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873天前#include <iostream> |
#include <stdio.h> |
typedef void (*fun_pointer)(void); |
using namespace std; |
class Test |
{ |
public: |
Test() |
{ |
cout<<"Test()."<<endl; |
} |
virtual void print() |
{ |
cout<<"Test::Virtual void print1()."<<endl; |
} |
virtual void print2() |
{ |
cout<<"Test::virtual void print2()."<<endl; |
} |
}; |
class TestDrived:public Test |
{ |
public: |
static int var; |
TestDrived() |
{ |
cout<<"TestDrived()."<<endl; |
} |
virtual void print() |
{ |
cout<<"TestDrived::virtual void print1()."<<endl; |
} |
virtual void print2() |
{ |
cout<<"TestDrived::virtual void print2()."<<endl; |
} |
void GetVtblAddress() |
{ |
cout<<"vtbl address:"<<(int*)this<<endl; |
} |
void GetFirstVtblFunctionAddress() |
{ |
cout<<"First vbtl funtion address:"<<(int*)*(int*)this+0 << endl; |
} |
void GetSecondVtblFunctionAddress() |
{ |
cout<<"Second vbtl funtion address:"<<(int*)*(int*)this+1 << endl; |
} |
void CallFirstVtblFunction() |
{ |
fun = (fun_pointer)* ( (int*) *(int*)this+0 ); |
cout<<"CallFirstVbtlFunction:"<<endl; |
fun(); |
} |
void CallSecondVtblFunction() |
{ |
fun = (fun_pointer)* ( (int*) *(int*)this+1 ); |
cout<<"CallSecondVbtlFunction:"<<endl; |
fun(); |
} |
private: |
fun_pointer fun; |
}; |
int TestDrived::var = 3; |
int main() |
{ |
cout<<"sizeof(int):"<<sizeof(int)<<"sizeof(int*)"<<sizeof(int*)<<endl; |
fun_pointer fun = NULL; |
TestDrived a; |
a.GetVtblAddress(); |
cout<<"The var's address is:"<<&TestDrived::var<<endl; |
a.GetFirstVtblFunctionAddress(); |
a.GetSecondVtblFunctionAddress(); |
a.CallFirstVtblFunction(); |
a.CallSecondVtblFunction(); |
return 0; |
} |
