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[Sterpa <>]

I'm trying to compile this line:

if(e.target().is_at_infinity()) x = e.target().point().x()-1;

and get this error:

CGAL::I_Filtered_iterator<CGAL::CGALi::In_place_list_iterator<CGAL::Arr_vertex<CGAL::Arr_vertex_base<CGAL::Point_2<CGAL::Simple_cartesian<double>
> >,
CGAL::Arr_halfedge_base<CGAL::Arr_linear_object_2<CGAL::Simple_cartesian<double>
> >, CGAL::Arr_face_base>,
std::allocator<CGAL::Arr_vertex<CGAL::Arr_vertex_base<CGAL::Point_2<CGAL::Simple_cartesian<double>
> >,
CGAL::Arr_halfedge_base<CGAL::Arr_linear_object_2<CGAL::Simple_cartesian<double>
> >, CGAL::Arr_face_base> > >,
CGAL::Arrangement_on_surface_2<CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double>
>,
CGAL::Arr_unb_planar_topology_traits_2<CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double>
>,
CGAL::Arr_default_dcel<CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double>
> > > >::_Is_concrete_vertex,
CGAL::Arrangement_on_surface_2<CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double>
>,
CGAL::Arr_unb_planar_topology_traits_2<CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double>
>,
CGAL::Arr_default_dcel<CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double>
> > > >::Vertex, int, std::bidirectional_iterator_tag>’ has no member named
‘is_at_infinity’

I read that this method has been replaced by is_at_open_boundary(), but I've
not found a way to write the equivalent statement without get some kind of
error. How can I solve it?

Thanks in advance. Best regards.