forked from mpusz/mp-units
b982921d27
Now References can be disabled to meassure a compile time impact. Also the same examples are now provided in two subdirectories to be able to easily compare the pros and cons of every quantity construction technique.
114 lines
3.6 KiB
C++
114 lines
3.6 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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#include <units/base_dimension.h>
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#include <units/isq/si/prefixes.h>
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#include <units/quantity.h>
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#include <units/quantity_io.h>
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#include <units/unit.h>
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#include <iostream>
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#include <type_traits>
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using namespace units;
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namespace fps {
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struct foot : named_unit<foot, "ft", no_prefix> {};
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struct yard : named_scaled_unit<yard, "yd", no_prefix, ratio(3), foot> {};
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struct dim_length : base_dimension<"L", foot> {};
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template<UnitOf<dim_length> U, Representation Rep = double>
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using length = quantity<dim_length, U, Rep>;
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} // namespace fps
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namespace si {
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struct metre : named_unit<metre, "m", units::isq::si::prefix> {};
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struct kilometre : prefixed_unit<kilometre, units::isq::si::kilo, metre> {};
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struct dim_length : base_dimension<"L", metre> {};
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template<UnitOf<dim_length> U, Representation Rep = double>
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using length = quantity<dim_length, U, Rep>;
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namespace fps {
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struct foot : named_scaled_unit<foot, "ft", no_prefix, ratio(3'048, 1'000, -1), metre> {};
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struct yard : named_scaled_unit<yard, "yd", no_prefix, ratio(3), foot> {};
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struct dim_length : base_dimension<"L", foot> {};
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template<UnitOf<dim_length> U, Representation Rep = double>
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using length = quantity<dim_length, U, Rep>;
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} // namespace fps
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} // namespace si
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void conversions()
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{
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// constexpr auto fps_yard = fps::length<fps::yard>(1.);
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// std::cout << quantity_cast<si::kilometre>(fps_yard) << "\n";
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constexpr auto si_fps_yard = si::fps::length<si::fps::yard>(1.);
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std::cout << quantity_cast<si::kilometre>(si_fps_yard) << "\n";
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}
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void unknown_dimensions()
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{
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constexpr auto fps_yard = fps::length<fps::yard>(1.);
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constexpr auto fps_area = quantity_cast<unknown_coherent_unit>(fps_yard * fps_yard);
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std::cout << fps_yard << "\n";
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std::cout << fps_area << "\n";
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constexpr auto si_fps_yard = si::fps::length<si::fps::yard>(1.);
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constexpr auto si_fps_area = quantity_cast<unknown_coherent_unit>(si_fps_yard * si_fps_yard);
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std::cout << si_fps_yard << "\n";
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std::cout << si_fps_area << "\n";
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}
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std::ostream& operator<<(std::ostream& os, const ratio& r)
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{
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return os << "ratio{" << r.num << ", " << r.den << ", " << r.exp << "}";
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}
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template<Unit U>
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std::ostream& operator<<(std::ostream& os, const U& u)
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{
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using unit_type = std::remove_cvref_t<decltype(u)>;
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return os << unit_type::ratio << " x " << unit_type::reference::symbol.standard();
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}
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void what_is_your_ratio()
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{
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std::cout << "fps: " << fps::yard() << "\n";
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std::cout << "si::fps: " << si::fps::yard() << "\n";
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}
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int main()
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{
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conversions();
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unknown_dimensions();
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what_is_your_ratio();
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}
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