I have to program a class A whose method m produces an object of class
B,with the property that B inherits from A :

class A =
...
method m = new B
...
end;;

class B =
...
inherit A
...
end;;

Of course it leads to a type clash, but as the manual exhibits an
example of the observer/notifier
problem, if someone could explain me a little more about a trick to get
the behaviour i need, it would be very kind !!

PS : sorry for my poor english, and no i can not change my architecture
of classes cause i interface an existing API (for those who are
interested, it is the architecture of the BHandler/BLooper in BeOS)


-- 
Sylvain Kerjean
IRISA-INRIA, Campus de Beaulieu, 35042 Rennes cedex, France
Tél: +33 (0) 2 99 84 75 99, Fax: +33 (0) 2 99 84 71 71