#ifndef _BINARY_SEARCH_TREE_H
#define _BINARY_SEARCH_TREE_H

struct TreeNode;
typedef struct TreeNode *Position;
typedef struct TreeNode *SearchTree;
typedef int elem_t;

SearchTree make_empty(SearchTree t);
Position find(elem_t x, SearchTree t);
Position find_min(SearchTree t);
Position find_max(SearchTree t);
SearchTree insert(elem_t x, SearchTree t);
SearchTree delete(elem_t x, SearchTree t);
elem_t retrieve(Position p);

#endif  /* _BINARY_SEARCH_TREE_H */