| 1 | // <chrono> -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2008-2024 Free Software Foundation, Inc. |
| 4 | // |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
| 6 | // software; you can redistribute it and/or modify it under the |
| 7 | // terms of the GNU General Public License as published by the |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 9 | // any later version. |
| 10 | |
| 11 | // This library is distributed in the hope that it will be useful, |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | // GNU General Public License for more details. |
| 15 | |
| 16 | // Under Section 7 of GPL version 3, you are granted additional |
| 17 | // permissions described in the GCC Runtime Library Exception, version |
| 18 | // 3.1, as published by the Free Software Foundation. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License and |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 | // <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | /** @file include/chrono |
| 26 | * This is a Standard C++ Library header. |
| 27 | * @ingroup chrono |
| 28 | */ |
| 29 | |
| 30 | #ifndef _GLIBCXX_CHRONO |
| 31 | #define _GLIBCXX_CHRONO 1 |
| 32 | |
| 33 | #pragma GCC system_header |
| 34 | |
| 35 | #include <bits/requires_hosted.h> // for <ctime> and clocks |
| 36 | |
| 37 | #if __cplusplus < 201103L |
| 38 | # include <bits/c++0x_warning.h> |
| 39 | #else |
| 40 | |
| 41 | #include <bits/chrono.h> |
| 42 | |
| 43 | #if __cplusplus >= 202002L |
| 44 | # include <bit> |
| 45 | # include <sstream> |
| 46 | # include <string> |
| 47 | # include <vector> |
| 48 | # include <bits/stl_algo.h> // upper_bound |
| 49 | # include <bits/shared_ptr.h> |
| 50 | # include <bits/unique_ptr.h> |
| 51 | #endif |
| 52 | |
| 53 | #define __glibcxx_want_chrono |
| 54 | #define __glibcxx_want_chrono_udls |
| 55 | #include <bits/version.h> |
| 56 | |
| 57 | namespace std _GLIBCXX_VISIBILITY(default) |
| 58 | { |
| 59 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 60 | |
| 61 | /** |
| 62 | * @defgroup chrono Time |
| 63 | * @ingroup utilities |
| 64 | * |
| 65 | * Classes and functions for time. |
| 66 | * |
| 67 | * @since C++11 |
| 68 | */ |
| 69 | |
| 70 | /** @namespace std::chrono |
| 71 | * @brief ISO C++ 2011 namespace for date and time utilities |
| 72 | * @ingroup chrono |
| 73 | */ |
| 74 | namespace chrono |
| 75 | { |
| 76 | #if __cplusplus >= 202002L |
| 77 | /// @addtogroup chrono |
| 78 | /// @{ |
| 79 | struct local_t { }; |
| 80 | template<typename _Duration> |
| 81 | using local_time = time_point<local_t, _Duration>; |
| 82 | using local_seconds = local_time<seconds>; |
| 83 | using local_days = local_time<days>; |
| 84 | |
| 85 | class utc_clock; |
| 86 | class tai_clock; |
| 87 | class gps_clock; |
| 88 | |
| 89 | template<typename _Duration> |
| 90 | using utc_time = time_point<utc_clock, _Duration>; |
| 91 | using utc_seconds = utc_time<seconds>; |
| 92 | |
| 93 | template<typename _Duration> |
| 94 | using tai_time = time_point<tai_clock, _Duration>; |
| 95 | using tai_seconds = tai_time<seconds>; |
| 96 | |
| 97 | template<typename _Duration> |
| 98 | using gps_time = time_point<gps_clock, _Duration>; |
| 99 | using gps_seconds = gps_time<seconds>; |
| 100 | |
| 101 | template<> struct is_clock<utc_clock> : true_type { }; |
| 102 | template<> struct is_clock<tai_clock> : true_type { }; |
| 103 | template<> struct is_clock<gps_clock> : true_type { }; |
| 104 | |
| 105 | template<> inline constexpr bool is_clock_v<utc_clock> = true; |
| 106 | template<> inline constexpr bool is_clock_v<tai_clock> = true; |
| 107 | template<> inline constexpr bool is_clock_v<gps_clock> = true; |
| 108 | |
| 109 | struct leap_second_info |
| 110 | { |
| 111 | bool is_leap_second; |
| 112 | seconds elapsed; |
| 113 | }; |
| 114 | |
| 115 | template<typename _Duration> |
| 116 | leap_second_info |
| 117 | get_leap_second_info(const utc_time<_Duration>& __ut); |
| 118 | |
| 119 | /** A clock that measures Universal Coordinated Time (UTC). |
| 120 | * |
| 121 | * The epoch is 1970-01-01 00:00:00. |
| 122 | * |
| 123 | * @since C++20 |
| 124 | */ |
| 125 | class utc_clock |
| 126 | { |
| 127 | public: |
| 128 | using rep = system_clock::rep; |
| 129 | using period = system_clock::period; |
| 130 | using duration = chrono::duration<rep, period>; |
| 131 | using time_point = chrono::time_point<utc_clock>; |
| 132 | static constexpr bool is_steady = false; |
| 133 | |
| 134 | [[nodiscard]] |
| 135 | static time_point |
| 136 | now() |
| 137 | { return from_sys(t: system_clock::now()); } |
| 138 | |
| 139 | template<typename _Duration> |
| 140 | [[nodiscard]] |
| 141 | static sys_time<common_type_t<_Duration, seconds>> |
| 142 | to_sys(const utc_time<_Duration>& __t) |
| 143 | { |
| 144 | using _CDur = common_type_t<_Duration, seconds>; |
| 145 | const auto __li = chrono::get_leap_second_info(__t); |
| 146 | sys_time<_CDur> __s{__t.time_since_epoch() - __li.elapsed}; |
| 147 | if (__li.is_leap_second) |
| 148 | __s = chrono::floor<seconds>(__s) + seconds{1} - _CDur{1}; |
| 149 | return __s; |
| 150 | } |
| 151 | |
| 152 | template<typename _Duration> |
| 153 | [[nodiscard]] |
| 154 | static utc_time<common_type_t<_Duration, seconds>> |
| 155 | from_sys(const sys_time<_Duration>& __t); |
| 156 | }; |
| 157 | |
| 158 | /** A clock that measures International Atomic Time. |
| 159 | * |
| 160 | * The epoch is 1958-01-01 00:00:00. |
| 161 | * |
| 162 | * @since C++20 |
| 163 | */ |
| 164 | class tai_clock |
| 165 | { |
| 166 | public: |
| 167 | using rep = system_clock::rep; |
| 168 | using period = system_clock::period; |
| 169 | using duration = chrono::duration<rep, period>; |
| 170 | using time_point = chrono::time_point<tai_clock>; |
| 171 | static constexpr bool is_steady = false; // XXX true for CLOCK_TAI? |
| 172 | |
| 173 | // TODO move into lib, use CLOCK_TAI on linux, add extension point. |
| 174 | [[nodiscard]] |
| 175 | static time_point |
| 176 | now() |
| 177 | { return from_utc(t: utc_clock::now()); } |
| 178 | |
| 179 | template<typename _Duration> |
| 180 | [[nodiscard]] |
| 181 | static utc_time<common_type_t<_Duration, seconds>> |
| 182 | to_utc(const tai_time<_Duration>& __t) |
| 183 | { |
| 184 | using _CDur = common_type_t<_Duration, seconds>; |
| 185 | return utc_time<_CDur>{__t.time_since_epoch()} - 378691210s; |
| 186 | } |
| 187 | |
| 188 | template<typename _Duration> |
| 189 | [[nodiscard]] |
| 190 | static tai_time<common_type_t<_Duration, seconds>> |
| 191 | from_utc(const utc_time<_Duration>& __t) |
| 192 | { |
| 193 | using _CDur = common_type_t<_Duration, seconds>; |
| 194 | return tai_time<_CDur>{__t.time_since_epoch()} + 378691210s; |
| 195 | } |
| 196 | }; |
| 197 | |
| 198 | /** A clock that measures GPS time. |
| 199 | * |
| 200 | * The epoch is 1980-01-06 00:00:00. |
| 201 | * |
| 202 | * @since C++20 |
| 203 | */ |
| 204 | class gps_clock |
| 205 | { |
| 206 | public: |
| 207 | using rep = system_clock::rep; |
| 208 | using period = system_clock::period; |
| 209 | using duration = chrono::duration<rep, period>; |
| 210 | using time_point = chrono::time_point<gps_clock>; |
| 211 | static constexpr bool is_steady = false; // XXX |
| 212 | |
| 213 | // TODO move into lib, add extension point. |
| 214 | [[nodiscard]] |
| 215 | static time_point |
| 216 | now() |
| 217 | { return from_utc(t: utc_clock::now()); } |
| 218 | |
| 219 | template<typename _Duration> |
| 220 | [[nodiscard]] |
| 221 | static utc_time<common_type_t<_Duration, seconds>> |
| 222 | to_utc(const gps_time<_Duration>& __t) |
| 223 | { |
| 224 | using _CDur = common_type_t<_Duration, seconds>; |
| 225 | return utc_time<_CDur>{__t.time_since_epoch()} + 315964809s; |
| 226 | } |
| 227 | |
| 228 | template<typename _Duration> |
| 229 | [[nodiscard]] |
| 230 | static gps_time<common_type_t<_Duration, seconds>> |
| 231 | from_utc(const utc_time<_Duration>& __t) |
| 232 | { |
| 233 | using _CDur = common_type_t<_Duration, seconds>; |
| 234 | return gps_time<_CDur>{__t.time_since_epoch()} - 315964809s; |
| 235 | } |
| 236 | }; |
| 237 | |
| 238 | |
| 239 | template<typename _DestClock, typename _SourceClock> |
| 240 | struct clock_time_conversion |
| 241 | { }; |
| 242 | |
| 243 | // Identity conversions |
| 244 | |
| 245 | template<typename _Clock> |
| 246 | struct clock_time_conversion<_Clock, _Clock> |
| 247 | { |
| 248 | template<typename _Duration> |
| 249 | time_point<_Clock, _Duration> |
| 250 | operator()(const time_point<_Clock, _Duration>& __t) const |
| 251 | { return __t; } |
| 252 | }; |
| 253 | |
| 254 | template<> |
| 255 | struct clock_time_conversion<system_clock, system_clock> |
| 256 | { |
| 257 | template<typename _Duration> |
| 258 | sys_time<_Duration> |
| 259 | operator()(const sys_time<_Duration>& __t) const |
| 260 | { return __t; } |
| 261 | }; |
| 262 | |
| 263 | template<> |
| 264 | struct clock_time_conversion<utc_clock, utc_clock> |
| 265 | { |
| 266 | template<typename _Duration> |
| 267 | utc_time<_Duration> |
| 268 | operator()(const utc_time<_Duration>& __t) const |
| 269 | { return __t; } |
| 270 | }; |
| 271 | |
| 272 | // Conversions between system_clock and utc_clock |
| 273 | |
| 274 | template<> |
| 275 | struct clock_time_conversion<utc_clock, system_clock> |
| 276 | { |
| 277 | template<typename _Duration> |
| 278 | utc_time<common_type_t<_Duration, seconds>> |
| 279 | operator()(const sys_time<_Duration>& __t) const |
| 280 | { return utc_clock::from_sys(__t); } |
| 281 | }; |
| 282 | |
| 283 | template<> |
| 284 | struct clock_time_conversion<system_clock, utc_clock> |
| 285 | { |
| 286 | template<typename _Duration> |
| 287 | sys_time<common_type_t<_Duration, seconds>> |
| 288 | operator()(const utc_time<_Duration>& __t) const |
| 289 | { return utc_clock::to_sys(__t); } |
| 290 | }; |
| 291 | |
| 292 | template<typename _Tp, typename _Clock> |
| 293 | inline constexpr bool __is_time_point_for_v = false; |
| 294 | |
| 295 | template<typename _Clock, typename _Duration> |
| 296 | inline constexpr bool |
| 297 | __is_time_point_for_v<time_point<_Clock, _Duration>, _Clock> = true; |
| 298 | |
| 299 | // Conversions between system_clock and other clocks |
| 300 | |
| 301 | template<typename _SourceClock> |
| 302 | struct clock_time_conversion<system_clock, _SourceClock> |
| 303 | { |
| 304 | template<typename _Duration, typename _Src = _SourceClock> |
| 305 | auto |
| 306 | operator()(const time_point<_SourceClock, _Duration>& __t) const |
| 307 | -> decltype(_Src::to_sys(__t)) |
| 308 | { |
| 309 | using _Ret = decltype(_SourceClock::to_sys(__t)); |
| 310 | static_assert(__is_time_point_for_v<_Ret, system_clock>); |
| 311 | return _SourceClock::to_sys(__t); |
| 312 | } |
| 313 | }; |
| 314 | |
| 315 | template<typename _DestClock> |
| 316 | struct clock_time_conversion<_DestClock, system_clock> |
| 317 | { |
| 318 | template<typename _Duration, typename _Dest = _DestClock> |
| 319 | auto |
| 320 | operator()(const sys_time<_Duration>& __t) const |
| 321 | -> decltype(_Dest::from_sys(__t)) |
| 322 | { |
| 323 | using _Ret = decltype(_DestClock::from_sys(__t)); |
| 324 | static_assert(__is_time_point_for_v<_Ret, _DestClock>); |
| 325 | return _DestClock::from_sys(__t); |
| 326 | } |
| 327 | }; |
| 328 | |
| 329 | // Conversions between utc_clock and other clocks |
| 330 | |
| 331 | template<typename _SourceClock> |
| 332 | struct clock_time_conversion<utc_clock, _SourceClock> |
| 333 | { |
| 334 | template<typename _Duration, typename _Src = _SourceClock> |
| 335 | auto |
| 336 | operator()(const time_point<_SourceClock, _Duration>& __t) const |
| 337 | -> decltype(_Src::to_utc(__t)) |
| 338 | { |
| 339 | using _Ret = decltype(_SourceClock::to_utc(__t)); |
| 340 | static_assert(__is_time_point_for_v<_Ret, utc_clock>); |
| 341 | return _SourceClock::to_utc(__t); |
| 342 | } |
| 343 | }; |
| 344 | |
| 345 | template<typename _DestClock> |
| 346 | struct clock_time_conversion<_DestClock, utc_clock> |
| 347 | { |
| 348 | template<typename _Duration, typename _Dest = _DestClock> |
| 349 | auto |
| 350 | operator()(const utc_time<_Duration>& __t) const |
| 351 | -> decltype(_Dest::from_utc(__t)) |
| 352 | { |
| 353 | using _Ret = decltype(_DestClock::from_utc(__t)); |
| 354 | static_assert(__is_time_point_for_v<_Ret, _DestClock>); |
| 355 | return _DestClock::from_utc(__t); |
| 356 | } |
| 357 | }; |
| 358 | |
| 359 | /// @cond undocumented |
| 360 | namespace __detail |
| 361 | { |
| 362 | template<typename _DestClock, typename _SourceClock, typename _Duration> |
| 363 | concept __clock_convs |
| 364 | = requires (const time_point<_SourceClock, _Duration>& __t) { |
| 365 | clock_time_conversion<_DestClock, _SourceClock>{}(__t); |
| 366 | }; |
| 367 | |
| 368 | template<typename _DestClock, typename _SourceClock, typename _Duration> |
| 369 | concept __clock_convs_sys |
| 370 | = requires (const time_point<_SourceClock, _Duration>& __t) { |
| 371 | clock_time_conversion<_DestClock, system_clock>{}( |
| 372 | clock_time_conversion<system_clock, _SourceClock>{}(__t)); |
| 373 | }; |
| 374 | |
| 375 | template<typename _DestClock, typename _SourceClock, typename _Duration> |
| 376 | concept __clock_convs_utc |
| 377 | = requires (const time_point<_SourceClock, _Duration>& __t) { |
| 378 | clock_time_conversion<_DestClock, utc_clock>{}( |
| 379 | clock_time_conversion<utc_clock, _SourceClock>{}(__t)); |
| 380 | }; |
| 381 | |
| 382 | template<typename _DestClock, typename _SourceClock, typename _Duration> |
| 383 | concept __clock_convs_sys_utc |
| 384 | = requires (const time_point<_SourceClock, _Duration>& __t) { |
| 385 | clock_time_conversion<_DestClock, utc_clock>{}( |
| 386 | clock_time_conversion<utc_clock, system_clock>{}( |
| 387 | clock_time_conversion<system_clock, _SourceClock>{}(__t))); |
| 388 | }; |
| 389 | |
| 390 | template<typename _DestClock, typename _SourceClock, typename _Duration> |
| 391 | concept __clock_convs_utc_sys |
| 392 | = requires (const time_point<_SourceClock, _Duration>& __t) { |
| 393 | clock_time_conversion<_DestClock, system_clock>{}( |
| 394 | clock_time_conversion<system_clock, utc_clock>{}( |
| 395 | clock_time_conversion<utc_clock, _SourceClock>{}(__t))); |
| 396 | }; |
| 397 | |
| 398 | } // namespace __detail |
| 399 | /// @endcond |
| 400 | |
| 401 | /// Convert a time point to a different clock. |
| 402 | template<typename _DestClock, typename _SourceClock, typename _Duration> |
| 403 | [[nodiscard]] |
| 404 | inline auto |
| 405 | clock_cast(const time_point<_SourceClock, _Duration>& __t) |
| 406 | requires __detail::__clock_convs<_DestClock, _SourceClock, _Duration> |
| 407 | || __detail::__clock_convs_sys<_DestClock, _SourceClock, _Duration> |
| 408 | || __detail::__clock_convs_utc<_DestClock, _SourceClock, _Duration> |
| 409 | || __detail::__clock_convs_sys_utc<_DestClock, _SourceClock, _Duration> |
