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1 | # /* ************************************************************************** |
2 | # * * | |
3 | # * (C) Copyright Edward Diener 2014. | |
4 | # * Distributed under the Boost Software License, Version 1.0. (See | |
5 | # * accompanying file LICENSE_1_0.txt or copy at | |
6 | # * http://www.boost.org/LICENSE_1_0.txt) | |
7 | # * * | |
8 | # ************************************************************************** */ | |
9 | # | |
10 | # /* See http://www.boost.org for most recent version. */ | |
11 | # | |
12 | #ifndef BOOST_PREPROCESSOR_DETAIL_IS_EMPTY_HPP | |
13 | #define BOOST_PREPROCESSOR_DETAIL_IS_EMPTY_HPP | |
14 | ||
15 | #include <boost/preprocessor/punctuation/is_begin_parens.hpp> | |
16 | ||
17 | #if BOOST_PP_VARIADICS_MSVC | |
18 | ||
19 | # pragma warning(once:4002) | |
20 | ||
21 | #define BOOST_PP_DETAIL_IS_EMPTY_IIF_0(t, b) b | |
22 | #define BOOST_PP_DETAIL_IS_EMPTY_IIF_1(t, b) t | |
23 | ||
24 | #else | |
25 | ||
26 | #define BOOST_PP_DETAIL_IS_EMPTY_IIF_0(t, ...) __VA_ARGS__ | |
27 | #define BOOST_PP_DETAIL_IS_EMPTY_IIF_1(t, ...) t | |
28 | ||
29 | #endif | |
30 | ||
31 | #if BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 | |
32 | ||
33 | #define BOOST_PP_DETAIL_IS_EMPTY_PROCESS(param) \ | |
34 | BOOST_PP_IS_BEGIN_PARENS \ | |
35 | ( \ | |
36 | BOOST_PP_DETAIL_IS_EMPTY_NON_FUNCTION_C param () \ | |
37 | ) \ | |
38 | /**/ | |
39 | ||
40 | #else | |
41 | ||
42 | #define BOOST_PP_DETAIL_IS_EMPTY_PROCESS(...) \ | |
43 | BOOST_PP_IS_BEGIN_PARENS \ | |
44 | ( \ | |
45 | BOOST_PP_DETAIL_IS_EMPTY_NON_FUNCTION_C __VA_ARGS__ () \ | |
46 | ) \ | |
47 | /**/ | |
48 | ||
49 | #endif | |
50 | ||
51 | #define BOOST_PP_DETAIL_IS_EMPTY_PRIMITIVE_CAT(a, b) a ## b | |
52 | #define BOOST_PP_DETAIL_IS_EMPTY_IIF(bit) BOOST_PP_DETAIL_IS_EMPTY_PRIMITIVE_CAT(BOOST_PP_DETAIL_IS_EMPTY_IIF_,bit) | |
53 | #define BOOST_PP_DETAIL_IS_EMPTY_NON_FUNCTION_C(...) () | |
54 | ||
55 | #endif /* BOOST_PREPROCESSOR_DETAIL_IS_EMPTY_HPP */ |