1# /* **************************************************************************
2# * *
3# * (C) Copyright Edward Diener 2015.
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_SEQ_DETAIL_IS_EMPTY_HPP
13# define BOOST_PREPROCESSOR_SEQ_DETAIL_IS_EMPTY_HPP
14#
15# include <boost/preprocessor/config/config.hpp>
16# include <boost/preprocessor/arithmetic/dec.hpp>
17# include <boost/preprocessor/logical/bool.hpp>
18# include <boost/preprocessor/logical/compl.hpp>
19# include <boost/preprocessor/seq/size.hpp>
20#
21/* An empty seq is one that is just BOOST_PP_SEQ_NIL */
22#
23# define BOOST_PP_SEQ_DETAIL_IS_EMPTY(seq) \
24 BOOST_PP_COMPL \
25 ( \
26 BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY(seq) \
27 ) \
28/**/
29#
30# define BOOST_PP_SEQ_DETAIL_IS_EMPTY_SIZE(size) \
31 BOOST_PP_COMPL \
32 ( \
33 BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size) \
34 ) \
35/**/
36#
37# define BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY(seq) \
38 BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq)) \
39/**/
40#
41# define BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size) \
42 BOOST_PP_BOOL(size) \
43/**/
44#
45# define BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq) \
46 BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq (nil))) \
47/**/
48#
49# endif
50

source code of include/boost/preprocessor/seq/detail/is_empty.hpp