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foot_pound_second example slightly refactored

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Mateusz Pusz
2020-06-16 17:44:32 +02:00
parent 50623e492e
commit a3a12229d9
1 changed files with 9 additions and 10 deletions
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19
example/foot_pound_second.cpp
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@ -54,18 +54,18 @@ struct Ship {
fps::mass<fps::pound> shellMass;
fps::speed<fps::foot_per_second> shellSpeed;
fps::power<fps::foot_poundal_per_second> power;
};
// Print 'a' in its current units and print its value cast to the units in each of Args
template<class ...Args, units::Quantity Q>
auto fmt_line(const Q a) {
return fmt::format("{:22}",a) + (fmt::format(",{:20}", units::quantity_cast<Args>(a)) + ...);
auto fmt_line(const Q a)
{
return fmt::format("{:22}", a) + (fmt::format(",{:20}", units::quantity_cast<Args>(a)) + ...);
}
// Print the ship details in the units as defined in the Ship struct, in other imperial units, and in SI
std::ostream& print_details(std::string_view description, const Ship& ship) {
void print_details(std::string_view description, const Ship& ship)
{
using namespace units::physical::fps::literals;
const auto waterDensity = 62.4q_lb_per_ft3;
std::cout << fmt::format("{}\n", description);
@ -79,7 +79,6 @@ std::ostream& print_details(std::string_view description, const Ship& ship) {
<< fmt::format("{:20} : {}\n", "fire shells weighing",fmt_line<fps::mass<fps::long_ton>, si::mass<si::kilogram>>(ship.shellMass))
<< fmt::format("{:20} : {}\n", "fire shells at",fmt_line<fps::speed<fps::mile_per_hour>, si::speed<si::kilometre_per_hour>>(ship.shellSpeed))
<< fmt::format("{:20} : {}\n", "volume underwater", fmt_line<si::volume<si::cubic_metre>, si::volume<si::litre>>(ship.mass / waterDensity));
return std::cout;
}
int main()
@ -87,7 +86,6 @@ int main()
using namespace units::physical::si::literals;
using namespace units::physical::fps::literals;
// KMS Bismark, using the units the Germans would use, taken from Wiki
auto bismark = Ship{.length{251.q_m}, .draft{9.3q_m}, .beam{36q_m}, .speed{56q_km_per_h}, .mass{50.3q_t}, .mainGuns{380q_mm}, .shellMass{800q_kg}, .shellSpeed{820.q_m_per_s}, .power{110.45q_kW}};
@ -97,8 +95,9 @@ int main()
// HMS King George V, using units from the foot-pound-second system
auto kgv = Ship{.length{745.1q_ft}, .draft{33.q_ft + 7.5q_in}, .beam{103.2q_ft + 2.5q_in}, .speed{28.3q_knot}, .mass{42'245q_lton}, .mainGuns{14q_in}, .shellMass{1'590q_lb}, .shellSpeed{2483.q_ft_per_s}, .power{110'000q_hp}};
print_details("KMS Bismark, defined in appropriate units from the SI system", bismark) << "\n\n";
print_details("USS Iowa, defined in appropriate units foot-pound-second system", iowa) << "\n\n";
print_details("KMS Bismark, defined in appropriate units from the SI system", bismark);
std::cout << "\n\n";
print_details("USS Iowa, defined in appropriate units foot-pound-second system", iowa);
std::cout << "\n\n";
print_details("HMS King George V, defined in appropriate units foot-pound-second system", kgv);
}