]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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_SEQ_POP_BACK_HPP) | |
8 | #define BOOST_VMD_SEQ_POP_BACK_HPP | |
9 | ||
10 | #include <boost/vmd/detail/setup.hpp> | |
11 | ||
12 | #if BOOST_PP_VARIADICS | |
13 | ||
14 | #include <boost/preprocessor/comparison/equal.hpp> | |
15 | #include <boost/preprocessor/control/iif.hpp> | |
16 | #include <boost/preprocessor/seq/pop_back.hpp> | |
17 | #include <boost/preprocessor/seq/size.hpp> | |
18 | #include <boost/vmd/empty.hpp> | |
19 | ||
20 | /* | |
21 | ||
22 | The succeeding comments in this file are in doxygen format. | |
23 | ||
24 | */ | |
25 | ||
26 | /** \file | |
27 | */ | |
28 | ||
29 | /** \def BOOST_VMD_SEQ_POP_BACK(seq) | |
30 | ||
31 | \brief pops an element from the end of a seq. | |
32 | ||
33 | seq = seq to pop an element from. | |
34 | ||
35 | If the seq is an empty seq the result is undefined. | |
36 | If the seq is a single element the result is an empty seq. | |
37 | Otherwise the result is a seq after removing the last element. | |
38 | */ | |
39 | ||
40 | #define BOOST_VMD_SEQ_POP_BACK(seq) \ | |
41 | BOOST_PP_IIF \ | |
42 | ( \ | |
43 | BOOST_PP_EQUAL(BOOST_PP_SEQ_SIZE(seq),1), \ | |
44 | BOOST_VMD_EMPTY, \ | |
45 | BOOST_PP_SEQ_POP_BACK \ | |
46 | ) \ | |
47 | (seq) \ | |
48 | /**/ | |
49 | ||
50 | #endif /* BOOST_PP_VARIADICS */ | |
51 | #endif /* BOOST_VMD_SEQ_POP_BACK_HPP */ |