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[Graviton <>]

I have two 
http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Arrangement_2/Chapter_main.html
arrangement  objects, and need to carry out a
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Boolean_set_operations_2_ref/Function_difference.html
 
difference operation   between these two objects. I will use overlay for
this purpose.

For the output of the overlay, I would need to know, for each edge, what are
the original face/vertex from the original two arrangements that are
assigned to it. I understand that I might need to use 
http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Arrangement_2_ref/Concept_OverlayTraits.html#Cross_link_anchor_812
overlay traits  ( in particular, the create_edge function) to do, but I am
not too sure how to start/ how to carry on.

Is there an example that shows how to do this?

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