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-rw-r--r--include/my_tree.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/my_tree.h b/include/my_tree.h
index 8b326a19518..7cc7c615ba6 100644
--- a/include/my_tree.h
+++ b/include/my_tree.h
@@ -76,6 +76,8 @@ int tree_walk(TREE *tree,tree_walk_action action,
void *argument, TREE_WALK visit);
int tree_delete(TREE *tree,void *key);
+#define TREE_ELEMENT_EXTRA_SIZE (sizeof(TREE_ELEMENT) + sizeof(void*))
+
#ifdef __cplusplus
}
#endif