Added boost header

test/external/boost/units/reduce_unit.hpp

@@ -0,0 +1,41 @@
+// Boost.Units - A C++ library for zero-overhead dimensional analysis and 
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2007-2008 Steven Watanabe
+//
+// Distributed under 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)
+
+#ifndef BOOST_UNITS_REDUCE_UNIT_HPP_INCLUDED
+#define BOOST_UNITS_REDUCE_UNIT_HPP_INCLUDED
+
+/// \file
+/// \brief Returns a unique type for every unit.
+
+namespace boost {
+namespace units {
+
+#ifdef BOOST_UNITS_DOXYGEN
+
+/// Returns a unique type for every unit.
+template<class Unit>
+struct reduce_unit {
+    typedef detail::unspecified type;
+};
+
+#else
+
+// default implementation: return Unit unchanged.
+template<class Unit>
+struct reduce_unit {
+    typedef Unit type;
+};
+
+#endif
+
+}
+}
+
+#endif