| /*============================================================================= |
| 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 |
| |