QDataStream and long double

Loc888

How do i save a long double? I tried this but it will crash when i save or load the file.

QDataStream &operator<<(QDataStream &out, long double data)
{
return out << data;
}

QDataStream &operator>>(QDataStream &in, long double &data)
{
return in >> data;
}

I tried to look it up, but no data.

mrjj

Hi
long double is not directly supported.

It crases as it will call itself over and over until stack overflow as
your function is the only operator << that takes a long double.

But before you fight this more. please do

qDebug() << sizeof(long double);
qDebug() << sizeof(double);

and see if it even matters as this is very much platform-dependent and might report the same size
and you can just use double.

Loc888

Ther's a huge difference, on 32bits double is 8, long double is 12, on 64 bits double is still 8, but long double is 16. Where is any info how to add it?

Kent-Dorfman

AUTOSAR-A0-4-2 rule for safety critical c++ applications:

Type long double shall not be used.

The width of long double type, and therefore width of the significand, is implementation defined.