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[Flaminigo <>]

I use
 Voronoi_diagram_2<DG,AT,AP>::Face::Halfedge to traverse the edges on a face
of VD.

However, I can only know whether this edge is a segment or a ray or a line
by testing has_source() or has_target(). If it is a ray, I cannot get its
direction. Meanwhile, I cannot convert it to be a ray object. Is there any
straight or simple method to convert the ray in VD to be a ray object?

Thanks very much
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