| /*============================================================================= |
| 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(FUSION_PREV_IMPL_13122005_2110) |
| #define FUSION_PREV_IMPL_13122005_2110 |
| |
| #include <boost/fusion/iterator/prior.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| struct transform_view_iterator_tag; |
| struct transform_view_iterator2_tag; |
| |
| template<typename First, typename F> |
| struct transform_view_iterator; |
| |
| template <typename First1, typename First2, typename F> |
| struct transform_view_iterator2; |
| |
| namespace extension |
| { |
| template<typename Tag> |
| struct prior_impl; |
| |
| // Unary Version |
| template<> |
| struct prior_impl<transform_view_iterator_tag> |
| { |
| template<typename Iterator> |
| struct apply |
| { |
| typedef typename Iterator::first_type first_type; |
| typedef typename result_of::prior<first_type>::type prior_type; |
| typedef typename Iterator::transform_type transform_type; |
| typedef transform_view_iterator<prior_type, transform_type> type; |
| |
| static type |
| call(Iterator const& i) |
| { |
| return type(fusion::prior(i.first), i.f); |
| } |
| }; |
| }; |
| |
| // Binary Version |
| template<> |
| struct prior_impl<transform_view_iterator2_tag> |
| { |
| template<typename Iterator> |
| struct apply |
| { |
| typedef typename Iterator::first1_type first1_type; |
| typedef typename Iterator::first2_type first2_type; |
| typedef typename result_of::prior<first1_type>::type prior1_type; |
| typedef typename result_of::prior<first2_type>::type prior2_type; |
| typedef typename Iterator::transform_type transform_type; |
| typedef transform_view_iterator2<prior1_type, prior2_type, transform_type> type; |
| |
| static type |
| call(Iterator const& i) |
| { |
| return type(fusion::prior(i.first1), fusion::prior(i.first2), i.f); |
| } |
| }; |
| }; |
| } |
| }} |
| |
| #endif |