forked from mpusz/mp-units
114 lines
3.1 KiB
C++
114 lines
3.1 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 "stdconcepts.h"
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#include <ratio>
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#include <type_traits>
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namespace std {
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template<typename T>
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struct type_identity { using type = T; };
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template<typename T>
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using type_identity_t = typename type_identity<T>::type;
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}
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namespace units {
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using namespace mp::std_concepts; // todo Remove when std::concepts will arrive
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template<typename T>
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concept bool Number = requires(T a, T b) {
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{ a + b } -> T;
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{ a - b } -> T;
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{ a * b } -> T;
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{ a / b } -> T;
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{ -a } -> T;
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{ a += b } -> T&;
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{ a -= b } -> T&;
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{ a *= b } -> T&;
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{ a /= b } -> T&;
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{ T{0} };// can construct a T from a zero
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// …
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} ;
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// static_sign
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template<std::intmax_t Pn>
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struct static_sign : std::integral_constant<std::intmax_t, (Pn < 0) ? -1 : 1> {
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};
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// static_abs
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template<std::intmax_t Pn>
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struct static_abs : std::integral_constant<std::intmax_t, Pn * static_sign<Pn>::value> {
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};
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// static_gcd
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template<std::intmax_t Pn, std::intmax_t Qn>
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struct static_gcd : static_gcd<Qn, (Pn % Qn)> {
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};
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template<std::intmax_t Pn>
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struct static_gcd<Pn, 0> : std::integral_constant<std::intmax_t, static_abs<Pn>::value> {
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};
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template<std::intmax_t Qn>
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struct static_gcd<0, Qn> : std::integral_constant<std::intmax_t, static_abs<Qn>::value> {
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};
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// is_ratio
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namespace detail {
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template<typename T>
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inline constexpr bool is_ratio = false;
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template<intmax_t Num, intmax_t Den>
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inline constexpr bool is_ratio<std::ratio<Num, Den>> = true;
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} // namespace detail
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template<typename T>
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concept bool Ratio = detail::is_ratio<T>;
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// common_ratio
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// todo: simplified
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template<Ratio Ratio1, Ratio Ratio2>
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struct common_ratio {
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using gcd_num = static_gcd<Ratio1::num, Ratio2::num>;
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using gcd_den = static_gcd<Ratio1::den, Ratio2::den>;
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using type = std::ratio<gcd_num::value, (Ratio1::den / gcd_den::value) * Ratio2::den>;
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};
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template<Ratio Ratio1, Ratio Ratio2>
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using common_ratio_t = typename common_ratio<Ratio1, Ratio2>::type;
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} // namespace units
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