How to declare objects in Delphi

[apostolchopov]

Hi, guys!
Can you, please, tell me how to declare objects in Delphi without having the compiler error message '... is not yet completely defined'?
I tried to declare a class A, then to use it the declaration of another class B and, actually, after this put down the actual declaration of class B. In some cases it worked perfectly well, in other cases it does not work.
For instance:

type A = class;

B = class(TObject)
constructor Create;
function GetAnA : A;
...
end;

A = class(TObject)
constructor Create;
...
end;

 

[Stretchwickster]

You need to rearrange your declarations. I expect that class B needs the full declaration of class A before it can parse your function GetAnA. Try this instead:

A = class(TObject)  
  constructor Create;
  ...
end;

B = class(TObject)
  constructor Create;
  function GetAnA : A;
  ...
end;

Clive
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"To err is human, but to really foul things up you need a computer."
Paul Ehrlich
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