Hi all, It has been some time since I have used FPC/Laz. I was looking for some information on 'observer pattern' the other day, and I found this article[1]. I notice that it is a bit old, and it makes me question whether or not I have made an error following it.
I get an invalid cast error at this code (DigitalClock1 as ISubject).Attach(fClockTimer as IObserver); which is actually flipped and should be (fClockTimer as ISubject).Attach(DigitalClock1 as IObserver); So, my questions ... Is the article out of date? Are these patterns implemented in the base code? And as an aside, what is the state of tiOPF, I could not get it to install in Lazarus 1.02. Thank you. [1] - http://blogs.teamb.com/joannacarter/2004/06/30/690 -- Regards, Brian _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
