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+/*********************                                                        */
+/*! \file shared_term_manager.h
+ ** \verbatim
+ ** Original author: barrett
+ ** Major contributors: 
+ ** Minor contributors (to current version): 
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Manager for shared terms
+ **
+ ** Manager for shared terms.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__SHARED_TERM_MANAGER_H
+#define __CVC4__SHARED_TERM_MANAGER_H
+
+#include "expr/node.h"
+#include "theory/shared_data.h"
+
+namespace CVC4 {
+
+namespace context {
+  class Context;
+}
+
+namespace theory {
+  class Theory;
+}
+
+/**
+ * Manages shared terms
+ */
+class SharedTermManager {
+
+  TheoryEngine* d_engine;
+
+  context::Context* d_context;
+
+  std::vector<theory::Theory*> d_theories;
+
+  SharedData* find(SharedData* pData);
+
+public:
+  SharedTermManager(TheoryEngine* engine, context::Context* context);
+
+  void registerTheory(theory::Theory* th);
+
+  void addTerm(TNode n, theory::Theory* parent,
+               theory::Theory* child);
+
+  void addEq(theory::Theory* thReason, TNode eq);
+
+  Node explain(TNode eq);
+
+};/* class SharedTermManager */
+
+/**
+ * Cleanup function for SharedData. This will be called whenever
+ * a SharedAttr is being destructed.
+ */
+struct SharedDataCleanupStrategy {
+  static void cleanup(SharedData* sd) {
+    sd->deleteSelf();
+  }
+};/* struct SharedDataCleanupStrategy */
+
+/** Unique name to use for constructing ECAttr. */
+struct SharedAttrTag {};
+
+/**
+ * SharedAttr is the attribute that maps a node to its SharedData.
+ */
+typedef expr::Attribute<SharedAttrTag, SharedData*,
+                        SharedDataCleanupStrategy> SharedAttr;
+
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__SHARED_TERM_MANAGER_H */