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> Can you send us a *complete* little program, with the headers inclusions
> and
> your typedefs?

Sorry...


#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>

typedef CGAL::Exact_predicates_inexact_constructions_kernel  Kernel;
typedef Kernel::Point_3                                 Point_3;
typedef CGAL::Polyhedron_3<Kernel>      Polyhedron;
typedef Polyhedron::Facet_handle        Facet_handle;
typedef Polyhedron::Vertex_handle               Vertex_handle;
typedef Polyhedron::Halfedge_handle             Halfedge_handle;

Facet_handle app2( Polyhedron P){
        return P.facets_begin();}

int main() {
        Polyhedron P;
        Point_3 p1(0,0,0), p2(0,0,1), p3(0,1,0), p4(1,0,0);
        P.make_tetrahedron(p1,p2,p3,p4);
        Vertex_handle vh1 = P.facets_begin()->halfedge()->vertex();
        Facet_handle fd = app2(P);
        Halfedge_handle hh = fd->halfedge();
        std::cerr << "All is ok." << std::endl;
        Vertex_handle vh2 = fd->halfedge()->vertex(); //segmentation fault
    return 0;}