// 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 |