53bf5c497f
- Add LICENSES directory - Download additional licenses used - Add .reuse directory - Add doc about SPDX/reuse Co-authored-by: Florian Märkl <info@florianmaerkl.de>
56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
// SPDX-FileCopyrightText: 2016 Jeffrey Crowell
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// SPDX-License-Identifier: BSD-3-Clause
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// Skiplists are a probabilistic datastructure than can be used as a k-v store
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// with average case O(lg n) lookup time, and worst case O(n).
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// https://en.wikipedia.org/wiki/Skip_list
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#ifndef RZ_SKIP_LIST_H
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#define RZ_SKIP_LIST_H
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#include <rz_list.h>
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typedef struct rz_skiplist_node_t {
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void *data; // pointer to the value
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struct rz_skiplist_node_t **forward; // forward pointer
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} RzSkipListNode;
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typedef struct rz_skiplist_t {
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RzSkipListNode *head; // list header
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int list_level; // current level of the list.
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int size;
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RzListFree freefn;
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RzListComparator compare;
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} RzSkipList;
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RZ_API RzSkipList *rz_skiplist_new(RzListFree freefn, RzListComparator comparefn);
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RZ_API void rz_skiplist_free(RzSkipList *list);
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RZ_API void rz_skiplist_purge(RzSkipList *list);
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RZ_API RzSkipListNode *rz_skiplist_insert(RzSkipList *list, void *data);
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RZ_API bool rz_skiplist_delete(RzSkipList *list, void *data);
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RZ_API bool rz_skiplist_delete_node(RzSkipList *list, RzSkipListNode *node);
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RZ_API RzSkipListNode *rz_skiplist_find(RzSkipList *list, void *data);
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RZ_API RzSkipListNode *rz_skiplist_find_geq(RzSkipList *list, void *data);
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RZ_API RzSkipListNode *rz_skiplist_find_leq(RzSkipList *list, void *data);
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RZ_API void rz_skiplist_join(RzSkipList *l1, RzSkipList *l2);
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RZ_API void *rz_skiplist_get_first(RzSkipList *list);
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RZ_API void *rz_skiplist_get_n(RzSkipList *list, int n);
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RZ_API void *rz_skiplist_get_geq(RzSkipList *list, void *data);
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RZ_API void *rz_skiplist_get_leq(RzSkipList *list, void *data);
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RZ_API bool rz_skiplist_empty(RzSkipList *list);
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RZ_API RzList *rz_skiplist_to_list(RzSkipList *list);
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#define rz_skiplist_islast(list, el) (el->forward[0] == list->head)
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#define rz_skiplist_length(list) (list->size)
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#define rz_skiplist_foreach(list, it, pos) \
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if (list) \
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for (it = list->head->forward[0]; it != list->head && ((pos = it->data) || 1); it = it->forward[0])
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#define rz_skiplist_foreach_safe(list, it, tmp, pos) \
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if (list) \
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for (it = list->head->forward[0]; it != list->head && ((pos = it->data) || 1) && ((tmp = it->forward[0]) || 1); it = tmp)
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#endif // RZ_SKIP_LIST_H
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