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Quoting "Guilherme Kunigami" 
<>:

> The following example constructs an arrangement with three circles:
>
> http://www.cgal.org/Manual/3.4/examples/Arrangement_on_surface_2/circles.cpp
>
> Then I used the code in 'examples/Arrangement_on_surface_2/arr_print.h' to
> print the arrangement. I'm interested in the output of the 'he->curve' in
> the code below (from arr_print.h):
>
> ===
>
> void print_ccb (Arrangement_2::Ccb_halfedge_const_circulator circ)
> {
>   Ccb_halfedge_const_circulator curr = circ;
>   std::cout << "(" << curr->source()->point() << ")";
>   do {
>     Arrangement_2::Halfedge_const_handle he = curr->handle();
>     std::cout << "   [" << he->curve() << "]   "
>               << "(" << he->target()->point() << ")";
>   } while (++curr != circ);
>   std::cout << std::endl;
> }
>
> ===
> 'cout << he->curve()' prints the circle to which the arc belongs and then
> the endpoints. I would like to extract such information from he->curve(). If
> I understood well, the return type of he->curve is
> 'Arrangement_2::X_monotone_curve_2', but I couldn't find the documentation
> for it.
>
> Could someone help me?

It is actually Traits::X_monotone_curve_2, where Traits is the type  
you used to instantiate your arrangement with, that is  
CGAL::Arr_circle_segment_traits_2<Kernel>. It is a model of  
ArrangementTraits_2 and there you can see some of the operations that  
apply to your curve.

> Thanks,
> --
> Guilherme Kunigami
> --
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