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diff --git a/src/expr/node_manager.h b/src/expr/node_manager.h
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+++ b/src/expr/node_manager.h
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+/*********************                                           -*- C++ -*-  */
+/** expr_manager.h
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009 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.
+ **
+ **/
+
+#ifndef __CVC4__EXPR_MANAGER_H
+#define __CVC4__EXPR_MANAGER_H
+
+#include <vector>
+#include <map>
+
+#include "node.h"
+#include "kind.h"
+
+namespace CVC4 {
+
+namespace expr {
+  class ExprBuilder;
+}/* CVC4::expr namespace */
+
+class CVC4_PUBLIC NodeManager {
+  static __thread NodeManager* s_current;
+
+  friend class CVC4::NodeBuilder;
+
+  typedef std::map<uint64_t, std::vector<Node> > hash_t;
+  hash_t d_hash;
+
+  Node lookup(uint64_t hash, const Node& e);
+
+public:
+  static NodeManager* currentEM() { return s_current; }
+
+  // general expression-builders
+  Node mkExpr(Kind kind);
+  Node mkExpr(Kind kind, const Node& child1);
+  Node mkExpr(Kind kind, const Node& child1, const Node& child2);
+  Node mkExpr(Kind kind, const Node& child1, const Node& child2, const Node& child3);
+  Node mkExpr(Kind kind, const Node& child1, const Node& child2, const Node& child3, const Node& child4);
+  Node mkExpr(Kind kind, const Node& child1, const Node& child2, const Node& child3, const Node& child4, const Node& child5);
+  // N-ary version
+  Node mkExpr(Kind kind, std::vector<Node> children);
+
+  // variables are special, because duplicates are permitted
+  Node mkVar();
+
+  // TODO: these use the current EM (but must be renamed)
+  /*
+  static Node mkExpr(Kind kind)
+  { currentEM()->mkExpr(kind); }
+  static Node mkExpr(Kind kind, Node child1);
+  { currentEM()->mkExpr(kind, child1); }
+  static Node mkExpr(Kind kind, Node child1, Node child2);
+  { currentEM()->mkExpr(kind, child1, child2); }
+  static Node mkExpr(Kind kind, Node child1, Node child2, Node child3);
+  { currentEM()->mkExpr(kind, child1, child2, child3); }
+  static Node mkExpr(Kind kind, Node child1, Node child2, Node child3, Node child4);
+  { currentEM()->mkExpr(kind, child1, child2, child3, child4); }
+  static Node mkExpr(Kind kind, Node child1, Node child2, Node child3, Node child4, Node child5);
+  { currentEM()->mkExpr(kind, child1, child2, child3, child4, child5); }
+  */
+
+  // do we want a varargs one?  perhaps not..
+};
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__EXPR_MANAGER_H */