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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_PP_DECL_TRAITS_VALIDATE_RETURN_COUNT_HPP_ | |
9 | #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_RETURN_COUNT_HPP_ | |
10 | ||
11 | #include <boost/local_function/aux_/preprocessor/traits/decl_/set_error.hpp> | |
12 | #include <boost/local_function/aux_/preprocessor/traits/decl_returns.hpp> | |
13 | #include <boost/preprocessor/control/iif.hpp> | |
14 | #include <boost/preprocessor/facilities/empty.hpp> | |
15 | #include <boost/preprocessor/tuple/eat.hpp> | |
16 | #include <boost/preprocessor/comparison/greater.hpp> | |
17 | #include <boost/preprocessor/list/size.hpp> | |
18 | ||
19 | // PRIVATE // | |
20 | ||
21 | #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_RETURN_COUNT( \ | |
22 | decl_traits) \ | |
23 | BOOST_PP_IIF(BOOST_PP_GREATER(BOOST_PP_LIST_SIZE( \ | |
24 | BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits)), 1), \ | |
25 | BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_SET_ERROR \ | |
26 | , /* else do nothing (keeping previous error, if any) */ \ | |
27 | decl_traits BOOST_PP_TUPLE_EAT(2) \ | |
28 | )(decl_traits, /* trailing `EMPTY` because error might not be present */ \ | |
29 | ERROR_cannot_specify_more_than_one_return_type BOOST_PP_EMPTY) | |
30 | ||
31 | #endif // #include guard | |
32 |