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    CGAL 4.7 - 2D Straight Skeleton and Polygon Offsetting 
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#include <CGAL/Straight_skeleton_builder_2.h>
The class Dummy_straight_skeleton_builder_2_visitor provides a model for the StraightSkeletonBuilder_2_Visitor concept which is the visitor type required by the StraightSkeletonBuilder_2 concept. 
The class Dummy_straight_skeleton_builder_2_visitor has only one template argument: a model of the StraightSkeleton_2 concept.
This class is the default visitor parameter of the straight skeleton builder. All its methods are empty.
CGAL::Straight_skeleton_builder_2<Gt,Ss,Visitor>