1 | # /* ************************************************************************** |
2 | # * * |
3 | # * (C) Copyright Edward Diener 2014,2019. |
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_FACILITIES_IS_EMPTY_VARIADIC_HPP |
13 | # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP |
14 | # |
15 | # include <boost/preprocessor/config/config.hpp> |
16 | # |
17 | # if BOOST_PP_VARIADICS |
18 | # |
19 | # include <boost/preprocessor/punctuation/is_begin_parens.hpp> |
20 | # include <boost/preprocessor/facilities/detail/is_empty.hpp> |
21 | # |
22 | #if BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 |
23 | # |
24 | #define BOOST_PP_IS_EMPTY(param) \ |
25 | BOOST_PP_DETAIL_IS_EMPTY_IIF \ |
26 | ( \ |
27 | BOOST_PP_IS_BEGIN_PARENS \ |
28 | ( \ |
29 | param \ |
30 | ) \ |
31 | ) \ |
32 | ( \ |
33 | BOOST_PP_IS_EMPTY_ZERO, \ |
34 | BOOST_PP_DETAIL_IS_EMPTY_PROCESS \ |
35 | ) \ |
36 | (param) \ |
37 | /**/ |
38 | #define BOOST_PP_IS_EMPTY_ZERO(param) 0 |
39 | # else |
40 | # if defined(__cplusplus) && __cplusplus > 201703L |
41 | # include <boost/preprocessor/variadic/has_opt.hpp> |
42 | #define BOOST_PP_IS_EMPTY(...) \ |
43 | BOOST_PP_DETAIL_IS_EMPTY_IIF \ |
44 | ( \ |
45 | BOOST_PP_VARIADIC_HAS_OPT() \ |
46 | ) \ |
47 | ( \ |
48 | BOOST_PP_IS_EMPTY_OPT, \ |
49 | BOOST_PP_IS_EMPTY_NO_OPT \ |
50 | ) \ |
51 | (__VA_ARGS__) \ |
52 | /**/ |
53 | #define BOOST_PP_IS_EMPTY_FUNCTION2(...) \ |
54 | __VA_OPT__(0,) 1 \ |
55 | /**/ |
56 | #define BOOST_PP_IS_EMPTY_FUNCTION(...) \ |
57 | BOOST_PP_IS_EMPTY_FUNCTION2(__VA_ARGS__) \ |
58 | /**/ |
59 | #define BOOST_PP_IS_EMPTY_OPT(...) \ |
60 | BOOST_PP_VARIADIC_HAS_OPT_ELEM0(BOOST_PP_IS_EMPTY_FUNCTION(__VA_ARGS__),) \ |
61 | /**/ |
62 | # else |
63 | #define BOOST_PP_IS_EMPTY(...) \ |
64 | BOOST_PP_IS_EMPTY_NO_OPT(__VA_ARGS__) \ |
65 | /**/ |
66 | # endif /* defined(__cplusplus) && __cplusplus > 201703L */ |
67 | #define BOOST_PP_IS_EMPTY_NO_OPT(...) \ |
68 | BOOST_PP_DETAIL_IS_EMPTY_IIF \ |
69 | ( \ |
70 | BOOST_PP_IS_BEGIN_PARENS \ |
71 | ( \ |
72 | __VA_ARGS__ \ |
73 | ) \ |
74 | ) \ |
75 | ( \ |
76 | BOOST_PP_IS_EMPTY_ZERO, \ |
77 | BOOST_PP_DETAIL_IS_EMPTY_PROCESS \ |
78 | ) \ |
79 | (__VA_ARGS__) \ |
80 | /**/ |
81 | #define BOOST_PP_IS_EMPTY_ZERO(...) 0 |
82 | # endif /* BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 */ |
83 | # endif /* BOOST_PP_VARIADICS */ |
84 | # endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP */ |
85 | |