Question

Going through the phantomJS code i ran into this in the webpage.cpp file (line 315)

connect(m_networkAccessManager, SIGNAL(resourceRequested(QVariant)),
            SIGNAL(resourceRequested(QVariant)));

And i don’t quite understand how this works, i’m aware that you can connect signals to signals in Qt.
On the Qt documentation i found out that you can also connect signals directly to a method (http://doc.qt.io/qt-5/qobject.html#connect-2) , seeing that it’s a 3 parameters call i thought that this would be the desired function on the webpage.cpp code, but connecting a signal to the same signal…i got completely lost there, any help?

PD: not very experienced in Qt i should say, sorry if it’s a dumb question

Answer 1

Three parameters QObject::connect()

connect(m_networkAccessManager, SIGNAL(resourceRequested(QVariant)),
        SIGNAL(resourceRequested(QVariant)));

is an equivalent of

connect(m_networkAccessManager, SIGNAL(resourceRequested(QVariant)),
        this, SIGNAL(resourceRequested(QVariant)));

Thus, QNetworkAccessManager::resourceRequested(QVariant) is connected to WebPage::resourceRequested(QVariant) and cause the latter to be emitted every time when the former is emitted.

More details in Qt documentation