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