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#ifndef SG_SCREEN
#define SG_SCREEN
#include <ostream>
#include <string>
typedef unsigned int mm;
class Screen {
public:
virtual ~Screen();
mm getHeight() const;
mm getWidth() const;
friend std::ostream& operator<<(std::ostream& ostr, const Screen& screen);
protected:
mm width;
mm height;
Screen(mm width, mm height);
virtual std::string extraOutput() const = 0;
};
std::ostream& operator<<(std::ostream& ostr, const Screen& screen);
#endif /* SG_SCREEN */
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