1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
11
12#ifndef _LIBCPP___CHRONO_LEAP_SECOND_H
13#define _LIBCPP___CHRONO_LEAP_SECOND_H
14
15#include <version>
16// Enable the contents of the header only when libc++ was built with experimental features enabled.
17#if !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
18
19# include <__chrono/duration.h>
20# include <__chrono/system_clock.h>
21# include <__chrono/time_point.h>
22# include <__compare/ordering.h>
23# include <__compare/three_way_comparable.h>
24# include <__config>
25# include <__utility/private_constructor_tag.h>
26
27# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28# pragma GCC system_header
29# endif
30
31_LIBCPP_BEGIN_NAMESPACE_STD
32
33# if _LIBCPP_STD_VER >= 20
34
35namespace chrono {
36
37class leap_second {
38public:
39 [[nodiscard]]
40 _LIBCPP_HIDE_FROM_ABI explicit constexpr leap_second(__private_constructor_tag, sys_seconds __date, seconds __value)
41 : __date_(__date), __value_(__value) {}
42
43 _LIBCPP_HIDE_FROM_ABI leap_second(const leap_second&) = default;
44 _LIBCPP_HIDE_FROM_ABI leap_second& operator=(const leap_second&) = default;
45
46 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI constexpr sys_seconds date() const noexcept { return __date_; }
47
48 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI constexpr seconds value() const noexcept { return __value_; }
49
50private:
51 sys_seconds __date_;
52 seconds __value_;
53};
54
55_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const leap_second& __x, const leap_second& __y) {
56 return __x.date() == __y.date();
57}
58
59_LIBCPP_HIDE_FROM_ABI inline constexpr strong_ordering operator<=>(const leap_second& __x, const leap_second& __y) {
60 return __x.date() <=> __y.date();
61}
62
63template <class _Duration>
64_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const leap_second& __x, const sys_time<_Duration>& __y) {
65 return __x.date() == __y;
66}
67
68template <class _Duration>
69_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const leap_second& __x, const sys_time<_Duration>& __y) {
70 return __x.date() < __y;
71}
72
73template <class _Duration>
74_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const sys_time<_Duration>& __x, const leap_second& __y) {
75 return __x < __y.date();
76}
77
78template <class _Duration>
79_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const leap_second& __x, const sys_time<_Duration>& __y) {
80 return __y < __x;
81}
82
83template <class _Duration>
84_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const sys_time<_Duration>& __x, const leap_second& __y) {
85 return __y < __x;
86}
87
88template <class _Duration>
89_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const leap_second& __x, const sys_time<_Duration>& __y) {
90 return !(__y < __x);
91}
92
93template <class _Duration>
94_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const sys_time<_Duration>& __x, const leap_second& __y) {
95 return !(__y < __x);
96}
97
98template <class _Duration>
99_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const leap_second& __x, const sys_time<_Duration>& __y) {
100 return !(__x < __y);
101}
102
103template <class _Duration>
104_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const sys_time<_Duration>& __x, const leap_second& __y) {
105 return !(__x < __y);
106}
107
108# ifndef _LIBCPP_COMPILER_GCC
109// This requirement cause a compilation loop in GCC-13 and running out of memory.
110// TODO TZDB Test whether GCC-14 fixes this.
111template <class _Duration>
112 requires three_way_comparable_with<sys_seconds, sys_time<_Duration>>
113_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const leap_second& __x, const sys_time<_Duration>& __y) {
114 return __x.date() <=> __y;
115}
116# endif
117
118} // namespace chrono
119
120# endif //_LIBCPP_STD_VER >= 20
121
122_LIBCPP_END_NAMESPACE_STD
123
124#endif // !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
125
126#endif // _LIBCPP___CHRONO_LEAP_SECOND_H
127