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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2005-2006 Dan Marsden
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_AT_IMPL_20061029_1946)
#define BOOST_FUSION_AT_IMPL_20061029_1946
#include <boost/mpl/apply.hpp>
#include <boost/fusion/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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