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 <__config>
  17 #include <compare>
  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
  30 class year_month {
  31     chrono::year  __y_;
  32     chrono::month __m_;
  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 { this->__m_ += __dm; return *this; }
  40     _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator-=(const months& __dm) noexcept { this->__m_ -= __dm; return *this; }
  41     _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator+=(const years& __dy)  noexcept { this->__y_ += __dy; return *this; }
  42     _LIBCPP_HIDE_FROM_ABI inline constexpr year_month& operator-=(const years& __dy)  noexcept { this->__y_ -= __dy; return *this; }
  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
  47 year_month operator/(const year& __y, const month& __m) noexcept { return year_month{__y, __m}; }
  48
  49 _LIBCPP_HIDE_FROM_ABI inline constexpr
  50 year_month operator/(const year& __y, int __m) noexcept { return year_month{__y, month(__m)}; }
  51
  52 _LIBCPP_HIDE_FROM_ABI inline constexpr
  53 bool operator==(const year_month& __lhs, const year_month& __rhs) noexcept
  54 { return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month(); }
  55
  56 _LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(const year_month& __lhs, const year_month& __rhs) noexcept {
  57     if (auto __c = __lhs.year() <=> __rhs.year(); __c != 0)
  58       return __c;
  59     return __lhs.month() <=> __rhs.month();
  60 }
  61
  62 _LIBCPP_HIDE_FROM_ABI constexpr
  63 year_month operator+(const year_month& __lhs, const months& __rhs) noexcept
  64 {
  65     int __dmi = static_cast<int>(static_cast<unsigned>(__lhs.month())) - 1 + __rhs.count();
  66     const int __dy = (__dmi >= 0 ? __dmi : __dmi-11) / 12;
  67     __dmi = __dmi - __dy * 12 + 1;
  68     return (__lhs.year() + years(__dy)) / month(static_cast<unsigned>(__dmi));
  69 }
  70
  71 _LIBCPP_HIDE_FROM_ABI constexpr
  72 year_month operator+(const months& __lhs, const year_month& __rhs) noexcept
  73 { return __rhs + __lhs; }
  74
  75 _LIBCPP_HIDE_FROM_ABI constexpr
  76 year_month operator+(const year_month& __lhs, const years& __rhs) noexcept
  77 { return (__lhs.year() + __rhs) / __lhs.month(); }
  78
  79 _LIBCPP_HIDE_FROM_ABI constexpr
  80 year_month operator+(const years& __lhs, const year_month& __rhs) noexcept
  81 { return __rhs + __lhs; }
  82
  83 _LIBCPP_HIDE_FROM_ABI constexpr
  84 months operator-(const year_month& __lhs, const year_month& __rhs) noexcept
  85 { return (__lhs.year() - __rhs.year()) + months(static_cast<unsigned>(__lhs.month()) - static_cast<unsigned>(__rhs.month())); }
  86
  87 _LIBCPP_HIDE_FROM_ABI constexpr
  88 year_month operator-(const year_month& __lhs, const months& __rhs) noexcept
  89 { return __lhs + -__rhs; }
  90
  91 _LIBCPP_HIDE_FROM_ABI constexpr
  92 year_month operator-(const year_month& __lhs, const years& __rhs) noexcept
  93 { return __lhs + -__rhs; }
  94
  95 } // namespace chrono
  96
  97 _LIBCPP_END_NAMESPACE_STD
  98
  99 #endif // _LIBCPP_STD_VER >= 20
 100
 101 #endif // _LIBCPP___CHRONO_YEAR_MONTH_H