) | |
3085 | { | |
3086 | _M_tp = _M_zone->to_sys(__lt); | |
3087 | return *this; | |
3088 | } | |
3089 | ||
3090 | [[nodiscard]] | |
3091 | operator sys_time<duration>() const { return _M_tp; } | |
3092 | ||
3093 | [[nodiscard]] | |
3094 | explicit operator local_time<duration>() const | |
3095 | { return get_local_time(); } | |
3096 | ||
3097 | [[nodiscard]] | |
3098 | _TimeZonePtr | |
3099 | get_time_zone() const | |
3100 | { return _M_zone; } | |
3101 | ||
3102 | [[nodiscard]] | |
3103 | local_time<duration> | |
3104 | get_local_time() const | |
3105 | { return _M_zone->to_local(_M_tp); } | |
3106 | ||
3107 | [[nodiscard]] | |
3108 | sys_time<duration> | |
3109 | get_sys_time() const | |
3110 | { return _M_tp; } | |
3111 | ||
3112 | [[nodiscard]] | |
3113 | sys_info | |
3114 | get_info() const | |
3115 | { return _M_zone->get_info(_M_tp); } | |
3116 | ||
3117 | [[nodiscard]] friend bool | |
3118 | operator==(const zoned_time&, const zoned_time&) = default; | |
3119 | ||
3120 | private: | |
3121 | _TimeZonePtr _M_zone{ _Traits::default_zone() }; | |
3122 | sys_time<duration> _M_tp{}; | |
3123 | ||
3124 | template<typename _Duration2, typename _TimeZonePtr2> | |
3125 | friend class zoned_time; | |
3126 | }; | |
3127 | ||
3128 | zoned_time() -> zoned_time<seconds>; | |
3129 | ||
3130 | template<typename _Duration> | |
3131 | zoned_time(sys_time<_Duration>) | |
3132 | -> zoned_time<common_type_t<_Duration, seconds>>; | |
3133 | ||
3134 | /// @cond undocumented | |
3135 | template<typename _TimeZonePtrOrName> | |
3136 | using __time_zone_representation | |
3137 | = __conditional_t<is_convertible_v<_TimeZonePtrOrName, string_view>, | |
3138 | const time_zone*, | |
3139 | remove_cvref_t<_TimeZonePtrOrName>>; | |
3140 | /// @endcond | |
3141 | ||
3142 | template<typename _TimeZonePtrOrName> | |
3143 | zoned_time(_TimeZonePtrOrName&&) | |
3144 | -> zoned_time<seconds, __time_zone_representation<_TimeZonePtrOrName>>; | |
3145 | ||
3146 | template<typename _TimeZonePtrOrName, typename _Duration> | |
3147 | zoned_time(_TimeZonePtrOrName&&, sys_time<_Duration>) | |
3148 | -> zoned_time<common_type_t<_Duration, seconds>, | |
3149 | __time_zone_representation<_TimeZonePtrOrName>>; | |
3150 | ||
3151 | template<typename _TimeZonePtrOrName, typename _Duration> | |
3152 | zoned_time(_TimeZonePtrOrName&&, local_time<_Duration>, | |
3153 | choose = choose::earliest) | |
3154 | -> zoned_time<common_type_t<_Duration, seconds>, | |
3155 | __time_zone_representation<_TimeZonePtrOrName>>; | |
3156 | ||
3157 | template<typename _Duration, typename _TimeZonePtrOrName, | |
3158 | typename _TimeZonePtr2> | |
3159 | zoned_time(_TimeZonePtrOrName&&, zoned_time<_Duration, _TimeZonePtr2>, | |
3160 | choose = choose::earliest) | |
3161 | -> zoned_time<common_type_t<_Duration, seconds>, | |
3162 | __time_zone_representation<_TimeZonePtrOrName>>; | |
3163 | ||
3164 | template<typename _Dur1, typename _TZPtr1, typename _Dur2, typename _TZPtr2> | |
3165 | [[nodiscard]] | |
3166 | inline bool | |
3167 | operator==(const zoned_time<_Dur1, _TZPtr1>& __x, | |
3168 | const zoned_time<_Dur2, _TZPtr2>& __y) | |
3169 | { | |
