关于A中用到B， B中用到A的问题

//A.h#ifndef AH#define AHclass B;class A {public:    B* b;    void setB();    ~A();};#endif

//B.h#ifndef BH#define BH#include "A.h"class B {public:    A a;    void haha() {     }};#endif

//A.cpp#include "A.h"#include "B.h"A::~A() {    delete b;}void A::setB() {    b->haha();}