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#ifndef _LIBCPP___CHRONO_WEEKDAY_H
11#define _LIBCPP___CHRONO_WEEKDAY_H
12
13#include <__chrono/calendar.h>
14#include <__chrono/duration.h>
15#include <__chrono/system_clock.h>
16#include <__chrono/time_point.h>
17#include <__config>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20# pragma GCC system_header
21#endif
22
23#if _LIBCPP_STD_VER >= 20
24
25_LIBCPP_BEGIN_NAMESPACE_STD
26
27namespace chrono {
28
29class weekday_indexed;
30class weekday_last;
31
32class weekday {
33private:
34 unsigned char __wd_;
35 _LIBCPP_HIDE_FROM_ABI static constexpr unsigned char __weekday_from_days(int __days) noexcept;
36
37public:
38 weekday() = default;
39 _LIBCPP_HIDE_FROM_ABI inline explicit constexpr weekday(unsigned __val) noexcept
40 : __wd_(static_cast<unsigned char>(__val == 7 ? 0 : __val)) {}
41 _LIBCPP_HIDE_FROM_ABI inline constexpr weekday(const sys_days& __sysd) noexcept
42 : __wd_(__weekday_from_days(days: __sysd.time_since_epoch().count())) {}
43 _LIBCPP_HIDE_FROM_ABI inline explicit constexpr weekday(const local_days& __locd) noexcept
44 : __wd_(__weekday_from_days(days: __locd.time_since_epoch().count())) {}
45
46 _LIBCPP_HIDE_FROM_ABI inline constexpr weekday& operator++() noexcept {
47 __wd_ = (__wd_ == 6 ? 0 : __wd_ + 1);
48 return *this;
49 }
50 _LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator++(int) noexcept {
51 weekday __tmp = *this;
52 ++(*this);
53 return __tmp;
54 }
55 _LIBCPP_HIDE_FROM_ABI inline constexpr weekday& operator--() noexcept {
56 __wd_ = (__wd_ == 0 ? 6 : __wd_ - 1);
57 return *this;
58 }
59 _LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator--(int) noexcept {
60 weekday __tmp = *this;
61 --(*this);
62 return __tmp;
63 }
64 _LIBCPP_HIDE_FROM_ABI constexpr weekday& operator+=(const days& __dd) noexcept;
65 _LIBCPP_HIDE_FROM_ABI constexpr weekday& operator-=(const days& __dd) noexcept;
66 _LIBCPP_HIDE_FROM_ABI inline constexpr unsigned c_encoding() const noexcept { return __wd_; }
67 _LIBCPP_HIDE_FROM_ABI inline constexpr unsigned iso_encoding() const noexcept { return __wd_ == 0u ? 7 : __wd_; }
68 _LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __wd_ <= 6; }
69 _LIBCPP_HIDE_FROM_ABI constexpr weekday_indexed operator[](unsigned __index) const noexcept;
70 _LIBCPP_HIDE_FROM_ABI constexpr weekday_last operator[](last_spec) const noexcept;
71};
72
73// https://howardhinnant.github.io/date_algorithms.html#weekday_from_days
74_LIBCPP_HIDE_FROM_ABI inline constexpr unsigned char weekday::__weekday_from_days(int __days) noexcept {
75 return static_cast<unsigned char>(static_cast<unsigned>(__days >= -4 ? (__days + 4) % 7 : (__days + 5) % 7 + 6));
76}
77
78_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const weekday& __lhs, const weekday& __rhs) noexcept {
79 return __lhs.c_encoding() == __rhs.c_encoding();
80}
81
82_LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator+(const weekday& __lhs, const days& __rhs) noexcept {
83 auto const __mu = static_cast<long long>(__lhs.c_encoding()) + __rhs.count();
84 auto const __yr = (__mu >= 0 ? __mu : __mu - 6) / 7;
85 return weekday{static_cast<unsigned>(__mu - __yr * 7)};
86}
87
88_LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator+(const days& __lhs, const weekday& __rhs) noexcept {
89 return __rhs + __lhs;
90}
91
92_LIBCPP_HIDE_FROM_ABI inline constexpr weekday operator-(const weekday& __lhs, const days& __rhs) noexcept {
93 return __lhs + -__rhs;
94}
95
96_LIBCPP_HIDE_FROM_ABI inline constexpr days operator-(const weekday& __lhs, const weekday& __rhs) noexcept {
97 const int __wdu = __lhs.c_encoding() - __rhs.c_encoding();
98 const int __wk = (__wdu >= 0 ? __wdu : __wdu - 6) / 7;
99 return days{__wdu - __wk * 7};
100}
101
102_LIBCPP_HIDE_FROM_ABI inline constexpr weekday& weekday::operator+=(const days& __dd) noexcept {
103 *this = *this + __dd;
104 return *this;
105}
106
107_LIBCPP_HIDE_FROM_ABI inline constexpr weekday& weekday::operator-=(const days& __dd) noexcept {
108 *this = *this - __dd;
109 return *this;
110}
111
112class weekday_indexed {
113private:
114 chrono::weekday __wd_;
115 unsigned char __idx_;
116
117public:
118 weekday_indexed() = default;
119 _LIBCPP_HIDE_FROM_ABI inline constexpr weekday_indexed(const chrono::weekday& __wdval, unsigned __idxval) noexcept
120 : __wd_{__wdval}, __idx_(__idxval) {}
121 _LIBCPP_HIDE_FROM_ABI inline constexpr chrono::weekday weekday() const noexcept { return __wd_; }
122 _LIBCPP_HIDE_FROM_ABI inline constexpr unsigned index() const noexcept { return __idx_; }
123 _LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __wd_.ok() && __idx_ >= 1 && __idx_ <= 5; }
124};
125
126_LIBCPP_HIDE_FROM_ABI inline constexpr bool
127operator==(const weekday_indexed& __lhs, const weekday_indexed& __rhs) noexcept {
128 return __lhs.weekday() == __rhs.weekday() && __lhs.index() == __rhs.index();
129}
130
131class weekday_last {
132private:
133 chrono::weekday __wd_;
134
135public:
136 _LIBCPP_HIDE_FROM_ABI explicit constexpr weekday_last(const chrono::weekday& __val) noexcept : __wd_{__val} {}
137 _LIBCPP_HIDE_FROM_ABI constexpr chrono::weekday weekday() const noexcept { return __wd_; }
138 _LIBCPP_HIDE_FROM_ABI constexpr bool ok() const noexcept { return __wd_.ok(); }
139};
140
141_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const weekday_last& __lhs, const weekday_last& __rhs) noexcept {
142 return __lhs.weekday() == __rhs.weekday();
143}
144
145_LIBCPP_HIDE_FROM_ABI inline constexpr weekday_indexed weekday::operator[](unsigned __index) const noexcept {
146 return weekday_indexed{*this, __index};
147}
148
149_LIBCPP_HIDE_FROM_ABI inline constexpr weekday_last weekday::operator[](last_spec) const noexcept {
150 return weekday_last{*this};
151}
152
153inline constexpr weekday Sunday{0};
154inline constexpr weekday Monday{1};
155inline constexpr weekday Tuesday{2};
156inline constexpr weekday Wednesday{3};
157inline constexpr weekday Thursday{4};
158inline constexpr weekday Friday{5};
159inline constexpr weekday Saturday{6};
160
161} // namespace chrono
162
163_LIBCPP_END_NAMESPACE_STD
164
165#endif // _LIBCPP_STD_VER >= 20
166
167#endif // _LIBCPP___CHRONO_WEEKDAY_H
168