Question

If i want a circular reference but in two different files in C++, how would I implement that?

For example

AUnit.h

#inclue <BUnit.h>
class AClass : public TObject
{

   __published
        BClass * B;
};

BUnit.h

#include <AUnit.h>
class BClass : public TObject
{
    __published
        AClass *A;     
};

I can’t make it in only one file with forward declarations.

Answer 1

I assume you’re talking about circular dependencies.

The answer is indeed to use a forward declaration, such as:

AUnit.h

#include <BUnit.h>
class AClass : public TObject
{
   BClass *B;
};

BUnit.h

class AClass;  // Forward declaration

class BClass : public TObject
{
   AClass *A;
};

You could even have a forward declaration in both header files, if you wanted.