my_tree.h
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:2k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA */
- #ifndef _tree_h
- #define _tree_h
- #ifdef __cplusplus
- extern "C" {
- #endif
- #define MAX_TREE_HIGHT 40 /* = max 1048576 leafs in tree */
- #define ELEMENT_KEY(tree,element)
- (tree->offset_to_key ? (void*)((byte*) element+tree->offset_to_key) :
- *((void**) (element+1)))
- #define tree_set_pointer(element,ptr) *((byte **) (element+1))=((byte*) (ptr))
- typedef enum { left_root_right, right_root_left } TREE_WALK;
- typedef uint32 element_count;
- typedef int (*tree_walk_action)(void *,element_count,void *);
- #ifdef MSDOS
- typedef struct st_tree_element {
- struct st_tree_element *left,*right;
- unsigned long count;
- uchar colour; /* black is marked as 1 */
- } TREE_ELEMENT;
- #else
- typedef struct st_tree_element {
- struct st_tree_element *left,*right;
- uint32 count:31,
- colour:1; /* black is marked as 1 */
- } TREE_ELEMENT;
- #endif /* MSDOS */
- typedef struct st_tree {
- TREE_ELEMENT *root,null_element;
- TREE_ELEMENT **parents[MAX_TREE_HIGHT];
- uint offset_to_key,elements_in_tree,size_of_element;
- qsort_cmp compare;
- MEM_ROOT mem_root;
- my_bool with_delete;
- void (*free)(void *);
- } TREE;
- /* Functions on hole tree */
- void init_tree(TREE *tree,uint default_alloc_size, int element_size,
- qsort_cmp compare, my_bool with_delete,
- void (*free_element)(void*));
- void delete_tree(TREE*);
- #define is_tree_inited(tree) ((tree)->root != 0)
- /* Functions on leafs */
- TREE_ELEMENT *tree_insert(TREE *tree,void *key,uint key_size);
- void *tree_search(TREE *tree,void *key);
- int tree_walk(TREE *tree,tree_walk_action action,
- void *argument, TREE_WALK visit);
- int tree_delete(TREE *tree,void *key);
- #ifdef __cplusplus
- }
- #endif
- #endif