text: 
  // 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_THIS_COUNT_HPP_
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_THIS_COUNT_HPP_
  
  #include <boost/local_function/aux_/preprocessor/traits/decl_/set_error.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/decl_const_binds.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/decl_binds.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/append.hpp>
  #include <boost/preprocessor/list/size.hpp>
  
  // PUBLIC //
  
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_VALIDATE_THIS_COUNT( \
          decl_traits) \
      BOOST_PP_IIF(BOOST_PP_GREATER(BOOST_PP_LIST_SIZE(BOOST_PP_LIST_APPEND( \
              BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                      decl_traits), \
              BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES( \
                      decl_traits))), \
              1), \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_SET_ERROR \
      , /* 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_bind_object_this_multiple_times BOOST_PP_EMPTY)
  
  #endif // #include guard
  
  