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1 | |
2 | // (C) Copyright Edward Diener 2011-2015 | |
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_IS_UNARY_HPP) | |
8 | #define BOOST_VMD_IS_UNARY_HPP | |
9 | ||
10 | #include <boost/vmd/detail/setup.hpp> | |
11 | ||
12 | #if BOOST_PP_VARIADICS | |
13 | ||
14 | #include <boost/vmd/detail/sequence_arity.hpp> | |
15 | ||
16 | /* | |
17 | ||
18 | The succeeding comments in this file are in doxygen format. | |
19 | ||
20 | */ | |
21 | ||
22 | /** \file | |
23 | */ | |
24 | ||
25 | /** \def BOOST_VMD_IS_UNARY(sequence) | |
26 | ||
27 | \brief Determines if the sequence has only a single element, referred to as a single-element sequence. | |
28 | ||
29 | sequence = a VMD sequence | |
30 | ||
31 | returns = 1 if the sequence is a single-element sequence, else returns 0. | |
32 | ||
33 | If the size of a sequence is known it is faster comparing that size to be equal | |
34 | to one to find out if the sequence is single-element. But if the size of the | |
35 | sequence is not known it is faster calling this macro than getting the size and | |
36 | doing the previously mentioned comparison in order to determine if the sequence | |
37 | is single-element or not. | |
38 | ||
39 | */ | |
40 | ||
41 | #define BOOST_VMD_IS_UNARY(sequence) \ | |
42 | BOOST_VMD_DETAIL_IS_UNARY(sequence) \ | |
43 | /**/ | |
44 | ||
45 | /** \def BOOST_VMD_IS_UNARY_D(d,sequence) | |
46 | ||
47 | \brief Determines if the sequence has only a single element, referred to as a single-element sequence. Re-entrant version. | |
48 | ||
49 | d = The next available BOOST_PP_WHILE iteration. | |
50 | sequence = a sequence | |
51 | ||
52 | returns = 1 if the sequence is a single-element sequence, else returns 0. | |
53 | ||
54 | If the size of a sequence is known it is faster comparing that size to be equal | |
55 | to one to find out if the sequence is single-element. But if the size of the | |
56 | sequence is not known it is faster calling this macro than getting the size and | |
57 | doing the previously mentioned comparison in order to determine if the sequence | |
58 | is single-element or not. | |
59 | ||
60 | */ | |
61 | ||
62 | #define BOOST_VMD_IS_UNARY_D(d,sequence) \ | |
63 | BOOST_VMD_DETAIL_IS_UNARY_D(d,sequence) \ | |
64 | /**/ | |
65 | ||
66 | #endif /* BOOST_PP_VARIADICS */ | |
67 | #endif /* BOOST_VMD_IS_UNARY_HPP */ |