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) 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_IS_DIMENSION_LIST_HPP |
12 | #define BOOST_UNITS_IS_DIMENSION_LIST_HPP |
13 | |
14 | /// |
15 | /// \file |
16 | /// \brief Check that a type is a valid dimension list. |
17 | /// |
18 | |
19 | #include <boost/mpl/bool.hpp> |
20 | |
21 | #include <boost/units/units_fwd.hpp> |
22 | |
23 | namespace boost { |
24 | |
25 | namespace units { |
26 | |
27 | /// Check that a type is a valid dimension list. |
28 | template<typename Seq> |
29 | struct is_dimension_list : |
30 | public mpl::false_ |
31 | { }; |
32 | |
33 | template<typename Item, typename Next> |
34 | struct is_dimension_list<list<Item, Next> > : |
35 | public mpl::true_ |
36 | { }; |
37 | |
38 | template<> |
39 | struct is_dimension_list<dimensionless_type> : |
40 | public mpl::true_ |
41 | { }; |
42 | |
43 | } // namespace units |
44 | |
45 | } // namespace boost |
46 | |
47 | #endif // BOOST_UNITS_IS_DIMENSION_LIST_HPP |
48 | |