\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - 2D Straight Skeleton and Polygon Offsetting

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StraightSkeletonFace_2 Concept Reference
Concepts

## Definition

The concept `StraightSkeletonFace_2` describes the requirements for the face type of the `StraightSkeleton_2` concept. It is a refinement of the `HalfedgeDSFace` concept with support for storage of the incident halfedge.

Refines:
  `HalfedgeDSFace`

Has Models:
  CGAL::Straight_skeleton_face_base_2

See Also
  `StraightSkeleton_2`
  `CGAL::Straight_skeleton_face_base_2<Refs>`
  `CGAL::Straight_skeleton_vertex_base_2<Refs,Point,FT>`
  `CGAL::Straight_skeleton_halfedge_base_2<Refs>`

## Creation
| StraightSkeletonFace_2 ()
| Default constructor.
| StraightSkeletonFace_2 (int id)
| Constructs a face with ID number `id`

## Access Functions
int | id () const
| The ID of the face.