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50 lines
1.6 KiB
50 lines
1.6 KiB
3 years ago
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# /* **************************************************************************
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# * *
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# * (C) Copyright Edward Diener 2015.
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# * Distributed under the Boost Software License, Version 1.0. (See
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# * accompanying file LICENSE_1_0.txt or copy at
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# * http://www.boost.org/LICENSE_1_0.txt)
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# * *
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# ************************************************************************** */
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#
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# /* See http://www.boost.org for most recent version. */
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#
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# ifndef BOOST_PREPROCESSOR_SEQ_DETAIL_IS_EMPTY_HPP
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# define BOOST_PREPROCESSOR_SEQ_DETAIL_IS_EMPTY_HPP
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#
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# include <boost/preprocessor/config/config.hpp>
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# include <boost/preprocessor/arithmetic/dec.hpp>
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# include <boost/preprocessor/logical/bool.hpp>
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# include <boost/preprocessor/logical/compl.hpp>
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# include <boost/preprocessor/seq/size.hpp>
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#
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/* An empty seq is one that is just BOOST_PP_SEQ_NIL */
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#
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# define BOOST_PP_SEQ_DETAIL_IS_EMPTY(seq) \
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BOOST_PP_COMPL \
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( \
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BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY(seq) \
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) \
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/**/
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#
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# define BOOST_PP_SEQ_DETAIL_IS_EMPTY_SIZE(size) \
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BOOST_PP_COMPL \
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( \
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BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size) \
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) \
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/**/
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#
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# define BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY(seq) \
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BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq)) \
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/**/
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#
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# define BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size) \
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BOOST_PP_BOOL(size) \
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/**/
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#
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# define BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq) \
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BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq (nil))) \
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/**/
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#
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# endif
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