void PM_io_parser<PMDEC>::debug() const
{
  out << "\nDEBUG Plane_map\n"
      << "Vertices:  " << this->number_of_vertices() << "\n"
      << "Halfedges: " << this->number_of_halfedges() << "\n";
  Vertex_iterator vit,vend = this->vertices_end();
  for( vit = this->vertices_begin(); vit != vend; ++vit ) {
    if ( is_isolated(vit) ) continue;
    typename Base::Halfedge_around_vertex_circulator
      hcirc = out_edges(vit), hend = hcirc;
    debug_vertex(vit);
    CGAL_For_all(hcirc,hend) { out << "  "; debug_hedge(hcirc); }
  }
  out << std::endl;
}
void PM_io_parser<PMDEC>::debug() const
{
  out << "\nDEBUG Plane_map\n"
      << "Vertices:  " << this->number_of_vertices() << "\n"
      << "Halfedges: " << this->number_of_halfedges() << "\n";
  Vertex_iterator vit,vend = this->vertices_end();
  for( vit = this->vertices_begin(); vit != vend; ++vit ) {
    if ( is_isolated(vit) ) continue;
    typename Base::Halfedge_around_vertex_circulator
      hcirc = out_edges(vit), hend = hcirc;
    debug_vertex(vit);
    CGAL_For_all(hcirc,hend) { out << "  "; debug_hedge(hcirc); }
  }
  out << std::endl;
}