CGAL 6.1 - 2D Voronoi Diagram Adaptor

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## Concepts
concept | AdaptationPolicy_2
| The concept `AdaptationPolicy_2` defines the requirements on the predicate functors that determine whether a feature of the triangulated Delaunay graph should be rejected or not. It also provides a functor for inserting sites in the Delaunay graph. The last functor is optional and a tag determines whether it is provided or not. Note that while the first two functors do not modify the Delaunay graph they take as an argument, the last ones does. More...
concept | AdaptationTraits_2
| The concept `AdaptationTraits_2` defines the functors required for accessing geometric information in the Delaunay graph that is needed by the `CGAL::Voronoi_diagram_2<DG,AT,AP>` class. It optionally defines a functor for performing nearest site queries. A tag is provided for determining whether this functor is defined or not. More...
concept | DelaunayGraph_2
| The concept `DelaunayGraph_2` defines the requirements for the first template parameter of the `Voronoi_diagram_2<DG,AT,AP>` class. The `DelaunayGraph_2` concept essentially defines the requirements that a class representing a Delaunay graph must obey so that the Voronoi diagram adaptor can adapt it. More...
concept | GraphicsSceneOptionsVoronoiDiagram2
| The concept `GraphicsSceneOptionsVoronoiDiagram2` defines data and methods used to tune the way that the cells of a `Voronoi_diagram_2` are considered for drawing or to be added into a graphics scene. More...