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 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #  pragma GCC system_header
18 #endif
19 
20 #if _LIBCPP_STD_VER > 17
21 
22 _LIBCPP_BEGIN_NAMESPACE_STD
23 
24 namespace chrono
25 {
26 
27 class month {
28 private:
29     unsigned char __m;
30 public:
31     _LIBCPP_HIDE_FROM_ABI month() = default;
32     _LIBCPP_HIDE_FROM_ABI explicit inline constexpr month(unsigned __val) noexcept : __m(static_cast<unsigned char>(__val)) {}
33     _LIBCPP_HIDE_FROM_ABI inline constexpr month& operator++()    noexcept { ++__m; return *this; }
34     _LIBCPP_HIDE_FROM_ABI inline constexpr month  operator++(int) noexcept { month __tmp = *this; ++(*this); return __tmp; }
35     _LIBCPP_HIDE_FROM_ABI inline constexpr month& operator--()    noexcept { --__m; return *this; }
36     _LIBCPP_HIDE_FROM_ABI inline constexpr month  operator--(int) noexcept { month __tmp = *this; --(*this); return __tmp; }
37     _LIBCPP_HIDE_FROM_ABI        constexpr month& operator+=(const months& __m1) noexcept;
38     _LIBCPP_HIDE_FROM_ABI        constexpr month& operator-=(const months& __m1) noexcept;
39     _LIBCPP_HIDE_FROM_ABI explicit inline constexpr operator unsigned() const noexcept { return __m; }
40     _LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __m >= 1 && __m <= 12; }
41 };
42 
43 
44 _LIBCPP_HIDE_FROM_ABI inline constexpr
45 bool operator==(const month& __lhs, const month& __rhs) noexcept
46 { return static_cast<unsigned>(__lhs) == static_cast<unsigned>(__rhs); }
47 
48 _LIBCPP_HIDE_FROM_ABI inline constexpr
49 bool operator!=(const month& __lhs, const month& __rhs) noexcept
50 { return !(__lhs == __rhs); }
51 
52 _LIBCPP_HIDE_FROM_ABI inline constexpr
53 bool operator< (const month& __lhs, const month& __rhs) noexcept
54 { return static_cast<unsigned>(__lhs)  < static_cast<unsigned>(__rhs); }
55 
56 _LIBCPP_HIDE_FROM_ABI inline constexpr
57 bool operator> (const month& __lhs, const month& __rhs) noexcept
58 { return __rhs < __lhs; }
59 
60 _LIBCPP_HIDE_FROM_ABI inline constexpr
61 bool operator<=(const month& __lhs, const month& __rhs) noexcept
62 { return !(__rhs < __lhs); }
63 
64 _LIBCPP_HIDE_FROM_ABI inline constexpr
65 bool operator>=(const month& __lhs, const month& __rhs) noexcept
66 { return !(__lhs < __rhs); }
67 
68 _LIBCPP_HIDE_FROM_ABI inline constexpr
69 month operator+ (const month& __lhs, const months& __rhs) noexcept
70 {
71     auto const __mu = static_cast<long long>(static_cast<unsigned>(__lhs)) + (__rhs.count() - 1);
72     auto const __yr = (__mu >= 0 ? __mu : __mu - 11) / 12;
73     return month{static_cast<unsigned>(__mu - __yr * 12 + 1)};
74 }
75 
76 _LIBCPP_HIDE_FROM_ABI inline constexpr
77 month operator+ (const months& __lhs, const month& __rhs) noexcept
78 { return __rhs + __lhs; }
79 
80 _LIBCPP_HIDE_FROM_ABI inline constexpr
81 month operator- (const month& __lhs, const months& __rhs) noexcept
82 { return __lhs + -__rhs; }
83 
84 _LIBCPP_HIDE_FROM_ABI inline constexpr
85 months operator-(const month& __lhs, const month& __rhs) noexcept
86 {
87     auto const __dm = static_cast<unsigned>(__lhs) - static_cast<unsigned>(__rhs);
88     return months(__dm <= 11 ? __dm : __dm + 12);
89 }
90 
91 _LIBCPP_HIDE_FROM_ABI inline constexpr
92 month& month::operator+=(const months& __dm) noexcept
93 { *this = *this + __dm; return *this; }
94 
95 _LIBCPP_HIDE_FROM_ABI inline constexpr
96 month& month::operator-=(const months& __dm) noexcept
97 { *this = *this - __dm; return *this; }
98 
99 inline constexpr month January{1};
100 inline constexpr month February{2};
101 inline constexpr month March{3};
102 inline constexpr month April{4};
103 inline constexpr month May{5};
104 inline constexpr month June{6};
105 inline constexpr month July{7};
106 inline constexpr month August{8};
107 inline constexpr month September{9};
108 inline constexpr month October{10};
109 inline constexpr month November{11};
110 inline constexpr month December{12};
111 
112 } // namespace chrono
113 
114 _LIBCPP_END_NAMESPACE_STD
115 
116 #endif // _LIBCPP_STD_VER > 17
117 
118 #endif // _LIBCPP___CHRONO_MONTH_H
119