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CGAL::opposite

#include <CGAL/functions_on_enums.h>

Oriented_side opposite ( Oriented_side o) returns the opposite side (for example ON_POSITIVE_SIDE if o==ON_NEGATIVE_SIDE), or ON_ORIENTED_BOUNDARY if o==ON_ORIENTED_BOUNDARY.

Bounded_side opposite ( Bounded_side o) returns the opposite side (for example BOUNDED_SIDE if o==UNBOUNDED_SIDE), or returns ON_BOUNDARY if o==ON_BOUNDARY.
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CGAL Open Source Project. Release 3.3.1. 25 August 2007.