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+/*********************                                                        */
+/*! \file lemma_output_channel.h
+ ** \verbatim
+ ** Original author: Morgan Deters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2014  New York University and The University of Iowa
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Mechanism for communication about new lemmas
+ **
+ ** This file defines an interface for use by the theory and propositional
+ ** engines to communicate new lemmas to the "outside world," for example
+ ** for lemma sharing between threads.
+ **/
+
+#include "cvc4_public.h"
+
+#ifndef __CVC4__LEMMA_OUTPUT_CHANNEL_H
+#define __CVC4__LEMMA_OUTPUT_CHANNEL_H
+
+#include "base/lemma_output_channel_forward.h"
+#include "expr/expr.h"
+
+namespace CVC4 {
+
+/**
+ * This interface describes a mechanism for the propositional and theory
+ * engines to communicate with the "outside world" about new lemmas being
+ * discovered.
+ */
+class CVC4_PUBLIC LemmaOutputChannel {
+public:
+  virtual ~LemmaOutputChannel() throw() { }
+
+  /**
+   * Notifies this output channel that there's a new lemma.
+   * The lemma may or may not be in CNF.
+   */
+  virtual void notifyNewLemma(Expr lemma) = 0;
+};/* class LemmaOutputChannel */
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__LEMMA_OUTPUT_CHANNEL_H */