72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
// The MIT License (MIT)
|
|
//
|
|
// Copyright (c) 2018 Mateusz Pusz
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
|
|
#pragma once
|
|
|
|
#include <units/derived_dimension.h>
|
|
|
|
namespace units::detail {
|
|
|
|
// same_scaled_units
|
|
template<typename ExpList, Unit... Us>
|
|
inline constexpr bool same_scaled_units = false;
|
|
|
|
template<typename... Es, Unit... Us>
|
|
inline constexpr bool same_scaled_units<exp_list<Es...>, Us...> = (UnitOf<Us, typename Es::dimension> && ...);
|
|
|
|
// deduced_unit
|
|
template<typename Result, int UnitExpNum, int UnitExpDen, typename UnitRatio>
|
|
struct ratio_op;
|
|
|
|
template<typename Result, int UnitExpDen, typename UnitRatio>
|
|
struct ratio_op<Result, 0, UnitExpDen, UnitRatio> {
|
|
using ratio = Result;
|
|
};
|
|
|
|
template<typename Result, int UnitExpNum, int UnitExpDen, typename UnitRatio>
|
|
struct ratio_op {
|
|
using calc_ratio =
|
|
conditional<(UnitExpNum * UnitExpDen > 0), ratio_multiply<Result, UnitRatio>, ratio_divide<Result, UnitRatio>>;
|
|
static constexpr int value = (UnitExpNum * UnitExpDen > 0) ? (UnitExpNum - UnitExpDen) : (UnitExpNum + UnitExpDen);
|
|
using ratio = ratio_op<calc_ratio, value, UnitExpDen, UnitRatio>::ratio;
|
|
};
|
|
|
|
template<typename ExpList, Unit... Us>
|
|
struct derived_ratio;
|
|
|
|
template<Unit... Us>
|
|
struct derived_ratio<exp_list<>, Us...> {
|
|
using ratio = ::units::ratio<1>;
|
|
};
|
|
|
|
template<typename E, typename... ERest, Unit U, Unit... URest>
|
|
struct derived_ratio<exp_list<E, ERest...>, U, URest...> {
|
|
using rest_ratio = derived_ratio<exp_list<ERest...>, URest...>::ratio;
|
|
using ratio = ratio_op<rest_ratio, E::num, E::den, typename U::ratio>::ratio;
|
|
};
|
|
|
|
template<DerivedDimension D, Unit... Us>
|
|
using deduced_unit =
|
|
scaled_unit<typename D::coherent_unit::reference, typename detail::derived_ratio<typename D::recipe, Us...>::ratio>;
|
|
|
|
} // namespace units::detail
|