| 410 | || __detail::__clock_convs_utc_sys<_DestClock, _SourceClock, _Duration> |
| 411 | { |
| 412 | constexpr bool __direct |
| 413 | = __detail::__clock_convs<_DestClock, _SourceClock, _Duration>; |
| 414 | if constexpr (__direct) |
| 415 | { |
| 416 | return clock_time_conversion<_DestClock, _SourceClock>{}(__t); |
| 417 | } |
| 418 | else |
| 419 | { |
| 420 | constexpr bool __convert_via_sys_clock |
| 421 | = __detail::__clock_convs_sys<_DestClock, _SourceClock, _Duration>; |
| 422 | constexpr bool __convert_via_utc_clock |
| 423 | = __detail::__clock_convs_utc<_DestClock, _SourceClock, _Duration>; |
| 424 | if constexpr (__convert_via_sys_clock) |
| 425 | { |
| 426 | static_assert(!__convert_via_utc_clock, |
| 427 | "clock_cast requires a unique best conversion, but " |
| 428 | "conversion is possible via system_clock and also via" |
| 429 | "utc_clock"); |
| 430 | return clock_time_conversion<_DestClock, system_clock>{}( |
| 431 | clock_time_conversion<system_clock, _SourceClock>{}(__t)); |
| 432 | } |
| 433 | else if constexpr (__convert_via_utc_clock) |
| 434 | { |
| 435 | return clock_time_conversion<_DestClock, utc_clock>{}( |
| 436 | clock_time_conversion<utc_clock, _SourceClock>{}(__t)); |
| 437 | } |
| 438 | else |
| 439 | { |
| 440 | constexpr bool __convert_via_sys_and_utc_clocks |
| 441 | = __detail::__clock_convs_sys_utc<_DestClock, |
| 442 | _SourceClock, |
| 443 | _Duration>; |
| 444 | |
| 445 | if constexpr (__convert_via_sys_and_utc_clocks) |
| 446 | { |
| 447 | constexpr bool __convert_via_utc_and_sys_clocks |
| 448 | = __detail::__clock_convs_utc_sys<_DestClock, |
| 449 | _SourceClock, |
| 450 | _Duration>; |
| 451 | static_assert(!__convert_via_utc_and_sys_clocks, |
| 452 | "clock_cast requires a unique best conversion, but " |
| 453 | "conversion is possible via system_clock followed by " |
| 454 | "utc_clock, and also via utc_clock followed by " |
| 455 | "system_clock"); |
| 456 | return clock_time_conversion<_DestClock, utc_clock>{}( |
| 457 | clock_time_conversion<utc_clock, system_clock>{}( |
| 458 | clock_time_conversion<system_clock, _SourceClock>{}(__t))); |
| 459 | } |
| 460 | else |
| 461 | { |
| 462 | return clock_time_conversion<_DestClock, system_clock>{}( |
| 463 | clock_time_conversion<system_clock, utc_clock>{}( |
| 464 | clock_time_conversion<utc_clock, _SourceClock>{}(__t))); |
| 465 | } |
| 466 | } |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | // CALENDRICAL TYPES |
| 471 | |
| 472 | // CLASS DECLARATIONS |
| 473 | class day; |
| 474 | class month; |
| 475 | class year; |
| 476 | class weekday; |
| 477 | class weekday_indexed; |
| 478 | class weekday_last; |
| 479 | class month_day; |
| 480 | class month_day_last; |
| 481 | class month_weekday; |
| 482 | class month_weekday_last; |
| 483 | class year_month; |
| 484 | class year_month_day; |
| 485 | class year_month_day_last; |
| 486 | class year_month_weekday; |
| 487 | class year_month_weekday_last; |
| 488 | |
| 489 | struct last_spec |
| 490 | { |
| 491 | explicit last_spec() = default; |
| 492 | |
| 493 | friend constexpr month_day_last |
| 494 | operator/(int __m, last_spec) noexcept; |
| 495 | |
| 496 | friend constexpr month_day_last |
| 497 | operator/(last_spec, int __m) noexcept; |
| 498 | }; |
| 499 | |
| 500 | inline constexpr last_spec last{}; |
| 501 | |
| 502 | namespace __detail |
| 503 | { |
| 504 | // Helper to __add_modulo and __sub_modulo. |
| 505 | template <unsigned __d, typename _Tp> |
| 506 | consteval auto |
| 507 | __modulo_offset() |
| 508 | { |
| 509 | using _Up = make_unsigned_t<_Tp>; |
| 510 | auto constexpr __a = _Up(-1) - _Up(255 + __d - 2); |
| 511 | auto constexpr __b = _Up(__d * (__a / __d) - 1); |
| 512 | // Notice: b <= a - 1 <= _Up(-1) - (255 + d - 1) and b % d = d - 1. |
| 513 | return _Up(-1) - __b; // >= 255 + d - 1 |
| 514 | } |
| 515 | |
| 516 | // Compute the remainder of the Euclidean division of __x + __y divided by |
| 517 | // __d without overflowing. Typically, __x <= 255 + d - 1 is sum of |
| 518 | // weekday/month with a shift in [0, d - 1] and __y is a duration count. |
| 519 | template <unsigned __d, typename _Tp> |
| 520 | constexpr unsigned |
| 521 | __add_modulo(unsigned __x, _Tp __y) |
| 522 | { |
| 523 | using _Up = make_unsigned_t<_Tp>; |
| 524 | // For __y >= 0, _Up(__y) has the same mathematical value as __y and |
| 525 | // this function simply returns (__x + _Up(__y)) % d. Typically, this |
| 526 | // doesn't overflow since the range of _Up contains many more positive |
| 527 | // values than _Tp's. For __y < 0, _Up(__y) has a mathematical value in |
| 528 | // the upper-half range of _Up so that adding a positive value to it |
| 529 | // might overflow. Moreover, most likely, _Up(__y) != __y mod d. To |
| 530 | // fix both issues we subtract from _Up(__y) an __offset >= |
| 531 | // 255 + d - 1 to make room for the addition to __x and shift the modulo |
| 532 | // to the correct value. |
| 533 | auto const __offset = __y >= 0 ? _Up(0) : __modulo_offset<__d, _Tp>(); |
| 534 | return (__x + _Up(__y) - __offset) % __d; |
| 535 | } |
| 536 | |
| 537 | // Similar to __add_modulo but for __x - __y. |
| 538 | template <unsigned __d, typename _Tp> |
| 539 | constexpr unsigned |
| 540 | __sub_modulo(unsigned __x, _Tp __y) |
| 541 | { |
| 542 | using _Up = make_unsigned_t<_Tp>; |
| 543 | auto const __offset = __y <= 0 ? _Up(0) : __modulo_offset<__d, _Tp>(); |
| 544 | return (__x - _Up(__y) - __offset) % __d; |
| 545 | } |
| 546 | |
| 547 | inline constexpr unsigned __days_per_month[12] |
| 548 | = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; |
| 549 | } |
| 550 | |
| 551 | // DAY |
| 552 | |
| 553 | class day |
| 554 | { |
| 555 | private: |
| 556 | unsigned char _M_d; |
| 557 | |
| 558 | public: |
| 559 | day() = default; |
| 560 | |
| 561 | explicit constexpr |
| 562 | day(unsigned __d) noexcept |
| 563 | : _M_d(__d) |
| 564 | { } |
| 565 | |
| 566 | constexpr day& |
| 567 | operator++() noexcept |
| 568 | { |
| 569 | ++_M_d; |
| 570 | return *this; |
| 571 | } |
| 572 | |
| 573 | constexpr day |
| 574 | operator++(int) noexcept |
| 575 | { |
| 576 | auto __ret = *this; |
| 577 | ++(*this); |
| 578 | return __ret; |
| 579 | } |
| 580 | |
| 581 | constexpr day& |
| 582 | operator--() noexcept |
| 583 | { |
| 584 | --_M_d; |
| 585 | return *this; |
| 586 | } |
| 587 | |
| 588 | constexpr day |
| 589 | operator--(int) noexcept |
| 590 | { |
| 591 | auto __ret = *this; |
| 592 | --(*this); |
| 593 | return __ret; |
| 594 | } |
| 595 | |
| 596 | constexpr day& |
| 597 | operator+=(const days& __d) noexcept |
| 598 | { |
| 599 | *this = *this + __d; |
| 600 | return *this; |
| 601 | } |
| 602 | |
| 603 | constexpr day& |
| 604 | operator-=(const days& __d) noexcept |
| 605 | { |
| 606 | *this = *this - __d; |
| 607 | return *this; |
| 608 | } |
| 609 | |
| 610 | constexpr explicit |
| 611 | operator unsigned() const noexcept |
| 612 | { return _M_d; } |
| 613 | |
| 614 | constexpr bool |
| 615 | ok() const noexcept |
| 616 | { return 1 <= _M_d && _M_d <= 31; } |
| 617 | |
| 618 | friend constexpr bool |
| 619 | operator==(const day& __x, const day& __y) noexcept |
| 620 | { return unsigned{__x} == unsigned{__y}; } |
| 621 | |
| 622 | friend constexpr strong_ordering |
| 623 | operator<=>(const day& __x, const day& __y) noexcept |
| 624 | { return unsigned{__x} <=> unsigned{__y}; } |
| 625 | |
| 626 | friend constexpr day |
| 627 | operator+(const day& __x, const days& __y) noexcept |
| 628 | { return day(unsigned{__x} + __y.count()); } |
| 629 | |
| 630 | friend constexpr day |
| 631 | operator+(const days& __x, const day& __y) noexcept |
| 632 | { return __y + __x; } |
| 633 | |
| 634 | friend constexpr day |
| 635 | operator-(const day& __x, const days& __y) noexcept |
| 636 | { return __x + -__y; } |
| 637 | |
| 638 | friend constexpr days |
| 639 | operator-(const day& __x, const day& __y) noexcept |
| 640 | { return days{int(unsigned{__x}) - int(unsigned{__y})}; } |
| 641 | |
| 642 | friend constexpr month_day |
| 643 | operator/(const month& __m, const day& __d) noexcept; |
| 644 | |
| 645 | friend constexpr month_day |
| 646 | operator/(int __m, const day& __d) noexcept; |
| 647 | |
| 648 | friend constexpr month_day |
| 649 | operator/(const day& __d, const month& __m) noexcept; |
| 650 | |
| 651 | friend constexpr month_day |
| 652 | operator/(const day& __d, int __m) noexcept; |
| 653 | |
| 654 | friend constexpr year_month_day |
| 655 | operator/(const year_month& __ym, const day& __d) noexcept; |
| 656 | }; |
| 657 | |
| 658 | // MONTH |
| 659 | |
| 660 | class month |
| 661 | { |
| 662 | private: |
| 663 | unsigned char _M_m; |
| 664 | |
| 665 | public: |
| 666 | month() = default; |
| 667 | |
| 668 | explicit constexpr |
| 669 | month(unsigned __m) noexcept |
| 670 | : _M_m(__m) |
| 671 | { } |
| 672 | |
| 673 | constexpr month& |
| 674 | operator++() noexcept |
| 675 | { |
| 676 | *this += months{1}; |
| 677 | return *this; |
| 678 | } |
| 679 | |
| 680 | constexpr month |
| 681 | operator++(int) noexcept |
| 682 | { |
| 683 | auto __ret = *this; |
| 684 | ++(*this); |
| 685 | return __ret; |
| 686 | } |
| 687 | |
| 688 | constexpr month& |
| 689 | operator--() noexcept |
| 690 | { |
| 691 | *this -= months{1}; |
| 692 | return *this; |
| 693 | } |
| 694 | |
| 695 | constexpr month |
| 696 | operator--(int) noexcept |
| 697 | { |
| 698 | auto __ret = *this; |
| 699 | --(*this); |
| 700 | return __ret; |
| 701 | } |
| 702 | |
| 703 | constexpr month& |
| 704 | operator+=(const months& __m) noexcept |
| 705 | { |
| 706 | *this = *this + __m; |
| 707 | return *this; |
| 708 | } |
| 709 | |
| 710 | constexpr month& |
| 711 | operator-=(const months& __m) noexcept |
| 712 | { |
| 713 | *this = *this - __m; |
| 714 | return *this; |
| 715 | } |
| 716 | |
| 717 | explicit constexpr |
| 718 | operator unsigned() const noexcept |
| 719 | { return _M_m; } |
| 720 | |
| 721 | constexpr bool |
| 722 | ok() const noexcept |
| 723 | { return 1 <= _M_m && _M_m <= 12; } |
| 724 | |
| 725 | friend constexpr bool |
| 726 | operator==(const month& __x, const month& __y) noexcept |
| 727 | { return unsigned{__x} == unsigned{__y}; } |
| 728 | |
| 729 | friend constexpr strong_ordering |
| 730 | operator<=>(const month& __x, const month& __y) noexcept |
| 731 | { return unsigned{__x} <=> unsigned{__y}; } |
| 732 | |
| 733 | friend constexpr month |
| 734 | operator+(const month& __x, const months& __y) noexcept |
| 735 | { |
| 736 | // modulo(x + (y - 1), 12) = modulo(x + (y - 1) + 12, 12) |
| 737 | // = modulo((x + 11) + y , 12) |
| 738 | return month{1 + __detail::__add_modulo<12>( |
| 739 | x: unsigned{__x} + 11, y: __y.count())}; |
| 740 | } |
| 741 | |
| 742 | friend constexpr month |
| 743 | operator+(const months& __x, const month& __y) noexcept |
| 744 | { return __y + __x; } |
| 745 | |
| 746 | friend constexpr month |
| 747 | operator-(const month& __x, const months& __y) noexcept |
| 748 | { |
| 749 | // modulo(x + (-y - 1), 12) = modulo(x + (-y - 1) + 12, 12) |
| 750 | // = modulo((x + 11) - y , 12) |
| 751 | return month{1 + __detail::__sub_modulo<12>( |
| 752 | x: unsigned{__x} + 11, y: __y.count())}; |
| 753 | } |
| 754 | |
| 755 | friend constexpr months |
| 756 | operator-(const month& __x, const month& __y) noexcept |
| 757 | { |
| 758 | const auto __dm = int(unsigned(__x)) - int(unsigned(__y)); |
| 759 | return months{__dm < 0 ? 12 + __dm : __dm}; |
| 760 | } |
| 761 | |
| 762 | friend constexpr year_month |
| 763 | operator/(const year& __y, const month& __m) noexcept; |
| 764 | |
| 765 | friend constexpr month_day |
| 766 | operator/(const month& __m, int __d) noexcept; |
| 767 | |
| 768 | friend constexpr month_day_last |
| 769 | operator/(const month& __m, last_spec) noexcept; |
| 770 | |
| 771 | friend constexpr month_day_last |
| 772 | operator/(last_spec, const month& __m) noexcept; |
| 773 | |
| 774 | friend constexpr month_weekday |
| 775 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; |
| 776 | |
| 777 | friend constexpr month_weekday |
| 778 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; |
| 779 | |
| 780 | friend constexpr month_weekday_last |
| 781 | operator/(const month& __m, const weekday_last& __wdl) noexcept; |
| 782 | |
| 783 | friend constexpr month_weekday_last |
| 784 | operator/(const weekday_last& __wdl, const month& __m) noexcept; |
| 785 | }; |
| 786 | |
| 787 | inline constexpr month January{1}; |
| 788 | inline constexpr month February{2}; |
| 789 | inline constexpr month March{3}; |
| 790 | inline constexpr month April{4}; |
| 791 | inline constexpr month May{5}; |
| 792 | inline constexpr month June{6}; |
| 793 | inline constexpr month July{7}; |
| 794 | inline constexpr month August{8}; |
| 795 | inline constexpr month September{9}; |
| 796 | inline constexpr month October{10}; |
| 797 | inline constexpr month November{11}; |
| 798 | inline constexpr month December{12}; |
| 799 | |
| 800 | // YEAR |
| 801 | |
| 802 | class year |
| 803 | { |
| 804 | private: |
| 805 | short _M_y; |
| 806 | |
| 807 | public: |
| 808 | year() = default; |
| 809 | |
| 810 | explicit constexpr |
| 811 | year(int __y) noexcept |
| 812 | : _M_y{static_cast<short>(__y)} |
| 813 | { } |
| 814 | |
| 815 | static constexpr year |
| 816 | min() noexcept |
| 817 | { return year{-32767}; } |
| 818 | |
| 819 | static constexpr year |
| 820 | max() noexcept |
| 821 | { return year{32767}; } |
| 822 | |
| 823 | constexpr year& |
| 824 | operator++() noexcept |
| 825 | { |
| 826 | ++_M_y; |
| 827 | return *this; |
| 828 | } |
| 829 | |
| 830 | constexpr year |
| 831 | operator++(int) noexcept |
| 832 | { |
| 833 | auto __ret = *this; |
| 834 | ++(*this); |
| 835 | return __ret; |
| 836 | } |
| 837 | |
| 838 | constexpr year& |
| 839 | operator--() noexcept |
| 840 | { |
| 841 | --_M_y; |
| 842 | return *this; |
| 843 | } |
| 844 | |
| 845 | constexpr year |
| 846 | operator--(int) noexcept |
| 847 | { |
| 848 | auto __ret = *this; |
| 849 | --(*this); |
| 850 | return __ret; |
| 851 | } |
| 852 | |
| 853 | constexpr year& |
| 854 | operator+=(const years& __y) noexcept |
| 855 | { |
| 856 | *this = *this + __y; |
| 857 | return *this; |
| 858 | } |
| 859 | |
| 860 | constexpr year& |
| 861 | operator-=(const years& __y) noexcept |
| 862 | { |
| 863 | *this = *this - __y; |
| 864 | return *this; |
| 865 | } |
| 866 | |
| 867 | constexpr year |
| 868 | operator+() const noexcept |
| 869 | { return *this; } |
| 870 | |
| 871 | constexpr year |
| 872 | operator-() const noexcept |
| 873 | { return year{-_M_y}; } |
| 874 | |
| 875 | constexpr bool |
| 876 | is_leap() const noexcept |
| 877 | { |
| 878 | // Testing divisibility by 100 first gives better performance [1], i.e., |
| 879 | // return _M_y % 100 == 0 ? _M_y % 400 == 0 : _M_y % 16 == 0; |
| 880 | // Furthermore, if _M_y % 100 == 0, then _M_y % 400 == 0 is equivalent |
