It is kind of curious why interface typed identifiers don't implicitly cast to Object, and you must explicitly cast.

But regardless of the reason, adopting a convention (and a bad one at that) such as prefixing interfaces with "I" probably shouldn't be done at the language level. And even more, D already has avoided creating any kind of special types (you can throw Object, for instance, and it's not a derivative of Exception) so far as I can tell...why start now?

Cheers,
Scott S. McCoy

On Sun, 2008-03-30 at 23:25 +0200, Frank Benoit wrote:

COM is the only reason I am aware of, why interfaces are not implicit 
compatible to to object.Object. But COM is a very special case which 
probably can get a special solution?

How about making /IUnknown/ a special interface without this 
compatibility and have all interfaces, not derived from IUnknown be 
compatible to Object?