forked from mpusz/mp-units
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
#include <units/isq/si/constants.h>
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#include <units/isq/si/area.h>
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#include <units/isq/si/speed.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/mass.h>
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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 <units/format.h>
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#include <cassert>
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#include <iostream>
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namespace {
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using namespace units::isq;
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using m = si::metre;
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using m2 = si::square_metre;
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using m3 = si::cubic_metre;
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using kg = si::kilogram;
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using N = si::newton;
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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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inline constexpr si::density<kgpm3> air_density(1.225);
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class Box {
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si::area<m2> base_;
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si::length<m> height_;
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si::density<kgpm3> density_ = air_density;
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public:
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constexpr Box(const si::length<m>& length, const si::length<m>& width, si::length<m> height) : base_(length * width), height_(std::move(height)) {}
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[[nodiscard]] constexpr si::force<N> filled_weight() const
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{
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const si::volume<m3> volume = base_ * height_;
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const si::mass<kg> mass = density_ * volume;
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return mass * g;
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}
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[[nodiscard]] 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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[[nodiscard]] 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)) * base_;
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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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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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using namespace si::literals;
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const si::length<m> height(200.0_q_mm);
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auto box = Box(1000.0_q_mm, 500.0_q_mm, height);
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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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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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