I need to update the GUI from multiple threads. So far I've taken the following approach:
Qt Code: 
  1. connect(this, SIGNAL(setGUILabel(QString)), label, SLOT(setText(QString const&)), Qt::QueuedConnection);
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and it works... What bothers me is that the argument of the signal is of QString type (so that I make a copy of the string in the signal issuing thread), but the argument of the slot is QString const&. Is this mixing of references and object types allowed by Qt?