year_month_day_last.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2023 Tobias Hienzsch
 
#ifndef TETL_CHRONO_YEAR_MONTH_DAY_LAST_HPP
#define TETL_CHRONO_YEAR_MONTH_DAY_LAST_HPP
 
#include <etl/_chrono/local_t.hpp>
#include <etl/_chrono/month_day_last.hpp>
#include <etl/_chrono/system_clock.hpp>
#include <etl/_chrono/year.hpp>
 
namespace etl::chrono {
 
namespace detail {
 
[[nodiscard]] constexpr auto last_day_of_month(chrono::year const& y, chrono::month const& m) -> chrono::day
{
    constexpr chrono::day lastDays[] = {
        chrono::day{31},
        chrono::day{28},
        chrono::day{31},
        chrono::day{30},
        chrono::day{31},
        chrono::day{30},
        chrono::day{31},
        chrono::day{31},
        chrono::day{30},
        chrono::day{31},
        chrono::day{30},
        chrono::day{31},
    };
 
    if (m == chrono::month{2} and y.is_leap()) {
        return chrono::day{29};
    }
    return lastDays[static_cast<unsigned>(m) - 1];
}
 
} // namespace detail
 
/// \ingroup chrono
struct year_month_day_last {
    constexpr year_month_day_last(chrono::year const& y, chrono::month_day_last const& mdl) noexcept
        : _y{y}
        , _mdl{mdl}
    {
    }
 
    constexpr auto operator+=(months const& m) noexcept -> year_month_day_last&;
    constexpr auto operator-=(months const& m) noexcept -> year_month_day_last&;
    constexpr auto operator+=(years const& y) noexcept -> year_month_day_last&;
    constexpr auto operator-=(years const& y) noexcept -> year_month_day_last&;
 
    [[nodiscard]] constexpr auto year() const noexcept -> chrono::year
    {
        return _y;
    }
 
    [[nodiscard]] constexpr auto month() const noexcept -> chrono::month
    {
        return _mdl.month();
    }
 
    [[nodiscard]] constexpr auto month_day_last() const noexcept -> chrono::month_day_last
    {
        return _mdl;
    }
 
    [[nodiscard]] constexpr auto day() const noexcept -> chrono::day
    {
        return detail::last_day_of_month(year(), month());
    }
 
    [[nodiscard]] constexpr operator sys_days() const noexcept;
    [[nodiscard]] constexpr explicit operator local_days() const noexcept;
 
    [[nodiscard]] constexpr auto ok() const noexcept -> bool
    {
        return _y.ok() and _mdl.ok();
    }
 
private:
    chrono::year _y;
    chrono::month_day_last _mdl;
};
 
[[nodiscard]] constexpr auto operator+(chrono::year_month_day_last const& lhs, chrono::months const& rhs) noexcept
    -> chrono::year_month_day_last
{
    auto const ym = year_month{lhs.year(), lhs.month()} + rhs;
    return {ym.year(), month_day_last{ym.month()}};
}
 
[[nodiscard]] constexpr auto operator+(chrono::months const& lhs, chrono::year_month_day_last const& rhs) noexcept
    -> chrono::year_month_day_last
{
    return rhs + lhs;
}
 
[[nodiscard]] constexpr auto operator-(chrono::year_month_day_last const& lhs, chrono::months const& rhs) noexcept
    -> chrono::year_month_day_last
{
    return lhs + -rhs;
}
 
[[nodiscard]] constexpr auto operator+(chrono::year_month_day_last const& lhs, chrono::years const& rhs) noexcept
    -> chrono::year_month_day_last
{
    return {lhs.year() + rhs, lhs.month_day_last()};
}
 
[[nodiscard]] constexpr auto operator+(chrono::years const& lhs, chrono::year_month_day_last const& rhs) noexcept
    -> chrono::year_month_day_last
{
    return rhs + lhs;
}
 
[[nodiscard]] constexpr auto operator-(chrono::year_month_day_last const& lhs, chrono::years const& rhs) noexcept
    -> chrono::year_month_day_last
{
    return lhs + -rhs;
}
 
constexpr auto year_month_day_last::operator+=(months const& m) noexcept -> year_month_day_last&
{
    *this = *this + m;
    return *this;
}
 
constexpr auto year_month_day_last::operator-=(months const& m) noexcept -> year_month_day_last&
{
    *this = *this - m;
    return *this;
}
 
constexpr auto year_month_day_last::operator+=(years const& y) noexcept -> year_month_day_last&
{
    *this = *this + y;
    return *this;
}
 
constexpr auto year_month_day_last::operator-=(years const& y) noexcept -> year_month_day_last&
{
    *this = *this - y;
    return *this;
}
 
[[nodiscard]] constexpr auto operator/(year_month const& ym, last_spec /*tag*/) noexcept -> year_month_day_last
{
    return {ym.year(), month_day_last(ym.month())};
}
 
[[nodiscard]] constexpr auto operator/(year const& y, month_day_last const& mdl) noexcept -> year_month_day_last
{
    return {y, mdl};
}
 
[[nodiscard]] constexpr auto operator/(int y, month_day_last const& mdl) noexcept -> year_month_day_last
{
    return {year(y), mdl};
}
 
[[nodiscard]] constexpr auto operator/(month_day_last const& mdl, year const& y) noexcept -> year_month_day_last
{
    return {y, mdl};
}
 
[[nodiscard]] constexpr auto operator/(month_day_last const& mdl, int y) noexcept -> year_month_day_last
{
    return {year(y), mdl};
}
 
} // namespace etl::chrono
 
#endif // TETL_CHRONO_YEAR_MONTH_DAY_LAST_HPP