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engines/ultima/nuvie/misc/iavl_tree.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef NUVIE_MISC_IAVL_TREE_H
+#define NUVIE_MISC_IAVL_TREE_H
+
+namespace Ultima {
+namespace Nuvie {
+
+/* typedef the keytype */
+// TODO: Clean up object manager so it isn't intermixing pointers and ints
+//typedef long iAVLKey;
+union iAVLKey {
+	void *_ptr;
+	long _int;
+};
+
+/* Comparison function for integers is subtraction. */
+#define iAVLKey_cmp(tree, a, b) ((a._int) - (b._int))
+
+
+typedef struct _iAVLNode {
+	iAVLKey key;
+	long depth;
+	void *item;
+	struct _iAVLNode *parent;
+	struct _iAVLNode *left;
+	struct _iAVLNode *right;
+} iAVLNode;
+
+
+typedef struct {
+	iAVLNode *top;
+	long count;
+	iAVLKey(*getkey)(const void *item);
+} iAVLTree;
+
+
+typedef struct {
+	const iAVLTree *avltree;
+	const iAVLNode *curnode;
+} iAVLCursor;
+
+
+extern iAVLTree *iAVLAllocTree(iAVLKey(*getkey)(void const *item));
+extern void iAVLFreeTree(iAVLTree *avltree, void (freeitem)(void *item));
+extern void iAVLCleanTree(iAVLTree *avltree, void (freeitem)(void *item));
+extern int iAVLInsert(iAVLTree *avltree, void *item);
+extern void *iAVLSearch(iAVLTree const *avltree, iAVLKey key);
+extern int iAVLDelete(iAVLTree *avltree, iAVLKey key);
+extern void *iAVLFirst(iAVLCursor *avlcursor, iAVLTree const *avltree);
+extern void *iAVLNext(iAVLCursor *avlcursor);
+
+} // End of namespace Nuvie
+} // End of namespace Ultima
+
+#endif