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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) 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_DIMENSIONLESS_HPP | |
12 | #define BOOST_UNITS_IS_DIMENSIONLESS_HPP | |
13 | ||
14 | /// | |
15 | /// \file | |
16 | /// \brief Check if a unit or quantity is dimensionless. | |
17 | /// | |
18 | ||
19 | #include <boost/mpl/bool.hpp> | |
20 | #include <boost/units/units_fwd.hpp> | |
21 | ||
22 | namespace boost { | |
23 | ||
24 | namespace units { | |
25 | ||
26 | template<class T> | |
27 | struct is_dimensionless : | |
28 | public mpl::false_ | |
29 | { }; | |
30 | ||
31 | /// Check if a unit is dimensionless. | |
32 | template<class System> | |
33 | struct is_dimensionless< unit<dimensionless_type,System> > : | |
34 | public mpl::true_ | |
35 | { }; | |
36 | ||
37 | /// Check if a quantity is dimensionless. | |
38 | template<class Unit,class Y> | |
39 | struct is_dimensionless< quantity<Unit,Y> > : | |
40 | public is_dimensionless<Unit> | |
41 | { }; | |
42 | ||
43 | } // namespace units | |
44 | ||
45 | } // namespace boost | |
46 | ||
47 | #endif // BOOST_UNITS_IS_DIMENSIONLESS_HPP |