What is the type used for in QListWidgetItem, QTreeWidgetItem, QTableWidgetItem? I see that it is used as an argument in all their constructors, with an option for UserType's, but don't know what this does or what is useful for. Seems to have something to do with rtti?

Qt Code: 
  1. QListWidgetItem(QListWidget *view = 0, int type = Type);
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