101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#pragma once
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#include <units/customization_points.h>
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// IWYU pragma: begin_exports
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#include <units/isq/si/time.h>
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#include <units/point_origin.h>
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#include <chrono>
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// IWYU pragma: end_exports
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namespace units {
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template<typename Rep, typename Period>
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struct quantity_like_traits<std::chrono::duration<Rep, Period>> {
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private:
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static constexpr auto mag = ::units::mag<ratio(Period::num, Period::den)>();
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public:
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using dimension = isq::si::dim_time;
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using unit = downcast_unit<dimension, mag>;
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using rep = Rep;
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[[nodiscard]] static constexpr rep number(const std::chrono::duration<Rep, Period>& q) { return q.count(); }
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};
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template<typename C>
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struct clock_origin : point_origin<isq::si::dim_time> {};
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template<typename C, typename Rep, typename Period>
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struct quantity_point_like_traits<std::chrono::time_point<C, std::chrono::duration<Rep, Period>>> {
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private:
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static constexpr auto mag = ::units::mag<ratio(Period::num, Period::den)>();
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public:
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using origin = clock_origin<C>;
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using unit = downcast_unit<typename origin::dimension, mag>;
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using rep = Rep;
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[[nodiscard]] static constexpr auto relative(const std::chrono::time_point<C, std::chrono::duration<Rep, Period>>& qp)
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{
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return qp.time_since_epoch();
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}
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};
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namespace detail {
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template<typename C, typename Rep, typename Period>
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inline constexpr bool is_quantity_point_like<std::chrono::time_point<C, std::chrono::duration<Rep, Period>>> = true;
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constexpr std::intmax_t pow_10(std::intmax_t v)
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{
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gsl_Expects(v > 0);
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std::intmax_t res = 1;
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for (std::intmax_t i = 0; i < v; i++) res *= 10;
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return res;
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}
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template<ratio R>
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constexpr auto to_std_ratio_impl()
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{
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return std::ratio<R.num, R.den>{};
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}
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} // namespace detail
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// TODO ICE below on gcc-11 when `ratio` is used instead of `auto`
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template<auto R>
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using to_std_ratio = decltype(detail::to_std_ratio_impl<R>());
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template<typename U, typename Rep>
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[[nodiscard]] constexpr auto to_std_duration(const quantity<isq::si::dim_time, U, Rep>& q)
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{
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return std::chrono::duration<Rep, to_std_ratio<as_ratio(U::mag)>>(q.number());
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}
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template<typename C, typename U, typename Rep>
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[[nodiscard]] constexpr auto to_std_time_point(const quantity_point<clock_origin<C>, U, Rep>& qp)
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{
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using ret_type = std::chrono::time_point<C, std::chrono::duration<Rep, to_std_ratio<as_ratio(U::mag)>>>;
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return ret_type(to_std_duration(qp.relative()));
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}
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} // namespace units
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