2010/5/19 Graeme Geldenhuys <graemeg.li...@gmail.com>: > On 19/05/2010, Inoussa OUEDRAOGO wrote: >> >> Agreed. This mechanism exists in Delphi and is called "class helper", >> see http://docwiki.embarcadero.com/RADStudio/en/Class_and_Record_Helpers > > Ah yes, the famous "class helper" which makes designing a class > structure way more complex because their is no real structure|design - > lets just slap something on the side with a big band-aid. > > Oh and did you know about this neat little gem of "class helper" - > probably the single biggest reason I can't see a use for class helpers > at all. > > ----------------------------- > "The biggest problem with class helpers, from the p.o.v of using them > in your own applications, is the fact that only ONE class helper for a > given class may be in scope at any time." ... "That is, if you have > two helpers in scope, only ONE will be recognized by the compiler. > -----------------------------
This is the Delphi implementation limitation : _why_ should FPC implement such limitation ? Even in the case of (questionable)Delphi compatibility this limitation may be activated in Delphi mode. > So how does this help use solve the Observer problem? It doesn't. > Maybe the code we used already bolted on some class helper which now > makes all other extensibility impossible. Yeah what a wonderful way to > extend classes - NOT! Interface delegation is a better design than > class helpers. At least interface delegation doesn't limit you to a > single feature. Again, _why_ should FPC implement such limitation ? > Sorry but class helpers are probably the worst "feature" [if you can > call it that] for the Object Pascal language that Borland could come > up with. That is your opinion. Mine is that properly implemented, Class Helper as a _class extension mechanism_ is a very powerfull tool; Change the name if you want, consider the concept, not the name please. -- Inoussa O. _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
