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Diffstat (limited to 'boost/preprocessor/seq/detail/is_empty.hpp')
| -rw-r--r-- | boost/preprocessor/seq/detail/is_empty.hpp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/boost/preprocessor/seq/detail/is_empty.hpp b/boost/preprocessor/seq/detail/is_empty.hpp new file mode 100644 index 0000000000..1a80a2f611 --- /dev/null +++ b/boost/preprocessor/seq/detail/is_empty.hpp @@ -0,0 +1,49 @@ +# /* ************************************************************************** +# * * +# * (C) Copyright Edward Diener 2015. +# * Distributed under the Boost Software License, Version 1.0. (See +# * accompanying file LICENSE_1_0.txt or copy at +# * http://www.boost.org/LICENSE_1_0.txt) +# * * +# ************************************************************************** */ +# +# /* See http://www.boost.org for most recent version. */ +# +# ifndef BOOST_PREPROCESSOR_SEQ_DETAIL_IS_EMPTY_HPP +# define BOOST_PREPROCESSOR_SEQ_DETAIL_IS_EMPTY_HPP +# +# include <boost/preprocessor/config/config.hpp> +# include <boost/preprocessor/arithmetic/dec.hpp> +# include <boost/preprocessor/logical/bool.hpp> +# include <boost/preprocessor/logical/compl.hpp> +# include <boost/preprocessor/seq/size.hpp> +# +/* An empty seq is one that is just BOOST_PP_SEQ_NIL */ +# +# define BOOST_PP_SEQ_DETAIL_IS_EMPTY(seq) \ + BOOST_PP_COMPL \ + ( \ + BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY(seq) \ + ) \ +/**/ +# +# define BOOST_PP_SEQ_DETAIL_IS_EMPTY_SIZE(size) \ + BOOST_PP_COMPL \ + ( \ + BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size) \ + ) \ +/**/ +# +# define BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY(seq) \ + BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq)) \ +/**/ +# +# define BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size) \ + BOOST_PP_BOOL(size) \ +/**/ +# +# define BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq) \ + BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq (nil))) \ +/**/ +# +# endif |