chrono revision 1.1.1.13
1 // <chrono> -*- C++ -*- 2 3 // Copyright (C) 2008-2020 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file include/chrono 26 * This is a Standard C++ Library header. 27 * @ingroup chrono 28 */ 29 30 #ifndef _GLIBCXX_CHRONO 31 #define _GLIBCXX_CHRONO 1 32 33 #pragma GCC system_header 34 35 #if __cplusplus < 201103L 36 # include <bits/c++0x_warning.h> 37 #else 38 39 #include <ratio> 40 #include <type_traits> 41 #include <limits> 42 #include <ctime> 43 #include <bits/parse_numbers.h> // for literals support. 44 #if __cplusplus > 201703L 45 # include <concepts> 46 # include <compare> 47 #endif 48 49 namespace std _GLIBCXX_VISIBILITY(default) 50 { 51 _GLIBCXX_BEGIN_NAMESPACE_VERSION 52 53 #if __cplusplus >= 201703L 54 namespace filesystem { struct __file_clock; }; 55 #endif 56 57 /** 58 * @defgroup chrono Time 59 * @ingroup utilities 60 * 61 * Classes and functions for time. 62 * @{ 63 */ 64 65 /** @namespace std::chrono 66 * @brief ISO C++ 2011 namespace for date and time utilities 67 */ 68 namespace chrono 69 { 70 template<typename _Rep, typename _Period = ratio<1>> 71 struct duration; 72 73 template<typename _Clock, typename _Dur = typename _Clock::duration> 74 struct time_point; 75 } 76 77 // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly) 78 79 /// @cond undocumented 80 81 template<typename _CT, typename _Period1, typename _Period2, typename = void> 82 struct __duration_common_type 83 { }; 84 85 template<typename _CT, typename _Period1, typename _Period2> 86 struct __duration_common_type<_CT, _Period1, _Period2, 87 __void_t<typename _CT::type>> 88 { 89 private: 90 using __gcd_num = __static_gcd<_Period1::num, _Period2::num>; 91 using __gcd_den = __static_gcd<_Period1::den, _Period2::den>; 92 using __cr = typename _CT::type; 93 using __r = ratio<__gcd_num::value, 94 (_Period1::den / __gcd_den::value) * _Period2::den>; 95 96 public: 97 using type = chrono::duration<__cr, typename __r::type>; 98 }; 99 100 /// @endcond 101 102 /// Specialization of common_type for chrono::duration types. 103 /// @relates duration 104 template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2> 105 struct common_type<chrono::duration<_Rep1, _Period1>, 106 chrono::duration<_Rep2, _Period2>> 107 : __duration_common_type<common_type<_Rep1, _Rep2>, 108 typename _Period1::type, 109 typename _Period2::type> 110 { }; 111 112 /// Specialization of common_type for two identical chrono::duration types. 113 /// @relates duration 114 template<typename _Rep, typename _Period> 115 struct common_type<chrono::duration<_Rep, _Period>, 116 chrono::duration<_Rep, _Period>> 117 { 118 using type = chrono::duration<typename common_type<_Rep>::type, 119 typename _Period::type>; 120 }; 121 122 /// Specialization of common_type for one chrono::duration type. 123 /// @relates duration 124 template<typename _Rep, typename _Period> 125 struct common_type<chrono::duration<_Rep, _Period>> 126 { 127 using type = chrono::duration<typename common_type<_Rep>::type, 128 typename _Period::type>; 129 }; 130 131 // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly) 132 133 /// @cond undocumented 134 135 template<typename _CT, typename _Clock, typename = void> 136 struct __timepoint_common_type 137 { }; 138 139 template<typename _CT, typename _Clock> 140 struct __timepoint_common_type<_CT, _Clock, __void_t<typename _CT::type>> 141 { 142 using type = chrono::time_point<_Clock, typename _CT::type>; 143 }; 144 145 /// @endcond 146 147 /// Specialization of common_type for chrono::time_point types. 148 /// @relates time_point 149 template<typename _Clock, typename _Duration1, typename _Duration2> 150 struct common_type<chrono::time_point<_Clock, _Duration1>, 151 chrono::time_point<_Clock, _Duration2>> 152 : __timepoint_common_type<common_type<_Duration1, _Duration2>, _Clock> 153 { }; 154 155 /// Specialization of common_type for two identical chrono::time_point types. 156 /// @relates time_point 157 template<typename _Clock, typename _Duration> 158 struct common_type<chrono::time_point<_Clock, _Duration>, 159 chrono::time_point<_Clock, _Duration>> 160 { using type = chrono::time_point<_Clock, _Duration>; }; 161 162 /// Specialization of common_type for one chrono::time_point type. 163 /// @relates time_point 164 template<typename _Clock, typename _Duration> 165 struct common_type<chrono::time_point<_Clock, _Duration>> 166 { using type = chrono::time_point<_Clock, _Duration>; }; 167 168 /// @} group chrono 169 170 namespace chrono 171 { 172 /// @addtogroup chrono 173 /// @{ 174 175 /// @cond undocumented 176 177 // Primary template for duration_cast impl. 178 template<typename _ToDur, typename _CF, typename _CR, 179 bool _NumIsOne = false, bool _DenIsOne = false> 180 struct __duration_cast_impl 181 { 182 template<typename _Rep, typename _Period> 183 static constexpr _ToDur 184 __cast(const duration<_Rep, _Period>& __d) 185 { 186 typedef typename _ToDur::rep __to_rep; 187 return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count()) 188 * static_cast<_CR>(_CF::num) 189 / static_cast<_CR>(_CF::den))); 190 } 191 }; 192 193 template<typename _ToDur, typename _CF, typename _CR> 194 struct __duration_cast_impl<_ToDur, _CF, _CR, true, true> 195 { 196 template<typename _Rep, typename _Period> 197 static constexpr _ToDur 198 __cast(const duration<_Rep, _Period>& __d) 199 { 200 typedef typename _ToDur::rep __to_rep; 201 return _ToDur(static_cast<__to_rep>(__d.count())); 202 } 203 }; 204 205 template<typename _ToDur, typename _CF, typename _CR> 206 struct __duration_cast_impl<_ToDur, _CF, _CR, true, false> 207 { 208 template<typename _Rep, typename _Period> 209 static constexpr _ToDur 210 __cast(const duration<_Rep, _Period>& __d) 211 { 212 typedef typename _ToDur::rep __to_rep; 213 return _ToDur(static_cast<__to_rep>( 214 static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den))); 215 } 216 }; 217 218 template<typename _ToDur, typename _CF, typename _CR> 219 struct __duration_cast_impl<_ToDur, _CF, _CR, false, true> 220 { 221 template<typename _Rep, typename _Period> 222 static constexpr _ToDur 223 __cast(const duration<_Rep, _Period>& __d) 224 { 225 typedef typename _ToDur::rep __to_rep; 226 return _ToDur(static_cast<__to_rep>( 227 static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num))); 228 } 229 }; 230 231 template<typename _Tp> 232 struct __is_duration 233 : std::false_type 234 { }; 235 236 template<typename _Rep, typename _Period> 237 struct __is_duration<duration<_Rep, _Period>> 238 : std::true_type 239 { }; 240 241 template<typename _Tp> 242 using __enable_if_is_duration 243 = typename enable_if<__is_duration<_Tp>::value, _Tp>::type; 244 245 template<typename _Tp> 246 using __disable_if_is_duration 247 = typename enable_if<!__is_duration<_Tp>::value, _Tp>::type; 248 249 /// @endcond 250 251 /// duration_cast 252 template<typename _ToDur, typename _Rep, typename _Period> 253 constexpr __enable_if_is_duration<_ToDur> 254 duration_cast(const duration<_Rep, _Period>& __d) 255 { 256 typedef typename _ToDur::period __to_period; 257 typedef typename _ToDur::rep __to_rep; 258 typedef ratio_divide<_Period, __to_period> __cf; 259 typedef typename common_type<__to_rep, _Rep, intmax_t>::type 260 __cr; 261 typedef __duration_cast_impl<_ToDur, __cf, __cr, 262 __cf::num == 1, __cf::den == 1> __dc; 263 return __dc::__cast(__d); 264 } 265 266 /// treat_as_floating_point 267 template<typename _Rep> 268 struct treat_as_floating_point 269 : is_floating_point<_Rep> 270 { }; 271 272 #if __cplusplus > 201402L 273 template <typename _Rep> 274 inline constexpr bool treat_as_floating_point_v = 275 treat_as_floating_point<_Rep>::value; 276 #endif // C++17 277 278 #if __cplusplus > 201703L 279 template<typename _Tp> 280 struct is_clock; 281 282 template<typename _Tp> 283 inline constexpr bool is_clock_v = is_clock<_Tp>::value; 284 285 #if __cpp_lib_concepts 286 template<typename _Tp> 287 struct is_clock : false_type 288 { }; 289 290 template<typename _Tp> 291 requires requires { 292 typename _Tp::rep; 293 typename _Tp::period; 294 typename _Tp::duration; 295 typename _Tp::time_point::clock; 296 typename _Tp::time_point::duration; 297 { &_Tp::is_steady } -> same_as<const bool*>; 298 { _Tp::now() } -> same_as<typename _Tp::time_point>; 299 requires same_as<typename _Tp::duration, 300 duration<typename _Tp::rep, typename _Tp::period>>; 301 requires same_as<typename _Tp::time_point::duration, 302 typename _Tp::duration>; 303 } 304 struct is_clock<_Tp> : true_type 305 { }; 306 #else 307 template<typename _Tp, typename = void> 308 struct __is_clock_impl : false_type 309 { }; 310 311 template<typename _Tp> 312 struct __is_clock_impl<_Tp, 313 void_t<typename _Tp::rep, typename _Tp::period, 314 typename _Tp::duration, 315 typename _Tp::time_point::duration, 316 decltype(_Tp::is_steady), 317 decltype(_Tp::now())>> 318 : __and_<is_same<typename _Tp::duration, 319 duration<typename _Tp::rep, typename _Tp::period>>, 320 is_same<typename _Tp::time_point::duration, 321 typename _Tp::duration>, 322 is_same<decltype(&_Tp::is_steady), const bool*>, 323 is_same<decltype(_Tp::now()), typename _Tp::time_point>>::type 324 { }; 325 326 template<typename _Tp> 327 struct is_clock : __is_clock_impl<_Tp>::type 328 { }; 329 #endif 330 #endif // C++20 331 332 #if __cplusplus >= 201703L 333 # define __cpp_lib_chrono 201611 334 335 template<typename _ToDur, typename _Rep, typename _Period> 336 constexpr __enable_if_is_duration<_ToDur> 337 floor(const duration<_Rep, _Period>& __d) 338 { 339 auto __to = chrono::duration_cast<_ToDur>(__d); 340 if (__to > __d) 341 return __to - _ToDur{1}; 342 return __to; 343 } 344 345 template<typename _ToDur, typename _Rep, typename _Period> 346 constexpr __enable_if_is_duration<_ToDur> 347 ceil(const duration<_Rep, _Period>& __d) 348 { 349 auto __to = chrono::duration_cast<_ToDur>(__d); 350 if (__to < __d) 351 return __to + _ToDur{1}; 352 return __to; 353 } 354 355 template <typename _ToDur, typename _Rep, typename _Period> 356 constexpr enable_if_t< 357 __and_<__is_duration<_ToDur>, 358 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value, 359 _ToDur> 360 round(const duration<_Rep, _Period>& __d) 361 { 362 _ToDur __t0 = chrono::floor<_ToDur>(__d); 363 _ToDur __t1 = __t0 + _ToDur{1}; 364 auto __diff0 = __d - __t0; 365 auto __diff1 = __t1 - __d; 366 if (__diff0 == __diff1) 367 { 368 if (__t0.count() & 1) 369 return __t1; 370 return __t0; 371 } 372 else if (__diff0 < __diff1) 373 return __t0; 374 return __t1; 375 } 376 377 template<typename _Rep, typename _Period> 378 constexpr 379 enable_if_t<numeric_limits<_Rep>::is_signed, duration<_Rep, _Period>> 380 abs(duration<_Rep, _Period> __d) 381 { 382 if (__d >= __d.zero()) 383 return __d; 384 return -__d; 385 } 386 #endif // C++17 387 388 /// duration_values 389 template<typename _Rep> 390 struct duration_values 391 { 392 static constexpr _Rep 393 zero() noexcept 394 { return _Rep(0); } 395 396 static constexpr _Rep 397 max() noexcept 398 { return numeric_limits<_Rep>::max(); } 399 400 static constexpr _Rep 401 min() noexcept 402 { return numeric_limits<_Rep>::lowest(); } 403 }; 404 405 /// @cond undocumented 406 407 template<typename _Tp> 408 struct __is_ratio 409 : std::false_type 410 { }; 411 412 template<intmax_t _Num, intmax_t _Den> 413 struct __is_ratio<ratio<_Num, _Den>> 414 : std::true_type 415 { }; 416 417 /// @endcond 418 419 /// duration 420 template<typename _Rep, typename _Period> 421 struct duration 422 { 423 private: 424 template<typename _Rep2> 425 using __is_float = treat_as_floating_point<_Rep2>; 426 427 static constexpr intmax_t 428 _S_gcd(intmax_t __m, intmax_t __n) noexcept 429 { 430 // Duration only allows positive periods so we don't need to 431 // support negative values here (unlike __static_gcd and std::gcd). 432 return (__m == 0) ? __n : (__n == 0) ? __m : _S_gcd(__n, __m % __n); 433 } 434 435 // _GLIBCXX_RESOLVE_LIB_DEFECTS 436 // 2094. overflow shouldn't participate in overload resolution 437 // 3090. What is [2094] intended to mean? 438 // This only produces a valid type if no overflow occurs. 439 template<typename _R1, typename _R2, 440 intmax_t __gcd1 = _S_gcd(_R1::num, _R2::num), 441 intmax_t __gcd2 = _S_gcd(_R1::den, _R2::den)> 442 using __divide = ratio<(_R1::num / __gcd1) * (_R2::den / __gcd2), 443 (_R1::den / __gcd2) * (_R2::num / __gcd1)>; 444 445 // _Period2 is an exact multiple of _Period 446 template<typename _Period2> 447 using __is_harmonic 448 = __bool_constant<__divide<_Period2, _Period>::den == 1>; 449 450 public: 451 452 using rep = _Rep; 453 using period = typename _Period::type; 454 455 static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration"); 456 static_assert(__is_ratio<_Period>::value, 457 "period must be a specialization of ratio"); 458 static_assert(_Period::num > 0, "period must be positive"); 459 460 // 20.11.5.1 construction / copy / destroy 461 constexpr duration() = default; 462 463 duration(const duration&) = default; 464 465 // _GLIBCXX_RESOLVE_LIB_DEFECTS 466 // 3050. Conversion specification problem in chrono::duration 467 template<typename _Rep2, typename = _Require< 468 is_convertible<const _Rep2&, rep>, 469 __or_<__is_float<rep>, __not_<__is_float<_Rep2>>>>> 470 constexpr explicit duration(const _Rep2& __rep) 471 : __r(static_cast<rep>(__rep)) { } 472 473 template<typename _Rep2, typename _Period2, typename = _Require< 474 is_convertible<const _Rep2&, rep>, 475 __or_<__is_float<rep>, 476 __and_<__is_harmonic<_Period2>, 477 __not_<__is_float<_Rep2>>>>>> 478 constexpr duration(const duration<_Rep2, _Period2>& __d) 479 : __r(duration_cast<duration>(__d).count()) { } 480 481 ~duration() = default; 482 duration& operator=(const duration&) = default; 483 484 // 20.11.5.2 observer 485 constexpr rep 486 count() const 487 { return __r; } 488 489 // 20.11.5.3 arithmetic 490 491 constexpr duration<typename common_type<rep>::type, period> 492 operator+() const 493 { return duration<typename common_type<rep>::type, period>(__r); } 494 495 constexpr duration<typename common_type<rep>::type, period> 496 operator-() const 497 { return duration<typename common_type<rep>::type, period>(-__r); } 498 499 _GLIBCXX17_CONSTEXPR duration& 500 operator++() 501 { 502 ++__r; 503 return *this; 504 } 505 506 _GLIBCXX17_CONSTEXPR duration 507 operator++(int) 508 { return duration(__r++); } 509 510 _GLIBCXX17_CONSTEXPR duration& 511 operator--() 512 { 513 --__r; 514 return *this; 515 } 516 517 _GLIBCXX17_CONSTEXPR duration 518 operator--(int) 519 { return duration(__r--); } 520 521 _GLIBCXX17_CONSTEXPR duration& 522 operator+=(const duration& __d) 523 { 524 __r += __d.count(); 525 return *this; 526 } 527 528 _GLIBCXX17_CONSTEXPR duration& 529 operator-=(const duration& __d) 530 { 531 __r -= __d.count(); 532 return *this; 533 } 534 535 _GLIBCXX17_CONSTEXPR duration& 536 operator*=(const rep& __rhs) 537 { 538 __r *= __rhs; 539 return *this; 540 } 541 542 _GLIBCXX17_CONSTEXPR duration& 543 operator/=(const rep& __rhs) 544 { 545 __r /= __rhs; 546 return *this; 547 } 548 549 // DR 934. 