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.
107 lines
4.1 KiB
C++
107 lines
4.1 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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#include <units/format.h>
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#include <units/generic/dimensionless.h>
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#include <units/isq/si/amount_of_substance.h>
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#include <units/isq/si/area.h>
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#include <units/isq/si/constants.h>
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#include <units/isq/si/density.h>
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#include <units/isq/si/force.h>
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#include <units/isq/si/length.h>
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#include <units/isq/si/mass.h>
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#include <units/isq/si/speed.h> // IWYU pragma: keep
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#include <units/isq/si/time.h>
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#include <units/isq/si/volume.h>
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#include <cassert>
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#include <iostream>
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#include <utility>
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namespace {
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using namespace units::isq;
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using namespace si::references;
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inline constexpr Acceleration auto g = si::si2019::standard_gravity<>;
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inline constexpr Density auto air_density = 1.225 * (kg / m3);
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class Box {
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si::area<si::square_metre> base_;
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si::length<si::metre> height_;
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si::density<si::kilogram_per_metre_cub> density_ = air_density;
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public:
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constexpr Box(const si::length<si::metre>& length, const si::length<si::metre>& width, si::length<si::metre> height) : base_(length * width), height_(std::move(height)) {}
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[[nodiscard]] constexpr si::force<si::newton> filled_weight() const
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{
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const Volume auto volume = base_ * height_;
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const Mass auto mass = density_ * volume;
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return mass * g;
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}
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[[nodiscard]] constexpr si::length<si::metre> fill_level(const si::mass<si::kilogram>& measured_mass) const
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{
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return height_ * measured_mass * g / filled_weight();
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}
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[[nodiscard]] constexpr si::volume<si::cubic_metre> spare_capacity(const si::mass<si::kilogram>& measured_mass) const
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{
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return (height_ - fill_level(measured_mass)) * base_;
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}
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constexpr void set_contents_density(const si::density<si::kilogram_per_metre_cub>& density_in)
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{
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assert(density_in > air_density);
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density_ = density_in;
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}
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};
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} // namespace
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int main()
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{
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using namespace units;
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const si::length<si::metre> height = 200.0 * mm;
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auto box = Box(1000.0 * mm, 500.0 * mm, height);
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box.set_contents_density(1000.0 * (kg / m3));
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const auto fill_time = 200.0 * s; // time since starting fill
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const auto measured_mass = 20.0 * kg; // measured mass at fill_time
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const Length auto fill_level = box.fill_level(measured_mass);
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const Dimensionless auto fill_percent = quantity_cast<percent>(fill_level / height);
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const Volume auto spare_capacity = box.spare_capacity(measured_mass);
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const auto input_flow_rate = measured_mass / fill_time; // unknown dimension
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const Speed auto float_rise_rate = fill_level / fill_time;
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const Time auto fill_time_left = (height / fill_level - 1) * fill_time;
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std::cout << "mp-units box example...\n";
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std::cout << fmt::format("fill height at {} = {} ({} full)\n", fill_time, fill_level, fill_percent);
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std::cout << fmt::format("spare_capacity at {} = {}\n", fill_time, spare_capacity);
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std::cout << fmt::format("input flow rate after {} = {}\n", fill_time, input_flow_rate);
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std::cout << fmt::format("float rise rate = {}\n", float_rise_rate);
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std::cout << fmt::format("box full E.T.A. at current flow rate = {}\n", fill_time_left);
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}
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