preprocessor/variadic/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 # /* See http://www.boost.org for most recent version. */
0011 #
0012 # ifndef BOOST_PREPROCESSOR_VARIADIC_HAS_OPT_HPP
0013 # define BOOST_PREPROCESSOR_VARIADIC_HAS_OPT_HPP
0014 #
0015 # include <boost/preprocessor/config/config.hpp>
0016 #
0017 # /* BOOST_PP_VARIADIC_HAS_OPT */
0018 #
0019 # if defined(__cplusplus) && __cplusplus > 201703L
0020 #  if defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 8 && __GNUC__ < 10
0021 #   define BOOST_PP_VARIADIC_HAS_OPT() 0
0022 #  else
0023 #   include <boost/preprocessor/variadic/detail/has_opt.hpp>
0024 #   define BOOST_PP_VARIADIC_HAS_OPT() \
0025   BOOST_PP_VARIADIC_HAS_OPT_ELEM2(BOOST_PP_VARIADIC_HAS_OPT_FUNCTION(?),) \
0026 /**/
0027 #  endif
0028 # else
0029 # define BOOST_PP_VARIADIC_HAS_OPT() 0
0030 # endif
0031 #
0032 # endif