1 # /* **************************************************************************
3 # * (C) Copyright Edward Diener 2019. *
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) *
8 # ************************************************************************** */
10 # /* See http://www.boost.org for most recent version. */
12 # ifndef BOOST_PREPROCESSOR_VARIADIC_DETAIL_HAS_OPT_HPP
13 # define BOOST_PREPROCESSOR_VARIADIC_DETAIL_HAS_OPT_HPP
15 # include <boost/preprocessor/config/config.hpp>
17 # if BOOST_PP_VARIADICS && defined(__cplusplus) && __cplusplus > 201703L
19 # if BOOST_PP_VARIADICS_MSVC
20 # include <boost/preprocessor/cat.hpp>
23 # define BOOST_PP_VARIADIC_HAS_OPT_FUNCTION(...) \
24 __VA_OPT__(,) , 1, 0 \
27 # if BOOST_PP_VARIADICS_MSVC
28 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM0(e0, ...) BOOST_PP_CAT(BOOST_PP_VARIADIC_HAS_OPT_ELEM_0(e0,__VA_ARGS__),)
29 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM2(e0, ...) BOOST_PP_CAT(BOOST_PP_VARIADIC_HAS_OPT_ELEM_2(e0,__VA_ARGS__),)
31 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM0(e0, ...) BOOST_PP_VARIADIC_HAS_OPT_ELEM_0(e0,__VA_ARGS__)
32 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM2(e0, ...) BOOST_PP_VARIADIC_HAS_OPT_ELEM_2(e0,__VA_ARGS__)
34 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM_0(e0, ...) e0
35 # define BOOST_PP_VARIADIC_HAS_OPT_ELEM_2(e0, e1, e2, ...) e2