CGAL users discussion list

[Tapadi <>]

Hi,

I already encountered this kind of problems using vertex iteration over CGAL
Polyhedrons (in Mepp project). My near-newbie opinion after having worked on
this topic is :

- Handles and Circulators point both at samely-typed objects (vertices for
examples), so you may be able to compare them writing (*vc==*ne) instead of
(vc==ne).

- However, Handles and Circulators are not themselves objects of same
nature. I went to the conclusion that a Circulator is a special Iterator
with the additional property that the "next" member of the last item in a
Circulator is actually also the first item of the same Circulator, while it
is not true for any Iterator or Handle. Thus, I was able to cast Circulators
into less-specific Handles, but not reversely, as you noticed too. This must
be the same reason that you cannot compare directly Circulators and Handles
as (vc==ne) in your example.

Since I use CGAL without being an expert, please wait for a more skillful
member's help for a definitive answer. I would also be glad to know if my
own answer is correct or not.

Best regards,
Hugo Loi
PhD student at Inria - Maverick Team
http://maverick.inria.fr/



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