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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
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