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#pragma lib "libavl.a"
#pragma src "/sys/src/libavl"
typedef struct Avl Avl;
typedef struct Avltree Avltree;
typedef struct Avlwalk Avlwalk;
#pragma incomplete Avltree
#pragma incomplete Avlwalk
struct Avl
{
Avl *p; /* parent */
Avl *n[2]; /* children */
int bal; /* balance bits */
};
Avl *avlnext(Avlwalk *walk);
Avl *avlprev(Avlwalk *walk);
Avlwalk *avlwalk(Avltree *tree);
void deleteavl(Avltree *tree, Avl *key, Avl **oldp);
void endwalk(Avlwalk *walk);
void insertavl(Avltree *tree, Avl *new, Avl **oldp);
Avl *lookupavl(Avltree *tree, Avl *key);
Avltree *mkavltree(int(*cmp)(Avl*, Avl*));
Avl* searchavl(Avltree *tree, Avl *key, int neighbor);
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