so is there a fix? Stef
On Jun 4, 2009, at 11:07 PM, Hernan Wilkinson wrote: > yes, but not only that... I also create "complete objects" from its > very first time. For example, instead of: > Date new day:1; moth:1; year: 2009. > I do: > Date newDay: 1 moth: 1 year: 2009. > > That way you will never have an invalid Date > > 2009/6/4 Steve Wirts <[email protected]> > That's the Null Object Pattern! > > http://en.wikipedia.org/wiki/Null_Object_pattern > > > 2009/6/4 Hernan Wilkinson <[email protected]> > > I was going to suggest exactly that. > As a rule, I never use nil because if you do it you will have to > check for it somewhere... nil is the root of most of the problems! > if not, look at all the errors I fixed in the other mail, most of > them are because nil is being used. > So, instead of nil, another object has to be use, and like you said > in this case an empty collection I think will work. I'm just > changing that... I'll send the changes today (I hope). > > Hernan. > > > On Thu, Jun 4, 2009 at 11:32 AM, Michael Rueger <[email protected]> > wrote: > Sean Allen wrote: > > > Just as a bit more info. I used squeak for several months without > ever > > seeing this error. > > I used pharo for 3 months without seeing this error. I've only > gotten > > this error in the latest images > > with the latest vm and get it constantly. Not occassionally, I can > get > > this to happen at least > > once every 120 seconds or so, sometimes more often. It would seem > to be > > as an outsider, > > that something must have changed. > > it definitely sounds like it. > Would be good to investigate what might have changed in the call path > that *sets* the variable to check why it is ending up being nil. Maybe > it shouldn't be set or initialized to nil but to an empty collection > in > those cases? > > Michael > > _______________________________________________ > Pharo-project mailing list > [email protected] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > Pharo-project mailing list > [email protected] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > Pharo-project mailing list > [email protected] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > _______________________________________________ > Pharo-project mailing list > [email protected] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project _______________________________________________ Pharo-project mailing list [email protected] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
