ref: 290c921d1d01119b7d4550770da06c491508508f
dir: /sys/src/cmd/python/Modules/rotatingtree.h/
/* "Rotating trees" (Armin Rigo)
*
* Google "splay trees" for the general idea.
*
* It's a dict-like data structure that works best when accesses are not
* random, but follow a strong pattern. The one implemented here is for
* access patterns where the same small set of keys is looked up over
* and over again, and this set of keys evolves slowly over time.
*/
#include <stdlib.h>
#define EMPTY_ROTATING_TREE ((rotating_node_t *)NULL)
typedef struct rotating_node_s rotating_node_t;
typedef int (*rotating_tree_enum_fn) (rotating_node_t *node, void *arg);
struct rotating_node_s {
void *key;
rotating_node_t *left;
rotating_node_t *right;
};
void RotatingTree_Add(rotating_node_t **root, rotating_node_t *node);
rotating_node_t* RotatingTree_Get(rotating_node_t **root, void *key);
int RotatingTree_Enum(rotating_node_t *root, rotating_tree_enum_fn enumfn,
void *arg);