クラス内の虚関数アドレスの取得

// 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();


　　//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
　　// n ， n 

    int    ** pVtab = (int**)&d;            // ， ： ， ： 

    Pfunc dd = (Pfunc)pVtab[0][0];

    dd();

    return 0;

}