Imported existing code

libraries/include/boost/units/is_unit_of_system.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) 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_IS_UNIT_OF_SYSTEM_HPP
+#define BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/units/units_fwd.hpp>
+
+namespace boost {
+
+namespace units {
+
+/// check that a type is a unit in a specified system
+template<class T,class System>
+struct is_unit_of_system :
+    public mpl::false_
+{ };
+    
+template<class Dim,class System>
+struct is_unit_of_system< unit<Dim,System>,System > :
+    public mpl::true_
+{ };
+    
+template<class Dim,class System>
+struct is_unit_of_system< absolute<unit<Dim,System> >,System > :
+    public mpl::true_
+{ };
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP