C++ How to avoid from cyclic inclusion?

Question

I have two classes.

First A.h

#ifndef A_H
#define A_H

#include "B.h"

class A
{
public:
    A(B* pair) :myPair(pair){};
    void checkPair();
private:
    B* myPair;
};

void A::checkPair()
{
    myPair->checkPair();
}

#endif

Second B.h

#ifndef B_H
#define B_H

#include "A.h"

class B
{
public:
    B(A* pair) :myPair(pair){};
    void checkPair();
private:
    A* myPair;
};

void B::checkPair()
{
    myPair->checkPair();
}

#endif

The Compiler tells me that he can't identify class A in B.h file. Is there any solutions for cyclic inclusion problems like this?

Yes, forward declare instead of including. And move implementations out of the header. — Luchian Grigore, Apr 20 '15 at 15:47
Probably is a duplicate of something, but that question already knew about forward declaration. — Useless, Apr 20 '15 at 15:50
Thank you, I'm sorry about this question. I understood that this question is already asked. — haksist, Apr 20 '15 at 16:07

score 1 · Answer 1 · answered Apr 20 '15 at 15:47

1

In A.h file instead of including B.h use forward declaration:

class B;

answered Apr 20 '15 at 15:47

Andrey Derevyanko

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C++ How to avoid from cyclic inclusion?

1 Answers1