c++ how to include (circular dependency)?

Question

I have Environment.h file:

#include 
#include \"interfaces.h\"

#ifndef ENVIRONMENT_H
#define ENVIRONMENT_H

class Environment {};
#endif
<         


        

Answer 1

For circular dependencies one can use Forward declaration(s)

In Interfaces.h just above interface definition, forward declare Environment as follows:

class Environment;

Then when you implement IMoving in a class, you will include Environment.h in its implementation file.

You can read more about Forward declaration here.