1 | // <chrono> -*- C++ -*- |
2 | |
3 | // Copyright (C) 2008-2023 Free Software Foundation, Inc. |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free |
6 | // software; you can redistribute it and/or modify it under the |
7 | // terms of the GNU General Public License as published by the |
8 | // Free Software Foundation; either version 3, or (at your option) |
9 | // any later version. |
10 | |
11 | // This library is distributed in the hope that it will be useful, |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | // GNU General Public License for more details. |
15 | |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version |
18 | // 3.1, as published by the Free Software Foundation. |
19 | |
20 | // You should have received a copy of the GNU General Public License and |
21 | // a copy of the GCC Runtime Library Exception along with this program; |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
23 | // <http://www.gnu.org/licenses/>. |
24 | |
25 | /** @file include/chrono |
26 | * This is a Standard C++ Library header. |
27 | * @ingroup chrono |
28 | */ |
29 | |
30 | #ifndef _GLIBCXX_CHRONO |
31 | #define _GLIBCXX_CHRONO 1 |
32 | |
33 | #pragma GCC system_header |
34 | |
35 | #include <bits/requires_hosted.h> // for <ctime> and clocks |
36 | |
37 | #if __cplusplus < 201103L |
38 | # include <bits/c++0x_warning.h> |
39 | #else |
40 | |
41 | #include <bits/chrono.h> |
42 | |
43 | #if __cplusplus >= 202002L |
44 | # include <bit> |
45 | # include <sstream> |
46 | # include <string> |
47 | # include <vector> |
48 | # include <bits/stl_algo.h> // upper_bound |
49 | # include <bits/shared_ptr.h> |
50 | # include <bits/unique_ptr.h> |
51 | #endif |
52 | |
53 | #if __cplusplus >= 202002L |
54 | // TODO formatting and parsing |
55 | // # undef __cpp_lib_chrono |
56 | // # define __cpp_lib_chrono 201907L |
57 | #endif |
58 | |
59 | namespace std _GLIBCXX_VISIBILITY(default) |
60 | { |
61 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
62 | |
63 | /** |
64 | * @defgroup chrono Time |
65 | * @ingroup utilities |
66 | * |
67 | * Classes and functions for time. |
68 | * |
69 | * @since C++11 |
70 | */ |
71 | |
72 | /** @namespace std::chrono |
73 | * @brief ISO C++ 2011 namespace for date and time utilities |
74 | * @ingroup chrono |
75 | */ |
76 | namespace chrono |
77 | { |
78 | #if __cplusplus >= 202002L |
79 | /// @addtogroup chrono |
80 | /// @{ |
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>; |
86 | |
87 | class utc_clock; |
88 | class tai_clock; |
89 | class gps_clock; |
90 | |
91 | template<typename _Duration> |
92 | using utc_time = time_point<utc_clock, _Duration>; |
93 | using utc_seconds = utc_time<seconds>; |
94 | |
95 | template<typename _Duration> |
96 | using tai_time = time_point<tai_clock, _Duration>; |
97 | using tai_seconds = tai_time<seconds>; |
98 | |
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 | |
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 | |
136 | [[nodiscard]] |
137 | static time_point |
138 | now() |
139 | { return from_sys(system_clock::now()); } |
140 | |
141 | template<typename _Duration> |
142 | [[nodiscard]] |
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); |
148 | sys_time<_CDur> __s{__t.time_since_epoch() - __li.elapsed}; |
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> |
155 | [[nodiscard]] |
156 | static utc_time<common_type_t<_Duration, seconds>> |
157 | from_sys(const sys_time<_Duration>& __t); |
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. |
176 | [[nodiscard]] |
177 | static time_point |
178 | now() |
179 | { return from_utc(utc_clock::now()); } |
180 | |
181 | template<typename _Duration> |
182 | [[nodiscard]] |
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> |
191 | [[nodiscard]] |
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. |
216 | [[nodiscard]] |
217 | static time_point |
218 | now() |
219 | { return from_utc(utc_clock::now()); } |
220 | |
221 | template<typename _Duration> |
222 | [[nodiscard]] |
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> |
231 | [[nodiscard]] |
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> |
405 | [[nodiscard]] |
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 | |
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 | // Helper to __add_modulo and __sub_modulo. |
507 | template <unsigned __d, typename _Tp> |
508 | consteval auto |
509 | __modulo_offset() |
510 | { |
511 | using _Up = make_unsigned_t<_Tp>; |
512 | auto constexpr __a = _Up(-1) - _Up(255 + __d - 2); |
513 | auto constexpr __b = _Up(__d * (__a / __d) - 1); |
514 | // Notice: b <= a - 1 <= _Up(-1) - (255 + d - 1) and b % d = d - 1. |
515 | return _Up(-1) - __b; // >= 255 + d - 1 |
516 | } |
517 | |
518 | // Compute the remainder of the Euclidean division of __x + __y divided by |
519 | // __d without overflowing. Typically, __x <= 255 + d - 1 is sum of |
520 | // weekday/month with a shift in [0, d - 1] and __y is a duration count. |
521 | template <unsigned __d, typename _Tp> |
522 | constexpr unsigned |
523 | __add_modulo(unsigned __x, _Tp __y) |
524 | { |
525 | using _Up = make_unsigned_t<_Tp>; |
526 | // For __y >= 0, _Up(__y) has the same mathematical value as __y and |
527 | // this function simply returns (__x + _Up(__y)) % d. Typically, this |
528 | // doesn't overflow since the range of _Up contains many more positive |
529 | // values than _Tp's. For __y < 0, _Up(__y) has a mathematical value in |
530 | // the upper-half range of _Up so that adding a positive value to it |
531 | // might overflow. Moreover, most likely, _Up(__y) != __y mod d. To |
532 | // fix both issues we subtract from _Up(__y) an __offset >= |
533 | // 255 + d - 1 to make room for the addition to __x and shift the modulo |
534 | // to the correct value. |
535 | auto const __offset = __y >= 0 ? _Up(0) : __modulo_offset<__d, _Tp>(); |
536 | return (__x + _Up(__y) - __offset) % __d; |
537 | } |
538 | |
539 | // Similar to __add_modulo but for __x - __y. |
540 | template <unsigned __d, typename _Tp> |
541 | constexpr unsigned |
542 | __sub_modulo(unsigned __x, _Tp __y) |
543 | { |
544 | using _Up = make_unsigned_t<_Tp>; |
545 | auto const __offset = __y <= 0 ? _Up(0) : __modulo_offset<__d, _Tp>(); |
546 | return (__x - _Up(__y) - __offset) % __d; |
547 | } |
548 | |
549 | inline constexpr unsigned __days_per_month[12] |
550 | = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; |
551 | } |
552 | |
553 | // DAY |
554 | |
555 | class day |
556 | { |
557 | private: |
558 | unsigned char _M_d; |
559 | |
560 | public: |
561 | day() = default; |
562 | |
563 | explicit constexpr |
564 | day(unsigned __d) noexcept |
565 | : _M_d(__d) |
566 | { } |
567 | |
568 | constexpr day& |
569 | operator++() noexcept |
570 | { |
571 | ++_M_d; |
572 | return *this; |
573 | } |
574 | |
575 | constexpr day |
576 | operator++(int) noexcept |
577 | { |
578 | auto __ret = *this; |
579 | ++(*this); |
580 | return __ret; |
581 | } |
582 | |
583 | constexpr day& |
584 | operator--() noexcept |
585 | { |
586 | --_M_d; |
587 | return *this; |
588 | } |
589 | |
590 | constexpr day |
591 | operator--(int) noexcept |
592 | { |
593 | auto __ret = *this; |
594 | --(*this); |
595 | return __ret; |
596 | } |
597 | |
598 | constexpr day& |
599 | operator+=(const days& __d) noexcept |
600 | { |
601 | *this = *this + __d; |
602 | return *this; |
603 | } |
604 | |
605 | constexpr day& |
606 | operator-=(const days& __d) noexcept |
607 | { |
608 | *this = *this - __d; |
609 | return *this; |
610 | } |
611 | |
612 | constexpr explicit |
613 | operator unsigned() const noexcept |
614 | { return _M_d; } |
615 | |
616 | constexpr bool |
617 | ok() const noexcept |
618 | { return 1 <= _M_d && _M_d <= 31; } |
619 | |
620 | friend constexpr bool |
621 | operator==(const day& __x, const day& __y) noexcept |
622 | { return unsigned{__x} == unsigned{__y}; } |
623 | |
624 | friend constexpr strong_ordering |
625 | operator<=>(const day& __x, const day& __y) noexcept |
626 | { return unsigned{__x} <=> unsigned{__y}; } |
627 | |
628 | friend constexpr day |
629 | operator+(const day& __x, const days& __y) noexcept |
630 | { return day(unsigned{__x} + __y.count()); } |
631 | |
632 | friend constexpr day |
633 | operator+(const days& __x, const day& __y) noexcept |
634 | { return __y + __x; } |
635 | |
636 | friend constexpr day |
637 | operator-(const day& __x, const days& __y) noexcept |
638 | { return __x + -__y; } |
639 | |
640 | friend constexpr days |
641 | operator-(const day& __x, const day& __y) noexcept |
642 | { return days{int(unsigned{__x}) - int(unsigned{__y})}; } |
643 | |
644 | friend constexpr month_day |
645 | operator/(const month& __m, const day& __d) noexcept; |
646 | |
647 | friend constexpr month_day |
648 | operator/(int __m, const day& __d) noexcept; |
649 | |
650 | friend constexpr month_day |
651 | operator/(const day& __d, const month& __m) noexcept; |
652 | |
653 | friend constexpr month_day |
654 | operator/(const day& __d, int __m) noexcept; |
655 | |
656 | friend constexpr year_month_day |
657 | operator/(const year_month& __ym, const day& __d) noexcept; |
658 | }; |
659 | |
660 | // MONTH |
661 | |
662 | class month |
663 | { |
664 | private: |
665 | unsigned char _M_m; |
666 | |
667 | public: |
668 | month() = default; |
669 | |
670 | explicit constexpr |
671 | month(unsigned __m) noexcept |
672 | : _M_m(__m) |
673 | { } |
674 | |
675 | constexpr month& |
676 | operator++() noexcept |
677 | { |
678 | *this += months{1}; |
679 | return *this; |
680 | } |
681 | |
682 | constexpr month |
683 | operator++(int) noexcept |
684 | { |
685 | auto __ret = *this; |
686 | ++(*this); |
687 | return __ret; |
688 | } |
689 | |
690 | constexpr month& |
691 | operator--() noexcept |
692 | { |
693 | *this -= months{1}; |
694 | return *this; |
695 | } |
696 | |
697 | constexpr month |
698 | operator--(int) noexcept |
699 | { |
700 | auto __ret = *this; |
701 | --(*this); |
702 | return __ret; |
703 | } |
704 | |
705 | constexpr month& |
706 | operator+=(const months& __m) noexcept |
707 | { |
708 | *this = *this + __m; |
709 | return *this; |
710 | } |
711 | |
712 | constexpr month& |
713 | operator-=(const months& __m) noexcept |
714 | { |
715 | *this = *this - __m; |
716 | return *this; |
717 | } |
718 | |
719 | explicit constexpr |
720 | operator unsigned() const noexcept |
721 | { return _M_m; } |
722 | |
723 | constexpr bool |
724 | ok() const noexcept |
725 | { return 1 <= _M_m && _M_m <= 12; } |
726 | |
727 | friend constexpr bool |
728 | operator==(const month& __x, const month& __y) noexcept |
729 | { return unsigned{__x} == unsigned{__y}; } |
730 | |
731 | friend constexpr strong_ordering |
732 | operator<=>(const month& __x, const month& __y) noexcept |
733 | { return unsigned{__x} <=> unsigned{__y}; } |
734 | |
735 | friend constexpr month |
736 | operator+(const month& __x, const months& __y) noexcept |
737 | { |
738 | // modulo(x + (y - 1), 12) = modulo(x + (y - 1) + 12, 12) |
739 | // = modulo((x + 11) + y , 12) |
740 | return month{1 + __detail::__add_modulo<12>( |
741 | unsigned{__x} + 11, __y.count())}; |
742 | } |
743 | |
744 | friend constexpr month |
745 | operator+(const months& __x, const month& __y) noexcept |
746 | { return __y + __x; } |
747 | |
748 | friend constexpr month |
749 | operator-(const month& __x, const months& __y) noexcept |
750 | { |
751 | // modulo(x + (-y - 1), 12) = modulo(x + (-y - 1) + 12, 12) |
752 | // = modulo((x + 11) - y , 12) |
753 | return month{1 + __detail::__sub_modulo<12>( |
754 | unsigned{__x} + 11, __y.count())}; |
755 | } |
756 | |
757 | friend constexpr months |
758 | operator-(const month& __x, const month& __y) noexcept |
759 | { |
760 | const auto __dm = int(unsigned(__x)) - int(unsigned(__y)); |
761 | return months{__dm < 0 ? 12 + __dm : __dm}; |
762 | } |
763 | |
764 | friend constexpr year_month |
765 | operator/(const year& __y, const month& __m) noexcept; |
766 | |
767 | friend constexpr month_day |
768 | operator/(const month& __m, int __d) noexcept; |
769 | |
770 | friend constexpr month_day_last |
771 | operator/(const month& __m, last_spec) noexcept; |
772 | |
773 | friend constexpr month_day_last |
774 | operator/(last_spec, const month& __m) noexcept; |
775 | |
776 | friend constexpr month_weekday |
777 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; |
778 | |
779 | friend constexpr month_weekday |
780 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; |
781 | |
782 | friend constexpr month_weekday_last |
