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+
+// 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
+