How to make a derived class access the private member data?

Question

I\'m stuck with a c++ problem. I have a base class that has a self referential object pointer inside the private visibility region of the class. I have a constructor in the base

Answer 1

Well I think, you were trying to achieve a result like this!! This does not report any compiler error or such. Good luck!!!

class base{
private:
     base *ptr1;
     int data;
public:
     base(){}
     base(int d) { data=d; }
     base* getPtr();   //getter to get access to base pointer
     void setPtr(base* val); // setter to set value of the pointer variable
};

base* base::getPtr()
{
    return ptr1;
}

void base::setPtr(base* val)
{
    ptr1 = val;
}

class derived:private base{
private:
    base* getPtr();
    void setPtr(base* val);
public:
     void member();

};

base* derived::getPtr()
{
    return base::getPtr(); //derived version just invokes the base class version

}

void derived::setPtr(base* val)
{
    base::setPtr(val);     //derived version just invokes the base class version

}
void derived::member()
{
    base *temp=new base(5); //put in a random number here instead of val
    temp -> setPtr(nullptr);
}