783 | operator/(const month& __m, const weekday_last& __wdl) noexcept; |
784 | |
785 | friend constexpr month_weekday_last |
786 | operator/(const weekday_last& __wdl, const month& __m) noexcept; |
787 | }; |
788 | |
789 | inline constexpr month January{1}; |
790 | inline constexpr month February{2}; |
791 | inline constexpr month March{3}; |
792 | inline constexpr month April{4}; |
793 | inline constexpr month May{5}; |
794 | inline constexpr month June{6}; |
795 | inline constexpr month July{7}; |
796 | inline constexpr month August{8}; |
797 | inline constexpr month September{9}; |
798 | inline constexpr month October{10}; |
799 | inline constexpr month November{11}; |
800 | inline constexpr month December{12}; |
801 | |
802 | // YEAR |
803 | |
804 | class year |
805 | { |
806 | private: |
807 | short _M_y; |
808 | |
809 | public: |
810 | year() = default; |
811 | |
812 | explicit constexpr |
813 | year(int __y) noexcept |
814 | : _M_y{static_cast<short>(__y)} |
815 | { } |
816 | |
817 | static constexpr year |
818 | min() noexcept |
819 | { return year{-32767}; } |
820 | |
821 | static constexpr year |
822 | max() noexcept |
823 | { return year{32767}; } |
824 | |
825 | constexpr year& |
826 | operator++() noexcept |
827 | { |
828 | ++_M_y; |
829 | return *this; |
830 | } |
831 | |
832 | constexpr year |
833 | operator++(int) noexcept |
834 | { |
835 | auto __ret = *this; |
836 | ++(*this); |
837 | return __ret; |
838 | } |
839 | |
840 | constexpr year& |
841 | operator--() noexcept |
842 | { |
843 | --_M_y; |
844 | return *this; |
845 | } |
846 | |
847 | constexpr year |
848 | operator--(int) noexcept |
849 | { |
850 | auto __ret = *this; |
851 | --(*this); |
852 | return __ret; |
853 | } |
854 | |
855 | constexpr year& |
856 | operator+=(const years& __y) noexcept |
857 | { |
858 | *this = *this + __y; |
859 | return *this; |
860 | } |
861 | |
862 | constexpr year& |
863 | operator-=(const years& __y) noexcept |
864 | { |
865 | *this = *this - __y; |
866 | return *this; |
867 | } |
868 | |
869 | constexpr year |
870 | operator+() const noexcept |
871 | { return *this; } |
872 | |
873 | constexpr year |
874 | operator-() const noexcept |
875 | { return year{-_M_y}; } |
876 | |
877 | constexpr bool |
878 | is_leap() const noexcept |
879 | { |
880 | // Testing divisibility by 100 first gives better performance [1], i.e., |
881 | // return _M_y % 100 == 0 ? _M_y % 400 == 0 : _M_y % 16 == 0; |
882 | // Furthermore, if _M_y % 100 == 0, then _M_y % 400 == 0 is equivalent |
883 | // to _M_y % 16 == 0, so we can simplify it to |
884 | // return _M_y % 100 == 0 ? _M_y % 16 == 0 : _M_y % 4 == 0. // #1 |
885 | // Similarly, we can replace 100 with 25 (which is good since |
886 | // _M_y % 25 == 0 requires one fewer instruction than _M_y % 100 == 0 |
887 | // [2]): |
888 | // return _M_y % 25 == 0 ? _M_y % 16 == 0 : _M_y % 4 == 0. // #2 |
889 | // Indeed, first assume _M_y % 4 != 0. Then _M_y % 16 != 0 and hence, |
890 | // _M_y % 4 == 0 and _M_y % 16 == 0 are both false. Therefore, #2 |
891 | // returns false as it should (regardless of _M_y % 25.) Now assume |
892 | // _M_y % 4 == 0. In this case, _M_y % 25 == 0 if, and only if, |
893 | // _M_y % 100 == 0, that is, #1 and #2 are equivalent. Finally, #2 is |
894 | // equivalent to |
895 | // return (_M_y & (_M_y % 25 == 0 ? 15 : 3)) == 0. |
896 | |
897 | // References: |
898 | // [1] https://github.com/cassioneri/calendar |
899 | // [2] https://godbolt.org/z/55G8rn77e |
900 | // [3] https://gcc.gnu.org/pipermail/libstdc++/2021-June/052815.html |
901 | |
902 | return (_M_y & (_M_y % 25 == 0 ? 15 : 3)) == 0; |
903 | } |
904 | |
905 | explicit constexpr |
906 | operator int() const noexcept |
907 | { return _M_y; } |
908 | |
909 | constexpr bool |
910 | ok() const noexcept |
911 | { return min()._M_y <= _M_y && _M_y <= max()._M_y; } |
912 | |
913 | friend constexpr bool |
914 | operator==(const year& __x, const year& __y) noexcept |
915 | { return int{__x} == int{__y}; } |
916 | |
917 | friend constexpr strong_ordering |
918 | operator<=>(const year& __x, const year& __y) noexcept |
919 | { return int{__x} <=> int{__y}; } |
920 | |
921 | friend constexpr year |
922 | operator+(const year& __x, const years& __y) noexcept |
923 | { return year{int{__x} + static_cast<int>(__y.count())}; } |
924 | |
925 | friend constexpr year |
926 | operator+(const years& __x, const year& __y) noexcept |
927 | { return __y + __x; } |
928 | |
929 | friend constexpr year |
930 | operator-(const year& __x, const years& __y) noexcept |
931 | { return __x + -__y; } |
932 | |
933 | friend constexpr years |
934 | operator-(const year& __x, const year& __y) noexcept |
935 | { return years{int{__x} - int{__y}}; } |
936 | |
937 | friend constexpr year_month |
938 | operator/(const year& __y, int __m) noexcept; |
939 | |
940 | friend constexpr year_month_day |
941 | operator/(const year& __y, const month_day& __md) noexcept; |
942 | |
943 | friend constexpr year_month_day |
944 | operator/(const month_day& __md, const year& __y) noexcept; |
945 | |
946 | friend constexpr year_month_day_last |
947 | operator/(const year& __y, const month_day_last& __mdl) noexcept; |
948 | |
949 | friend constexpr year_month_day_last |
950 | operator/(const month_day_last& __mdl, const year& __y) noexcept; |
951 | |
952 | friend constexpr year_month_weekday |
953 | operator/(const year& __y, const month_weekday& __mwd) noexcept; |
954 | |
955 | friend constexpr year_month_weekday |
956 | operator/(const month_weekday& __mwd, const year& __y) noexcept; |
957 | |
958 | friend constexpr year_month_weekday_last |
959 | operator/(const year& __y, const month_weekday_last& __mwdl) noexcept; |
960 | |
961 | friend constexpr year_month_weekday_last |
962 | operator/(const month_weekday_last& __mwdl, const year& __y) noexcept; |
963 | }; |
964 | |
965 | // WEEKDAY |
966 | |
967 | class weekday |
968 | { |
969 | private: |
970 | unsigned char _M_wd; |
971 | |
972 | static constexpr weekday |
973 | _S_from_days(const days& __d) |
974 | { |
975 | return weekday{__detail::__add_modulo<7>(4, __d.count())}; |
976 | } |
977 | |
978 | public: |
979 | weekday() = default; |
980 | |
981 | explicit constexpr |
982 | weekday(unsigned __wd) noexcept |
983 | : _M_wd(__wd == 7 ? 0 : __wd) // __wd % 7 ? |
984 | { } |
985 | |
986 | constexpr |
987 | weekday(const sys_days& __dp) noexcept |
988 | : weekday{_S_from_days(__dp.time_since_epoch())} |
989 | { } |
990 | |
991 | explicit constexpr |
992 | weekday(const local_days& __dp) noexcept |
993 | : weekday{sys_days{__dp.time_since_epoch()}} |
994 | { } |
995 | |
996 | constexpr weekday& |
997 | operator++() noexcept |
998 | { |
999 | *this += days{1}; |
1000 | return *this; |
1001 | } |
1002 | |
1003 | constexpr weekday |
1004 | operator++(int) noexcept |
1005 | { |
1006 | auto __ret = *this; |
1007 | ++(*this); |
1008 | return __ret; |
1009 | } |
1010 | |
1011 | constexpr weekday& |
1012 | operator--() noexcept |
1013 | { |
1014 | *this -= days{1}; |
1015 | return *this; |
1016 | } |
1017 | |
1018 | constexpr weekday |
1019 | operator--(int) noexcept |
1020 | { |
1021 | auto __ret = *this; |
1022 | --(*this); |
1023 | return __ret; |
1024 | } |
1025 | |
1026 | constexpr weekday& |
1027 | operator+=(const days& __d) noexcept |
1028 | { |
1029 | *this = *this + __d; |
1030 | return *this; |
1031 | } |
1032 | |
1033 | constexpr weekday& |
1034 | operator-=(const days& __d) noexcept |
1035 | { |
1036 | *this = *this - __d; |
1037 | return *this; |
1038 | } |
1039 | |
1040 | constexpr unsigned |
1041 | c_encoding() const noexcept |
1042 | { return _M_wd; } |
1043 | |
1044 | constexpr unsigned |
1045 | iso_encoding() const noexcept |
1046 | { return _M_wd == 0u ? 7u : _M_wd; } |
1047 | |
1048 | constexpr bool |
1049 | ok() const noexcept |
1050 | { return _M_wd <= 6; } |
1051 | |
1052 | constexpr weekday_indexed |
1053 | operator[](unsigned __index) const noexcept; |
1054 | |
1055 | constexpr weekday_last |
1056 | operator[](last_spec) const noexcept; |
1057 | |
1058 | friend constexpr bool |
1059 | operator==(const weekday& __x, const weekday& __y) noexcept |
1060 | { return __x._M_wd == __y._M_wd; } |
1061 | |
1062 | friend constexpr weekday |
1063 | operator+(const weekday& __x, const days& __y) noexcept |
1064 | { |
1065 | return weekday{__detail::__add_modulo<7>(__x._M_wd, __y.count())}; |
1066 | } |
1067 | |
1068 | friend constexpr weekday |
1069 | operator+(const days& __x, const weekday& __y) noexcept |
1070 | { return __y + __x; } |
1071 | |
1072 | friend constexpr weekday |
1073 | operator-(const weekday& __x, const days& __y) noexcept |
1074 | { |
1075 | return weekday{__detail::__sub_modulo<7>(__x._M_wd, __y.count())}; |
1076 | } |
1077 | |
1078 | friend constexpr days |
1079 | operator-(const weekday& __x, const weekday& __y) noexcept |
1080 | { |
1081 | const auto __n = __x.c_encoding() - __y.c_encoding(); |
1082 | return static_cast<int>(__n) >= 0 ? days{__n} : days{__n + 7}; |
1083 | } |
1084 | }; |
1085 | |
1086 | inline constexpr weekday Sunday{0}; |
1087 | inline constexpr weekday Monday{1}; |
1088 | inline constexpr weekday Tuesday{2}; |
1089 | inline constexpr weekday Wednesday{3}; |
1090 | inline constexpr weekday Thursday{4}; |
1091 | inline constexpr weekday Friday{5}; |
1092 | inline constexpr weekday Saturday{6}; |
1093 | |
1094 | // WEEKDAY_INDEXED |
1095 | |
1096 | class weekday_indexed |
1097 | { |
1098 | private: |
1099 | chrono::weekday _M_wd; |
1100 | unsigned char _M_index; |
1101 | |
1102 | public: |
1103 | weekday_indexed() = default; |
1104 | |
1105 | constexpr |
1106 | weekday_indexed(const chrono::weekday& __wd, unsigned __index) noexcept |
1107 | : _M_wd(__wd), _M_index(__index) |
1108 | { } |
1109 | |
1110 | constexpr chrono::weekday |
1111 | weekday() const noexcept |
1112 | { return _M_wd; } |
1113 | |
1114 | constexpr unsigned |
1115 | index() const noexcept |
1116 | { return _M_index; }; |
1117 | |
1118 | constexpr bool |
1119 | ok() const noexcept |
1120 | { return _M_wd.ok() && 1 <= _M_index && _M_index <= 5; } |
1121 | |
1122 | friend constexpr bool |
1123 | operator==(const weekday_indexed& __x, const weekday_indexed& __y) noexcept |
1124 | { return __x.weekday() == __y.weekday() && __x.index() == __y.index(); } |
1125 | |
1126 | friend constexpr month_weekday |
1127 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; |
1128 | |
1129 | friend constexpr month_weekday |
1130 | operator/(int __m, const weekday_indexed& __wdi) noexcept; |
1131 | |
1132 | friend constexpr month_weekday |
1133 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; |
1134 | |
1135 | friend constexpr month_weekday |
1136 | operator/(const weekday_indexed& __wdi, int __m) noexcept; |
1137 | |
1138 | friend constexpr year_month_weekday |
1139 | operator/(const year_month& __ym, const weekday_indexed& __wdi) noexcept; |
1140 | }; |
1141 | |
1142 | constexpr weekday_indexed |
1143 | weekday::operator[](unsigned __index) const noexcept |
1144 | { return {*this, __index}; } |
1145 | |
1146 | // WEEKDAY_LAST |
1147 | |
1148 | class weekday_last |
1149 | { |
1150 | private: |
1151 | chrono::weekday _M_wd; |
1152 | |
1153 | public: |
1154 | explicit constexpr |
1155 | weekday_last(const chrono::weekday& __wd) noexcept |
1156 | : _M_wd{__wd} |
1157 | { } |
1158 | |
1159 | constexpr chrono::weekday |
1160 | weekday() const noexcept |
1161 | { return _M_wd; } |
1162 | |
1163 | constexpr bool |
1164 | ok() const noexcept |
1165 | { return _M_wd.ok(); } |
1166 | |
1167 | friend constexpr bool |
1168 | operator==(const weekday_last& __x, const weekday_last& __y) noexcept |
1169 | { return __x.weekday() == __y.weekday(); } |
1170 | |
1171 | friend constexpr month_weekday_last |
1172 | operator/(int __m, const weekday_last& __wdl) noexcept; |
1173 | |
1174 | friend constexpr month_weekday_last |
1175 | operator/(const weekday_last& __wdl, int __m) noexcept; |
1176 | |
1177 | friend constexpr year_month_weekday_last |
1178 | operator/(const year_month& __ym, const weekday_last& __wdl) noexcept; |
1179 | }; |
1180 | |
1181 | constexpr weekday_last |
1182 | weekday::operator[](last_spec) const noexcept |
1183 | { return weekday_last{*this}; } |
1184 | |
1185 | // MONTH_DAY |
1186 | |
1187 | class month_day |
1188 | { |
1189 | private: |
1190 | chrono::month _M_m; |
1191 | chrono::day _M_d; |
1192 | |
1193 | public: |
1194 | month_day() = default; |
1195 | |
1196 | constexpr |
1197 | month_day(const chrono::month& __m, const chrono::day& __d) noexcept |
