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1 | /*============================================================================= | |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2005 Eric Niebler | |
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_CONS_ITERATOR_07172005_0849) | |
9 | #define FUSION_CONS_ITERATOR_07172005_0849 | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/type_traits/add_const.hpp> | |
13 | #include <boost/fusion/support/iterator_base.hpp> | |
14 | #include <boost/fusion/container/list/detail/deref_impl.hpp> | |
15 | #include <boost/fusion/container/list/detail/next_impl.hpp> | |
16 | #include <boost/fusion/container/list/detail/value_of_impl.hpp> | |
17 | #include <boost/fusion/container/list/detail/equal_to_impl.hpp> | |
18 | #include <boost/fusion/container/list/list_fwd.hpp> | |
19 | ||
20 | namespace boost { namespace fusion | |
21 | { | |
22 | struct nil_; | |
23 | struct cons_iterator_tag; | |
24 | struct forward_traversal_tag; | |
25 | ||
26 | template <typename Cons> | |
27 | struct cons_iterator_identity; | |
28 | ||
29 | template <typename Cons = nil_> | |
30 | struct cons_iterator : iterator_base<cons_iterator<Cons> > | |
31 | { | |
32 | typedef cons_iterator_tag fusion_tag; | |
33 | typedef forward_traversal_tag category; | |
34 | typedef Cons cons_type; | |
35 | typedef cons_iterator_identity< | |
36 | typename add_const<Cons>::type> | |
37 | identity; | |
38 | ||
39 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
40 | explicit cons_iterator(cons_type& in_cons) BOOST_NOEXCEPT | |
41 | : cons(in_cons) {} | |
42 | ||
43 | cons_type& cons; | |
44 | ||
45 | private: | |
46 | // silence MSVC warning C4512: assignment operator could not be generated | |
47 | cons_iterator& operator= (cons_iterator const&); | |
48 | }; | |
49 | ||
50 | struct nil_iterator : iterator_base<nil_iterator> | |
51 | { | |
52 | typedef forward_traversal_tag category; | |
53 | typedef cons_iterator_tag fusion_tag; | |
54 | typedef nil_ cons_type; | |
55 | typedef cons_iterator_identity< | |
56 | add_const<nil_>::type> | |
57 | identity; | |
58 | ||
59 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
60 | nil_iterator() BOOST_NOEXCEPT {} | |
61 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
62 | explicit nil_iterator(nil_ const&) BOOST_NOEXCEPT {} | |
63 | }; | |
64 | ||
65 | template <> | |
66 | struct cons_iterator<nil_> : nil_iterator | |
67 | { | |
68 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
69 | cons_iterator() BOOST_NOEXCEPT {} | |
70 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
71 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} | |
72 | }; | |
73 | ||
74 | template <> | |
75 | struct cons_iterator<nil_ const> : nil_iterator | |
76 | { | |
77 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
78 | cons_iterator() BOOST_NOEXCEPT {} | |
79 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
80 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} | |
81 | }; | |
82 | ||
83 | template <> | |
84 | struct cons_iterator<list<> > : nil_iterator | |
85 | { | |
86 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
87 | cons_iterator() BOOST_NOEXCEPT {} | |
88 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
89 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} | |
90 | }; | |
91 | ||
92 | template <> | |
93 | struct cons_iterator<list<> const> : nil_iterator | |
94 | { | |
95 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
96 | cons_iterator() BOOST_NOEXCEPT {} | |
97 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
98 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} | |
99 | }; | |
100 | }} | |
101 | ||
102 | #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408 | |
103 | namespace std | |
104 | { | |
105 | template <typename Cons> | |
106 | struct iterator_traits< ::boost::fusion::cons_iterator<Cons> > | |
107 | { }; | |
108 | } | |
109 | #endif | |
110 | ||
111 | #endif |