[Qt-interest] Making a template class a Q_OBJECT

[Malyushytsky, Alex]

Discussed number of times on the list.
One of the useful link:
http://doc.trolltech.com/qq/qq15-academic.html


It is a good idea to google for 'Q_OBJECT template' before posting.

Regards,
   Alex




-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of John Clayton
Sent: Tuesday, December 15, 2009 3:10 PM
To: qt-interest
Subject: [Qt-interest] Making a template class a Q_OBJECT

Hi All

I'm wondering how I can make my template class a Q_OBJECT type.

I've got a template, defined like this:

template<typename T = QGraphicsObject>
class PreviewGraphicsItem : public T, // must be some kind of QObject
                        public PreviewBase,
                        public ControlPoint::Delegate
{

// Q_OBJECT
// the above line will cause compiler errors - wonder what the work-
around is?

public:
        // magic stuff goes here...
};


What I really want to do is put a Q_OBJECT decl just above the public:
access specifier, but that doesn't work (compiler complains bitterly).

The class defines common functionality for an object that sits in a
preview window (within a graphics scene).  It will always have a
template parameter that is derived from QObject.

The reason I want to put the Q_OBJECT macro in there, is because I'd
like to implement Q_PROPERTY statements at this level in the hierarchy.

Your ideas are appreciated,

Thanks
--
John Clayton


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