CGAL users discussion list

> I know have the explanation... The parameter P of your function app2, is a
> copy: the edges/facets/vertices of the original polyhedron are copied.
> When
> app2 returns, the returned handle is a handle to a facet of a temporary
> object.  After the return of app2, the copy is destroyed, and your
> variable
> fd is a handle to an already destroyed object.

Ok, it is a C++ mistake.

> I have attached your example, that I have constify to the most, maybe to
> much. :-)

Thank you.