out of class declaration virtual function disambiguation

[bonzo]

I have a code like this:

struct A1{ virtual void DOH()=0 };
struct A2{ virtual void DOH()=0 };

struct B: public A1,A2{
    void A1::DOH(){ printf("doh!"); }
    void A2::DOH(){ printf("doh!"); }
};

that of course compiles correctly. The question is : what is the proper syntax
to declare the DOH's function bodies outside B declaration?
That is if I write

...
struct B: public A1,A2{
    void A1::DOH();
    void A2::DOH();
};
void B::A1::DOH(){ printf("doh!"); }
void B::A2::DOH(){ printf("doh!"); }

the compiler rises the error "the symbol to the left of a '::' must be a type"

thanks

 

[bonzo]

:-( nobody knows ?