forked from mpusz/mp-units
102 lines
3.0 KiB
C++
102 lines
3.0 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/physical/natural/constants.h>
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#include <units/physical/si/energy.h>
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#include <units/physical/si/momentum.h>
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#include <units/physical/si/velocity.h>
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#include <units/physical/si/constants.h>
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#include <units/math.h>
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#include <iostream>
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namespace {
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using namespace units;
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Energy AUTO total_energy(Momentum AUTO p, Mass AUTO m, Velocity AUTO c)
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{
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return sqrt(pow<2>(p * c) + pow<2>(m * pow<2>(c)));
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}
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void si_example()
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{
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using namespace si;
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using GeV = gigaelectronvolt;
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constexpr Velocity AUTO c = si2019::speed_of_light<>;
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std::cout << "\n*** SI units (c = " << c << ") ***\n";
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const Momentum AUTO p = 4.q_GeV / c;
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const Mass AUTO m = 3.q_GeV / pow<2>(c);
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const Energy AUTO E = total_energy(p, m, c);
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std::cout << "[in GeV]\n"
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<< "p = " << p << "\n"
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<< "m = " << m << "\n"
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<< "E = " << E << "\n";
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const momentum<kilogram_metre_per_second> p_si = p;
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const mass<kilogram> m_si = m;
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const energy<joule> E_si = total_energy(p_si, m_si, c);
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std::cout << "\n[in SI units]\n"
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<< "p = " << p_si << "\n"
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<< "m = " << m_si << "\n"
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<< "E = " << E_si << "\n";
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std::cout << "\n[converted from SI units back to GeV]\n"
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<< "E = " << quantity_cast<GeV>(E_si) << "\n";
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}
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void natural_example()
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{
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using namespace natural;
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using GeV = gigaelectronvolt;
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constexpr Velocity AUTO c = speed_of_light<>;
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const momentum<GeV> p(4);
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const mass<GeV> m(3);
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const Energy AUTO E = total_energy(p, m, c);
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std::cout << "\n*** Natural units (c = " << c << ") ***\n"
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<< "p = " << p << "\n"
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<< "m = " << m << "\n"
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<< "E = " << E << "\n";
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}
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} // namespace
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int main()
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{
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try {
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si_example();
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natural_example();
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}
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catch (const std::exception& ex) {
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std::cerr << "Unhandled std exception caught: " << ex.what() << '\n';
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}
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catch (...) {
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std::cerr << "Unhandled unknown exception caught\n";
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}
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}
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