1 /*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2005-2006 Dan Marsden
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 ==============================================================================*/
8 #if !defined(FUSION_PREV_IMPL_13122005_2110)
9 #define FUSION_PREV_IMPL_13122005_2110
11 #include <boost/fusion/support/config.hpp>
12 #include <boost/fusion/iterator/prior.hpp>
14 namespace boost { namespace fusion
16 struct transform_view_iterator_tag;
17 struct transform_view_iterator2_tag;
19 template<typename First, typename F>
20 struct transform_view_iterator;
22 template <typename First1, typename First2, typename F>
23 struct transform_view_iterator2;
27 template<typename Tag>
32 struct prior_impl<transform_view_iterator_tag>
34 template<typename Iterator>
37 typedef typename Iterator::first_type first_type;
38 typedef typename result_of::prior<first_type>::type prior_type;
39 typedef typename Iterator::transform_type transform_type;
40 typedef transform_view_iterator<prior_type, transform_type> type;
42 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
44 call(Iterator const& i)
46 return type(fusion::prior(i.first), i.f);
53 struct prior_impl<transform_view_iterator2_tag>
55 template<typename Iterator>
58 typedef typename Iterator::first1_type first1_type;
59 typedef typename Iterator::first2_type first2_type;
60 typedef typename result_of::prior<first1_type>::type prior1_type;
61 typedef typename result_of::prior<first2_type>::type prior2_type;
62 typedef typename Iterator::transform_type transform_type;
63 typedef transform_view_iterator2<prior1_type, prior2_type, transform_type> type;
65 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
67 call(Iterator const& i)
69 return type(fusion::prior(i.first1), fusion::prior(i.first2), i.f);