variadic/detail/has_opt.hpp

0001 # /* **************************************************************************
0002 #  *                                                                          *
0003 #  *     (C) Copyright Edward Diener 2019.                                    *
0004 #  *     Distributed under the Boost Software License, Version 1.0. (See      *
0005 #  *     accompanying file LICENSE_1_0.txt or copy at                         *
0006 #  *     http://www.boost.org/LICENSE_1_0.txt)                                *
0007 #  *                                                                          *
0008 #  ************************************************************************** */
0009 0010 ">#
0011 # /* See http://www.boost.org for most recent version. */
0012 0013 ">#
0014 # ifndef BOOST_PREPROCESSOR_VARIADIC_DETAIL_HAS_OPT_HPP
0015 # define BOOST_PREPROCESSOR_VARIADIC_DETAIL_HAS_OPT_HPP
0016 0017 ">#
0018 # include <boost/preprocessor/config/config.hpp>
0019 0020 ">#
0021 # if defined(__cplusplus) && __cplusplus > 201703L
0022 0023 ">#
0024 # if BOOST_PP_VARIADICS_MSVC
0025 # include <boost/preprocessor/cat.hpp>
0026 # endif
0027 0028 ">#
0029 # define BOOST_PP_VARIADIC_HAS_OPT_FUNCTION(...) \
0030     __VA_OPT__(,) , 1, 0 \
0031 /**/
0032 0033 ">#
0034 # if BOOST_PP_VARIADICS_MSVC
0035 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM0(e0, ...) BOOST_PP_CAT(BOOST_PP_VARIADIC_HAS_OPT_ELEM_0(e0,__VA_ARGS__),)
0036 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM2(e0, ...) BOOST_PP_CAT(BOOST_PP_VARIADIC_HAS_OPT_ELEM_2(e0,__VA_ARGS__),)
0037 # else
0038 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM0(e0, ...) BOOST_PP_VARIADIC_HAS_OPT_ELEM_0(e0,__VA_ARGS__)
0039 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM2(e0, ...) BOOST_PP_VARIADIC_HAS_OPT_ELEM_2(e0,__VA_ARGS__)
0040 # endif
0041 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM_0(e0, ...) e0
0042 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM_2(e0, e1, e2, ...) e2
0043 0044 ">#
0045 # endif
0046 0047 ">#
0048 # endif