#include <thread>   //for this_thread
#include <chrono>   //for seconds
#include "timer.h"
using namespace std;

//Count down one second.

timer& timer::operator--()   //prefix decrement
{
	if (--seconds < 0) {
		seconds = 60 - 1;
		if (--minutes < 0) {
			minutes = 60 - 1;
			--hours;
		}
	}

	this_thread::sleep_for(chrono::seconds(1));
	return *this;
}