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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) 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_DIMENSIONLESS_TYPE_HPP
+#define BOOST_UNITS_DIMENSIONLESS_TYPE_HPP
+
+///
+/// \file
+/// \brief Dimension lists in which all exponents resolve to zero reduce to @c dimensionless_type.
+///
+
+#include <boost/mpl/long.hpp>
+#include <boost/mpl/deref.hpp>
+#include <boost/mpl/arithmetic.hpp>
+
+#include <boost/units/config.hpp>
+
+namespace boost {
+
+namespace units {
+
+namespace detail {
+
+struct dimension_list_tag;
+
+}
+
+/// Dimension lists in which all exponents resolve to zero reduce to @c dimensionless_type.
+struct dimensionless_type
+{
+    typedef dimensionless_type          type;
+    typedef detail::dimension_list_tag  tag;
+    typedef mpl::long_<0>               size;
+};
+
+} // namespace units
+
+} // namespace boost
+
+#if BOOST_UNITS_HAS_BOOST_TYPEOF
+
+#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
+
+BOOST_TYPEOF_REGISTER_TYPE(boost::units::dimensionless_type)
+
+#endif
+
+#endif // BOOST_UNITS_DIMENSIONLESS_TYPE_HPP