ceph/src/boost/libs/local_function/include/boost/local_function/aux_/preprocessor/traits/decl_/validate_/return_count.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_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