The QCollection class is the base class of all Qt collections. ... virtual uint  count  () const . ... virtual GCI  newItem  ( GCI )  . ... The QCollection class is an abstract base class for the Qt collection classes QDict , QList etc. via QGDict , QGList etc. A QCollection knows only about the number of objects in the collection and the deletion strategy . ... The template (or macro) classes that create the real collections cast the GCI to the required type. See also: Collection Classes . ...