Reference to implementation of interface.

[Christian Aistleitner]

Hello,

I am in need of a way to reference the class implementing an interface  
 from within the interface's definition.
Example:

interface A
{
   static A constA;
}

Here the type "A" within "static A constA" is short for any class  
implementing the interface "A". But I'd prefer to have some way to  
reference the class, which is implementing this interface -- and not "any  
class implementing A".

The above definition of the interface "A" allows to write

class B: A
{
   static B constA;
}

which is just what I want. However, it also allows

class C: A
{
   static B constA;
}

which I would like to forbid. The "B" within the "static B constA" is the  
problem. I would like to force it to "C" (the class currently implementing  
the interface "A") within the definition of the interface "A".

Can this be modelled with D?

Kind regards,
Christian Aistleitner