forked from mpusz/mp-units
52 lines
2.0 KiB
C++
52 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/base_dimension.h>
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#include <units/exponent.h>
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#include <units/ratio.h>
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namespace units::detail {
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template<Exponent E>
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requires (E::den == 1 || E::den == 2) // TODO provide support for any den
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constexpr ratio exp_ratio()
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{
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const ratio base_ratio = E::dimension::base_unit::ratio;
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const ratio positive_ratio = E::num * E::den < 0 ? ratio(base_ratio.den, base_ratio.num, -base_ratio.exp) : base_ratio;
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const std::intmax_t N = E::num * E::den < 0 ? -E::num : E::num;
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const ratio ratio_pow = pow<N>(positive_ratio);
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return E::den == 2 ? sqrt(ratio_pow) : ratio_pow;
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}
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/**
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* @brief Calculates the common ratio of all the references of base units in the derived dimension
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*/
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template<typename... Es>
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constexpr ratio base_units_ratio(exponent_list<Es...>)
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{
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return (exp_ratio<Es>() * ... * ratio(1));
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}
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} // namespace units::detail
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