// File: HStack.h
//
// A heterogeneous stack, derived from HList.h
//

#ifndef HSTACK_H
#define HSTACK_H

#include "HList.h"

class HStack : private HList {

public:
   // Constructors
   HStack () ;
   HStack (const HStack& S) ;

   // Destructor
   ~HStack() ;

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

   // Stack operations
   void push(HNode *ptr) ;
   void pop() ;
   HNode *top() ;

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

ostream& operator<< (ostream& os, const HStack& S)  ;

#endif