// project100.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include "pch.h"
#include <iostream>
#include <time.h >
#include <stdio.h>
#include <vector>
using namespace std;
class Grand //爷爷类
{
public:
int m_grand;
};
class A1 : virtual public Grand
{
public:
int m_a1;
};
class A2 : virtual public Grand
{
public:
int m_a2;
};
class C1 :public A1, public A2
{
public:
int m_c1;
};
int main()
{
//一:三层结构时虚基类表内容分析
cout << sizeof(Grand) << endl;
cout << sizeof(A1) << endl;
cout << sizeof(A2) << endl;
cout << sizeof(C1) << endl;
//A1 a1obj;
//a1obj.m_grand = 2;
//a1obj.m_grand2 = 6;
a1obj.m_grand2_1 = 7;
//a1obj.m_a1 = 5;
C1 c1obj;
c1obj.m_grand = 2;
c1obj.m_a1 = 5;
c1obj.m_a2 = 6;
c1obj.m_c1 = 8;
//C1 c2obj;
//没有用到vbptr2,只用到了vbptr1
//二:虚基类为什么这么设计
//为什么这么设计,是个很难回答的问题;
//A2 *pobja2 = new C1();
A2 *pa2 = &c1obj;
pa2->m_grand = 8;
pa2->m_a2 = 9;
return 1;
}