CGAL::Dual< Primal_ > Class Template Reference

#include <CGAL/boost/graph/Dual.h>

Definition

template<typename Primal_>
class CGAL::Dual< Primal_ >

The class template Dual is an adaptor that creates the dual view of a FaceGraph. Faces of the original graph correspond to vertices in the Dual and vice versa.

Note that border edges in a Dual have the null_face of the original graph as either source or target. This is unusual and might break other algorithms since edges are always assumed to have non-null vertices as a source and target. It is possible to filter border edges using boost::filtered_graph as shown in example BGL_surface_mesh/surface_mesh_dual.cpp

Property Forwarding

Advanced

Edge properties of the underlying graph are forwarded directly. For faces and vertices only the face_index and vertex_index properties are forwarded. Accessing other properties will lead to a compilation error.

Template Parameters

Primal_

must be a model of FaceGraph

Is Model Of:

FaceGraph

Examples

BGL_arrangement_2/arrangement_dual.cpp, and BGL_surface_mesh/surface_mesh_dual.cpp.

Public Types
typedef Primal_	Primal
	The underlying primal type.

Public Member Functions
	Dual (const Primal &primal)
	Construct a Dual from a given primal.
const Primal &	primal () const
	Returns the underlying primal.

Related Functions
(Note that these are not member functions.)
template<typename Primal >
Dual< Primal >	dual (const Primal &primal)
	Construct a Dual from a given primal.