Does interface delegation of an inherited interface require a wrapper class?

Question

Delphi allows for interface delegation using the implements keyword.

For example

IIndep1 = interface
  function foo2: integer;
end;

IIn         


        

Answer 1

Is there a way to avoid the wrapper class ancestor?

No, the inherited interface has to be bound to a an ancestor class. Delphi does not implicitly bind inherited interfaces, because of reasons explained here. Also, it cannot bind to the current class, unless it manually delegates all calls to the composed item.

We are left with only one option. An ancestor wrapper class, to which we can bind ILev1