| 1 | // Boost.Units - A C++ library for zero-overhead dimensional analysis and |
|---|---|
| 2 | // unit/quantity manipulation and conversion |
| 3 | // |
| 4 | // Copyright (C) 2003-2008 Matthias Christian Schabel |
| 5 | // Copyright (C) 2007-2008 Steven Watanabe |
| 6 | // |
| 7 | // Distributed under the Boost Software License, Version 1.0. (See |
| 8 | // accompanying file LICENSE_1_0.txt or copy at |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
| 10 | |
| 11 | #ifndef BOOST_UNITS_DIMENSIONLESS_TYPE_HPP |
| 12 | #define BOOST_UNITS_DIMENSIONLESS_TYPE_HPP |
| 13 | |
| 14 | /// |
| 15 | /// \file |
| 16 | /// \brief Dimension lists in which all exponents resolve to zero reduce to @c dimensionless_type. |
| 17 | /// |
| 18 | |
| 19 | #include <boost/mpl/long.hpp> |
| 20 | #include <boost/mpl/deref.hpp> |
| 21 | #include <boost/mpl/arithmetic.hpp> |
| 22 | |
| 23 | #include <boost/units/config.hpp> |
| 24 | |
| 25 | namespace boost { |
| 26 | |
| 27 | namespace units { |
| 28 | |
| 29 | namespace detail { |
| 30 | |
| 31 | struct dimension_list_tag; |
| 32 | |
| 33 | } |
| 34 | |
| 35 | /// Dimension lists in which all exponents resolve to zero reduce to @c dimensionless_type. |
| 36 | struct dimensionless_type |
| 37 | { |
| 38 | typedef dimensionless_type type; |
| 39 | typedef detail::dimension_list_tag tag; |
| 40 | typedef mpl::long_<0> size; |
| 41 | }; |
| 42 | |
| 43 | } // namespace units |
| 44 | |
| 45 | } // namespace boost |
| 46 | |
| 47 | #if BOOST_UNITS_HAS_BOOST_TYPEOF |
| 48 | |
| 49 | #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP() |
| 50 | |
| 51 | BOOST_TYPEOF_REGISTER_TYPE(boost::units::dimensionless_type) |
| 52 | |
| 53 | #endif |
| 54 | |
| 55 | #endif // BOOST_UNITS_DIMENSIONLESS_TYPE_HPP |
| 56 |