text: /*=============================================================================
      Copyright (c) 2001-2011 Joel de Guzman
  
      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)
  ==============================================================================*/
  #ifndef BOOST_PP_IS_ITERATING
  #if !defined(BOOST_SPIRIT_AS_VARIANT_NOVEMBER_16_2007_0420PM)
  #define BOOST_SPIRIT_AS_VARIANT_NOVEMBER_16_2007_0420PM
  
  #include <boost/preprocessor/iterate.hpp>
  #include <boost/preprocessor/repetition/enum_params.hpp>
  #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
  #include <boost/preprocessor/repetition/repeat_from_to.hpp>
  #include <boost/variant/variant_fwd.hpp>
  #include <boost/fusion/include/size.hpp>
  #include <boost/fusion/include/begin.hpp>
  #include <boost/fusion/include/next.hpp>
  #include <boost/fusion/include/value_of.hpp>
  #include <boost/mpl/fold.hpp>
  #include <boost/mpl/vector.hpp>
  #include <boost/mpl/push_back.hpp>
  #include <boost/mpl/equal_to.hpp>
  #include <boost/mpl/contains.hpp>
  #include <boost/mpl/limits/list.hpp>
  #include <boost/type_traits/is_same.hpp>
  
  namespace boost { namespace spirit { namespace detail
  {
      template <int size>
      struct as_variant_impl;
  
  #if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
  #else
      template <>
      struct as_variant_impl<0>
      {
          template <typename Iterator>
          struct apply
          {
              typedef variant<> type;
          };
      };
  #endif
  
  #define BOOST_FUSION_NEXT_ITERATOR(z, n, data)                                  \
      typedef typename fusion::result_of::next<BOOST_PP_CAT(I, n)>::type          \
          BOOST_PP_CAT(I, BOOST_PP_INC(n));
  
  #define BOOST_FUSION_NEXT_CALL_ITERATOR(z, n, data)                             \
      typename gen::BOOST_PP_CAT(I, BOOST_PP_INC(n))                              \
          BOOST_PP_CAT(i, BOOST_PP_INC(n)) = fusion::next(BOOST_PP_CAT(i, n));
  
  #define BOOST_FUSION_VALUE_OF_ITERATOR(z, n, data)                              \
      typedef typename fusion::result_of::value_of<BOOST_PP_CAT(I, n)>::type      \
          BOOST_PP_CAT(T, n);
  
  #define BOOST_PP_FILENAME_1 <boost/spirit/home/support/detail/as_variant.hpp>
  
  #if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
  #define BOOST_PP_ITERATION_LIMITS (1, BOOST_MPL_LIMIT_LIST_SIZE)
  #else
  #define BOOST_PP_ITERATION_LIMITS (1, BOOST_VARIANT_LIMIT_TYPES)
  #endif
  
  #include BOOST_PP_ITERATE()
  
  #undef BOOST_FUSION_NEXT_ITERATOR
  #undef BOOST_FUSION_NEXT_CALL_ITERATOR
  #undef BOOST_FUSION_VALUE_OF_ITERATOR
  
      template <typename Sequence>
      struct as_variant
      {
          // build a variant generator being able to generate a variant holding
          // all of the types as given in the typelist
          typedef typename
              detail::as_variant_impl<fusion::result_of::size<Sequence>::value>
          gen;
  
          // use this generator to create the actual variant
          typedef typename gen::template apply<
                  typename fusion::result_of::begin<Sequence>::type
              >::type
          type;
      };
  }}}
  
  #endif
  #else // defined(BOOST_PP_IS_ITERATING)
  ///////////////////////////////////////////////////////////////////////////////
  //
  //  Preprocessor vertical repetition code
  //
  ///////////////////////////////////////////////////////////////////////////////
  
  #define N BOOST_PP_ITERATION()
  
      template <>
      struct as_variant_impl<N>
      {
          template <typename I0>
          struct apply
          {
              BOOST_PP_REPEAT(N, BOOST_FUSION_NEXT_ITERATOR, _)
              BOOST_PP_REPEAT(N, BOOST_FUSION_VALUE_OF_ITERATOR, _)
              typedef variant<BOOST_PP_ENUM_PARAMS(N, T)> type;
          };
      };
  
  #undef N
  #endif // defined(BOOST_PP_IS_ITERATING)
  
  