/*=============================================================================

    Copyright (c) 2003 Joel de Guzman

    Copyright (c) 2004 Peder Holt



    Use, modification and distribution is subject to 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(FUSION_ITERATOR_DETAIL_TRANSFORM_VIEW_ITERATOR_DEREF_TRAITS_HPP)

#define FUSION_ITERATOR_DETAIL_TRANSFORM_VIEW_ITERATOR_DEREF_TRAITS_HPP



#include <boost/spirit/fusion/detail/config.hpp>

#include <boost/spirit/fusion/iterator/deref.hpp>

#include <boost/spirit/fusion/iterator/value_of.hpp>



namespace boost { namespace fusion

{

    struct transform_view_iterator_tag;



    namespace transform_view_detail {

        template<typename Iterator>

        struct deref_traits_impl {

            typedef typename

                meta::value_of<typename Iterator::first_type>::type

            value_type;



            typedef typename Iterator::transform_type transform_type;

            typedef typename fusion_apply1<transform_type, value_type>::type type;



            static type

            call(Iterator const& i);

        };

        

        template<typename Iterator>

        BOOST_DEDUCED_TYPENAME deref_traits_impl<Iterator>::type 

        deref_traits_impl<Iterator>::call(Iterator const& i) 

        {

            return i.f(*i.first);

        }

    }



    namespace meta

    {

        template <typename Tag>

        struct deref_impl;



        template <>

        struct deref_impl<transform_view_iterator_tag>

        {

            template <typename Iterator>

            struct apply : transform_view_detail::deref_traits_impl<Iterator>

            {};

        };

    }

}}



#endif





