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96 lines
3.1 KiB
96 lines
3.1 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2011 Eric Niebler
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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(BOOST_FUSION_SEGMENTED_FIND_IF_HPP_INCLUDED)
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#define BOOST_FUSION_SEGMENTED_FIND_IF_HPP_INCLUDED
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#include <boost/fusion/support/config.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/fusion/algorithm/query/find_if_fwd.hpp>
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#include <boost/fusion/iterator/equal_to.hpp>
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#include <boost/fusion/sequence/intrinsic/end.hpp>
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#include <boost/fusion/support/segmented_fold_until.hpp>
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namespace boost { namespace fusion { namespace detail
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{
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template <typename Pred>
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struct segmented_find_if_fun
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{
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template <typename Sequence, typename State, typename Context>
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struct apply
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{
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typedef
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typename result_of::find_if<Sequence, Pred>::type
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iterator_type;
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typedef
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typename result_of::equal_to<
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iterator_type
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, typename result_of::end<Sequence>::type
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>::type
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continue_type;
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typedef
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typename mpl::eval_if<
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continue_type
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, mpl::identity<State>
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, result_of::make_segmented_iterator<
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iterator_type
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, Context
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>
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>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call(Sequence& seq, State const&state, Context const& context, segmented_find_if_fun)
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{
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return call_impl(seq, state, context, continue_type());
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call_impl(Sequence&, State const&state, Context const&, mpl::true_)
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{
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return state;
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call_impl(Sequence& seq, State const&, Context const& context, mpl::false_)
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{
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return fusion::make_segmented_iterator(fusion::find_if<Pred>(seq), context);
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}
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};
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};
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template <typename Sequence, typename Pred>
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struct result_of_segmented_find_if
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{
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struct filter
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{
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typedef
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typename result_of::segmented_fold_until<
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Sequence
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, typename result_of::end<Sequence>::type
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, segmented_find_if_fun<Pred>
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>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call(Sequence& seq)
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{
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return fusion::segmented_fold_until(
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seq
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, fusion::end(seq)
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, segmented_find_if_fun<Pred>());
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}
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};
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typedef typename filter::type type;
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};
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}}}
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#endif
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