The most annoying problem I have with Pascal currently is with circular unit
dependanices and “global” classes that need to be referenced from many units.
In other languages I would make a forward declaration of the class in one file
then implement it in another file so that all files could reference the class.
It’s maybe a symptom of a “bad" design but sometimes it’s just faster and
easier so it’s a problem I have to fight Pascal to make it work.
When I moved to FPC the solution I started using was this pattern below where I
make an abstract class then override the methods I need in the global namespace
within in the “main unit”. This is a bad hack to workaround a feature of the
language but I wonder if there’s a better way. Does anyone have any ideas I
could try?
========
"global” unit shared by many other units:
type
TSomeClassAbstract = class (TObject)
procedure DoSomething; virtual; abstract;
end;
“main” unit which implements the class:
type
TSomeClass = class (TSomeClassAbstract)
procedure DoSomething; override;
end;
Regards,
Ryan Joseph
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