On Friday 08 November 2013 11:03:40 André Somers wrote: > Olivier Goffart schreef op 8-11-2013 10:57: > > It was changed in Qt 4.6 for compatibility with qreal that > > can be float or double depending on the platform. > > Perhaps one could add a > > QDataStream::FloatingPointPrecision::AutoPrecision, > > that would not be a bad idea. > > What would that mode do, exactly? Isn't the whole point that qreal may > be defined as float or double, and thus you don't know how it will be > stored in QDataStream? You cannot detect which meaning of qreal was used > when the file was written... Or do you mean that it should be something > like MixedPrecision or TypePrecision that would always use 4 bytes for > float and 8 for double again (and wreck havoc if you try to use qReal > for reading or writing)? That indeed would be good, I think. I think > it's a bit weird that in order to support streaming qreal, you basicaly > stop supporting reading and writing floats or doubles.
Yes, what I called AutoPrecision would be 8 bytes when passed a double, and 4 bytes when passed float. It would be a bad idea to use that mode with qreal typedef which can vary on the platform. (But qreal defaults to double on all the platform from Qt 5.2) -- Olivier Woboq - Qt services and support - http://woboq.com - http://code.woboq.org _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
