- CurveSet operator &(const CurveSet &rhs) const; //intersect
- CurveSet operator |(const CurveSet &rhs) const; //union
- CurveSet operator -(const CurveSet &rhs) const; //subtract
+ CurveSet operator&(const CurveSet &rhs) const; //intersect
+ CurveSet operator|(const CurveSet &rhs) const; //union
+ CurveSet operator-(const CurveSet &rhs) const; //subtract