On Fri, Mar 2, 2018 at 9:19 PM, Hernán Morales Durand < hernan.mora...@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 <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- > 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 > >
