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67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
// (c) 2016 Jeffrey Crowell
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// BSD 3 Clause License
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// radare2
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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 R2_SKIP_LIST_H
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#define R2_SKIP_LIST_H
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#include <r_list.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct r_skiplist_node_t {
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void *data; // pointer to the value
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struct r_skiplist_node_t **forward; // forward pointer
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} RSkipListNode;
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typedef struct r_skiplist_t {
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RSkipListNode *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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RListFree freefn;
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RListComparator compare;
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} RSkipList;
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R_API RSkipList* r_skiplist_new(RListFree freefn, RListComparator comparefn);
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R_API void r_skiplist_free(RSkipList *list);
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R_API void r_skiplist_purge(RSkipList *list);
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R_API RSkipListNode* r_skiplist_insert(RSkipList* list, void* data);
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R_API bool r_skiplist_insert_autofree(RSkipList* list, void* data);
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R_API bool r_skiplist_delete(RSkipList* list, void* data);
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R_API bool r_skiplist_delete_node(RSkipList *list, RSkipListNode *node);
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R_API RSkipListNode* r_skiplist_find(RSkipList* list, void* data);
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R_API RSkipListNode* r_skiplist_find_geq(RSkipList* list, void* data);
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R_API RSkipListNode* r_skiplist_find_leq(RSkipList* list, void* data);
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R_API void r_skiplist_join(RSkipList *l1, RSkipList *l2);
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R_API void *r_skiplist_get_first(RSkipList *list);
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R_API void *r_skiplist_get_n(RSkipList *list, int n);
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R_API void* r_skiplist_get_geq(RSkipList* list, void* data);
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R_API void* r_skiplist_get_leq(RSkipList* list, void* data);
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R_API bool r_skiplist_empty(RSkipList *list);
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R_API RList *r_skiplist_to_list(RSkipList *list);
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#define r_skiplist_islast(list, el) (el->forward[0] == list->head)
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#define r_skiplist_length(list) (list->size)
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#define r_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 r_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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#ifdef __cplusplus
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}
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#endif
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#endif // R2_SKIP_LIST_H
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