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28 lines
901 B
28 lines
901 B
/* "Rotating trees" (Armin Rigo)
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*
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* Google "splay trees" for the general idea.
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*
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* It's a dict-like data structure that works best when accesses are not
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* random, but follow a strong pattern. The one implemented here is for
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* access patterns where the same small set of keys is looked up over
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* and over again, and this set of keys evolves slowly over time.
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*/
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#include <stdlib.h>
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#define EMPTY_ROTATING_TREE ((rotating_node_t *)NULL)
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typedef struct rotating_node_s rotating_node_t;
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typedef int (*rotating_tree_enum_fn) (rotating_node_t *node, void *arg);
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struct rotating_node_s {
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void *key;
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rotating_node_t *left;
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rotating_node_t *right;
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};
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void RotatingTree_Add(rotating_node_t **root, rotating_node_t *node);
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rotating_node_t* RotatingTree_Get(rotating_node_t **root, void *key);
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int RotatingTree_Enum(rotating_node_t *root, rotating_tree_enum_fn enumfn,
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void *arg);
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