CGAL 5.0 - 2D Straight Skeleton and Polygon Offsetting
StraightSkeleton_2 Concept Reference

## Definition

The concept StraightSkeleton_2 describes the requirements for the data structure used to represent a straight skeleton. It refines the concept HalfedgeDS and adds additional requirements on the nested types Vertex, Halfedge, and Face of the halfedge data structure.

Refines:
HalfedgeDS
Has Models:
CGAL::Straight_skeleton_2
Attention
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.

## Types

typedef unspecified_type Vertex
A model of the StraightSkeletonVertex_2 concept used to represent the vertices of the straight skeleton.

typedef unspecified_type Halfedge
A model of the StraightSkeletonHalfedge_2 concept used to represent the halfedges of the straight skeleton.

typedef unspecified_type Face
Any model of the StraightSkeletonFace_2 concept used to represent the faces of the straight skeleton.