问正确地包括基类和子类(派生类)的头文件吗？

EN

// Base1.h
#ifndef BASE1_H
#define BASE1_H
#include "Base2.h"

class Base2;

class Base1 {
    ...
    void func(Base2* b);
    virtual void subfunc(Base2* b) = 0;
    ...
};
#endif



// Base2.h
#ifndef BASE2_H
#define BASE2_H
#include "Base1.h"

class Base1;

class Base2 {
    ...
    void func(Base1 *b);
    virtual void subfunc(Base1* b) = 0;
    ...
};
#endif

// Base2_Sub1.h
#ifndef BASE2_SUB1_H
#define BASE2_SUB1_H
#include "Base2.h"
// What else to include!?

class Base2_Sub1 : public Base2 {
    ...
    void subfunc(Base1_Sub1 *b);
    void subfunc(Base1_Sub2 *b);
    void subfunc(Base1_Sub3 *b);
    void subfunc(Base1_Sub4 *b);
    void subfunc(Base1_Sub5 *b);
    ...
};
#endif