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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_GET_SYSTEM_HPP | |
12 | #define BOOST_UNITS_GET_SYSTEM_HPP | |
13 | ||
14 | /// \file | |
15 | /// \brief Get the system of a unit, absolute unit or quantity. | |
16 | ||
17 | #include <boost/units/units_fwd.hpp> | |
18 | ||
19 | namespace boost { | |
20 | ||
21 | namespace units { | |
22 | ||
23 | template<class T> | |
24 | struct get_system {}; | |
25 | ||
26 | /// Get the system of a unit. | |
27 | template<class Dim,class System> | |
28 | struct get_system< unit<Dim,System> > | |
29 | { | |
30 | typedef System type; | |
31 | }; | |
32 | ||
33 | /// Get the system of an absolute unit. | |
34 | template<class Unit> | |
35 | struct get_system< absolute<Unit> > | |
36 | { | |
37 | typedef typename get_system<Unit>::type type; | |
38 | }; | |
39 | ||
40 | /// Get the system of a quantity. | |
41 | template<class Unit,class Y> | |
42 | struct get_system< quantity<Unit,Y> > | |
43 | { | |
44 | typedef typename get_system<Unit>::type type; | |
45 | }; | |
46 | ||
47 | } // namespace units | |
48 | ||
49 | } // namespace boost | |
50 | ||
51 | #endif // BOOST_UNITS_GET_SYSTEM_HPP |