friend class with limited access

Question

I want to make a class A friend class of class B. I want to do this as these interact very much and A needs to change internals of class B (which I dont want to expose using

Answer 1

You can do following thing..

class A{
};

class B{
private: 
    void setFlags();
protected:
    void setState();

}; 

class RestrictedB :public B{  
    friend class A;
};