QStringList in QObject::connect

[wysota]

Essentially you can't pass non-const references to a queued connection (as it doesn't make any sense). You'd have to use const QStringList& instead (but you wouldn't be able to change its contents). Using pointers is tricky too, because only a pointer is copied when the signal is emitted. If "in the meantime" (before the slot is executed) you delete the object, you'll end up with an invalid pointer and a possible segfault.

[DPinLV]

...and the same issue has already been solved in thread: QStringList with Signal/Slot.

Thanks, I noticed there was an existing thread when I received my subscriber email from QT regarding this thread. After looking at the existing thread on this subject I was able to get it working. I use the following which succeeds:

qRegisterMetaType<QStringList>("QStringList"); 
   QObject::connect (m_emitter_class,
                     SIGNAL(removeGamesSignal (int, const QStringList& )),
                     m_pkr_receiver_class,
                     SLOT(invokeGamesRemoval (int, const QStringList& )),
                     Qt::QueuedConnection);

qRegisterMetaType<QStringList>("QStringList"); 
   QObject::connect (m_emitter_class,
                     SIGNAL(removeGamesSignal (int, const QStringList& )),
                     m_pkr_receiver_class,
                     SLOT(invokeGamesRemoval (int, const QStringList& )),
                     Qt::QueuedConnection);

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I did not try the QVariant option mentioned in the previous thread since it seems like a matter of personal preference. If anyone disagrees please let me know why.

Essentially you can't pass non-const references to a queued connection (as it doesn't make any sense). You'd have to use const QStringList& instead (but you wouldn't be able to change its contents). Using pointers is tricky too, because only a pointer is copied when the signal is emitted. If "in the meantime" (before the slot is executed) you delete the object, you'll end up with an invalid pointer and a possible segfault.

Thanks for the explanation of what is going on under the covers with signals I appreciate that. I'm trying to learn what the Signals/Slots are doing as far as when they copy data, etc.
Thanks, wysota, jpn, and munna.