CGAL users discussion list

[Michael Hoffmann <>]

> I'm trying to compute a convex hull with points in 2D that
> carry some "meta information" (e.g. two unsigned ints).
> 
> My first idea was to derive a class from Point_2 which has
> two addition member. However, this does not seem to work as
> I get a lengthy error message in IO/Tee_for_output_iterator.h,
> line 52 where CGAL tries to assign a Point_2 to my derived class.

Did you check the section "Extensible Kernel" in the manual? There is
an example...

http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Kernel_23/Chapter_main.html#Section_2.5

regards,
Michael