main.cpp

#include <iostream>

#include "ScreenTemplate.hpp"

int main ()
{
    ScreenTemplate <800, 600> screen1;

    std::cout << screen1 << std::endl;

    std::cin >> screen1;

    std::cout << screen1 << std::endl;

    return 0;
}

ScreenTemplate.hpp

#pragma once

#include <iostream>

template <unsigned, unsigned> class ScreenTemplate;

template <unsigned getH, unsigned getW>
std::ostream &operator << (std::ostream &, const ScreenTemplate <getH, getW> &);

template <unsigned getH, unsigned getW>
std::istream &operator >> (std::istream &,       ScreenTemplate <getH, getW> &);

template <unsigned H, unsigned W>
class ScreenTemplate {
    friend std::ostream &operator << <H, W> (std::ostream &, const ScreenTemplate <H, W> &);
    friend std::istream &operator >> <H, W> (std::istream &,       ScreenTemplate <H, W> &);

public:

    ScreenTemplate (const unsigned &, const unsigned &);
    ScreenTemplate ();

    unsigned getHeight () const;
    unsigned getWidth () const;

    ScreenTemplate &setHeight (const unsigned &);
    ScreenTemplate &setWidth (const unsigned &);

private:
    unsigned height, width;
};

template <unsigned H, unsigned W>
std::ostream &operator << (std::ostream &os, const ScreenTemplate <H, W> &rho) {
    os << rho.height << " " << rho.width;
    return os;
}

template <unsigned H, unsigned W>
std::istream &operator >> (std::istream &is,       ScreenTemplate <H, W> &rho) {
    is >> rho.height >> rho.width;
    if (!is)
        rho = ScreenTemplate <H, W> ();

    return is;
}

template <unsigned H, unsigned W>
ScreenTemplate <H, W>::ScreenTemplate () :
                                height (H), width (W) { }

template <unsigned H, unsigned W>
ScreenTemplate <H, W>::ScreenTemplate (const unsigned &h, const unsigned &w) :
                                height (h), width (w) { }

template <unsigned H, unsigned W>
unsigned ScreenTemplate <H, W>::getHeight () const {
    return height;
}

template <unsigned H, unsigned W>
unsigned ScreenTemplate <H, W>::getWidth () const {
    return width;
}

template <unsigned H, unsigned W>
ScreenTemplate <H, W> &ScreenTemplate <H, W>::setHeight (const unsigned &getHeight) {
    this->height = getHeight;
    return *this;
}

template <unsigned H, unsigned W>
ScreenTemplate <H, W> &ScreenTemplate <H, W>::setWidth (const unsigned &getWidth) {
    this->width = getWidth;
    return *this;
}