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77 lines
2.6 KiB
77 lines
2.6 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005-2006 Dan Marsden
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_PREV_IMPL_13122005_2110)
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#define FUSION_PREV_IMPL_13122005_2110
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/prior.hpp>
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namespace boost { namespace fusion
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{
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struct transform_view_iterator_tag;
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struct transform_view_iterator2_tag;
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template<typename First, typename F>
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struct transform_view_iterator;
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template <typename First1, typename First2, typename F>
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struct transform_view_iterator2;
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namespace extension
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{
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template<typename Tag>
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struct prior_impl;
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// Unary Version
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template<>
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struct prior_impl<transform_view_iterator_tag>
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{
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template<typename Iterator>
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struct apply
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{
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typedef typename Iterator::first_type first_type;
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typedef typename result_of::prior<first_type>::type prior_type;
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typedef typename Iterator::transform_type transform_type;
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typedef transform_view_iterator<prior_type, transform_type> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator const& i)
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{
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return type(fusion::prior(i.first), i.f);
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}
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};
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};
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// Binary Version
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template<>
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struct prior_impl<transform_view_iterator2_tag>
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{
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template<typename Iterator>
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struct apply
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{
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typedef typename Iterator::first1_type first1_type;
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typedef typename Iterator::first2_type first2_type;
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typedef typename result_of::prior<first1_type>::type prior1_type;
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typedef typename result_of::prior<first2_type>::type prior2_type;
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typedef typename Iterator::transform_type transform_type;
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typedef transform_view_iterator2<prior1_type, prior2_type, transform_type> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator const& i)
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{
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return type(fusion::prior(i.first1), fusion::prior(i.first2), i.f);
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}
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};
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};
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}
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}}
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#endif
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