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avutil/tree: Document the guaranteed ordering of compare arguments for av_tree_find()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2015-10-25 17:13:42 +01:00
parent 9bc3d3355f
commit 65ffca9f80
1 changed files with 3 additions and 0 deletions
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libavutil/tree.h
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@ -58,6 +58,9 @@ struct AVTreeNode *av_tree_node_alloc(void);
* then the corresponding entry in next is unchanged.
* @param cmp compare function used to compare elements in the tree,
* API identical to that of Standard C's qsort
* It is guranteed that the first and only the first argument to cmp()
* will be the key parameter to av_tree_find(), thus it could if the
* user wants, be a different type (like an opaque context).
* @return An element with cmp(key, elem) == 0 or NULL if no such element
* exists in the tree.
*/