fifo_list.h

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#ifndef FIFO_LIST_H
#define FIFO_LIST_H

#ifndef NULL
#define NULL 0
#endif

/*===============================<o>=====================================

Copyright 1996, 1997, 2004 Ian Kaplan, Bear Products International,
www.bearcave.com.

All Rights Reserved

You may use this software in software components for which you do
not collect money (e.g., non-commercial software).  All commercial
use is reserved.

===============================<o>=====================================*/


template <class T>
class FIFO_LIST
{
public:
    typedef struct LIST_TYPE {
        T data;
        struct LIST_TYPE *next;
    } list_type;  // struct list_type

private:
  list_type *list;
  list_type *tail;

public:
  typedef list_type *handle;

public:
  FIFO_LIST(void) 
  { 
    list = NULL;
    tail = NULL;
  }

  void dealloc(void)
  {
    while ( remove() != NULL )
      /* nada */;
  } // dealloc


  void add( T data )
  {
    list_type *t;
    
    t = new list_type;
    t->data = data;
    t->next = NULL;
    if (list == NULL) {
      list = t;
      tail = t;
    }
    else {
      tail->next = t;
      tail = t;
    }
  }  // add


  void reverse(void)
  {
    list_type *elem, *prev, *next;

    prev = NULL;
    next = NULL;

    tail = list;
    for (elem = list; elem != NULL; prev = elem, elem = next) {
      next = elem->next;
      elem->next = prev;
    } // for 
    list = prev;
  }  // reverse


  unsigned int length(void)
  {
      list_type *elem;
      unsigned int cnt = 0;

      for (elem = list; elem != NULL; elem = elem->next)
          cnt++;
      return cnt;
  }  // lenght

  handle remove(void)
  {
    list_type *t;

    if (list != NULL) {
      t = list;
      list = t->next;
      delete t;
    }

    if (list == NULL)
        tail = NULL;

    return list;
  } // remove


  T get_item( handle h)
  {

    return h->data;
  } // get_item


  handle first(void)
  {
    return list;
  } // first


  handle next(handle h)  
  {
    list_type *next = NULL;

    if (h != NULL) {
        next = h->next;
    }

    return next;
  } // next
  
};  // template class LIST


#endif

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