projects / ceph.git / blame
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1 | //============================================================================== |
| 2 | // Copyright 2003 - 2011 LASMEA UMR 6602 CNRS/Univ. Clermont II | |
| 3 | // Copyright 2009 - 2011 LRI UMR 8623 CNRS/Univ Paris Sud XI | |
| 4 | // Copyright 2011 Eric Niebler | |
| 5 | // | |
| 6 | // Distributed under the Boost Software License, Version 1.0. | |
| 7 | // See accompanying file LICENSE.txt or copy at | |
| 8 | // http://www.boost.org/LICENSE_1_0.txt | |
| 9 | //============================================================================== | |
| 10 | #ifndef BOOST_PROTO_PREPROCESSOR_REMOVE_TYPENAME_HPP_INCLUDED | |
| 11 | #define BOOST_PROTO_PREPROCESSOR_REMOVE_TYPENAME_HPP_INCLUDED | |
| 12 | ||
| 13 | /*! | |
| 14 | * \file | |
| 15 | * \brief Defines the BOOST_PROTO_REMOVE_TYPENAME macro | |
| 16 | */ | |
| 17 | #include <boost/preprocessor/cat.hpp> | |
| 18 | #include <boost/preprocessor/expand.hpp> | |
| 19 | #include <boost/preprocessor/tuple/eat.hpp> | |
| 20 | #include <boost/preprocessor/control/iif.hpp> | |
| 21 | #include <boost/preprocessor/detail/is_unary.hpp> | |
| 22 | ||
| 23 | //============================================================================== | |
| 24 | // Boost.Preprocessor author P. Mensodines confirmed on an Boost email thread | |
| 25 | // (subject ``check if a token is a keyword (was "BOOST_PP_IS_UNARY()")'') | |
| 26 | // that it is OK to used `PP_IS_UNARY()` to check if tokens match predefined | |
| 27 | // "keyword" as it is done by the macros below (even if `PP_IS_UNARY()` is | |
| 28 | // technically only part of Boost.Preprocessor private API). | |
| 29 | //============================================================================== | |
| 30 | ||
| 31 | //============================================================================== | |
| 32 | // `checking_prefix ## tokens` expand to unary (e.g., `(1)`) iff `tokens` start | |
| 33 | // with keyword to check. | |
| 34 | //============================================================================== | |
| 35 | #define BOOST_PROTO_DETAILS_KEYWORD_FACILITY_IS_FRONT(T, CHECKING_PREFIX) \ | |
| 36 | BOOST_PP_IS_UNARY(BOOST_PP_CAT(CHECKING_PREFIX, T)) \ | |
| 37 | /**/ | |
| 38 | ||
| 39 | //============================================================================== | |
| 40 | // `is_front_macro(tokens)` is 1 iff `tokens` start with keyword to remove. | |
| 41 | // `removing_prefix ## <keyword-to-remove>` must expand to nothing. | |
| 42 | //============================================================================== | |
| 43 | #define BOOST_PROTO_DETAILS_KEYWORD_FACILITY_REMOVE_FRONT(TOKENS, IS_FRONT_MACRO, REMOVING_PREFIX) \ | |
| 44 | BOOST_PP_EXPAND( /* without EXPAND doesn't expand on MSVC */ \ | |
| 45 | BOOST_PP_IIF( \ | |
| 46 | IS_FRONT_MACRO(TOKENS) \ | |
| 47 | , BOOST_PP_CAT \ | |
| 48 | , TOKENS BOOST_PP_TUPLE_EAT(2) \ | |
| 49 | )(REMOVING_PREFIX, TOKENS) \ | |
| 50 | ) \ | |
| 51 | /**/ | |
| 52 | ||
| 53 | #define BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_IS_typename (1) /* unary */ | |
| 54 | #define typename_BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_IS (1) /* unary */ | |
| 55 | #define BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_REMOVE_typename /* nothing */ | |
| 56 | #define typename_BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_REMOVE /* nothing */ | |
| 57 | ||
| 58 | #define BOOST_PROTO_DETAILS_KEYWORD_IS_TYPENAME_FRONT(TOKENS) \ | |
| 59 | BOOST_PROTO_DETAILS_KEYWORD_FACILITY_IS_FRONT(TOKENS, BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_IS_) \ | |
| 60 | /**/ | |
| 61 | ||
| 62 | //============================================================================== | |
| 63 | /*! | |
| 64 | * \ingroup preprocessor | |
| 65 | * For any symbol \c X, this macro returns the same symbol from which a potential | |
| 66 | * leading \c typename keyword has been removed. If no typename keyword is present, | |
| 67 | * this macros evaluates to \c X itself without error. | |
| 68 | * | |
| 69 | * The original implementation of this macro is from Lorenzo Caminiti. | |
| 70 | * | |
| 71 | * \param X Symbol to remove \c typename from | |
| 72 | */ | |
| 73 | //============================================================================== | |
| 74 | #define BOOST_PROTO_REMOVE_TYPENAME(X) \ | |
| 75 | BOOST_PROTO_DETAILS_KEYWORD_FACILITY_REMOVE_FRONT( \ | |
| 76 | X \ | |
| 77 | , BOOST_PROTO_DETAILS_KEYWORD_IS_TYPENAME_FRONT \ | |
| 78 | , BOOST_PROTO_DETAILS_KEYWORD_TYPENAME_REMOVE_ \ | |
| 79 | ) \ | |
| 80 | /**/ | |
| 81 | ||
| 82 | #endif |