Шаблоны в С++

#include <iostream>
#include <vector>

int main();

struct AbstractFunctor
{
    virtual void operator()(int) const = 0;
};
template<class E> void for_each(std::vector<E>& v, const AbstractFunctor& functor)
{
    for(unsigned int i=0; i<v.size(); i++) functor(v[i]);
}

int main()
{
    struct Functor: public AbstractFunctor
    {
        void operator()(int i) const {std::cout << i << std::endl;}
    };

    const AbstractFunctor& functor = *(new Functor());
    std::vector<int> vec(10);
    for_each(vec, functor);
    return 0;
}

const AbstractFunctor& functor = *(new Functor()); 

const AbstractFunctor& functor = Functor();

#include <iostream>

struct Printer
{
    Printer() { std::cout << "ctr at " << int(this) << std::endl; }
    ~Printer() { std::cout << "dtr at " << int(this) << std::endl; }
};

Printer p() { return Printer(); }

void f()
{
    const Printer& r1 = *(new Printer());
    const Printer& r2 = p();
    const Printer& r3 = Printer();
    std::cout << "r1  at " << int(&r1) << std::endl;
    std::cout << "r2  at " << int(&r2) << std::endl;
    std::cout << "r3  at " << int(&r3) << std::endl;
}

int main()
{
    std::cout << "start" << std::endl;
    f();
    std::cout << "end" << std::endl;
    return 0;
}

start
ctr at 134520840
ctr at -1073744318
ctr at -1073744317
r1  at 134520840
r2  at -1073744318
r3  at -1073744317
dtr at -1073744317
dtr at -1073744318
end