CGAL users discussion list

If I have a OFF file. For exemple :
OFF
4 2 0

x0 y0 z0
x1 y1 z1
x2 y2 z2
x3 y4 z4

3  0 1 2
3  0 3 1

(two triangles which have a edge in common)


If then, I construct a Polyhedron with an incremental builder,

for i from 1 to 4
  B.add_vertex( point i );

  begin facet
    B.add_vertex_to_facet( 0);
    B.add_vertex_to_facet( 1);
    B.add_vertex_to_facet( 2);
  end facet
  begin facet
    B.add_vertex_to_facet( 0);
    B.add_vertex_to_facet( 3);
    B.add_vertex_to_facet( 1);
  end facet

( it's what cgal operator >> do for polyhedron )

Can I be sure that with 
for ( it=P.vertices_begin(); it!=P.vertices_end(); ++it)
  ...
  it->vertex()
  ...
the vertices are in the same order as in the off file ?

and if f is a facet
Halfedge_around_facet_circulator ci = f->facet_begin()
do
{
  ...
  ci->vertex()->point()
  ...
} while ( ++ci != fit->facet_begin() );
Can I be sure that the vertices are in same order as in 
the indices list of the off file.

I tried and it seems to be true. Always ?
Else what can I do ?