#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Arr_segment_traits_2.h>
#include <CGAL/Arrangement_2.h>
#include <vector>

typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef CGAL::Arr_segment_traits_2<Kernel>            Traits_2;
typedef Traits_2::Point_2                             Point_2;
typedef Traits_2::X_monotone_curve_2                  Segment_2;
typedef CGAL::Arrangement_2<Traits_2>                 Arrangement_2;
int main ()
{
  // Construct the arrangement of five intersecting segments.
  Arrangement_2 arr;
  std::vector<Segment_2> segments;
  segments.push_back(Segment_2(Point_2(1, 0), Point_2(2, 4)));
  segments.push_back(Segment_2(Point_2(5, 0), Point_2(5, 5)));
  segments.push_back(Segment_2(Point_2(1, 0), Point_2(5, 3)));
  segments.push_back(Segment_2(Point_2(0, 2), Point_2(6, 0)));
  segments.push_back(Segment_2(Point_2(3, 0), Point_2(5, 5)));
  insert(arr, segments.begin(), segments.end());

  Arrangement_2::Face_handle fh = arr.unbounded_face();
  for(Arrangement_2::Hole_iterator hole_it = fh->holes_begin();
                                   hole_it != fh->holes_end();
                                   ++hole_it)
  {
    Arrangement_2::Halfedge_handle h = *hole_it, start=h;
    do{
        std::cout << h->target()->point();
      h=h->next();
    }while(start!=h);
  }

  return 0;
}