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[Sterpa <>]

I've tried also this:
void algorithm_2(vector<Line_2> lines, int k) {
        CGAL::Geomview_stream gv(CGAL::Bbox_3(-100, -100, -100, 600, 600,
600));
        gv.set_line_width(2);
        gv.set_bg_color(CGAL::WHITE);
        gv.set_face_color(CGAL::BLACK);
        gv.set_vertex_radius(5);
        
        Arrangement_2 arr = getArrangement(lines);
        Edge_iterator ei;
        vector<Halfedge> levels[lines.size()];

       for(ei = arr.edges_begin(); ei != arr.edges_end(); ei++) {
               int i = getLevel(*ei, lines);
              levels[i].push_back(*ei);
}

int getLevel(Halfedge e, vector<Line_2> lines) {
        int k = 0;
        double x;
        e.vertex();

        ........
}

and I get the following error:

/usr/local/include/CGAL/Arrangement_on_surface_2.h: In function ‘int
getLevel(Halfedge, std::vector<CGAL::Line_2<CGAL::Simple_cartesian<double> >,
std::allocator<CGAL::Line_2<CGAL::Simple_cartesian<double> > > >)’:
/usr/local/include/CGAL/Arrangement_on_surface_2.h:736: error: ‘typename
TopTraits_::Dcel::Vertex* CGAL::Arrangement_on_surface_2<GeomTraits_,
TopTraits_>::Halfedge::vertex() [with GeomTraits_ =
CGAL::Arr_linear_traits_2<CGAL::Simple_cartesian<double> >, TopTraits_ =
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 private
arrangement.cpp:214: error: within this context

It seems I cannot access the method vertex() of the halfedge structure, so I
can proceed with this?