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diff --git a/source4/include/adt_tree.h b/source4/include/adt_tree.h
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+/*
+ * Unix SMB/CIFS implementation.
+ * Generic Abstract Data Types
+ * Copyright (C) Gerald Carter 2002.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef ADT_TREE_H
+#define ADT_TREE_H
+
+typedef struct _tree_node {
+ struct _tree_node *parent;
+ struct _tree_node **children;
+ int num_children;
+ char *key;
+ void *data_p;
+} TREE_NODE;
+
+typedef struct _tree_root {
+ TREE_NODE *root;
+ int (*compare)(void* x, void *y);
+ void (*free)(void *p);
+} SORTED_TREE;
+
+#endif