| |
| // Copyright (C) 2009-2012 Lorenzo Caminiti |
| // Distributed under the Boost Software License, Version 1.0 |
| // (see accompanying file LICENSE_1_0.txt or a copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| // Home at http://www.boost.org/libs/local_function |
| |
| #ifndef BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_RETURN_COUNT_HPP_ |
| #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_RETURN_COUNT_HPP_ |
| |
| #include <boost/local_function/aux_/preprocessor/traits/decl_/set_error.hpp> |
| #include <boost/local_function/aux_/preprocessor/traits/decl_returns.hpp> |
| #include <boost/preprocessor/control/iif.hpp> |
| #include <boost/preprocessor/facilities/empty.hpp> |
| #include <boost/preprocessor/tuple/eat.hpp> |
| #include <boost/preprocessor/comparison/greater.hpp> |
| #include <boost/preprocessor/list/size.hpp> |
| |
| // PRIVATE // |
| |
| #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_RETURN_COUNT( \ |
| decl_traits) \ |
| BOOST_PP_IIF(BOOST_PP_GREATER(BOOST_PP_LIST_SIZE( \ |
| BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits)), 1), \ |
| BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_SET_ERROR \ |
| , /* else do nothing (keeping previous error, if any) */ \ |
| decl_traits BOOST_PP_TUPLE_EAT(2) \ |
| )(decl_traits, /* trailing `EMPTY` because error might not be present */ \ |
| ERROR_cannot_specify_more_than_one_return_type BOOST_PP_EMPTY) |
| |
| #endif // #include guard |
| |