Angle.h

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#ifndef HRK_ANGLE_H
#define HRK_ANGLE_H

namespace hrk
{
    class Angle
    {
        friend Angle deg(double degree);
        friend Angle rad(double radian);

    public:
        Angle(void);

        double to_deg(void) const;

        void set_deg(double degree);

        double to_rad(void) const;

        void set_rad(double radian);

        bool operator != (const Angle& rhs) const;
        bool operator == (const Angle& rhs) const;

        Angle& operator += (const Angle& rhs);

        const Angle operator + (const Angle& rhs) const;

        Angle& operator -= (const Angle& rhs);

        const Angle operator - (const Angle& rhs) const;

        Angle operator - (void) const;

        Angle& operator *= (const double rhs);

        Angle operator * (const double rhs) const;

        friend const Angle operator * (const double lhs, const Angle& rhs);

    private:
        double radian_;
    };

    extern Angle deg(double degree);

    extern Angle rad(double radian);
}

#endif