#include <iostream>
using namespace std;

class A {
public:
    virtual void f() {
        cout << "In f\n";
    }
};

void exploit()
{
    cout << "In exploit\n";
}

void callf(A *a)
{
    a->f();
}

int
main()
{
    A a;
#if 1
    int vtable[1] = { (int) exploit };
    * (int **)&a = vtable;
#endif
    callf(&a);
}