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- /*=============================================================================
- Copyright (c) 2001-2011 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/support/config.hpp>
- #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;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- 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;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Iterator const& i)
- {
- return type(fusion::prior(i.first1), fusion::prior(i.first2), i.f);
- }
- };
- };
- }
- }}
- #endif
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