Question

Say I have these two classes:

// a.h

#include "b.h"

and:

// b.h

include "a.h"

I understand there is a problem over here, but how can I fix it and use a objects and their methods in b class and vice versa?

Answer 1

You can use forward declarations, like this:

class B;

class A
{
    B* ThisIsValid;
}

class B
{
    A SoIsThis;
}

For more information, see this SO question.

As for the preprocessor #includes, there’s likely a better way to organize your code. Without the full story, though, it’s hard to say.