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