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1 | |
2 | // (C) Copyright Edward Diener 2015 | |
3 | // Use, modification and distribution are subject to the Boost Software License, | |
4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt). | |
6 | ||
7 | #if !defined(BOOST_VMD_TUPLE_SIZE_HPP) | |
8 | #define BOOST_VMD_TUPLE_SIZE_HPP | |
9 | ||
10 | #include <boost/vmd/detail/setup.hpp> | |
11 | ||
12 | #if BOOST_PP_VARIADICS | |
13 | ||
14 | #include <boost/preprocessor/control/iif.hpp> | |
15 | #include <boost/preprocessor/tuple/size.hpp> | |
16 | #include <boost/vmd/identity.hpp> | |
17 | #include <boost/vmd/is_empty.hpp> | |
18 | ||
19 | /* | |
20 | ||
21 | The succeeding comments in this file are in doxygen format. | |
22 | ||
23 | */ | |
24 | ||
25 | /** \file | |
26 | */ | |
27 | ||
28 | /** \def BOOST_VMD_TUPLE_SIZE(tuple) | |
29 | ||
30 | \brief expands to the size of the tuple passed to it. | |
31 | ||
32 | tuple = tuple whose size is to be extracted. | |
33 | ||
34 | If the tuple is an empty tuple its size is 0. | |
35 | Otherwise the result is the number of elements in the tuple. | |
36 | */ | |
37 | ||
38 | #define BOOST_VMD_TUPLE_SIZE(tuple) \ | |
39 | BOOST_VMD_IDENTITY_RESULT \ | |
40 | ( \ | |
41 | BOOST_PP_IIF \ | |
42 | ( \ | |
43 | BOOST_VMD_IS_EMPTY(tuple), \ | |
44 | BOOST_VMD_IDENTITY(0), \ | |
45 | BOOST_PP_TUPLE_SIZE \ | |
46 | ) \ | |
47 | (tuple) \ | |
48 | ) \ | |
49 | /**/ | |
50 | ||
51 | #endif /* BOOST_PP_VARIADICS */ | |
52 | #endif /* BOOST_VMD_TUPLE_SIZE_HPP */ |