3170 | return __x.get_time_zone() == __y.get_time_zone() | |
3171 | && __x.get_sys_time() == __y.get_sys_time(); | |
3172 | } | |
1736bf5a JW |
3173 | |
3174 | using zoned_seconds = zoned_time<seconds>; | |
9fc61d45 JW |
3175 | #endif // _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
3176 | ||
3177 | namespace __detail | |
3178 | { | |
3179 | inline leap_second_info | |
3180 | __get_leap_second_info(sys_seconds __ss, bool __is_utc) | |
3181 | { | |
3182 | if (__ss < sys_seconds{}) [[unlikely]] | |
3183 | return {}; | |
3184 | ||
3185 | const seconds::rep __leaps[] { | |
3186 | 78796800, // 1 Jul 1972 | |
3187 | 94694400, // 1 Jan 1973 | |
3188 | 126230400, // 1 Jan 1974 | |
3189 | 157766400, // 1 Jan 1975 | |
3190 | 189302400, // 1 Jan 1976 | |
3191 | 220924800, // 1 Jan 1977 | |
3192 | 252460800, // 1 Jan 1978 | |
3193 | 283996800, // 1 Jan 1979 | |
3194 | 315532800, // 1 Jan 1980 | |
3195 | 362793600, // 1 Jul 1981 | |
3196 | 394329600, // 1 Jul 1982 | |
3197 | 425865600, // 1 Jul 1983 | |
3198 | 489024000, // 1 Jul 1985 | |
3199 | 567993600, // 1 Jan 1988 | |
3200 | 631152000, // 1 Jan 1990 | |
3201 | 662688000, // 1 Jan 1991 | |
3202 | 709948800, // 1 Jul 1992 | |
3203 | 741484800, // 1 Jul 1993 | |
3204 | 773020800, // 1 Jul 1994 | |
3205 | 820454400, // 1 Jan 1996 | |
3206 | 867715200, // 1 Jul 1997 | |
3207 | 915148800, // 1 Jan 1999 | |
3208 | 1136073600, // 1 Jan 2006 | |
3209 | 1230768000, // 1 Jan 2009 | |
3210 | 1341100800, // 1 Jul 2012 | |
3211 | 1435708800, // 1 Jul 2015 | |
3212 | 1483228800, // 1 Jan 2017 | |
3213 | }; | |
3214 | // The list above is known to be valid until (at least) this date | |
3215 | // and only contains positive leap seconds. | |
cf19ef9e | 3216 | const sys_seconds __expires(1703721600s); // 2023-12-28 00:00:00 UTC |
9fc61d45 JW |
3217 | |
3218 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI | |
3219 | if (__ss > __expires) | |
3220 | { | |
3221 | // Use updated leap_seconds from tzdb. | |
3222 | size_t __n = std::size(__leaps); | |
3223 | ||
3224 | auto __db = get_tzdb_list().begin(); | |
3225 | auto __first = __db->leap_seconds.begin() + __n; | |
3226 | auto __last = __db->leap_seconds.end(); | |
3227 | auto __pos = std::upper_bound(__first, __last, __ss); | |
3228 | seconds __elapsed(__n); | |
3229 | for (auto __i = __first; __i != __pos; ++__i) | |
3230 | __elapsed += __i->value(); | |
3231 | ||
3232 | if (__is_utc) | |
3233 | { | |
3234 | // Convert utc_time to sys_time: | |
3235 | __ss -= __elapsed; | |
3236 | // See if that sys_time is before (or during) previous leap sec: | |
3237 | if (__pos != __first && __ss < __pos[-1]) | |
3238 | { | |
3239 | if ((__ss + 1s) >= __pos[-1]) | |
3240 | return {true, __elapsed}; | |
3241 | __elapsed -= __pos[-1].value(); | |
3242 | } | |
3243 | } | |
3244 | return {false, __elapsed}; | |
3245 | } | |
3246 | else | |
3247 | #endif | |
3248 | { | |
3249 | seconds::rep __s = __ss.time_since_epoch().count(); | |
3250 | const seconds::rep* __first = std::begin(__leaps); | |
3251 | const seconds::rep* __last = std::end(__leaps); | |
3252 | ||
3253 | // Don't bother searching the list if we're after the last one. | |
