On Fri, Mar 2, 2018 at 9:19 PM, Hernán Morales Durand < hernan.morales@gmail.com> wrote:
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? cheers Siemen Cheers,
Hernán
2018-03-02 15:45 GMT-03:00 Siemen Baader <siemenbaader@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- object-to-a-subclass-td4239041.html
But I (think) I need it - I'm transforming a DOM tree from XMLHTMLParser's XMLElement s to a subclass of Iliad's ILHTMLBuilderElement s, and for single occurences I would like to use the more specific subclasses, like ILCheckboxElement. I can make the cast manually, I know when it is safe to 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