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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_DETAIL_PREVENT_REDEFINITION_HPP | |
12 | #define BOOST_UNITS_DETAIL_PREVENT_REDEFINITION_HPP | |
13 | ||
14 | #include <boost/mpl/long.hpp> | |
15 | ||
16 | namespace boost { | |
17 | ||
18 | namespace units { | |
19 | ||
20 | namespace detail { | |
21 | ||
22 | struct no { no() {} char dummy; }; | |
23 | struct yes { no dummy[2]; }; | |
24 | ||
25 | template<bool> struct ordinal_has_already_been_defined; | |
26 | ||
27 | template<> | |
28 | struct ordinal_has_already_been_defined<true> { }; | |
29 | ||
30 | template<> | |
31 | struct ordinal_has_already_been_defined<false> { typedef void type; }; | |
32 | ||
33 | } | |
34 | ||
35 | /// This must be in namespace boost::units so that ADL | |
36 | /// will work. we need a mangled name because it must | |
37 | /// be found by ADL | |
38 | /// INTERNAL ONLY | |
39 | template<class T> | |
40 | detail::no | |
41 | boost_units_is_registered(const T&) | |
42 | { detail::no result; return(result); } | |
43 | ||
44 | /// INTERNAL ONLY | |
45 | template<class T> | |
46 | detail::no | |
47 | boost_units_unit_is_registered(const T&) | |
48 | { detail::no result; return(result); } | |
49 | ||
50 | } // namespace units | |
51 | ||
52 | } // namespace boost | |
53 | ||
54 | #endif // BOOST_UNITS_PREVENT_ORDINAL_REDEFINITION_IMPL_HPP |