550 template<typename _Rep2 = rep> 551 _GLIBCXX17_CONSTEXPR 552 typename enable_if<!treat_as_floating_point<_Rep2>::value, 553 duration&>::type 554 operator%=(const rep& __rhs) 555 { 556 __r %= __rhs; 557 return *this; 558 } 559 560 template<typename _Rep2 = rep> 561 _GLIBCXX17_CONSTEXPR 562 typename enable_if<!treat_as_floating_point<_Rep2>::value, 563 duration&>::type 564 operator%=(const duration& __d) 565 { 566 __r %= __d.count(); 567 return *this; 568 } 569 570 // 20.11.5.4 special values 571 static constexpr duration 572 zero() noexcept 573 { return duration(duration_values<rep>::zero()); } 574 575 static constexpr duration 576 min() noexcept 577 { return duration(duration_values<rep>::min()); } 578 579 static constexpr duration 580 max() noexcept 581 { return duration(duration_values<rep>::max()); } 582 583 private: 584 rep __r; 585 }; 586 587 /// @relates duration @{ 588 589 /// The sum of two durations. 590 template<typename _Rep1, typename _Period1, 591 typename _Rep2, typename _Period2> 592 constexpr typename common_type<duration<_Rep1, _Period1>, 593 duration<_Rep2, _Period2>>::type 594 operator+(const duration<_Rep1, _Period1>& __lhs, 595 const duration<_Rep2, _Period2>& __rhs) 596 { 597 typedef duration<_Rep1, _Period1> __dur1; 598 typedef duration<_Rep2, _Period2> __dur2; 599 typedef typename common_type<__dur1,__dur2>::type __cd; 600 return __cd(__cd(__lhs).count() + __cd(__rhs).count()); 601 } 602 603 /// The difference between two durations. 604 template<typename _Rep1, typename _Period1, 605 typename _Rep2, typename _Period2> 606 constexpr typename common_type<duration<_Rep1, _Period1>, 607 duration<_Rep2, _Period2>>::type 608 operator-(const duration<_Rep1, _Period1>& __lhs, 609 const duration<_Rep2, _Period2>& __rhs) 610 { 611 typedef duration<_Rep1, _Period1> __dur1; 612 typedef duration<_Rep2, _Period2> __dur2; 613 typedef typename common_type<__dur1,__dur2>::type __cd; 614 return __cd(__cd(__lhs).count() - __cd(__rhs).count()); 615 } 616 617 /// @} 618 619 /// @cond undocumented 620 621 // SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2 622 // is implicitly convertible to it. 623 // _GLIBCXX_RESOLVE_LIB_DEFECTS 624 // 3050. Conversion specification problem in chrono::duration constructor 625 template<typename _Rep1, typename _Rep2, 626 typename _CRep = typename common_type<_Rep1, _Rep2>::type> 627 using __common_rep_t = typename 628 enable_if<is_convertible<const _Rep2&, _CRep>::value, _CRep>::type; 629 630 /// @endcond 631 632 /// @relates duration @{ 633 634 /// Multiply a duration by a scalar value. 635 template<typename _Rep1, typename _Period, typename _Rep2> 636 constexpr duration<__common_rep_t<_Rep1, _Rep2>, _Period> 637 operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s) 638 { 639 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period> 640 __cd; 641 return __cd(__cd(__d).count() * __s); 642 } 643 644 /// Multiply a duration by a scalar value. 645 template<typename _Rep1, typename _Rep2, typename _Period> 646 constexpr duration<__common_rep_t<_Rep2, _Rep1>, _Period> 647 operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d) 648 { return __d * __s; } 649 650 template<typename _Rep1, typename _Period, typename _Rep2> 651 constexpr 652 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period> 653 operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s) 654 { 655 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period> 656 __cd; 657 return __cd(__cd(__d).count() / __s); 658 } 659 660 template<typename _Rep1, typename _Period1, 661 typename _Rep2, typename _Period2> 662 constexpr typename common_type<_Rep1, _Rep2>::type 663 operator/(const duration<_Rep1, _Period1>& __lhs, 664 const duration<_Rep2, _Period2>& __rhs) 665 { 666 typedef duration<_Rep1, _Period1> __dur1; 667 typedef duration<_Rep2, _Period2> __dur2; 668 typedef typename common_type<__dur1,__dur2>::type __cd; 669 return __cd(__lhs).count() / __cd(__rhs).count(); 670 } 671 672 // DR 934. 673 template<typename _Rep1, typename _Period, typename _Rep2> 674 constexpr 675 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period> 676 operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s) 677 { 678 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period> 679 __cd; 680 return __cd(__cd(__d).count() % __s); 681 } 682 683 template<typename _Rep1, typename _Period1, 684 typename _Rep2, typename _Period2> 685 constexpr typename common_type<duration<_Rep1, _Period1>, 686 duration<_Rep2, _Period2>>::type 687 operator%(const duration<_Rep1, _Period1>& __lhs, 688 const duration<_Rep2, _Period2>& __rhs) 689 { 690 typedef duration<_Rep1, _Period1> __dur1; 691 typedef duration<_Rep2, _Period2> __dur2; 692 typedef typename common_type<__dur1,__dur2>::type __cd; 693 return __cd(__cd(__lhs).count() % __cd(__rhs).count()); 694 } 695 696 // comparisons 697 698 template<typename _Rep1, typename _Period1, 699 typename _Rep2, typename _Period2> 700 constexpr bool 701 operator==(const duration<_Rep1, _Period1>& __lhs, 702 const duration<_Rep2, _Period2>& __rhs) 703 { 704 typedef duration<_Rep1, _Period1> __dur1; 705 typedef duration<_Rep2, _Period2> __dur2; 706 typedef typename common_type<__dur1,__dur2>::type __ct; 707 return __ct(__lhs).count() == __ct(__rhs).count(); 708 } 709 710 template<typename _Rep1, typename _Period1, 711 typename _Rep2, typename _Period2> 712 constexpr bool 713 operator<(const duration<_Rep1, _Period1>& __lhs, 714 const