diff --git a/ndnboost/numeric/conversion/sign_mixture_enum.hpp b/ndnboost/numeric/conversion/sign_mixture_enum.hpp
new file mode 100644
index 0000000..cfb7151
--- /dev/null
+++ b/ndnboost/numeric/conversion/sign_mixture_enum.hpp
@@ -0,0 +1,29 @@
+//  (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
+//  Use, modification, and distribution is subject to the Boost Software
+//  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+
+//  See library home page at http://www.boost.org/libs/numeric/conversion
+//
+// Contact the author at: fernando_cacciola@hotmail.com
+// 
+#ifndef BOOST_NUMERIC_CONVERSION_SIGN_MIXTURE_ENUM_FLC_12NOV2002_HPP
+#define BOOST_NUMERIC_CONVERSION_SIGN_MIXTURE_ENUM_FLC_12NOV2002_HPP
+
+namespace ndnboost { namespace numeric
+{
+  enum sign_mixture_enum
+  {
+     unsigned_to_unsigned
+    ,signed_to_signed
+    ,signed_to_unsigned
+    ,unsigned_to_signed
+  } ;
+
+} } // namespace ndnboost::numeric
+
+#endif
+//
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+