--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/enigma/enigma_utils.h	Fri Jun 22 20:15:11 2012 -0500
@@ -0,0 +1,22 @@
+#ifndef CPP_ENIGMA_ENIGMA_UTILS_H
+#define CPP_ENIGMA_ENIGMA_UTILS_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_utils.h - This file contains common functions used throughout Cpp-Enigma.
+
+namespace enigma
+{
+   // This version of mod acts like Python's with respect to negative dividends.
+   inline int alpha_mod(int dividend)
+   {
+      if (dividend < 0)
+      {
+         dividend += 26;
+      }
+      return dividend % 26;
+   }
+}
+
+#endif