| 881 | // to _M_y % 16 == 0, so we can simplify it to |
| 882 | // return _M_y % 100 == 0 ? _M_y % 16 == 0 : _M_y % 4 == 0. // #1 |
| 883 | // Similarly, we can replace 100 with 25 (which is good since |
| 884 | // _M_y % 25 == 0 requires one fewer instruction than _M_y % 100 == 0 |
| 885 | // [2]): |
| 886 | // return _M_y % 25 == 0 ? _M_y % 16 == 0 : _M_y % 4 == 0. // #2 |
| 887 | // Indeed, first assume _M_y % 4 != 0. Then _M_y % 16 != 0 and hence, |
| 888 | // _M_y % 4 == 0 and _M_y % 16 == 0 are both false. Therefore, #2 |
| 889 | // returns false as it should (regardless of _M_y % 25.) Now assume |
| 890 | // _M_y % 4 == 0. In this case, _M_y % 25 == 0 if, and only if, |
| 891 | // _M_y % 100 == 0, that is, #1 and #2 are equivalent. Finally, #2 is |
| 892 | // equivalent to |
| 893 | // return (_M_y & (_M_y % 25 == 0 ? 15 : 3)) == 0. |
| 894 | |
| 895 | // References: |
| 896 | // [1] https://github.com/cassioneri/calendar |
| 897 | // [2] https://godbolt.org/z/55G8rn77e |
| 898 | // [3] https://gcc.gnu.org/pipermail/libstdc++/2021-June/052815.html |
| 899 | |
| 900 | return (_M_y & (_M_y % 25 == 0 ? 15 : 3)) == 0; |
| 901 | } |
| 902 | |
| 903 | explicit constexpr |
| 904 | operator int() const noexcept |
| 905 | { return _M_y; } |
| 906 | |
| 907 | constexpr bool |
| 908 | ok() const noexcept |
| 909 | { return min()._M_y <= _M_y && _M_y <= max()._M_y; } |
| 910 | |
| 911 | friend constexpr bool |
| 912 | operator==(const year& __x, const year& __y) noexcept |
| 913 | { return int{__x} == int{__y}; } |
| 914 | |
| 915 | friend constexpr strong_ordering |
| 916 | operator<=>(const year& __x, const year& __y) noexcept |
| 917 | { return int{__x} <=> int{__y}; } |
| 918 | |
| 919 | friend constexpr year |
| 920 | operator+(const year& __x, const years& __y) noexcept |
| 921 | { return year{int{__x} + static_cast<int>(__y.count())}; } |
| 922 | |
| 923 | friend constexpr year |
| 924 | operator+(const years& __x, const year& __y) noexcept |
| 925 | { return __y + __x; } |
| 926 | |
| 927 | friend constexpr year |
| 928 | operator-(const year& __x, const years& __y) noexcept |
| 929 | { return __x + -__y; } |
| 930 | |
| 931 | friend constexpr years |
| 932 | operator-(const year& __x, const year& __y) noexcept |
| 933 | { return years{int{__x} - int{__y}}; } |
| 934 | |
| 935 | friend constexpr year_month |
| 936 | operator/(const year& __y, int __m) noexcept; |
| 937 | |
| 938 | friend constexpr year_month_day |
| 939 | operator/(const year& __y, const month_day& __md) noexcept; |
| 940 | |
| 941 | friend constexpr year_month_day |
| 942 | operator/(const month_day& __md, const year& __y) noexcept; |
| 943 | |
| 944 | friend constexpr year_month_day_last |
| 945 | operator/(const year& __y, const month_day_last& __mdl) noexcept; |
| 946 | |
| 947 | friend constexpr year_month_day_last |
| 948 | operator/(const month_day_last& __mdl, const year& __y) noexcept; |
| 949 | |
| 950 | friend constexpr year_month_weekday |
| 951 | operator/(const year& __y, const month_weekday& __mwd) noexcept; |
| 952 | |
| 953 | friend constexpr year_month_weekday |
| 954 | operator/(const month_weekday& __mwd, const year& __y) noexcept; |
| 955 | |
| 956 | friend constexpr year_month_weekday_last |
| 957 | operator/(const year& __y, const month_weekday_last& __mwdl) noexcept; |
| 958 | |
| 959 | friend constexpr year_month_weekday_last |
| 960 | operator/(const month_weekday_last& __mwdl, const year& __y) noexcept; |
| 961 | }; |
| 962 | |
| 963 | // WEEKDAY |
| 964 | |
| 965 | class weekday |
| 966 | { |
| 967 | private: |
| 968 | unsigned char _M_wd; |
| 969 | |
| 970 | static constexpr weekday |
| 971 | _S_from_days(const days& __d) |
| 972 | { |
| 973 | return weekday{__detail::__add_modulo<7>(x: 4, y: __d.count())}; |
| 974 | } |
| 975 | |
| 976 | public: |
| 977 | weekday() = default; |
| 978 | |
| 979 | explicit constexpr |
| 980 | weekday(unsigned __wd) noexcept |
| 981 | : _M_wd(__wd == 7 ? 0 : __wd) // __wd % 7 ? |
| 982 | { } |
| 983 | |
| 984 | constexpr |
| 985 | weekday(const sys_days& __dp) noexcept |
| 986 | : weekday{_S_from_days(d: __dp.time_since_epoch())} |
| 987 | { } |
| 988 | |
| 989 | explicit constexpr |
| 990 | weekday(const local_days& __dp) noexcept |
| 991 | : weekday{sys_days{__dp.time_since_epoch()}} |
| 992 | { } |
| 993 | |
| 994 | constexpr weekday& |
| 995 | operator++() noexcept |
| 996 | { |
| 997 | *this += days{1}; |
| 998 | return *this; |
| 999 | } |
| 1000 | |
| 1001 | constexpr weekday |
| 1002 | operator++(int) noexcept |
| 1003 | { |
| 1004 | auto __ret = *this; |
| 1005 | ++(*this); |
| 1006 | return __ret; |
| 1007 | } |
| 1008 | |
| 1009 | constexpr weekday& |
| 1010 | operator--() noexcept |
| 1011 | { |
| 1012 | *this -= days{1}; |
| 1013 | return *this; |
| 1014 | } |
| 1015 | |
| 1016 | constexpr weekday |
| 1017 | operator--(int) noexcept |
| 1018 | { |
| 1019 | auto __ret = *this; |
| 1020 | --(*this); |
| 1021 | return __ret; |
| 1022 | } |
| 1023 | |
| 1024 | constexpr weekday& |
| 1025 | operator+=(const days& __d) noexcept |
| 1026 | { |
| 1027 | *this = *this + __d; |
| 1028 | return *this; |
| 1029 | } |
| 1030 | |
| 1031 | constexpr weekday& |
| 1032 | operator-=(const days& __d) noexcept |
| 1033 | { |
| 1034 | *this = *this - __d; |
| 1035 | return *this; |
| 1036 | } |
| 1037 | |
| 1038 | constexpr unsigned |
| 1039 | c_encoding() const noexcept |
| 1040 | { return _M_wd; } |
| 1041 | |
| 1042 | constexpr unsigned |
| 1043 | iso_encoding() const noexcept |
| 1044 | { return _M_wd == 0u ? 7u : _M_wd; } |
| 1045 | |
| 1046 | constexpr bool |
| 1047 | ok() const noexcept |
| 1048 | { return _M_wd <= 6; } |
| 1049 | |
| 1050 | constexpr weekday_indexed |
| 1051 | operator[](unsigned __index) const noexcept; |
| 1052 | |
| 1053 | constexpr weekday_last |
| 1054 | operator[](last_spec) const noexcept; |
| 1055 | |
| 1056 | friend constexpr bool |
| 1057 | operator==(const weekday& __x, const weekday& __y) noexcept |
| 1058 | { return __x._M_wd == __y._M_wd; } |
| 1059 | |
| 1060 | friend constexpr weekday |
| 1061 | operator+(const weekday& __x, const days& __y) noexcept |
| 1062 | { |
| 1063 | return weekday{__detail::__add_modulo<7>(x: __x._M_wd, y: __y.count())}; |
| 1064 | } |
| 1065 | |
| 1066 | friend constexpr weekday |
| 1067 | operator+(const days& __x, const weekday& __y) noexcept |
| 1068 | { return __y + __x; } |
| 1069 | |
| 1070 | friend constexpr weekday |
| 1071 | operator-(const weekday& __x, const days& __y) noexcept |
| 1072 | { |
| 1073 | return weekday{__detail::__sub_modulo<7>(x: __x._M_wd, y: __y.count())}; |
| 1074 | } |
| 1075 | |
| 1076 | friend constexpr days |
| 1077 | operator-(const weekday& __x, const weekday& __y) noexcept |
| 1078 | { |
| 1079 | const auto __n = __x.c_encoding() - __y.c_encoding(); |
| 1080 | return static_cast<int>(__n) >= 0 ? days{__n} : days{__n + 7}; |
| 1081 | } |
| 1082 | }; |
| 1083 | |
| 1084 | inline constexpr weekday Sunday{0}; |
| 1085 | inline constexpr weekday Monday{1}; |
| 1086 | inline constexpr weekday Tuesday{2}; |
| 1087 | inline constexpr weekday Wednesday{3}; |
| 1088 | inline constexpr weekday Thursday{4}; |
| 1089 | inline constexpr weekday Friday{5}; |
| 1090 | inline constexpr weekday Saturday{6}; |
| 1091 | |
| 1092 | // WEEKDAY_INDEXED |
| 1093 | |
| 1094 | class weekday_indexed |
| 1095 | { |
| 1096 | private: |
| 1097 | chrono::weekday _M_wd; |
| 1098 | unsigned char _M_index; |
| 1099 | |
| 1100 | public: |
| 1101 | weekday_indexed() = default; |
| 1102 | |
| 1103 | constexpr |
| 1104 | weekday_indexed(const chrono::weekday& __wd, unsigned __index) noexcept |
| 1105 | : _M_wd(__wd), _M_index(__index) |
| 1106 | { } |
| 1107 | |
| 1108 | constexpr chrono::weekday |
| 1109 | weekday() const noexcept |
| 1110 | { return _M_wd; } |
| 1111 | |
| 1112 | constexpr unsigned |
| 1113 | index() const noexcept |
| 1114 | { return _M_index; }; |
| 1115 | |
| 1116 | constexpr bool |
| 1117 | ok() const noexcept |
| 1118 | { return _M_wd.ok() && 1 <= _M_index && _M_index <= 5; } |
| 1119 | |
| 1120 | friend constexpr bool |
| 1121 | operator==(const weekday_indexed& __x, const weekday_indexed& __y) noexcept |
| 1122 | { return __x.weekday() == __y.weekday() && __x.index() == __y.index(); } |
| 1123 | |
| 1124 | friend constexpr month_weekday |
| 1125 | operator/(const month& __m, const weekday_indexed& __wdi) noexcept; |
| 1126 | |
| 1127 | friend constexpr month_weekday |
| 1128 | operator/(int __m, const weekday_indexed& __wdi) noexcept; |
| 1129 | |
| 1130 | friend constexpr month_weekday |
| 1131 | operator/(const weekday_indexed& __wdi, const month& __m) noexcept; |
| 1132 | |
| 1133 | friend constexpr month_weekday |
| 1134 | operator/(const weekday_indexed& __wdi, int __m) noexcept; |
| 1135 | |
| 1136 | friend constexpr year_month_weekday |
| 1137 | operator/(const year_month& __ym, const weekday_indexed& __wdi) noexcept; |
| 1138 | }; |
| 1139 | |
| 1140 | constexpr weekday_indexed |
| 1141 | weekday::operator[](unsigned __index) const noexcept |
| 1142 | { return {*this, __index}; } |
| 1143 | |
| 1144 | // WEEKDAY_LAST |
| 1145 | |
| 1146 | class weekday_last |
| 1147 | { |
| 1148 | private: |
| 1149 | chrono::weekday _M_wd; |
| 1150 | |
| 1151 | public: |
| 1152 | explicit constexpr |
| 1153 | weekday_last(const chrono::weekday& __wd) noexcept |
| 1154 | : _M_wd{__wd} |
| 1155 | { } |
| 1156 | |
| 1157 | constexpr chrono::weekday |
| 1158 | weekday() const noexcept |
| 1159 | { return _M_wd; } |
| 1160 | |
| 1161 | constexpr bool |
| 1162 | ok() const noexcept |
| 1163 | { return _M_wd.ok(); } |
| 1164 | |
| 1165 | friend constexpr bool |
| 1166 | operator==(const weekday_last& __x, const weekday_last& __y) noexcept |
| 1167 | { return __x.weekday() == __y.weekday(); } |
| 1168 | |
| 1169 | friend constexpr month_weekday_last |
| 1170 | operator/(int __m, const weekday_last& __wdl) noexcept; |
| 1171 | |
| 1172 | friend constexpr month_weekday_last |
| 1173 | operator/(const weekday_last& __wdl, int __m) noexcept; |
| 1174 | |
| 1175 | friend constexpr year_month_weekday_last |
| 1176 | operator/(const year_month& __ym, const weekday_last& __wdl) noexcept; |
| 1177 | }; |
| 1178 | |
| 1179 | constexpr weekday_last |
| 1180 | weekday::operator[](last_spec) const noexcept |
| 1181 | { return weekday_last{*this}; } |
| 1182 | |
| 1183 | // MONTH_DAY |
| 1184 | |
| 1185 | class month_day |
| 1186 | { |
| 1187 | private: |
| 1188 | chrono::month _M_m; |
| 1189 | chrono::day _M_d; |
| 1190 | |
| 1191 | public: |
| 1192 | month_day() = default; |
| 1193 | |
| 1194 | constexpr |
| 1195 | month_day(const chrono::month& __m, const chrono::day& __d) noexcept |
| 1196 | : _M_m{__m}, _M_d{__d} |
| 1197 | { } |
| 1198 | |
| 1199 | constexpr chrono::month |
| 1200 | month() const noexcept |
| 1201 | { return _M_m; } |
| 1202 | |
| 1203 | constexpr chrono::day |
| 1204 | day() const noexcept |
| 1205 | { return _M_d; } |
| 1206 | |
| 1207 | constexpr bool |
| 1208 | ok() const noexcept |
| 1209 | { |
| 1210 | return _M_m.ok() |
| 1211 | && 1u <= unsigned(_M_d) |
| 1212 | && unsigned(_M_d) <= __detail::__days_per_month[unsigned(_M_m) - 1]; |
| 1213 | } |
| 1214 | |
| 1215 | friend constexpr bool |
| 1216 | operator==(const month_day& __x, const month_day& __y) noexcept |
| 1217 | { return __x.month() == __y.month() && __x.day() == __y.day(); } |
| 1218 | |
| 1219 | friend constexpr strong_ordering |
| 1220 | operator<=>(const month_day& __x, const month_day& __y) noexcept |
| 1221 | = default; |
| 1222 | |
| 1223 | friend constexpr month_day |
| 1224 | operator/(const chrono::month& __m, const chrono::day& __d) noexcept |
| 1225 | { return {__m, __d}; } |
| 1226 | |
| 1227 | friend constexpr month_day |
| 1228 | operator/(const chrono::month& __m, int __d) noexcept |
| 1229 | { return {__m, chrono::day(unsigned(__d))}; } |
| 1230 | |
| 1231 | friend constexpr month_day |
| 1232 | operator/(int __m, const chrono::day& __d) noexcept |
| 1233 | { return {chrono::month(unsigned(__m)), __d}; } |
| 1234 | |
| 1235 | friend constexpr month_day |
| 1236 | operator/(const chrono::day& __d, const chrono::month& __m) noexcept |
| 1237 | { return {__m, __d}; } |
| 1238 | |
| 1239 | friend constexpr month_day |
| 1240 | operator/(const chrono::day& __d, int __m) noexcept |
| 1241 | { return {chrono::month(unsigned(__m)), __d}; } |
| 1242 | |
| 1243 | friend constexpr year_month_day |
| 1244 | operator/(int __y, const month_day& __md) noexcept; |
| 1245 | |
| 1246 | friend constexpr year_month_day |
| 1247 | operator/(const month_day& __md, int __y) noexcept; |
| 1248 | }; |
| 1249 | |
| 1250 | // MONTH_DAY_LAST |
| 1251 | |
| 1252 | class month_day_last |
| 1253 | { |
| 1254 | private: |
| 1255 | chrono::month _M_m; |
| 1256 | |
| 1257 | public: |
| 1258 | explicit constexpr |
| 1259 | month_day_last(const chrono::month& __m) noexcept |
| 1260 | : _M_m{__m} |
| 1261 | { } |
| 1262 | |
| 1263 | constexpr chrono::month |
| 1264 | month() const noexcept |
| 1265 | { return _M_m; } |
| 1266 | |
| 1267 | constexpr bool |
| 1268 | ok() const noexcept |
| 1269 | { return _M_m.ok(); } |
| 1270 | |
| 1271 | friend constexpr bool |
| 1272 | operator==(const month_day_last& __x, const month_day_last& __y) noexcept |
| 1273 | { return __x.month() == __y.month(); } |
| 1274 | |
| 1275 | friend constexpr strong_ordering |
| 1276 | operator<=>(const month_day_last& __x, const month_day_last& __y) noexcept |
| 1277 | = default; |
| 1278 | |
| 1279 | friend constexpr month_day_last |
| 1280 | operator/(const chrono::month& __m, last_spec) noexcept |
| 1281 | { return month_day_last{__m}; } |
| 1282 | |
| 1283 | friend constexpr month_day_last |
| 1284 | operator/(int __m, last_spec) noexcept |
| 1285 | { return chrono::month(unsigned(__m)) / last; } |
| 1286 | |
| 1287 | friend constexpr month_day_last |
| 1288 | operator/(last_spec, const chrono::month& __m) noexcept |
| 1289 | { return __m / last; } |
| 1290 | |
| 1291 | friend constexpr month_day_last |
| 1292 | operator/(last_spec, int __m) noexcept |
| 1293 | { return __m / last; } |
| 1294 | |
| 1295 | friend constexpr year_month_day_last |
| 1296 | operator/(int __y, const month_day_last& __mdl) noexcept; |
| 1297 | |
| 1298 | friend constexpr year_month_day_last |
| 1299 | operator/(const month_day_last& __mdl, int __y) noexcept; |
| 1300 | }; |
| 1301 | |
| 1302 | // MONTH_WEEKDAY |
| 1303 | |
| 1304 | class month_weekday |
| 1305 | { |
| 1306 | private: |
| 1307 | chrono::month _M_m; |
| 1308 | chrono::weekday_indexed _M_wdi; |
| 1309 | |
| 1310 | public: |
| 1311 | constexpr |
| 1312 | month_weekday(const chrono::month& __m, |
| 1313 | const chrono::weekday_indexed& __wdi) noexcept |
| 1314 | : _M_m{__m}, _M_wdi{__wdi} |
| 1315 | { } |
| 1316 | |
| 1317 | constexpr chrono::month |
| 1318 | month() const noexcept |
| 1319 | { return _M_m; } |
| 1320 | |