duration<_Rep2, _Period2>& __rhs) 715 { 716 typedef duration<_Rep1, _Period1> __dur1; 717 typedef duration<_Rep2, _Period2> __dur2; 718 typedef typename common_type<__dur1,__dur2>::type __ct; 719 return __ct(__lhs).count() < __ct(__rhs).count(); 720 } 721 722 #if __cpp_lib_three_way_comparison 723 template<typename _Rep1, typename _Period1, 724 typename _Rep2, typename _Period2> 725 requires three_way_comparable<common_type_t<_Rep1, _Rep2>> 726 constexpr auto 727 operator<=>(const duration<_Rep1, _Period1>& __lhs, 728 const duration<_Rep2, _Period2>& __rhs) 729 { 730 using __ct = common_type_t<duration<_Rep1, _Period1>, 731 duration<_Rep2, _Period2>>; 732 return __ct(__lhs).count() <=> __ct(__rhs).count(); 733 } 734 #else 735 template<typename _Rep1, typename _Period1, 736 typename _Rep2, typename _Period2> 737 constexpr bool 738 operator!=(const duration<_Rep1, _Period1>& __lhs, 739 const duration<_Rep2, _Period2>& __rhs) 740 { return !(__lhs == __rhs); } 741 #endif 742 743 template<typename _Rep1, typename _Period1, 744 typename _Rep2, typename _Period2> 745 constexpr bool 746 operator<=(const duration<_Rep1, _Period1>& __lhs, 747 const duration<_Rep2, _Period2>& __rhs) 748 { return !(__rhs < __lhs); } 749 750 template<typename _Rep1, typename _Period1, 751 typename _Rep2, typename _Period2> 752 constexpr bool 753 operator>(const duration<_Rep1, _Period1>& __lhs, 754 const duration<_Rep2, _Period2>& __rhs) 755 { return __rhs < __lhs; } 756 757 template<typename _Rep1, typename _Period1, 758 typename _Rep2, typename _Period2> 759 constexpr bool 760 operator>=(const duration<_Rep1, _Period1>& __lhs, 761 const duration<_Rep2, _Period2>& __rhs) 762 { return !(__lhs < __rhs); } 763 764 /// @} 765 766 #ifdef _GLIBCXX_USE_C99_STDINT_TR1 767 # define _GLIBCXX_CHRONO_INT64_T int64_t 768 #elif defined __INT64_TYPE__ 769 # define _GLIBCXX_CHRONO_INT64_T __INT64_TYPE__ 770 #else 771 static_assert(std::numeric_limits<unsigned long long>::digits >= 64, 772 "Representation type for nanoseconds must have at least 64 bits"); 773 # define _GLIBCXX_CHRONO_INT64_T long long 774 #endif 775 776 /// nanoseconds 777 using nanoseconds = duration<_GLIBCXX_CHRONO_INT64_T, nano>; 778 779 /// microseconds 780 using microseconds = duration<_GLIBCXX_CHRONO_INT64_T, micro>; 781 782 /// milliseconds 783 using milliseconds = duration<_GLIBCXX_CHRONO_INT64_T, milli>; 784 785 /// seconds 786 using seconds = duration<_GLIBCXX_CHRONO_INT64_T>; 787 788 /// minutes 789 using minutes = duration<_GLIBCXX_CHRONO_INT64_T, ratio< 60>>; 790 791 /// hours 792 using hours = duration<_GLIBCXX_CHRONO_INT64_T, ratio<3600>>; 793 794 #if __cplusplus > 201703L 795 /// days 796 using days = duration<_GLIBCXX_CHRONO_INT64_T, ratio<86400>>; 797 798 /// weeks 799 using weeks = duration<_GLIBCXX_CHRONO_INT64_T, ratio<604800>>; 800 801 /// years 802 using years = duration<_GLIBCXX_CHRONO_INT64_T, ratio<31556952>>; 803 804 /// months 805 using months = duration<_GLIBCXX_CHRONO_INT64_T, ratio<2629746>>; 806 #endif // C++20 807 808 #undef _GLIBCXX_CHRONO_INT64_T 809 810 /// time_point 811 template<typename _Clock, typename _Dur> 812 struct time_point 813 { 814 static_assert(__is_duration<_Dur>::value, 815 "duration must be a specialization of std::chrono::duration"); 816 817 typedef _Clock clock; 818 typedef _Dur duration; 819 typedef typename duration::rep rep; 820 typedef typename duration::period period; 821 822 constexpr time_point() : __d(duration::zero()) 823 { } 824 825 constexpr explicit time_point(const duration& __dur) 826 : __d(__dur) 827 { } 828 829 // conversions 830 template<typename _Dur2, 831 typename = _Require<is_convertible<_Dur2, _Dur>>> 832 constexpr time_point(const time_point<clock, _Dur2>& __t) 833 : __d(__t.time_since_epoch()) 834 { } 835 836 // observer 837 constexpr duration 838 time_since_epoch() const 839 { return __d; } 840 841 // arithmetic 842 _GLIBCXX17_CONSTEXPR time_point& 843 operator+=(const duration& __dur) 844 { 845 __d += __dur; 846 return *this; 847 } 848 849 _GLIBCXX17_CONSTEXPR time_point& 850 operator-=(const duration& __dur) 851 { 852 __d -= __dur; 853 return *this; 854 } 855 856 // special values 857 static constexpr time_point 858 min() noexcept 859 { return time_point(duration::min()); } 860 861 static constexpr time_point 862 max() noexcept 863 { return time_point(duration::max()); } 864 865 private: 866 duration __d; 867 }; 868 869 /// time_point_cast 870 template<typename _ToDur, typename _Clock, typename _Dur> 871 constexpr typename enable_if<__is_duration<_ToDur>::value, 872 time_point<_Clock, _ToDur>>::type 873 time_point_cast(const time_point<_Clock, _Dur>& __t) 874 { 875 typedef time_point<_Clock, _ToDur> __time_point; 876 return __time_point(duration_cast<_ToDur>(__t.time_since_epoch())); 877 } 878 879 #if __cplusplus > 201402L 880 template<typename _ToDur, typename _Clock, typename _Dur> 881 constexpr 882 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>> 883 floor(const time_point<_Clock, _Dur>& __tp) 884 { 885 return time_point<_Clock, _ToDur>{ 886 chrono::floor<_ToDur>(__tp.time_since_epoch())}; 887 } 888 889 template<typename _ToDur, typename _Clock, typename _Dur> 890 constexpr 891 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>> 892 ceil(const time_point<_Clock, _Dur>& __tp) 893 { 894 return time_point<_Clock, _ToDur>{ 895 chrono::ceil<_ToDur>(__tp.time_since_epoch())}; 896 } 897 898 template<typename _ToDur, typename _Clock, typename _Dur> 899 constexpr enable_if_t< 900 __and_<__is_duration<_ToDur>, 901 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value, 902 time_point<_Clock, _ToDur>> 903 round(const time_point<_Clock, _Dur>& __tp) 904 { 905 return time_point<_Clock, _ToDur>{ 906 chrono::round<_ToDur>(__tp.time_since_epoch())}; 907 } 908 #endif // C++17 909 910 /// @relates time_point @{ 911 912 /// Adjust a time point forwards by the given duration. 