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+// 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
+
+///
+/// \file
+/// \brief Check if a unit or quantity is dimensionless.
+///
+
+#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