/*=============================================================================
    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_AT_IMPL_JUL_07_2011_1348PM)
#define BOOST_FUSION_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM

#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_tag;

namespace extension {
template<typename Tag>
struct at_impl;

template<>
struct at_impl<single_view_tag>
{
    template<typename Sequence, typename N>
    struct apply
    {
        BOOST_MPL_ASSERT((mpl::equal_to<N, mpl::int_<0> >));
        typedef typename Sequence::value_type type;

        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
        static type
        call(Sequence& seq)
        {
            return seq.val;
        }
    };
};
}

}
}

#endif
