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- # /* **************************************************************************
- # * *
- # * (C) Copyright Edward Diener 2019.
- # * Distributed under the Boost Software License, Version 1.0. (See
- # * accompanying file LICENSE_1_0.txt or copy at
- # * http://www.boost.org/LICENSE_1_0.txt)
- # * *
- # ************************************************************************** */
- #
- # /* See http://www.boost.org for most recent version. */
- #
- # ifndef BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP
- # define BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP
- # include <boost/preprocessor/variadic/has_opt.hpp>
- # if BOOST_PP_VARIADIC_HAS_OPT()
- # include <boost/preprocessor/control/iif.hpp>
- # include <boost/preprocessor/facilities/check_empty.hpp>
- # include <boost/preprocessor/tuple/rem.hpp>
- # define BOOST_PP_VA_OPT_IMPL(atuple) \
- BOOST_PP_TUPLE_REM() atuple \
- /**/
- # define BOOST_PP_VA_OPT(rdata,rempty,...) \
- BOOST_PP_VA_OPT_IMPL \
- ( \
- BOOST_PP_IIF \
- ( \
- BOOST_PP_CHECK_EMPTY(__VA_ARGS__), \
- rempty, \
- rdata \
- ) \
- ) \
- /**/
- # endif /* BOOST_PP_VARIADIC_HAS_OPT() */
- # endif /* BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP */
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