/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/rap/raplist.h

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 * Copyright (c) 1993 Regents of the University of California.
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 *      Engineering Group at Lawrence Berkeley Laboratory.
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 *
 * Author:
 *   Mohit Talwar (mohit@catarina.usc.edu)
 *
 * $Header: /cvsroot/nsnam/ns-2/rap/raplist.h,v 1.4 2005/09/18 23:33:34 tomh Exp $
 * 
 * This is taken from UCB Nachos project
 * 
 * list.h 
 *      Data structures to manage LISP-like lists.  
 *
 *      As in LISP, a list can contain any type of data structure
 *      as an item on the list: IP addresses, pending interrupts etc.  
 *      That is why each item is a "void *", or in other words, 
 *      a "pointers to anything".
 */

#ifndef RAPLIST_H
#define RAPLIST_H

typedef void (*VoidFunctionPtr)(long arg); 
typedef int (*CompareFunction)(void *item, void *key);
 
// The following class defines a "List element" -- which is
// used to keep track of one item on a List.  It is equivalent to a
// LISP cell, with a "car" ("next") pointing to the next element on the List,
// and a "cdr" ("item") pointing to the item on the List.

class ListElement 
{
public:
  ListElement(void *itemPtr, float sortKey); // initialize a List element
  
  ListElement *next;            // next element on List, 
                                // NULL if this is the last
  float key;                    // priority (+ve), for a sorted List
                                // identification, for some
  void *item;                   // pointer to item on the List
};

// The following class defines a "List" -- a singly linked List of
// List elements, each of which points to a single item on the List.
//
// By using the "Sorted" functions, the List can be kept in sorted
// in increasing order by "key" in ListElement.

class List 
{
public:
  List();                       // Initialize the List
  ~List();                      // Deallocate the List
  
  void Prepend(void *item);     // Put item at the beginning of the List
  void Append(void *item);      // Put item at the end of the List
  void *Remove();               // Take item off the front of the List
  
  void Mapcar(VoidFunctionPtr func); // Apply "func" to every element 
                                     // on the List
  int IsEmpty();                // Is the List empty? 
  int Size() {return size;}     // Return the number of elements

  // Routines to put/get items on/off List in order (sorted by key)
  void SortedInsert(void *item, float sortKey); // Put item into List
  void *SortedRemove(float *keyPtr);            // Remove first item from List
  float MinKey();                               // sortKey of item at front

  // Routines to put/get items on/off a Set
  int SetInsert(void *key, CompareFunction eq);   // Put key into set
  void *SetRemove(void *key, CompareFunction eq);  // Remove key from set
  void *IsPresent(void *key, CompareFunction eq);  // Is key there in set
  void Purge(void *key, CompareFunction eq, VoidFunctionPtr destroy);
  
private:
  ListElement *first;           // Head of the List, NULL if List is empty
  ListElement *last;            // Last element of List
  int size;                     // Number of elements in the List 
};

#endif // RAPLIST_H