3254 | if (__s > (__last[-1] + (__last - __first) + 1)) | |
3255 | return { false, seconds(__last - __first) }; | |
3256 | ||
3257 | auto __pos = std::upper_bound(__first, __last, __s); | |
3258 | seconds __elapsed{__pos - __first}; | |
3259 | if (__is_utc) | |
3260 | { | |
3261 | // Convert utc_time to sys_time: | |
3262 | __s -= __elapsed.count(); | |
3263 | // See if that sys_time is before (or during) previous leap sec: | |
3264 | if (__pos != __first && __s < __pos[-1]) | |
3265 | { | |
3266 | if ((__s + 1) >= __pos[-1]) | |
3267 | return {true, __elapsed}; | |
3268 | --__elapsed; | |
3269 | } | |
3270 | } | |
3271 | return {false, __elapsed}; | |
3272 | } | |
3273 | } | |
3274 | } // namespace __detail | |
1736bf5a JW |
3275 | |
3276 | template<typename _Duration> | |
9fc61d45 JW |
3277 | [[nodiscard]] |
3278 | inline leap_second_info | |
1736bf5a JW |
3279 | get_leap_second_info(const utc_time<_Duration>& __ut) |
3280 | { | |
9fc61d45 JW |
3281 | auto __s = chrono::duration_cast<seconds>(__ut.time_since_epoch()); |
3282 | return __detail::__get_leap_second_info(sys_seconds(__s), true); | |
3283 | } | |
1736bf5a | 3284 | |
9fc61d45 JW |
3285 | template<typename _Duration> |
3286 | [[nodiscard]] | |
3287 | inline utc_time<common_type_t<_Duration, seconds>> | |
3288 | utc_clock::from_sys(const sys_time<_Duration>& __t) | |
3289 | { | |
3290 | using _CDur = common_type_t<_Duration, seconds>; | |
3291 | auto __s = chrono::time_point_cast<seconds>(__t); | |
3292 | const auto __li = __detail::__get_leap_second_info(__s, false); | |
3293 | return utc_time<_CDur>{__t.time_since_epoch()} + __li.elapsed; | |
1736bf5a JW |
3294 | } |
3295 | ||
f2ce64b5 | 3296 | /// @} group chrono |
7f78718b | 3297 | #endif // C++20 |
f2ce64b5 | 3298 | } // namespace chrono |
04f69fda | 3299 | |
7f78718b JW |
3300 | #if __cplusplus >= 202002L |
3301 | inline namespace literals | |
bf1fc37b | 3302 | { |
7f78718b JW |
3303 | inline namespace chrono_literals |
3304 | { | |
3305 | /// @addtogroup chrono | |
3306 | /// @{ | |
3307 | #pragma GCC diagnostic push | |
3308 | #pragma GCC diagnostic ignored "-Wliteral-suffix" | |
3309 | /// Literal suffix for creating chrono::day objects. | |
3310 | /// @since C++20 | |
3311 | constexpr chrono::day | |
3312 | operator""d(unsigned long long __d) noexcept | |
3313 | { return chrono::day{static_cast<unsigned>(__d)}; } | |
bf1fc37b | 3314 | |
7f78718b JW |
3315 | /// Literal suffix for creating chrono::year objects. |
3316 | /// @since C++20 | |
3317 | constexpr chrono::year | |
3318 | operator""y(unsigned long long __y) noexcept | |
3319 | { return chrono::year{static_cast<int>(__y)}; } | |
3320 | #pragma GCC diagnostic pop | |
3321 | /// @} | |
3322 | } // inline namespace chrono_literals | |
3323 | } // inline namespace literals | |
3324 | #endif // C++20 | |
88c4d6b7 | 3325 | |
4a15d842 | 3326 | _GLIBCXX_END_NAMESPACE_VERSION |
1c9f675f ESR |
3327 | } // namespace std |
3328 | ||
f99b9486 JW |
3329 | #if __cplusplus >= 202002L |
3330 | # include <bits/chrono_io.h> | |
3331 | #endif | |
3332 | ||
88c4d6b7 | 3333 | #endif // C++11 |
1c9f675f | 3334 | |
15e38d0d | 3335 | #endif //_GLIBCXX_CHRONO |