On Po, 2014-09-29 at 11:28 +0800, Jianhai Luan wrote: Another possibility would be to use long instead of unsigned int type. It is debatable which one is more correct though. For future extensibility (if we add some field that could get negative values), I would prefer using long. -- Tomas Mraz No matter how far down the wrong road you've gone, turn back. Turkish proverb (You'll never know whether the road is wrong though.)