/*============================================================================= | |
Copyright (c) 2009 Hartmut Kaiser | |
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_NVIEW_DEREF_IMPL_SEP_24_2009_0818AM) | |
#define BOOST_FUSION_NVIEW_DEREF_IMPL_SEP_24_2009_0818AM | |
#include <boost/fusion/iterator/deref.hpp> | |
#include <boost/fusion/container/vector.hpp> | |
namespace boost { namespace fusion | |
{ | |
struct nview_iterator_tag; | |
namespace extension | |
{ | |
template<typename Tag> | |
struct deref_impl; | |
template<> | |
struct deref_impl<nview_iterator_tag> | |
{ | |
template<typename Iterator> | |
struct apply | |
{ | |
typedef typename Iterator::first_type first_type; | |
typedef typename Iterator::sequence_type sequence_type; | |
typedef typename result_of::deref<first_type>::type index; | |
typedef typename result_of::at< | |
typename sequence_type::sequence_type, index>::type type; | |
static type call(Iterator const& i) | |
{ | |
return at<index>(i.seq.seq); | |
} | |
}; | |
}; | |
} | |
}} | |
#endif | |