/*=============================================================================
    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_PRIOR_IMPL_JUL_07_2011_1348PM)
#define BOOST_FUSION_SINGLE_VIEW_PRIOR_IMPL_JUL_07_2011_1348PM

#include <boost/fusion/support/config.hpp>
#include <boost/mpl/prior.hpp>

namespace boost {
namespace fusion {
struct single_view_iterator_tag;

template <typename Sequence, typename Pos>
struct single_view_iterator;

namespace extension {
template <typename Tag>
struct prior_impl;

template <>
struct prior_impl<single_view_iterator_tag>
{
    template <typename Iterator>
    struct apply
    {
        typedef single_view_iterator<
        typename Iterator::single_view_type,
                 typename mpl::prior<typename Iterator::position>::type>
                 type;

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

}
}

#endif
