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The concept StraightSkeleton_2 describes the requirements for the data structure used to represent a straight skeleton.
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A model of the StraightSkeletonVertex_2 concept used to represent the vertices of the straight skeleton
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A model of the StraightSkeletonHalfedge_2 concept used to represent the halfedges of the straight skeleton
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Any model of the HalfedgeDSFace concept
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CGAL::Straight_skeleton_2<Traits,Items,Alloc>.
This concept explicitly protects all the modifying operations of the base HalfedgeDS concept. Only the algorithm classes, or clients explicitly bypassing the protection mechanism, can modify a straight skeleton.