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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 |