working with Q_PROPERTY QPair and QList

bnogal

working with Qt5.4.2

i had to add support to a QVariant based serializer, so it can work with QList<QPair<T1, T2> > being T1 and T2 QVariant compatible. The data to serialize is defined as Q_PROPERTY of QObjects

first I found out that Q_PROPERTY dont allow to write a comma on the type... as it recognize it as two parameters.

So i did a workaround using a macro
#define COMMA ,
and defining the Q_PROPERTY as Q_PROPERTY(QPair<qreal COMMA qreal> ...

but still, i got "Unable to handle unregistered datatype" when trying to read the property...

so i had to register:

qRegisterMetaType<QPair<qreal,qreal> >("QPair<qreal,qreal>");

and got: "unable to save type/unable to load type", so i added
qRegisterMetaTypeStreamOperators<QPair<qreal,qreal> >();

And the QPair started to work, just qreal,qreal, of course...

to make QList<QPair<qreal,qreal> > work... i had to register it again as:

qRegisterMetaType<QList<QPair<qreal,qreal> > >("QList<QPair<qreal,qreal> >"); 
qRegisterMetaTypeStreamOperators<QList<QPair<qreal,qreal> > >();

from this point, everything works perfect, but just for QPair<qreal,qreal> and using an awful macro

could it work without any workaround and registering types?

i think that having moc step, it should be easy to remove the COMMA workaround.

, the same for qRegisterMetaType....

or i am overthinking it and there is a straight and easy way...

SGaist

Hi,

What about:

typedef QPair<qreal, qreal> YourClassName;
typedef QList<YourClassName> YourClassNameList;

Then you can use them more easily

Hope it helps

bnogal

Hi, thx for the reply.

yes, it is another option, and maybe i should jump to use structs straight. As you never know how it will need to grow

but anyway, someone knows where is the moc compiler code?, i am trying to find it... but no success. Just to take a look

SGaist

In the bin folder of your Qt Installation