text: /*=============================================================================
      Copyright (c) 2001-2011 Hartmut Kaiser
  
      Distributed under the Boost Software License, Version 1.0. (See accompanying
      file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  ==============================================================================*/
  #if !defined(BOOST_SPIRIT_HANDLES_CONTAINER_DEC_18_2010_0920AM)
  #define BOOST_SPIRIT_HANDLES_CONTAINER_DEC_18_2010_0920AM
  
  #if defined(_MSC_VER)
  #pragma once
  #endif
  
  #include <boost/spirit/home/support/attributes_fwd.hpp>
  #include <boost/mpl/bool.hpp>
  #include <boost/mpl/or.hpp>
  #include <boost/mpl/not.hpp>
  #include <boost/mpl/find_if.hpp>
  #include <boost/type_traits/is_same.hpp>
  
  namespace boost { namespace spirit { namespace traits
  {
      // Finds out whether a component handles container attributes intrinsically
      // (or whether container attributes need to be split up separately).
      template <typename T, typename Attribute, typename Context
              , typename Iterator, typename Enable>
      struct handles_container : mpl::false_ {};
  
      template <typename Subject, typename Attribute, typename Context
              , typename Iterator>
      struct unary_handles_container
        : handles_container<Subject, Attribute, Context, Iterator> {};
  
      template <typename Left, typename Right, typename Attribute
              , typename Context, typename Iterator>
      struct binary_handles_container
        : mpl::or_<
              handles_container<Left, Attribute, Context, Iterator>
            , handles_container<Right, Attribute, Context, Iterator> >
      {};
  
      template <typename Elements, typename Attribute, typename Context
              , typename Iterator>
      struct nary_handles_container
        : mpl::not_<
              is_same<
                  typename mpl::find_if<
                      Elements, handles_container<mpl::_, Attribute
                                                , Context, Iterator>
                  >::type
                , typename mpl::end<Elements>::type> >
      {};
  }}}
  
  #endif
  