On Sunday 03 January 2010 12:42:42 Axel Jäger wrote: > > Concerning the float/double question: > > on most (all?) of our target platforms, float will have single-precision, > > where double offers double-precision. Of course, size differs and float > > might be faster on embedded platforms, like arm. I think, as long as we > > don't encounter any performance issues, because of matrices with really > > large dimensions, we should use double. > > If your main concern is bad performance on ARM, use qreal. It is a double > on all plattforms except ARM. It is used in QGraphicsView for nearly > everything. That was just an example ;) I'm aware of qreal and what it does (that is actually, why I choose this example here). I just wanted to make clear, that double might be a better choice, since float has only some limitations on a few (one for those Qt is running on) platforms. I don't see arm as a target platform for KTechLab (or do we expect widely deployment of arm-based netbooks any time and want to use KTechLab on them? May be, we should think about that.. ;)). The point is: float has limitations, most of our target platforms support double precision (and even long double) in hardware, so we should just use double, IMHO.
bye then julian
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