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    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2005 Eric Niebler

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at
#if !defined(FUSION_DEREF_IMPL_07172005_0831)
#define FUSION_DEREF_IMPL_07172005_0831

#include <boost/mpl/eval_if.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/add_reference.hpp>

namespace boost { namespace fusion
    struct cons_iterator_tag;

    namespace extension
        template <typename Tag>
        struct deref_impl;

        template <>
        struct deref_impl<cons_iterator_tag>
            template <typename Iterator>
            struct apply 
                typedef typename Iterator::cons_type cons_type;
                typedef typename cons_type::car_type value_type;
                typedef typename mpl::eval_if<
                  , add_reference<typename add_const<value_type>::type>
                  , add_reference<value_type> >::type
                static type
                call(Iterator const& i)