| 1321 | constexpr chrono::weekday_indexed |
| 1322 | weekday_indexed() const noexcept |
| 1323 | { return _M_wdi; } |
| 1324 | |
| 1325 | constexpr bool |
| 1326 | ok() const noexcept |
| 1327 | { return _M_m.ok() && _M_wdi.ok(); } |
| 1328 | |
| 1329 | friend constexpr bool |
| 1330 | operator==(const month_weekday& __x, const month_weekday& __y) noexcept |
| 1331 | { |
| 1332 | return __x.month() == __y.month() |
| 1333 | && __x.weekday_indexed() == __y.weekday_indexed(); |
| 1334 | } |
| 1335 | |
| 1336 | friend constexpr month_weekday |
| 1337 | operator/(const chrono::month& __m, |
| 1338 | const chrono::weekday_indexed& __wdi) noexcept |
| 1339 | { return {__m, __wdi}; } |
| 1340 | |
| 1341 | friend constexpr month_weekday |
| 1342 | operator/(int __m, const chrono::weekday_indexed& __wdi) noexcept |
| 1343 | { return chrono::month(unsigned(__m)) / __wdi; } |
| 1344 | |
| 1345 | friend constexpr month_weekday |
| 1346 | operator/(const chrono::weekday_indexed& __wdi, |
| 1347 | const chrono::month& __m) noexcept |
| 1348 | { return __m / __wdi; } |
| 1349 | |
| 1350 | friend constexpr month_weekday |
| 1351 | operator/(const chrono::weekday_indexed& __wdi, int __m) noexcept |
| 1352 | { return __m / __wdi; } |
| 1353 | |
| 1354 | friend constexpr year_month_weekday |
| 1355 | operator/(int __y, const month_weekday& __mwd) noexcept; |
| 1356 | |
| 1357 | friend constexpr year_month_weekday |
| 1358 | operator/(const month_weekday& __mwd, int __y) noexcept; |
| 1359 | }; |
| 1360 | |
| 1361 | // MONTH_WEEKDAY_LAST |
| 1362 | |
| 1363 | class month_weekday_last |
| 1364 | { |
| 1365 | private: |
| 1366 | chrono::month _M_m; |
| 1367 | chrono::weekday_last _M_wdl; |
| 1368 | |
| 1369 | public: |
| 1370 | constexpr |
| 1371 | month_weekday_last(const chrono::month& __m, |
| 1372 | const chrono::weekday_last& __wdl) noexcept |
| 1373 | :_M_m{__m}, _M_wdl{__wdl} |
| 1374 | { } |
| 1375 | |
| 1376 | constexpr chrono::month |
| 1377 | month() const noexcept |
| 1378 | { return _M_m; } |
| 1379 | |
| 1380 | constexpr chrono::weekday_last |
| 1381 | weekday_last() const noexcept |
| 1382 | { return _M_wdl; } |
| 1383 | |
| 1384 | constexpr bool |
| 1385 | ok() const noexcept |
| 1386 | { return _M_m.ok() && _M_wdl.ok(); } |
| 1387 | |
| 1388 | friend constexpr bool |
| 1389 | operator==(const month_weekday_last& __x, |
| 1390 | const month_weekday_last& __y) noexcept |
| 1391 | { |
| 1392 | return __x.month() == __y.month() |
| 1393 | && __x.weekday_last() == __y.weekday_last(); |
| 1394 | } |
| 1395 | |
| 1396 | friend constexpr month_weekday_last |
| 1397 | operator/(const chrono::month& __m, |
| 1398 | const chrono::weekday_last& __wdl) noexcept |
| 1399 | { return {__m, __wdl}; } |
| 1400 | |
| 1401 | friend constexpr month_weekday_last |
| 1402 | operator/(int __m, const chrono::weekday_last& __wdl) noexcept |
| 1403 | { return chrono::month(unsigned(__m)) / __wdl; } |
| 1404 | |
| 1405 | friend constexpr month_weekday_last |
| 1406 | operator/(const chrono::weekday_last& __wdl, |
| 1407 | const chrono::month& __m) noexcept |
| 1408 | { return __m / __wdl; } |
| 1409 | |
| 1410 | friend constexpr month_weekday_last |
| 1411 | operator/(const chrono::weekday_last& __wdl, int __m) noexcept |
| 1412 | { return chrono::month(unsigned(__m)) / __wdl; } |
| 1413 | |
| 1414 | friend constexpr year_month_weekday_last |
| 1415 | operator/(int __y, const month_weekday_last& __mwdl) noexcept; |
| 1416 | |
| 1417 | friend constexpr year_month_weekday_last |
| 1418 | operator/(const month_weekday_last& __mwdl, int __y) noexcept; |
| 1419 | }; |
| 1420 | |
| 1421 | // YEAR_MONTH |
| 1422 | |
| 1423 | namespace __detail |
| 1424 | { |
| 1425 | // [time.cal.ym], [time.cal.ymd], etc constrain the 'months'-based |
| 1426 | // addition/subtraction operator overloads like so: |
| 1427 | // |
| 1428 | // Constraints: if the argument supplied by the caller for the months |
| 1429 | // parameter is convertible to years, its implicit conversion sequence |
| 1430 | // to years is worse than its implicit conversion sequence to months. |
| 1431 | // |
| 1432 | // We realize this constraint by templatizing the 'months'-based |
| 1433 | // overloads (using a dummy defaulted template parameter), so that |
| 1434 | // overload resolution doesn't select the 'months'-based overload unless |
| 1435 | // the implicit conversion sequence to 'months' is better than that to |
| 1436 | // 'years'. |
| 1437 | using __months_years_conversion_disambiguator = void; |
| 1438 | } |
| 1439 | |
| 1440 | class year_month |
| 1441 | { |
| 1442 | private: |
| 1443 | chrono::year _M_y; |
| 1444 | chrono::month _M_m; |
| 1445 | |
| 1446 | public: |
| 1447 | year_month() = default; |
| 1448 | |
| 1449 | constexpr |
| 1450 | year_month(const chrono::year& __y, const chrono::month& __m) noexcept |
| 1451 | : _M_y{__y}, _M_m{__m} |
| 1452 | { } |
| 1453 | |
| 1454 | constexpr chrono::year |
| 1455 | year() const noexcept |
| 1456 | { return _M_y; } |
| 1457 | |
| 1458 | constexpr chrono::month |
| 1459 | month() const noexcept |
| 1460 | { return _M_m; } |
| 1461 | |
| 1462 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1463 | constexpr year_month& |
| 1464 | operator+=(const months& __dm) noexcept |
| 1465 | { |
| 1466 | *this = *this + __dm; |
| 1467 | return *this; |
| 1468 | } |
| 1469 | |
| 1470 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1471 | constexpr year_month& |
| 1472 | operator-=(const months& __dm) noexcept |
| 1473 | { |
| 1474 | *this = *this - __dm; |
| 1475 | return *this; |
| 1476 | } |
| 1477 | |
| 1478 | constexpr year_month& |
| 1479 | operator+=(const years& __dy) noexcept |
| 1480 | { |
| 1481 | *this = *this + __dy; |
| 1482 | return *this; |
| 1483 | } |
| 1484 | |
| 1485 | constexpr year_month& |
| 1486 | operator-=(const years& __dy) noexcept |
| 1487 | { |
| 1488 | *this = *this - __dy; |
| 1489 | return *this; |
| 1490 | } |
| 1491 | |
| 1492 | constexpr bool |
| 1493 | ok() const noexcept |
| 1494 | { return _M_y.ok() && _M_m.ok(); } |
| 1495 | |
| 1496 | friend constexpr bool |
| 1497 | operator==(const year_month& __x, const year_month& __y) noexcept |
| 1498 | { return __x.year() == __y.year() && __x.month() == __y.month(); } |
| 1499 | |
| 1500 | friend constexpr strong_ordering |
| 1501 | operator<=>(const year_month& __x, const year_month& __y) noexcept |
| 1502 | = default; |
| 1503 | |
| 1504 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1505 | friend constexpr year_month |
| 1506 | operator+(const year_month& __ym, const months& __dm) noexcept |
| 1507 | { |
| 1508 | // TODO: Optimize? |
| 1509 | auto __m = __ym.month() + __dm; |
| 1510 | auto __i = int(unsigned(__ym.month())) - 1 + __dm.count(); |
| 1511 | auto __y = (__i < 0 |
| 1512 | ? __ym.year() + years{(__i - 11) / 12} |
| 1513 | : __ym.year() + years{__i / 12}); |
| 1514 | return __y / __m; |
| 1515 | } |
| 1516 | |
| 1517 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1518 | friend constexpr year_month |
| 1519 | operator+(const months& __dm, const year_month& __ym) noexcept |
| 1520 | { return __ym + __dm; } |
| 1521 | |
| 1522 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1523 | friend constexpr year_month |
| 1524 | operator-(const year_month& __ym, const months& __dm) noexcept |
| 1525 | { return __ym + -__dm; } |
| 1526 | |
| 1527 | friend constexpr months |
| 1528 | operator-(const year_month& __x, const year_month& __y) noexcept |
| 1529 | { |
| 1530 | return (__x.year() - __y.year() |
| 1531 | + months{static_cast<int>(unsigned{__x.month()}) |
| 1532 | - static_cast<int>(unsigned{__y.month()})}); |
| 1533 | } |
| 1534 | |
| 1535 | friend constexpr year_month |
| 1536 | operator+(const year_month& __ym, const years& __dy) noexcept |
| 1537 | { return (__ym.year() + __dy) / __ym.month(); } |
| 1538 | |
| 1539 | friend constexpr year_month |
| 1540 | operator+(const years& __dy, const year_month& __ym) noexcept |
| 1541 | { return __ym + __dy; } |
| 1542 | |
| 1543 | friend constexpr year_month |
| 1544 | operator-(const year_month& __ym, const years& __dy) noexcept |
| 1545 | { return __ym + -__dy; } |
| 1546 | |
| 1547 | friend constexpr year_month |
| 1548 | operator/(const chrono::year& __y, const chrono::month& __m) noexcept |
| 1549 | { return {__y, __m}; } |
| 1550 | |
| 1551 | friend constexpr year_month |
| 1552 | operator/(const chrono::year& __y, int __m) noexcept |
| 1553 | { return {__y, chrono::month(unsigned(__m))}; } |
| 1554 | |
| 1555 | friend constexpr year_month_day |
| 1556 | operator/(const year_month& __ym, int __d) noexcept; |
| 1557 | |
| 1558 | friend constexpr year_month_day_last |
| 1559 | operator/(const year_month& __ym, last_spec) noexcept; |
| 1560 | }; |
| 1561 | |
| 1562 | // YEAR_MONTH_DAY |
| 1563 | |
| 1564 | class year_month_day |
| 1565 | { |
| 1566 | private: |
| 1567 | chrono::year _M_y; |
| 1568 | chrono::month _M_m; |
| 1569 | chrono::day _M_d; |
| 1570 | |
| 1571 | static constexpr year_month_day _S_from_days(const days& __dp) noexcept; |
| 1572 | |
| 1573 | constexpr days _M_days_since_epoch() const noexcept; |
| 1574 | |
| 1575 | public: |
| 1576 | year_month_day() = default; |
| 1577 | |
| 1578 | constexpr |
| 1579 | year_month_day(const chrono::year& __y, const chrono::month& __m, |
| 1580 | const chrono::day& __d) noexcept |
| 1581 | : _M_y{__y}, _M_m{__m}, _M_d{__d} |
| 1582 | { } |
| 1583 | |
| 1584 | constexpr |
| 1585 | year_month_day(const year_month_day_last& __ymdl) noexcept; |
| 1586 | |
| 1587 | constexpr |
| 1588 | year_month_day(const sys_days& __dp) noexcept |
| 1589 | : year_month_day(_S_from_days(dp: __dp.time_since_epoch())) |
| 1590 | { } |
| 1591 | |
| 1592 | explicit constexpr |
| 1593 | year_month_day(const local_days& __dp) noexcept |
| 1594 | : year_month_day(sys_days{__dp.time_since_epoch()}) |
| 1595 | { } |
| 1596 | |
| 1597 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1598 | constexpr year_month_day& |
| 1599 | operator+=(const months& __m) noexcept |
| 1600 | { |
| 1601 | *this = *this + __m; |
| 1602 | return *this; |
| 1603 | } |
| 1604 | |
| 1605 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1606 | constexpr year_month_day& |
| 1607 | operator-=(const months& __m) noexcept |
| 1608 | { |
| 1609 | *this = *this - __m; |
| 1610 | return *this; |
| 1611 | } |
| 1612 | |
| 1613 | constexpr year_month_day& |
| 1614 | operator+=(const years& __y) noexcept |
| 1615 | { |
| 1616 | *this = *this + __y; |
| 1617 | return *this; |
| 1618 | } |
| 1619 | |
| 1620 | constexpr year_month_day& |
| 1621 | operator-=(const years& __y) noexcept |
| 1622 | { |
| 1623 | *this = *this - __y; |
| 1624 | return *this; |
| 1625 | } |
| 1626 | |
| 1627 | constexpr chrono::year |
| 1628 | year() const noexcept |
| 1629 | { return _M_y; } |
| 1630 | |
| 1631 | constexpr chrono::month |
| 1632 | month() const noexcept |
| 1633 | { return _M_m; } |
| 1634 | |
| 1635 | constexpr chrono::day |
| 1636 | day() const noexcept |
| 1637 | { return _M_d; } |
| 1638 | |
| 1639 | constexpr |
| 1640 | operator sys_days() const noexcept |
| 1641 | { return sys_days{_M_days_since_epoch()}; } |
| 1642 | |
| 1643 | explicit constexpr |
| 1644 | operator local_days() const noexcept |
| 1645 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
| 1646 | |
| 1647 | constexpr bool ok() const noexcept; |
| 1648 | |
| 1649 | friend constexpr bool |
| 1650 | operator==(const year_month_day& __x, const year_month_day& __y) noexcept |
| 1651 | { |
| 1652 | return __x.year() == __y.year() |
| 1653 | && __x.month() == __y.month() |
| 1654 | && __x.day() == __y.day(); |
| 1655 | } |
| 1656 | |
| 1657 | friend constexpr strong_ordering |
| 1658 | operator<=>(const year_month_day& __x, const year_month_day& __y) noexcept |
| 1659 | = default; |
| 1660 | |
| 1661 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1662 | friend constexpr year_month_day |
| 1663 | operator+(const year_month_day& __ymd, const months& __dm) noexcept |
| 1664 | { return (__ymd.year() / __ymd.month() + __dm) / __ymd.day(); } |
| 1665 | |
| 1666 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1667 | friend constexpr year_month_day |
| 1668 | operator+(const months& __dm, const year_month_day& __ymd) noexcept |
| 1669 | { return __ymd + __dm; } |
| 1670 | |
| 1671 | friend constexpr year_month_day |
| 1672 | operator+(const year_month_day& __ymd, const years& __dy) noexcept |
| 1673 | { return (__ymd.year() + __dy) / __ymd.month() / __ymd.day(); } |
| 1674 | |
| 1675 | friend constexpr year_month_day |
| 1676 | operator+(const years& __dy, const year_month_day& __ymd) noexcept |
| 1677 | { return __ymd + __dy; } |
| 1678 | |
| 1679 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1680 | friend constexpr year_month_day |
| 1681 | operator-(const year_month_day& __ymd, const months& __dm) noexcept |
| 1682 | { return __ymd + -__dm; } |
| 1683 | |
| 1684 | friend constexpr year_month_day |
| 1685 | operator-(const year_month_day& __ymd, const years& __dy) noexcept |
| 1686 | { return __ymd + -__dy; } |
| 1687 | |
| 1688 | friend constexpr year_month_day |
| 1689 | operator/(const year_month& __ym, const chrono::day& __d) noexcept |
| 1690 | { return {__ym.year(), __ym.month(), __d}; } |
| 1691 | |
| 1692 | friend constexpr year_month_day |
| 1693 | operator/(const year_month& __ym, int __d) noexcept |
| 1694 | { return __ym / chrono::day{unsigned(__d)}; } |
| 1695 | |
| 1696 | friend constexpr year_month_day |
| 1697 | operator/(const chrono::year& __y, const month_day& __md) noexcept |
| 1698 | { return __y / __md.month() / __md.day(); } |
| 1699 | |
| 1700 | friend constexpr year_month_day |
| 1701 | operator/(int __y, const month_day& __md) noexcept |
| 1702 | { return chrono::year{__y} / __md; } |
| 1703 | |
| 1704 | friend constexpr year_month_day |
| 1705 | operator/(const month_day& __md, const chrono::year& __y) noexcept |
| 1706 | { return __y / __md; } |
| 1707 | |
| 1708 | friend constexpr year_month_day |
| 1709 | operator/(const month_day& __md, int __y) noexcept |
| 1710 | { return chrono::year(__y) / __md; } |
| 1711 | }; |
| 1712 | |
| 1713 | // Construct from days since 1970/01/01. |
| 1714 | // Proposition 6.3 of Neri and Schneider, |
| 1715 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". |
| 1716 | // https://arxiv.org/abs/2102.06959 |
| 1717 | constexpr year_month_day |
| 1718 | year_month_day::_S_from_days(const days& __dp) noexcept |
| 1719 | { |
| 1720 | constexpr auto __z2 = static_cast<uint32_t>(-1468000); |
| 1721 | constexpr auto __r2_e3 = static_cast<uint32_t>(536895458); |
| 1722 | |
| 1723 | const auto __r0 = static_cast<uint32_t>(__dp.count()) + __r2_e3; |
| 1724 | |
| 1725 | const auto __n1 = 4 * __r0 + 3; |
| 1726 | const auto __q1 = __n1 / 146097; |
| 1727 | const auto __r1 = __n1 % 146097 / 4; |
| 1728 | |
| 1729 | constexpr auto __p32 = static_cast<uint64_t>(1) << 32; |
