// File: HStack2.h
//
// A heterogeneous stack, derived from HList.h
//
// This version has code in a .h file !!!! Bad!
//

#ifndef HSTACK_H
#define HSTACK_H

#include "HList.h"

class HStack : private HList {
public:
   // Constructors
   HStack () { } 
   HStack (const HStack& S) : HList(S) { }

   // Destructor
   ~HStack() { }

   // Assignment
   const HStack& operator=(const HStack& rhs) {
       HList::operator=(rhs) ;
       return *this ;
   }

   // Stack operations
   void push(HNode *ptr) { 
      push_front(ptr) ; 
   }
   void pop() { 
      pop_front() ; 
   }
   HNode *top() { 
      front() ; 
   }

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


ostream& operator<< (ostream& os, const HStack& S) {
   S.print(os) ; 
   return os ;
}

#endif