CVS: boost/boost/fusion/sequence/view/transform_view/detail at_impl.hpp, NONE, 1.1

Update of /cvsroot/boost/boost/boost/fusion/sequence/view/transform_view/detail
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv770/detail

Added Files:
        at_impl.hpp 
Log Message:
added at impl for transform view random access

--- NEW FILE: at_impl.hpp ---
/*=============================================================================
    Copyright (c) 2001-2006 Joel de Guzman
    Copyright (c) 2005-2006 Dan Marsden

    Use, modification and distribution is subject to 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_AT_IMPL_20061029_1946)
#define BOOST_FUSION_AT_IMPL_20061029_1946

#include <boost/mpl/apply.hpp>
#include 
<boost/fusion/sequence/view/transform_view/detail/apply_transform_result.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>

namespace boost { namespace fusion {
    struct transform_view_tag;
    struct transform_view2_tag;

    namespace extension
    {
        template<typename Tag>
        struct at_impl;

        template<>
        struct at_impl<transform_view_tag>
        {
            template<typename Seq, typename N>
            struct apply
            {
                typedef typename Seq::transform_type F;
                typedef detail::apply_transform_result<F> transform_type;
                typedef typename boost::fusion::result_of::at<typename 
Seq::sequence_type, N>::type value_type;
                typedef typename mpl::apply<transform_type, value_type>::type 
type;

                static type call(Seq& seq)
                {
                    return seq.f(boost::fusion::at<N>(seq.seq));
                }
            };
        };

        template<>
        struct at_impl<transform_view2_tag>
        {
            template<typename Seq, typename N>
            struct apply
            {
                typedef typename Seq::transform_type F;
                typedef detail::apply_transform_result<F> transform_type;
                typedef typename boost::fusion::result_of::at<typename 
Seq::sequence1_type, N>::type value1_type;
                typedef typename boost::fusion::result_of::at<typename 
Seq::sequence2_type, N>::type value2_type;
                typedef typename mpl::apply<transform_type, value1_type, 
value2_type>::type type;

                static type call(Seq& seq)
                {
                    return seq.f(boost::fusion::at<N>(seq.seq1), 
boost::fusion::at<N>(seq.seq2));
                }
            };
        };
    }
}}

#endif


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