I'd suggest to add two new keywords you can use like this:
Strict
Print New T1.GetName ( ) 'prints "T1"
Print New T2.GetName ( ) 'prints "T1 extended by T2"
Type T1
Method GetName$ ( ) Extendable
Return "T1" + CallExtension ( )
EndMethod
EndType
Type T2
Method GetName$ ( )
Return " extended by T2"
EndMethod
EndType
Sometimes I want to have a method which can't be overwritten, but be extended like Method New() or Method Delete().
So I'd suggest to add a keyword "Extendable" which can be used like "Abstract" or "Final" with the limit only to use it with methods.
This keyword says you can 'overwrite' this method, but your method will not be called instead of the super method, it'll be call when super method calls "CallExtension".
CallExtension has same params and return value like the method calling it and CallExtension can only be called from an extendable method.
This could also be used for event handlers like this:
...
Type TApplication
...
Method OnEvent ( Event:TEvent ) Extendable
Select Event.id
Case EVENT_APPTERMINATE
End
Case ...
...
Default
Return CallExtension ( Event ) 'All methods overwriting this one cannot receive an appterminate event.
EndMethod
EndMethod
EndType
How do think about it?
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