- Interval &y (){ return interval_a_[Y_AXIS]; }
- Interval x () const{ return interval_a_[X_AXIS]; }
- Interval y () const{return interval_a_[Y_AXIS]; }
- Interval operator[] (Axis a) const;
- Interval &operator[] (Axis a);
+ Interval &y () { return interval_a_[Y_AXIS]; }
+ Interval x () const { return interval_a_[X_AXIS]; }
+ Interval y () const {return interval_a_[Y_AXIS]; }
+ Interval operator [] (Axis a) const;
+ Interval &operator [] (Axis a);
+ Real area () const;
+ bool is_empty () const;
+ bool is_empty (Axis a) const;