1198 | : _M_m{__m}, _M_d{__d} |
1199 | { } |
1200 | |
1201 | constexpr chrono::month |
1202 | month() const noexcept |
1203 | { return _M_m; } |
1204 | |
1205 | constexpr chrono::day |
1206 | day() const noexcept |
1207 | { return _M_d; } |
1208 | |
1209 | constexpr bool |
1210 | ok() const noexcept |
1211 | { |
1212 | return _M_m.ok() |
1213 | && 1u <= unsigned(_M_d) |
1214 | && unsigned(_M_d) <= __detail::__days_per_month[unsigned(_M_m) - 1]; |
1215 | } |
1216 | |
1217 | friend constexpr bool |
1218 | operator==(const month_day& __x, const month_day& __y) noexcept |
1219 | { return __x.month() == __y.month() && __x.day() == __y.day(); } |
1220 | |
1221 | friend constexpr strong_ordering |
1222 | operator<=>(const month_day& __x, const month_day& __y) noexcept |
1223 | = default; |
1224 | |
1225 | friend constexpr month_day |
1226 | operator/(const chrono::month& __m, const chrono::day& __d) noexcept |
1227 | { return {__m, __d}; } |
1228 | |
1229 | friend constexpr month_day |
1230 | operator/(const chrono::month& __m, int __d) noexcept |
1231 | { return {__m, chrono::day(unsigned(__d))}; } |
1232 | |
1233 | friend constexpr month_day |
1234 | operator/(int __m, const chrono::day& __d) noexcept |
1235 | { return {chrono::month(unsigned(__m)), __d}; } |
1236 | |
1237 | friend constexpr month_day |
1238 | operator/(const chrono::day& __d, const chrono::month& __m) noexcept |
1239 | { return {__m, __d}; } |
1240 | |
1241 | friend constexpr month_day |
1242 | operator/(const chrono::day& __d, int __m) noexcept |
1243 | { return {chrono::month(unsigned(__m)), __d}; } |
1244 | |
1245 | friend constexpr year_month_day |
1246 | operator/(int __y, const month_day& __md) noexcept; |
1247 | |
1248 | friend constexpr year_month_day |
1249 | operator/(const month_day& __md, int __y) noexcept; |
1250 | }; |
1251 | |
1252 | // MONTH_DAY_LAST |
1253 | |
1254 | class month_day_last |
1255 | { |
1256 | private: |
1257 | chrono::month _M_m; |
1258 | |
1259 | public: |
1260 | explicit constexpr |
1261 | month_day_last(const chrono::month& __m) noexcept |
1262 | : _M_m{__m} |
1263 | { } |
1264 | |
1265 | constexpr chrono::month |
1266 | month() const noexcept |
1267 | { return _M_m; } |
1268 | |
1269 | constexpr bool |
1270 | ok() const noexcept |
1271 | { return _M_m.ok(); } |
1272 | |
1273 | friend constexpr bool |
1274 | operator==(const month_day_last& __x, const month_day_last& __y) noexcept |
1275 | { return __x.month() == __y.month(); } |
1276 | |
1277 | friend constexpr strong_ordering |
1278 | operator<=>(const month_day_last& __x, const month_day_last& __y) noexcept |
1279 | = default; |
1280 | |
1281 | friend constexpr month_day_last |
1282 | operator/(const chrono::month& __m, last_spec) noexcept |
1283 | { return month_day_last{__m}; } |
1284 | |
1285 | friend constexpr month_day_last |
1286 | operator/(int __m, last_spec) noexcept |
1287 | { return chrono::month(unsigned(__m)) / last; } |
1288 | |
1289 | friend constexpr month_day_last |
1290 | operator/(last_spec, const chrono::month& __m) noexcept |
1291 | { return __m / last; } |
1292 | |
1293 | friend constexpr month_day_last |
1294 | operator/(last_spec, int __m) noexcept |
1295 | { return __m / last; } |
1296 | |
1297 | friend constexpr year_month_day_last |
1298 | operator/(int __y, const month_day_last& __mdl) noexcept; |
1299 | |
1300 | friend constexpr year_month_day_last |
1301 | operator/(const month_day_last& __mdl, int __y) noexcept; |
1302 | }; |
1303 | |
1304 | // MONTH_WEEKDAY |
1305 | |
1306 | class month_weekday |
1307 | { |
1308 | private: |
1309 | chrono::month _M_m; |
1310 | chrono::weekday_indexed _M_wdi; |
1311 | |
1312 | public: |
1313 | constexpr |
1314 | month_weekday(const chrono::month& __m, |
1315 | const chrono::weekday_indexed& __wdi) noexcept |
1316 | : _M_m{__m}, _M_wdi{__wdi} |
1317 | { } |
1318 | |
1319 | constexpr chrono::month |
1320 | month() const noexcept |
1321 | { return _M_m; } |
1322 | |
1323 | constexpr chrono::weekday_indexed |
1324 | weekday_indexed() const noexcept |
1325 | { return _M_wdi; } |
1326 | |
1327 | constexpr bool |
1328 | ok() const noexcept |
1329 | { return _M_m.ok() && _M_wdi.ok(); } |
1330 | |
1331 | friend constexpr bool |
1332 | operator==(const month_weekday& __x, const month_weekday& __y) noexcept |
1333 | { |
1334 | return __x.month() == __y.month() |
1335 | && __x.weekday_indexed() == __y.weekday_indexed(); |
1336 | } |
1337 | |
1338 | friend constexpr month_weekday |
1339 | operator/(const chrono::month& __m, |
1340 | const chrono::weekday_indexed& __wdi) noexcept |
1341 | { return {__m, __wdi}; } |
1342 | |
1343 | friend constexpr month_weekday |
1344 | operator/(int __m, const chrono::weekday_indexed& __wdi) noexcept |
1345 | { return chrono::month(unsigned(__m)) / __wdi; } |
1346 | |
1347 | friend constexpr month_weekday |
1348 | operator/(const chrono::weekday_indexed& __wdi, |
1349 | const chrono::month& __m) noexcept |
1350 | { return __m / __wdi; } |
1351 | |
1352 | friend constexpr month_weekday |
1353 | operator/(const chrono::weekday_indexed& __wdi, int __m) noexcept |
1354 | { return __m / __wdi; } |
1355 | |
1356 | friend constexpr year_month_weekday |
1357 | operator/(int __y, const month_weekday& __mwd) noexcept; |
1358 | |
1359 | friend constexpr year_month_weekday |
1360 | operator/(const month_weekday& __mwd, int __y) noexcept; |
1361 | }; |
1362 | |
1363 | // MONTH_WEEKDAY_LAST |
1364 | |
1365 | class month_weekday_last |
1366 | { |
1367 | private: |
1368 | chrono::month _M_m; |
1369 | chrono::weekday_last _M_wdl; |
1370 | |
1371 | public: |
1372 | constexpr |
1373 | month_weekday_last(const chrono::month& __m, |
1374 | const chrono::weekday_last& __wdl) noexcept |
1375 | :_M_m{__m}, _M_wdl{__wdl} |
1376 | { } |
1377 | |
1378 | constexpr chrono::month |
1379 | month() const noexcept |
1380 | { return _M_m; } |
1381 | |
1382 | constexpr chrono::weekday_last |
1383 | weekday_last() const noexcept |
1384 | { return _M_wdl; } |
1385 | |
1386 | constexpr bool |
1387 | ok() const noexcept |
1388 | { return _M_m.ok() && _M_wdl.ok(); } |
1389 | |
1390 | friend constexpr bool |
1391 | operator==(const month_weekday_last& __x, |
1392 | const month_weekday_last& __y) noexcept |
1393 | { |
1394 | return __x.month() == __y.month() |
1395 | && __x.weekday_last() == __y.weekday_last(); |
1396 | } |
1397 | |
1398 | friend constexpr month_weekday_last |
1399 | operator/(const chrono::month& __m, |
1400 | const chrono::weekday_last& __wdl) noexcept |
1401 | { return {__m, __wdl}; } |
1402 | |
1403 | friend constexpr month_weekday_last |
1404 | operator/(int __m, const chrono::weekday_last& __wdl) noexcept |
1405 | { return chrono::month(unsigned(__m)) / __wdl; } |
1406 | |
1407 | friend constexpr month_weekday_last |
1408 | operator/(const chrono::weekday_last& __wdl, |
1409 | const chrono::month& __m) noexcept |
1410 | { return __m / __wdl; } |
1411 | |
1412 | friend constexpr month_weekday_last |
1413 | operator/(const chrono::weekday_last& __wdl, int __m) noexcept |
1414 | { return chrono::month(unsigned(__m)) / __wdl; } |
1415 | |
1416 | friend constexpr year_month_weekday_last |
1417 | operator/(int __y, const month_weekday_last& __mwdl) noexcept; |
1418 | |
1419 | friend constexpr year_month_weekday_last |
1420 | operator/(const month_weekday_last& __mwdl, int __y) noexcept; |
1421 | }; |
1422 | |
1423 | // YEAR_MONTH |
1424 | |
1425 | namespace __detail |
1426 | { |
1427 | // [time.cal.ym], [time.cal.ymd], etc constrain the 'months'-based |
1428 | // addition/subtraction operator overloads like so: |
1429 | // |
1430 | // Constraints: if the argument supplied by the caller for the months |
1431 | // parameter is convertible to years, its implicit conversion sequence |
1432 | // to years is worse than its implicit conversion sequence to months. |
1433 | // |
1434 | // We realize this constraint by templatizing the 'months'-based |
1435 | // overloads (using a dummy defaulted template parameter), so that |
1436 | // overload resolution doesn't select the 'months'-based overload unless |
1437 | // the implicit conversion sequence to 'months' is better than that to |
1438 | // 'years'. |
1439 | using __months_years_conversion_disambiguator = void; |
1440 | } |
1441 | |
1442 | class year_month |
1443 | { |
1444 | private: |
1445 | chrono::year _M_y; |
1446 | chrono::month _M_m; |
1447 | |
1448 | public: |
1449 | year_month() = default; |
1450 | |
1451 | constexpr |
1452 | year_month(const chrono::year& __y, const chrono::month& __m) noexcept |
1453 | : _M_y{__y}, _M_m{__m} |
1454 | { } |
1455 | |
1456 | constexpr chrono::year |
1457 | year() const noexcept |
1458 | { return _M_y; } |
1459 | |
1460 | constexpr chrono::month |
1461 | month() const noexcept |
1462 | { return _M_m; } |
1463 | |
1464 | template<typename = __detail::__months_years_conversion_disambiguator> |
1465 | constexpr year_month& |
1466 | operator+=(const months& __dm) noexcept |
1467 | { |
1468 | *this = *this + __dm; |
1469 | return *this; |
1470 | } |
1471 | |
1472 | template<typename = __detail::__months_years_conversion_disambiguator> |
1473 | constexpr year_month& |
1474 | operator-=(const months& __dm) noexcept |
1475 | { |
1476 | *this = *this - __dm; |
1477 | return *this; |
1478 | } |
1479 | |
1480 | constexpr year_month& |
1481 | operator+=(const years& __dy) noexcept |
1482 | { |
1483 | *this = *this + __dy; |
1484 | return *this; |
1485 | } |
1486 | |
1487 | constexpr year_month& |
1488 | operator-=(const years& __dy) noexcept |
1489 | { |
1490 | *this = *this - __dy; |
1491 | return *this; |
1492 | } |
1493 | |
1494 | constexpr bool |
1495 | ok() const noexcept |
1496 | { return _M_y.ok() && _M_m.ok(); } |
1497 | |
1498 | friend constexpr bool |
1499 | operator==(const year_month& __x, const year_month& __y) noexcept |
1500 | { return __x.year() == __y.year() && __x.month() == __y.month(); } |
1501 | |
1502 | friend constexpr strong_ordering |
1503 | operator<=>(const year_month& __x, const year_month& __y) noexcept |
1504 | = default; |
1505 | |
1506 | template<typename = __detail::__months_years_conversion_disambiguator> |
1507 | friend constexpr year_month |
1508 | operator+(const year_month& __ym, const months& __dm) noexcept |
1509 | { |
1510 | // TODO: Optimize? |
1511 | auto __m = __ym.month() + __dm; |
1512 | auto __i = int(unsigned(__ym.month())) - 1 + __dm.count(); |
1513 | auto __y = (__i < 0 |
1514 | ? __ym.year() + years{(__i - 11) / 12} |
1515 | : __ym.year() + years{__i / 12}); |
1516 | return __y / __m; |
1517 | } |
1518 | |
1519 | template<typename = __detail::__months_years_conversion_disambiguator> |
1520 | friend constexpr year_month |
1521 | operator+(const months& __dm, const year_month& __ym) noexcept |
1522 | { return __ym + __dm; } |
1523 | |
1524 | template<typename = __detail::__months_years_conversion_disambiguator> |
1525 | friend constexpr year_month |
1526 | operator-(const year_month& __ym, const months& __dm) noexcept |
1527 | { return __ym + -__dm; } |
1528 | |
1529 | friend constexpr months |
1530 | operator-(const year_month& __x, const year_month& __y) noexcept |
1531 | { |
1532 | return (__x.year() - __y.year() |
1533 | + months{static_cast<int>(unsigned{__x.month()}) |
1534 | - static_cast<int>(unsigned{__y.month()})}); |
1535 | } |
1536 | |
1537 | friend constexpr year_month |
1538 | operator+(const year_month& __ym, const years& __dy) noexcept |
1539 | { return (__ym.year() + __dy) / __ym.month(); } |
1540 | |
1541 | friend constexpr year_month |
1542 | operator+(const years& __dy, const year_month& __ym) noexcept |
1543 | { return __ym + __dy; } |
1544 | |
1545 | friend constexpr year_month |
1546 | operator-(const year_month& __ym, const years& __dy) noexcept |
1547 | { return __ym + -__dy; } |
1548 | |
1549 | friend constexpr year_month |
1550 | operator/(const chrono::year& __y, const chrono::month& __m) noexcept |
1551 | { return {__y, __m}; } |
1552 | |
1553 | friend constexpr year_month |
1554 | operator/(const chrono::year& __y, int __m) noexcept |
1555 | { return {__y, chrono::month(unsigned(__m))}; } |
1556 | |
1557 | friend constexpr year_month_day |
1558 | operator/(const year_month& __ym, int __d) noexcept; |
1559 | |
1560 | friend constexpr year_month_day_last |
1561 | operator/(const year_month& __ym, last_spec) noexcept; |
1562 | }; |
1563 | |
1564 | // YEAR_MONTH_DAY |
1565 | |
1566 | class year_month_day |
1567 | { |
1568 | private: |
1569 | chrono::year _M_y; |
1570 | chrono::month _M_m; |
