[Development] Weird offseting in QDataStream

[Andreas Aardal Hanssen]

On 08 Nov 2013, at 10:15, Yves Bailly <yves.bailly at sescoi.fr> wrote:
> Le 08/11/2013 10:05, Giuseppe D'Angelo a écrit :
>> See QDataStream::setFloatingPointPrecision. The default is double.
> That's pretty strange... what if I want to read a float then a double? do I
> have to switch between the two each time?
> Does this means it's impossible to use code like this:
> float f;
> double d;
> datastream >> f >> d;

QDataStream stores your content in a portable binary format. Specifying the floating point precision makes it clear that real numbers, be them represented in floats or doubles in C++, are stored as floats or doubles in file.

If you want to store a float as a float, and then a double as a double, you need to change the precision of QDataStream in between calls. Plus, the code that reads the file must match the code that wrote the stream.

Andreas