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87 lines
4.3 KiB
C++
87 lines
4.3 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/systems/natural.h>
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namespace {
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using namespace mp_units;
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using namespace mp_units::natural::unit_symbols;
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// In natural units, all quantities are expressed in powers of GeV
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// Quantity type safety is maintained through proper hierarchy
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// Test quantity hierarchy - mass is a kind of energy
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constexpr quantity test_mass = natural::mass(1. * GeV);
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static_assert(QuantityOf<decltype(test_mass), natural::energy>);
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// Test inverse_energy hierarchy - time and length are both inverse_energy
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constexpr quantity test_time = natural::time(1. / GeV);
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static_assert(QuantityOf<decltype(test_time), natural::inverse_energy>);
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constexpr quantity test_length = natural::length(1. / GeV);
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static_assert(QuantityOf<decltype(test_length), natural::inverse_energy>);
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// Dimensional relationships still hold at the unit level
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static_assert(1. / GeV / (1. / GeV) == 1. * one); // length/time = speed
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static_assert(1. / GeV / ((1. / GeV) * (1. / GeV)) == 1. * GeV); // length/time² = acceleration
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// All energy-dimension quantities are compatible
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static_assert(1. * GeV * (1. * one) == 1. * GeV); // mass * velocity = momentum (dimensionally)
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static_assert(1. * GeV * (1. * GeV) == 1. * GeV2); // mass * acceleration = force
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static_assert(1. * GeV * (1. * GeV) * (1. / GeV) == 1. * GeV); // force * length = energy
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// Quantity hierarchy tests
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using namespace mp_units::detail;
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using enum specs_convertible_result;
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static_assert(convertible(natural::mass, natural::energy) == yes);
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static_assert(convertible(natural::energy, natural::mass) == explicit_conversion);
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static_assert(convertible(natural::energy, natural::momentum) == explicit_conversion);
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static_assert(convertible(natural::mass, natural::momentum) == cast);
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static_assert(convertible(natural::time, natural::inverse_energy) == yes);
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static_assert(convertible(natural::inverse_energy, natural::time) == explicit_conversion);
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static_assert(convertible(natural::inverse_energy, natural::length) == explicit_conversion);
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static_assert(convertible(natural::time, natural::length) == cast);
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// Dimensionless quantity tests
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static_assert(convertible(natural::velocity, natural::speed) == yes);
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static_assert(convertible(natural::speed, natural::velocity) == explicit_conversion);
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static_assert(convertible(natural::speed, dimensionless) == yes);
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static_assert(convertible(natural::angular_measure, dimensionless) == yes);
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static_assert(convertible(natural::speed, natural::angular_measure) == cast);
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// Acceleration tests (acceleration has dimension energy in natural units)
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static_assert(convertible(natural::acceleration, natural::energy) == yes);
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static_assert(convertible(natural::energy, natural::acceleration) == explicit_conversion);
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// Force tests
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static_assert(convertible(natural::force, natural::energy_squared) == yes);
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static_assert(convertible(natural::energy_squared, natural::force) == explicit_conversion);
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// Cross-hierarchy tests (should never convert)
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static_assert(convertible(natural::energy, natural::inverse_energy) == no);
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static_assert(convertible(natural::energy, natural::energy_squared) == no);
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static_assert(convertible(natural::energy, dimensionless) == no);
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} // namespace
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