--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/enigma/enigma_types.h	Thu Jun 21 21:05:26 2012 -0500
@@ -0,0 +1,33 @@
+#ifndef CPP_ENIGMA_ENIGMA_TYPES_H
+#define CPP_ENIGMA_ENIGMA_TYPES_H
+// Copyright (C) 2012 by Brian Neal.
+// This file is part of Cpp-Enigma, the Enigma Machine simulation.
+// Cpp-Enigma is released under the MIT License (see License.txt).
+//
+// enigma_types.h - This file contains common types used throughout Cpp-Enigma.
+
+#include <exception>
+#include <string>
+
+namespace enigma
+{
+   class enigma_error : public std::exception
+   {
+   public:
+      explicit enigma_error(const std::string& what_arg)
+       : what_arg(what_arg)
+      {}
+
+      virtual ~enigma_error() throw() {}
+
+      virtual const char* what() const throw()
+      {
+         return what_arg.c_str();
+      }
+
+   private:
+      std::string what_arg;
+   };
+}
+
+#endif