Proper way to #include when there is a circular dependency?

Question

I\'m using #pragma once, not #include guards on all my h files. What do I do if a.h needs to #include b.h and b.h needs to #include a.h?

I\'m getting all sorts if e

Answer 1

You need to forward declare the definitions you need. So if A uses B as a parameter value, you need to forward declare B, and vice versa.

It could be that just forward declaring the class names:

 class A;
 class B;

solves your problems.

The accepted answer to this question provides some additional guidance.