1571 | chrono::day _M_d; |
1572 | |
1573 | static constexpr year_month_day _S_from_days(const days& __dp) noexcept; |
1574 | |
1575 | constexpr days _M_days_since_epoch() const noexcept; |
1576 | |
1577 | public: |
1578 | year_month_day() = default; |
1579 | |
1580 | constexpr |
1581 | year_month_day(const chrono::year& __y, const chrono::month& __m, |
1582 | const chrono::day& __d) noexcept |
1583 | : _M_y{__y}, _M_m{__m}, _M_d{__d} |
1584 | { } |
1585 | |
1586 | constexpr |
1587 | year_month_day(const year_month_day_last& __ymdl) noexcept; |
1588 | |
1589 | constexpr |
1590 | year_month_day(const sys_days& __dp) noexcept |
1591 | : year_month_day(_S_from_days(__dp.time_since_epoch())) |
1592 | { } |
1593 | |
1594 | explicit constexpr |
1595 | year_month_day(const local_days& __dp) noexcept |
1596 | : year_month_day(sys_days{__dp.time_since_epoch()}) |
1597 | { } |
1598 | |
1599 | template<typename = __detail::__months_years_conversion_disambiguator> |
1600 | constexpr year_month_day& |
1601 | operator+=(const months& __m) noexcept |
1602 | { |
1603 | *this = *this + __m; |
1604 | return *this; |
1605 | } |
1606 | |
1607 | template<typename = __detail::__months_years_conversion_disambiguator> |
1608 | constexpr year_month_day& |
1609 | operator-=(const months& __m) noexcept |
1610 | { |
1611 | *this = *this - __m; |
1612 | return *this; |
1613 | } |
1614 | |
1615 | constexpr year_month_day& |
1616 | operator+=(const years& __y) noexcept |
1617 | { |
1618 | *this = *this + __y; |
1619 | return *this; |
1620 | } |
1621 | |
1622 | constexpr year_month_day& |
1623 | operator-=(const years& __y) noexcept |
1624 | { |
1625 | *this = *this - __y; |
1626 | return *this; |
1627 | } |
1628 | |
1629 | constexpr chrono::year |
1630 | year() const noexcept |
1631 | { return _M_y; } |
1632 | |
1633 | constexpr chrono::month |
1634 | month() const noexcept |
1635 | { return _M_m; } |
1636 | |
1637 | constexpr chrono::day |
1638 | day() const noexcept |
1639 | { return _M_d; } |
1640 | |
1641 | constexpr |
1642 | operator sys_days() const noexcept |
1643 | { return sys_days{_M_days_since_epoch()}; } |
1644 | |
1645 | explicit constexpr |
1646 | operator local_days() const noexcept |
1647 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
1648 | |
1649 | constexpr bool ok() const noexcept; |
1650 | |
1651 | friend constexpr bool |
1652 | operator==(const year_month_day& __x, const year_month_day& __y) noexcept |
1653 | { |
1654 | return __x.year() == __y.year() |
1655 | && __x.month() == __y.month() |
1656 | && __x.day() == __y.day(); |
1657 | } |
1658 | |
1659 | friend constexpr strong_ordering |
1660 | operator<=>(const year_month_day& __x, const year_month_day& __y) noexcept |
1661 | = default; |
1662 | |
1663 | template<typename = __detail::__months_years_conversion_disambiguator> |
1664 | friend constexpr year_month_day |
1665 | operator+(const year_month_day& __ymd, const months& __dm) noexcept |
1666 | { return (__ymd.year() / __ymd.month() + __dm) / __ymd.day(); } |
1667 | |
1668 | template<typename = __detail::__months_years_conversion_disambiguator> |
1669 | friend constexpr year_month_day |
1670 | operator+(const months& __dm, const year_month_day& __ymd) noexcept |
1671 | { return __ymd + __dm; } |
1672 | |
1673 | friend constexpr year_month_day |
1674 | operator+(const year_month_day& __ymd, const years& __dy) noexcept |
1675 | { return (__ymd.year() + __dy) / __ymd.month() / __ymd.day(); } |
1676 | |
1677 | friend constexpr year_month_day |
1678 | operator+(const years& __dy, const year_month_day& __ymd) noexcept |
1679 | { return __ymd + __dy; } |
1680 | |
1681 | template<typename = __detail::__months_years_conversion_disambiguator> |
1682 | friend constexpr year_month_day |
1683 | operator-(const year_month_day& __ymd, const months& __dm) noexcept |
1684 | { return __ymd + -__dm; } |
1685 | |
1686 | friend constexpr year_month_day |
1687 | operator-(const year_month_day& __ymd, const years& __dy) noexcept |
1688 | { return __ymd + -__dy; } |
1689 | |
1690 | friend constexpr year_month_day |
1691 | operator/(const year_month& __ym, const chrono::day& __d) noexcept |
1692 | { return {__ym.year(), __ym.month(), __d}; } |
1693 | |
1694 | friend constexpr year_month_day |
1695 | operator/(const year_month& __ym, int __d) noexcept |
1696 | { return __ym / chrono::day{unsigned(__d)}; } |
1697 | |
1698 | friend constexpr year_month_day |
1699 | operator/(const chrono::year& __y, const month_day& __md) noexcept |
1700 | { return __y / __md.month() / __md.day(); } |
1701 | |
1702 | friend constexpr year_month_day |
1703 | operator/(int __y, const month_day& __md) noexcept |
1704 | { return chrono::year{__y} / __md; } |
1705 | |
1706 | friend constexpr year_month_day |
1707 | operator/(const month_day& __md, const chrono::year& __y) noexcept |
1708 | { return __y / __md; } |
1709 | |
1710 | friend constexpr year_month_day |
1711 | operator/(const month_day& __md, int __y) noexcept |
1712 | { return chrono::year(__y) / __md; } |
1713 | }; |
1714 | |
1715 | // Construct from days since 1970/01/01. |
1716 | // Proposition 6.3 of Neri and Schneider, |
1717 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". |
1718 | // https://arxiv.org/abs/2102.06959 |
1719 | constexpr year_month_day |
1720 | year_month_day::_S_from_days(const days& __dp) noexcept |
1721 | { |
1722 | constexpr auto __z2 = static_cast<uint32_t>(-1468000); |
1723 | constexpr auto __r2_e3 = static_cast<uint32_t>(536895458); |
1724 | |
1725 | const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3; |
1726 | |
1727 | const auto __n1 = 4 * __r0 + 3; |
1728 | const auto __q1 = __n1 / 146097; |
1729 | const auto __r1 = __n1 % 146097 / 4; |
1730 | |
1731 | constexpr auto __p32 = static_cast<uint64_t>(1) << 32; |
1732 | const auto __n2 = 4 * __r1 + 3; |
1733 | const auto __u2 = static_cast<uint64_t>(2939745) * __n2; |
1734 | const auto __q2 = static_cast<uint32_t>(__u2 / __p32); |
1735 | const auto __r2 = static_cast<uint32_t>(__u2 % __p32) / 2939745 / 4; |
1736 | |
1737 | constexpr auto __p16 = static_cast<uint32_t>(1) << 16; |
1738 | const auto __n3 = 2141 * __r2 + 197913; |
1739 | const auto __q3 = __n3 / __p16; |
1740 | const auto __r3 = __n3 % __p16 / 2141; |
1741 | |
1742 | const auto __y0 = 100 * __q1 + __q2; |
1743 | const auto __m0 = __q3; |
1744 | const auto __d0 = __r3; |
1745 | |
1746 | const auto __j = __r2 >= 306; |
1747 | const auto __y1 = __y0 + __j; |
1748 | const auto __m1 = __j ? __m0 - 12 : __m0; |
1749 | const auto __d1 = __d0 + 1; |
1750 | |
1751 | return year_month_day{chrono::year{static_cast<int>(__y1 + __z2)}, |
1752 | chrono::month{__m1}, chrono::day{__d1}}; |
1753 | } |
1754 | |
1755 | // Days since 1970/01/01. |
1756 | // Proposition 6.2 of Neri and Schneider, |
1757 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". |
1758 | // https://arxiv.org/abs/2102.06959 |
1759 | constexpr days |
1760 | year_month_day::_M_days_since_epoch() const noexcept |
1761 | { |
1762 | auto constexpr __z2 = static_cast<uint32_t>(-1468000); |
1763 | auto constexpr __r2_e3 = static_cast<uint32_t>(536895458); |
1764 | |
1765 | const auto __y1 = static_cast<uint32_t>(static_cast<int>(_M_y)) - __z2; |
1766 | const auto __m1 = static_cast<uint32_t>(static_cast<unsigned>(_M_m)); |
1767 | const auto __d1 = static_cast<uint32_t>(static_cast<unsigned>(_M_d)); |
1768 | |
1769 | const auto __j = static_cast<uint32_t>(__m1 < 3); |
1770 | const auto __y0 = __y1 - __j; |
1771 | const auto __m0 = __j ? __m1 + 12 : __m1; |
1772 | const auto __d0 = __d1 - 1; |
1773 | |
1774 | const auto __q1 = __y0 / 100; |
1775 | const auto __yc = 1461 * __y0 / 4 - __q1 + __q1 / 4; |
1776 | const auto __mc = (979 *__m0 - 2919) / 32; |
1777 | const auto __dc = __d0; |
1778 | |
1779 | return days{static_cast<int32_t>(__yc + __mc + __dc - __r2_e3)}; |
1780 | } |
1781 | |
1782 | // YEAR_MONTH_DAY_LAST |
1783 | |
1784 | class year_month_day_last |
1785 | { |
1786 | private: |
1787 | chrono::year _M_y; |
1788 | chrono::month_day_last _M_mdl; |
1789 | |
1790 | public: |
1791 | constexpr |
1792 | year_month_day_last(const chrono::year& __y, |
1793 | const chrono::month_day_last& __mdl) noexcept |
1794 | : _M_y{__y}, _M_mdl{__mdl} |
1795 | { } |
1796 | |
1797 | template<typename = __detail::__months_years_conversion_disambiguator> |
1798 | constexpr year_month_day_last& |
1799 | operator+=(const months& __m) noexcept |
1800 | { |
1801 | *this = *this + __m; |
1802 | return *this; |
1803 | } |
1804 | |
1805 | template<typename = __detail::__months_years_conversion_disambiguator> |
1806 | constexpr year_month_day_last& |
1807 | operator-=(const months& __m) noexcept |
1808 | { |
1809 | *this = *this - __m; |
1810 | return *this; |
1811 | } |
1812 | |
1813 | constexpr year_month_day_last& |
1814 | operator+=(const years& __y) noexcept |
1815 | { |
1816 | *this = *this + __y; |
1817 | return *this; |
1818 | } |
1819 | |
1820 | constexpr year_month_day_last& |
1821 | operator-=(const years& __y) noexcept |
1822 | { |
1823 | *this = *this - __y; |
1824 | return *this; |
1825 | } |
1826 | |
1827 | constexpr chrono::year |
1828 | year() const noexcept |
1829 | { return _M_y; } |
1830 | |
1831 | constexpr chrono::month |
1832 | month() const noexcept |
1833 | { return _M_mdl.month(); } |
1834 | |
1835 | constexpr chrono::month_day_last |
1836 | month_day_last() const noexcept |
1837 | { return _M_mdl; } |
1838 | |
1839 | // Return A day representing the last day of this year, month pair. |
1840 | constexpr chrono::day |
1841 | day() const noexcept |
1842 | { |
1843 | const auto __m = static_cast<unsigned>(month()); |
1844 | |
1845 | // The result is unspecified if __m < 1 or __m > 12. Hence, assume |
1846 | // 1 <= __m <= 12. For __m != 2, day() == 30 or day() == 31 or, in |
1847 | // other words, day () == 30 | b, where b is in {0, 1}. |
1848 | |
1849 | // If __m in {1, 3, 4, 5, 6, 7}, then b is 1 if, and only if, __m is |
1850 | // odd. Hence, b = __m & 1 = (__m ^ 0) & 1. |
1851 | |
1852 | // If __m in {8, 9, 10, 11, 12}, then b is 1 if, and only if, __m is |
1853 | // even. Hence, b = (__m ^ 1) & 1. |
1854 | |
1855 | // Therefore, b = (__m ^ c) & 1, where c = 0, if __m < 8, or c = 1 if |
1856 | // __m >= 8, that is, c = __m >> 3. |
1857 | |
1858 | // Since 30 = (11110)_2 and __m <= 31 = (11111)_2, the "& 1" in b's |
1859 | // calculation is unnecessary. |
1860 | |
1861 | // The performance of this implementation does not depend on look-up |
1862 | // tables being on the L1 cache. |
1863 | return chrono::day{__m != 2 ? (__m ^ (__m >> 3)) | 30 |
1864 | : _M_y.is_leap() ? 29 : 28}; |
1865 | } |
1866 | |
1867 | constexpr |
1868 | operator sys_days() const noexcept |
1869 | { return sys_days{year() / month() / day()}; } |
1870 | |
1871 | explicit constexpr |
1872 | operator local_days() const noexcept |
1873 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
1874 | |
1875 | constexpr bool |
1876 | ok() const noexcept |
1877 | { return _M_y.ok() && _M_mdl.ok(); } |
1878 | |
1879 | friend constexpr bool |
1880 | operator==(const year_month_day_last& __x, |
1881 | const year_month_day_last& __y) noexcept |
1882 | { |
1883 | return __x.year() == __y.year() |
1884 | && __x.month_day_last() == __y.month_day_last(); |
1885 | } |
1886 | |
1887 | friend constexpr strong_ordering |
1888 | operator<=>(const year_month_day_last& __x, |
1889 | const year_month_day_last& __y) noexcept |
1890 | = default; |
1891 | |
1892 | template<typename = __detail::__months_years_conversion_disambiguator> |
1893 | friend constexpr year_month_day_last |
1894 | operator+(const year_month_day_last& __ymdl, |
1895 | const months& __dm) noexcept |
1896 | { return (__ymdl.year() / __ymdl.month() + __dm) / last; } |
1897 | |
1898 | template<typename = __detail::__months_years_conversion_disambiguator> |
1899 | friend constexpr year_month_day_last |
1900 | operator+(const months& __dm, |
1901 | const year_month_day_last& __ymdl) noexcept |
1902 | { return __ymdl + __dm; } |
1903 | |
1904 | template<typename = __detail::__months_years_conversion_disambiguator> |
1905 | friend constexpr year_month_day_last |
1906 | operator-(const year_month_day_last& __ymdl, |
1907 | const months& __dm) noexcept |
1908 | { return __ymdl + -__dm; } |
1909 | |
1910 | friend constexpr year_month_day_last |
1911 | operator+(const year_month_day_last& __ymdl, |
1912 | const years& __dy) noexcept |
1913 | { return {__ymdl.year() + __dy, __ymdl.month_day_last()}; } |
1914 | |
