[Mingw-users] MS COM ABI - Multiple Inheritence?

[Chris T. <tel...@mi...>]

Does anyone know which I can fine a description of the
COM ABI that describes what happens for multiple
inheartence?

Is it this?

struct A
   {
   PVOID vtable_A ;
   int dataA ;
   } ;

struct B
   {
   PVOID vtable_B ;
   int dataB ;
   } ;

struct C // : public A,B
   {
   PVOID vtable_A ;
   int dataA ;
   PVOID vtable_B ;
   int dataB ;
   } ;

And when you cast to B* it adjusts the offset to the B vtable.

What I'm not sure about is if this is the senerio where the
vtable for C goes.  Does it get it's own vtable or do the
virtual functions for C get appended to the A or B vtable?

Anyone know if this is documented somewhere?