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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_NEXT_IMPL_07162005_0136) | |
8 | #define FUSION_NEXT_IMPL_07162005_0136 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/iterator/next.hpp> | |
12 | #include <boost/fusion/iterator/equal_to.hpp> | |
13 | #include <boost/mpl/if.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | struct joint_view_iterator_tag; | |
18 | ||
19 | template <typename Category, typename First, typename Last, typename Concat> | |
20 | struct joint_view_iterator; | |
21 | ||
22 | namespace extension | |
23 | { | |
24 | template <typename Tag> | |
25 | struct next_impl; | |
26 | ||
27 | template <> | |
28 | struct next_impl<joint_view_iterator_tag> | |
29 | { | |
30 | template <typename Iterator> | |
31 | struct apply | |
32 | { | |
33 | typedef typename Iterator::first_type first_type; | |
34 | typedef typename Iterator::last_type last_type; | |
35 | typedef typename Iterator::concat_type concat_type; | |
36 | typedef typename Iterator::category category; | |
37 | typedef typename result_of::next<first_type>::type next_type; | |
38 | typedef result_of::equal_to<next_type, last_type> equal_to; | |
39 | ||
40 | typedef typename | |
41 | mpl::if_< | |
42 | equal_to | |
43 | , concat_type | |
44 | , joint_view_iterator<category, next_type, last_type, concat_type> | |
45 | >::type | |
46 | type; | |
47 | ||
48 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
49 | static type | |
50 | call(Iterator const& i, mpl::true_) | |
51 | { | |
52 | return i.concat; | |
53 | } | |
54 | ||
55 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
56 | static type | |
57 | call(Iterator const& i, mpl::false_) | |
58 | { | |
59 | return type(fusion::next(i.first), i.concat); | |
60 | } | |
61 | ||
62 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
63 | static type | |
64 | call(Iterator const& i) | |
65 | { | |
66 | return call(i, equal_to()); | |
67 | } | |
68 | }; | |
69 | }; | |
70 | } | |
71 | }} | |
72 | ||
73 | #endif | |
74 | ||
75 |