forked from mpusz/mp-units
416 lines
15 KiB
C++
416 lines
15 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/concepts.h>
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#include <units/customization_points.h>
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#include <units/bits/dimension_op.h>
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#include <units/bits/external/type_traits.h>
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#include <cassert>
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namespace units {
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constexpr std::intmax_t ipow10(std::intmax_t exp)
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{
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assert(exp >= 0);
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if (exp == 0) return 1;
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std::intmax_t result = 1;
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while (exp > 0) {
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result *= 10;
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--exp;
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}
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return result;
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}
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template<typename Rep>
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constexpr Rep fpow10(std::intmax_t exp)
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{
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if (exp == 0) return Rep(1.0);
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Rep result = Rep(1.0);
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if (exp < 0) {
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while (exp < 0) {
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result = result / Rep(10.0);
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++exp;
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}
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} else {
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while (exp > 0) {
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result = result * Rep(10.0);
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--exp;
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}
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}
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return result;
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}
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// QuantityOf
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template<typename T, typename Dim>
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concept QuantityOf = Quantity<T> && Dimension<Dim> && equivalent_dim<typename T::dimension, Dim>;
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// quantity_cast
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namespace detail {
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template<typename To, ratio CRatio, typename CRep, bool NumIsOne, bool DenIsOne, bool ExpIsZero>
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struct quantity_cast_impl;
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template<typename To, ratio CRatio, typename CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, true, true> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(q.count()));
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, true, false> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(fpow10<CRep>(CRatio.exp))));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(ipow10(CRatio.exp))));
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}
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else {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(ipow10(-CRatio.exp))));
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}
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}
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, false, true> {
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template<typename Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) *
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(static_cast<CRep>(CRatio.num) /
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static_cast<CRep>(CRatio.den))));
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, false, false> {
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template<typename Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) *
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static_cast<CRep>(fpow10<CRep>(CRatio.exp)) *
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(static_cast<CRep>(CRatio.num) /
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static_cast<CRep>(CRatio.den))));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) *
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static_cast<CRep>(CRatio.num) *
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static_cast<CRep>(ipow10(CRatio.exp)) /
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static_cast<CRep>(CRatio.den)));
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}
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else {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) *
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static_cast<CRep>(CRatio.num) /
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(static_cast<CRep>(CRatio.den) *
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static_cast<CRep>(ipow10(-CRatio.exp)))));
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}
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}
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, false, true> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(CRatio.den)));
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, false, false> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(fpow10<CRep>(CRatio.exp)) * (CRep{1} / static_cast<CRep>(CRatio.den))));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(ipow10(CRatio.exp)) / static_cast<CRep>(CRatio.den)));
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}
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else {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) / (static_cast<CRep>(ipow10(-CRatio.exp)) * static_cast<CRep>(CRatio.den))));
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}
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}
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, true, true> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CRatio.num)));
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}
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};
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template<typename To, ratio CRatio, constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, true, false> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CRatio.num) * static_cast<CRep>(fpow10<CRep>(CRatio.exp))));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CRatio.num) * static_cast<CRep>(ipow10(CRatio.exp))));
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}
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else {
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return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CRatio.num) / static_cast<CRep>(ipow10(-CRatio.exp))));
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}
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}
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, true, false> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(q.count() * fpow10<CRep>(CRatio.exp)));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(q.count() * ipow10(CRatio.exp)));
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}
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else {
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return To(static_cast<To::rep>(q.count() / ipow10(-CRatio.exp)));
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}
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}
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, false, true> {
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template<typename Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(q.count() * (CRatio.num / CRatio.den)));
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, false, false> {
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template<typename Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(q.count() * fpow10<CRep>(CRatio.exp) * (CRatio.num / CRatio.den)));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(q.count() * CRatio.num * ipow10(CRatio.exp) / CRatio.den));
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}
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else {
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return To(static_cast<To::rep>(q.count()) * CRatio.num / (CRatio.den * ipow10(-CRatio.exp)));
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}
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}
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, false, true> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(q.count() / CRatio.den));
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, true, false, false> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(q.count() * fpow10<CRep>(CRatio.exp) / CRatio.den));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(q.count() * ipow10(CRatio.exp) / CRatio.den));
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}
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else {
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return To(static_cast<To::rep>(q.count() / (ipow10(-CRatio.exp) * CRatio.den)));
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}
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}
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, true, true> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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return To(static_cast<To::rep>(q.count() * CRatio.num));
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}
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};
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template<typename To, ratio CRatio, not_constructible_from_integral CRep>
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struct quantity_cast_impl<To, CRatio, CRep, false, true, false> {
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template<Quantity Q>
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static constexpr To cast(const Q& q)
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{
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if constexpr (treat_as_floating_point<CRep>) {
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return To(static_cast<To::rep>(q.count() * CRatio.num * fpow10<CRep>(CRatio.exp)));
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} else {
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if constexpr (CRatio.exp > 0) {
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return To(static_cast<To::rep>(q.count() * CRatio.num * ipow10(CRatio.exp)));
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}
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else {
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return To(static_cast<To::rep>(q.count() * CRatio.num / ipow10(-CRatio.exp)));
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}
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}
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}
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};
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template<Dimension FromD, Unit FromU, Dimension ToD, Unit ToU>
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constexpr ratio cast_ratio()
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{
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if constexpr(BaseDimension<FromD> || same_unit_reference<FromU, ToU>::value) {
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return FromU::ratio / ToU::ratio;
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}
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else {
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const ratio from_ratio = FromD::base_units_ratio * FromU::ratio;
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const ratio to_ratio = ToD::base_units_ratio * ToU::ratio;
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return from_ratio / to_ratio;
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}
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}
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} // namespace detail
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/**
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* @brief Explcit cast of a quantity
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*
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* Implicit conversions between quantities of different types are allowed only for "safe"
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* (i.e. non-truncating) conversion. In such cases an explicit cast have to be used.
