Temperature.h

/***************************************************************************
 *   Copyright (C) 2023 by Stefan Kebekus                                  *
 *   stefan.kebekus@gmail.com                                              *
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 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
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 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
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 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
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 ***************************************************************************/
 
#pragma once
 
#include <QObject>
#include <QQmlEngine>
#include <QtMath>
 
 
namespace Units {

class Temperature {
    Q_GADGET
    QML_VALUE_TYPE(temperature)
 
public:
    static constexpr auto fromDegreeCelsius(double temperatureInDegreeCelsius) -> Temperature
    {
        Temperature result;
        result.m_temperatureInDegreeKelvin = temperatureInDegreeCelsius+273.15;
        return result;
    }

    static constexpr auto fromDegreeFarenheit(double temperatureInDegreeFarenheit) -> Temperature
    {
        Temperature result;
        result.m_temperatureInDegreeKelvin = (temperatureInDegreeFarenheit - 32.0)*5.0/9.0 + 273.15;
        return result;
    }

    static constexpr auto fromDegreeKelvin(double temperatureInDegreeKelvin) -> Temperature
    {
        Temperature result;
        result.m_temperatureInDegreeKelvin = temperatureInDegreeKelvin;
        return result;
    }

    [[nodiscard]] Q_INVOKABLE bool isFinite() const
    {
        return std::isfinite(m_temperatureInDegreeKelvin);
    }

    [[nodiscard]] Q_INVOKABLE std::partial_ordering operator<=>(const Units::Temperature& rhs) const = default;

    [[nodiscard]] Q_INVOKABLE double toDegreeCelsius() const
    {
        return m_temperatureInDegreeKelvin-273.15;
    }

    [[nodiscard]] Q_INVOKABLE double toDegreeFarenheit() const
    {
        return (m_temperatureInDegreeKelvin - 273.15)*9.0/5.0 + 32.0;
    }

    [[nodiscard]] Q_INVOKABLE double toDegreeKelvin() const
    {
        return m_temperatureInDegreeKelvin;
    }
 
 
private:
    // temperature in Pascal
    double m_temperatureInDegreeKelvin{ NAN };
};
} // namespace Units
 
auto operator<<(QDataStream &out, Units::Temperature t) -> QDataStream &;
auto operator>>(QDataStream &in, Units::Temperature &t) -> QDataStream &;
 
// Declare meta types
Q_DECLARE_METATYPE(Units::Temperature)