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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 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(FUSION_END_IMPL_20060123_2208)
#define FUSION_END_IMPL_20060123_2208
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/view/zip_view/zip_view_iterator_fwd.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/sequence/intrinsic/front.hpp>
#include <boost/fusion/iterator/advance.hpp>
#include <boost/fusion/algorithm/transformation/transform.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/is_reference.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/mpl/min.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/type_traits/is_same.hpp>
namespace boost { namespace fusion {
struct zip_view_tag;
namespace detail
{
template<typename SeqRef, typename M>
struct get_endpoint
{
typedef typename remove_reference<SeqRef>::type Seq;
typedef typename result_of::begin<Seq>::type begin;
typedef typename result_of::advance<begin, M>::type type;
};
template<typename M>
struct endpoints
{
template<typename T>
struct result;
template<typename M1, typename SeqRef>
struct result<endpoints<M1>(SeqRef)>
: mpl::eval_if<is_same<SeqRef, unused_type const&>,
mpl::identity<unused_type>,
get_endpoint<SeqRef, M> >
{
BOOST_MPL_ASSERT((is_reference<SeqRef>));
};
template<typename Seq>
BOOST_FUSION_GPU_ENABLED
typename result<endpoints(Seq&)>::type
operator()(Seq& seq) const
{
return fusion::advance<M>(fusion::begin(seq));
}
template<typename Seq>
BOOST_FUSION_GPU_ENABLED
typename result<endpoints(Seq const&)>::type
operator()(Seq const& seq) const
{
return fusion::advance<M>(fusion::begin(seq));
}
BOOST_FUSION_GPU_ENABLED
unused_type operator()(unused_type const&) const
{
return unused_type();
}
};
}
namespace extension
{
template<typename Tag>
struct end_impl;
template<>
struct end_impl<zip_view_tag>
{
template<typename Sequence>
struct apply
{
typedef zip_view_iterator<
typename result_of::transform<typename Sequence::sequences, detail::endpoints<typename Sequence::size> >::type,
typename Sequence::category> type;
BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& sequence)
{
return type(
fusion::transform(sequence.sequences_, detail::endpoints<typename Sequence::size>()));
}
};
};
}
}}
#endif
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