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