(TOFU to keep full version of original solution without hiding my reply)
I am not sure how your initial project looks, but for the code you sent, I would suggest a different approach:
class Worker
{
public:
int doHeavyStuff()
{
return 42;
}
};
class Handler
{
public:
Handler()
: m_worker( new Worker )
{ }
QFuture<int> meaningOfLife()
{
return QtConcurrent::run( m_worker, &Worker::doHeavyStuff );
}
private:
Worker *m_worker;
};
NOTE: This code snippet is untested, it is based on this article:
http://doc.qt.io/qt-4.8/qtconcurrentrun.html
If your application is as simple as above, you might even drop the Handler class (as it does almost nothing now).
Am 10.07.2015 um 12:51 schrieb Lorenz Haas:
Hi,
I try to use QFuture/QFutureWatcher for my own project. So far I have
this simplified setting, in which Handler is living in the GUI thread:
class Worker : public QObject
{
Q_OBJECT
public slots:
void doHeavyStuff(QFutureInterface<int> inter) {
inter.reportResult(42);
inter.reportFinished();
}
};
class Handler : public QObject
{
Q_OBJECT
public:
Handler(QObject *parent = 0) :
QObject(parent),
m_worker(new Worker)
{
m_worker->moveToThread(&m_thread);
connect(&m_thread, &QThread::finished, m_worker,
&QObject::deleteLater);
m_thread.start();
}
QFuture<int> meaningOfLife()
{
QFutureInterface<int> inter;
inter.reportStarted();
QMetaObject::invokeMethod(m_worker, "doHeavyStuff",
Qt::QueuedConnection, Q_ARG(QFutureInterface<int>, inter));
return inter.future();
}
private:
Worker *m_worker;
QThread m_thread;
};
This works fine if I add "qRegisterMetaType<QFutureInterface<int>
>("QFutureInterface<int>");" somewhere. This, however, makes me nervous
because it feels like I have not to do this. It's a pure paranoid feeling...
Therefore:
a) Is the approach above okay?
b) Why QFutureInterface isn't registered already by Qt? Is it because
one can't register templated classes easily?
[...]
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