| /*============================================================================= | |
| Copyright (c) 2001-2006 Joel de Guzman | |
| 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_NEXT_IMPL_06052005_0900) | |
| #define FUSION_NEXT_IMPL_06052005_0900 | |
| #include <boost/fusion/algorithm/query/detail/find_if.hpp> | |
| #include <boost/fusion/iterator/value_of.hpp> | |
| #include <boost/mpl/eval_if.hpp> | |
| #include <boost/mpl/identity.hpp> | |
| #include <boost/mpl/lambda.hpp> | |
| #include <boost/mpl/quote.hpp> | |
| #include <boost/mpl/bind.hpp> | |
| #include <boost/mpl/placeholders.hpp> | |
| namespace boost { namespace fusion | |
| { | |
| struct filter_view_iterator_tag; | |
| template <typename Category, typename First, typename Last, typename Pred> | |
| struct filter_iterator; | |
| namespace extension | |
| { | |
| template <typename Tag> | |
| struct next_impl; | |
| template <> | |
| struct next_impl<filter_view_iterator_tag> | |
| { | |
| template <typename Iterator> | |
| struct apply | |
| { | |
| typedef typename Iterator::first_type first_type; | |
| typedef typename Iterator::last_type last_type; | |
| typedef typename Iterator::pred_type pred_type; | |
| typedef typename Iterator::category category; | |
| typedef typename | |
| mpl::eval_if< | |
| result_of::equal_to<first_type, last_type> | |
| , mpl::identity<last_type> | |
| , result_of::next<first_type> | |
| >::type | |
| next_type; | |
| typedef typename | |
| detail::static_find_if< | |
| next_type | |
| , last_type | |
| , mpl::bind1< | |
| typename mpl::lambda<pred_type>::type | |
| , mpl::bind1<mpl::quote1<result_of::value_of>,mpl::_1> | |
| > | |
| > | |
| filter; | |
| typedef filter_iterator< | |
| category, typename filter::type, last_type, pred_type> | |
| type; | |
| static type | |
| call(Iterator const& i) | |
| { | |
| return type(filter::call(i.first)); | |
| } | |
| }; | |
| }; | |
| } | |
| }} | |
| #endif | |