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.
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
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#include "./length.h"
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#include "./acceleration.h"
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#include "./density.h"
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#include "./force.h"
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#include "./mass.h"
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#include "./time.h"
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#include "./volume.h"
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#include <cassert>
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using namespace units::experimental;
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struct Box {
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static constexpr auto air_density = density::kg_per_m3<>{1.225};
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length::m<> length;
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length::m<> width;
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length::m<> height;
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constexpr Box(const length::m<>& l, const length::m<>& w, const length::m<>& h) : length{l}, width{w}, height{h} {}
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struct contents {
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density::kg_per_m3<> density = air_density;
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} contents;
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constexpr force::N<> filled_weight() const
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{
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const volume::m3<> volume = length * width * height;
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const mass::kg<> mass = contents.density * volume;
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return mass * acceleration::g<>;
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}
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constexpr length::m<> fill_level(const mass::kg<>& measured_mass) const
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{
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return height * (measured_mass * acceleration::g<>) / filled_weight();
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}
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constexpr volume::m3<> spare_capacity(const 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 density::kg_per_m3<>& 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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using namespace units::physical::si::literals;
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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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auto fill_time = 200.0_q_s; // time since starting fill
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auto measured_mass = 20.0_q_kg; // measured mass at fill_time
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std::cout << "mpusz/units box example ( using experimental alternative syntax for defining quantities) ...\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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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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