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- // Copyright (C) 2009-2012 Lorenzo Caminiti
- // Distributed under the Boost Software License, Version 1.0
- // (see accompanying file LICENSE_1_0.txt or a copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- // Home at http://www.boost.org/libs/local_function
- #ifndef BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_HPP_
- #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_HPP_
- #include <boost/preprocessor/tuple/elem.hpp>
- // PRIVATE //
- // Param 2-tuple `([auto | register] type name, default_value)`.
- #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DECL_ 0
- #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DEFAULT_ 1
- #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_ 2
- // PUBLIC //
- // Expand: `[auto | register] type_ name_` (parameter declaration).
- #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DECL(param_traits) \
- BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_, \
- BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DECL_, param_traits)
- // Expand: `default ... EMPTY()` if default value, `EMPTY()` otherwise.
- // Leading default is kept because default value might not be alphanumeric
- // (e.g., -123) so failing `CAT` for `IS_EMPTY` check.
- #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DEFAULT(param_traits) \
- BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_, \
- BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DEFAULT_, \
- param_traits)(/* expand EMPTY */)
- #endif // #include guard
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