| 1730 | const auto __n2 = 4 * __r1 + 3; |
| 1731 | const auto __u2 = static_cast<uint64_t>(2939745) * __n2; |
| 1732 | const auto __q2 = static_cast<uint32_t>(__u2 / __p32); |
| 1733 | const auto __r2 = static_cast<uint32_t>(__u2 % __p32) / 2939745 / 4; |
| 1734 | |
| 1735 | constexpr auto __p16 = static_cast<uint32_t>(1) << 16; |
| 1736 | const auto __n3 = 2141 * __r2 + 197913; |
| 1737 | const auto __q3 = __n3 / __p16; |
| 1738 | const auto __r3 = __n3 % __p16 / 2141; |
| 1739 | |
| 1740 | const auto __y0 = 100 * __q1 + __q2; |
| 1741 | const auto __m0 = __q3; |
| 1742 | const auto __d0 = __r3; |
| 1743 | |
| 1744 | const auto __j = __r2 >= 306; |
| 1745 | const auto __y1 = __y0 + __j; |
| 1746 | const auto __m1 = __j ? __m0 - 12 : __m0; |
| 1747 | const auto __d1 = __d0 + 1; |
| 1748 | |
| 1749 | return year_month_day{chrono::year{static_cast<int>(__y1 + __z2)}, |
| 1750 | chrono::month{__m1}, chrono::day{__d1}}; |
| 1751 | } |
| 1752 | |
| 1753 | // Days since 1970/01/01. |
| 1754 | // Proposition 6.2 of Neri and Schneider, |
| 1755 | // "Euclidean Affine Functions and Applications to Calendar Algorithms". |
| 1756 | // https://arxiv.org/abs/2102.06959 |
| 1757 | constexpr days |
| 1758 | year_month_day::_M_days_since_epoch() const noexcept |
| 1759 | { |
| 1760 | auto constexpr __z2 = static_cast<uint32_t>(-1468000); |
| 1761 | auto constexpr __r2_e3 = static_cast<uint32_t>(536895458); |
| 1762 | |
| 1763 | const auto __y1 = static_cast<uint32_t>(static_cast<int>(_M_y)) - __z2; |
| 1764 | const auto __m1 = static_cast<uint32_t>(static_cast<unsigned>(_M_m)); |
| 1765 | const auto __d1 = static_cast<uint32_t>(static_cast<unsigned>(_M_d)); |
| 1766 | |
| 1767 | const auto __j = static_cast<uint32_t>(__m1 < 3); |
| 1768 | const auto __y0 = __y1 - __j; |
| 1769 | const auto __m0 = __j ? __m1 + 12 : __m1; |
| 1770 | const auto __d0 = __d1 - 1; |
| 1771 | |
| 1772 | const auto __q1 = __y0 / 100; |
| 1773 | const auto __yc = 1461 * __y0 / 4 - __q1 + __q1 / 4; |
| 1774 | const auto __mc = (979 *__m0 - 2919) / 32; |
| 1775 | const auto __dc = __d0; |
| 1776 | |
| 1777 | return days{static_cast<int32_t>(__yc + __mc + __dc - __r2_e3)}; |
| 1778 | } |
| 1779 | |
| 1780 | // YEAR_MONTH_DAY_LAST |
| 1781 | |
| 1782 | class year_month_day_last |
| 1783 | { |
| 1784 | private: |
| 1785 | chrono::year _M_y; |
| 1786 | chrono::month_day_last _M_mdl; |
| 1787 | |
| 1788 | public: |
| 1789 | constexpr |
| 1790 | year_month_day_last(const chrono::year& __y, |
| 1791 | const chrono::month_day_last& __mdl) noexcept |
| 1792 | : _M_y{__y}, _M_mdl{__mdl} |
| 1793 | { } |
| 1794 | |
| 1795 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1796 | constexpr year_month_day_last& |
| 1797 | operator+=(const months& __m) noexcept |
| 1798 | { |
| 1799 | *this = *this + __m; |
| 1800 | return *this; |
| 1801 | } |
| 1802 | |
| 1803 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1804 | constexpr year_month_day_last& |
| 1805 | operator-=(const months& __m) noexcept |
| 1806 | { |
| 1807 | *this = *this - __m; |
| 1808 | return *this; |
| 1809 | } |
| 1810 | |
| 1811 | constexpr year_month_day_last& |
| 1812 | operator+=(const years& __y) noexcept |
| 1813 | { |
| 1814 | *this = *this + __y; |
| 1815 | return *this; |
| 1816 | } |
| 1817 | |
| 1818 | constexpr year_month_day_last& |
| 1819 | operator-=(const years& __y) noexcept |
| 1820 | { |
| 1821 | *this = *this - __y; |
| 1822 | return *this; |
| 1823 | } |
| 1824 | |
| 1825 | constexpr chrono::year |
| 1826 | year() const noexcept |
| 1827 | { return _M_y; } |
| 1828 | |
| 1829 | constexpr chrono::month |
| 1830 | month() const noexcept |
| 1831 | { return _M_mdl.month(); } |
| 1832 | |
| 1833 | constexpr chrono::month_day_last |
| 1834 | month_day_last() const noexcept |
| 1835 | { return _M_mdl; } |
| 1836 | |
| 1837 | // Return A day representing the last day of this year, month pair. |
| 1838 | constexpr chrono::day |
| 1839 | day() const noexcept |
| 1840 | { |
| 1841 | const auto __m = static_cast<unsigned>(month()); |
| 1842 | |
| 1843 | // The result is unspecified if __m < 1 or __m > 12. Hence, assume |
| 1844 | // 1 <= __m <= 12. For __m != 2, day() == 30 or day() == 31 or, in |
| 1845 | // other words, day () == 30 | b, where b is in {0, 1}. |
| 1846 | |
| 1847 | // If __m in {1, 3, 4, 5, 6, 7}, then b is 1 if, and only if, __m is |
| 1848 | // odd. Hence, b = __m & 1 = (__m ^ 0) & 1. |
| 1849 | |
| 1850 | // If __m in {8, 9, 10, 11, 12}, then b is 1 if, and only if, __m is |
| 1851 | // even. Hence, b = (__m ^ 1) & 1. |
| 1852 | |
| 1853 | // Therefore, b = (__m ^ c) & 1, where c = 0, if __m < 8, or c = 1 if |
| 1854 | // __m >= 8, that is, c = __m >> 3. |
| 1855 | |
| 1856 | // Since 30 = (11110)_2 and __m <= 31 = (11111)_2, the "& 1" in b's |
| 1857 | // calculation is unnecessary. |
| 1858 | |
| 1859 | // The performance of this implementation does not depend on look-up |
| 1860 | // tables being on the L1 cache. |
| 1861 | return chrono::day{__m != 2 ? (__m ^ (__m >> 3)) | 30 |
| 1862 | : _M_y.is_leap() ? 29 : 28}; |
| 1863 | } |
| 1864 | |
| 1865 | constexpr |
| 1866 | operator sys_days() const noexcept |
| 1867 | { return sys_days{year() / month() / day()}; } |
| 1868 | |
| 1869 | explicit constexpr |
| 1870 | operator local_days() const noexcept |
| 1871 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
| 1872 | |
| 1873 | constexpr bool |
| 1874 | ok() const noexcept |
| 1875 | { return _M_y.ok() && _M_mdl.ok(); } |
| 1876 | |
| 1877 | friend constexpr bool |
| 1878 | operator==(const year_month_day_last& __x, |
| 1879 | const year_month_day_last& __y) noexcept |
| 1880 | { |
| 1881 | return __x.year() == __y.year() |
| 1882 | && __x.month_day_last() == __y.month_day_last(); |
| 1883 | } |
| 1884 | |
| 1885 | friend constexpr strong_ordering |
| 1886 | operator<=>(const year_month_day_last& __x, |
| 1887 | const year_month_day_last& __y) noexcept |
| 1888 | = default; |
| 1889 | |
| 1890 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1891 | friend constexpr year_month_day_last |
| 1892 | operator+(const year_month_day_last& __ymdl, |
| 1893 | const months& __dm) noexcept |
| 1894 | { return (__ymdl.year() / __ymdl.month() + __dm) / last; } |
| 1895 | |
| 1896 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1897 | friend constexpr year_month_day_last |
| 1898 | operator+(const months& __dm, |
| 1899 | const year_month_day_last& __ymdl) noexcept |
| 1900 | { return __ymdl + __dm; } |
| 1901 | |
| 1902 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1903 | friend constexpr year_month_day_last |
| 1904 | operator-(const year_month_day_last& __ymdl, |
| 1905 | const months& __dm) noexcept |
| 1906 | { return __ymdl + -__dm; } |
| 1907 | |
| 1908 | friend constexpr year_month_day_last |
| 1909 | operator+(const year_month_day_last& __ymdl, |
| 1910 | const years& __dy) noexcept |
| 1911 | { return {__ymdl.year() + __dy, __ymdl.month_day_last()}; } |
| 1912 | |
| 1913 | friend constexpr year_month_day_last |
| 1914 | operator+(const years& __dy, |
| 1915 | const year_month_day_last& __ymdl) noexcept |
| 1916 | { return __ymdl + __dy; } |
| 1917 | |
| 1918 | friend constexpr year_month_day_last |
| 1919 | operator-(const year_month_day_last& __ymdl, |
| 1920 | const years& __dy) noexcept |
| 1921 | { return __ymdl + -__dy; } |
| 1922 | |
| 1923 | friend constexpr year_month_day_last |
| 1924 | operator/(const year_month& __ym, last_spec) noexcept |
| 1925 | { return {__ym.year(), chrono::month_day_last{__ym.month()}}; } |
| 1926 | |
| 1927 | friend constexpr year_month_day_last |
| 1928 | operator/(const chrono::year& __y, |
| 1929 | const chrono::month_day_last& __mdl) noexcept |
| 1930 | { return {__y, __mdl}; } |
| 1931 | |
| 1932 | friend constexpr year_month_day_last |
| 1933 | operator/(int __y, const chrono::month_day_last& __mdl) noexcept |
| 1934 | { return chrono::year(__y) / __mdl; } |
| 1935 | |
| 1936 | friend constexpr year_month_day_last |
| 1937 | operator/(const chrono::month_day_last& __mdl, |
| 1938 | const chrono::year& __y) noexcept |
| 1939 | { return __y / __mdl; } |
| 1940 | |
| 1941 | friend constexpr year_month_day_last |
| 1942 | operator/(const chrono::month_day_last& __mdl, int __y) noexcept |
| 1943 | { return chrono::year(__y) / __mdl; } |
| 1944 | }; |
| 1945 | |
| 1946 | // year_month_day ctor from year_month_day_last |
| 1947 | constexpr |
| 1948 | year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept |
| 1949 | : _M_y{__ymdl.year()}, _M_m{__ymdl.month()}, _M_d{__ymdl.day()} |
| 1950 | { } |
| 1951 | |
| 1952 | constexpr bool |
| 1953 | year_month_day::ok() const noexcept |
| 1954 | { |
| 1955 | if (!_M_y.ok() || !_M_m.ok()) |
| 1956 | return false; |
| 1957 | return chrono::day{1} <= _M_d && _M_d <= (_M_y / _M_m / last).day(); |
| 1958 | } |
| 1959 | |
| 1960 | // YEAR_MONTH_WEEKDAY |
| 1961 | |
| 1962 | class year_month_weekday |
| 1963 | { |
| 1964 | private: |
| 1965 | chrono::year _M_y; |
| 1966 | chrono::month _M_m; |
| 1967 | chrono::weekday_indexed _M_wdi; |
| 1968 | |
| 1969 | static constexpr year_month_weekday |
| 1970 | _S_from_sys_days(const sys_days& __dp) |
| 1971 | { |
| 1972 | year_month_day __ymd{__dp}; |
| 1973 | chrono::weekday __wd{__dp}; |
| 1974 | auto __index = __wd[(unsigned{__ymd.day()} - 1) / 7 + 1]; |
| 1975 | return {__ymd.year(), __ymd.month(), __index}; |
| 1976 | } |
| 1977 | |
| 1978 | public: |
| 1979 | year_month_weekday() = default; |
| 1980 | |
| 1981 | constexpr |
| 1982 | year_month_weekday(const chrono::year& __y, const chrono::month& __m, |
| 1983 | const chrono::weekday_indexed& __wdi) noexcept |
| 1984 | : _M_y{__y}, _M_m{__m}, _M_wdi{__wdi} |
| 1985 | { } |
| 1986 | |
| 1987 | constexpr |
| 1988 | year_month_weekday(const sys_days& __dp) noexcept |
| 1989 | : year_month_weekday{_S_from_sys_days(__dp)} |
| 1990 | { } |
| 1991 | |
| 1992 | explicit constexpr |
| 1993 | year_month_weekday(const local_days& __dp) noexcept |
| 1994 | : year_month_weekday{sys_days{__dp.time_since_epoch()}} |
| 1995 | { } |
| 1996 | |
| 1997 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 1998 | constexpr year_month_weekday& |
| 1999 | operator+=(const months& __m) noexcept |
| 2000 | { |
| 2001 | *this = *this + __m; |
| 2002 | return *this; |
| 2003 | } |
| 2004 | |
| 2005 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2006 | constexpr year_month_weekday& |
| 2007 | operator-=(const months& __m) noexcept |
| 2008 | { |
| 2009 | *this = *this - __m; |
| 2010 | return *this; |
| 2011 | } |
| 2012 | |
| 2013 | constexpr year_month_weekday& |
| 2014 | operator+=(const years& __y) noexcept |
| 2015 | { |
| 2016 | *this = *this + __y; |
| 2017 | return *this; |
| 2018 | } |
| 2019 | |
| 2020 | constexpr year_month_weekday& |
| 2021 | operator-=(const years& __y) noexcept |
| 2022 | { |
| 2023 | *this = *this - __y; |
| 2024 | return *this; |
| 2025 | } |
| 2026 | |
| 2027 | constexpr chrono::year |
| 2028 | year() const noexcept |
| 2029 | { return _M_y; } |
| 2030 | |
| 2031 | constexpr chrono::month |
| 2032 | month() const noexcept |
| 2033 | { return _M_m; } |
| 2034 | |
| 2035 | constexpr chrono::weekday |
| 2036 | weekday() const noexcept |
| 2037 | { return _M_wdi.weekday(); } |
| 2038 | |
| 2039 | constexpr unsigned |
| 2040 | index() const noexcept |
| 2041 | { return _M_wdi.index(); } |
| 2042 | |
| 2043 | constexpr chrono::weekday_indexed |
| 2044 | weekday_indexed() const noexcept |
| 2045 | { return _M_wdi; } |
| 2046 | |
| 2047 | constexpr |
| 2048 | operator sys_days() const noexcept |
| 2049 | { |
| 2050 | auto __d = sys_days{year() / month() / 1}; |
| 2051 | return __d + (weekday() - chrono::weekday(__d) |
| 2052 | + days{(static_cast<int>(index())-1)*7}); |
| 2053 | } |
| 2054 | |
| 2055 | explicit constexpr |
| 2056 | operator local_days() const noexcept |
| 2057 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
| 2058 | |
| 2059 | constexpr bool |
| 2060 | ok() const noexcept |
| 2061 | { |
| 2062 | if (!_M_y.ok() || !_M_m.ok() || !_M_wdi.ok()) |
| 2063 | return false; |
| 2064 | if (_M_wdi.index() <= 4) |
| 2065 | return true; |
| 2066 | days __d = (_M_wdi.weekday() |
| 2067 | - chrono::weekday{sys_days{_M_y / _M_m / 1}} |
| 2068 | + days((_M_wdi.index()-1)*7 + 1)); |
| 2069 | __glibcxx_assert(__d.count() >= 1); |
| 2070 | return (unsigned)__d.count() <= (unsigned)(_M_y / _M_m / last).day(); |
| 2071 | } |
| 2072 | |
| 2073 | friend constexpr bool |
| 2074 | operator==(const year_month_weekday& __x, |
| 2075 | const year_month_weekday& __y) noexcept |
| 2076 | { |
| 2077 | return __x.year() == __y.year() |
| 2078 | && __x.month() == __y.month() |
| 2079 | && __x.weekday_indexed() == __y.weekday_indexed(); |
| 2080 | } |
| 2081 | |
| 2082 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2083 | friend constexpr year_month_weekday |
| 2084 | operator+(const year_month_weekday& __ymwd, const months& __dm) noexcept |
| 2085 | { |
| 2086 | return ((__ymwd.year() / __ymwd.month() + __dm) |
| 2087 | / __ymwd.weekday_indexed()); |
| 2088 | } |
| 2089 | |
| 2090 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2091 | friend constexpr year_month_weekday |
| 2092 | operator+(const months& __dm, const year_month_weekday& __ymwd) noexcept |
| 2093 | { return __ymwd + __dm; } |
| 2094 | |
| 2095 | friend constexpr year_month_weekday |
| 2096 | operator+(const year_month_weekday& __ymwd, const years& __dy) noexcept |
| 2097 | { return {__ymwd.year() + __dy, __ymwd.month(), __ymwd.weekday_indexed()}; } |
| 2098 | |
| 2099 | friend constexpr year_month_weekday |
| 2100 | operator+(const years& __dy, const year_month_weekday& __ymwd) noexcept |
| 2101 | { return __ymwd + __dy; } |
| 2102 | |
| 2103 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2104 | friend constexpr year_month_weekday |
| 2105 | operator-(const year_month_weekday& __ymwd, const months& __dm) noexcept |
| 2106 | { return __ymwd + -__dm; } |
| 2107 | |
| 2108 | friend constexpr year_month_weekday |
| 2109 | operator-(const year_month_weekday& __ymwd, const years& __dy) noexcept |
| 2110 | { return __ymwd + -__dy; } |
| 2111 | |
| 2112 | friend constexpr year_month_weekday |
| 2113 | operator/(const year_month& __ym, |
| 2114 | const chrono::weekday_indexed& __wdi) noexcept |
| 2115 | { return {__ym.year(), __ym.month(), __wdi}; } |
| 2116 | |
| 2117 | friend constexpr year_month_weekday |
| 2118 | operator/(const chrono::year& __y, const month_weekday& __mwd) noexcept |
| 2119 | { return {__y, __mwd.month(), __mwd.weekday_indexed()}; } |
| 2120 | |
| 2121 | friend constexpr year_month_weekday |
| 2122 | operator/(int __y, const month_weekday& __mwd) noexcept |
| 2123 | { return chrono::year(__y) / __mwd; } |
| 2124 | |
| 2125 | friend constexpr year_month_weekday |
| 2126 | operator/(const month_weekday& __mwd, const chrono::year& __y) noexcept |
