On 10/28/2012 09:34 AM, Michael Van Canneyt wrote: > > > On Sun, 28 Oct 2012, bsquared wrote: > >> 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 Is the article out of date?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? > > The observer pattern is implemented in tiOPF. > >> And as an aside, what is the state of tiOPF, I could not get it to >> install in Lazarus 1.02. > > Version 3 is designed to work with Delphi 2009 and higher. > Graeme Geldenhuys actively maintains tiOPF version 2. It works > definitely with Lazars 1.0.2, I use it myself. > > Michael. > _______________________________________________ > fpc-pascal maillist - > fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > Thank you for responding. I thought I recalled a stipulation for version 3. I noticed it had an Compilers/FPC folder, so I hoped it was compatible.
Having trouble getting V2 demos to work. Have to keep at it. -- Regards, Brian _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