913 template<typename _Clock, typename _Dur1, 914 typename _Rep2, typename _Period2> 915 constexpr time_point<_Clock, 916 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type> 917 operator+(const time_point<_Clock, _Dur1>& __lhs, 918 const duration<_Rep2, _Period2>& __rhs) 919 { 920 typedef duration<_Rep2, _Period2> __dur2; 921 typedef typename common_type<_Dur1,__dur2>::type __ct; 922 typedef time_point<_Clock, __ct> __time_point; 923 return __time_point(__lhs.time_since_epoch() + __rhs); 924 } 925 926 /// Adjust a time point forwards by the given duration. 927 template<typename _Rep1, typename _Period1, 928 typename _Clock, typename _Dur2> 929 constexpr time_point<_Clock, 930 typename common_type<duration<_Rep1, _Period1>, _Dur2>::type> 931 operator+(const duration<_Rep1, _Period1>& __lhs, 932 const time_point<_Clock, _Dur2>& __rhs) 933 { 934 typedef duration<_Rep1, _Period1> __dur1; 935 typedef typename common_type<__dur1,_Dur2>::type __ct; 936 typedef time_point<_Clock, __ct> __time_point; 937 return __time_point(__rhs.time_since_epoch() + __lhs); 938 } 939 940 /// Adjust a time point backwards by the given duration. 941 template<typename _Clock, typename _Dur1, 942 typename _Rep2, typename _Period2> 943 constexpr time_point<_Clock, 944 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type> 945 operator-(const time_point<_Clock, _Dur1>& __lhs, 946 const duration<_Rep2, _Period2>& __rhs) 947 { 948 typedef duration<_Rep2, _Period2> __dur2; 949 typedef typename common_type<_Dur1,__dur2>::type __ct; 950 typedef time_point<_Clock, __ct> __time_point; 951 return __time_point(__lhs.time_since_epoch() -__rhs); 952 } 953 954 /// @} 955 956 /// @relates time_point @{ 957 958 /// The difference between two time points (as a duration) 959 template<typename _Clock, typename _Dur1, typename _Dur2> 960 constexpr typename common_type<_Dur1, _Dur2>::type 961 operator-(const time_point<_Clock, _Dur1>& __lhs, 962 const time_point<_Clock, _Dur2>& __rhs) 963 { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); } 964 965 template<typename _Clock, typename _Dur1, typename _Dur2> 966 constexpr bool 967 operator==(const time_point<_Clock, _Dur1>& __lhs, 968 const time_point<_Clock, _Dur2>& __rhs) 969 { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); } 970 971 #if __cpp_lib_three_way_comparison 972 template<typename _Clock, typename _Dur1, 973 three_way_comparable_with<_Dur1> _Dur2> 974 constexpr auto 975 operator<=>(const time_point<_Clock, _Dur1>& __lhs, 976 const time_point<_Clock, _Dur2>& __rhs) 977 { return __lhs.time_since_epoch() <=> __rhs.time_since_epoch(); } 978 #else 979 template<typename _Clock, typename _Dur1, typename _Dur2> 980 constexpr bool 981 operator!=(const time_point<_Clock, _Dur1>& __lhs, 982 const time_point<_Clock, _Dur2>& __rhs) 983 { return !(__lhs == __rhs); } 984 #endif 985 986 template<typename _Clock, typename _Dur1, typename _Dur2> 987 constexpr bool 988 operator<(const time_point<_Clock, _Dur1>& __lhs, 989 const time_point<_Clock, _Dur2>& __rhs) 990 { return __lhs.time_since_epoch() < __rhs.time_since_epoch(); } 991 992 template<typename _Clock, typename _Dur1, typename _Dur2> 993 constexpr bool 994 operator<=(const time_point<_Clock, _Dur1>& __lhs, 995 const time_point<_Clock, _Dur2>& __rhs) 996 { return !(__rhs < __lhs); } 997 998 template<typename _Clock, typename _Dur1, typename _Dur2> 999 constexpr bool 1000 operator>(const time_point<_Clock, _Dur1>& __lhs, 1001 const time_point<_Clock, _Dur2>& __rhs) 1002 { return __rhs < __lhs; } 1003 1004 template<typename _Clock, typename _Dur1, typename _Dur2> 1005 constexpr bool 1006 operator>=(const time_point<_Clock, _Dur1>& __lhs, 1007 const time_point<_Clock, _Dur2>& __rhs) 1008 { return !(__lhs < __rhs); } 1009 1010 /// @} 1011 1012 // Clocks. 1013 1014 // Why nanosecond resolution as the default? 1015 // Why have std::system_clock always count in the highest 1016 // resolution (ie nanoseconds), even if on some OSes the low 3 1017 // or 9 decimal digits will be always zero? This allows later 1018 // implementations to change the system_clock::now() 1019 // implementation any time to provide better resolution without 1020 // changing function signature or units. 