60 lines
2.3 KiB
C++
60 lines
2.3 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/derived_dimension_base.h>
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#include <units/bits/external/type_list.h>
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#include <units/exponent.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 = exponent_list<>;
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};
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template<BaseDimension Dim, std::intmax_t Num, std::intmax_t Den, Exponent... ERest>
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struct dim_unpack<exponent<Dim, Num, Den>, ERest...> {
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using type = type_list_push_front<typename dim_unpack<ERest...>::type, exponent<Dim, Num, Den>>;
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};
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template<DerivedDimension Dim, std::intmax_t Num, std::intmax_t Den, Exponent... ERest>
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struct dim_unpack<exponent<Dim, Num, Den>, ERest...> {
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using type = TYPENAME dim_unpack<exponent<downcast_base_t<Dim>, Num, Den>, ERest...>::type;
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};
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template<Exponent... Es, std::intmax_t Num, std::intmax_t Den, Exponent... ERest>
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struct dim_unpack<exponent<derived_dimension_base<Es...>, Num, Den>, ERest...> {
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using type = type_list_push_front<typename dim_unpack<ERest...>::type, exponent_multiply<Es, Num, Den>...>;
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};
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} // namespace units::detail
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