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*
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* This cast gets the target quantity type to cast to. For example:
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*
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* auto q1 = units::quantity_cast<units::physical::si::time<units::physical::si::second>>(1q_ms);
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*
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* @tparam To a target quantity type to cast to
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*/
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template<Quantity To, typename D, typename U, typename Rep>
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[[nodiscard]] constexpr auto quantity_cast(const quantity<D, U, Rep>& q)
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requires QuantityOf<To, D>
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{
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using c_ratio = std::integral_constant<ratio, detail::cast_ratio<D, U, typename To::dimension, typename To::unit>()>;
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using c_rep = std::common_type_t<typename To::rep, Rep>;
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using ret_unit = downcast_unit<typename To::dimension, To::unit::ratio>;
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using ret = quantity<typename To::dimension, ret_unit, typename To::rep>;
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using cast = detail::quantity_cast_impl<ret, c_ratio::value, c_rep, c_ratio::value.num == 1, c_ratio::value.den == 1, c_ratio::value.exp == 0>;
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return cast::cast(q);
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}
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/**
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* @brief Explcit cast of a quantity
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*
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* Implicit conversions between quantities of different types are allowed only for "safe"
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* (i.e. non-truncating) conversion. In such cases an explicit cast have to be used.
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*
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* This cast gets only the target dimension to cast to. For example:
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*
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* auto q1 = units::quantity_cast<units::physical::si::acceleration>(200q_Gal);
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*
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* @tparam ToD a dimension type to use for a target quantity
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*/
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template<Dimension ToD, typename D, typename U, typename Rep>
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[[nodiscard]] constexpr auto quantity_cast(const quantity<D, U, Rep>& q)
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requires equivalent_dim<ToD, D>
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{
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return quantity_cast<quantity<ToD, dimension_unit<ToD>, Rep>>(q);
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}
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/**
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* @brief Explcit cast of a quantity
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*
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* Implicit conversions between quantities of different types are allowed only for "safe"
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* (i.e. non-truncating) conversion. In such cases an explicit cast have to be used.
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*
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* This cast gets only the target unit to cast to. For example:
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*
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* auto q1 = units::quantity_cast<units::physical::si::second>(1q_ms);
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*
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* @tparam ToU a unit type to use for a target quantity
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*/
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template<Unit ToU, typename D, typename U, typename Rep>
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[[nodiscard]] constexpr auto quantity_cast(const quantity<D, U, Rep>& q)
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requires UnitOf<ToU, D>
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{
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return quantity_cast<quantity<D, ToU, Rep>>(q);
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}
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/**
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* @brief Explcit cast of a quantity
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*
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* Implicit conversions between quantities of different types are allowed only for "safe"
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* (i.e. non-truncating) conversion. In such cases an explicit cast have to be used.
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*
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* This cast gets only representation to cast to. For example:
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*
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* auto q1 = units::quantity_cast<int>(1q_ms);
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*
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* @tparam ToRep a representation type to use for a target quantity
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*/
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template<Scalar ToRep, typename D, typename U, typename Rep>
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[[nodiscard]] constexpr auto quantity_cast(const quantity<D, U, Rep>& q)
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{
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return quantity_cast<quantity<D, U, ToRep>>(q);
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}
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/**
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* @brief Explcit cast of a quantity point
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*
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* Implicit conversions between quantity points of different types are allowed only for "safe"
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* (i.e. non-truncating) conversion. In other cases an explicit cast has to be used.
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*
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* This cast gets the target quantity point type to cast to or anything that works for quantity_cast. For example:
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*
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* auto q1 = units::quantity_point_cast<decltype(quantity_point{0q_s})>(quantity_point{1q_ms});
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* auto q1 = units::quantity_point_cast<units::physical::si::time<units::physical::si::second>>(quantity_point{1q_ms});
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* auto q1 = units::quantity_point_cast<units::physical::si::acceleration>(quantity_point{200q_Gal});
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* auto q1 = units::quantity_point_cast<units::physical::si::second>(quantity_point{1q_ms});
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* auto q1 = units::quantity_point_cast<int>(quantity_point{1q_ms});
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*
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* @tparam CastSpec a target quantity point type to cast to or anything that works for quantity_cast
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*/
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template<typename CastSpec, typename D, typename U, typename Rep>
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[[nodiscard]] constexpr auto quantity_point_cast(const quantity_point<D, U, Rep>& qp)
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requires is_instantiation<CastSpec, quantity_point> ||
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requires(quantity<D, U, Rep> q) { quantity_cast<CastSpec>(q); }
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{
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if constexpr (is_instantiation<CastSpec, quantity_point>)
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return quantity_point(quantity_cast<typename CastSpec::quantity_type>(qp.relative()));
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else
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return quantity_point(quantity_cast<CastSpec>(qp.relative()));
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}
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} // namespace units
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