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/*
* Wrapper for list.h that keeps track of number of items.
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* @file
*
* Circular list that keep track of stats about the list.
*
* Currenly only count of abjects currently in list
* is kept track of. The plan was to track more,
* like max, but it was not useful enough.
*/
#ifndef _USUAL_STATLIST_H_
#define _USUAL_STATLIST_H_
#include <usual/list.h>
/**
* Header structure for StatList.
*/
struct StatList {
/** Actual list head */
struct List head;
/** Count of objects currently in list */
int cur_count;
#ifdef LIST_DEBUG
/** List name */
const char *name;
#endif
};
/** Define and initialize StatList head */
#ifdef LIST_DEBUG
#define STATLIST(var) struct StatList var = { {&var.head, &var.head}, 0, #var }
#else
#define STATLIST(var) struct StatList var = { {&var.head, &var.head}, 0 }
#endif
/** Add to the start of the list */
static inline void statlist_prepend(struct StatList *list, struct List *item)
{
list_prepend(&list->head, item);
list->cur_count++;
}
/** Add to the end of the list */
static inline void statlist_append(struct StatList *list, struct List *item)
{
list_append(&list->head, item);
list->cur_count++;
}
/** Remove element from the list */
static inline void statlist_remove(struct StatList *list, struct List *item)
{
list_del(item);
list->cur_count--;
/* Assert(list->cur_count >= 0); */
}
/** Initialize StatList head */
static inline void statlist_init(struct StatList *list, const char *name)
{
list_init(&list->head);
list->cur_count = 0;
#ifdef LIST_DEBUG
list->name = name;
#endif
}
/** return number of elements currently in list */
static inline int statlist_count(const struct StatList *list)
{
/* Assert(list->cur_count > 0 || list_empty(&list->head)); */
return list->cur_count;
}
/** remove and return first element */
static inline struct List *statlist_pop(struct StatList *list)
{
struct List *item = list_pop(&list->head);
if (item)
list->cur_count--;
/* Assert(list->cur_count >= 0); */
return item;
}
/** Return first element */
static inline struct List *statlist_first(const struct StatList *list)
{
return list_first(&list->head);
}
/** Return last element */
static inline struct List *statlist_last(const struct StatList *list)
{
return list_last(&list->head);
}
/** Is list empty */
static inline bool statlist_empty(const struct StatList *list)
{
return list_empty(&list->head);
}
/** Loop over list */
#define statlist_for_each(item, list) list_for_each(item, &((list)->head))
/** Loop over list backwards */
#define statlist_for_each_reverse(item, list) list_for_each_reverse(item, &((list)->head))
/** Loop over list safely, so that elements can be removed during */
#define statlist_for_each_safe(item, list, tmp) list_for_each_safe(item, &((list)->head), tmp)
/** Loop over list backwards safely, so that elements can be removed during */
#define statlist_for_each_reverse_safe(item, list, tmp) list_for_each_reverse_safe(item, &((list)->head), tmp)
/** Put intem before another */
static inline void statlist_put_before(struct StatList *list, struct List *item, struct List *pos)
{
list_append(pos, item);
list->cur_count++;
}
/** Put item after another */
static inline void statlist_put_after(struct StatList *list, struct List *item, struct List *pos)
{
list_prepend(pos, item);
list->cur_count++;
}
#endif /* __LIST_H_ */
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