135 lines
5.6 KiB
C++
135 lines
5.6 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/dimension.h>
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#include <units/ratio.h>
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#include <ratio>
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namespace std::experimental::units {
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template<Dimension D, Ratio R = ratio<1>>
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requires (R::num > 0)
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struct unit : downcast_base<unit<D, R>> {
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using dimension = D;
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using ratio = R;
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};
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// is_unit
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namespace detail {
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template<typename T>
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inline constexpr bool is_unit = false;
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template<Dimension D, Ratio R>
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inline constexpr bool is_unit<unit<D, R>> = true;
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}
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template<typename T>
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concept bool Unit =
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std::is_empty_v<T> &&
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detail::is_unit<downcast_from<T>>;
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// derived_unit
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namespace detail {
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template<Dimension D>
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struct get_unit_base_dim;
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template<Exponent E, Exponent... Rest>
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struct get_unit_base_dim<dimension<E, Rest...>> {
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static_assert(sizeof...(Rest) == 0, "Base unit expected");
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using dimension = E::dimension;
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};
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template<typename BaseDimension, Unit... Us>
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struct get_ratio {
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using ratio = ::std::experimental::units::ratio<1>;
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};
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template<typename BaseDimension, Unit U, Unit... Rest>
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struct get_ratio<BaseDimension, U, Rest...> {
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using unit_base_dim = get_unit_base_dim<typename U::dimension::base_type>::dimension;
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using ratio = conditional<unit_base_dim::value == BaseDimension::value, typename U::ratio,
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typename get_ratio<BaseDimension, Rest...>::ratio>;
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};
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template<Ratio Result, int UnitExpValue, Ratio UnitRatio>
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struct ratio_op;
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template<Ratio Result, Ratio UnitRatio>
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struct ratio_op<Result, 0, UnitRatio> {
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using ratio = Result;
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};
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template<Ratio Result, int UnitExpValue, Ratio UnitRatio>
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struct ratio_op {
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using calc_ratio = conditional<(UnitExpValue > 0), ratio_multiply<Result, UnitRatio>,
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ratio_divide<Result, UnitRatio>>;
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static constexpr int value = UnitExpValue > 0 ? UnitExpValue - 1 : UnitExpValue + 1;
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using ratio = ratio_op<calc_ratio, value, UnitRatio>::ratio;
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};
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template<Dimension D, Unit... Us>
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struct derived_ratio;
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template<Unit... Us>
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struct derived_ratio<dimension<>, Us...> {
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using ratio = ::std::experimental::units::ratio<1>;
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};
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template<Exponent E, Exponent... Rest, Unit... Us>
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struct derived_ratio<dimension<E, Rest...>, Us...> {
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using rest_ratio = derived_ratio<dimension<Rest...>, Us...>::ratio;
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using e_ratio = get_ratio<typename E::dimension, Us...>::ratio;
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using ratio = ratio_op<rest_ratio, E::value, e_ratio>::ratio;
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};
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}
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template<Dimension D, Unit... Us>
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using derived_unit = unit<D, typename detail::derived_ratio<typename D::base_type, Us...>::ratio>;
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// prefixes
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template<Unit U> using atto = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::atto::den>>>;
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template<Unit U> using femto = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::femto::den>>>;
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template<Unit U> using pico = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::pico::den>>>;
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template<Unit U> using nano = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::nano::den>>>;
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template<Unit U> using micro = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::micro::den>>>;
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template<Unit U> using milli = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::milli::den>>>;
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template<Unit U> using centi = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<1, std::centi::den>>>;
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template<Unit U> using deca = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::deca::num>>>;
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template<Unit U> using hecto = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::hecto::num>>>;
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template<Unit U> using kilo = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::kilo::num>>>;
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template<Unit U> using mega = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::mega::num>>>;
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template<Unit U> using giga = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::giga::num>>>;
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template<Unit U> using tera = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::tera::num>>>;
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template<Unit U> using peta = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::peta::num>>>;
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template<Unit U> using exa = unit<typename U::dimension, ratio_multiply<typename U::ratio, ratio<std::exa::num>>>;
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} // namespace std::experimental::units
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