How do I get a member function in one class to know about another class

This is not my application, but it will illustrate my question. Suppose I have one class called TelephoneCall and another class called PBX. Both are defined as handle classes. Suppose I define a method (member function) in class PBX and want to pass an object of type TelephoneCall to it. For example, the method in class PBX could be called DialCall. I would want to pass a TelephoneCall object as an argument to the DialCall method of class PBX.

Is inheritance the only way I can have the PBX utilize data from the TelephoneCall object? Or is there another way by which a method of one object can "know" about another class?

Answer 1

[Sean de Wolski]

If you do not want the TelephoneCall object to inherit from PBX why not just give it its own DialCall method?

[Linda]

Thank you for replying. More detailed explanantion sought concerning how to get one object to know about the other.