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diff --git a/lib/SMT/exception.h b/lib/SMT/exception.h
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+++ b/lib/SMT/exception.h
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+/*****************************************************************************/
+/*!
+ * \file exception.h
+ * 
+ * Author: Sergey Berezin
+ * 
+ * Created: Thu Feb  6 13:09:44 2003
+ *
+ * <hr>
+ *
+ * License to use, copy, modify, sell and/or distribute this software
+ * and its documentation for any purpose is hereby granted without
+ * royalty, subject to the terms and conditions defined in the \ref
+ * LICENSE file provided with this distribution.
+ * 
+ * <hr>
+ * 
+ * A generic exception.  Any thrown exception must inherit from this
+ * class and whenever possible, set the error message.
+ */
+/*****************************************************************************/
+
+#ifndef _cvc3__exception_h_
+#define _cvc3__exception_h_
+
+#include <string>
+#include <iostream>
+
+namespace CVC3 {
+
+  class Exception {
+  protected:
+    std::string d_msg;
+  public:
+    // Constructors
+    Exception(): d_msg("Unknown exception") { }
+    Exception(const std::string& msg): d_msg(msg) { }
+    Exception(const char* msg): d_msg(msg) { }
+    // Destructor
+    virtual ~Exception() { }
+    // NON-VIRTUAL METHODs for setting and printing the error message
+    void setMessage(const std::string& msg) { d_msg = msg; }
+    // Printing: feel free to redefine toString().  When inherited,
+    // it's recommended that this method print the type of exception
+    // before the actual message.
+    virtual std::string toString() const { return d_msg; }
+    // No need to overload operator<< for the inherited classes
+    friend std::ostream& operator<<(std::ostream& os, const Exception& e);
+
+  }; // end of class Exception
+
+  inline std::ostream& operator<<(std::ostream& os, const Exception& e) {
+    return os << e.toString();
+  }
+
+} // end of namespace CVC3 
+
+#endif