source: NonGTP/Boost/boost/preprocessor/facilities/is_empty.hpp @ 857

Revision 857, 2.2 KB checked in by igarcia, 19 years ago (diff)
Line 
1# /* **************************************************************************
2#  *                                                                          *
3#  *     (C) Copyright Paul Mensonides 2003.
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_HPP
13# define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP
14#
15# include <boost/preprocessor/config/config.hpp>
16# include <boost/preprocessor/cat.hpp>
17# include <boost/preprocessor/tuple/elem.hpp>
18# include <boost/preprocessor/facilities/empty.hpp>
19# include <boost/preprocessor/detail/split.hpp>
20#
21# /* BOOST_PP_IS_EMPTY */
22#
23# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
24#    define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(x BOOST_PP_IS_EMPTY_HELPER)
25#    define BOOST_PP_IS_EMPTY_I(contents) BOOST_PP_TUPLE_ELEM(2, 1, (BOOST_PP_IS_EMPTY_DEF_ ## contents()))
26#    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 1, 1 BOOST_PP_EMPTY
27#    define BOOST_PP_IS_EMPTY_HELPER() , 0
28# else
29#    if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
30#        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(BOOST_PP_IS_EMPTY_HELPER x ())
31#        define BOOST_PP_IS_EMPTY_I(test) BOOST_PP_IS_EMPTY_II(BOOST_PP_SPLIT(0, BOOST_PP_CAT(BOOST_PP_IS_EMPTY_DEF_, test)))
32#        define BOOST_PP_IS_EMPTY_II(id) id
33#    else
34#        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I((BOOST_PP_IS_EMPTY_HELPER x ()))
35#        define BOOST_PP_IS_EMPTY_I(par) BOOST_PP_IS_EMPTY_II ## par
36#        define BOOST_PP_IS_EMPTY_II(test) BOOST_PP_SPLIT(0, BOOST_PP_CAT(BOOST_PP_IS_EMPTY_DEF_, test))
37#    endif
38#    define BOOST_PP_IS_EMPTY_HELPER() 1
39#    define BOOST_PP_IS_EMPTY_DEF_1 1, BOOST_PP_NIL
40#    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 0, BOOST_PP_NIL
41# endif
42#
43# endif
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