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 */
56