quantity.h

#ifndef QUANTITY_H
#define QUANTITY_H

#include "measurement-unit.h"

#include <string>

namespace fnss {

class Quantity {
public:
        Quantity(const double &value_, const std::string &unit_,
                                const MeasurementUnit &converter_);

        Quantity(const double &value_, const MeasurementUnit &converter_);

        Quantity(const std::string &str, const MeasurementUnit &converter_);

        Quantity(const MeasurementUnit &converter_);

        void fromString(const std::string &str);

        std::string toString(const std::string &separator="") const;

        void convert(const std::string &unit);

        double getValue() const;

        void setValue(const double &value);

        std::string getUnit() const;

        void setUnit(const std::string &unit);

        const MeasurementUnit& getMeasurementUnit() const;

        Quantity& operator=(const Quantity &other);

        bool operator<(const Quantity &other) const;

        bool operator<=(const Quantity &other) const;

        bool operator>(const Quantity &other) const;

         bool operator>=(const Quantity &other) const;

        bool operator==(const Quantity &other) const;

private:
        double value;   //The numerical value of the quantity.
        std::string unit;       //The measurement unit of the quantity.
        const MeasurementUnit &converter;       //The "type" of the unit, used for
                                                                                //comparisons and conversions.
};

} //namespace

#endif //QUANTITY_H