Re: [Help-smalltalk] Code update and class variables

[Paolo Bonzini]

On 09/06/2010 11:46 AM, Holger Hans Peter Freyther wrote:
> On 09/06/2010 04:30 PM, Paolo Bonzini wrote:
> > It's a bit ugly, but not strictly a bug.  I suggest you use a
> > dictionary, and #doesNotUnderstand: instead of a getter, especially
> > because you're adding the instance variables to _all_ instances of
> > LogConfig rather than just one.
>
> Two more questions
>
> 1.) is it possible to only add instance variables only to one instance? How
> would I do it? '123' addInstVarNamed didn't work here.

You need to create a "lightweight class", like

   | cl |
   cl := Behavior new.
   cl superclass: instance class.
   instance changeClassTo: cl.
   cl addInstVarNamed: 'a'.

However, it's broken and only works if "instance class" has no instance 
variables at all.  I'll shortly push a fix.

> 2.) #doesNotUnderstand will not work from what I see as the Logging Module
> does not know who is going to add areas to it, unless I do something like
> LogConfig allSubClassesDo: []... is that appropriate?

I don't understand why would you subclass LogConfig rather than create 
multiple instances?

Paolo