unitconvertor.h

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#ifndef UNITCONVERTOR_H
#define UNITCONVERTOR_H

class UnitConvertor
{
public:
    UnitConvertor();
    UnitConvertor(const double &factor, const double &offset);
    double operator()(const double &input) const ;
    void reset();
    const bool &isValid() const ;

protected:
    double factor;
    double offset;
    bool valid;
};

class SqlUnitConvertor : public UnitConvertor
{
public:
    SqlUnitConvertor(const int db_unit_id_from, const int db_unit_id_to);
};

#endif // UNITCONVERTOR_H