| 2127 | { return __y / __mwd; } |
| 2128 | |
| 2129 | friend constexpr year_month_weekday |
| 2130 | operator/(const month_weekday& __mwd, int __y) noexcept |
| 2131 | { return chrono::year(__y) / __mwd; } |
| 2132 | }; |
| 2133 | |
| 2134 | // YEAR_MONTH_WEEKDAY_LAST |
| 2135 | |
| 2136 | class year_month_weekday_last |
| 2137 | { |
| 2138 | private: |
| 2139 | chrono::year _M_y; |
| 2140 | chrono::month _M_m; |
| 2141 | chrono::weekday_last _M_wdl; |
| 2142 | |
| 2143 | public: |
| 2144 | constexpr |
| 2145 | year_month_weekday_last(const chrono::year& __y, const chrono::month& __m, |
| 2146 | const chrono::weekday_last& __wdl) noexcept |
| 2147 | : _M_y{__y}, _M_m{__m}, _M_wdl{__wdl} |
| 2148 | { } |
| 2149 | |
| 2150 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2151 | constexpr year_month_weekday_last& |
| 2152 | operator+=(const months& __m) noexcept |
| 2153 | { |
| 2154 | *this = *this + __m; |
| 2155 | return *this; |
| 2156 | } |
| 2157 | |
| 2158 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2159 | constexpr year_month_weekday_last& |
| 2160 | operator-=(const months& __m) noexcept |
| 2161 | { |
| 2162 | *this = *this - __m; |
| 2163 | return *this; |
| 2164 | } |
| 2165 | |
| 2166 | constexpr year_month_weekday_last& |
| 2167 | operator+=(const years& __y) noexcept |
| 2168 | { |
| 2169 | *this = *this + __y; |
| 2170 | return *this; |
| 2171 | } |
| 2172 | |
| 2173 | constexpr year_month_weekday_last& |
| 2174 | operator-=(const years& __y) noexcept |
| 2175 | { |
| 2176 | *this = *this - __y; |
| 2177 | return *this; |
| 2178 | } |
| 2179 | |
| 2180 | constexpr chrono::year |
| 2181 | year() const noexcept |
| 2182 | { return _M_y; } |
| 2183 | |
| 2184 | constexpr chrono::month |
| 2185 | month() const noexcept |
| 2186 | { return _M_m; } |
| 2187 | |
| 2188 | constexpr chrono::weekday |
| 2189 | weekday() const noexcept |
| 2190 | { return _M_wdl.weekday(); } |
| 2191 | |
| 2192 | constexpr chrono::weekday_last |
| 2193 | weekday_last() const noexcept |
| 2194 | { return _M_wdl; } |
| 2195 | |
| 2196 | constexpr |
| 2197 | operator sys_days() const noexcept |
| 2198 | { |
| 2199 | const auto __d = sys_days{_M_y / _M_m / last}; |
| 2200 | return sys_days{(__d - (chrono::weekday{__d} |
| 2201 | - _M_wdl.weekday())).time_since_epoch()}; |
| 2202 | } |
| 2203 | |
| 2204 | explicit constexpr |
| 2205 | operator local_days() const noexcept |
| 2206 | { return local_days{sys_days{*this}.time_since_epoch()}; } |
| 2207 | |
| 2208 | constexpr bool |
| 2209 | ok() const noexcept |
| 2210 | { return _M_y.ok() && _M_m.ok() && _M_wdl.ok(); } |
| 2211 | |
| 2212 | friend constexpr bool |
| 2213 | operator==(const year_month_weekday_last& __x, |
| 2214 | const year_month_weekday_last& __y) noexcept |
| 2215 | { |
| 2216 | return __x.year() == __y.year() |
| 2217 | && __x.month() == __y.month() |
| 2218 | && __x.weekday_last() == __y.weekday_last(); |
| 2219 | } |
| 2220 | |
| 2221 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2222 | friend constexpr year_month_weekday_last |
| 2223 | operator+(const year_month_weekday_last& __ymwdl, |
| 2224 | const months& __dm) noexcept |
| 2225 | { |
| 2226 | return ((__ymwdl.year() / __ymwdl.month() + __dm) |
| 2227 | / __ymwdl.weekday_last()); |
| 2228 | } |
| 2229 | |
| 2230 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2231 | friend constexpr year_month_weekday_last |
| 2232 | operator+(const months& __dm, |
| 2233 | const year_month_weekday_last& __ymwdl) noexcept |
| 2234 | { return __ymwdl + __dm; } |
| 2235 | |
| 2236 | friend constexpr year_month_weekday_last |
| 2237 | operator+(const year_month_weekday_last& __ymwdl, |
| 2238 | const years& __dy) noexcept |
| 2239 | { return {__ymwdl.year() + __dy, __ymwdl.month(), __ymwdl.weekday_last()}; } |
| 2240 | |
| 2241 | friend constexpr year_month_weekday_last |
| 2242 | operator+(const years& __dy, |
| 2243 | const year_month_weekday_last& __ymwdl) noexcept |
| 2244 | { return __ymwdl + __dy; } |
| 2245 | |
| 2246 | template<typename = __detail::__months_years_conversion_disambiguator> |
| 2247 | friend constexpr year_month_weekday_last |
| 2248 | operator-(const year_month_weekday_last& __ymwdl, |
| 2249 | const months& __dm) noexcept |
| 2250 | { return __ymwdl + -__dm; } |
| 2251 | |
| 2252 | friend constexpr year_month_weekday_last |
| 2253 | operator-(const year_month_weekday_last& __ymwdl, |
| 2254 | const years& __dy) noexcept |
| 2255 | { return __ymwdl + -__dy; } |
| 2256 | |
| 2257 | friend constexpr year_month_weekday_last |
| 2258 | operator/(const year_month& __ym, |
| 2259 | const chrono::weekday_last& __wdl) noexcept |
| 2260 | { return {__ym.year(), __ym.month(), __wdl}; } |
| 2261 | |
| 2262 | friend constexpr year_month_weekday_last |
| 2263 | operator/(const chrono::year& __y, |
| 2264 | const chrono::month_weekday_last& __mwdl) noexcept |
| 2265 | { return {__y, __mwdl.month(), __mwdl.weekday_last()}; } |
| 2266 | |
| 2267 | friend constexpr year_month_weekday_last |
| 2268 | operator/(int __y, const chrono::month_weekday_last& __mwdl) noexcept |
| 2269 | { return chrono::year(__y) / __mwdl; } |
| 2270 | |
| 2271 | friend constexpr year_month_weekday_last |
| 2272 | operator/(const chrono::month_weekday_last& __mwdl, |
| 2273 | const chrono::year& __y) noexcept |
| 2274 | { return __y / __mwdl; } |
| 2275 | |
| 2276 | friend constexpr year_month_weekday_last |
| 2277 | operator/(const chrono::month_weekday_last& __mwdl, int __y) noexcept |
| 2278 | { return chrono::year(__y) / __mwdl; } |
| 2279 | }; |
| 2280 | |
| 2281 | // HH_MM_SS |
| 2282 | |
| 2283 | /// @cond undocumented |
| 2284 | namespace __detail |
| 2285 | { |
| 2286 | consteval long long |
| 2287 | __pow10(unsigned __n) |
| 2288 | { |
| 2289 | long long __r = 1; |
| 2290 | while (__n-- > 0) |
| 2291 | __r *= 10; |
| 2292 | return __r; |
| 2293 | } |
| 2294 | |
| 2295 | template<typename _Duration> struct __utc_leap_second; |
| 2296 | } |
| 2297 | /// @endcond |
| 2298 | |
| 2299 | /** Utility for splitting a duration into hours, minutes, and seconds |
| 2300 | * |
| 2301 | * This is a convenience type that provides accessors for the constituent |
| 2302 | * parts (hours, minutes, seconds and subseconds) of a duration. |
| 2303 | * |
| 2304 | * @since C++20 |
| 2305 | */ |
| 2306 | template<typename _Duration> |
| 2307 | class hh_mm_ss |
| 2308 | { |
| 2309 | static_assert( __is_duration<_Duration>::value ); |
| 2310 | |
| 2311 | private: |
| 2312 | static consteval int |
| 2313 | _S_fractional_width() |
| 2314 | { |
| 2315 | auto __den = _Duration::period::den; |
| 2316 | const int __multiplicity_2 = std::__countr_zero(x: (uintmax_t)__den); |
| 2317 | __den >>= __multiplicity_2; |
| 2318 | int __multiplicity_5 = 0; |
| 2319 | while ((__den % 5) == 0) |
| 2320 | { |
| 2321 | ++__multiplicity_5; |
| 2322 | __den /= 5; |
| 2323 | } |
| 2324 | if (__den != 1) |
| 2325 | return 6; |
| 2326 | |
| 2327 | int __width = (__multiplicity_2 > __multiplicity_5 |
| 2328 | ? __multiplicity_2 : __multiplicity_5); |
| 2329 | if (__width > 18) |
| 2330 | __width = 18; |
| 2331 | return __width; |
| 2332 | } |
| 2333 | |
| 2334 | constexpr |
| 2335 | hh_mm_ss(_Duration __d, bool __is_neg) |
| 2336 | : _M_h (duration_cast<chrono::hours>(__d)), |
| 2337 | _M_m (duration_cast<chrono::minutes>(__d - hours())), |
| 2338 | _M_s (duration_cast<chrono::seconds>(__d - hours() - minutes())), |
| 2339 | _M_is_neg(__is_neg) |
| 2340 | { |
| 2341 | auto __ss = __d - hours() - minutes() - seconds(); |
| 2342 | if constexpr (treat_as_floating_point_v<typename precision::rep>) |
| 2343 | _M_ss._M_r = __ss.count(); |
| 2344 | else if constexpr (precision::period::den != 1) |
| 2345 | _M_ss._M_r = duration_cast<precision>(__ss).count(); |
| 2346 | } |
| 2347 | |
| 2348 | static constexpr _Duration |
| 2349 | _S_abs(_Duration __d) |
| 2350 | { |
| 2351 | if constexpr (numeric_limits<typename _Duration::rep>::is_signed) |
| 2352 | return chrono::abs(__d); |
| 2353 | else |
| 2354 | return __d; |
| 2355 | } |
| 2356 | |
| 2357 | public: |
| 2358 | static constexpr unsigned fractional_width = {_S_fractional_width()}; |
| 2359 | |
| 2360 | using precision |
| 2361 | = duration<common_type_t<typename _Duration::rep, |
| 2362 | chrono::seconds::rep>, |
| 2363 | ratio<1, __detail::__pow10(n: fractional_width)>>; |
| 2364 | |
| 2365 | constexpr hh_mm_ss() noexcept = default; |
| 2366 | |
| 2367 | constexpr explicit |
| 2368 | hh_mm_ss(_Duration __d) |
| 2369 | : hh_mm_ss(_S_abs(__d), __d < _Duration::zero()) |
| 2370 | { } |
| 2371 | |
| 2372 | constexpr bool |
| 2373 | is_negative() const noexcept |
| 2374 | { |
| 2375 | if constexpr (!_S_is_unsigned) |
| 2376 | return _M_is_neg; |
| 2377 | else |
| 2378 | return false; |
| 2379 | } |
| 2380 | |
| 2381 | constexpr chrono::hours |
| 2382 | hours() const noexcept |
| 2383 | { return _M_h; } |
| 2384 | |
| 2385 | constexpr chrono::minutes |
| 2386 | minutes() const noexcept |
| 2387 | { return _M_m; } |
| 2388 | |
| 2389 | constexpr chrono::seconds |
| 2390 | seconds() const noexcept |
| 2391 | { return _M_s; } |
| 2392 | |
| 2393 | constexpr precision |
| 2394 | subseconds() const noexcept |
| 2395 | { return static_cast<precision>(_M_ss); } |
| 2396 | |
| 2397 | constexpr explicit |
| 2398 | operator precision() const noexcept |
| 2399 | { return to_duration(); } |
| 2400 | |
| 2401 | constexpr precision |
| 2402 | to_duration() const noexcept |
| 2403 | { |
| 2404 | if constexpr (!_S_is_unsigned) |
| 2405 | if (_M_is_neg) |
| 2406 | return -(_M_h + _M_m + _M_s + subseconds()); |
| 2407 | return _M_h + _M_m + _M_s + subseconds(); |
| 2408 | } |
| 2409 | |
| 2410 | private: |
| 2411 | static constexpr bool _S_is_unsigned |
| 2412 | = __and_v<is_integral<typename _Duration::rep>, |
| 2413 | is_unsigned<typename _Duration::rep>>; |
| 2414 | |
| 2415 | template<typename _Ratio> |
| 2416 | using __byte_duration = duration<unsigned char, _Ratio>; |
| 2417 | |
| 2418 | // The type of the _M_ss member that holds the subsecond precision. |
| 2419 | template<typename _Dur> |
| 2420 | struct __subseconds |
| 2421 | { |
| 2422 | typename _Dur::rep _M_r{}; |
| 2423 | |
| 2424 | constexpr explicit |
| 2425 | operator _Dur() const noexcept |
| 2426 | { return _Dur(_M_r); } |
| 2427 | }; |
| 2428 | |
| 2429 | // An empty class if this precision doesn't need subseconds. |
| 2430 | template<typename _Rep> |
| 2431 | requires (!treat_as_floating_point_v<_Rep>) |
| 2432 | struct __subseconds<duration<_Rep, ratio<1>>> |
| 2433 | { |
| 2434 | constexpr explicit |
| 2435 | operator duration<_Rep, ratio<1>>() const noexcept |
| 2436 | { return {}; } |
| 2437 | }; |
| 2438 | |
| 2439 | template<typename _Rep, typename _Period> |
| 2440 | requires (!treat_as_floating_point_v<_Rep>) |
| 2441 | && ratio_less_v<_Period, ratio<1, 1>> |
| 2442 | && ratio_greater_equal_v<_Period, ratio<1, 250>> |
| 2443 | struct __subseconds<duration<_Rep, _Period>> |
| 2444 | { |
| 2445 | unsigned char _M_r{}; |
| 2446 | |
| 2447 | constexpr explicit |
| 2448 | operator duration<_Rep, _Period>() const noexcept |
| 2449 | { return duration<_Rep, _Period>(_M_r); } |
| 2450 | }; |
| 2451 | |
| 2452 | template<typename _Rep, typename _Period> |
| 2453 | requires (!treat_as_floating_point_v<_Rep>) |
| 2454 | && ratio_less_v<_Period, ratio<1, 250>> |
| 2455 | && ratio_greater_equal_v<_Period, ratio<1, 4000000000>> |
| 2456 | struct __subseconds<duration<_Rep, _Period>> |
| 2457 | { |
| 2458 | uint_least32_t _M_r{}; |
| 2459 | |
| 2460 | constexpr explicit |
| 2461 | operator duration<_Rep, _Period>() const noexcept |
| 2462 | { return duration<_Rep, _Period>(_M_r); } |
| 2463 | }; |
| 2464 | |
| 2465 | chrono::hours _M_h{}; |
| 2466 | __byte_duration<ratio<60>> _M_m{}; |
| 2467 | __byte_duration<ratio<1>> _M_s{}; |
| 2468 | bool _M_is_neg{}; |
| 2469 | __subseconds<precision> _M_ss{}; |
| 2470 | |
| 2471 | template<typename> friend struct __detail::__utc_leap_second; |
| 2472 | }; |
| 2473 | |
| 2474 | /// @cond undocumented |
| 2475 | namespace __detail |
| 2476 | { |
| 2477 | // Represents a time that is within a leap second insertion. |
| 2478 | template<typename _Duration> |
| 2479 | struct __utc_leap_second |
| 2480 | { |
| 2481 | explicit |
| 2482 | __utc_leap_second(const sys_time<_Duration>& __s) |
| 2483 | : _M_date(chrono::floor<days>(__s)), _M_time(__s - _M_date) |
| 2484 | { |
| 2485 | ++_M_time._M_s; |
| 2486 | } |
| 2487 | |
| 2488 | sys_days _M_date; |
| 2489 | hh_mm_ss<common_type_t<_Duration, days>> _M_time; |
| 2490 | }; |
| 2491 | } |
| 2492 | /// @endcond |
| 2493 | |
| 2494 | // 12/24 HOURS FUNCTIONS |
| 2495 | |
| 2496 | constexpr bool |
| 2497 | is_am(const hours& __h) noexcept |
| 2498 | { return 0h <= __h && __h <= 11h; } |
| 2499 | |
| 2500 | constexpr bool |
| 2501 | is_pm(const hours& __h) noexcept |
| 2502 | { return 12h <= __h && __h <= 23h; } |
| 2503 | |
| 2504 | constexpr hours |
| 2505 | make12(const hours& __h) noexcept |
| 2506 | { |
| 2507 | if (__h == 0h) |
| 2508 | return 12h; |
| 2509 | else if (__h > 12h) |
| 2510 | return __h - 12h; |
| 2511 | return __h; |
| 2512 | } |
| 2513 | |
| 2514 | constexpr hours |
| 2515 | make24(const hours& __h, bool __is_pm) noexcept |
| 2516 | { |
| 2517 | if (!__is_pm) |
| 2518 | { |
| 2519 | if (__h == 12h) |
| 2520 | return 0h; |
| 2521 | else |
| 2522 | return __h; |
| 2523 | } |
| 2524 | else |
| 2525 | { |
| 2526 | if (__h == 12h) |
| 2527 | return __h; |
| 2528 | else |
| 2529 | return __h + 12h; |
| 2530 | } |
| 2531 | } |
| 2532 | |
| 2533 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
| 2534 | // C++20 [time.zones] Time zones |
| 2535 | |
| 2536 | struct tzdb; |
| 2537 | |
| 2538 | struct sys_info |
| 2539 | { |
| 2540 | sys_seconds begin; |
| 2541 | sys_seconds end; |
| 2542 | seconds offset; |
| 2543 | minutes save; |
| 2544 | string abbrev; |
| 2545 | }; |
| 2546 | |
| 2547 | struct local_info |
| 2548 | { |
| 2549 | static constexpr int unique = 0; |
| 2550 | static constexpr int nonexistent = 1; |
| 2551 | static constexpr int ambiguous = 2; |
| 2552 | |
| 2553 | int result; |
| 2554 | sys_info first; |
| 2555 | sys_info second; |
| 2556 | }; |
| 2557 | |
| 2558 | class nonexistent_local_time : public runtime_error |
| 2559 | { |
| 2560 | public: |
| 2561 | template<typename _Duration> |
| 2562 | nonexistent_local_time(const local_time<_Duration>& __tp, |
| 2563 | const local_info& __i) |
| 2564 | : runtime_error(_S_make_what_str(__tp, __i)) |
| 2565 | { __glibcxx_assert(__i.result == local_info::nonexistent); } |
| 2566 | |
| 2567 | private: |
| 2568 | template<typename _Duration> |
| 2569 | static string |
| 2570 | _S_make_what_str(const local_time<_Duration>& __tp, |
| 2571 | const local_info& __i) |
| 2572 | { |
| 2573 | std::ostringstream __os; |
| 2574 | __os << __tp << " is in a gap between\n" |
| 2575 | << local_seconds(__i.first.end.time_since_epoch()) |
