Re: [Help-smalltalk] Is there a hook (a method) which is called, if the vm ends?

[Paolo Bonzini]

> I tried it and found out (for me) that "ObjectMemory addDependent: self"
> should be send in a class-method of "self". (in the case, that I did
> that from an Object-method, nothing happens.) -> and so I found it in
> the kernel/*.st files also.
>
> Even #update: has to be a class method.

No, it does not need to be.  Of course whatever is passed to 
#addDependent: (self can be either a class or an instance) should match 
the place where you define #update: (class or instance)

> But if I did it, I always get a MessageNotUnderstood Exception...
> (Would it be an idea, to maintain an OrderedCollection in the class with
> all the instances of this class, to iterate over all these in the case,
> the #update: class-method is getting the #aboutToQuit?)

If the above does not work, you can use a WeakSet instead.  If you use 
an OrderedCollection nothing will be garbage collected---but then maybe 
that is okay for you?

Strange that you get a doesNotUnderstand though.

An aside: all instance methods of Objects are also available as class 
methods.  That's because Object is a superclass of Behavior, which is a 
superclass of Class, which is a superclass of Object class, which is 
where class methods are defined in.  Dually, there is actually no method 
in Object class, or maybe almost none; class methods for Object are 
defined in Behavior and its subclasses.

Paolo