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[Lionel <>]

Hello Andreas,

Thanks for your answer.
I only created a Constrained_Delaunay_triangulation_2 object. So I guess that 
I
can not use functions of a Triangulation Plus object (i did not read
documentation about it) ?

I use an object with this type and like this (for example):
typedef CGAL::Constrained_Delaunay_triangulation_2<K, TDS, Itag> CDT;
CDT m_cdt;
bool c = m_cdt.is_constrained(CDT::Edge(fh, noVertex));
if (c) m_cdt.remove_constrained_edge(fh, noVertex);

Maybe the problem comes from the constraint insertion  ? :
for (VectorPoint::iterator itv = vline.begin()  ; (itv+1) != vline.end();
++itv)
{
  vha = m_cdt.insert((*itv).point());
  vhb = m_cdt.insert((*(itv+1)).point());

  m_cdt.insert_constraint(vha, vhb);
}
I do like this because I need (vha, vhb) to traverse the polygon later.

I did many tries before posting using several iterators (all_edges,
finite_edges, etc) to search and test the constraint and several containers
(list or set) to store the edges to delete, etc. And I did not find something
working ; only my workaround...

Lionel

Here are the full type definitions that I use :
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Triangulation_vertex_base_with_info_2<MesInfosVertex, K> VbInfo;
typedef CGAL::Constrained_triangulation_face_base_2<K> Fb_Base;
typedef CGAL::Triangulation_face_base_with_info_2<MesInfosFace,K,Fb_Base>
FbInfo;
typedef CGAL::Triangulation_data_structure_2<VbInfo,FbInfo> TDS;
typedef CGAL::Exact_intersections_tag Itag;
typedef CGAL::Constrained_Delaunay_triangulation_2<K, TDS, Itag> CDT;