[Interest] Serializing QSensorReading derived classes

[Jason H]

I'd like to serialize these values.
QAcceleromterReading has x,y,z properties, but to serialize this one, the accelerometer mode should also be included.

But aside from that, I'm not clear on what I need to do. There's adding the QDataStream << >> (QDataScream stream, QSensorReading reading) operators. But that won't allow me to know what I'm reading, so I need to add a byte to know what I'm deserializing, which means I should really do it via QVariant in the QMetaType system. 
qRegisterMetaType() and DECLARE_META_TYPE(). However, when I do this I get:
qmetatype.h:766: error: call to implicitly-deleted copy constructor of 'QAltimeterReading'
            return new (where) T(*static_cast<const T*>(t));
                               ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
for each of the types. 

What can I do to get this to work without having to write (derive) my own classes?

I'm also wondering why this isn't supported already?