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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_DETAIL_PP_KEYWORD_FACILITY_REMOVE_HPP_
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#define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_HPP_
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#include <boost/preprocessor/control/iif.hpp>
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#include <boost/preprocessor/tuple/eat.hpp>
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#include <boost/preprocessor/config/config.hpp>
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#include <boost/preprocessor/cat.hpp>
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// PRIVATE //
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// From PP_EXPAND (my own reentrant version).
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#if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC() && \
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~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_DMC()
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# define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_(x) \
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BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_I_(x)
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#else
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# define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_(x) \
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BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_OO_((x))
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# define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_OO_( \
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par) \
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BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_I_ ## par
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#endif
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#define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_I_(x) x
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// PUBLIC //
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// `is_front_macro(tokens)` is 1 if `tokens` start with keyword to remove.
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// `removing_prefix ## <keyword-to-remove>` must expand to nothing, else 0.
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#define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_FRONT( \
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tokens, is_front_macro, removing_prefix) \
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/* without EXPAND doesn't expand on MSVC */ \
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BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_( \
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BOOST_PP_IIF(is_front_macro(tokens), \
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BOOST_PP_CAT \
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, \
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tokens BOOST_PP_TUPLE_EAT(2) \
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)(removing_prefix, tokens) \
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)
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// `is_back_macro(tokens)` is 1 iff `tokens` end with keyword to remove.
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// `<keyword-to-remove> ## removing_postfix` must expand to nothing, else 0.
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#define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_BACK( \
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tokens, is_back_macro, removing_prefix) \
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BOOST_PP_IIF(is_back_macro(tokens), \
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BOOST_PP_CAT \
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, \
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tokens BOOST_PP_TUPLE_EAT(2) \
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)(tokens, removing_postfix)
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#endif // #include guard
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