Hi guys,

I have a small C++ problem to which I don't know the best solution. I have two classes A and B as follows:

class A {
    int n;
    B* b;
public:
    A(int num): n(num) {
        b = new B[n];

        for (int i = 0; i < n; i++) {
            b[i].setRef(this);
        }
    }

    ~A() {
        delete [] b;
    }
};


class B {
    A* a;
public:
    B() { }

    B(A* aref) {
        a = aref;
    }

    void setRef(A* aref) {
        a = aref;
    }
};

I am creating an object of class A by passing to its constructor the number of objects of class B I want to be created. I want every object of class B to hold a pointer to the class A object that creates it. I think the best way to do this would be by passing the pointer to the class A object as a constructor argument to the class B object.

However, since I'm using the new operator, the no-args constructor for class B is called. As a result, the only solution I can see here is calling the setRef(A*) method for every object of class B after it has been constructed using the new operator.

Is there a better solution/design pattern that would be more applicable here? Would using placement new for class B be a better solution?

Thanks in advance for your help.