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#ifndef CLASSA_H
#define CLASSA_H

#include "classB.h"

class ClassA
{
public:
  // constructor, other public members
private:
      ClassB *child;
      // other private members
};
#endif

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#ifndef CLASSB_H
#define CLASSB

#include "classA.h"

class ClassB
{
public:
  // constructor, other public members
private:
      ClassA *parent;
      // other private members
};
#endif

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error C2061: syntax error : identifier 'ClassB'

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class ClassA;

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class ClassB;