виртуальность

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#include <iostream>
using namespace std;
class Foo {
public:
virtual void f() {
cout << "Foo::f()" << endl;
}
};
class Bar : public Foo {
public:
void f() {
cout << "Bar::f()" << endl;
}
};
class Tar : public Bar {
public:
void f() {
cout << "Tar::f()" << endl;
}
};
int main() {
Tar t;
Foo *f = &t;
t.f();
f->f();
return 0;
}