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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_SIGNAL_BASE_HEADER | |
11 | #define BOOST_SIGNALS_SIGNAL_BASE_HEADER | |
12 | ||
13 | #include <boost/signals/detail/config.hpp> | |
14 | #include <boost/signals/detail/signals_common.hpp> | |
15 | #include <boost/signals/detail/named_slot_map.hpp> | |
16 | #include <boost/signals/connection.hpp> | |
17 | #include <boost/signals/trackable.hpp> | |
18 | #include <boost/signals/slot.hpp> | |
19 | #include <boost/smart_ptr.hpp> | |
20 | #include <boost/noncopyable.hpp> | |
21 | #include <boost/function/function2.hpp> | |
22 | #include <utility> | |
23 | #include <vector> | |
24 | ||
25 | #ifdef BOOST_HAS_ABI_HEADERS | |
26 | # include BOOST_ABI_PREFIX | |
27 | #endif | |
28 | ||
29 | namespace boost { | |
30 | namespace BOOST_SIGNALS_NAMESPACE { | |
31 | namespace detail { | |
32 | // Must be constructed before calling the slots, because it safely | |
33 | // manages call depth | |
34 | class BOOST_SIGNALS_DECL call_notification { | |
35 | public: | |
36 | call_notification(const shared_ptr<signal_base_impl>&); | |
37 | ~call_notification(); | |
38 | ||
39 | shared_ptr<signal_base_impl> impl; | |
40 | }; | |
41 | ||
42 | // Implementation of base class for all signals. It handles the | |
43 | // management of the underlying slot lists. | |
44 | class BOOST_SIGNALS_DECL signal_base_impl { | |
45 | public: | |
46 | friend class call_notification; | |
47 | ||
48 | typedef function2<bool, stored_group, stored_group> compare_type; | |
49 | ||
50 | // Make sure that an exception does not cause the "clearing" flag to | |
51 | // remain set | |
52 | class temporarily_set_clearing { | |
53 | public: | |
54 | temporarily_set_clearing(signal_base_impl* b) : base(b) | |
55 | { | |
56 | base->flags.clearing = true; | |
57 | } | |
58 | ||
59 | ~temporarily_set_clearing() | |
60 | { | |
61 | base->flags.clearing = false; | |
62 | } | |
63 | ||
64 | private: | |
65 | signal_base_impl* base; | |
66 | }; | |
67 | ||
68 | friend class temporarily_set_clearing; | |
69 | ||
70 | signal_base_impl(const compare_type&, const any&); | |
71 | ~signal_base_impl(); | |
72 | ||
73 | // Disconnect all slots connected to this signal | |
74 | void disconnect_all_slots(); | |
75 | ||
76 | // Are there any connected slots? | |
77 | bool empty() const; | |
78 | ||
79 | // The number of connected slots | |
80 | std::size_t num_slots() const; | |
81 | ||
82 | // Disconnect all slots in the given group | |
83 | void disconnect(const stored_group&); | |
84 | ||
85 | // We're being notified that a slot has disconnected | |
86 | static void slot_disconnected(void* obj, void* data); | |
87 | ||
88 | connection connect_slot(const any& slot, | |
89 | const stored_group& name, | |
90 | shared_ptr<slot_base::data_t> data, | |
91 | connect_position at); | |
92 | ||
93 | private: | |
94 | // Remove all of the slots that have been marked "disconnected" | |
95 | void remove_disconnected_slots() const; | |
96 | ||
97 | public: | |
98 | // Our call depth when invoking slots (> 1 when we have a loop) | |
99 | mutable int call_depth; | |
100 | ||
101 | struct { | |
102 | // True if some slots have disconnected, but we were not able to | |
103 | // remove them from the list of slots because there are valid | |
104 | // iterators into the slot list | |
105 | mutable bool delayed_disconnect:1; | |
106 | ||
107 | // True if we are disconnecting all disconnected slots | |
108 | bool clearing:1; | |
109 | } flags; | |
110 | ||
111 | // Slots | |
112 | mutable named_slot_map slots_; | |
113 | any combiner_; | |
114 | ||
115 | // Types | |
116 | typedef named_slot_map::iterator iterator; | |
117 | }; | |
118 | ||
119 | class BOOST_SIGNALS_DECL signal_base : public noncopyable { | |
120 | public: | |
121 | typedef signal_base_impl::compare_type compare_type; | |
122 | ||
123 | friend class call_notification; | |
124 | ||
125 | signal_base(const compare_type& comp, const any& combiner); | |
126 | ~signal_base(); | |
127 | ||
128 | public: | |
129 | // Disconnect all slots connected to this signal | |
130 | void disconnect_all_slots() { impl->disconnect_all_slots(); } | |
131 | ||
132 | // Are there any connected slots? | |
133 | bool empty() const { return impl->empty(); } | |
134 | ||
135 | // How many slots are connected? | |
136 | std::size_t num_slots() const { return impl->num_slots(); } | |
137 | ||
138 | protected: | |
139 | connection connect_slot(const any& slot, | |
140 | const stored_group& name, | |
141 | shared_ptr<slot_base::data_t> data, | |
142 | connect_position at) | |
143 | { | |
144 | return impl->connect_slot(slot, name, data, at); | |
145 | } | |
146 | ||
147 | typedef named_slot_map::iterator iterator; | |
148 | ||
149 | shared_ptr<signal_base_impl> impl; | |
150 | }; | |
151 | } // end namespace detail | |
152 | } // end namespace BOOST_SIGNALS_NAMESPACE | |
153 | } // end namespace boost | |
154 | ||
155 | #ifdef BOOST_HAS_ABI_HEADERS | |
156 | # include BOOST_ABI_SUFFIX | |
157 | #endif | |
158 | ||
159 | #endif // BOOST_SIGNALS_SIGNAL_BASE_HEADER |