/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2011 Eric Niebler

    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_FUSION_SINGLE_VIEW_DEREF_IMPL_05052005_0258)
#define BOOST_FUSION_SINGLE_VIEW_DEREF_IMPL_05052005_0258

#include <boost/fusion/support/config.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/mpl/equal_to.hpp>

namespace boost {
namespace fusion {
struct single_view_iterator_tag;

namespace extension {
template <typename Tag>
struct deref_impl;

template <>
struct deref_impl<single_view_iterator_tag>
{
    template <typename Iterator>
    struct apply
    {
        BOOST_MPL_ASSERT((mpl::equal_to<typename Iterator::position, mpl::int_<0> >));
        typedef typename Iterator::value_type type;

        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
        static type
        call(Iterator const& i)
        {
            return i.view.val;
        }
    };
};
}
}
}

#endif
