Mine

#ifndef A_H_#define A_H_class A{public:	A();	virtual ~A();};#endif /*A_H_*/#ifndef B_H_#define B_H_#include "A.h"#include "C.h"class B : public A{public:	B();	virtual ~B();		void foo();	private:		C* c;};#endif /*B_H_*/#ifndef C_H_#define C_H_#include "A.h"class B;class C{public:	C(A *a);	virtual ~C();	private:		B *b;};#endif /*C_H_*/************** SOURCE FILES *******************#include "A.h"A::A(){}A::~A(){}#include "B.h"B::B(){}B::~B(){}void B::foo() {		}#include "C.h"C::C(A *a){		this->b = reinterpret_cast<B*>(a);}C::~C(){		b->foo();}