| 2576 | + __i.first.offset << ' ' << __i.first.abbrev << " and\n" |
| 2577 | << local_seconds(__i.second.begin.time_since_epoch()) |
| 2578 | + __i.second.offset << ' ' << __i.second.abbrev |
| 2579 | << " which are both equivalent to\n" |
| 2580 | << __i.first.end << " UTC"; |
| 2581 | return std::move(__os).str(); |
| 2582 | } |
| 2583 | }; |
| 2584 | |
| 2585 | class ambiguous_local_time : public runtime_error |
| 2586 | { |
| 2587 | public: |
| 2588 | template<typename _Duration> |
| 2589 | ambiguous_local_time(const local_time<_Duration>& __tp, |
| 2590 | const local_info& __i) |
| 2591 | : runtime_error(_S_make_what_str(__tp, __i)) |
| 2592 | { __glibcxx_assert(__i.result == local_info::ambiguous); } |
| 2593 | |
| 2594 | private: |
| 2595 | template<typename _Duration> |
| 2596 | static string |
| 2597 | _S_make_what_str(const local_time<_Duration>& __tp, |
| 2598 | const local_info& __i) |
| 2599 | { |
| 2600 | std::ostringstream __os; |
| 2601 | __os << __tp << " is ambiguous. It could be\n" |
| 2602 | << __tp << ' ' << __i.first.abbrev << " == " |
| 2603 | << __tp - __i.first.offset << " UTC or\n" |
| 2604 | << __tp << ' ' << __i.second.abbrev << " == " |
| 2605 | << __tp - __i.second.offset << " UTC"; |
| 2606 | return std::move(__os).str(); |
| 2607 | } |
| 2608 | }; |
| 2609 | |
| 2610 | template<typename _Duration> |
| 2611 | [[noreturn]] void |
| 2612 | __throw_bad_local_time(const local_time<_Duration>& __tp, |
| 2613 | const local_info& __i) |
| 2614 | { |
| 2615 | #if __cpp_exceptions |
| 2616 | if (__i.result == local_info::nonexistent) |
| 2617 | throw nonexistent_local_time(__tp, __i); |
| 2618 | throw ambiguous_local_time(__tp, __i); |
| 2619 | #else |
| 2620 | __builtin_abort(); |
| 2621 | #endif |
| 2622 | } |
| 2623 | |
| 2624 | enum class choose { earliest, latest }; |
| 2625 | |
| 2626 | class time_zone |
| 2627 | { |
| 2628 | public: |
| 2629 | time_zone(time_zone&&) = default; |
| 2630 | time_zone& operator=(time_zone&&) = default; |
| 2631 | |
| 2632 | ~time_zone(); |
| 2633 | |
| 2634 | [[nodiscard]] |
| 2635 | string_view name() const noexcept { return _M_name; } |
| 2636 | |
| 2637 | template<typename _Duration> |
| 2638 | sys_info |
| 2639 | get_info(const sys_time<_Duration>& __st) const |
| 2640 | { return _M_get_sys_info(chrono::floor<seconds>(__st)); } |
| 2641 | |
| 2642 | template<typename _Duration> |
| 2643 | local_info |
| 2644 | get_info(const local_time<_Duration>& __tp) const |
| 2645 | { return _M_get_local_info(chrono::floor<seconds>(__tp)); } |
| 2646 | |
| 2647 | template<typename _Duration> |
| 2648 | sys_time<common_type_t<_Duration, seconds>> |
| 2649 | to_sys(const local_time<_Duration>& __tp) const |
| 2650 | { |
| 2651 | local_info __info = get_info(__tp); |
| 2652 | |
| 2653 | if (__info.result != local_info::unique) |
| 2654 | __throw_bad_local_time(__tp, __info); |
| 2655 | |
| 2656 | return sys_time<_Duration>(__tp.time_since_epoch()) |
| 2657 | - __info.first.offset; |
| 2658 | } |
| 2659 | |
| 2660 | template<typename _Duration> |
| 2661 | sys_time<common_type_t<_Duration, seconds>> |
| 2662 | to_sys(const local_time<_Duration>& __tp, choose __z) const |
| 2663 | { |
| 2664 | local_info __info = get_info(__tp); |
| 2665 | |
| 2666 | if (__info.result == local_info::nonexistent) |
| 2667 | return __info.first.end; // Last second of the previous sys_info. |
| 2668 | |
| 2669 | sys_time<_Duration> __st(__tp.time_since_epoch()); |
| 2670 | |
| 2671 | if (__info.result == local_info::ambiguous && __z == choose::latest) |
| 2672 | return __st - __info.second.offset; // Time in the later sys_info. |
| 2673 | // else if __z == earliest, use __info.first.offset as below: |
| 2674 | |
| 2675 | return __st - __info.first.offset; |
| 2676 | } |
| 2677 | |
| 2678 | template<typename _Duration> |
| 2679 | local_time<common_type_t<_Duration, seconds>> |
| 2680 | to_local(const sys_time<_Duration>& __tp) const |
| 2681 | { |
| 2682 | auto __d = (__tp + get_info(__tp).offset).time_since_epoch(); |
| 2683 | return local_time<common_type_t<_Duration, seconds>>(__d); |
| 2684 | } |
| 2685 | |
| 2686 | [[nodiscard]] friend bool |
| 2687 | operator==(const time_zone& __x, const time_zone& __y) noexcept |
| 2688 | { return __x._M_name == __y._M_name; } |
| 2689 | |
| 2690 | [[nodiscard]] friend strong_ordering |
| 2691 | operator<=>(const time_zone& __x, const time_zone& __y) noexcept |
| 2692 | { return __x._M_name <=> __y._M_name; } |
| 2693 | |
| 2694 | private: |
| 2695 | sys_info _M_get_sys_info(sys_seconds) const; |
| 2696 | local_info _M_get_local_info(local_seconds) const; |
| 2697 | |
| 2698 | friend const tzdb& reload_tzdb(); |
| 2699 | friend struct tzdb; |
| 2700 | friend class tzdb_list; |
| 2701 | |
| 2702 | struct _Impl; |
| 2703 | |
| 2704 | explicit time_zone(unique_ptr<_Impl> __p); |
| 2705 | string _M_name; |
| 2706 | unique_ptr<_Impl> _M_impl; |
| 2707 | }; |
| 2708 | |
| 2709 | const time_zone* locate_zone(string_view __tz_name); |
| 2710 | const time_zone* current_zone(); |
| 2711 | |
| 2712 | /** The list of `chrono::tzdb` objects |
| 2713 | * |
| 2714 | * A single object of this type is constructed by the C++ runtime, |
| 2715 | * and can be accessed by calling `chrono::get_tzdb_list()`. |
| 2716 | * |
| 2717 | * The front of the list is the current `tzdb` object and can be accessed |
| 2718 | * via `chrono::get_tzdb_list().front()` or `chrono::get_tzdb()` or |
| 2719 | * `*chrono::get_tzdb_list().begin()`. |
| 2720 | * |
| 2721 | * The `chrono::reload_tzdb()` function will check for a newer version |
| 2722 | * and if found, insert it at the front of the list. |
| 2723 | * |
| 2724 | * @since C++20 |
| 2725 | */ |
| 2726 | class tzdb_list |
| 2727 | { |
| 2728 | struct _Node; |
| 2729 | |
| 2730 | public: |
| 2731 | tzdb_list(const tzdb_list&) = delete; |
| 2732 | tzdb_list& operator=(const tzdb_list&) = delete; |
| 2733 | |
| 2734 | /** An iterator into the `tzdb_list` |
| 2735 | * |
| 2736 | * As a extension, in libstdc++ each `tzdb` is reference-counted |
| 2737 | * and the `const_iterator` type shares ownership of the object it |
| 2738 | * refers to. This ensures that a `tzdb` erased from the list will |
| 2739 | * not be destroyed while there is an iterator that refers to it. |
| 2740 | */ |
| 2741 | class const_iterator |
| 2742 | { |
| 2743 | public: |
| 2744 | using value_type = tzdb; |
| 2745 | using reference = const tzdb&; |
| 2746 | using pointer = const tzdb*; |
| 2747 | using difference_type = ptrdiff_t; |
| 2748 | using iterator_category = forward_iterator_tag; |
| 2749 | |
| 2750 | constexpr const_iterator() = default; |
| 2751 | const_iterator(const const_iterator&) = default; |
| 2752 | const_iterator(const_iterator&&) = default; |
| 2753 | const_iterator& operator=(const const_iterator&) = default; |
| 2754 | const_iterator& operator=(const_iterator&&) = default; |
| 2755 | |
| 2756 | reference operator*() const noexcept; |
| 2757 | pointer operator->() const noexcept { return &**this; } |
| 2758 | const_iterator& operator++(); |
| 2759 | const_iterator operator++(int); |
| 2760 | |
| 2761 | bool operator==(const const_iterator&) const noexcept = default; |
| 2762 | |
| 2763 | private: |
| 2764 | explicit const_iterator(const shared_ptr<_Node>&) noexcept; |
| 2765 | |
| 2766 | friend class tzdb_list; |
| 2767 | |
| 2768 | shared_ptr<_Node> _M_node; |
| 2769 | void* _M_reserved = nullptr; |
| 2770 | }; |
| 2771 | |
| 2772 | /** Access the current `tzdb` at the front of the list. |
| 2773 | * |
| 2774 | * This returns a reference to the same object as `chrono::get_tzdb()`. |
| 2775 | * |
| 2776 | * @returns A reference to the current tzdb object. |
| 2777 | * @since C++20 |
| 2778 | */ |
| 2779 | const tzdb& front() const noexcept; |
| 2780 | |
| 2781 | /** Remove the tzdb object _after_ the one the iterator refers to. |
| 2782 | * |
| 2783 | * Calling this function concurrently with any of `front()`, `begin()`, |
| 2784 | * or `end()` does not cause a data race, but in general this function |
| 2785 | * is not thread-safe. The behaviour may be undefined if erasing an |
| 2786 | * element from the list while another thread is calling the same |
| 2787 | * function, or incrementing an iterator into the list, or accessing |
| 2788 | * the element being erased (unless it is accessed through an iterator). |
| 2789 | * |
| 2790 | * @param __p A dereferenceable iterator. |
| 2791 | * @returns An iterator the element after the one that was erased |
| 2792 | * (or `end()` if there is no such element). |
| 2793 | * @since C++20 |
| 2794 | */ |
| 2795 | const_iterator erase_after(const_iterator __p); |
| 2796 | |
| 2797 | const_iterator begin() const noexcept; |
| 2798 | const_iterator end() const noexcept { return {}; } |
| 2799 | const_iterator cbegin() const noexcept { return begin(); } |
| 2800 | const_iterator cend() const noexcept { return end(); } |
| 2801 | |
| 2802 | private: |
| 2803 | constexpr explicit tzdb_list(nullptr_t); |
| 2804 | |
| 2805 | friend tzdb_list& get_tzdb_list(); |
| 2806 | friend const tzdb& get_tzdb(); |
| 2807 | friend const tzdb& reload_tzdb(); |
| 2808 | friend struct tzdb; |
| 2809 | friend class leap_second; |
| 2810 | friend struct time_zone::_Impl; |
| 2811 | friend class time_zone_link; |
| 2812 | }; |
| 2813 | |
| 2814 | class time_zone_link |
| 2815 | { |
| 2816 | public: |
| 2817 | time_zone_link(time_zone_link&&) = default; |
| 2818 | time_zone_link& operator=(time_zone_link&&) = default; |
| 2819 | |
| 2820 | string_view name() const noexcept { return _M_name; } |
| 2821 | string_view target() const noexcept { return _M_target; } |
| 2822 | |
| 2823 | friend bool |
| 2824 | operator==(const time_zone_link& __x, const time_zone_link& __y) noexcept |
| 2825 | { return __x.name() == __y.name(); } |
| 2826 | |
| 2827 | friend strong_ordering |
| 2828 | operator<=>(const time_zone_link& __x, const time_zone_link& __y) noexcept |
| 2829 | { return __x.name() <=> __y.name(); } |
| 2830 | |
| 2831 | private: |
| 2832 | friend const tzdb& reload_tzdb(); |
| 2833 | friend struct tzdb_list::_Node; |
| 2834 | |
| 2835 | explicit time_zone_link(nullptr_t) { } |
| 2836 | |
| 2837 | string _M_name; |
| 2838 | string _M_target; |
| 2839 | }; |
| 2840 | |
| 2841 | class leap_second |
| 2842 | { |
| 2843 | public: |
| 2844 | leap_second(const leap_second&) = default; |
| 2845 | leap_second& operator=(const leap_second&) = default; |
| 2846 | |
| 2847 | [[nodiscard]] |
| 2848 | constexpr sys_seconds |
| 2849 | date() const noexcept |
| 2850 | { |
| 2851 | if (_M_s >= _M_s.zero()) [[likely]] |
| 2852 | return sys_seconds(_M_s); |
| 2853 | return sys_seconds(-_M_s); |
| 2854 | } |
| 2855 | |
| 2856 | [[nodiscard]] |
| 2857 | constexpr seconds |
| 2858 | value() const noexcept |
| 2859 | { |
| 2860 | if (_M_s >= _M_s.zero()) [[likely]] |
| 2861 | return seconds(1); |
| 2862 | return seconds(-1); |
| 2863 | } |
| 2864 | |
| 2865 | // This can be defaulted because the database will never contain two |
| 2866 | // leap_second objects with the same date but different signs. |
| 2867 | [[nodiscard]] friend constexpr bool |
| 2868 | operator==(const leap_second&, const leap_second&) noexcept = default; |
| 2869 | |
| 2870 | [[nodiscard]] friend constexpr strong_ordering |
| 2871 | operator<=>(const leap_second& __x, const leap_second& __y) noexcept |
| 2872 | { return __x.date() <=> __y.date(); } |
| 2873 | |
| 2874 | template<typename _Duration> |
| 2875 | [[nodiscard]] friend constexpr bool |
| 2876 | operator==(const leap_second& __x, |
| 2877 | const sys_time<_Duration>& __y) noexcept |
| 2878 | { return __x.date() == __y; } |
| 2879 | |
| 2880 | template<typename _Duration> |
| 2881 | [[nodiscard]] friend constexpr bool |
| 2882 | operator<(const leap_second& __x, |
| 2883 | const sys_time<_Duration>& __y) noexcept |
| 2884 | { return __x.date() < __y; } |
| 2885 | |
| 2886 | template<typename _Duration> |
| 2887 | [[nodiscard]] friend constexpr bool |
| 2888 | operator<(const sys_time<_Duration>& __x, |
| 2889 | const leap_second& __y) noexcept |
| 2890 | { return __x < __y.date(); } |
| 2891 | |
| 2892 | template<typename _Duration> |
| 2893 | [[nodiscard]] friend constexpr bool |
| 2894 | operator>(const leap_second& __x, |
| 2895 | const sys_time<_Duration>& __y) noexcept |
| 2896 | { return __y < __x.date(); } |
| 2897 | |
| 2898 | template<typename _Duration> |
| 2899 | [[nodiscard]] friend constexpr bool |
| 2900 | operator>(const sys_time<_Duration>& __x, |
| 2901 | const leap_second& __y) noexcept |
| 2902 | { return __y.date() < __x; } |
| 2903 | |
| 2904 | template<typename _Duration> |
| 2905 | [[nodiscard]] friend constexpr bool |
| 2906 | operator<=(const leap_second& __x, |
| 2907 | const sys_time<_Duration>& __y) noexcept |
| 2908 | { return !(__y < __x.date()); } |
| 2909 | |
| 2910 | template<typename _Duration> |
| 2911 | [[nodiscard]] friend constexpr bool |
| 2912 | operator<=(const sys_time<_Duration>& __x, |
| 2913 | const leap_second& __y) noexcept |
| 2914 | { return !(__y.date() < __x); } |
| 2915 | |
| 2916 | template<typename _Duration> |
| 2917 | [[nodiscard]] friend constexpr bool |
| 2918 | operator>=(const leap_second& __x, |
| 2919 | const sys_time<_Duration>& __y) noexcept |
| 2920 | { return !(__x.date() < __y); } |
| 2921 | |
| 2922 | template<typename _Duration> |
| 2923 | [[nodiscard]] friend constexpr bool |
| 2924 | operator>=(const sys_time<_Duration>& __x, |
| 2925 | const leap_second& __y) noexcept |
| 2926 | { return !(__x < __y.date()); } |
| 2927 | |
| 2928 | template<three_way_comparable_with<seconds> _Duration> |
| 2929 | [[nodiscard]] friend constexpr auto |
| 2930 | operator<=>(const leap_second& __x, |
| 2931 | const sys_time<_Duration>& __y) noexcept |
| 2932 | { return __x.date() <=> __y; } |
| 2933 | |
| 2934 | private: |
| 2935 | explicit leap_second(seconds::rep __s) : _M_s(__s) { } |
| 2936 | |
| 2937 | friend struct tzdb_list::_Node; |
| 2938 | |
| 2939 | friend const tzdb& reload_tzdb(); |
| 2940 | |
| 2941 | template<typename _Duration> |
| 2942 | friend leap_second_info |
| 2943 | get_leap_second_info(const utc_time<_Duration>&); |
| 2944 | |
| 2945 | seconds _M_s; // == date().time_since_epoch() * value().count() |
| 2946 | }; |
| 2947 | |
| 2948 | template<class _Tp> struct zoned_traits { }; |
| 2949 | |
| 2950 | template<> |
| 2951 | struct zoned_traits<const time_zone*> |
| 2952 | { |
| 2953 | static const time_zone* |
| 2954 | default_zone() |
| 2955 | { return std::chrono::locate_zone(tz_name: "UTC"); } |
| 2956 | |
| 2957 | static const time_zone* |
| 2958 | locate_zone(string_view __name) |
| 2959 | { return std::chrono::locate_zone(tz_name: __name); } |
| 2960 | }; |
| 2961 | |
| 2962 | struct tzdb |
| 2963 | { |
| 2964 | string version; |
| 2965 | _GLIBCXX_STD_C::vector<time_zone> zones; |
| 2966 | _GLIBCXX_STD_C::vector<time_zone_link> links; |
