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Copy pathVirtualTest.cpp
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115 lines (105 loc) · 3.44 KB
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#include <iostream>
using namespace std;
class Base1 {
public:
virtual void f() { cout << "Base1::f" << endl; }
virtual void g() { cout << "Base1::g" << endl; }
virtual void h() { cout << "Base1::h" << endl; }
~Base1(){cout << "Base1::~Base1()\n";}
};
class Base2 {
public:
virtual void f() { cout << "Base2::f" << endl; }
virtual void g() { cout << "Base2::g" << endl; }
virtual void h() { cout << "Base2::h" << endl; }
~Base2(){cout << "Base2::~Base2()\n";}
};
class Base3 {
public:
virtual void f() { cout << "Base3::f" << endl; }
virtual void g() { cout << "Base3::g" << endl; }
virtual void h() { cout << "Base3::h" << endl; }
virtual void i() { cout << "Base3::i" << endl; }
~Base3(){cout << "Base3::~Base3()\n";}
};
class Derive : public Base1, public Base2, public Base3 {
public:
virtual void f() { cout << "Derive::f" << endl; }
virtual void g1() { cout << "Derive::g1" << endl; }
~Derive(){cout << "Base1::~Base1()\n";}
};
typedef void(*Fun)(void);
void Base_vTable()
{
Fun pFun = NULL;
Base1 d;
int** pVtab = (int**)&d;
//Base1's vtable
//pFun = (Fun)*((int*)*((int*)((int*)&d+0))+0);
pFun = (Fun)pVtab[0][0];
pFun();
//pFun = (Fun)*((int*)*((int*)((int*)&d+0))+1);
pFun = (Fun)pVtab[0][1];
pFun();
//pFun = (Fun)*((int*)*(int*)((int*)&d+0)+2);
pFun = (Fun)pVtab[0][2];
pFun();
//Derive's vtable
std::cout << pFun << std::endl;
}
void Derive_vTable()
{
Fun pFun = NULL;
Derive d;
int** pVtab = (int**)&d;
//Base1's vtable
//pFun = (Fun)*((int*)*((int*)((int*)&d+0))+0);
pFun = (Fun)pVtab[0][0];
pFun();
//pFun = (Fun)*((int*)*((int*)((int*)&d+0))+1);
pFun = (Fun)pVtab[0][1];
pFun();
//pFun = (Fun)*((int*)*(int*)((int*)&d+0)+2);
pFun = (Fun)pVtab[0][2];
pFun();
//Derive's vtable
//pFun = (Fun)*((int*)*(int*)((int*)&d+0)+3);
pFun = (Fun)pVtab[0][3];
pFun();
//The tail of the vtable
pFun = (Fun)pVtab[0][4];
cout<<pFun << "-----------" <<&pFun<<endl;
//Base2's vtable
//pFun = (Fun)*((int*)*(int*)((int*)&d+1)+0);
pFun = (Fun)pVtab[1][0];
pFun();
//pFun = (Fun)*((int*)*(int*)((int*)&d+1)+1);
pFun = (Fun)pVtab[1][1];
pFun();
pFun = (Fun)pVtab[1][2];
pFun();
//The tail of the vtable
pFun = (Fun)pVtab[1][3];
cout<<pFun<<endl;
//Base3's vtable
//pFun = (Fun)*((int*)*(int*)((int*)&d+1)+0);
pFun = (Fun)pVtab[2][0];
pFun();
//pFun = (Fun)*((int*)*(int*)((int*)&d+1)+1);
pFun = (Fun)pVtab[2][1];
pFun();
pFun = (Fun)pVtab[2][2];
pFun();
pFun = (Fun)pVtab[2][3];
pFun();
//The tail of the vtable
pFun = (Fun)pVtab[2][4];
//pFun();
cout<<pFun<<endl;
}
int main(int argc, char const *argv[])
{
// Derive_vTable();
Base_vTable();
return 0;
}