forked from mpusz/mp-units
Mateusz Pusz
9527b39005
We had some fun exploring the STD UDLs for potential collisions, we have learnt our lesson and know how to proceed. Now is high time to start behaving and obeying C++ rules.
102 lines
3.1 KiB
C++
102 lines
3.1 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/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/speed.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::physical;
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Energy auto total_energy(Momentum auto p, Mass auto m, Speed 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 units::physical::si;
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using GeV = gigaelectronvolt;
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constexpr Speed 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 units::physical::natural;
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using GeV = gigaelectronvolt;
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constexpr Speed 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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