#ifndef LIST_OF_PEOPLE_H
#define LIST_OF_PEOPLE_H

//
//  ============================================================
//
//                  ListOfPeople
//			in an elevator simulator
//
//  ============================================================
//


#include "Person.h"

class ListOfPeople {

   private :

			//  Head and tail of the list

      Person			*_head,
				*_tail ;

			//  Private output function used by operator<<

      ostream& output ( ostream& ) const ;

   public :

		//  Constructors

      ListOfPeople () ;

		//  Copy Constructor

      ListOfPeople ( const ListOfPeople& ) ;

		//  Destructor

      virtual ~ListOfPeople () ;

		//  Assignment

      ListOfPeople& operator= ( const ListOfPeople& ) ;

		//  Comparison

      friend int operator== ( const ListOfPeople&, const 
      ListOfPeople& ) ;
      friend int operator!= ( const ListOfPeople&, const 
      ListOfPeople& ) ;

		//  Output

      friend ostream& operator<< ( ostream&, const ListOfPeople& ) ;

		//  How to get things onto the list: push onto the 
		//     front, or append onto the rear.

      void push ( const Person& ) ;
      void push ( Person* ) ;
      void append ( const Person& ) ;
      void append ( Person* ) ;

		//  Inquiry about the list

      int is_empty () const ;
      int is_not_empty () const ;

		//  Length of the list

      int length() const ;

		//  Total weight of the people on the list

      double weight() const ;

		//  Decrementing times for people.  Used as the
		//    clock ticks.

      void decrement_stay() ;
      void decrement_entry_time() ;

		//  Access the head of the list

      Person * head() const ;

		//  Remove a person from the list

      void remove ( Person * ) ;

		//  Remove a person from the front of the list

      Person * get () ;

		//  Remove the first person from the list who can
		//    go to a certain floor

      Person * get_for_floor ( const int ) ;
   } ;

#endif