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    CGAL 4.7 - 2D Straight Skeleton and Polygon Offsetting 
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#include <CGAL/Straight_skeleton_2.h>
CGAL::HalfedgeDS_vector< Traits, Items, Alloc >.
The class Straight_skeleton_2 provides a model for the StraightSkeleton_2 concept which is the class type used to represent a straight skeleton. 
The only purpose of this class is to protect all the modifying operations in a HalfedgeDS. Normal users should not modify a straight skeleton. If an advanced user needs to get access to the modifying operations, it must call the required methods through the Base class.