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[cnng0315 <>]

I have a Delaunay, and want to delete some face in it. but when I do other
operations on this Delaunay, it crashes. 

std::list<Delaunay::Face_handle> lstFaces;
                for (Delaunay::Finite_faces_iterator fit = 
dt.finite_faces_begin(); fit !=
dt.finite_faces_end(); fit ++)
                {
                        /// check the face has small angle
                        if (hasSmallAngle(fit))
                        {
                                lstFaces.push_back(fit);
                        }
                }
                std::list<Delaunay::Face_handle>::iterator iterS = 
lstFaces.begin();
                for (;iterS!=lstFaces.end();++iterS)
                {
                        dt.delete_face(*iterS);
                }

after executing the codes above , I do the following:

Delaunay::Vertex_handle cw = hNextFace->vertex(dt.cw(i));
                        Delaunay::Vertex_handle cww = 
hNextFace->vertex(dt.ccw(i));
                        if (!dt.is_edge(cw,cww)) 
 /*// crash here*/

                        {
                                continue;
                        }



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