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/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef TREE_H
#define TREE_H
struct AVTreeNode;
/**
* Finds an element.
* @param root a pointer to the root node of the tree
* @param next if next is not NULL then next[0] will contain the previous element and
* next[1] the next element if either doesnt exist then the corresponding
* entry in next is unchanged
* @return an element with cmp(key, elem)==0 or NULL if no such element exists in
* the tree
*/
void *av_tree_find(const struct AVTreeNode *root, void *key, int (*cmp)(void *key, const void *b), void *next[2]);
/**
* Finds a element for which cmp(key, elem)==0, if no such element is found key
* is inserted into the tree.
* @param rootp a pointer to a pointer to the root node of the tree note the
* root node can change during insertions, this is required to
* keep the tree balanced
*
* @return if no insertion happened, the found element
* if a insertion happened, then either key or NULL is returned (which it is
* depends on the tree state and the implemenattion, you should make no
* asumtations that its one or the other in code)
*/
void *av_tree_insert(struct AVTreeNode **rootp, void *key, int (*cmp)(void *key, const void *b));
void av_tree_destroy(struct AVTreeNode *t);
#endif /* TREE_H */
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