method returning child, doesn't overrides declared method returning parent

[Steven Schveighoffer]

On Tue, 30 Aug 2011 11:58:43 -0400, Timon Gehr <timon.gehr at gmx.ch> wrote:

> On 08/30/2011 05:49 PM, Christophe wrote:
>> The fact that the code compile only if all interface methods are
>> implemented does not imply that the programmer knows which method he
>> implemented hooks and which does not.
>
> interface I{
>      void method();
> }
>
> class C: I{
>      void method() {} // not a hook.
> }

Why not?  All a "hook" is is adding an entry into a base class' vtable.   
This is no different, it's just the base "class" is an interface.

-Steve