Chris@16: 
Chris@16: // Copyright (C) 2009-2012 Lorenzo Caminiti
Chris@16: // Distributed under the Boost Software License, Version 1.0
Chris@16: // (see accompanying file LICENSE_1_0.txt or a copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: // Home at http://www.boost.org/libs/local_function
Chris@16: 
Chris@16: #ifndef BOOST_LOCAL_FUNCTION_AUX_DECL_HPP_
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_DECL_HPP_
Chris@16: 
Chris@16: #include <boost/local_function/aux_/macro/code_/result.hpp>
Chris@16: #include <boost/local_function/aux_/macro/code_/bind.hpp>
Chris@16: #include <boost/local_function/aux_/macro/code_/functor.hpp>
Chris@16: #include <boost/local_function/aux_/preprocessor/traits/decl.hpp>
Chris@16: #include <boost/local_function/aux_/preprocessor/traits/decl_error.hpp>
Chris@16: #include <boost/scope_exit.hpp>
Chris@16: #include <boost/mpl/assert.hpp>
Chris@16: #include <boost/preprocessor/control/iif.hpp>
Chris@16: #include <boost/preprocessor/facilities/is_empty.hpp>
Chris@16: #include <boost/preprocessor/list/adt.hpp>
Chris@16: #include <boost/preprocessor/tuple/eat.hpp>
Chris@16: 
Chris@16: // PRIVATE //
Chris@16: 
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_DECL_OK_(id, typename01, decl_traits) \
Chris@16:     BOOST_LOCAL_FUNCTION_AUX_CODE_RESULT(id, typename01, decl_traits) \
Chris@16:     BOOST_LOCAL_FUNCTION_AUX_CODE_BIND(id, typename01, decl_traits) \
Chris@16:     BOOST_LOCAL_FUNCTION_AUX_CODE_FUNCTOR(id, typename01, decl_traits) 
Chris@16: 
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_DECL_ERROR_(id, typename01, decl_traits) \
Chris@16:     BOOST_PP_IIF(BOOST_PP_LIST_IS_CONS( \
Chris@16:             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits)), \
Chris@16:         /* return specified, so no result type before this macro expansion */ \
Chris@16:         BOOST_PP_TUPLE_EAT(1) \
Chris@16:     , \
Chris@16:         /* even if error, must declare result type to prevent additional */ \
Chris@16:         /* error due to result type appearing before this macro expansion */ \
Chris@16:         BOOST_LOCAL_FUNCTION_AUX_CODE_RESULT_DECL \
Chris@16:     )(id) \
Chris@16:     ; /* close eventual previous statements, otherwise it has no effect */ \
Chris@16:     BOOST_MPL_ASSERT_MSG(false, /* always fails (there's an error) */ \
Chris@16:             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR_MSG(decl_traits), ())\
Chris@16:     ; /* must close ASSERT macro for eventual use within class scope */
Chris@16: 
Chris@16: // PUBLIC //
Chris@16: 
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR \
Chris@16:     BOOST_LOCAL_FUNCTION_AUX_SYMBOL( (args) )
Chris@16: 
Chris@16: // Undefine local function bound args global variable. Actual declaration of
Chris@16: // this variable is made using SFINAE mechanisms by each local function macro.
Chris@16: extern boost::scope_exit::detail::undeclared
Chris@16:         BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR;
Chris@16: 
Chris@16: // sign_params: parsed parenthesized params.
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_DECL(id, typename01, decl_traits) \
Chris@16:     BOOST_PP_IIF(BOOST_PP_IS_EMPTY( \
Chris@16:             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR_MSG(decl_traits)), \
Chris@16:         BOOST_LOCAL_FUNCTION_AUX_DECL_OK_ \
Chris@16:     , \
Chris@16:         BOOST_LOCAL_FUNCTION_AUX_DECL_ERROR_ \
Chris@16:     )(id, typename01, decl_traits)
Chris@16: 
Chris@16: #endif // #include guard
Chris@16: