forked from mpusz/mp-units
9527b39005
We had some fun exploring the STD UDLs for potential collisions, we have learnt our lesson and know how to proceed. Now is high time to start behaving and obeying C++ rules.
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::physical;
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using namespace units::physical::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 = 1.225_q_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(1000.0_q_mm, 500.0_q_mm, 200.0_q_mm);
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box.set_contents_density(1000.0_q_kg_per_m3);
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const auto fill_time = 200.0_q_s; // time since starting fill
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const auto measured_mass = 20.0_q_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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