TemperatureDifference.hpp

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// Copyright © 2020-2024 Alexandre Coderre-Chabot
//
// This file is part of Physical Quantities (PhQ), a C++ library of physical quantities, physical
// models, and units of measure for scientific computing.
//
// Physical Quantities is hosted at:
//     https://github.com/acodcha/phq
//
// Physical Quantities is licensed under the MIT License:
//     https://mit-license.org
//
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#ifndef PHQ_UNIT_TEMPERATURE_DIFFERENCE_HPP
#define PHQ_UNIT_TEMPERATURE_DIFFERENCE_HPP
 
#include <cstddef>
#include <cstdint>
#include <functional>
#include <map>
#include <ostream>
#include <string_view>
#include <unordered_map>
 
#include "../Base.hpp"
#include "../Dimension/ElectricCurrent.hpp"
#include "../Dimension/Length.hpp"
#include "../Dimension/LuminousIntensity.hpp"
#include "../Dimension/Mass.hpp"
#include "../Dimension/SubstanceAmount.hpp"
#include "../Dimension/Temperature.hpp"
#include "../Dimension/Time.hpp"
#include "../Dimensions.hpp"
#include "../Unit.hpp"
#include "../UnitSystem.hpp"
 
namespace PhQ {
 
namespace Unit {
 
/// \brief Temperature difference units. Not to be confused with temperature units. For example, a
/// temperature difference of +20 °C corresponds to a temperature difference of +36 °F, whereas a
/// temperature of 20 °C corresponds to a temperature of 68 °F.
enum class TemperatureDifference : int8_t {
  /// \brief Kelvin (K) temperature difference unit.
  Kelvin,
 
  /// \brief Degree Celsius (°C) temperature difference unit.
  Celsius,
 
  /// \brief Degree Rankine (°R) temperature difference unit.
  Rankine,
 
  /// \brief Degree Fahrenheit (°F) temperature difference unit.
  Fahrenheit,
};
 
}  // namespace Unit
 
/// \brief Standard temperature difference unit: kelvin (K).
template <>
inline constexpr const Unit::TemperatureDifference Standard<Unit::TemperatureDifference>{
  Unit::TemperatureDifference::Kelvin};
 
/// \brief Physical dimension set of temperature difference units.
template <>
inline constexpr const Dimensions RelatedDimensions<Unit::TemperatureDifference>{
  Dimensions{Dimension::Time{0}, Dimension::Length{0}, Dimension::Mass{0},
             Dimension::ElectricCurrent{0}, Dimension::Temperature{1},
             Dimension::SubstanceAmount{0}, Dimension::LuminousIntensity{0}}
};
 
inline std::ostream& operator<<(std::ostream& stream, const Unit::TemperatureDifference unit) {
  stream << Abbreviation(unit);
  return stream;
}
 
namespace Internal {
 
template <>
inline const std::map<UnitSystem, Unit::TemperatureDifference>
    ConsistentUnits<Unit::TemperatureDifference>{
      {UnitSystem::MetreKilogramSecondKelvin,  Unit::TemperatureDifference::Kelvin },
      {UnitSystem::MillimetreGramSecondKelvin, Unit::TemperatureDifference::Kelvin },
      {UnitSystem::FootPoundSecondRankine,     Unit::TemperatureDifference::Rankine},
      {UnitSystem::InchPoundSecondRankine,     Unit::TemperatureDifference::Rankine},
};
 
template <>
inline const std::map<Unit::TemperatureDifference, UnitSystem>
    RelatedUnitSystems<Unit::TemperatureDifference>{};
 
