74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* bst/gsl_bst_avl.h
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*
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* Copyright (C) 2018 Patrick Alken
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __GSL_BST_AVL_H__
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#define __GSL_BST_AVL_H__
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#include <stdlib.h>
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#include <gsl/gsl_bst_types.h>
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#undef __BEGIN_DECLS
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#undef __END_DECLS
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#ifdef __cplusplus
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# define __BEGIN_DECLS extern "C" {
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# define __END_DECLS }
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#else
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# define __BEGIN_DECLS /* empty */
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# define __END_DECLS /* empty */
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#endif
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__BEGIN_DECLS
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#ifndef GSL_BST_AVL_MAX_HEIGHT
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#define GSL_BST_AVL_MAX_HEIGHT 32
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#endif
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/* AVL node */
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struct gsl_bst_avl_node
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{
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struct gsl_bst_avl_node *avl_link[2]; /* subtrees */
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void *avl_data; /* pointer to data */
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signed char avl_balance; /* balance factor */
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};
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/* tree data structure */
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typedef struct
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{
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struct gsl_bst_avl_node *avl_root; /* tree's root */
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gsl_bst_cmp_function *avl_compare; /* comparison function */
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void *avl_param; /* extra argument to |avl_compare| */
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const gsl_bst_allocator *avl_alloc; /* memory allocator */
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size_t avl_count; /* number of items in tree */
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unsigned long avl_generation; /* generation number */
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} gsl_bst_avl_table;
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/* AVL traverser structure */
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typedef struct
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{
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const gsl_bst_avl_table *avl_table; /* tree being traversed */
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struct gsl_bst_avl_node *avl_node; /* current node in tree */
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struct gsl_bst_avl_node *avl_stack[GSL_BST_AVL_MAX_HEIGHT]; /* all the nodes above |avl_node| */
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size_t avl_height; /* number of nodes in |avl_parent| */
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unsigned long avl_generation; /* generation number */
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} gsl_bst_avl_traverser;
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__END_DECLS
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#endif /* __GSL_BST_AVL_H__ */
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