Imported existing code

libraries/include/boost/units/is_dimensionless.hpp

@@ -0,0 +1,42 @@
+// 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_DIMENSIONLESS_HPP
+#define BOOST_UNITS_IS_DIMENSIONLESS_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/units/units_fwd.hpp>
+
+namespace boost {
+
+namespace units {
+
+template<class T>
+struct is_dimensionless :
+    public mpl::false_
+{ };
+
+/// check if a unit is dimensionless
+template<class System>
+struct is_dimensionless< unit<dimensionless_type,System> > :
+    public mpl::true_
+{ };
+
+/// check if a quantity is dimensionless
+template<class Unit,class Y>
+struct is_dimensionless< quantity<Unit,Y> > :
+    public is_dimensionless<Unit>
+{ };
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_IS_DIMENSIONLESS_HPP