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