Question

Been using the solutions for a while… first question asked. (Not sure if this is the proper venue). I am stuck with a design problem.

I have 3 classes, User, Strategy, & Communicator.

I would like User to have a pointer to Communicator, and call functions when necessary.

I would like User to have a list of class Strategy, and call functions of Strategy when necessary.

I would like Communicator to have a list of class Strategy, and a pointer to User, and call functions on those when necessary.

If it helps, Communicator is merely a wrapper around a socket connection which listens to messages from the client and sends them to User or Strategy, whichever is appropriate. It also contains a function Send(string message) which sends messages from User & Strategy to the client.

The problem is that I cannot compile, since the header files end up including each other.
Any ideas would be greatly appreciated!

Answer 1

Forward declarations are your friends.

Strategy.h:

class User;
class Communicator;

class Strategy {
    /* Definition of Strategy, restricted use of User and Communicator */
};

Strategy.cpp:

#include "Strategy.h"
#include "User.h"
#include "Communicator.h"

/* Full use of all three classes */