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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_DECL_TRAITS_PARAMS_HPP_
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#define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_HPP_
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#include <boost/local_function/aux_/preprocessor/traits/decl_/index.hpp>
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#include <boost/local_function/aux_/preprocessor/traits/param.hpp>
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#include <boost/local_function/detail/preprocessor/keyword/default.hpp>
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#include <boost/preprocessor/tuple/elem.hpp>
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#include <boost/preprocessor/tuple/eat.hpp>
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#include <boost/preprocessor/tuple/rem.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/control/iif.hpp>
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#include <boost/preprocessor/logical/compl.hpp>
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#include <boost/preprocessor/facilities/is_empty.hpp>
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#include <boost/preprocessor/list/adt.hpp>
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#include <boost/preprocessor/list/fold_left.hpp>
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// PRIVATE //
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#define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_OP_(s, \
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default_count, param_traits) \
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BOOST_PP_IIF(BOOST_PP_IS_EMPTY( \
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BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DEFAULT(param_traits)), \
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BOOST_PP_TUPLE_REM(1) \
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, \
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BOOST_PP_INC \
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)(default_count)
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// Precondition: params is a pp-list which is not nil.
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#define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_COUNT_(params) \
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BOOST_PP_LIST_FOLD_LEFT( \
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BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_OP_, \
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0 /* start with defaults_count to 0 */, params)
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// PUBLIC //
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// Expand: pp-list of param-traits (no bound variables).
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#define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
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BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_INDEX_MAX, \
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BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_INDEX_PARAMS, decl_traits)
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// Expand: number of parameters with default values (0 if no default).
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#define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_COUNT( \
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decl_traits) \
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BOOST_PP_IIF(BOOST_PP_LIST_IS_CONS( \
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BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits)), \
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BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_COUNT_ \
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, \
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0 BOOST_PP_TUPLE_EAT(1) \
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)(BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits))
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#endif // #include guard
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