迷惑的typedef

#include<iostream>
using namespace std;

typedef   int   arr5[5];
typedef   arr5*   p_arr5;
typedef   p_arr5   arrp10[10];

arr5    togs;                     //togs是具有5个元素的int数组
p_arr5    p2;                    //p2是一个指针，指向具有5个元素的int数组
arrp10    ap;                    //ap是具有10个元素的指针数组，每个指针指向具有5个元素的int数组

int main(){
    for (int i = 0; i < 5; i++)
        togs[i] = i;
    p2 = &togs;
    for (int i = 0; i < 5; i++){
        cout << (*p2)[i]<< " ";
    }
    cout << endl;
    //ap = &p2; //error
    *(ap + 9) = p2;//即ap[9] = p2;
    for (int i = 0; i < 5; i++){
        //cout << (*(ap + 9))[i] << " ";//error
        cout << (**(ap + 9))[i] << " ";//(*ap[9])[i]
    }
    cout << endl;
    system("pause");
    return 0;
}

Virtual table

#include<iostream>
using namespace std;
class Base{
public:
    virtual void fun1(){ cout << "Base:fun1" << endl; }
    virtual void fun2(){ cout << "Base:fun2" << endl; }
    virtual void fun3(){ cout << "Base:fun3" << endl; }
private:
    int num1;
    int num2;
};
typedef void (*Fun)(void);//void func(void),func = *Fun;

int main(){
    Base b;
    Fun pFun;
    pFun = (Fun)*((int*)*(int*)(&b) + 0);
    pFun();
    pFun = (Fun)*((int*)*(int*)(&b) + 1);
    pFun();
    pFun = (Fun)*((int*)*(int*)(&b) + 2);
    pFun();
    system("pause");
    return 0;
}