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