| 2967 | _GLIBCXX_STD_C::vector<leap_second> leap_seconds; |
| 2968 | |
| 2969 | const time_zone* |
| 2970 | locate_zone(string_view __tz_name) const; |
| 2971 | |
| 2972 | const time_zone* |
| 2973 | current_zone() const; |
| 2974 | |
| 2975 | private: |
| 2976 | friend const tzdb& reload_tzdb(); |
| 2977 | friend class time_zone; |
| 2978 | friend struct tzdb_list::_Node; |
| 2979 | }; |
| 2980 | |
| 2981 | tzdb_list& get_tzdb_list(); |
| 2982 | const tzdb& get_tzdb(); |
| 2983 | |
| 2984 | const tzdb& reload_tzdb(); |
| 2985 | string remote_version(); |
| 2986 | |
| 2987 | template<typename _Duration, typename _TimeZonePtr = const time_zone*> |
| 2988 | class zoned_time |
| 2989 | { |
| 2990 | static_assert(__is_duration_v<_Duration>); |
| 2991 | |
| 2992 | using _Traits = zoned_traits<_TimeZonePtr>; |
| 2993 | |
| 2994 | // Every constructor that accepts a string_view as its first parameter |
| 2995 | // does not participate in class template argument deduction. |
| 2996 | using string_view = type_identity_t<std::string_view>; |
| 2997 | |
| 2998 | public: |
| 2999 | using duration = common_type_t<_Duration, seconds>; |
| 3000 | |
| 3001 | zoned_time() requires requires { _Traits::default_zone(); } |
| 3002 | { } |
| 3003 | |
| 3004 | zoned_time(const zoned_time&) = default; |
| 3005 | zoned_time& operator=(const zoned_time&) = default; |
| 3006 | |
| 3007 | zoned_time(const sys_time<_Duration>& __st) |
| 3008 | requires requires { _Traits::default_zone(); } |
| 3009 | : _M_tp(__st) |
| 3010 | { } |
| 3011 | |
| 3012 | explicit |
| 3013 | zoned_time(_TimeZonePtr __z) : _M_zone(std::move(__z)) { } |
| 3014 | |
| 3015 | explicit |
| 3016 | zoned_time(string_view __name) |
| 3017 | requires requires { |
| 3018 | _TimeZonePtr{_Traits::locate_zone(std::string_view{})}; |
| 3019 | } |
| 3020 | : _M_zone(_Traits::locate_zone(__name)) |
| 3021 | { } |
| 3022 | |
| 3023 | template<typename _Duration2> |
| 3024 | zoned_time(const zoned_time<_Duration2, _TimeZonePtr>& __zt) |
| 3025 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
| 3026 | : _M_zone(__zt._M_zone), _M_tp(__zt._M_tp) |
| 3027 | { } |
| 3028 | |
| 3029 | zoned_time(_TimeZonePtr __z, const sys_time<_Duration>& __st) |
| 3030 | : _M_zone(std::move(__z)), _M_tp(__st) |
| 3031 | { } |
| 3032 | |
| 3033 | zoned_time(string_view __name, const sys_time<_Duration>& __st) |
| 3034 | : zoned_time(_Traits::locate_zone(__name), __st) |
| 3035 | { } |
| 3036 | |
| 3037 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp) |
| 3038 | requires requires { |
| 3039 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; |
| 3040 | } |
| 3041 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp)) |
| 3042 | { } |
| 3043 | |
| 3044 | zoned_time(string_view __name, const local_time<_Duration>& __tp) |
| 3045 | requires requires (_TimeZonePtr __z) { |
| 3046 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
| 3047 | { __z->to_sys(__tp) } -> convertible_to<sys_time<_Duration>>; |
| 3048 | } |
| 3049 | : zoned_time(_Traits::locate_zone(__name), __tp) |
| 3050 | { } |
| 3051 | |
| 3052 | zoned_time(_TimeZonePtr __z, const local_time<_Duration>& __tp, |
| 3053 | choose __c) |
| 3054 | requires requires { |
| 3055 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; |
| 3056 | } |
| 3057 | : _M_zone(std::move(__z)), _M_tp(_M_zone->to_sys(__tp, __c)) |
| 3058 | { } |
| 3059 | |
| 3060 | zoned_time(string_view __name, const local_time<_Duration>& __tp, |
| 3061 | choose __c) |
| 3062 | requires requires (_TimeZonePtr __z) { |
| 3063 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
| 3064 | { __z->to_sys(__tp, __c) } -> convertible_to<sys_time<_Duration>>; |
| 3065 | } |
| 3066 | : _M_zone(_Traits::locate_zone(__name)), |
| 3067 | _M_tp(_M_zone->to_sys(__tp, __c)) |
| 3068 | { } |
| 3069 | |
| 3070 | template<typename _Duration2, typename _TimeZonePtr2> |
| 3071 | zoned_time(_TimeZonePtr __z, |
| 3072 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) |
| 3073 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
| 3074 | : _M_zone(__z), _M_tp(__zt._M_tp) |
| 3075 | { } |
| 3076 | |
| 3077 | template<typename _Duration2, typename _TimeZonePtr2> |
| 3078 | zoned_time(_TimeZonePtr __z, |
| 3079 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt, |
| 3080 | choose) |
| 3081 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
| 3082 | : _M_zone(__z), _M_tp(__zt._M_tp) |
| 3083 | { } |
| 3084 | |
| 3085 | template<typename _Duration2, typename _TimeZonePtr2> |
| 3086 | zoned_time(string_view __name, |
| 3087 | const zoned_time<_Duration2, _TimeZonePtr2>& __zt) |
| 3088 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
| 3089 | && requires { |
| 3090 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
| 3091 | } |
| 3092 | : _M_zone(_Traits::locate_zone(__name)), _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 | choose) |
| 3099 | requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>> |
| 3100 | && requires { |
| 3101 | { _Traits::locate_zone(__name) } -> convertible_to<_TimeZonePtr>; |
| 3102 | } |
| 3103 | : _M_zone(_Traits::locate_zone(__name)), _M_tp(__zt._M_tp) |
| 3104 | { } |
| 3105 | |
| 3106 | zoned_time& |
| 3107 | operator=(const sys_time<_Duration>& __st) |
| 3108 | { |
| 3109 | _M_tp = __st; |
| 3110 | return *this; |
| 3111 | } |
| 3112 | |
| 3113 | zoned_time& |
| 3114 | operator=(const local_time<_Duration>& __lt) |
| 3115 | { |
| 3116 | _M_tp = _M_zone->to_sys(__lt); |
| 3117 | return *this; |
| 3118 | } |
| 3119 | |
| 3120 | [[nodiscard]] |
| 3121 | operator sys_time<duration>() const { return _M_tp; } |
| 3122 | |
| 3123 | [[nodiscard]] |
| 3124 | explicit operator local_time<duration>() const |
| 3125 | { return get_local_time(); } |
| 3126 | |
| 3127 | [[nodiscard]] |
| 3128 | _TimeZonePtr |
| 3129 | get_time_zone() const |
| 3130 | { return _M_zone; } |
| 3131 | |
| 3132 | [[nodiscard]] |
| 3133 | local_time<duration> |
| 3134 | get_local_time() const |
| 3135 | { return _M_zone->to_local(_M_tp); } |
| 3136 | |
| 3137 | [[nodiscard]] |
| 3138 | sys_time<duration> |
| 3139 | get_sys_time() const |
| 3140 | { return _M_tp; } |
| 3141 | |
| 3142 | [[nodiscard]] |
| 3143 | sys_info |
| 3144 | get_info() const |
| 3145 | { return _M_zone->get_info(_M_tp); } |
| 3146 | |
| 3147 | [[nodiscard]] friend bool |
| 3148 | operator==(const zoned_time&, const zoned_time&) = default; |
| 3149 | |
| 3150 | private: |
| 3151 | _TimeZonePtr _M_zone{ _Traits::default_zone() }; |
| 3152 | sys_time<duration> _M_tp{}; |
| 3153 | |
| 3154 | template<typename _Duration2, typename _TimeZonePtr2> |
| 3155 | friend class zoned_time; |
| 3156 | }; |
| 3157 | |
| 3158 | zoned_time() -> zoned_time<seconds>; |
| 3159 | |
| 3160 | template<typename _Duration> |
| 3161 | zoned_time(sys_time<_Duration>) |
| 3162 | -> zoned_time<common_type_t<_Duration, seconds>>; |
| 3163 | |
| 3164 | /// @cond undocumented |
| 3165 | template<typename _TimeZonePtrOrName> |
| 3166 | using __time_zone_representation |
| 3167 | = __conditional_t<is_convertible_v<_TimeZonePtrOrName, string_view>, |
| 3168 | const time_zone*, |
| 3169 | remove_cvref_t<_TimeZonePtrOrName>>; |
| 3170 | /// @endcond |
| 3171 | |
| 3172 | template<typename _TimeZonePtrOrName> |
| 3173 | zoned_time(_TimeZonePtrOrName&&) |
| 3174 | -> zoned_time<seconds, __time_zone_representation<_TimeZonePtrOrName>>; |
| 3175 | |
| 3176 | template<typename _TimeZonePtrOrName, typename _Duration> |
| 3177 | zoned_time(_TimeZonePtrOrName&&, sys_time<_Duration>) |
| 3178 | -> zoned_time<common_type_t<_Duration, seconds>, |
| 3179 | __time_zone_representation<_TimeZonePtrOrName>>; |
| 3180 | |
| 3181 | template<typename _TimeZonePtrOrName, typename _Duration> |
| 3182 | zoned_time(_TimeZonePtrOrName&&, local_time<_Duration>, |
| 3183 | choose = choose::earliest) |
| 3184 | -> zoned_time<common_type_t<_Duration, seconds>, |
| 3185 | __time_zone_representation<_TimeZonePtrOrName>>; |
| 3186 | |
| 3187 | template<typename _Duration, typename _TimeZonePtrOrName, |
| 3188 | typename _TimeZonePtr2> |
| 3189 | zoned_time(_TimeZonePtrOrName&&, zoned_time<_Duration, _TimeZonePtr2>, |
| 3190 | choose = choose::earliest) |
| 3191 | -> zoned_time<common_type_t<_Duration, seconds>, |
| 3192 | __time_zone_representation<_TimeZonePtrOrName>>; |
| 3193 | |
| 3194 | template<typename _Dur1, typename _TZPtr1, typename _Dur2, typename _TZPtr2> |
| 3195 | [[nodiscard]] |
| 3196 | inline bool |
| 3197 | operator==(const zoned_time<_Dur1, _TZPtr1>& __x, |
| 3198 | const zoned_time<_Dur2, _TZPtr2>& __y) |
| 3199 | { |
| 3200 | return __x.get_time_zone() == __y.get_time_zone() |
| 3201 | && __x.get_sys_time() == __y.get_sys_time(); |
| 3202 | } |
| 3203 | |
| 3204 | using zoned_seconds = zoned_time<seconds>; |
| 3205 | #endif // _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
| 3206 | |
| 3207 | namespace __detail |
| 3208 | { |
| 3209 | inline leap_second_info |
| 3210 | __get_leap_second_info(sys_seconds __ss, bool __is_utc) |
| 3211 | { |
| 3212 | if (__ss < sys_seconds{}) [[unlikely]] |
| 3213 | return {}; |
| 3214 | |
| 3215 | const seconds::rep __leaps[] { |
| 3216 | 78796800, // 1 Jul 1972 |
| 3217 | 94694400, // 1 Jan 1973 |
| 3218 | 126230400, // 1 Jan 1974 |
| 3219 | 157766400, // 1 Jan 1975 |
| 3220 | 189302400, // 1 Jan 1976 |
| 3221 | 220924800, // 1 Jan 1977 |
| 3222 | 252460800, // 1 Jan 1978 |
| 3223 | 283996800, // 1 Jan 1979 |
| 3224 | 315532800, // 1 Jan 1980 |
| 3225 | 362793600, // 1 Jul 1981 |
| 3226 | 394329600, // 1 Jul 1982 |
| 3227 | 425865600, // 1 Jul 1983 |
| 3228 | 489024000, // 1 Jul 1985 |
| 3229 | 567993600, // 1 Jan 1988 |
| 3230 | 631152000, // 1 Jan 1990 |
| 3231 | 662688000, // 1 Jan 1991 |
| 3232 | 709948800, // 1 Jul 1992 |
| 3233 | 741484800, // 1 Jul 1993 |
| 3234 | 773020800, // 1 Jul 1994 |
| 3235 | 820454400, // 1 Jan 1996 |
| 3236 | 867715200, // 1 Jul 1997 |
| 3237 | 915148800, // 1 Jan 1999 |
| 3238 | 1136073600, // 1 Jan 2006 |
| 3239 | 1230768000, // 1 Jan 2009 |
| 3240 | 1341100800, // 1 Jul 2012 |
| 3241 | 1435708800, // 1 Jul 2015 |
| 3242 | 1483228800, // 1 Jan 2017 |
| 3243 | }; |
| 3244 | // The list above is known to be valid until (at least) this date |
| 3245 | // and only contains positive leap seconds. |
| 3246 | const sys_seconds __expires(1735344000s); // 2024-12-28 00:00:00 UTC |
| 3247 | |
| 3248 | #if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI |
| 3249 | if (__ss > __expires) |
| 3250 | { |
| 3251 | // Use updated leap_seconds from tzdb. |
| 3252 | size_t __n = std::size(__leaps); |
| 3253 | |
| 3254 | auto __db = get_tzdb_list().begin(); |
| 3255 | auto __first = __db->leap_seconds.begin() + __n; |
| 3256 | auto __last = __db->leap_seconds.end(); |
| 3257 | auto __pos = std::upper_bound(__first, __last, val: __ss); |
| 3258 | seconds __elapsed(__n); |
| 3259 | for (auto __i = __first; __i != __pos; ++__i) |
| 3260 | __elapsed += __i->value(); |
| 3261 | |
| 3262 | if (__is_utc) |
| 3263 | { |
| 3264 | // Convert utc_time to sys_time: |
| 3265 | __ss -= __elapsed; |
| 3266 | // See if that sys_time is before (or during) previous leap sec: |
| 3267 | if (__pos != __first && __ss < __pos[-1]) |
| 3268 | { |
| 3269 | if ((__ss + 1s) >= __pos[-1]) |
| 3270 | return {.is_leap_second: true, .elapsed: __elapsed}; |
| 3271 | __elapsed -= __pos[-1].value(); |
| 3272 | } |
| 3273 | } |
| 3274 | return {.is_leap_second: false, .elapsed: __elapsed}; |
| 3275 | } |
| 3276 | else |
| 3277 | #endif |
| 3278 | { |
| 3279 | seconds::rep __s = __ss.time_since_epoch().count(); |
| 3280 | const seconds::rep* __first = std::begin(arr: __leaps); |
| 3281 | const seconds::rep* __last = std::end(arr: __leaps); |
| 3282 | |
| 3283 | // Don't bother searching the list if we're after the last one. |
| 3284 | if (__s > (__last[-1] + (__last - __first) + 1)) |
| 3285 | return { .is_leap_second: false, .elapsed: seconds(__last - __first) }; |
| 3286 | |
| 3287 | auto __pos = std::upper_bound(__first, __last, val: __s); |
| 3288 | seconds __elapsed{__pos - __first}; |
| 3289 | if (__is_utc) |
| 3290 | { |
| 3291 | // Convert utc_time to sys_time: |
| 3292 | __s -= __elapsed.count(); |
| 3293 | // See if that sys_time is before (or during) previous leap sec: |
| 3294 | if (__pos != __first && __s < __pos[-1]) |
| 3295 | { |
| 3296 | if ((__s + 1) >= __pos[-1]) |
| 3297 | return {.is_leap_second: true, .elapsed: __elapsed}; |
| 3298 | --__elapsed; |
| 3299 | } |
| 3300 | } |
| 3301 | return {.is_leap_second: false, .elapsed: __elapsed}; |
| 3302 | } |
| 3303 | } |
| 3304 | } // namespace __detail |
| 3305 | |
| 3306 | template<typename _Duration> |
| 3307 | [[nodiscard]] |
| 3308 | inline leap_second_info |
| 3309 | get_leap_second_info(const utc_time<_Duration>& __ut) |
| 3310 | { |
| 3311 | auto __s = chrono::duration_cast<seconds>(__ut.time_since_epoch()); |
| 3312 | return __detail::__get_leap_second_info(ss: sys_seconds(__s), is_utc: true); |
| 3313 | } |
| 3314 | |
| 3315 | template<typename _Duration> |
| 3316 | [[nodiscard]] |
| 3317 | inline utc_time<common_type_t<_Duration, seconds>> |
| 3318 | utc_clock::from_sys(const sys_time<_Duration>& __t) |
| 3319 | { |
| 3320 | using _CDur = common_type_t<_Duration, seconds>; |
| 3321 | auto __s = chrono::time_point_cast<seconds>(__t); |
| 3322 | const auto __li = __detail::__get_leap_second_info(ss: __s, is_utc: false); |
| 3323 | return utc_time<_CDur>{__t.time_since_epoch()} + __li.elapsed; |
| 3324 | } |
| 3325 | |
| 3326 | /// @} group chrono |
| 3327 | #endif // C++20 |
| 3328 | } // namespace chrono |
| 3329 | |
| 3330 | #if __cplusplus >= 202002L |
| 3331 | inline namespace literals |
| 3332 | { |
| 3333 | inline namespace chrono_literals |
| 3334 | { |
| 3335 | /// @addtogroup chrono |
| 3336 | /// @{ |
| 3337 | #pragma GCC diagnostic push |
| 3338 | #pragma GCC diagnostic ignored "-Wliteral-suffix" |
| 3339 | /// Literal suffix for creating chrono::day objects. |
| 3340 | /// @since C++20 |
| 3341 | constexpr chrono::day |
| 3342 | operator""d(unsigned long long __d) noexcept |
| 3343 | { return chrono::day{static_cast<unsigned>(__d)}; } |
| 3344 | |
| 3345 | /// Literal suffix for creating chrono::year objects. |
| 3346 | /// @since C++20 |
| 3347 | constexpr chrono::year |
| 3348 | operator""y(unsigned long long __y) noexcept |
| 3349 | { return chrono::year{static_cast<int>(__y)}; } |
| 3350 | #pragma GCC diagnostic pop |
| 3351 | /// @} |
| 3352 | } // inline namespace chrono_literals |
| 3353 | } // inline namespace literals |
| 3354 | #endif // C++20 |
| 3355 | |
| 3356 | _GLIBCXX_END_NAMESPACE_VERSION |
| 3357 | } // namespace std |
| 3358 | |
| 3359 | #if __cplusplus >= 202002L |
| 3360 | # include <bits/chrono_io.h> |
| 3361 | #endif |
| 3362 | |
| 3363 | #endif // C++11 |
| 3364 | |
| 3365 | #endif //_GLIBCXX_CHRONO |
| 3366 |
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