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[D Weterings <>]

Hello,

I'm currently trying to extend the DCEL of Arrangement_2: each vertex needs
to store a value (f.e. a double, but it is irrelevant to the question) that
is specific for each of its surrounding faces. Unless I'm missing something
this means I will need to extend the DCEL and store something like a vector
of pairs where each pair contains a double and a Face handle at each vertex.

A simplified example:

class VertexData
{
public:
        std::vector< std::pair<Face_const_handle, double> > data;
};

typedef CGAL::Arr_extended_dcel< Traits_2, VertexData > Dcel;

typedef CGAL::Arrangement_2<Traits_2, Dcel> Arrangement_2_ext;

The problem is that Face_const_handle seems to depend on the full definition
of Arrangement_2_ext, so C++ cannot know what type the Face_const_handle is?
I'll admit my C++ template knowledge is pretty bad, so perhaps there is a
solution I'm not aware of.

Instead of using the extended_vertex/face functionality perhaps I could
extend the vertex base class and then get the right Face_const_handle
definition? From the source files I've seen this didn't seem possible
either.

Thanks! 

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