C++ 虛函數表解析——轉自陳皓

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C++ 虛函數表解析 - 陳皓專欄　【空穀幽蘭，心如皓月】 - 部落格頻道 - CSDN.NET
http://blog.csdn.net/haoel/article/details/1948051/

 

#include<iostream>using namespace std;//基類class Base {public:virtual void f() { cout << "Base::f" << endl; }virtual void g() { cout << "Base::g" << endl; }virtual void h() { cout << "Base::h" << endl; }};//無虛函數覆蓋的子類class derive:public Base{virtual void f1() { cout << "derive::f1" << endl; }virtual void g1() { cout << "derive::g1" << endl; }virtual void h1() { cout << "derive::h1" << endl; }};//有虛函數覆蓋class derive2:public Base{virtual void f() { cout << "derive2::f" << endl; }virtual void g() { cout << "derive2::g" << endl; }virtual void h() { cout << "derive2::h" << endl; }};int main(){//基類裡虛函數/*typedef void(*Fun)(void);//表示定義一個函數指標類型Base b;Fun pFun = NULL;cout << "虛函數表地址：" << (int*)(&b) << endl;cout << "虛函數表 — 第一個函數地址：" << (int*)*(int*)(&b) << endl;// Invoke the first virtual function pFun = (Fun)*((int*)*(int*)(&b));//加上後面的（Fun）*是將int*強制轉換為函數指標pFun();*///無虛函數覆蓋/*typedef void(*Fun)(void);derive c;Fun pFun=NULL;cout<<(int*)*(int*)(&c)+0<<endl;pFun=(Fun)*((int*)*(int*)(&c)+0);pFun();cout<<(int*)*(int*)(&c)+1<<endl;pFun=(Fun)*((int*)*(int*)(&c)+1);pFun();cout<<(int*)*(int*)(&c)+2<<endl;pFun=(Fun)*((int*)*(int*)(&c)+2);pFun();cout<<(int*)*(int*)(&c)+3<<endl;pFun=(Fun)*((int*)*(int*)(&c)+3);pFun();*///system("pause");return 1;}

　　

 

C++ 虛函數表解析（轉）——轉自陳皓