c++虛表 內存分配

#include <iostream>
#include <stdlib.h>#include
<windows.h>using namespace
 std;class A{  
 char a;public:  
 A(){a = 'a';cout<<"is
A construct function"<<endl;} 
  ~A(){cout<<"is A Unconstruct function"<<endl;} 
  virtual void f(){cout<<"im A v_table"<<endl;}};class A1{ 
  char b;public:    A1(){b = 'b';cout<<"is A1
 construct function"<<endl;}  
 ~A1(){cout<<"is A1 Unconstruct function"<<endl;} 
  virtual void f(){cout<<"im A1 v_table"<<endl;}};class
 B:public A,public A1{ 
  char c;public:  
 B(){c = 'c';cout<<"is B construct function"<<endl;} 
  ~B(){cout<<"is B Unconstruct function"<<endl;}
   virtual void f1(){cout<<"im
B v_table"<<endl;}};typedef
void (*Fun)(void);int main(){ 
  B b;    char *p = (char *)(&b); 
  cout<<sizeof(b)<<endl;  
 Fun pFun = NULL;  
 pFun = (Fun)*((int*)*(int*)(&b));  
 pFun();    pFun = (Fun)*((int*)*(int*)(&b)+1); 
  pFun();    pFun = (Fun)*((int*)*(int*)(p+8)); 
  pFun();    for(int i = 0;i<16;i++)  
     cout<<"i:"<<i<<" "<<(*(p+i))<<endl;  
 system("pause");
   return 1;}