83 lines
4.8 KiB
Plaintext
83 lines
4.8 KiB
Plaintext
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//==============================================================================
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// Copyright 2003 - 2011 LASMEA UMR 6602 CNRS/Univ. Clermont II
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// Copyright 2009 - 2011 LRI UMR 8623 CNRS/Univ Paris Sud XI
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// Copyright 2011 Eric Niebler
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//==============================================================================
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#ifndef BOOST_PROTO_PREPROCESSOR_REMOVE_TYPENAME_HPP_INCLUDED
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#define BOOST_PROTO_PREPROCESSOR_REMOVE_TYPENAME_HPP_INCLUDED
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/*!
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* \file
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* \brief Defines the BOOST_PROTO_REMOVE_TYPENAME macro
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*/
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/expand.hpp>
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#include <boost/preprocessor/tuple/eat.hpp>
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#include <boost/preprocessor/control/iif.hpp>
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#include <boost/preprocessor/detail/is_unary.hpp>
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//==============================================================================
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// Boost.Preprocessor author P. Mensodines confirmed on an Boost email thread
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// (subject ``check if a token is a keyword (was "BOOST_PP_IS_UNARY()")'')
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// that it is OK to used `PP_IS_UNARY()` to check if tokens match predefined
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// "keyword" as it is done by the macros below (even if `PP_IS_UNARY()` is
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// technically only part of Boost.Preprocessor private API).
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//==============================================================================
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//==============================================================================
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// `checking_prefix ## tokens` expand to unary (e.g., `(1)`) iff `tokens` start
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// with keyword to check.
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//==============================================================================
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#define BOOST_PROTO_DETAILS_KEYWORD_FACILITY_IS_FRONT(T, CHECKING_PREFIX) \
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BOOST_PP_IS_UNARY(BOOST_PP_CAT(CHECKING_PREFIX, T)) \
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/**/
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//==============================================================================
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// `is_front_macro(tokens)` is 1 iff `tokens` start with keyword to remove.
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// `removing_prefix ## <keyword-to-remove>` must expand to nothing.
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//==============================================================================
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#define BOOST_PROTO_DETAILS_KEYWORD_FACILITY_REMOVE_FRONT(TOKENS, IS_FRONT_MACRO, REMOVING_PREFIX) \
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BOOST_PP_EXPAND( /* without EXPAND doesn't expand on MSVC */ \
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BOOST_PP_IIF( \
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IS_FRONT_MACRO(TOKENS) \
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, BOOST_PP_CAT \
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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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/**/
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#define BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_IS_typename (1) /* unary */
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#define typename_BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_IS (1) /* unary */
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#define BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_REMOVE_typename /* nothing */
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#define typename_BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_REMOVE /* nothing */
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#define BOOST_PROTO_DETAILS_KEYWORD_IS_TYPENAME_FRONT(TOKENS) \
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BOOST_PROTO_DETAILS_KEYWORD_FACILITY_IS_FRONT(TOKENS, BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_IS_) \
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/**/
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//==============================================================================
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/*!
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* \ingroup preprocessor
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* For any symbol \c X, this macro returns the same symbol from which a potential
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* leading \c typename keyword has been removed. If no typename keyword is present,
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* this macros evaluates to \c X itself without error.
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*
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* The original implementation of this macro is from Lorenzo Caminiti.
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*
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* \param X Symbol to remove \c typename from
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*/
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//==============================================================================
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#define BOOST_PROTO_REMOVE_TYPENAME(X) \
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BOOST_PROTO_DETAILS_KEYWORD_FACILITY_REMOVE_FRONT( \
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X \
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, BOOST_PROTO_DETAILS_KEYWORD_IS_TYPENAME_FRONT \
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, BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_REMOVE_ \
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) \
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/**/
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#endif
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