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CGAL 4.8 - 2D Triangulation

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TriangulationHierarchyVertexBase_2 Concept Reference
Concepts

## 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>`

See Also
  `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.