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88 lines
2.7 KiB
88 lines
2.7 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) 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_PRIOR_IMPL_20060124_2006)
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#define FUSION_PRIOR_IMPL_20060124_2006
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/view/zip_view/zip_view_iterator_fwd.hpp>
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#include <boost/fusion/iterator/prior.hpp>
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#include <boost/fusion/algorithm/transformation/transform.hpp>
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#include <boost/fusion/support/unused.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/type_traits/is_same.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/remove_const.hpp>
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namespace boost { namespace fusion {
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struct zip_view_iterator_tag;
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namespace detail
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{
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struct poly_prior
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{
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template<typename Sig>
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struct result;
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template<typename It>
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struct result<poly_prior(It)>
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{
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typedef typename remove_const<
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typename remove_reference<It>::type>::type it;
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typedef typename mpl::eval_if<is_same<it, unused_type>,
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mpl::identity<unused_type>,
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result_of::prior<it> >::type type;
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};
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template<typename It>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename result<poly_prior(It)>::type
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operator()(const It& it) const
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{
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return fusion::prior(it);
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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unused_type operator()(unused_type const&) const
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{
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return unused_type();
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}
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};
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}
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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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template<>
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struct prior_impl<zip_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 zip_view_iterator<
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typename result_of::transform<typename Iterator::iterators, detail::poly_prior>::type,
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typename Iterator::category> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator const& it)
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{
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return type(
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fusion::transform(it.iterators_, detail::poly_prior()));
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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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