From fbc37e7db420382d57964d7f8ba422373f50d9b3 Mon Sep 17 00:00:00 2001
From: Warren Dukes <warren.dukes@gmail.com>
Date: Thu, 24 Feb 2005 02:41:06 +0000
Subject: add 2-3 tree header file

git-svn-id: https://svn.musicpd.org/mpd/trunk@2982 09075e82-0dd4-0310-85a5-a0d7c8717e4f
---
 src/tree.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/tree.h

(limited to 'src/tree.h')

diff --git a/src/tree.h b/src/tree.h
new file mode 100644
index 000000000..deb420bc8
--- /dev/null
+++ b/src/tree.h
@@ -0,0 +1,51 @@
+#ifndef TREE_H
+#define TREE_H
+
+typedef struct _TreeNode {
+	void * data[2];
+	struct _TreeNode * children[3];
+	struct _TreeNode * parent;
+} TreeNode;
+
+typedef struct _Tree {
+	TreeNode headNode;
+	TreeFreeDataFunc * freeFunc;
+	TreeCompareDataFunc * compareFunc;
+} Tree;
+
+typedef enum _TreeIteratorType {
+	PREORDER,
+	INORDER,
+	POSTORDER
+} TreeIteratorType;
+
+typedef struct _TreeIterator {
+	Data * data;
+	/* private data */
+	TreeIteratorType type;
+	TreeNode * currentNode;
+	int pos;
+} TreeIterator;
+
+typedef int TreeCompareDataFunc(void * left, void * right);
+
+typedef int TreeFreeDataFunc(void * data);
+
+Tree * newTree(TreeFreeDataFunc * freeFunc, TreeCompareDataFunc * compareFunc);
+
+void freeTree(Tree * tree);
+
+int insertInTree(Tree * tree, void * data);
+
+int deleteFromTree(Tree * tree, void * needle);
+
+void * findInTree(Tree * tree, void * needle);
+
+TreeIterator * newTreeIterator(Tree * tree, TreeIteratorType type);
+
+/* will return the same pointer passed in on success
+ * if NULL is returned, this indicates the end of tree
+ */
+TreeIterator * nextTreeIterator(TreeIterator * iter);
+
+#endif // TREE_H
-- 
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