#pragma once

#include <iostream>

class Integer

{

    friend std::ostream &operator<<(std::ostream &os, const Integer &integer);

public:

    Integer(int i);

    operator int();  //user-defined conversion

private:

    int i;

};

#include "Integer.h"

std::ostream &operator<<(std::ostream & os, const Integer & integer)

{

    os << integer.i;

    return os;

}

Integer::Integer(int i) : i(i) { }

Integer::operator int()

{

    return i;

}

#include "Integer.h"

int main()

{

    using namespace std;

    Integer integer = ;

    cout << "integer: " << integer << endl;

    int i = integer;

    cout << "i: " << i << endl;

    system("pause");

    return ;

}