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I have a polyhedron P.
And I want to associate to each face an index : the distance from
P->facets_begin() to the iterator pointing to the face (for example).

Now, given a halfedge h, I would like to know the number of h.facets().
I tried std::distance(P.facets_begin(), h.facets()) but it doesn't work
since one is an iterator and the other a handle.

Is there a simple way to do that ?