forked from mpusz/mp-units
102 lines
3.8 KiB
C++
102 lines
3.8 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/bits/dimension_op.h>
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namespace units {
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template<Dimension D, UnitOf<D> U, Scalar Rep>
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class quantity;
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template<Dimension D, UnitOf<D> U, Scalar Rep>
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class quantity_point;
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namespace detail {
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template<typename Q1, typename Q2, typename Rep>
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struct common_quantity_impl;
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template<typename D, typename U, typename Rep1, typename Rep2, typename Rep>
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struct common_quantity_impl<quantity<D, U, Rep1>, quantity<D, U, Rep2>, Rep> {
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using type = quantity<D, U, Rep>;
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};
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template<typename D, typename U1, typename Rep1, typename U2, typename Rep2, typename Rep>
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struct common_quantity_impl<quantity<D, U1, Rep1>, quantity<D, U2, Rep2>, Rep> {
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using type = quantity<D, downcast_unit<D, common_ratio(U1::ratio, U2::ratio)>, Rep>;
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};
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template<typename D1, typename U1, typename Rep1, typename D2, typename U2, typename Rep2, typename Rep>
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requires same_unit_reference<dimension_unit<D1>, dimension_unit<D2>>::value
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struct common_quantity_impl<quantity<D1, U1, Rep1>, quantity<D2, U2, Rep2>, Rep> {
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using type = quantity<D1, downcast_unit<D1, common_ratio(U1::ratio, U2::ratio)>, Rep>;
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};
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template<typename D1, typename U1, typename Rep1, typename D2, typename U2, typename Rep2, typename Rep>
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struct common_quantity_impl<quantity<D1, U1, Rep1>, quantity<D2, U2, Rep2>, Rep> {
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static constexpr ratio r1 = D1::base_units_ratio * U1::ratio;
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static constexpr ratio r2 = D2::base_units_ratio * U2::ratio;
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using type = quantity<D1, downcast_unit<D1, common_ratio(r1, r2)>, Rep>;
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};
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template<typename D, typename U, typename Rep>
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quantity_point<D, U, Rep> common_quantity_point_impl(quantity<D, U, Rep>);
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} // namespace detail
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template<Quantity Q1, Quantity Q2, Scalar Rep = std::common_type_t<typename Q1::rep, typename Q2::rep>>
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requires equivalent_dim<typename Q1::dimension, typename Q2::dimension>
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using common_quantity = detail::common_quantity_impl<Q1, Q2, Rep>::type;
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template<QuantityPoint QP1, QuantityPoint QP2>
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requires requires { typename common_quantity<typename QP1::quantity_type, typename QP2::quantity_type>; }
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using common_quantity_point = decltype(
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detail::common_quantity_point_impl(common_quantity<typename QP1::quantity_type, typename QP2::quantity_type>{}));
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} // namespace units
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#if COMP_GCC >= 10
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namespace std {
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#else
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namespace concepts {
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#endif
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template<units::Quantity Q1, units::Quantity Q2>
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requires units::equivalent_dim<typename Q1::dimension, typename Q2::dimension>
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struct common_type<Q1, Q2> {
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using type = units::common_quantity<Q1, Q2>;
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};
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template<units::QuantityPoint QP1, units::QuantityPoint QP2>
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requires requires { typename units::common_quantity_point<QP1, QP2>; }
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struct common_type<QP1, QP2> {
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using type = units::common_quantity_point<QP1, QP2>;
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};
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}
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