// File: HQueue.h
//
// A heterogeneous FIFO queue, derived from HList.h
//
//

#ifndef HQUEUE_H
#define HQUEUE_H

#include "HList.h"

class HQueue : private HList {
public:
   // Constructors
   HQueue () ; 
   HQueue (const HQueue& Q) ;

   // Destructor
   ~HQueue() ;

   // Assignment
   const HQueue& operator=(const HQueue& rhs) ;

   // FIFO queue operations
   void enqueue(HNode *ptr) ;
   void dequeue() ;
   using HList::front ;

   // Expose some HList public members
   using HList::print ;
   using HList::size ;
} ;


ostream& operator<< (ostream& os, const HQueue& Q) ;

#endif