/*=============================================================================

    Copyright (c) 2001-2006 Joel de Guzman



    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(FUSION_PRIOR_IMPL_05042005_1145)

#define FUSION_PRIOR_IMPL_05042005_1145



#include <boost/fusion/container/vector/vector_iterator.hpp>



namespace boost { namespace fusion

{

    struct vector_iterator_tag;

    template <typename Vector, int N>

    struct vector_iterator;



    namespace extension

    {

        template <typename Tag>

        struct prior_impl;



        template <>

        struct prior_impl<vector_iterator_tag>

        {

            template <typename Iterator>

            struct apply 

            {

                typedef typename Iterator::vector vector;

                typedef typename Iterator::index index;

                typedef vector_iterator<vector, index::value-1> type;



                static type

                call(Iterator const& i)

                {

                    return type(i.vec);

                }

            };

        };

    }

}}



#endif

