forked from mpusz/mp-units
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
#include <units/physical/si/acceleration.h>
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#include <units/physical/si/constants.h>
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#include <units/physical/si/density.h>
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#include <units/physical/si/force.h>
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#include <units/physical/si/length.h>
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#include <units/physical/si/mass.h>
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#include <units/physical/si/time.h>
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#include <units/physical/si/volume.h>
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#include <units/format.h>
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#include <cassert>
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namespace {
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using namespace units;
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using namespace units::si::literals;
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using m = si::metre;
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using kg = si::kilogram;
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using N = si::newton;
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using m3 = si::cubic_metre;
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using kgpm3 = si::kilogram_per_metre_cub;
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inline constexpr auto g = si::si2019::standard_gravity<>;
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} // namespace
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struct Box {
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static constexpr auto air_density = 1.225q_kg_per_m3;
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si::length<m> length;
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si::length<m> width;
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si::length<m> height;
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struct contents {
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si::density<kgpm3> density = air_density;
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} contents;
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constexpr Box(const si::length<m>& l, const si::length<m>& w, const si::length<m>& h) : length{l}, width{w}, height{h} {}
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constexpr si::force<N> filled_weight() const
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{
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const si::volume<m3> volume = length * width * height;
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const si::mass<kg> mass = contents.density * volume;
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return mass * g;
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}
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constexpr si::length<m> fill_level(const si::mass<kg>& 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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constexpr si::volume<m3> spare_capacity(const si::mass<kg>& measured_mass) const
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{
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return (height - fill_level(measured_mass)) * width * length;
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}
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constexpr void set_contents_density(const si::density<kgpm3>& density_in)
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{
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assert(density_in > air_density);
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contents.density = density_in;
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}
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};
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#include <iostream>
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int main()
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{
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auto box = Box(1000.0q_mm, 500.0q_mm, 200.0q_mm);
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box.set_contents_density(1000.0q_kg_per_m3);
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const auto fill_time = 200.0q_s; // time since starting fill
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const auto measured_mass = 20.0q_kg; // measured mass at fill_time
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std::cout << "mp-units box example...\n";
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std::cout << "fill height at " << fill_time << " = " << box.fill_level(measured_mass) << " ("
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<< (box.fill_level(measured_mass) / box.height) * 100 << "% full)\n";
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std::cout << "spare_capacity at " << fill_time << " = " << box.spare_capacity(measured_mass) << '\n';
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std::cout << "input flow rate after " << fill_time << " = " << measured_mass / fill_time << '\n';
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std::cout << "float rise rate = " << box.fill_level(measured_mass) / fill_time << '\n';
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const auto fill_time_left = (box.height / box.fill_level(measured_mass) - 1) * fill_time;
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std::cout << "box full E.T.A. at current flow rate = " << fill_time_left << '\n';
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}
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