#ifndef TIMER_H
#define TIMER
#include <iostream> //for class ostream
#include <iomanip>  //for the i/o manipulator setw
using namespace std;

class timer {
	int hours;
	int minutes;
	int seconds;
public:
	timer(int h, int m, int s): hours {h}, minutes {m}, seconds {s} {}
	~timer() {cout << "Time's up!\n";}

	timer& operator--();   //prefix decrement, too big to be inline
	operator int() const {return seconds + 60 * (minutes + 60 * hours);}

	friend ostream& operator<<(ostream& ost, const timer& t) {
		//Output each value as a two-digit number.
		return ost << setfill('0')
			   << setw(2) << t.hours   << ":"
			   << setw(2) << t.minutes << ":"
			   << setw(2) << t.seconds;
	}
};

inline const timer operator--(timer& t, int)    //postfix decrement
{
	const timer old {t};
	--t;   //d.operator--(); //calls prefix decrement to do most of its work
	return old;
}
#endif