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[Vincent Rouvreau <>]

Replace your piece of code (after //i'm not sure if this is the correct way
to access the filtration) with:
  std::list<CGAL::Object>       objects;
  as.filtration(std::back_inserter(objects));
  std::cout << "filtration returns : " << objects.size() << " objects" <<
std::endl;
  std::list<CGAL::Object>::iterator pos;
  pos = objects.begin();
  while (pos != objects.end()){
          pos++;
  }


You can see with as.get_alpha_shape_cells/facets/edges that your alpha shape
has been modified.
For filtration_with_alpha_values, you can try something like this :
  std::vector<CGAL::Object> the_objects;
  std::vector<Alpha_shape_3::FT> the_ft;

  typedef CGAL::Dispatch_output_iterator<
    CGAL::cpp11::tuple<CGAL::Object, Alpha_shape_3::FT>,
    CGAL::cpp11::tuple<std::back_insert_iterator&lt;
std::vector&lt;CGAL::Object> >,
                       std::back_insert_iterator<
std::vector<Alpha_shape_3::FT> >
                       > > Dispatch;

  Dispatch disp = CGAL::dispatch_output<CGAL::Object, Alpha_shape_3::FT>(
    std::back_inserter(the_objects),
    std::back_inserter(the_ft));

  as.filtration_with_alpha_values(disp);


You can see with as.get_alpha_shape_cells/facets/edges that your alpha shape
has been modified.

Hope this can help,
Regards 



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