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diff --git a/src/smt/smt_mode.h b/src/smt/smt_mode.h
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+/*********************                                                        */
+/*! \file smt_mode.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Enumeration type for the mode of an SmtEngine.
+ **/
+
+#include "cvc4_public.h"
+
+#ifndef CVC4__SMT__SMT_MODE_H
+#define CVC4__SMT__SMT_MODE_H
+
+#include <iosfwd>
+
+namespace CVC4 {
+
+/**
+ * The mode of the solver, which is an extension of Figure 4.1 on
+ * page 52 of the SMT-LIB version 2.6 standard
+ * http://smtlib.cs.uiowa.edu/papers/smt-lib-reference-v2.6-r2017-07-18.pdf
+ */
+enum class SmtMode
+{
+  // the initial state of the solver
+  START,
+  // normal state of the solver, after assert/push/pop/declare/define
+  ASSERT,
+  // immediately after a check-sat returning "sat"
+  SAT,
+  // immediately after a check-sat returning "unknown"
+  SAT_UNKNOWN,
+  // immediately after a check-sat returning "unsat"
+  UNSAT,
+  // immediately after a successful call to get-abduct
+  ABDUCT,
+  // immediately after a successful call to get-interpol
+  INTERPOL
+};
+/**
+ * Writes a SmtMode to a stream.
+ *
+ * @param out The stream to write to
+ * @param m The mode to write to the stream
+ * @return The stream
+ */
+std::ostream& operator<<(std::ostream& out, SmtMode m);
+
+}  // namespace CVC4
+
+#endif