projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*============================================================================= |
| 2 | Copyright (c) 2001-2011 Joel de Guzman | |
| 3 | ||
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 6 | ==============================================================================*/ | |
| 7 | #if !defined(FUSION_ADVANCE_09172005_1149) | |
| 8 | #define FUSION_ADVANCE_09172005_1149 | |
| 9 | ||
| 10 | #include <boost/fusion/support/config.hpp> | |
| 11 | #include <boost/mpl/int.hpp> | |
| 12 | #include <boost/mpl/if.hpp> | |
| 13 | #include <boost/mpl/eval_if.hpp> | |
| 14 | #include <boost/mpl/identity.hpp> | |
| 15 | #include <boost/fusion/iterator/next.hpp> | |
| 16 | #include <boost/fusion/iterator/prior.hpp> | |
| 17 | ||
| 18 | namespace boost { namespace fusion { namespace advance_detail | |
| 19 | { | |
| 20 | // Default advance implementation, perform next(i) | |
| 21 | // or prior(i) N times. | |
| 22 | ||
| 23 | template <typename Iterator, int N> | |
| 24 | struct forward; | |
| 25 | ||
| 26 | template <typename Iterator, int N> | |
| 27 | struct next_forward | |
| 28 | { | |
| 29 | typedef typename | |
| 30 | forward< | |
| 31 | typename result_of::next<Iterator>::type | |
| 32 | , N-1 | |
| 33 | >::type | |
| 34 | type; | |
| 35 | }; | |
| 36 | ||
| 37 | template <typename Iterator, int N> | |
| 38 | struct forward | |
| 39 | { | |
| 40 | typedef typename | |
| 41 | mpl::eval_if_c< | |
| 42 | (N == 0) | |
| 43 | , mpl::identity<Iterator> | |
| 44 | , next_forward<Iterator, N> | |
| 45 | >::type | |
| 46 | type; | |
| 47 | ||
| 48 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 49 | static type const& | |
| 50 | call(type const& i) | |
| 51 | { | |
| 52 | return i; | |
| 53 | } | |
| 54 | ||
| 55 | template <typename I> | |
| 56 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 57 | static type | |
| 58 | call(I const& i) | |
| 59 | { | |
| 60 | return call(fusion::next(i)); | |
| 61 | } | |
| 62 | }; | |
| 63 | ||
| 64 | template <typename Iterator, int N> | |
| 65 | struct backward; | |
| 66 | ||
| 67 | template <typename Iterator, int N> | |
| 68 | struct next_backward | |
| 69 | { | |
| 70 | typedef typename | |
| 71 | backward< | |
| 72 | typename result_of::prior<Iterator>::type | |
| 73 | , N+1 | |
| 74 | >::type | |
| 75 | type; | |
| 76 | }; | |
| 77 | ||
| 78 | template <typename Iterator, int N> | |
| 79 | struct backward | |
| 80 | { | |
| 81 | typedef typename | |
| 82 | mpl::eval_if_c< | |
| 83 | (N == 0) | |
| 84 | , mpl::identity<Iterator> | |
| 85 | , next_backward<Iterator, N> | |
| 86 | >::type | |
| 87 | type; | |
| 88 | ||
| 89 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 90 | static type const& | |
| 91 | call(type const& i) | |
| 92 | { | |
| 93 | return i; | |
| 94 | } | |
| 95 | ||
| 96 | template <typename I> | |
| 97 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
| 98 | static type | |
| 99 | call(I const& i) | |
| 100 | { | |
| 101 | return call(fusion::prior(i)); | |
| 102 | } | |
| 103 | }; | |
| 104 | ||
| 105 | }}} | |
| 106 | ||
| 107 | #endif |