temperature.hpp

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/*
 
Copyright 2025 Matthew Tolman
 
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 
   http://www.apache.org/licenses/LICENSE-2.0
 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 
*/
 
#ifndef MTCORE_UNITS_TEMPERATURE_HPP
#define MTCORE_UNITS_TEMPERATURE_HPP
 
#include "mtcore/units/base.hpp"
#include "temperature.hpp"
 
namespace mtcore::units {
  namespace temperature {
    constexpr auto kelvin     = Units<Unit<dimensions::TEMPERATURE>>{};
    constexpr auto celsius    = Units<Unit<dimensions::TEMPERATURE, std::ratio<1>, 0, std::ratio<5463, 20>>>{};
    constexpr auto fahrenheit = Units<Unit<dimensions::TEMPERATURE, std::ratio<5, 9>, 0, std::ratio<45967, 100>>>{};
 
    static_assert(0. * celsius == 273.15 * kelvin);
    static_assert((0. * fahrenheit) >= 255.372 * kelvin - 0.1 * kelvin);
    static_assert((0. * fahrenheit) <= 255.372 * kelvin + 0.1 * kelvin);
    static_assert(32. * fahrenheit >= 273.15 * kelvin - 0.01 * kelvin);
    static_assert(32. * fahrenheit <= 273.15 * kelvin + 0.01 * kelvin);
  }  // namespace temperature
 
  MTCORE_DEF_UNIT_NAME_SYM(temperature, kelvin, K, "°K")
  MTCORE_DEF_UNIT_NAME_SYM(temperature, celsius, C, "°C")
  MTCORE_DEF_UNIT_NAME_SYM(temperature, fahrenheit, F, "°F")
}  // namespace mtcore::units
 
#endif  // MTCORE_UNITS_TEMPERATURE_HPP