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diff --git a/Source/cmGraphAdjacencyList.h b/Source/cmGraphAdjacencyList.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmGraphAdjacencyList_h
+#define cmGraphAdjacencyList_h
+
+#include "cmStandardIncludes.h"
+
+/**
+ * Graph edge representation.  Most use cases just need the
+ * destination vertex, so we support conversion to/from an int.  We
+ * also store boolean to indicate whether an edge is "strong".
+ */
+class cmGraphEdge
+{
+public:
+  cmGraphEdge(): Dest(0), Strong(true) {}
+  cmGraphEdge(int n): Dest(n), Strong(true) {}
+  cmGraphEdge(int n, bool s): Dest(n), Strong(s) {}
+  cmGraphEdge(cmGraphEdge const& r): Dest(r.Dest), Strong(r.Strong) {}
+  operator int() const { return this->Dest; }
+
+  bool IsStrong() const { return this->Strong; }
+private:
+  int Dest;
+  bool Strong;
+};
+struct cmGraphEdgeList: public std::vector<cmGraphEdge> {};
+struct cmGraphNodeList: public std::vector<int> {};
+struct cmGraphAdjacencyList: public std::vector<cmGraphEdgeList> {};
+
+#endif