| CGAL 6.1 - 2D Apollonius Graphs (Delaunay Graphs of Disks)
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#include <CGAL/Apollonius_graph_vertex_base_2.h>
Vb.
The class Apollonius_graph_vertex_base_2 provides a model for the ApolloniusGraphVertexBase_2 concept which is the vertex base required by the ApolloniusGraphDataStructure_2 concept. 
The class Apollonius_graph_vertex_base_2 has three template arguments.
| Gt | is the geometric traits of the Apollonius graph and must be a model of the concept ApolloniusGraphTraits_2. | 
| StoreHidden | is a Boolean which controls whether hidden sites are actually stored. Such a control is important if the user is not interested in hidden sites and/or if only insertions are made, in which case no hidden site can become visible. If StoreHiddenis set totrue, hidden sites are stored, otherwise they are discarded. By defaultStoreHiddenis set totrue. | 
| Vb | must be a model of the concept TriangulationDSVertexBase_2By default this parameter is instantiated byTriangulation_ds_vertex_base_2<>. | 
ApolloniusGraphVertexBase_2