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Quoting Sterpa 
<>:

> I'm trying to do this
>
> if(!e.vertex().boundary_in_x()) { ... }

The method is called parameter_space_in_x (). Besides, it's a bit  
surprising that you are using the "." operator and not the '->'  
operator.

> and I get this 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
> arrangement.cpp:214: error: request for member ‘boundary_in_x’ in
> ‘e.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>
> > > >]()’, which is of non-class type
> ‘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>*’
> make: *** [arrangement.o] Error 1
>
> Does anybody know a way to solve this issue?--
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