1915 | friend constexpr year_month_day_last |
1916 | operator+(const years& __dy, |
1917 | const year_month_day_last& __ymdl) noexcept |
1918 | { return __ymdl + __dy; } |
1919 | |
1920 | friend constexpr year_month_day_last |
1921 | operator-(const year_month_day_last& __ymdl, |
1922 | const years& __dy) noexcept |
1923 | { return __ymdl + -__dy; } |
1924 | |
1925 | friend constexpr year_month_day_last |
1926 | operator/(const year_month& __ym, last_spec) noexcept |
1927 | { return {__ym.year(), chrono::month_day_last{__ym.month()}}; } |
1928 | |
1929 | friend constexpr year_month_day_last |
1930 | operator/(const chrono::year& __y, |
1931 | const chrono::month_day_last& __mdl) noexcept |
1932 | { return {__y, __mdl}; } |
1933 | |
1934 | friend constexpr year_month_day_last |
1935 | operator/(int __y, const chrono::month_day_last& __mdl) noexcept |
1936 | { return chrono::year(__y) / __mdl; } |
1937 | |
1938 | friend constexpr year_month_day_last |
1939 | operator/(const chrono::month_day_last& __mdl, |
1940 | const chrono::year& __y) noexcept |
1941 | { return __y / __mdl; } |
1942 | |
1943 | friend constexpr year_month_day_last |
1944 | operator/(const chrono::month_day_last& __mdl, int __y) noexcept |
1945 | { return chrono::year(__y) / __mdl; } |
1946 | }; |
1947 | |
1948 | // year_month_day ctor from year_month_day_last |
1949 | constexpr |
1950 | year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept |
1951 | : _M_y{__ymdl.year()}, _M_m{__ymdl.month()}, _M_d{__ymdl.day()} |
1952 | { } |
1953 | |
1954 | constexpr bool |
1955 | year_month_day::ok() const noexcept |
1956 | { |
1957 | if (!_M_y.ok() || !_M_m.ok()) |
1958 | return false; |
1959 | return chrono::day{1} <= _M_d && _M_d <= (_M_y / _M_m / last).day(); |
1960 | } |
1961 | |
1962 | // YEAR_MONTH_WEEKDAY |
1963 | |
1964 | class year_month_weekday |
1965 | { |
1966 | private: |
1967 | chrono::year _M_y; |
1968 | chrono::month _M_m; |
1969 | chrono::weekday_indexed _M_wdi; |
1970 | |
1971 | static constexpr year_month_weekday |
1972 | _S_from_sys_days(const sys_days& __dp) |
1973 | { |
1974 | year_month_day __ymd{__dp}; |
1975 | chrono::weekday __wd{__dp}; |
1976 | auto __index = __wd[(unsigned{__ymd.day()} - 1) / 7 + 1]; |
1977 | return {__ymd.year(), __ymd.month(), __index}; |
1978 | } |
1979 | |
1980 | public: |
1981 | year_month_weekday() = default; |
1982 | |
1983 | constexpr |
1984 | year_month_weekday(const chrono::year& __y, const chrono::month& __m, |
1985 | const chrono::weekday_indexed& __wdi) noexcept |
1986 | : _M_y{__y}, _M_m{__m}, _M_wdi{__wdi} |
1987 | { } |
1988 | |
1989 | constexpr |
1990 | year_month_weekday(const sys_days& __dp) noexcept |
1991 | : year_month_weekday{_S_from_sys_days(__dp)} |
1992 | { } |
1993 | |
1994 | explicit constexpr |
1995 | year_month_weekday(const local_days& __dp) noexcept |
1996 | : year_month_weekday{sys_days{__dp.time_since_epoch()}} |
1997 | { } |
1998 | |
1999 | template<typename = __detail::__months_years_conversion_disambiguator> |
2000 | constexpr year_month_weekday& |
2001 | operator+=(const months& __m) noexcept |
2002 | { |
2003 | *this = *this + __m; |
2004 | return *this; |
2005 | } |
2006 | |
2007 | template<typename = __detail::__months_years_conversion_disambiguator> |
2008 | constexpr year_month_weekday& |
2009 | operator-=(const months& __m) noexcept |
2010 | { |
2011 | *this = *this - __m; |
2012 | return *this; |
2013 | } |
2014 | |
2015 | constexpr year_month_weekday& |
2016 | operator+=(const years& __y) noexcept |
2017 | { |
2018 | *this = *this + __y; |
2019 | return *this; |
2020 | } |
2021 | |
2022 | constexpr year_month_weekday& |
2023 | operator-=(const years& __y) noexcept |
2024 | { |
2025 | *this = *this - __y; |
2026 | return *this; |
2027 | } |
2028 | |
2029 | constexpr chrono::year |
2030 | year() const noexcept |
2031 | { return _M_y; } |
2032 | |
2033 | constexpr chrono::month |
2034 | month() const noexcept |
2035 | { return _M_m; } |
2036 | |
2037 | constexpr chrono::weekday |
2038 | weekday() const noexcept |
2039 | { return _M_wdi.weekday(); } |
2040 | |
2041 | constexpr unsigned |
2042 | index() const noexcept |
2043 | { return _M_wdi.index(); } |
2044 | |
2045 | constexpr chrono::weekday_indexed |
2046 | weekday_indexed() const noexcept |
2047 | { return _M_wdi; } |
2048 | |
2049 | constexpr |
2050 | operator sys_days() const noexcept |
2051 | { |
2052 | auto __d = sys_days{year() / month() / 1}; |
2053 | return __d + (weekday() - chrono::weekday(__d) |
2054 | + days{(static_cast<int>(index())-1)*7}); |
2055 | } |
2056 | |
2057 | explicit constexpr |
2058 | operator local_days() const noexcept |
2059 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
2060 | |
2061 | constexpr bool |
2062 | ok() const noexcept |
2063 | { |
2064 | if (!_M_y.ok() || !_M_m.ok() || !_M_wdi.ok()) |
2065 | return false; |
2066 | if (_M_wdi.index() <= 4) |
2067 | return true; |
2068 | days __d = (_M_wdi.weekday() |
2069 | - chrono::weekday{sys_days{_M_y / _M_m / 1}} |
2070 | + days((_M_wdi.index()-1)*7 + 1)); |
2071 | __glibcxx_assert(__d.count() >= 1); |
2072 | return (unsigned)__d.count() <= (unsigned)(_M_y / _M_m / last).day(); |
2073 | } |
2074 | |
2075 | friend constexpr bool |
2076 | operator==(const year_month_weekday& __x, |
2077 | const year_month_weekday& __y) noexcept |
2078 | { |
2079 | return __x.year() == __y.year() |
2080 | && __x.month() == __y.month() |
2081 | && __x.weekday_indexed() == __y.weekday_indexed(); |
2082 | } |
2083 | |
2084 | template<typename = __detail::__months_years_conversion_disambiguator> |
2085 | friend constexpr year_month_weekday |
2086 | operator+(const year_month_weekday& __ymwd, const months& __dm) noexcept |
2087 | { |
2088 | return ((__ymwd.year() / __ymwd.month() + __dm) |
2089 | / __ymwd.weekday_indexed()); |
2090 | } |
2091 | |
2092 | template<typename = __detail::__months_years_conversion_disambiguator> |
2093 | friend constexpr year_month_weekday |
2094 | operator+(const months& __dm, const year_month_weekday& __ymwd) noexcept |
2095 | { return __ymwd + __dm; } |
2096 | |
2097 | friend constexpr year_month_weekday |
2098 | operator+(const year_month_weekday& __ymwd, const years& __dy) noexcept |
2099 | { return {__ymwd.year() + __dy, __ymwd.month(), __ymwd.weekday_indexed()}; } |
2100 | |
2101 | friend constexpr year_month_weekday |
2102 | operator+(const years& __dy, const year_month_weekday& __ymwd) noexcept |
2103 | { return __ymwd + __dy; } |
2104 | |
2105 | template<typename = __detail::__months_years_conversion_disambiguator> |
2106 | friend constexpr year_month_weekday |
2107 | operator-(const year_month_weekday& __ymwd, const months& __dm) noexcept |
2108 | { return __ymwd + -__dm; } |
2109 | |
2110 | friend constexpr year_month_weekday |
2111 | operator-(const year_month_weekday& __ymwd, const years& __dy) noexcept |
2112 | { return __ymwd + -__dy; } |
2113 | |
2114 | friend constexpr year_month_weekday |
2115 | operator/(const year_month& __ym, |
2116 | const chrono::weekday_indexed& __wdi) noexcept |
2117 | { return {__ym.year(), __ym.month(), __wdi}; } |
2118 | |
2119 | friend constexpr year_month_weekday |
2120 | operator/(const chrono::year& __y, const month_weekday& __mwd) noexcept |
2121 | { return {__y, __mwd.month(), __mwd.weekday_indexed()}; } |
2122 | |
2123 | friend constexpr year_month_weekday |
2124 | operator/(int __y, const month_weekday& __mwd) noexcept |
2125 | { return chrono::year(__y) / __mwd; } |
2126 | |
2127 | friend constexpr year_month_weekday |
2128 | operator/(const month_weekday& __mwd, const chrono::year& __y) noexcept |
2129 | { return __y / __mwd; } |
2130 | |
2131 | friend constexpr year_month_weekday |
2132 | operator/(const month_weekday& __mwd, int __y) noexcept |
2133 | { return chrono::year(__y) / __mwd; } |
2134 | }; |
2135 | |
2136 | // YEAR_MONTH_WEEKDAY_LAST |
2137 | |
2138 | class year_month_weekday_last |
2139 | { |
2140 | private: |
2141 | chrono::year _M_y; |
2142 | chrono::month _M_m; |
2143 | chrono::weekday_last _M_wdl; |
2144 | |
2145 | public: |
2146 | constexpr |
2147 | year_month_weekday_last(const chrono::year& __y, const chrono::month& __m, |
2148 | const chrono::weekday_last& __wdl) noexcept |
2149 | : _M_y{__y}, _M_m{__m}, _M_wdl{__wdl} |
2150 | { } |
2151 | |
2152 | template<typename = __detail::__months_years_conversion_disambiguator> |
2153 | constexpr year_month_weekday_last& |
2154 | operator+=(const months& __m) noexcept |
2155 | { |
2156 | *this = *this + __m; |
2157 | return *this; |
2158 | } |
2159 | |
2160 | template<typename = __detail::__months_years_conversion_disambiguator> |
2161 | constexpr year_month_weekday_last& |
2162 | operator-=(const months& __m) noexcept |
2163 | { |
2164 | *this = *this - __m; |
2165 | return *this; |
2166 | } |
2167 | |
2168 | constexpr year_month_weekday_last& |
2169 | operator+=(const years& __y) noexcept |
2170 | { |
2171 | *this = *this + __y; |
2172 | return *this; |
2173 | } |
2174 | |
2175 | constexpr year_month_weekday_last& |
2176 | operator-=(const years& __y) noexcept |
2177 | { |
2178 | *this = *this - __y; |
2179 | return *this; |
2180 | } |
2181 | |
2182 | constexpr chrono::year |
2183 | year() const noexcept |
2184 | { return _M_y; } |
2185 | |
2186 | constexpr chrono::month |
2187 | month() const noexcept |
2188 | { return _M_m; } |
2189 | |
2190 | constexpr chrono::weekday |
2191 | weekday() const noexcept |
2192 | { return _M_wdl.weekday(); } |
2193 | |
2194 | constexpr chrono::weekday_last |
2195 | weekday_last() const noexcept |
2196 | { return _M_wdl; } |
2197 | |
2198 | constexpr |
2199 | operator sys_days() const noexcept |
2200 | { |
2201 | const auto __d = sys_days{_M_y / _M_m / last}; |
2202 | return sys_days{(__d - (chrono::weekday{__d} |
2203 | - _M_wdl.weekday())).time_since_epoch()}; |
2204 | } |
2205 | |
2206 | explicit constexpr |
2207 | operator local_days() const noexcept |
2208 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
2209 | |
2210 | constexpr bool |
2211 | ok() const noexcept |
2212 | { return _M_y.ok() && _M_m.ok() && _M_wdl.ok(); } |
2213 | |
2214 | friend constexpr bool |
2215 | operator==(const year_month_weekday_last& __x, |
2216 | const year_month_weekday_last& __y) noexcept |
2217 | { |
2218 | return __x.year() == __y.year() |
2219 | && __x.month() == __y.month() |
2220 | && __x.weekday_last() == __y.weekday_last(); |
2221 | } |
2222 | |
2223 | template<typename = __detail::__months_years_conversion_disambiguator> |
2224 | friend constexpr year_month_weekday_last |
2225 | operator+(const year_month_weekday_last& __ymwdl, |
2226 | const months& __dm) noexcept |
2227 | { |
2228 | return ((__ymwdl.year() / __ymwdl.month() + __dm) |
2229 | / __ymwdl.weekday_last()); |
2230 | } |
2231 | |
2232 | template<typename = __detail::__months_years_conversion_disambiguator> |
2233 | friend constexpr year_month_weekday_last |
2234 | operator+(const months& __dm, |
2235 | const year_month_weekday_last& __ymwdl) noexcept |
2236 | { return __ymwdl + __dm; } |
2237 | |
2238 | friend constexpr year_month_weekday_last |
2239 | operator+(const year_month_weekday_last& __ymwdl, |
2240 | const years& __dy) noexcept |
2241 | { return {__ymwdl.year() + __dy, __ymwdl.month(), __ymwdl.weekday_last()}; } |
2242 | |
2243 | friend constexpr year_month_weekday_last |
2244 | operator+(const years& __dy, |
2245 | const year_month_weekday_last& __ymwdl) noexcept |
2246 | { return __ymwdl + __dy; } |
2247 | |
2248 | template<typename = __detail::__months_years_conversion_disambiguator> |
2249 | friend constexpr year_month_weekday_last |
2250 | operator-(const year_month_weekday_last& __ymwdl, |
2251 | const months& __dm) noexcept |
2252 | { return __ymwdl + -__dm; } |
2253 | |
2254 | friend constexpr year_month_weekday_last |
2255 | operator-(const year_month_weekday_last& __ymwdl, |
2256 | const years& __dy) noexcept |
2257 | { return __ymwdl + -__dy; } |
2258 | |
2259 | friend constexpr year_month_weekday_last |
2260 | operator/(const year_month& __ym, |
2261 | const chrono::weekday_last& __wdl) noexcept |
2262 | { return {__ym.year(), __ym.month(), __wdl}; } |
2263 | |
2264 | friend constexpr year_month_weekday_last |
2265 | operator/(const chrono::year& __y, |
2266 | const chrono::month_weekday_last& __mwdl) noexcept |
2267 | { return {__y, __mwdl.month(), __mwdl.weekday_last()}; } |
2268 | |
2269 | friend constexpr year_month_weekday_last |
2270 | operator/(int __y, const chrono::month_weekday_last& __mwdl) noexcept |
2271 | { return chrono::year(__y) / __mwdl; } |
