I understand Assigned as being the same as <> nil, so Assigned(Object) = Object <> nil
I vaguely remember that it could be safer in some corner case, but I don't remember ever meting that. Free is how you release the memory allocated for a object. Free calls Destroy. Never call Destroy manually. When you implement the destructor you always implement Destroy, never change Free. Nil is not a routine, it is a value, it means that the object is empty, it does not exist / is not allocated. Nil in existing implementations that I know is represented by the value zero. The typical life-cycle of a object is: MyObject := TMyObject.Create; try MyObject.DoSomething(); finally MyObject.Free; end; To implement this object you should implement Create, DoSomething and Destroy. -- Felipe Monteiro de Carvalho _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
