ceph/src/boost/boost/local_function/aux_/macro/decl.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_AUX_DECL_HPP_
   9 #define BOOST_LOCAL_FUNCTION_AUX_DECL_HPP_
  10
  11 #include <boost/local_function/aux_/macro/code_/result.hpp>
  12 #include <boost/local_function/aux_/macro/code_/bind.hpp>
  13 #include <boost/local_function/aux_/macro/code_/functor.hpp>
  14 #include <boost/local_function/aux_/preprocessor/traits/decl.hpp>
  15 #include <boost/local_function/aux_/preprocessor/traits/decl_error.hpp>
  16 #include <boost/scope_exit.hpp>
  17 #include <boost/mpl/assert.hpp>
  18 #include <boost/preprocessor/control/iif.hpp>
  19 #include <boost/preprocessor/facilities/is_empty.hpp>
  20 #include <boost/preprocessor/list/adt.hpp>
  21 #include <boost/preprocessor/tuple/eat.hpp>
  22
  23 // PRIVATE //
  24
  25 #define BOOST_LOCAL_FUNCTION_AUX_DECL_OK_(id, typename01, decl_traits) \
  26     BOOST_LOCAL_FUNCTION_AUX_CODE_RESULT(id, typename01, decl_traits) \
  27     BOOST_LOCAL_FUNCTION_AUX_CODE_BIND(id, typename01, decl_traits) \
  28     BOOST_LOCAL_FUNCTION_AUX_CODE_FUNCTOR(id, typename01, decl_traits)
  29
  30 #define BOOST_LOCAL_FUNCTION_AUX_DECL_ERROR_(id, typename01, decl_traits) \
  31     BOOST_PP_IIF(BOOST_PP_LIST_IS_CONS( \
  32             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits)), \
  33         /* return specified, so no result type before this macro expansion */ \
  34         BOOST_PP_TUPLE_EAT(1) \
  35     , \
  36         /* even if error, must declare result type to prevent additional */ \
  37         /* error due to result type appearing before this macro expansion */ \
  38         BOOST_LOCAL_FUNCTION_AUX_CODE_RESULT_DECL \
  39     )(id) \
  40     ; /* close eventual previous statements, otherwise it has no effect */ \
  41     BOOST_MPL_ASSERT_MSG(false, /* always fails (there's an error) */ \
  42             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR_MSG(decl_traits), ())\
  43     ; /* must close ASSERT macro for eventual use within class scope */
  44
  45 // PUBLIC //
  46
  47 #define BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR \
  48     BOOST_LOCAL_FUNCTION_AUX_SYMBOL( (args) )
  49
  50 // Undefine local function bound args global variable. Actual declaration of
  51 // this variable is made using SFINAE mechanisms by each local function macro.
  52 extern boost::scope_exit::detail::undeclared
  53         BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR;
  54
  55 // sign_params: parsed parenthesized params.
  56 #define BOOST_LOCAL_FUNCTION_AUX_DECL(id, typename01, decl_traits) \
  57     BOOST_PP_IIF(BOOST_PP_IS_EMPTY( \
  58             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR_MSG(decl_traits)), \
  59         BOOST_LOCAL_FUNCTION_AUX_DECL_OK_ \
  60     , \
  61         BOOST_LOCAL_FUNCTION_AUX_DECL_ERROR_ \
  62     )(id, typename01, decl_traits)
  63
  64 #endif // #include guard
  65