Talents with statefull traits will help you пт, 7 сент. 2018 г., 9:08 Marcus Denker <[email protected]>:
> > > On 6 Sep 2018, at 23:35, Petr Fischer via Pharo-users < > [email protected]> wrote: > > > *From: *Petr Fischer <[email protected]> > *Subject: **adding instance variables (data) to the Object class* > *Date: *6 September 2018 at 23:35:26 CEST > *To: *[email protected] > > > Hello! Weird question: why I can't add instance variables to the Object > class (for example "oid" or something else)? Is it due to some internal > (and different) VM "class layouts"? > > Or - can I inject my own information to all existing objects (any class)? > > > Behavior is a subclass of Object, too. So that means that you would add a > ivar to all the classes, but for the VM an object can only be a class that > has three ivars, and those > are accessed by offset. So if you add an ivar, you shift the offset —> > problem. > > As for “I want to add object specific state”: it would be nice to add an > easy to use (and efficient) mechanism to do it. > > Marcus >
