__cxx03/__chrono/leap_second.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 // For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
0011
0012 #ifndef _LIBCPP___CXX03___CHRONO_LEAP_SECOND_H
0013 #define _LIBCPP___CXX03___CHRONO_LEAP_SECOND_H
0014
0015 #include <__cxx03/version>
0016 // Enable the contents of the header only when libc++ was built with experimental features enabled.
0017 #if !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
0018
0019 #  include <__cxx03/__chrono/duration.h>
0020 #  include <__cxx03/__chrono/system_clock.h>
0021 #  include <__cxx03/__chrono/time_point.h>
0022 #  include <__cxx03/__compare/ordering.h>
0023 #  include <__cxx03/__compare/three_way_comparable.h>
0024 #  include <__cxx03/__config>
0025 #  include <__cxx03/__utility/private_constructor_tag.h>
0026
0027 #  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0028 #    pragma GCC system_header
0029 #  endif
0030
0031 _LIBCPP_BEGIN_NAMESPACE_STD
0032
0033 #  if _LIBCPP_STD_VER >= 20
0034
0035 namespace chrono {
0036
0037 class leap_second {
0038 public:
0039   [[nodiscard]]
0040   _LIBCPP_HIDE_FROM_ABI explicit constexpr leap_second(__private_constructor_tag, sys_seconds __date, seconds __value)
0041       : __date_(__date), __value_(__value) {}
0042
0043   _LIBCPP_HIDE_FROM_ABI leap_second(const leap_second&)            = default;
0044   _LIBCPP_HIDE_FROM_ABI leap_second& operator=(const leap_second&) = default;
0045
0046   _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI constexpr sys_seconds date() const noexcept { return __date_; }
0047
0048   _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI constexpr seconds value() const noexcept { return __value_; }
0049
0050 private:
0051   sys_seconds __date_;
0052   seconds __value_;
0053 };
0054
0055 _LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const leap_second& __x, const leap_second& __y) {
0056   return __x.date() == __y.date();
0057 }
0058
0059 _LIBCPP_HIDE_FROM_ABI inline constexpr strong_ordering operator<=>(const leap_second& __x, const leap_second& __y) {
0060   return __x.date() <=> __y.date();
0061 }
0062
0063 template <class _Duration>
0064 _LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const leap_second& __x, const sys_time<_Duration>& __y) {
0065   return __x.date() == __y;
0066 }
0067
0068 template <class _Duration>
0069 _LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const leap_second& __x, const sys_time<_Duration>& __y) {
0070   return __x.date() < __y;
0071 }
0072
0073 template <class _Duration>
0074 _LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const sys_time<_Duration>& __x, const leap_second& __y) {
0075   return __x < __y.date();
0076 }
0077
0078 template <class _Duration>
0079 _LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const leap_second& __x, const sys_time<_Duration>& __y) {
0080   return __y < __x;
0081 }
0082
0083 template <class _Duration>
0084 _LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const sys_time<_Duration>& __x, const leap_second& __y) {
0085   return __y < __x;
0086 }
0087
0088 template <class _Duration>
0089 _LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const leap_second& __x, const sys_time<_Duration>& __y) {
0090   return !(__y < __x);
0091 }
0092
0093 template <class _Duration>
0094 _LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const sys_time<_Duration>& __x, const leap_second& __y) {
0095   return !(__y < __x);
0096 }
0097
0098 template <class _Duration>
0099 _LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const leap_second& __x, const sys_time<_Duration>& __y) {
0100   return !(__x < __y);
0101 }
0102
0103 template <class _Duration>
0104 _LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const sys_time<_Duration>& __x, const leap_second& __y) {
0105   return !(__x < __y);
0106 }
0107
0108 #    ifndef _LIBCPP_COMPILER_GCC
0109 // This requirement cause a compilation loop in GCC-13 and running out of memory.
0110 // TODO TZDB Test whether GCC-14 fixes this.
0111 template <class _Duration>
0112   requires three_way_comparable_with<sys_seconds, sys_time<_Duration>>
0113 _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const leap_second& __x, const sys_time<_Duration>& __y) {
0114   return __x.date() <=> __y;
0115 }
0116 #    endif
0117
0118 } // namespace chrono
0119
0120 #  endif //_LIBCPP_STD_VER >= 20
0121
0122 _LIBCPP_END_NAMESPACE_STD
0123
0124 #endif // !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
0125
0126 #endif // _LIBCPP___CXX03___CHRONO_LEAP_SECOND_H