類繼承和引用

#include <iostream>using std::cout;using std::endl;class BASE{public:    BASE(int n):m_b(n){}    ~BASE(){}    void print(){cout<<"BASE : m_b = "<<m_b<<endl;}private:    int m_b;};class DERIVED : public BASE{public:    DERIVED(int n):m_d(n),BASE(2*n){}    ~DERIVED(){}    void print(){cout<<"DERIVED : m_d= "<<m_d<<endl;}private:    int m_d;};int main(){    DERIVED derived(4);    BASE &base=derived;    base.print();    return 0;}

執行的語句：void print(){cout<<"BASE : m_b = "<<m_b<<endl;}