Question

I have 2 files that are both including the other file and I am getting strange errors.

#ifndef NODE_H
#define NODE_H

#include "model.h"
etc....
#endif

#ifndef MODEL_H
#define MODEL_H

#include "Node.h"
etc....
#endif

Here is my example code of what I am doing. Can somebody explain to me why this is not possible or allowed? And what I should do to get passed this problem.

Answer 1

You have a circular dependency between Node and model.

To deal with this, instead of…

#include "Node.h"

…in model.h , forward declare…

class Node;

…and this will allow you to have Node& node; in your Model class.

Or vice-versa.

Better still… see if you can revisit your design and eliminate this circular dependency.