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% | Reference manual page: Triangulation_hierarchy_vertex_base.tex
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% | 16.08.2000   Author
% | Package: Package
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\RCSdef{\RCSTriangulationhierarchyvertexbaseRev}{$Id$}
\RCSdefDate{\RCSTriangulationhierarchyvertexbaseDate}{$Date$}
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\begin{ccRefConcept}{TriangulationHierarchyVertexBase_2}

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\ccDefinition 
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 \ccc{TriangulationHierarchyVertexBase_2}
refines the concept \ccc{TriangulationVertexBase_2},
adding handles to the corresponding vertices in the
next and previous level triangulations.



\ccRefines
\ccc{TriangulationVertexBase_2}



\ccCreationVariable{v}  %% choose variable name

\ccOperations
\ccThree{Vertex_handle}{v.set_down(Vertex_handle d)x;}{}
\ccMethod{Vertex_handle  up();}{returns the corresponding vertex
(if any) of the next level triangulation;}
\ccGlue
\ccMethod{Vertex_handle  down();}{returns the corresponding vertex
 of the previous level triangulation;}
\ccGlue
\ccMethod{void set_up(Vertex_handle u);}
{sets the handle pointing to  to the corresponding vertex
of the next level triangulation;} 
\ccGlue 
\ccMethod{void set_down(Vertex_handle d);}
{sets the handle pointing  to the corresponding vertex
of the previous level triangulation;}

\ccHasModels
\ccc{CGAL::Triangulation_hierarchy_vertex_base_2<Vb>}

\ccSeeAlso
\ccc{Triangulation_hierarchy_2<Tr>} 


\end{ccRefConcept}

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