projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*============================================================================= |
| 2 | Copyright (c) 2001-2011 Joel de Guzman | |
| 3 | Copyright (c) 2006 Dan Marsden | |
| 4 | ||
| 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_PRIOR_IMPL_20060124_2006) | |
| 9 | #define FUSION_PRIOR_IMPL_20060124_2006 | |
| 10 | ||
| 11 | #include <boost/fusion/support/config.hpp> | |
| 12 | #include <boost/fusion/view/zip_view/zip_view_iterator_fwd.hpp> | |
| 13 | #include <boost/fusion/iterator/prior.hpp> | |
| 14 | #include <boost/fusion/algorithm/transformation/transform.hpp> | |
| 15 | #include <boost/fusion/support/unused.hpp> | |
| 16 | #include <boost/mpl/eval_if.hpp> | |
| 17 | #include <boost/mpl/identity.hpp> | |
| 18 | #include <boost/type_traits/is_same.hpp> | |
| 19 | #include <boost/type_traits/remove_reference.hpp> | |
| 20 | #include <boost/type_traits/remove_const.hpp> | |
| 21 | ||
| 22 | namespace boost { namespace fusion { | |
| 23 | ||
| 24 | struct zip_view_iterator_tag; | |
| 25 | ||
| 26 | namespace detail | |
| 27 | { | |
| 28 | struct poly_prior | |
| 29 | { | |
| 30 | template<typename Sig> | |
| 31 | struct result; | |
| 32 | ||
| 33 | template<typename It> | |
| 34 | struct result<poly_prior(It)> | |
| 35 | { | |
| 36 | typedef typename remove_const< | |
| 37 | typename remove_reference<It>::type>::type it; | |
| 38 | typedef typename mpl::eval_if<is_same<it, unused_type>, | |
| 39 | mpl::identity<unused_type>, | |
| 40 | result_of::prior<it> >::type type; | |
| 41 | }; | |
| 42 | ||
| 43 | template<typename It> | |
| 44 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 45 | typename result<poly_prior(It)>::type | |
| 46 | operator()(const It& it) const | |
| 47 | { | |
| 48 | return fusion::prior(it); | |
| 49 | } | |
| 50 | ||
| 51 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 52 | unused_type operator()(unused_type const&) const | |
| 53 | { | |
| 54 | return unused_type(); | |
| 55 | } | |
| 56 | }; | |
| 57 | } | |
| 58 | ||
| 59 | namespace extension | |
| 60 | { | |
| 61 | template<typename Tag> | |
| 62 | struct prior_impl; | |
| 63 | ||
| 64 | template<> | |
| 65 | struct prior_impl<zip_view_iterator_tag> | |
| 66 | { | |
| 67 | template<typename Iterator> | |
| 68 | struct apply | |
| 69 | { | |
| 70 | typedef zip_view_iterator< | |
| 71 | typename result_of::transform<typename Iterator::iterators, detail::poly_prior>::type, | |
| 72 | typename Iterator::category> type; | |
| 73 | ||
| 74 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 75 | static type | |
| 76 | call(Iterator const& it) | |
| 77 | ||
| 78 | { | |
| 79 | return type( | |
| 80 | fusion::transform(it.iterators_, detail::poly_prior())); | |
| 81 | } | |
| 82 | }; | |
| 83 | }; | |
| 84 | } | |
| 85 | }} | |
| 86 | ||
| 87 | #endif |