Thread: copy constructor/type converter?

Hi there,
I have two individual classes:class A, and class B
How can I convert class A to class B if necessary, vice versa?
I tried copy constructors in both classes, it won't work.
I tried overload assignment operator, but this operator accept both arguments with same type only.
Thank you!

.. Eh?

Code:

class B;

class A
{
public:
	void set_data(int a)  { data = a; }
	int get_data(void)   { return data; }
	void operator = (B t);
private:
	int data;
};

class B
{
	int data;
public:
	void set_data(int a)  { data = a; }
	int get_data(void)   { return data; }
};

void A :: operator = (B t) { data = t.get_data(); }

Or use friend