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App/util/SpanningEdge.h

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+/* Copyright 2003-2006 ROBLOX Corporation, All Rights Reserved */
+
+#pragma once
+
+#include "Util/IndexedTree.h"
+
+namespace RBX {
+
+	class SpanningNode;
+	class SpanningTree;
+
+	class SpanningEdge
+	{
+		friend class SpanningTree;
+
+	private:
+		void removeFromSpanningTree();
+		void addToSpanningTree(SpanningNode* newParent);
+
+	protected:
+
+	public:
+		SpanningEdge() {}
+
+		virtual ~SpanningEdge() {}
+
+		bool isLighterThan(const SpanningEdge* other) const {
+			return other->isHeavierThan(this);
+		}
+
+		bool inSpanningTree() const;
+
+		SpanningNode* getChildSpanningNode();
+		SpanningNode* getParentSpanningNode();
+
+		const SpanningNode* getConstChildSpanningNode() const;
+		const SpanningNode* getConstParentSpanningNode() const;
+
+		//////////////////////////////////////////////////////////
+		//
+		virtual bool isHeavierThan(const SpanningEdge* other) const = 0;
+
+		virtual SpanningNode* otherNode(SpanningNode* n) = 0;
+		virtual const SpanningNode* otherConstNode(const SpanningNode* n) const = 0;
+
+		virtual SpanningNode* getNode(int i) = 0;
+		virtual const SpanningNode* getConstNode(int i) const = 0;
+
+		SpanningNode* otherNode(int i) {
+			RBXASSERT_VERY_FAST((i == 0) || (i == 1));
+			return getNode((i + 1) % 2);
+		}
+
+		//////////////////////////////////////////////////////////
+		//
+		static bool heavierEdge(const SpanningEdge* test, const SpanningEdge* other) {
+			return test->isHeavierThan(other);
+		}
+	};
+
+} // namespace
+