2272 | |
2273 | friend constexpr year_month_weekday_last |
2274 | operator/(const chrono::month_weekday_last& __mwdl, |
2275 | const chrono::year& __y) noexcept |
2276 | { return __y / __mwdl; } |
2277 | |
2278 | friend constexpr year_month_weekday_last |
2279 | operator/(const chrono::month_weekday_last& __mwdl, int __y) noexcept |
2280 | { return chrono::year(__y) / __mwdl; } |
2281 | }; |
2282 | |
2283 | // HH_MM_SS |
2284 | |
2285 | /// @cond undocumented |
2286 | namespace __detail |
2287 | { |
2288 | consteval long long |
2289 | __pow10(unsigned __n) |
2290 | { |
2291 | long long __r = 1; |
2292 | while (__n-- > 0) |
2293 | __r *= 10; |
2294 | return __r; |
2295 | } |
2296 | |
2297 | template<typename _Duration> struct __utc_leap_second; |
2298 | } |
2299 | /// @endcond |
2300 | |
2301 | /** Utility for splitting a duration into hours, minutes, and seconds |
2302 | * |
2303 | * This is a convenience type that provides accessors for the constituent |
2304 | * parts (hours, minutes, seconds and subseconds) of a duration. |
2305 | * |
2306 | * @since C++20 |
2307 | */ |
2308 | template<typename _Duration> |
2309 | class hh_mm_ss |
2310 | { |
2311 | static_assert( __is_duration<_Duration>::value ); |
2312 | |
2313 | private: |
2314 | static consteval int |
2315 | _S_fractional_width() |
2316 | { |
2317 | auto __den = _Duration::period::den; |
2318 | const int __multiplicity_2 = std::__countr_zero((uintmax_t)__den); |
2319 | __den >>= __multiplicity_2; |
2320 | int __multiplicity_5 = 0; |
2321 | while ((__den % 5) == 0) |
2322 | { |
2323 | ++__multiplicity_5; |
2324 | __den /= 5; |
2325 | } |
2326 | if (__den != 1) |
2327 | return 6; |
2328 | |
2329 | int __width = (__multiplicity_2 > __multiplicity_5 |
2330 | ? __multiplicity_2 : __multiplicity_5); |
2331 | if (__width > 18) |
2332 | __width = 18; |
2333 | return __width; |
2334 | } |
2335 | |
2336 | constexpr |
2337 | hh_mm_ss(_Duration __d, bool __is_neg) |
2338 | : _M_h (duration_cast<chrono::hours>(__d)), |
2339 | _M_m (duration_cast<chrono::minutes>(__d - hours())), |
2340 | _M_s (duration_cast<chrono::seconds>(__d - hours() - minutes())), |
2341 | _M_is_neg(__is_neg) |
2342 | { |
2343 | auto __ss = __d - hours() - minutes() - seconds(); |
2344 | if constexpr (treat_as_floating_point_v<typename precision::rep>) |
2345 | _M_ss._M_r = __ss.count(); |
2346 | else if constexpr (precision::period::den != 1) |
2347 | _M_ss._M_r = duration_cast<precision>(__ss).count(); |
2348 | } |
2349 | |
2350 | static constexpr _Duration |
2351 | _S_abs(_Duration __d) |
2352 | { |
2353 | if constexpr (numeric_limits<typename _Duration::rep>::is_signed) |
2354 | return chrono::abs(__d); |
2355 | else |
2356 | return __d; |
2357 | } |
2358 | |
2359 | public: |
2360 | static constexpr unsigned fractional_width = {_S_fractional_width()}; |
2361 | |
2362 | using precision |
2363 | = duration<common_type_t<typename _Duration::rep, |
2364 | chrono::seconds::rep>, |
2365 | ratio<1, __detail::__pow10(fractional_width)>>; |
2366 | |
2367 | constexpr hh_mm_ss() noexcept = default; |
2368 | |
2369 | constexpr explicit |
2370 | hh_mm_ss(_Duration __d) |
2371 | : hh_mm_ss(_S_abs(__d), __d < _Duration::zero()) |
2372 | { } |
2373 | |
2374 | constexpr bool |
2375 | is_negative() const noexcept |
2376 | { |
2377 | if constexpr (!_S_is_unsigned) |
2378 | return _M_is_neg; |
2379 | else |
2380 | return false; |
2381 | } |
2382 | |
2383 | constexpr chrono::hours |
2384 | hours() const noexcept |
2385 | { return _M_h; } |
2386 | |
2387 | constexpr chrono::minutes |
2388 | minutes() const noexcept |
2389 | { return _M_m; } |
2390 | |
2391 | constexpr chrono::seconds |
2392 | seconds() const noexcept |
2393 | { return _M_s; } |
2394 | |
2395 | constexpr precision |
2396 | subseconds() const noexcept |
2397 | { return static_cast<precision>(_M_ss); } |
2398 | |
2399 | constexpr explicit |
2400 | operator precision() const noexcept |
2401 | { return to_duration(); } |
2402 | |
2403 | constexpr precision |
2404 | to_duration() const noexcept |
2405 | { |
2406 | if constexpr (!_S_is_unsigned) |
2407 | if (_M_is_neg) |
2408 | return -(_M_h + _M_m + _M_s + subseconds()); |
2409 | return _M_h + _M_m + _M_s + subseconds(); |
2410 | } |
2411 | |
2412 | private: |
2413 | static constexpr bool _S_is_unsigned |
2414 | = __and_v<is_integral<typename _Duration::rep>, |
2415 | is_unsigned<typename _Duration::rep>>; |
2416 | |
2417 | template<typename _Ratio> |
2418 | using __byte_duration = duration<unsigned char, _Ratio>; |
2419 | |
2420 | // The type of the _M_ss member that holds the subsecond precision. |
2421 | template<typename _Dur> |
2422 | struct __subseconds |
2423 | { |
2424 | typename _Dur::rep _M_r{}; |
2425 | |
2426 | constexpr explicit |
2427 | operator _Dur() const noexcept |
2428 | { return _Dur(_M_r); } |
2429 | }; |
2430 | |
2431 | // An empty class if this precision doesn't need subseconds. |
2432 | template<typename _Rep> |
2433 | requires (!treat_as_floating_point_v<_Rep>) |
2434 | struct __subseconds<duration<_Rep, ratio<1>>> |
2435 | { |
2436 | constexpr explicit |
2437 | operator duration<_Rep, ratio<1>>() const noexcept |
2438 | { return {}; } |
2439 | }; |
2440 | |
2441 | // True if the maximum constructor argument can be represented in _Tp. |
2442 | template<typename _Tp> |
2443 | static constexpr bool __fits |
2444 | = duration_values<typename _Duration::rep>::max() |
2445 | <= duration_values<_Tp>::max(); |
2446 | |
2447 | template<typename _Rep, typename _Period> |
2448 | requires (!treat_as_floating_point_v<_Rep>) |
2449 | && ratio_less_v<_Period, ratio<1, 1>> |
2450 | && (ratio_greater_equal_v<_Period, ratio<1, 250>> |
2451 | || __fits<unsigned char>) |
2452 | struct __subseconds<duration<_Rep, _Period>> |
2453 | { |
2454 | unsigned char _M_r{}; |
2455 | |
2456 | constexpr explicit |
2457 | operator duration<_Rep, _Period>() const noexcept |
2458 | { return duration<_Rep, _Period>(_M_r); } |
2459 | }; |
2460 | |
2461 | template<typename _Rep, typename _Period> |
2462 | requires (!treat_as_floating_point_v<_Rep>) |
2463 | && ratio_less_v<_Period, ratio<1, 250>> |
2464 | && (ratio_greater_equal_v<_Period, ratio<1, 4000000000>> |
2465 | || __fits<uint_least32_t>) |
2466 | struct __subseconds<duration<_Rep, _Period>> |
2467 | { |
2468 | uint_least32_t _M_r{}; |
2469 | |
2470 | constexpr explicit |
2471 | operator duration<_Rep, _Period>() const noexcept |
2472 | { return duration<_Rep, _Period>(_M_r); } |
2473 | }; |
2474 | |
2475 | chrono::hours _M_h{}; |
2476 | __byte_duration<ratio<60>> _M_m{}; |
2477 | __byte_duration<ratio<1>> _M_s{}; |
2478 | bool _M_is_neg{}; |
2479 | __subseconds<precision> _M_ss{}; |
2480 | |
2481 | template<typename> friend struct __detail::__utc_leap_second; |
2482 | }; |
2483 | |
2484 | /// @cond undocumented |
2485 | namespace __detail |
2486 | { |
2487 | // Represents a time that is within a leap second insertion. |
2488 | template<typename _Duration> |
2489 | struct __utc_leap_second |
2490 | { |
2491 | explicit |
2492 | __utc_leap_second(const sys_time<_Duration>& __s) |
2493 | : _M_date(chrono::floor<days>(__s)), _M_time(__s - _M_date) |
2494 | { |
2495 | ++_M_time._M_s; |
2496 | } |
2497 | |
2498 | sys_days _M_date; |
2499 | hh_mm_ss<common_type_t<_Duration, days>> _M_time; |
2500 | }; |
2501 | } |
2502 | /// @endcond |
2503 | |
2504 | // 12/24 HOURS FUNCTIONS |
2505 | |
2506 | constexpr bool |
2507 | is_am(const hours& __h) noexcept |
2508 | { return 0h <= __h && __h <= 11h; } |
2509 | |
2510 | constexpr bool |
2511 | is_pm(const hours& __h) noexcept |
2512 | { return 12h <= __h && __h <= 23h; } |
2513 | |
2514 | constexpr hours |
2515 | make12(const hours& __h) noexcept |
2516 | { |
2517 | if (__h == 0h) |
2518 | return 12h; |
2519 | else if (__h > 12h) |
2520 | return __h - 12h; |
2521 | return __h; |
2522 | } |
2523 | |
2524 | constexpr hours |
2525 | make24(const hours& __h, bool __is_pm) noexcept |
2526 | { |
2527 | if (!__is_pm) |
2528 | { |
2529 | if (__h == 12h) |
2530 | return 0h; |
2531 | else |
2532 | return __h; |
2533 | } |
2534 | else |
2535 | { |
2536 | if (__h == 12h) |
2537 | return __h; |
2538 | else |
2539 | return __h + 12h; |
2540 | } |
2541 | } |
2542 | |
2543 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
2544 | // C++20 [time.zones] Time zones |
2545 | |
2546 | struct tzdb; |
2547 | |
2548 | struct sys_info |
2549 | { |
2550 | sys_seconds begin; |
2551 | sys_seconds end; |
2552 | seconds offset; |
2553 | minutes save; |
2554 | string abbrev; |
2555 | }; |
2556 | |
2557 | struct local_info |
2558 | { |
2559 | static constexpr int unique = 0; |
2560 | static constexpr int nonexistent = 1; |
2561 | static constexpr int ambiguous = 2; |
2562 | |
2563 | int result; |
2564 | sys_info first; |
2565 | sys_info second; |
2566 | }; |
2567 | |
2568 | class nonexistent_local_time : public runtime_error |
2569 | { |
2570 | public: |
2571 | template<typename _Duration> |
2572 | nonexistent_local_time(const local_time<_Duration>& __tp, |
2573 | const local_info& __i) |
2574 | : runtime_error(_S_make_what_str(__tp, __i)) |
2575 | { __glibcxx_assert(__i.result == local_info::nonexistent); } |
2576 | |
2577 | private: |
2578 | template<typename _Duration> |
2579 | static string |
2580 | _S_make_what_str(const local_time<_Duration>& __tp, |
2581 | const local_info& __i) |
2582 | { |
2583 | std::ostringstream __os; |
2584 | __os << __tp << " is in a gap between\n" |
2585 | << local_seconds(__i.first.end.time_since_epoch()) |
2586 | + __i.first.offset << ' ' << __i.first.abbrev << " and\n" |
2587 | << local_seconds(__i.second.begin.time_since_epoch()) |
2588 | + __i.second.offset << ' ' << __i.second.abbrev |
2589 | << " which are both equivalent to\n" |
2590 | << __i.first.end << " UTC" ; |
2591 | return std::move(__os).str(); |
2592 | } |
2593 | }; |
2594 | |
2595 | class ambiguous_local_time : public runtime_error |
2596 | { |
2597 | public: |
2598 | template<typename _Duration> |
2599 | ambiguous_local_time(const local_time<_Duration>& __tp, |
2600 | const local_info& __i) |
2601 | : runtime_error(_S_make_what_str(__tp, __i)) |
2602 | { __glibcxx_assert(__i.result == local_info::ambiguous); } |
2603 | |
2604 | private: |
2605 | template<typename _Duration> |
2606 | static string |
2607 | _S_make_what_str(const local_time<_Duration>& __tp, |
2608 | const local_info& __i) |
2609 | { |
2610 | std::ostringstream __os; |
2611 | __os << __tp << " is ambiguous. It could be\n" |
2612 | << __tp << ' ' << __i.first.abbrev << " == " |
2613 | << __tp - __i.first.offset << " UTC or\n" |
2614 | << __tp << ' ' << __i.second.abbrev << " == " |
2615 | << __tp - __i.second.offset << " UTC" ; |
2616 | return std::move(__os).str(); |
2617 | } |
2618 | }; |
2619 | |
2620 | template<typename _Duration> |
2621 | [[noreturn]] void |
2622 | __throw_bad_local_time(const local_time<_Duration>& __tp, |
2623 | const local_info& __i) |
2624 | { |
2625 | #if __cpp_exceptions |
2626 | if (__i.result == local_info::nonexistent) |
2627 | throw nonexistent_local_time(__tp, __i); |
2628 | throw ambiguous_local_time(__tp, __i); |
2629 | #else |
2630 | __builtin_abort(); |
2631 | #endif |
2632 | } |
2633 | |
2634 | enum class choose { earliest, latest }; |
2635 | |
2636 | class time_zone |
2637 | { |
2638 | public: |
2639 | time_zone(time_zone&&) = default; |
2640 | time_zone& operator=(time_zone&&) = default; |
2641 | |
2642 | ~time_zone(); |
2643 | |
2644 | [[nodiscard]] |
2645 | string_view name() const noexcept { return _M_name; } |
2646 | |
2647 | template<typename _Duration> |
2648 | sys_info |
2649 | get_info(const sys_time<_Duration>& __st) const |
2650 | { return _M_get_sys_info(chrono::floor<seconds>(__st)); } |
2651 | |
2652 | template<typename _Duration> |
2653 | local_info |
2654 | get_info(const local_time<_Duration>& __tp) const |
2655 | { return _M_get_local_info(chrono::floor<seconds>(__tp)); } |
2656 | |
2657 | template<typename _Duration> |
2658 | sys_time<common_type_t<_Duration, seconds>> |
2659 | to_sys(const local_time<_Duration>& __tp) const |
2660 | { |
2661 | local_info __info = get_info(__tp); |
2662 | |
2663 | if (__info.result != local_info::unique) |
2664 | __throw_bad_local_time(__tp, __info); |
2665 | |
2666 | return sys_time<_Duration>(__tp.time_since_epoch()) |
2667 | - __info.first.offset; |
2668 | } |
2669 | |
2670 | template<typename _Duration> |
2671 | sys_time<common_type_t<_Duration, seconds>> |
2672 | to_sys(const local_time<_Duration>& __tp, choose __z) const |
2673 | { |
