33 继承（五）

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类/对象大小计算

这里写图片描述

#include <iostream>using namespace std;class BB{public:    int bb_;};class B1 :virtual public BB{public:    int b1_;};class B2 :virtual public BB{public:    int b2_;};class DD :public B1,public B2{public:    int dd_;};int main(){    cout << sizeof(BB) << endl;    cout << sizeof(B1) << endl;    cout << sizeof(DD) << endl;    B1 b1;    long** p;    cout << &b1 << endl;    cout << &b1.bb_ << endl;    cout << &b1.b1_<< endl;    p = (long**)&b1;    cout << p[0][0] << endl;    cout << p[0][1] << endl;    DD dd;    cout << &dd << endl;    cout << &dd.bb_ << endl;    cout << &dd.b1_ << endl;    cout << &dd.b2_ << endl;    cout << &dd.dd_ << endl;    p = (long**)&dd;    cout << p[0][0] << endl;    cout << p[0][1] << endl;    cout << endl;    cout << p[2][0] << endl;    cout << p[2][1] << endl;    return 0;}//深入C++对象模型

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