Question

Is it possible to access base class public member from instance of derived class in some other locations in the program.

class base {
public:
    int x;

    base(int xx){
    x = xx;
    }
};

class derived : base {
public:
    derived(int xx) : base(xx){
    }
};

class main {
public:
    derived * myDerived;      

    void m1(){
        myDerived = new derived(5);
        m2(myDerived);  
    }

    void m2(derived * myDerived){
        printf("%i", myDerived->x);
    }    
};

After above code, I got following error.

`error: 'int base::x' is inaccessible`

Answer 1

You inherit privately from the base class. What you typically need is public inheritance:

class derived : public base

Here is the FAQ on private inheritance.