Initial community commit

Src/nu/RedBlackTree.h

@@ -0,0 +1,77 @@
+#pragma once
+// http://web.mit.edu/~emin/www/source_code/cpp_trees/index.html
+
+class RedBlackTreeNode
+{
+public:
+	typedef int key_t;
+	typedef void *val_t;
+	friend class RedBlackTree;
+public:
+	RedBlackTreeNode();
+	RedBlackTreeNode(key_t, val_t);
+	val_t GetEntry() const;
+	~RedBlackTreeNode();
+protected:
+	val_t storedEntry;
+	key_t key;
+	int red; /* if red=0 then the node is black */
+	RedBlackTreeNode *left;
+	RedBlackTreeNode *right;
+	RedBlackTreeNode *parent;
+};
+class RedBlackTree;
+
+class RedBlackTreeIterator
+{
+public:
+	friend RedBlackTree;
+	typedef int key_t;
+	typedef void *val_t;
+	RedBlackTreeIterator() : node(0), tree(0) {}
+	RedBlackTreeIterator(RedBlackTreeNode *_node, RedBlackTree *_tree) : node(_node), tree(_tree) {}
+	void next();
+	bool get(val_t *val);
+private:
+	RedBlackTreeNode *node;
+	RedBlackTree *tree;
+};
+
+class RedBlackTree
+{
+public:
+	typedef int key_t;
+	typedef void *val_t;
+public:
+	RedBlackTree();
+	~RedBlackTree();
+
+	RedBlackTreeIterator end();
+	RedBlackTreeIterator Insert(key_t, val_t);
+	RedBlackTreeIterator Search(key_t key);
+	RedBlackTreeIterator begin();
+// semi-public:
+	void Delete(key_t key);
+	val_t DeleteNode(RedBlackTreeNode *);
+	RedBlackTreeNode *GetPredecessorOf(RedBlackTreeNode *) const;
+	RedBlackTreeNode *GetSuccessorOf(RedBlackTreeNode *) const;
+	size_t size() const;
+
+	//TemplateStack<RedBlackTreeNode *> * Enumerate(int low, int high) ;
+protected:
+	/*  A sentinel is used for root and for nil.  These sentinels are */
+	/*  created when RedBlackTreeCreate is caled.  root->left should always */
+	/*  point to the node which is the root of the tree.  nil points to a */
+	/*  node which should always be black but has aribtrary children and */
+	/*  parent and no key or info.  The point of using these sentinels is so */
+	/*  that the root and nil nodes do not require special cases in the code */
+	RedBlackTreeNode *root;
+	RedBlackTreeNode *nil;
+	void LeftRotate(RedBlackTreeNode *);
+	void RightRotate(RedBlackTreeNode *);
+	void TreeInsertHelp(RedBlackTreeNode *);
+	void TreePrintHelper(RedBlackTreeNode *) const;
+	void FixUpMaxHigh(RedBlackTreeNode *);
+	void DeleteFixUp(RedBlackTreeNode *);
+	size_t numElements;
+};