forked from mpusz/mp-units
125 lines
5.4 KiB
C++
125 lines
5.4 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 <mp-units/compat_macros.h>
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#include <iostream>
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#include <string_view>
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#ifdef MP_UNITS_MODULES
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import mp_units;
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#else
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#include <mp-units/format.h>
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#include <mp-units/systems/imperial/imperial.h>
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#include <mp-units/systems/international/international.h>
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#include <mp-units/systems/isq/mechanics.h>
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#include <mp-units/systems/isq/space_and_time.h>
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#include <mp-units/systems/si/unit_symbols.h>
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#endif
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using namespace mp_units;
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using namespace mp_units::international::unit_symbols;
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using namespace mp_units::si::unit_symbols;
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// Some basic specs for the warship
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struct Ship {
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quantity<isq::length[ft]> length;
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quantity<isq::length[ft]> draft;
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quantity<isq::length[ft]> beam;
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quantity<isq::speed[ft / s]> speed;
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quantity<isq::mass[lb]> mass;
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quantity<isq::length[in]> mainGuns;
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quantity<isq::mass[lb]> shellMass;
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quantity<isq::speed[ft / s]> shellSpeed;
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quantity<isq::power[ft * pdl / s]> power;
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};
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// Print 'q' in its current units and print its value cast to the units in each of Us
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template<Unit auto... Us, Quantity Q>
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auto fmt_line(const Q& q)
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{
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return MP_UNITS_STD_FMT::format("{:22}", q) + (MP_UNITS_STD_FMT::format(",{:20}", value_cast<Us>(q)) + ...);
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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 = 62.4 * isq::density[lb / cubic(ft)];
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std::cout << MP_UNITS_STD_FMT::format("{}\n", description);
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std::cout << MP_UNITS_STD_FMT::format("{:20} : {}\n", "length", fmt_line<yd, m>(ship.length))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "draft", fmt_line<yd, m>(ship.draft))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "beam", fmt_line<yd, m>(ship.beam))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "mass", fmt_line<imperial::long_ton, t>(ship.mass))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "speed", fmt_line<kt, km / h>(ship.speed))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "power", fmt_line<hp, kW>(ship.power))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "main guns", fmt_line<in, mm>(ship.mainGuns))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "fire shells weighing",
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fmt_line<imperial::long_ton, kg>(ship.shellMass))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "fire shells at", fmt_line<mph, km / h>(ship.shellSpeed))
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<< MP_UNITS_STD_FMT::format("{:20} : {}\n", "volume underwater", fmt_line<m3, l>(ship.mass / waterDensity));
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}
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int main()
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{
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using mp_units::international::unit_symbols::ft; // collides with si::femto<si::tonne>
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// KMS Bismark, using the units the Germans would use, taken from Wiki
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auto bismark = Ship{.length{251. * m},
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.draft{9.3 * m},
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.beam{36 * m},
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.speed{56 * km / h},
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.mass{50'300 * t},
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.mainGuns{380 * mm},
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.shellMass{800 * kg},
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.shellSpeed{820. * m / s},
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.power{110.45 * kW}};
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// USS Iowa, using units from the foot-pound-second system
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auto iowa = Ship{.length{860. * ft},
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.draft{37. * ft + 2. * in},
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.beam{108. * ft + 2. * in},
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.speed{33 * kt},
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.mass{57'540 * imperial::long_ton},
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.mainGuns{16 * in},
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.shellMass{2700 * lb},
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.shellSpeed{2690. * ft / s},
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.power{212'000 * hp}};
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// HMS King George V, using units from the foot-pound-second system
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auto kgv = Ship{.length{745.1 * ft},
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.draft{33. * ft + 7.5 * in},
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.beam{103.2 * ft + 2.5 * in},
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.speed{28.3 * kt},
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.mass{42'245 * imperial::long_ton},
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.mainGuns{14 * in},
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.shellMass{1590 * lb},
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.shellSpeed{2483. * ft / s},
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.power{110'000 * hp}};
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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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