The QQueue class is a template class that provides a queue. ... QQueue  ( const QQueue<type> & queue )  . ... QQueue<type>&  operator=  ( const QQueue<type> & queue )  . bool  autoDelete  () const . ... bool  isEmpty  () const . void  enqueue  ( const type * d )  . ... A stack is a collection that can be used to enqueue and dequeue items. ... Returns a reference to the first item in the queue. ... Last in, last out. ... Assigns queue to this queue and returns a reference to this queue. ...