🚀 go-pugleaf

Mark Hamburg writes:

> The canonical form for a frame handler in the Oberon system begins with a
> WITH on a pointer. (For example, see Reiser 19.4.1, p. 270.) One could

And that's the "wrong way" to do it.

I let Brian Hawley point out the "right way":

> PROCEDURE *Handle(o: Object; VAR msg: ObjectMsg);
> VAR f: Frame;
> BEGIN
>   f := o(Frame);
>   ... (* operations on f instead of o *)
> END Handle;

This is how I and many others here write their code. Maybe we should write a 'Fallacies and Pitfalls' page (with Oberon, it will only be one page :-) summing up those few problems that can occur in Oberon. (Maybe there already is such a document and I'm not aware of it...)

Regards,

  Stefan H-M Ludwig              mailto:ludwig@inf.ethz.ch
                                 http://www-cs.inf.ethz.ch/~ludwig
  Institute for Computer Systems
  Swiss Federal Institute of Technology (ETH)
  CH-8092 Zurich, Switzerland

  Phone: 41-1-632 7301
  Fax  : 41-1-632 1307