C++ interface vs D and com

[Adam D. Ruppe via Digitalmars-d-learn]

On Tuesday, 12 July 2016 at 15:09:26 UTC, Adam Sansier wrote:
> I marked the interface extern(C++) so it's a C++ style 
> interface.
>  The first field of a COM object is a pointer to its vtable.

If it is a COM interface, you should make it a COM interface by 
inheriting from IUnknown.

http://dlang.org/spec/interface.html#com-interfaces