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1 | // Boost.Signals2 library |
2 | ||
3 | // Copyright Frank Mori Hess 2007-2008. | |
4 | // Copyright Timmo Stange 2007. | |
5 | // Copyright Douglas Gregor 2001-2004. Use, modification and | |
6 | // distribution is subject to the Boost Software License, Version | |
7 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
8 | // http://www.boost.org/LICENSE_1_0.txt) | |
9 | ||
10 | // For more information, see http://www.boost.org | |
11 | ||
12 | #ifndef BOOST_SIGNALS2_SLOT_BASE_HPP | |
13 | #define BOOST_SIGNALS2_SLOT_BASE_HPP | |
14 | ||
15 | #include <boost/shared_ptr.hpp> | |
16 | #include <boost/weak_ptr.hpp> | |
17 | #include <boost/signals2/detail/foreign_ptr.hpp> | |
18 | #include <boost/signals2/expired_slot.hpp> | |
19 | #include <boost/signals2/signal_base.hpp> | |
20 | #include <boost/variant/apply_visitor.hpp> | |
21 | #include <boost/variant/variant.hpp> | |
22 | #include <vector> | |
23 | ||
24 | namespace boost | |
25 | { | |
26 | namespace signals2 | |
27 | { | |
28 | namespace detail | |
29 | { | |
30 | class tracked_objects_visitor; | |
31 | class trackable_pointee; | |
32 | ||
33 | typedef boost::variant<boost::weak_ptr<trackable_pointee>, boost::weak_ptr<void>, detail::foreign_void_weak_ptr > void_weak_ptr_variant; | |
34 | typedef boost::variant<boost::shared_ptr<void>, detail::foreign_void_shared_ptr > void_shared_ptr_variant; | |
35 | class lock_weak_ptr_visitor | |
36 | { | |
37 | public: | |
38 | typedef void_shared_ptr_variant result_type; | |
39 | template<typename WeakPtr> | |
40 | result_type operator()(const WeakPtr &wp) const | |
41 | { | |
42 | return wp.lock(); | |
43 | } | |
44 | // overload to prevent incrementing use count of shared_ptr associated | |
45 | // with signals2::trackable objects | |
46 | result_type operator()(const weak_ptr<trackable_pointee> &) const | |
47 | { | |
48 | return boost::shared_ptr<void>(); | |
49 | } | |
50 | }; | |
51 | class expired_weak_ptr_visitor | |
52 | { | |
53 | public: | |
54 | typedef bool result_type; | |
55 | template<typename WeakPtr> | |
56 | bool operator()(const WeakPtr &wp) const | |
57 | { | |
58 | return wp.expired(); | |
59 | } | |
60 | }; | |
61 | } | |
62 | ||
63 | class slot_base | |
64 | { | |
65 | public: | |
66 | typedef std::vector<detail::void_weak_ptr_variant> tracked_container_type; | |
67 | typedef std::vector<detail::void_shared_ptr_variant> locked_container_type; | |
68 | ||
69 | const tracked_container_type& tracked_objects() const {return _tracked_objects;} | |
70 | #ifndef BOOST_NO_EXCEPTIONS | |
71 | locked_container_type lock() const | |
72 | { | |
73 | locked_container_type locked_objects; | |
74 | tracked_container_type::const_iterator it; | |
75 | for(it = tracked_objects().begin(); it != tracked_objects().end(); ++it) | |
76 | { | |
77 | locked_objects.push_back(apply_visitor(detail::lock_weak_ptr_visitor(), *it)); | |
78 | if(apply_visitor(detail::expired_weak_ptr_visitor(), *it)) | |
79 | { | |
80 | throw expired_slot(); | |
81 | } | |
82 | } | |
83 | return locked_objects; | |
84 | } | |
85 | #endif | |
86 | bool expired() const | |
87 | { | |
88 | tracked_container_type::const_iterator it; | |
89 | for(it = tracked_objects().begin(); it != tracked_objects().end(); ++it) | |
90 | { | |
91 | if(apply_visitor(detail::expired_weak_ptr_visitor(), *it)) return true; | |
92 | } | |
93 | return false; | |
94 | } | |
95 | protected: | |
96 | friend class detail::tracked_objects_visitor; | |
97 | ||
98 | void track_signal(const signal_base &signal) | |
99 | { | |
100 | _tracked_objects.push_back(signal.lock_pimpl()); | |
101 | } | |
102 | ||
103 | tracked_container_type _tracked_objects; | |
104 | }; | |
105 | } | |
106 | } // end namespace boost | |
107 | ||
108 | #endif // BOOST_SIGNALS2_SLOT_BASE_HPP |