On Fri, Mar 2, 2018 at 9:19 PM, Hernán Morales Durand <
> Hi Siemen
> IIRC this was known as "wide classes", there is some paper about it.
Thanks for the pointer! I found
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.31.4708 but no
Pharo implementation. Was it available in Pharo at some point?
> 2018-03-02 15:45 GMT-03:00 Siemen Baader <siemenbaa...@gmail.com>:
> > Hi all,
> > it seems like we cannot cast the class of object to its subclass if that
> > subclass has had new instance variables added to it:
> > http://forum.world.st/changing-the-class-of-an-existing-
> > But I (think) I need it - I'm transforming a DOM tree from
> > XMLElement s to a subclass of Iliad's ILHTMLBuilderElement s, and for
> > occurences I would like to use the more specific subclasses, like
> > ILCheckboxElement. I can make the cast manually, I know when it is safe
> > do.
> > What else could I do, apart from removing the element from its tree,
> > creating a new (subclass) instance and then putting this element in
> place of
> > the old one? Some #perform or `super` magic..?
> > hm..
> > thanks for any pointers!
> > -- Siemen