libcxx/include/__chrono/year_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_YEAR_MONTH_H
  11 #define _LIBCPP___CHRONO_YEAR_MONTH_H
  12
  13 #include <__chrono/duration.h>
  14 #include <__chrono/month.h>
  15 #include <__chrono/year.h>
  16 #include <__compare/ordering.h>
  17 #include <__config>
  18
  19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  20 #  pragma GCC system_header
  21 #endif
  22
  23 #if _LIBCPP_STD_VER >= 20
  24
  25 _LIBCPP_BEGIN_NAMESPACE_STD
  26
  27 namespace chrono {
  28
  29 class year_month {
  30   chrono::year __y_;
  31   chrono::month __m_;
  32
  33 public:
  34   year_month() = default;
  35   _LIBCPP_HIDE_FROM_ABI constexpr year_month(const chrono::year& __yval, const chrono::month& __mval) noexcept
  36       : __y_{__yval}, __m_{__mval} {}
  37   _LIBCPP_HIDE_FROM_ABI inline constexpr chrono::year year() const noexcept { return __y_; }
  38   _LIBCPP_HIDE_FROM_ABI inline constexpr chrono::month month() const noexcept { return __m_; }
  39   _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator+=(const months& __dm) noexcept;
  40   _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator-=(const months& __dm) noexcept;
  41   _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator+=(const years& __dy) noexcept;
  42   _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator-=(const years& __dy) noexcept;
  43   _LIBCPP_HIDE_FROM_ABI inline constexpr bool ok() const noexcept { return __y_.ok() && __m_.ok(); }
  44 };
  45
  46 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator/(const year& __y, const month& __m) noexcept {
  47   return year_month{__y, __m};
  48 }
  49
  50 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator/(const year& __y, int __m) noexcept {
  51   return year_month{__y, month(__m)};
  52 }
  53
  54 _LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(const year_month& __lhs, const year_month& __rhs) noexcept {
  55   return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month();
  56 }
  57
  58 _LIBCPP_HIDE_FROM_ABI inline constexpr strong_ordering
  59 operator<=>(const year_month& __lhs, const year_month& __rhs) noexcept {
  60   if (auto __c = __lhs.year() <=> __rhs.year(); __c != 0)
  61     return __c;
  62   return __lhs.month() <=> __rhs.month();
  63 }
  64
  65 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator+(const year_month& __lhs, const months& __rhs) noexcept {
  66   int __dmi      = static_cast<int>(static_cast<unsigned>(__lhs.month())) - 1 + __rhs.count();
  67   const int __dy = (__dmi >= 0 ? __dmi : __dmi - 11) / 12;
  68   __dmi          = __dmi - __dy * 12 + 1;
  69   return (__lhs.year() + years(__dy)) / month(static_cast<unsigned>(__dmi));
  70 }
  71
  72 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator+(const months& __lhs, const year_month& __rhs) noexcept {
  73   return __rhs + __lhs;
  74 }
  75
  76 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator+(const year_month& __lhs, const years& __rhs) noexcept {
  77   return (__lhs.year() + __rhs) / __lhs.month();
  78 }
  79
  80 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator+(const years& __lhs, const year_month& __rhs) noexcept {
  81   return __rhs + __lhs;
  82 }
  83
  84 _LIBCPP_HIDE_FROM_ABI inline constexpr months operator-(const year_month& __lhs, const year_month& __rhs) noexcept {
  85   return (__lhs.year() - __rhs.year()) +
  86          months(static_cast<unsigned>(__lhs.month()) - static_cast<unsigned>(__rhs.month()));
  87 }
  88
  89 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator-(const year_month& __lhs, const months& __rhs) noexcept {
  90   return __lhs + -__rhs;
  91 }
  92
  93 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month operator-(const year_month& __lhs, const years& __rhs) noexcept {
  94   return __lhs + -__rhs;
  95 }
  96
  97 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& year_month::operator+=(const months& __dm) noexcept {
  98   *this = *this + __dm;
  99   return *this;
 100 }
 101
 102 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& year_month::operator-=(const months& __dm) noexcept {
 103   *this = *this - __dm;
 104   return *this;
 105 }
 106
 107 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& year_month::operator+=(const years& __dy) noexcept {
 108   *this = *this + __dy;
 109   return *this;
 110 }
 111
 112 _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& year_month::operator-=(const years& __dy) noexcept {
 113   *this = *this - __dy;
 114   return *this;
 115 }
 116
 117 } // namespace chrono
 118
 119 _LIBCPP_END_NAMESPACE_STD
 120
 121 #endif // _LIBCPP_STD_VER >= 20
 122
 123 #endif // _LIBCPP___CHRONO_YEAR_MONTH_H