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Requirements for Vertex_base

Definition

A vertex optionally stores a point and a reference to an incident halfedge that points to the vertex. Type tags indicate whether these member functions are supported. Figure  reference arrow depicts the relationship between a halfedge and its incident halfedges, vertices, and facets.

Types

Type for (optional) associated geometry. If a point is not supported the type is void*.

Vertex_base::Point
point type stored in vertices.

Creation

Vertex_base v;
default constructor.

Vertex_base v ( const Vertex&);
copy constructor.

Vertex_base v ( const Point& p);
must exists if points are supported.

Operations

void* v.halfedge () an incident halfedge pointing towards v.
const void* v.halfedge () const
Point& v.point () the point.
const Point& v.point () const
void v.set_halfedge ( void* h)
set incident halfedge.

Types for Tagging Optional Features

The following types are equal to either CGAL_Tag_true or CGAL_Tag_false, depending on whether the named member function is supported or not.

Vertex_base::Supports_vertex_point
point().

Vertex_base::Supports_vertex_halfedge
halfedge().

Next: Class declaration of Halfedge_base
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The CGAL Project. 22 January, 1999.