1021 1022 // To support the (forward) evolution of the library's defined 1023 // clocks, wrap inside inline namespace so that the current 1024 // defintions of system_clock, steady_clock, and 1025 // high_resolution_clock types are uniquely mangled. This way, new 1026 // code can use the latests clocks, while the library can contain 1027 // compatibility definitions for previous versions. At some 1028 // point, when these clocks settle down, the inlined namespaces 1029 // can be removed. XXX GLIBCXX_ABI Deprecated 1030 inline namespace _V2 { 1031 1032 /** 1033 * @brief System clock. 1034 * 1035 * Time returned represents wall time from the system-wide clock. 1036 * @ingroup chrono 1037 */ 1038 struct system_clock 1039 { 1040 typedef chrono::nanoseconds duration; 1041 typedef duration::rep rep; 1042 typedef duration::period period; 1043 typedef chrono::time_point<system_clock, duration> time_point; 1044 1045 static_assert(system_clock::duration::min() 1046 < system_clock::duration::zero(), 1047 "a clock's minimum duration cannot be less than its epoch"); 1048 1049 static constexpr bool is_steady = false; 1050 1051 static time_point 1052 now() noexcept; 1053 1054 // Map to C API 1055 static std::time_t 1056 to_time_t(const time_point& __t) noexcept 1057 { 1058 return std::time_t(duration_cast<chrono::seconds> 1059 (__t.time_since_epoch()).count()); 1060 } 1061 1062 static time_point 1063 from_time_t(std::time_t __t) noexcept 1064 { 1065 typedef chrono::time_point<system_clock, seconds> __from; 1066 return time_point_cast<system_clock::duration> 1067 (__from(chrono::seconds(__t))); 1068 } 1069 }; 1070 1071 1072 /** 1073 * @brief Monotonic clock 1074 * 1075 * Time returned has the property of only increasing at a uniform rate. 1076 * @ingroup chrono 1077 */ 1078 struct steady_clock 1079 { 1080 typedef chrono::nanoseconds duration; 1081 typedef duration::rep rep; 1082 typedef duration::period period; 1083 typedef chrono::time_point<steady_clock, duration> time_point; 1084 1085 static constexpr bool is_steady = true; 1086 1087 static time_point 1088 now() noexcept; 1089 }; 1090 1091 1092 /** 1093 * @brief Highest-resolution clock 1094 * 1095 * This is the clock "with the shortest tick period." Alias to 1096 * std::system_clock until higher-than-nanosecond definitions 1097 * become feasible. 1098 * @ingroup chrono 1099 */ 1100 using high_resolution_clock = system_clock; 1101 1102 } // end inline namespace _V2 1103 1104 #if __cplusplus > 201703L 1105 template<typename _Duration> 1106 using sys_time = time_point<system_clock, _Duration>; 1107 using sys_seconds = sys_time<seconds>; 1108 using sys_days = sys_time<days>; 1109 1110 using file_clock = ::std::filesystem::__file_clock; 1111 1112 template<typename _Duration> 1113 using file_time = time_point<file_clock, _Duration>; 1114 1115 template<> struct is_clock<system_clock> : true_type { }; 1116 template<> struct is_clock<steady_clock> : true_type { }; 1117 template<> struct is_clock<file_clock> : true_type { }; 1118 1119 template<> inline constexpr bool is_clock_v<system_clock> = true; 1120 template<> inline constexpr bool is_clock_v<steady_clock> = true; 1121 template<> inline constexpr bool is_clock_v<file_clock> = true; 1122 1123 struct local_t { }; 1124 template<typename _Duration> 1125 using local_time = time_point<local_t, _Duration>; 1126 using local_seconds = local_time<seconds>; 1127 using local_days = local_time<days>; 1128 #endif // C++20 1129 1130 /// @} 1131 } // namespace chrono 1132 1133 #if __cplusplus > 201103L 1134 1135 #define __cpp_lib_chrono_udls 201304 1136 1137 inline namespace literals 1138 { 1139 /** ISO C++ 2014 namespace for suffixes for duration literals. 1140 * 1141 * These suffixes can be used to create `chrono::duration` values with 1142 * tick periods of hours, minutes, seconds, milliseconds, microseconds 1143 * or nanoseconds. For example, `std::chrono::seconds(5)` can be written 1144 * as `5s` after making the suffix visible in the current scope. 1145 * The suffixes can be made visible by a using-directive or 1146 * using-declaration such as: 1147 * - `using namespace std::chrono_literals;` 1148 * - `using namespace std::literals;` 1149 * - `using namespace std::chrono;` 1150 * - `using namespace std;` 1151 * - `using std::chrono_literals::operator""s;` 1152 * 1153 * The result of these suffixes on an integer literal is one of the 1154 * standard typedefs such as `std::chrono::hours`. 1155 * The result on a floating-point literal is a duration type with the 1156 * specified tick period and an unspecified floating-point representation, 1157 * for example `1.5e2ms` might be equivalent to 1158 * `chrono::duration<long double, chrono::milli>(1.5e2)`. 1159 * 1160 * @ingroup chrono 1161 */ 1162 inline namespace chrono_literals 1163 { 1164 #pragma GCC diagnostic push 1165 #pragma GCC diagnostic ignored "-Wliteral-suffix" 1166 /// @cond undocumented 1167 template<typename _Dur, char... _Digits> 1168 constexpr _Dur __check_overflow() 1169 { 1170 using _Val = __parse_int::_Parse_int<_Digits...