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[cocorico <>]

I am trying to construct an counterclockwise edge iterator over the
boundaries of each face in my voronoi diagram.  I do this by the following
code; note that vd is a Voronoi_diagram_2 object:


for (Face_iterator fit = vd.faces_begin(); fit != vd.faces_end(); ++fit) {
     Ccb_halfedge_circulator ccb_start = fit -> outer_ccb();
     Ccb_halfedge_circulator hc = ccb_start;
     do {
           ...
           ++hc;
     } while (hc != ccb_start)
}

Strangely, this code runs smoothly compiled under Debug mode of XCode, but
when I compile under Release mode, I get an error at the boldfaced line
above, which terminates my program with a SIGABRT.  Using the debug tool in
XCode, I found that ultimately what is causing the SIGABRT is a precondition
fail in the file Triangulation_ds_face_base_2.h:

template <class TDS>
inline 
typename Triangulation_ds_face_base_2<TDS>::Vertex_handle
Triangulation_ds_face_base_2<TDS>::
vertex(int i) const
{
  CGAL_triangulation_precondition( i == 0 || i == 1 || i == 2);
  return V[i];
} 

I do not understand why this precondition fails when I compile my code in
Release mode, and why it does not fail when I compile it in Debug mode.

Any advice would be greatly appreciated!
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