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The class Straight_skeleton_face_base_2<Refs> provides a model for the StraightSkeletonFace_2 concept which is the face type required by the StraightSkeleton_2 concept. The class Straight_skeleton_face_base_2<Refs> has only one template argument: the model of the StraightSkeleton_2 concept (the face container).
This class can be used as a base class allowing users of the straight skeleton data structure to decorate a face with additional data. The concrete face class must be given in the HalfedgeDSItems template parameter of the instantiation of the HalfedgeDS_default class used as the model for the Straight_skeleton_2 concept.
#include <CGAL/Straight_skeleton_face_base_2.h>