2674 | local_info __info = get_info(__tp); |
2675 | |
2676 | if (__info.result == local_info::nonexistent) |
2677 | return __info.first.end; // Last second of the previous sys_info. |
2678 | |
2679 | sys_time<_Duration> __st(__tp.time_since_epoch()); |
2680 | |
2681 | if (__info.result == local_info::ambiguous && __z == choose::latest) |
2682 | return __st - __info.second.offset; // Time in the later sys_info. |
2683 | // else if __z == earliest, use __info.first.offset as below: |
2684 | |
2685 | return __st - __info.first.offset; |
2686 | } |
2687 | |
2688 | template<typename _Duration> |
2689 | local_time<common_type_t<_Duration, seconds>> |
2690 | to_local(const sys_time<_Duration>& __tp) const |
2691 | { |
2692 | auto __d = (__tp + get_info(__tp).offset).time_since_epoch(); |
2693 | return local_time<common_type_t<_Duration, seconds>>(__d); |
2694 | } |
2695 | |
2696 | [[nodiscard]] friend bool |
2697 | operator==(const time_zone& __x, const time_zone& __y) noexcept |
2698 | { return __x._M_name == __y._M_name; } |
2699 | |
2700 | [[nodiscard]] friend strong_ordering |
2701 | operator<=>(const time_zone& __x, const time_zone& __y) noexcept |
2702 | { return __x._M_name <=> __y._M_name; } |
2703 | |
2704 | private: |
2705 | sys_info _M_get_sys_info(sys_seconds) const; |
2706 | local_info _M_get_local_info(local_seconds) const; |
2707 | |
2708 | friend const tzdb& reload_tzdb(); |
2709 | friend struct tzdb; |
2710 | friend class tzdb_list; |
2711 | |
2712 | struct _Impl; |
2713 | |
2714 | explicit time_zone(unique_ptr<_Impl> __p); |
2715 | string _M_name; |
2716 | unique_ptr<_Impl> _M_impl; |
2717 | }; |
2718 | |
2719 | const time_zone* locate_zone(string_view __tz_name); |
2720 | const time_zone* current_zone(); |
2721 | |
2722 | /** The list of `chrono::tzdb` objects |
2723 | * |
2724 | * A single object of this type is constructed by the C++ runtime, |
2725 | * and can be accessed by calling `chrono::get_tzdb_list()`. |
2726 | * |
2727 | * The front of the list is the current `tzdb` object and can be accessed |
2728 | * via `chrono::get_tzdb_list().front()` or `chrono::get_tzdb()` or |
2729 | * `*chrono::get_tzdb_list().begin()`. |
2730 | * |
2731 | * The `chrono::reload_tzdb()` function will check for a newer version |
2732 | * and if found, insert it at the front of the list. |
2733 | * |
2734 | * @since C++20 |
2735 | */ |
2736 | class tzdb_list |
2737 | { |
2738 | struct _Node; |
2739 | |
2740 | public: |
2741 | tzdb_list(const tzdb_list&) = delete; |
2742 | tzdb_list& operator=(const tzdb_list&) = delete; |
2743 | |
2744 | /** An iterator into the `tzdb_list` |
2745 | * |
2746 | * As a extension, in libstdc++ each `tzdb` is reference-counted |
2747 | * and the `const_iterator` type shares ownership of the object it |
2748 | * refers to. This ensures that a `tzdb` erased from the list will |
2749 | * not be destroyed while there is an iterator that refers to it. |
2750 | */ |
2751 | class const_iterator |
2752 | { |
2753 | public: |
2754 | using value_type = tzdb; |
2755 | using reference = const tzdb&; |
2756 | using pointer = const tzdb*; |
2757 | using difference_type = ptrdiff_t; |
2758 | using iterator_category = forward_iterator_tag; |
2759 | |
2760 | constexpr const_iterator() = default; |
2761 | const_iterator(const const_iterator&) = default; |
2762 | const_iterator(const_iterator&&) = default; |
2763 | const_iterator& operator=(const const_iterator&) = default; |
2764 | const_iterator& operator=(const_iterator&&) = default; |
2765 | |
2766 | reference operator*() const noexcept; |
2767 | pointer operator->() const noexcept { return &**this; } |
2768 | const_iterator& operator++(); |
2769 | const_iterator operator++(int); |
2770 | |
2771 | bool operator==(const const_iterator&) const noexcept = default; |
2772 | |
2773 | private: |
2774 | explicit const_iterator(const shared_ptr<_Node>&) noexcept; |
2775 | |
2776 | friend class tzdb_list; |
2777 | |
2778 | shared_ptr<_Node> _M_node; |
2779 | void* _M_reserved = nullptr; |
2780 | }; |
2781 | |
2782 | /** Access the current `tzdb` at the front of the list. |
2783 | * |
2784 | * This returns a reference to the same object as `chrono::get_tzdb()`. |
2785 | * |
2786 | * @returns A reference to the current tzdb object. |
2787 | * @since C++20 |
2788 | */ |
2789 | const tzdb& front() const noexcept; |
2790 | |
2791 | /** Remove the tzdb object _after_ the one the iterator refers to. |
2792 | * |
2793 | * Calling this function concurently with any of `front()`, `begin()`, |
2794 | * or `end()` does not cause a data race, but in general this function |
2795 | * is not thread-safe. The behaviour may be undefined if erasing an |
2796 | * element from the list while another thread is calling the same |
2797 | * function, or incrementing an iterator into the list, or accessing |
2798 | * the element being erased (unless it is accessed through an iterator). |
2799 | * |
2800 | * @param __p A dereferenceable iterator. |
2801 | * @returns An iterator the element after the one that was erased |
2802 | * (or `end()` if there is no such element). |
2803 | * @since C++20 |
2804 | */ |
2805 | const_iterator erase_after(const_iterator __p); |
2806 | |
2807 | const_iterator begin() const noexcept; |
2808 | const_iterator end() const noexcept { return {}; } |
2809 | const_iterator cbegin() const noexcept { return begin(); } |
2810 | const_iterator cend() const noexcept { return end(); } |
2811 | |
2812 | private: |
2813 | constexpr explicit tzdb_list(nullptr_t); |
2814 | |
2815 | friend tzdb_list& get_tzdb_list(); |
2816 | friend const tzdb& get_tzdb(); |
2817 | friend const tzdb& reload_tzdb(); |
2818 | friend struct tzdb; |
2819 | friend class leap_second; |
2820 | friend struct time_zone::_Impl; |
2821 | friend class time_zone_link; |
2822 | }; |
2823 | |
2824 | class time_zone_link |
2825 | { |
2826 | public: |
2827 | time_zone_link(time_zone_link&&) = default; |
2828 | time_zone_link& operator=(time_zone_link&&) = default; |
2829 | |
2830 | string_view name() const noexcept { return _M_name; } |
2831 | string_view target() const noexcept { return _M_target; } |
2832 | |
2833 | friend bool |
2834 | operator==(const time_zone_link& __x, const time_zone_link& __y) noexcept |
2835 | { return __x.name() == __y.name(); } |
2836 | |
2837 | friend strong_ordering |
2838 | operator<=>(const time_zone_link& __x, const time_zone_link& __y) noexcept |
2839 | { return __x.name() <=> __y.name(); } |
2840 | |
2841 | private: |
2842 | friend const tzdb& reload_tzdb(); |
2843 | friend struct tzdb_list::_Node; |
2844 | |
2845 | explicit time_zone_link(nullptr_t) { } |
2846 | |
2847 | string _M_name; |
2848 | string _M_target; |
2849 | }; |
2850 | |
2851 | class leap_second |
2852 | { |
2853 | public: |
2854 | leap_second(const leap_second&) = default; |
2855 | leap_second& operator=(const leap_second&) = default; |
2856 | |
2857 | [[nodiscard]] |
2858 | constexpr sys_seconds |
2859 | date() const noexcept |
2860 | { |
2861 | if (_M_s >= _M_s.zero()) [[likely]] |
2862 | return sys_seconds(_M_s); |
2863 | return sys_seconds(-_M_s); |
2864 | } |
2865 | |
2866 | [[nodiscard]] |
2867 | constexpr seconds |
2868 | value() const noexcept |
2869 | { |
2870 | if (_M_s >= _M_s.zero()) [[likely]] |
2871 | return seconds(1); |
2872 | return seconds(-1); |
2873 | } |
2874 | |
2875 | // This can be defaulted because the database will never contain two |
2876 | // leap_second objects with the same date but different signs. |
2877 | [[nodiscard]] friend constexpr bool |
2878 | operator==(const leap_second&, const leap_second&) noexcept = default; |
2879 | |
2880 | [[nodiscard]] friend constexpr strong_ordering |
2881 | operator<=>(const leap_second& __x, const leap_second& __y) noexcept |
2882 | { return __x.date() <=> __y.date(); } |
2883 | |
2884 | template<typename _Duration> |
2885 | [[nodiscard]] friend constexpr bool |
2886 | operator==(const leap_second& __x, |
2887 | const sys_time<_Duration>& __y) noexcept |
2888 | { return __x.date() == __y; } |
2889 | |
2890 | template<typename _Duration> |
2891 | [[nodiscard]] friend constexpr bool |
2892 | operator<(const leap_second& __x, |
2893 | const sys_time<_Duration>& __y) noexcept |
2894 | { return __x.date() < __y; } |
2895 | |
2896 | template<typename _Duration> |
2897 | [[nodiscard]] friend constexpr bool |
2898 | operator<(const sys_time<_Duration>& __x, |
2899 | const leap_second& __y) noexcept |
2900 | { return __x < __y.date(); } |
2901 | |
2902 | template<typename _Duration> |
2903 | [[nodiscard]] friend constexpr bool |
2904 | operator>(const leap_second& __x, |
2905 | const sys_time<_Duration>& __y) noexcept |
2906 | { return __y < __x.date(); } |
2907 | |
2908 | template<typename _Duration> |
2909 | [[nodiscard]] friend constexpr bool |
2910 | operator>(const sys_time<_Duration>& __x, |
2911 | const leap_second& __y) noexcept |
2912 | { return __y.date() < __x; } |
2913 | |
2914 | template<typename _Duration> |
2915 | [[nodiscard]] friend constexpr bool |
2916 | operator<=(const leap_second& __x, |
2917 | const sys_time<_Duration>& __y) noexcept |
2918 | { return !(__y < __x.date()); } |
2919 | |
2920 | template<typename _Duration> |
2921 | [[nodiscard]] friend constexpr bool |
2922 | operator<=(const sys_time<_Duration>& __x, |
2923 | const leap_second& __y) noexcept |
2924 | { return !(__y.date() < __x); } |
2925 | |
2926 | template<typename _Duration> |
2927 | [[nodiscard]] friend constexpr bool |
2928 | operator>=(const leap_second& __x, |
2929 | const sys_time<_Duration>& __y) noexcept |
2930 | { return !(__x.date() < __y); } |
2931 | |
2932 | template<typename _Duration> |
2933 | [[nodiscard]] friend constexpr bool |
2934 | operator>=(const sys_time<_Duration>& __x, |
2935 | const leap_second& __y) noexcept |
2936 | { return !(__x < __y.date()); } |
2937 | |
2938 | template<three_way_comparable_with<seconds> _Duration> |
2939 | [[nodiscard]] friend constexpr auto |
2940 | operator<=>(const leap_second& __x, |
2941 | const sys_time<_Duration>& __y) noexcept |
2942 | { return __x.date() <=> __y; } |
2943 | |
2944 | private: |
2945 | explicit leap_second(seconds::rep __s) : _M_s(__s) { } |
2946 | |
2947 | friend struct tzdb_list::_Node; |
2948 | |
2949 | friend const tzdb& reload_tzdb(); |
2950 | |
2951 | template<typename _Duration> |
2952 | friend leap_second_info |
2953 | get_leap_second_info(const utc_time<_Duration>&); |
2954 | |
2955 | seconds _M_s; // == date().time_since_epoch() * value().count() |
2956 | }; |
2957 | |
2958 | template<class _Tp> struct zoned_traits { }; |
2959 | |
2960 | template<> |
2961 | struct zoned_traits<const time_zone*> |
2962 | { |
2963 | static const time_zone* |
2964 | default_zone() |
2965 | { return std::chrono::locate_zone("UTC" ); } |
2966 | |
2967 | static const time_zone* |
2968 | locate_zone(string_view __name) |
2969 | { return std::chrono::locate_zone(__name); } |
2970 | }; |
2971 | |
2972 | struct tzdb |
2973 | { |
2974 | string version; |
2975 | _GLIBCXX_STD_C::vector<time_zone> zones; |
2976 | _GLIBCXX_STD_C::vector<time_zone_link> links; |
2977 | _GLIBCXX_STD_C::vector<leap_second> leap_seconds; |
2978 | |
2979 | const time_zone* |
2980 | locate_zone(string_view __tz_name) const; |
2981 | |
2982 | const time_zone* |
2983 | current_zone() const; |
2984 | |
2985 | private: |
2986 | friend const tzdb& reload_tzdb(); |
2987 | friend class time_zone; |
2988 | friend struct tzdb_list::_Node; |
2989 | }; |
2990 | |
2991 | tzdb_list& get_tzdb_list(); |
2992 | const tzdb& get_tzdb(); |
2993 | |
2994 | const tzdb& reload_tzdb(); |
2995 | string remote_version(); |
2996 | |
2997 | template<typename _Duration, typename _TimeZonePtr = const time_zone*> |
2998 | class zoned_time |
2999 | { |
3000 | static_assert(__is_duration_v<_Duration>); |
3001 | |
3002 | using _Traits = zoned_traits<_TimeZonePtr>; |
3003 | |
3004 | // Every constructor that accepts a string_view as its first parameter |
3005 | // does not participate in class template argument deduction. |
3006 | using string_view = type_identity_t<std::string_view>; |
3007 | |
3008 | public: |
3009 | using duration = common_type_t<_Duration, seconds>; |
3010 | |
3011 | zoned_time() requires requires { _Traits::default_zone(); } |
3012 | { } |
3013 | |
3014 | zoned_time(const zoned_time&) = default; |
3015 | zoned_time& operator=(const zoned_time&) = default; |
3016 | |
3017 | zoned_time(const sys_time<_Duration>& __st) |
3018 | requires requires { _Traits::default_zone(); } |
3019 | : _M_tp(__st) |
