CGAL 4.7 - 2D Triangulation
TriangulationHierarchyVertexBase_2 Concept Reference

## Definition

The vertex of a triangulation included in a triangulation hierarchy has to provide some pointers to the corresponding vertices in the triangulations of the next and preceding levels. Therefore, the concept TriangulationHierarchyVertexBase_2 refines the concept TriangulationVertexBase_2, adding handles to the corresponding vertices in the next and previous level triangulations.

Refines:
TriangulationVertexBase_2
Has Models:
CGAL::Triangulation_hierarchy_vertex_base_2<Vb>
CGAL::Triangulation_hierarchy_2<Tr>

## Operations

Vertex_handle up ()
returns the corresponding vertex (if any) of the next level triangulation.

Vertex_handle down ()
returns the corresponding vertex of the previous level triangulation.

void set_up (Vertex_handle u)
sets the handle pointing to to the corresponding vertex of the next level triangulation.

void set_down (Vertex_handle d)
sets the handle pointing to the corresponding vertex of the previous level triangulation.