/*=============================================================================
    Copyright (c) 2009 Christopher Schmidt

    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_FUSION_CONTAINER_MAP_DETAIL_DEREF_IMPL_HPP
#define BOOST_FUSION_CONTAINER_MAP_DETAIL_DEREF_IMPL_HPP

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/type_traits/is_const.hpp>

namespace boost {
namespace fusion {
namespace extension {
template <typename>
struct deref_impl;

template <>
struct deref_impl<map_iterator_tag>
{
    template <typename It>
    struct apply
    {
        typedef typename
        result_of::at<
        typename mpl::if_<
        is_const<typename It::seq_type>
        , typename It::seq_type::storage_type const
        , typename It::seq_type::storage_type
        >::type
        , typename It::index
        >::type
        type;

        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
        static type
        call(It const& it)
        {
            return fusion::at<typename It::index>(it.seq->get_data());
        }
    };
};
}
}
}

#endif
