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_YEAR_H
11 #define _LIBCPP___CHRONO_YEAR_H
12 
13 #include <__chrono/duration.h>
14 #include <__config>
15 #include <compare>
16 #include <limits>
17 
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 #  pragma GCC system_header
20 #endif
21 
22 _LIBCPP_PUSH_MACROS
23 #include <__undef_macros>
24 
25 #if _LIBCPP_STD_VER >= 20
26 
27 _LIBCPP_BEGIN_NAMESPACE_STD
28 
29 namespace chrono {
30 
31 class year {
32 private:
33   short __y_;
34 
35 public:
36   year() = default;
37   _LIBCPP_HIDE_FROM_ABI explicit inline constexpr year(int __val) noexcept : __y_(static_cast<short>(__val)) {}
38 
39   _LIBCPP_HIDE_FROM_ABI inline constexpr year& operator++() noexcept {
40     ++__y_;
41     return *this;
42   }
43   _LIBCPP_HIDE_FROM_ABI inline constexpr year operator++(int) noexcept {
44     year __tmp = *this;
45     ++(*this);
46     return __tmp;
47   }
48   _LIBCPP_HIDE_FROM_ABI inline constexpr year& operator--() noexcept {
49     --__y_;
50     return *this;
51   }
52   _LIBCPP_HIDE_FROM_ABI inline constexpr year operator--(int) noexcept {
53     year __tmp = *this;
54     --(*this);
55     return __tmp;
56   }
57   _LIBCPP_HIDE_FROM_ABI constexpr year& operator+=(const years& __dy) noexcept;
58   _LIBCPP_HIDE_FROM_ABI constexpr year& operator-=(const years& __dy) noexcept;
59   _LIBCPP_HIDE_FROM_ABI inline constexpr year operator+() const noexcept { return *this; }
60   _LIBCPP_HIDE_FROM_ABI inline constexpr year operator-() const noexcept { return year{-__y_}; }
61 
62   _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_leap() const noexcept {
63     return __y_ % 4 == 0 && (__y_ % 100 != 0 || __y_ % 400 == 0);
64   }
65   _LIBCPP_HIDE_FROM_ABI explicit inline constexpr operator int() const noexcept { return __y_; }
66   _LIBCPP_HIDE_FROM_ABI constexpr bool ok() const noexcept;
67   _LIBCPP_HIDE_FROM_ABI static inline constexpr year min() noexcept { return year{-32767}; }
68   _LIBCPP_HIDE_FROM_ABI static inline constexpr year max() noexcept { return year{32767}; }
69 };
70 
71 _LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const year& __lhs, const year& __rhs) noexcept {
72   return static_cast<int>(__lhs) == static_cast<int>(__rhs);
73 }
74 
75 _LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(const year& __lhs, const year& __rhs) noexcept {
76   return static_cast<int>(__lhs) <=> static_cast<int>(__rhs);
77 }
78 
79 _LIBCPP_HIDE_FROM_ABI inline constexpr year operator+(const year& __lhs, const years& __rhs) noexcept {
80   return year(static_cast<int>(__lhs) + __rhs.count());
81 }
82 
83 _LIBCPP_HIDE_FROM_ABI inline constexpr year operator+(const years& __lhs, const year& __rhs) noexcept {
84   return __rhs + __lhs;
85 }
86 
87 _LIBCPP_HIDE_FROM_ABI inline constexpr year operator-(const year& __lhs, const years& __rhs) noexcept {
88   return __lhs + -__rhs;
89 }
90 
91 _LIBCPP_HIDE_FROM_ABI inline constexpr years operator-(const year& __lhs, const year& __rhs) noexcept {
92   return years{static_cast<int>(__lhs) - static_cast<int>(__rhs)};
93 }
94 
95 _LIBCPP_HIDE_FROM_ABI inline constexpr year& year::operator+=(const years& __dy) noexcept {
96   *this = *this + __dy;
97   return *this;
98 }
99 
100 _LIBCPP_HIDE_FROM_ABI inline constexpr year& year::operator-=(const years& __dy) noexcept {
101   *this = *this - __dy;
102   return *this;
103 }
104 
105 _LIBCPP_HIDE_FROM_ABI constexpr bool year::ok() const noexcept {
106   static_assert(static_cast<int>(std::numeric_limits<decltype(__y_)>::max()) == static_cast<int>(max()));
107   return static_cast<int>(min()) <= __y_;
108 }
109 
110 } // namespace chrono
111 
112 _LIBCPP_END_NAMESPACE_STD
113 
114 #endif // _LIBCPP_STD_VER >= 20
115 
116 _LIBCPP_POP_MACROS
117 
118 #endif // _LIBCPP___CHRONO_YEAR_H
119