forked from mpusz/mp-units
derived_dimension code split to a few smaller files
This commit is contained in:
Mateusz Pusz
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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/exp.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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struct exp_ratio {
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using base_ratio = E::dimension::base_unit::ratio;
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using positive_ratio = conditional<E::num * E::den < 0, ratio<base_ratio::den, base_ratio::num>, base_ratio>;
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static constexpr std::int64_t N = E::num * E::den < 0 ? -E::num : E::num;
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using pow = ratio_pow<positive_ratio, N>;
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using type = conditional<E::den == 2, ratio_sqrt<pow>, pow>;
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};
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template<typename ExpList>
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struct base_units_ratio_impl;
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template<typename E, typename... Es>
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struct base_units_ratio_impl<exp_list<E, Es...>> {
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using type = ratio_multiply<typename exp_ratio<E>::type, typename base_units_ratio_impl<exp_list<Es...>>::type>;
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};
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template<typename E>
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struct base_units_ratio_impl<exp_list<E>> {
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using type = exp_ratio<E>::type;
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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 D>
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using base_units_ratio = base_units_ratio_impl<typename D::exponents>::type;
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} // namespace units::detail
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@@ -0,0 +1,61 @@
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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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* A derived dimension can be formed from multiple exponents (i.e. velocity is represented as "exp<L, 1>, exp<T, -1>").
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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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@@ -0,0 +1,67 @@
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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/bits/external/type_list.h>
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#include <units/exp.h>
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#include <ratio> // TODO remove this dependency with #11
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namespace units::detail {
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/**
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* @brief Consolidates contiguous ranges of exponents of the same dimension
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*
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* If there is more than one exponent with the same dimension they are aggregated into one exponent by adding
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* their exponents. If this accumulation will result with 0, such a dimension is removed from the list.
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*
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* @tparam D derived dimension to consolidate
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*/
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template<typename ExpList>
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struct dim_consolidate;
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template<>
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struct dim_consolidate<exp_list<>> {
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using type = exp_list<>;
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};
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template<typename E>
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struct dim_consolidate<exp_list<E>> {
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using type = exp_list<E>;
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};
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template<typename E1, typename... ERest>
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struct dim_consolidate<exp_list<E1, ERest...>> {
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using type = type_list_push_front<typename dim_consolidate<exp_list<ERest...>>::type, E1>;
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};
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template<BaseDimension Dim, int Num1, int Den1, int Num2, int Den2, typename... ERest>
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struct dim_consolidate<exp_list<exp<Dim, Num1, Den1>, exp<Dim, Num2, Den2>, ERest...>> {
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// TODO: provide custom implementation for ratio_add
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using r1 = std::ratio<Num1, Den1>;
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using r2 = std::ratio<Num2, Den2>;
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using r = std::ratio_add<r1, r2>;
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using type = conditional<r::num == 0, typename dim_consolidate<exp_list<ERest...>>::type,
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typename dim_consolidate<exp_list<exp<Dim, r::num, r::den>, ERest...>>::type>;
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};
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} // namespace units::detail
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@@ -0,0 +1,59 @@
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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/bits/derived_dimension_base.h>
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#include <units/bits/external/type_list.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 Unpacks the list of potentially derived dimensions to a list containing only base dimensions
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*
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* @tparam Es Exponents of potentially derived dimensions
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*/
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template<Exponent... Es>
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struct dim_unpack;
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template<>
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struct dim_unpack<> {
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using type = exp_list<>;
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};
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template<BaseDimension Dim, int Num, int Den, Exponent... ERest>
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struct dim_unpack<exp<Dim, Num, Den>, ERest...> {
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using type = type_list_push_front<typename dim_unpack<ERest...>::type, exp<Dim, Num, Den>>;
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};
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template<DerivedDimension Dim, int Num, int Den, Exponent... ERest>
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struct dim_unpack<exp<Dim, Num, Den>, ERest...> {
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using type = dim_unpack<exp<downcast_base_t<Dim>, Num, Den>, ERest...>::type;
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};
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template<Exponent... Es, int Num, int Den, Exponent... ERest>
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struct dim_unpack<exp<derived_dimension_base<Es...>, Num, Den>, ERest...> {
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using type = type_list_push_front<typename dim_unpack<ERest...>::type, exp_multiply<Es, Num, Den>...>;
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};
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} // namespace units::detail
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