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The class Triangulation_ds_vertex_base_2 can be used as the base vertex for a Triangulation_data_structure_2, it is a model of the concept TriangulationDSVertexBase_2.
This base class can be used directly or can serve as a base to derive other base classes with some additional attributes (a color for example) tuned for a specific application.
Note that if the Triangulation_data_structure_2 is used as a parameter of a geometric triangulation, there are additional geometric requirements to be fulfilled by the vertex base class, and Triangulation_ds_vertex_base_2 cannot be plugged in.
#include <CGAL/Triangulation_ds_vertex_base_2.h>
CGAL::Triangulation_vertex_base_2<Traits,Vb>
CGAL::Triangulation_ds_face_base_2<Tds>