forked from mpusz/mp-units
57 lines
2.0 KiB
C++
57 lines
2.0 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/derived_dimension.h>
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namespace units::detail {
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// same_scaled_units
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template<typename ExpList, Unit... Us>
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inline constexpr bool same_scaled_units = false;
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template<typename... Es, Unit... Us>
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inline constexpr bool same_scaled_units<exp_list<Es...>, Us...> = (UnitOf<Us, typename Es::dimension> && ...);
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// deduced_unit
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template<Exponent E>
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constexpr ratio inverse_if_negative(const ratio& r)
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{
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if constexpr(E::num * E::den > 0)
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return r;
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else
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return inverse(r);
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}
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template<Unit... Us, typename... Es>
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constexpr ratio derived_ratio(exp_list<Es...>)
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{
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return (... * inverse_if_negative<Es>(pow<detail::abs(Es::num)>(Us::ratio) / dimension_unit<typename Es::dimension>::ratio));
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}
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template<DerivedDimension D, Unit... Us>
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using deduced_unit = scaled_unit<derived_ratio<Us...>(typename D::recipe()), typename D::coherent_unit::reference>;
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} // namespace units::detail
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