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1 | // Boost.Signals library |
2 | ||
3 | // Copyright Douglas Gregor 2001-2004. Use, modification and | |
4 | // distribution is subject to the Boost Software License, Version | |
5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | // For more information, see http://www.boost.org | |
9 | ||
10 | #ifndef BOOST_SIGNALS_SLOT_CALL_ITERATOR | |
11 | #define BOOST_SIGNALS_SLOT_CALL_ITERATOR | |
12 | ||
13 | #include <memory> | |
14 | #include <boost/iterator/iterator_facade.hpp> | |
15 | #include <boost/smart_ptr.hpp> | |
16 | #include <boost/signals/detail/config.hpp> | |
17 | #include <boost/signals/connection.hpp> | |
18 | #include <boost/optional.hpp> | |
19 | ||
20 | #ifdef BOOST_HAS_ABI_HEADERS | |
21 | # include BOOST_ABI_PREFIX | |
22 | #endif | |
23 | ||
24 | namespace boost { | |
25 | namespace BOOST_SIGNALS_NAMESPACE { | |
26 | namespace detail { | |
27 | ||
28 | // Generates a slot call iterator. Essentially, this is an iterator that: | |
29 | // - skips over disconnected slots in the underlying list | |
30 | // - calls the connected slots when dereferenced | |
31 | // - caches the result of calling the slots | |
32 | template<typename Function, typename Iterator> | |
33 | class slot_call_iterator | |
34 | : public iterator_facade<slot_call_iterator<Function, Iterator>, | |
35 | typename Function::result_type, | |
36 | single_pass_traversal_tag, | |
37 | typename Function::result_type const&> | |
38 | { | |
39 | typedef iterator_facade<slot_call_iterator<Function, Iterator>, | |
40 | typename Function::result_type, | |
41 | single_pass_traversal_tag, | |
42 | typename Function::result_type const&> | |
43 | inherited; | |
44 | ||
45 | typedef typename Function::result_type result_type; | |
46 | ||
47 | friend class iterator_core_access; | |
48 | ||
49 | public: | |
50 | slot_call_iterator(Iterator iter_in, Iterator end_in, Function func, | |
51 | optional<result_type> &c) | |
52 | : iter(iter_in), end(end_in), f(func), cache(&c) | |
53 | { | |
54 | iter = std::find_if(iter, end, is_callable()); | |
55 | } | |
56 | ||
57 | typename inherited::reference | |
58 | dereference() const | |
59 | { | |
60 | if (!cache->is_initialized()) { | |
61 | cache->reset(f(*iter)); | |
62 | } | |
63 | ||
64 | return cache->get(); | |
65 | } | |
66 | ||
67 | void increment() | |
68 | { | |
69 | iter = std::find_if(++iter, end, is_callable()); | |
70 | cache->reset(); | |
71 | } | |
72 | ||
73 | bool equal(const slot_call_iterator& other) const | |
74 | { | |
75 | iter = std::find_if(iter, end, is_callable()); | |
76 | other.iter = std::find_if(other.iter, other.end, | |
77 | is_callable()); | |
78 | return iter == other.iter; | |
79 | } | |
80 | ||
81 | private: | |
82 | mutable Iterator iter; | |
83 | Iterator end; | |
84 | Function f; | |
85 | optional<result_type>* cache; | |
86 | }; | |
87 | } // end namespace detail | |
88 | } // end namespace BOOST_SIGNALS_NAMESPACE | |
89 | } // end namespace boost | |
90 | ||
91 | #ifdef BOOST_HAS_ABI_HEADERS | |
92 | # include BOOST_ABI_SUFFIX | |
93 | #endif | |
94 | ||
95 | #endif // BOOST_SIGNALS_SLOT_CALL_ITERATOR |