3020 | { } |
3021 | |
3022 | explicit |
3023 | zoned_time(_TimeZonePtr __z) : _M_zone(std::move(__z)) { } |
3024 | |
3025 | explicit |
3026 | zoned_time(string_view __name) |
3027 | requires requires { |
3028 | _TimeZonePtr{_Traits::locate_zone(std::string_view{})}; |
3029 | } |
3030 | : _M_zone(_Traits::locate_zone(__name)) |
3031 | { } |
3032 | |
3033 | template<typename _Duration2> |
3034 | zoned_time(const zoned_time<_Duration2, _TimeZonePtr>& __zt) |
3035 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
3036 | : _M_zone(__zt._M_zone), _M_tp(__zt._M_tp) |
3037 | { } |
3038 | |
3039 | zoned_time(_TimeZonePtr __z, const sys_time<_Duration>& __st) |
3040 | : _M_zone(std::move(__z)), _M_tp(__st) |
3041 | { } |
3042 | |
3043 | zoned_time(string_view __name, const sys_time<_Duration>& __st) |
3044 | : zoned_time(_Traits::locate_zone(__name), __st) |
3045 | { } |
3046 | |
3047 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp) |
3048 | requires requires { |
3049 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; |
3050 | } |
3051 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp)) |
3052 | { } |
3053 | |
3054 | zoned_time(string_view __name, const local_time<_Duration>& __tp) |
3055 | requires requires (_TimeZonePtr __z) { |
3056 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
3057 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; |
3058 | } |
3059 | : zoned_time(_Traits::locate_zone(__name), __tp) |
3060 | { } |
3061 | |
3062 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp, |
3063 | choose __c) |
3064 | requires requires { |
3065 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; |
3066 | } |
3067 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp, __c)) |
3068 | { } |
3069 | |
3070 | zoned_time(string_view __name, const local_time<_Duration>& __tp, |
3071 | choose __c) |
3072 | requires requires (_TimeZonePtr __z) { |
3073 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
3074 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; |
3075 | } |
3076 | : _M_zone(_Traits::locate_zone(__name)), |
3077 | _M_tp(_M_zone->to_sys(__tp, __c)) |
3078 | { } |
3079 | |
3080 | template<typename _Duration2, typename _TimeZonePtr2> |
3081 | zoned_time(_TimeZonePtr __z, |
3082 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) |
3083 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
3084 | : _M_zone(__z), _M_tp(__zt._M_tp) |
3085 | { } |
3086 | |
3087 | template<typename _Duration2, typename _TimeZonePtr2> |
3088 | zoned_time(_TimeZonePtr __z, |
3089 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, |
3090 | choose) |
3091 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
3092 | : _M_zone(__z), _M_tp(__zt._M_tp) |
3093 | { } |
3094 | |
3095 | template<typename _Duration2, typename _TimeZonePtr2> |
3096 | zoned_time(string_view __name, |
3097 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) |
3098 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
3099 | && requires { |
3100 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
3101 | } |
3102 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) |
3103 | { } |
3104 | |
3105 | template<typename _Duration2, typename _TimeZonePtr2> |
3106 | zoned_time(string_view __name, |
3107 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, |
3108 | choose) |
3109 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
3110 | && requires { |
3111 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
3112 | } |
3113 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) |
3114 | { } |
3115 | |
3116 | zoned_time& |
3117 | operator=(const sys_time<_Duration>& __st) |
3118 | { |
3119 | _M_tp = __st; |
3120 | return *this; |
3121 | } |
3122 | |
3123 | zoned_time& |
3124 | operator=(const local_time<_Duration>& __lt) |
3125 | { |
3126 | _M_tp = _M_zone->to_sys(__lt); |
3127 | return *this; |
3128 | } |
3129 | |
3130 | [[nodiscard]] |
3131 | operator sys_time<duration>() const { return _M_tp; } |
3132 | |
3133 | [[nodiscard]] |
3134 | explicit operator local_time<duration>() const |
3135 | { return get_local_time(); } |
3136 | |
3137 | [[nodiscard]] |
3138 | _TimeZonePtr |
3139 | get_time_zone() const |
3140 | { return _M_zone; } |
3141 | |
3142 | [[nodiscard]] |
3143 | local_time<duration> |
3144 | get_local_time() const |
3145 | { return _M_zone->to_local(_M_tp); } |
3146 | |
3147 | [[nodiscard]] |
3148 | sys_time<duration> |
3149 | get_sys_time() const |
3150 | { return _M_tp; } |
3151 | |
3152 | [[nodiscard]] |
3153 | sys_info |
3154 | get_info() const |
3155 | { return _M_zone->get_info(_M_tp); } |
3156 | |
3157 | [[nodiscard]] friend bool |
3158 | operator==(const zoned_time&, const zoned_time&) = default; |
3159 | |
3160 | private: |
3161 | _TimeZonePtr _M_zone{ _Traits::default_zone() }; |
3162 | sys_time<duration> _M_tp{}; |
3163 | |
3164 | template<typename _Duration2, typename _TimeZonePtr2> |
3165 | friend class zoned_time; |
3166 | }; |
3167 | |
3168 | zoned_time() -> zoned_time<seconds>; |
3169 | |
3170 | template<typename _Duration> |
3171 | zoned_time(sys_time<_Duration>) |
3172 | -> zoned_time<common_type_t<_Duration, seconds>>; |
3173 | |
3174 | /// @cond undocumented |
3175 | template<typename _TimeZonePtrOrName> |
3176 | using __time_zone_representation |
3177 | = __conditional_t<is_convertible_v<_TimeZonePtrOrName, string_view>, |
3178 | const time_zone*, |
3179 | remove_cvref_t<_TimeZonePtrOrName>>; |
3180 | /// @endcond |
3181 | |
3182 | template<typename _TimeZonePtrOrName> |
3183 | zoned_time(_TimeZonePtrOrName&&) |
3184 | -> zoned_time<seconds, __time_zone_representation<_TimeZonePtrOrName>>; |
3185 | |
3186 | template<typename _TimeZonePtrOrName, typename _Duration> |
3187 | zoned_time(_TimeZonePtrOrName&&, sys_time<_Duration>) |
3188 | -> zoned_time<common_type_t<_Duration, seconds>, |
3189 | __time_zone_representation<_TimeZonePtrOrName>>; |
3190 | |
3191 | template<typename _TimeZonePtrOrName, typename _Duration> |
3192 | zoned_time(_TimeZonePtrOrName&&, local_time<_Duration>, |
3193 | choose = choose::earliest) |
3194 | -> zoned_time<common_type_t<_Duration, seconds>, |
3195 | __time_zone_representation<_TimeZonePtrOrName>>; |
3196 | |
3197 | template<typename _Duration, typename _TimeZonePtrOrName, |
3198 | typename _TimeZonePtr2> |
3199 | zoned_time(_TimeZonePtrOrName&&, zoned_time<_Duration, _TimeZonePtr2>, |
3200 | choose = choose::earliest) |
3201 | -> zoned_time<common_type_t<_Duration, seconds>, |
3202 | __time_zone_representation<_TimeZonePtrOrName>>; |
3203 | |
3204 | template<typename _Dur1, typename _TZPtr1, typename _Dur2, typename _TZPtr2> |
3205 | [[nodiscard]] |
3206 | inline bool |
3207 | operator==(const zoned_time<_Dur1, _TZPtr1>& __x, |
3208 | const zoned_time<_Dur2, _TZPtr2>& __y) |
3209 | { |
3210 | return __x.get_time_zone() == __y.get_time_zone() |
3211 | && __x.get_sys_time() == __y.get_sys_time(); |
3212 | } |
3213 | |
3214 | using zoned_seconds = zoned_time<seconds>; |
3215 | #endif // _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
3216 | |
3217 | namespace __detail |
3218 | { |
3219 | inline leap_second_info |
3220 | __get_leap_second_info(sys_seconds __ss, bool __is_utc) |
3221 | { |
3222 | if (__ss < sys_seconds{}) [[unlikely]] |
3223 | return {}; |
3224 | |
3225 | const seconds::rep __leaps[] { |
3226 | 78796800, // 1 Jul 1972 |
3227 | 94694400, // 1 Jan 1973 |
3228 | 126230400, // 1 Jan 1974 |
3229 | 157766400, // 1 Jan 1975 |
3230 | 189302400, // 1 Jan 1976 |
3231 | 220924800, // 1 Jan 1977 |
3232 | 252460800, // 1 Jan 1978 |
3233 | 283996800, // 1 Jan 1979 |
3234 | 315532800, // 1 Jan 1980 |
3235 | 362793600, // 1 Jul 1981 |
3236 | 394329600, // 1 Jul 1982 |
3237 | 425865600, // 1 Jul 1983 |
3238 | 489024000, // 1 Jul 1985 |
3239 | 567993600, // 1 Jan 1988 |
3240 | 631152000, // 1 Jan 1990 |
3241 | 662688000, // 1 Jan 1991 |
3242 | 709948800, // 1 Jul 1992 |
3243 | 741484800, // 1 Jul 1993 |
3244 | 773020800, // 1 Jul 1994 |
3245 | 820454400, // 1 Jan 1996 |
3246 | 867715200, // 1 Jul 1997 |
3247 | 915148800, // 1 Jan 1999 |
3248 | 1136073600, // 1 Jan 2006 |
3249 | 1230768000, // 1 Jan 2009 |
3250 | 1341100800, // 1 Jul 2012 |
3251 | 1435708800, // 1 Jul 2015 |
3252 | 1483228800, // 1 Jan 2017 |
3253 | }; |
3254 | // The list above is known to be valid until (at least) this date |
3255 | // and only contains positive leap seconds. |
3256 | const sys_seconds __expires(1735344000s); // 2024-12-28 00:00:00 UTC |
3257 | |
3258 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
3259 | if (__ss > __expires) |
3260 | { |
3261 | // Use updated leap_seconds from tzdb. |
3262 | size_t __n = std::size(__leaps); |
3263 | |
3264 | auto __db = get_tzdb_list().begin(); |
3265 | auto __first = __db->leap_seconds.begin() + __n; |
3266 | auto __last = __db->leap_seconds.end(); |
3267 | auto __pos = std::upper_bound(__first, __last, __ss); |
3268 | seconds __elapsed(__n); |
3269 | for (auto __i = __first; __i != __pos; ++__i) |
3270 | __elapsed += __i->value(); |
3271 | |
3272 | if (__is_utc) |
3273 | { |
3274 | // Convert utc_time to sys_time: |
3275 | __ss -= __elapsed; |
3276 | // See if that sys_time is before (or during) previous leap sec: |
3277 | if (__pos != __first && __ss < __pos[-1]) |
3278 | { |
3279 | if ((__ss + 1s) >= __pos[-1]) |
3280 | return {true, __elapsed}; |
3281 | __elapsed -= __pos[-1].value(); |
3282 | } |
3283 | } |
3284 | return {false, __elapsed}; |
3285 | } |
3286 | else |
3287 | #endif |
3288 | { |
3289 | seconds::rep __s = __ss.time_since_epoch().count(); |
3290 | const seconds::rep* __first = std::begin(__leaps); |
3291 | const seconds::rep* __last = std::end(__leaps); |
3292 | |
3293 | // Don't bother searching the list if we're after the last one. |
3294 | if (__s > (__last[-1] + (__last - __first) + 1)) |
3295 | return { false, seconds(__last - __first) }; |
3296 | |
3297 | auto __pos = std::upper_bound(__first, __last, __s); |
3298 | seconds __elapsed{__pos - __first}; |
3299 | if (__is_utc) |
3300 | { |
3301 | // Convert utc_time to sys_time: |
3302 | __s -= __elapsed.count(); |
3303 | // See if that sys_time is before (or during) previous leap sec: |
3304 | if (__pos != __first && __s < __pos[-1]) |
3305 | { |
3306 | if ((__s + 1) >= __pos[-1]) |
3307 | return {true, __elapsed}; |
3308 | --__elapsed; |
3309 | } |
3310 | } |
3311 | return {false, __elapsed}; |
3312 | } |
3313 | } |
3314 | } // namespace __detail |
3315 | |
3316 | template<typename _Duration> |
3317 | [[nodiscard]] |
3318 | inline leap_second_info |
3319 | get_leap_second_info(const utc_time<_Duration>& __ut) |
3320 | { |
3321 | auto __s = chrono::duration_cast<seconds>(__ut.time_since_epoch()); |
3322 | return __detail::__get_leap_second_info(sys_seconds(__s), true); |
3323 | } |
3324 | |
3325 | template<typename _Duration> |
3326 | [[nodiscard]] |
3327 | inline utc_time<common_type_t<_Duration, seconds>> |
3328 | utc_clock::from_sys(const sys_time<_Duration>& __t) |
3329 | { |
3330 | using _CDur = common_type_t<_Duration, seconds>; |
3331 | auto __s = chrono::time_point_cast<seconds>(__t); |
3332 | const auto __li = __detail::__get_leap_second_info(__s, false); |
3333 | return utc_time<_CDur>{__t.time_since_epoch()} + __li.elapsed; |
3334 | } |
3335 | |
3336 | /// @} group chrono |
3337 | #endif // C++20 |
3338 | } // namespace chrono |
3339 | |
3340 | #if __cplusplus >= 202002L |
3341 | inline namespace literals |
3342 | { |
3343 | inline namespace chrono_literals |
3344 | { |
3345 | /// @addtogroup chrono |
3346 | /// @{ |
3347 | #pragma GCC diagnostic push |
3348 | #pragma GCC diagnostic ignored "-Wliteral-suffix" |
3349 | /// Literal suffix for creating chrono::day objects. |
3350 | /// @since C++20 |
3351 | constexpr chrono::day |
3352 | operator"" d(unsigned long long __d) noexcept |
3353 | { return chrono::day{static_cast<unsigned>(__d)}; } |
3354 | |
3355 | /// Literal suffix for creating chrono::year objects. |
3356 | /// @since C++20 |
3357 | constexpr chrono::year |
3358 | operator"" y(unsigned long long __y) noexcept |
3359 | { return chrono::year{static_cast<int>(__y)}; } |
3360 | #pragma GCC diagnostic pop |
3361 | /// @} |
3362 | } // inline namespace chrono_literals |
3363 | } // inline namespace literals |
3364 | #endif // C++20 |
3365 | |
3366 | _GLIBCXX_END_NAMESPACE_VERSION |
3367 | } // namespace std |
3368 | |
3369 | #if __cplusplus >= 202002L |
3370 | # include <bits/chrono_io.h> |
3371 | #endif |
3372 | |
3373 | #endif // C++11 |
3374 | |
3375 | #endif //_GLIBCXX_CHRONO |
3376 | |