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