Arrangement_on_surface_2/include/CGAL/Arr_dcel_base.h
/*! Obtain a halfedge along the component (non-const version). */
Obtain a halfedge along the component (non-const version).
Obtain a halfedge along the component ( non - const version ) .
Halfedge* halfedge()
  {
    CGAL_assertion(is_valid());
    return (*iter);
  }
Halfedge * halfedge ( ) { CGAL_assertion ( is_valid ( ) ) ; return ( * iter ) ; }
Obtain a halfedge along the component (non-const version).
Obtain a halfedge along the component ( non - const version ) .