source: liacs/da/opdr1/queue.h@ 5

/* Author    : Rick van der Zwet
 * S-number  : 0433373
 * Version   : $Id: queue.h 211 2007-09-03 17:07:26Z rick $
 * Copyright : FreeBSD Licence
 */

#include "list.h"

/*
 * Class Queue general declarations
 */
class Queue {
    public:
        Queue ();
        virtual ~Queue (void);
        bool IsEmpty (void);
        /* pure virtual decleration see: http://tinyurl.com/2apd5n
         * http://en.wikipedia.org/wiki/Virtual_function# \
         * Abstract_classes_and_pure_virtual_functions
         */
        virtual void Insert (const int item) = 0;
        virtual int Get (void) = 0;

    protected:
        int Pop ();
        int Shift ();
        void Push (const int item);
        void SortBySize (const int item);
        void Unshift (const int item);
        List * lijst;
};

 
 /*
  * Class Fifo declarations
  */
 class Fifo: public Queue {
     public:
         // Push item to the end to the list
         void Insert (const int item) { Queue::Push (item); };
         //Remove the Item longest in the queue, return 0 when list empty
         int Get (void) { return( Queue::Shift() ) ; };
 };
 
 
 
 /*
  * Class Lifo declarations
  */
 class Lifo: public Queue {
     public:
         // Push item to the end to the list
         void Insert (const int item) { Queue::Push (item); };
         //Remove the Item which came the last in the queue, return 0
         //when list is empty
         int Get (void) { return( Queue::Pop() ); };
 };
 
 

/*
 * Class MinQ declarations
 */
class MinQ: public Queue {
    public:
        // Push item to the sorted list
        void Insert (const int item) { Queue::SortBySize (item); };
        //Remove the smallest item in the queue, return 0
        //when list is empty
        int Get (void) { return( Queue::Shift() ); };
};



/*
 * Class MaxQ declarations
 */
class MaxQ: public Queue {
    public:
        // Push item to the sorted list
        void Insert (const int item) { Queue::SortBySize (item); };
        //Remove the biggest item in the queue, return 0
        //when list is empty
        int Get (void) { return( Queue::Pop() ); };
};