/*============================================================================= | |
Copyright (c) 2001-2006 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 |