abstract base classes & MI

[Charles Kerr <ckerr at enterprise dot nssl dot noaa dot gov>]

Using egcs-2.93.06 (the 1999/02/08 snapshot), the code:

     struct A_interface {
        virtual void foo ( ) = 0;
     };
     struct A_impl {
        virtual void foo ( );
     };
     struct B_interface: public A_interface {
        virtual void bar ( ) = 0;
     };
     struct B_impl : public A_impl, public B_interface {
        virtual void bar ( );
     };
     struct C: public B_impl {
        void asdf ( ) {
           foo ( );
        }
     };

yields the error:

     Foo.C: In method `void C::asdf()':
     Foo.C:15: request for member `foo' is ambiguous in multiple inheritance lattice

I don't see the ambiguity.  Does egcs really think I want to invoke the pure method? :)