Re: design problem with inheritance

ok thanks for correction, I put a incomplete code but my problem is
another, how with this design I can access to private data of class
Duck
when implements the Fly method?

class NoFly: public FlyBehav{
public:
        void Fly(){std::cout<<"Cannot Fly\n";}
};

class CanFly: public FlyBehav{
public:
        void Fly()
        {
            // how get Duck private data???
            std::cout<<"Flying across the sky\n";
        }

};

if the Fly() method of CanFly or NoFly needs to privata data of the
class Duck how can do it with this design?

Maybe I could pass a pointer to base class Duck but so I can access
only to public member of Duck. I would like access to Duck private
data.

class FlyBehav{
public:
        FlyBehav(Duck * _ownClass)
        {
            ownClass=_ownClass;
        }
        virtual void Fly()=0;
};

class CanFly: public FlyBehav{
public:
        CanFly(Duck * ownClass)
        {

        }
        void Fly()
        {
             std::cout<<"Flying across the sky\n";}
             ownClass->DuckPublicMethod();
             // no ways to acess to Duck private data or private
method!!!
        }
};