[SOLVED] Slot without Q_OBJECT

qtacc32

Hello,

I'd like to have a template class but unfortunately, it doesn't work with Q_OBJECT.
So I read about Q_INVOKABLE which would work I guess but be quite inconvenient.
I could connect signals to lambdas though and call the invokable methods from there.

My question: Why does Qt allow connecting to lambdas but not to non-QObject classes (which lambdas are too, not?)?

Thanks!

// EDIT:

I just realized that this works:

template<class T>
class Test2 : public QObject
{
	T t = 3;
public:
	void SltX()
	{
		std::cout << "Test2::SltX: " << t << std::endl;
	}
};

QObject::connect(&mainWindow, &MainWindow::SigTest, &t2, &Test2<int>::SltX);

I guess I can live with the downsides of not having Q_OBJECT (is there a complete list with all of them?).

// EDIT2:

Ou, cannot have signals :-/
Damn, will templates ever be supported? So important ...

SGaist

Hi,

Here you can find the reason about why there's that limitation with templates

JKSH

Qt developers have investigated this before, and there is a partially-working patch.

There are still a number of important challenges to work through, but devs are focussing on other things at the moment. It is not currently being actively worked on: http://comments.gmane.org/gmane.comp.lib.qt.devel/10327