#include <QCoreApplication>
#include <iostream>
template <class T>
class Stack {
    struct Link {
       Link(T *d, Link *nxt) : dat(d), next(nxt) {}
       T *dat;
       Link *next;
    } *head;
public:
    void push(T* el) {
       Link* l = new Link(el, head);
       head = l;
    }
    T* peek() {
        return head->dat;
    }
    T* pop() {
        Link* oldDat = head;
        T* data = head->dat;
        head = next->head;
        delete oldDat;
        return head->dat;
    }
    friend class Iterator;
};
class Iterator {
   Stack::Link *sp;
   public:
   Iterator(const Stack<T> &s) : p(s.head) {}
   Iterator() : p(0) {}
 };
class Foo {
    int z;
    public:
        Foo(int zz) : z(zz) {
            std::cout<<"Foo ctor! "<<z<<std::endl;
        }
     friend std::ostream& operator<< (std::ostream &s, const Foo & f) {
        return s<<f.z;
    }
};
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    Foo *f1 = new Foo(228);
    Stack<Foo> fooStack;
    fooStack.push(f1);
    Foo *z = fooStack.peek();
    std::cout<<*z;
    return a.exec();
}