Has any thought been given by the standards bodies to allow forward
declarations of derived types?  In light of covariant returns for
virtual methods, this would seem to be a very useful feature.

-Barry

-------------------- snip snip --------------------
class B; // forward decl

class X {
public:
    virtual B* figureItOut();
};

class D : public B; // derived forward decl, would be nice if legal

class Y : public X {
public:
    virtual D* figureItOut();
};