2019-12-14 12:23:47 +01:00
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// 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/bits/external/downcasting.h>
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#include <units/exp.h>
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namespace units::detail {
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/**
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* @brief A dimension of a derived quantity
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*
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* Expression of the dependence of a quantity on the base quantities (and their base dimensions) of a system of
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* quantities as a product of powers of factors corresponding to the base quantities, omitting any numerical factors.
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* A power of a factor is the factor raised to an exponent.
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*
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2020-05-10 17:31:47 +02:00
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* A derived dimension can be formed from multiple exponents (i.e. speed is represented as "exp<L, 1>, exp<T, -1>").
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2019-12-14 12:23:47 +01:00
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* It is also possible to form a derived dimension with only one exponent (i.e. frequency is represented as just
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* "exp<T, -1>").
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*
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* @note This class template is used by the library engine and should not be directly instantiated by the user.
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*
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* @tparam E a first exponent of a derived dimension
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* @tparam ERest zero or more following exponents of a derived dimension
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*/
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template<Exponent E, Exponent... ERest>
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requires (BaseDimension<typename E::dimension> && ... && BaseDimension<typename ERest::dimension>)
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struct derived_dimension_base : downcast_base<derived_dimension_base<E, ERest...>> {
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using exponents = exp_list<E, ERest...>;
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};
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template<typename T>
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struct to_derived_dimension_base;
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template<Exponent... Es>
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struct to_derived_dimension_base<exp_list<Es...>> {
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using type = derived_dimension_base<Es...>;
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};
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} // namespace units::detail
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