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_MONTH_H
11 #define _LIBCPP___CHRONO_MONTH_H
12 
13 #include <__chrono/duration.h>
14 #include <__config>
15 #include <compare>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 #if _LIBCPP_STD_VER >= 20
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 namespace chrono
26 {
27 
28 class month {
29 private:
30     unsigned char __m_;
31 public:
32     month() = default;
33     _LIBCPP_HIDE_FROM_ABI explicit inline constexpr month(unsigned __val) noexcept : __m_(static_cast<unsigned char>(__val)) {}
34     _LIBCPP_HIDE_FROM_ABI inline constexpr month& operator++()    noexcept { *this += months{1}; return *this; }
35     _LIBCPP_HIDE_FROM_ABI inline constexpr month  operator++(int) noexcept { month __tmp = *this; ++(*this); return __tmp; }
36     _LIBCPP_HIDE_FROM_ABI inline constexpr month& operator--()    noexcept { *this -= months{1}; return *this; }
37     _LIBCPP_HIDE_FROM_ABI inline constexpr month  operator--(int) noexcept { month __tmp = *this; --(*this); return __tmp; }
38     _LIBCPP_HIDE_FROM_ABI        constexpr month& operator+=(const months& __m1) noexcept;
39     _LIBCPP_HIDE_FROM_ABI        constexpr month& operator-=(const months& __m1) noexcept;
40     _LIBCPP_HIDE_FROM_ABI explicit inline constexpr operator unsigned() const noexcept { return __m_; }
41     _LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __m_ >= 1 && __m_ <= 12; }
42 };
43 
44 
45 _LIBCPP_HIDE_FROM_ABI inline constexpr
46 bool operator==(const month& __lhs, const month& __rhs) noexcept
47 { return static_cast<unsigned>(__lhs) == static_cast<unsigned>(__rhs); }
48 
49 _LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(const month& __lhs, const month& __rhs) noexcept {
50     return static_cast<unsigned>(__lhs) <=> static_cast<unsigned>(__rhs);
51 }
52 
53 _LIBCPP_HIDE_FROM_ABI inline constexpr
54 month operator+ (const month& __lhs, const months& __rhs) noexcept
55 {
56     auto const __mu = static_cast<long long>(static_cast<unsigned>(__lhs)) + (__rhs.count() - 1);
57     auto const __yr = (__mu >= 0 ? __mu : __mu - 11) / 12;
58     return month{static_cast<unsigned>(__mu - __yr * 12 + 1)};
59 }
60 
61 _LIBCPP_HIDE_FROM_ABI inline constexpr
62 month operator+ (const months& __lhs, const month& __rhs) noexcept
63 { return __rhs + __lhs; }
64 
65 _LIBCPP_HIDE_FROM_ABI inline constexpr
66 month operator- (const month& __lhs, const months& __rhs) noexcept
67 { return __lhs + -__rhs; }
68 
69 _LIBCPP_HIDE_FROM_ABI inline constexpr
70 months operator-(const month& __lhs, const month& __rhs) noexcept
71 {
72     auto const __dm = static_cast<unsigned>(__lhs) - static_cast<unsigned>(__rhs);
73     return months(__dm <= 11 ? __dm : __dm + 12);
74 }
75 
76 _LIBCPP_HIDE_FROM_ABI inline constexpr
77 month& month::operator+=(const months& __dm) noexcept
78 { *this = *this + __dm; return *this; }
79 
80 _LIBCPP_HIDE_FROM_ABI inline constexpr
81 month& month::operator-=(const months& __dm) noexcept
82 { *this = *this - __dm; return *this; }
83 
84 inline constexpr month January{1};
85 inline constexpr month February{2};
86 inline constexpr month March{3};
87 inline constexpr month April{4};
88 inline constexpr month May{5};
89 inline constexpr month June{6};
90 inline constexpr month July{7};
91 inline constexpr month August{8};
92 inline constexpr month September{9};
93 inline constexpr month October{10};
94 inline constexpr month November{11};
95 inline constexpr month December{12};
96 
97 } // namespace chrono
98 
99 _LIBCPP_END_NAMESPACE_STD
100 
101 #endif // _LIBCPP_STD_VER >= 20
102 
103 #endif // _LIBCPP___CHRONO_MONTH_H
104