forked from mpusz/mp-units
99 lines
5.1 KiB
C++
99 lines
5.1 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include <units/format.h>
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#include <units/isq/si/fps/density.h>
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#include <units/isq/si/fps/length.h>
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#include <units/isq/si/fps/mass.h>
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#include <units/isq/si/fps/power.h>
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#include <units/isq/si/fps/speed.h>
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#include <units/isq/si/length.h>
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#include <units/isq/si/mass.h>
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#include <units/isq/si/power.h>
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#include <units/isq/si/speed.h>
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#include <units/isq/si/volume.h>
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#include <iostream>
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#include <string_view>
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using namespace units::aliases::isq;
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// Some basic specs for the warship
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struct Ship {
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si::fps::length::ft<> length;
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si::fps::length::ft<> draft;
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si::fps::length::ft<> beam;
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si::fps::speed::ft_per_s<> speed;
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si::fps::mass::lb<> mass;
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si::fps::length::in<> mainGuns;
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si::fps::mass::lb<> shellMass;
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si::fps::speed::ft_per_s<> shellSpeed;
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si::fps::power::ft_pdl_per_s<> power;
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};
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// Print 'a' in its current units and print its value cast to the units in each of Args
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template<class ...Args, units::Quantity Q>
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auto fmt_line(const Q a)
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{
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return fmt::format("{:22}", a) + (fmt::format(",{:20}", units::quantity_cast<Args>(a)) + ...);
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}
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// Print the ship details in the units as defined in the Ship struct, in other si::imperial units, and in SI
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void print_details(std::string_view description, const Ship& ship)
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{
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const auto waterDensity = si::fps::density::lb_per_ft3<>(62.4);
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std::cout << fmt::format("{}\n", description);
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std::cout << fmt::format("{:20} : {}\n", "length", fmt_line<si::fps::length::yd<>, si::length::m<>>(ship.length))
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<< fmt::format("{:20} : {}\n", "draft", fmt_line<si::fps::length::yd<>, si::length::m<>>(ship.draft))
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<< fmt::format("{:20} : {}\n", "beam", fmt_line<si::fps::length::yd<>, si::length::m<>>(ship.beam))
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<< fmt::format("{:20} : {}\n", "mass", fmt_line<si::fps::mass::lton<>, si::mass::t<>>(ship.mass))
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<< fmt::format("{:20} : {}\n", "speed", fmt_line<si::fps::speed::knot<>, si::speed::km_per_h<>>(ship.speed))
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<< fmt::format("{:20} : {}\n", "power", fmt_line<si::fps::power::hp<>, si::power::kW<>>(ship.power))
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<< fmt::format("{:20} : {}\n", "main guns", fmt_line<si::fps::length::in<>, si::length::mm<>>(ship.mainGuns))
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<< fmt::format("{:20} : {}\n", "fire shells weighing",fmt_line<si::fps::mass::lton<>, si::mass::kg<>>(ship.shellMass))
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<< fmt::format("{:20} : {}\n", "fire shells at",fmt_line<si::fps::speed::mph<>, si::speed::km_per_h<>>(ship.shellSpeed))
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<< fmt::format("{:20} : {}\n", "volume underwater", fmt_line<si::volume::m3<>, si::volume::l<>>(ship.mass / waterDensity));
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}
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int main()
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{
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using namespace units::aliases::isq::si;
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using namespace units::aliases::isq::si::fps;
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using units::aliases::isq::si::fps::length::ft; // to disambiguate from si::femptotonne
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// KMS Bismark, using the units the Germans would use, taken from Wiki
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auto bismark = Ship{.length{m<>(251.)}, .draft{m<>(9.3)}, .beam{m<>(36)}, .speed{km_per_h<>(56)}, .mass{t<>(50'300)}, .mainGuns{mm<>(380)}, .shellMass{kg<>(800)}, .shellSpeed{m_per_s<>(820.)}, .power{kW<>(110.45)}};
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// USS Iowa, using units from the foot-pound-second system
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auto iowa = Ship{.length{ft<>(860.)}, .draft{ft<>(37.) + in<>(2.)}, .beam{ft<>(108.) + in<>(2.)}, .speed{knot<>(33)}, .mass{lton<>(57'540)}, .mainGuns{in<>(16)}, .shellMass{lb<>(2700)}, .shellSpeed{ft_per_s<>(2690.)}, .power{hp<>(212'000)}};
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// HMS King George V, using units from the foot-pound-second system
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auto kgv = Ship{.length{ft<>(745.1)}, .draft{ft<>(33.) + in<>(7.5)}, .beam{ft<>(103.2) + in<>(2.5)}, .speed{knot<>(28.3)}, .mass{lton<>(42'245)}, .mainGuns{in<>(14)}, .shellMass{lb<>(1'590)}, .shellSpeed{ft_per_s<>(2483)}, .power{hp<>(110'000)}};
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print_details("KMS Bismark, defined in appropriate units from the SI system", bismark);
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std::cout << "\n\n";
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print_details("USS Iowa, defined in appropriate units foot-pound-second system", iowa);
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std::cout << "\n\n";
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print_details("HMS King George V, defined in appropriate units foot-pound-second system", kgv);
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}
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