// clang-format off
 
template <>
inline const std::map<Unit::TemperatureDifference, std::string_view>
    Abbreviations<Unit::TemperatureDifference>{
        {Unit::TemperatureDifference::Kelvin,     "K" },
        {Unit::TemperatureDifference::Celsius,    "°C"},
        {Unit::TemperatureDifference::Rankine,    "°R"},
        {Unit::TemperatureDifference::Fahrenheit, "°F"},
};
 
template <>
inline const std::unordered_map<std::string_view, Unit::TemperatureDifference>
    Spellings<Unit::TemperatureDifference>{
        {"K",    Unit::TemperatureDifference::Kelvin    },
        {"°K",   Unit::TemperatureDifference::Kelvin    },
        {"degK", Unit::TemperatureDifference::Kelvin    },
        {"°C",   Unit::TemperatureDifference::Celsius   },
        {"C",    Unit::TemperatureDifference::Celsius   },
        {"degC", Unit::TemperatureDifference::Celsius   },
        {"°R",   Unit::TemperatureDifference::Rankine   },
        {"R",    Unit::TemperatureDifference::Rankine   },
        {"degR", Unit::TemperatureDifference::Rankine   },
        {"°F",   Unit::TemperatureDifference::Fahrenheit},
        {"F",    Unit::TemperatureDifference::Fahrenheit},
        {"degF", Unit::TemperatureDifference::Fahrenheit},
};
 
// clang-format on
 
template <>
template <typename NumericType>
inline constexpr void Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Kelvin>::
    FromStandard(NumericType& /*value*/) noexcept {}
 
template <>
template <typename NumericType>
inline constexpr void Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Kelvin>::
    ToStandard(NumericType& /*value*/) noexcept {}
 
template <>
template <typename NumericType>
inline constexpr void
Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Celsius>::FromStandard(
    NumericType& /*value*/) noexcept {}
 
template <>
template <typename NumericType>
inline constexpr void
Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Celsius>::ToStandard(
    NumericType& /*value*/) noexcept {}
 
template <>
template <typename NumericType>
inline constexpr void
Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Rankine>::FromStandard(
    NumericType& value) noexcept {
  value *= static_cast<NumericType>(1.8L);
}
 
template <>
template <typename NumericType>
inline constexpr void
Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Rankine>::ToStandard(
    NumericType& value) noexcept {
  value /= static_cast<NumericType>(1.8L);
}
 
template <>
template <typename NumericType>
inline constexpr void
Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Fahrenheit>::FromStandard(
    NumericType& value) noexcept {
  value *= static_cast<NumericType>(1.8L);
}
 
template <>
template <typename NumericType>
inline constexpr void
Conversion<Unit::TemperatureDifference, Unit::TemperatureDifference::Fahrenheit>::ToStandard(
    NumericType& value) noexcept {
  value /= static_cast<NumericType>(1.8L);
}
 
template <typename NumericType>
inline const std::map<Unit::TemperatureDifference,
                      std::function<void(NumericType* values, const std::size_t size)>>
    MapOfConversionsFromStandard<Unit::TemperatureDifference, NumericType>{
      {Unit::TemperatureDifference::Kelvin,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Kelvin>::
           FromStandard<NumericType>},
      {Unit::TemperatureDifference::Celsius,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Celsius>::
           FromStandard<NumericType>},
      {Unit::TemperatureDifference::Rankine,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Rankine>::
           FromStandard<NumericType>},
      {Unit::TemperatureDifference::Fahrenheit,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Fahrenheit>::
           FromStandard<NumericType>},
};
 
template <typename NumericType>
inline const std::map<Unit::TemperatureDifference,
                      std::function<void(NumericType* const values, const std::size_t size)>>
    MapOfConversionsToStandard<Unit::TemperatureDifference, NumericType>{
      {Unit::TemperatureDifference::Kelvin,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Kelvin>::
           ToStandard<NumericType>},
      {Unit::TemperatureDifference::Celsius,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Celsius>::
           ToStandard<NumericType>},
      {Unit::TemperatureDifference::Rankine,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Rankine>::
           ToStandard<NumericType>},
      {Unit::TemperatureDifference::Fahrenheit,
       Conversions<Unit::TemperatureDifference, Unit::TemperatureDifference::Fahrenheit>::
           ToStandard<NumericType>},
};
 
}  // namespace Internal
 
}  // namespace PhQ
 
#endif  // PHQ_UNIT_TEMPERATURE_DIFFERENCE_HPP