获取类中虚函数地址

// CMemory.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <IOSTREAM>
using namespace std;

class Base {
public:
    virtual void f() { cout << "Base::f" << endl; }
    virtual void g() { cout << "Base::g" << endl; }
    virtual void h() { cout << "Base::h" << endl; }
};

class Derive:public Base{
public:
    virtual void f() { cout << "Derive::f" << endl; }
//    virtual void g() { cout << "Derive::g" << endl; }
    virtual void h() { cout << "Derive::h" << endl; }
};

int main(int argc, char* argv[])
{
    typedef void (*Pfunc)(void);
    Base b;
    cout<<"vptr addr: "<<(int *)&b<<endl;
    cout<<"first func addr: "<<(int *)(*(int *)&b+0)<<endl;
    cout<<"second func addr: "<<(int *)(*(int *)&b)+1<<endl;
    cout<<"third func addr: "<<(int *)(*(int *)&b)+2<<endl;
    
    Pfunc funcf = (Pfunc)*((int *)(*(int *)&b)+0);
    Pfunc funcg = (Pfunc)*((int *)(*(int *)&b)+1);
    Pfunc funch = (Pfunc)*((int *)(*(int *)&b)+2);
    funcf();
    funcg();
    funch();

    Derive d ;
    cout<<"vptr addr: "<<(int *)&d<<endl;
    cout<<"first func addr: "<<(int *)(*(int *)&d+0)<<endl;
    cout<<"second func addr: "<<(int *)(*(int *)&d)+1<<endl;
    cout<<"third func addr: "<<(int *)(*(int *)&d)+2<<endl;
    
    Pfunc dfuncf = (Pfunc)*((int *)(*(int *)&d)+0);
    Pfunc dfuncg = (Pfunc)*((int *)(*(int *)&d)+1);
    Pfunc dfunch = (Pfunc)*((int *)(*(int *)&d)+2);
    dfuncf();
    dfuncg();
    dfunch();

　　//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
　　//多继承时继承类拥有n个虚函数表，继承了n各类
    int    ** pVtab = (int**)&d;            //二维数组，第一维：第几个虚函数表，第二维：虚函数表中第几个虚函数
    Pfunc dd = (Pfunc)pVtab[0][0];
    dd();
    return 0;
}