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