What argument types for Signal/Slot?

[jacek]

Is this because I am using a QT type, QString?

No, it works, because you use a const reference. In case of queued connections, it works the same way as:

QObject::connect(m_emitter_class, 
                     SIGNAL(addParsedDataSignalQString(QString)),
                     m_pkr_receiver_class,
                     SLOT(addToTable___(QString)),
                     Qt::QueuedConnection);

QObject::connect(m_emitter_class, 
                     SIGNAL(addParsedDataSignalQString(QString)),
                     m_pkr_receiver_class,
                     SLOT(addToTable___(QString)),
                     Qt::QueuedConnection);

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