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 | // silence MSVC warning C4512: assignment operator could not be generated |
46 | BOOST_DELETED_FUNCTION(cons_iterator& operator= (cons_iterator const&)) |
47 | }; |
48 | |
49 | struct nil_iterator : iterator_base<nil_iterator> |
50 | { |
51 | typedef forward_traversal_tag category; |
52 | typedef cons_iterator_tag fusion_tag; |
53 | typedef nil_ cons_type; |
54 | typedef cons_iterator_identity< |
55 | add_const<nil_>::type> |
56 | identity; |
57 | |
58 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
59 | nil_iterator() BOOST_NOEXCEPT {} |
60 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
61 | explicit nil_iterator(nil_ const&) BOOST_NOEXCEPT {} |
62 | }; |
63 | |
64 | template <> |
65 | struct cons_iterator<nil_> : nil_iterator |
66 | { |
67 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
68 | cons_iterator() BOOST_NOEXCEPT {} |
69 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
70 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} |
71 | }; |
72 | |
73 | template <> |
74 | struct cons_iterator<nil_ const> : nil_iterator |
75 | { |
76 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
77 | cons_iterator() BOOST_NOEXCEPT {} |
78 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
79 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} |
80 | }; |
81 | |
82 | template <> |
83 | struct cons_iterator<list<> > : nil_iterator |
84 | { |
85 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
86 | cons_iterator() BOOST_NOEXCEPT {} |
87 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
88 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} |
89 | }; |
90 | |
91 | template <> |
92 | struct cons_iterator<list<> const> : nil_iterator |
93 | { |
94 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
95 | cons_iterator() BOOST_NOEXCEPT {} |
96 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
97 | explicit cons_iterator(nil_ const&) BOOST_NOEXCEPT {} |
98 | }; |
99 | }} |
100 | |
101 | #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408 |
102 | namespace std |
103 | { |
104 | template <typename Cons> |
105 | struct iterator_traits< ::boost::fusion::cons_iterator<Cons> > |
106 | { }; |
107 | } |
108 | #endif |
109 | |
110 | #endif |
111 |