>; 1171 constexpr typename _Dur::rep __repval = _Val::value; 1172 static_assert(__repval >= 0 && __repval == _Val::value, 1173 "literal value cannot be represented by duration type"); 1174 return _Dur(__repval); 1175 } 1176 /// @endcond 1177 1178 /// Literal suffix for durations representing non-integer hours 1179 constexpr chrono::duration<long double, ratio<3600,1>> 1180 operator""h(long double __hours) 1181 { return chrono::duration<long double, ratio<3600,1>>{__hours}; } 1182 1183 /// Literal suffix for durations of type `std::chrono::hours` 1184 template <char... _Digits> 1185 constexpr chrono::hours 1186 operator""h() 1187 { return __check_overflow<chrono::hours, _Digits...>(); } 1188 1189 /// Literal suffix for durations representing non-integer minutes 1190 constexpr chrono::duration<long double, ratio<60,1>> 1191 operator""min(long double __mins) 1192 { return chrono::duration<long double, ratio<60,1>>{__mins}; } 1193 1194 /// Literal suffix for durations of type `std::chrono::minutes` 1195 template <char... _Digits> 1196 constexpr chrono::minutes 1197 operator""min() 1198 { return __check_overflow<chrono::minutes, _Digits...>(); } 1199 1200 /// Literal suffix for durations representing non-integer seconds 1201 constexpr chrono::duration<long double> 1202 operator""s(long double __secs) 1203 { return chrono::duration<long double>{__secs}; } 1204 1205 /// Literal suffix for durations of type `std::chrono::seconds` 1206 template <char... _Digits> 1207 constexpr chrono::seconds 1208 operator""s() 1209 { return __check_overflow<chrono::seconds, _Digits...>(); } 1210 1211 /// Literal suffix for durations representing non-integer milliseconds 1212 constexpr chrono::duration<long double, milli> 1213 operator""ms(long double __msecs) 1214 { return chrono::duration<long double, milli>{__msecs}; } 1215 1216 /// Literal suffix for durations of type `std::chrono::milliseconds` 1217 template <char... _Digits> 1218 constexpr chrono::milliseconds 1219 operator""ms() 1220 { return __check_overflow<chrono::milliseconds, _Digits...>(); } 1221 1222 /// Literal suffix for durations representing non-integer microseconds 1223 constexpr chrono::duration<long double, micro> 1224 operator""us(long double __usecs) 1225 { return chrono::duration<long double, micro>{__usecs}; } 1226 1227 /// Literal suffix for durations of type `std::chrono::microseconds` 1228 template <char... _Digits> 1229 constexpr chrono::microseconds 1230 operator""us() 1231 { return __check_overflow<chrono::microseconds, _Digits...>(); } 1232 1233 /// Literal suffix for durations representing non-integer nanoseconds 1234 constexpr chrono::duration<long double, nano> 1235 operator""ns(long double __nsecs) 1236 { return chrono::duration<long double, nano>{__nsecs}; } 1237 1238 /// Literal suffix for durations of type `std::chrono::nanoseconds` 1239 template <char... _Digits> 1240 constexpr chrono::nanoseconds 1241 operator""ns() 1242 { return __check_overflow<chrono::nanoseconds, _Digits...>(); } 1243 1244 #pragma GCC diagnostic pop 1245 } // inline namespace chrono_literals 1246 } // inline namespace literals 1247 1248 namespace chrono 1249 { 1250 using namespace literals::chrono_literals; 1251 } // namespace chrono 1252 1253 #if __cplusplus >= 201703L 1254 namespace filesystem 1255 { 1256 struct __file_clock 1257 { 1258 using duration = chrono::nanoseconds; 1259 using rep = duration::rep; 1260 using period = duration::period; 1261 using time_point = chrono::time_point<__file_clock>; 1262 static constexpr bool is_steady = false; 1263 1264 static time_point 1265 now() noexcept 1266 { return _S_from_sys(chrono::system_clock::now()); } 1267 1268 #if __cplusplus > 201703L 1269 template<typename _Dur> 1270 static 1271 chrono::file_time<_Dur> 1272 from_sys(const chrono::sys_time<_Dur>& __t) noexcept 1273 { return _S_from_sys(__t); } 1274 1275 // For internal use only 1276 template<typename _Dur> 1277 static 1278 chrono::sys_time<_Dur> 1279 to_sys(const chrono::file_time<_Dur>& __t) noexcept 1280 { return _S_to_sys(__t); } 1281 #endif // C++20 1282 1283 private: 1284 using __sys_clock = chrono::system_clock; 1285 1286 // This clock's (unspecified) epoch is 2174-01-01 00:00:00 UTC. 1287 // A signed 64-bit duration with nanosecond resolution gives roughly 1288 // +/- 292 years, which covers the 1901-2446 date range for ext4. 1289 static constexpr chrono::seconds _S_epoch_diff{6437664000}; 1290 1291 protected: 1292 // For internal use only 1293 template<typename _Dur> 1294 static 1295 chrono::time_point<__file_clock, _Dur> 1296 _S_from_sys(const chrono::time_point<__sys_clock, _Dur>& __t) noexcept 1297 { 1298 using __file_time = chrono::time_point<__file_clock, _Dur>; 1299 return __file_time{__t.time_since_epoch()} - _S_epoch_diff; 1300 } 1301 1302 // For internal use only 1303 template<typename _Dur> 1304 static 1305 chrono::time_point<__sys_clock, _Dur> 1306 _S_to_sys(const chrono::time_point<__file_clock, _Dur>& __t) noexcept 1307 { 1308 using __sys_time = chrono::time_point<__sys_clock, _Dur>; 1309 return __sys_time{__t.time_since_epoch()} + _S_epoch_diff; 1310 } 1311 }; 1312 } // namespace filesystem 1313 #endif // C++17 1314 #endif // C++14 1315 1316 _GLIBCXX_END_NAMESPACE_VERSION 1317 } // namespace std 1318 1319 #endif // C++11 1320 1321 #endif //_GLIBCXX_CHRONO 1322
Indexes created Mon Mar 02 05:31:46 UTC 2026