libcxx/include/__chrono/month.h

   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