ceph/src/boost/libs/local_function/include/boost/local_function/detail/preprocessor/keyword/facility/remove.hpp

   1
   2 // Copyright (C) 2009-2012 Lorenzo Caminiti
   3 // Distributed under the Boost Software License, Version 1.0
   4 // (see accompanying file LICENSE_1_0.txt or a copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 // Home at http://www.boost.org/libs/local_function
   7
   8 #ifndef BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_HPP_
   9 #define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_HPP_
  10
  11 #include <boost/preprocessor/control/iif.hpp>
  12 #include <boost/preprocessor/tuple/eat.hpp>
  13 #include <boost/preprocessor/config/config.hpp>
  14 #include <boost/preprocessor/cat.hpp>
  15
  16 // PRIVATE //
  17
  18 // From PP_EXPAND (my own reentrant version).
  19 #if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC() && \
  20         ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_DMC()
  21 #   define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_(x) \
  22         BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_I_(x)
  23 #else
  24 #   define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_(x) \
  25         BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_OO_((x))
  26 #   define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_OO_( \
  27             par) \
  28         BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_I_ ## par
  29 #endif
  30 #define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_I_(x) x
  31
  32 // PUBLIC //
  33
  34 // `is_front_macro(tokens)` is 1 if `tokens` start with keyword to remove.
  35 // `removing_prefix ## <keyword-to-remove>` must expand to nothing, else 0.
  36 #define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_FRONT( \
  37         tokens, is_front_macro, removing_prefix) \
  38     /* without EXPAND doesn't expand on MSVC */ \
  39     BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_EXPAND_( \
  40         BOOST_PP_IIF(is_front_macro(tokens), \
  41             BOOST_PP_CAT \
  42         , \
  43             tokens BOOST_PP_TUPLE_EAT(2) \
  44         )(removing_prefix, tokens) \
  45     )
  46
  47 // `is_back_macro(tokens)` is 1 iff `tokens` end with keyword to remove.
  48 // `<keyword-to-remove> ## removing_postfix` must expand to nothing, else 0.
  49 #define BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_FACILITY_REMOVE_BACK( \
  50         tokens, is_back_macro, removing_prefix) \
  51     BOOST_PP_IIF(is_back_macro(tokens), \
  52         BOOST_PP_CAT \
  53     , \
  54         tokens BOOST_PP_TUPLE_EAT(2) \
  55     )(tokens, removing_postfix)
  56
  57 #endif // #include guard
  58