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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_ITERATOR_FACADE_09252006_1011) | |
8 | #define FUSION_ITERATOR_FACADE_09252006_1011 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/support/iterator_base.hpp> | |
12 | #include <boost/fusion/iterator/detail/advance.hpp> | |
13 | #include <boost/fusion/iterator/detail/distance.hpp> | |
14 | #include <boost/fusion/support/category_of.hpp> | |
15 | #include <boost/type_traits/is_same.hpp> | |
16 | #include <boost/mpl/assert.hpp> | |
17 | #include <boost/mpl/if.hpp> | |
18 | ||
19 | namespace boost { namespace fusion | |
20 | { | |
21 | struct iterator_facade_tag; | |
22 | ||
23 | template <typename Derived, typename Category> | |
24 | struct iterator_facade : iterator_base<Derived> | |
25 | { | |
26 | typedef iterator_facade_tag fusion_tag; | |
27 | typedef Derived derived_type; | |
28 | typedef Category category; | |
29 | ||
30 | // default implementation | |
31 | template <typename I1, typename I2> | |
32 | struct equal_to // default implementation | |
33 | : is_same< | |
34 | typename I1::derived_type | |
35 | , typename I2::derived_type | |
36 | > | |
37 | {}; | |
38 | ||
39 | // default implementation | |
40 | template <typename Iterator, typename N> | |
41 | struct advance : | |
42 | mpl::if_c< | |
43 | (N::value > 0) | |
44 | , advance_detail::forward<Iterator, N::value> | |
45 | , advance_detail::backward<Iterator, N::value> | |
46 | >::type | |
47 | { | |
48 | BOOST_MPL_ASSERT_NOT((traits::is_random_access<Iterator>)); | |
49 | }; | |
50 | ||
51 | // default implementation | |
52 | template <typename First, typename Last> | |
53 | struct distance : | |
54 | distance_detail::linear_distance<First, Last> | |
55 | {}; | |
56 | }; | |
57 | }} | |
58 | ||
59 | #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408 | |
60 | namespace std | |
61 | { | |
62 | template <typename Derived, typename Category> | |
63 | struct iterator_traits< ::boost::fusion::iterator_facade<Derived, Category> > | |
64 | { }; | |
65 | } | |
66 | #endif | |
67 | ||
68 | #endif |