]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | // Boost.Signals2 library |
2 | ||
3 | // Copyright Frank Mori Hess 2007-2008. | |
4 | // Use, modification and | |
5 | // distribution is subject to the Boost Software License, Version | |
6 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | // For more information, see http://www.boost.org | |
10 | ||
11 | #ifndef BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP | |
12 | #define BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP | |
13 | ||
14 | #include <boost/shared_ptr.hpp> | |
15 | #include <boost/signals2/connection.hpp> | |
16 | #include <boost/weak_ptr.hpp> | |
17 | ||
18 | namespace boost | |
19 | { | |
20 | namespace signals2 | |
21 | { | |
22 | class shared_connection_block | |
23 | { | |
24 | public: | |
25 | shared_connection_block(const signals2::connection &conn = signals2::connection(), | |
26 | bool initially_blocked = true): | |
27 | _weak_connection_body(conn._weak_connection_body) | |
28 | { | |
29 | if(initially_blocked) block(); | |
30 | } | |
31 | void block() | |
32 | { | |
33 | if(blocking()) return; | |
34 | boost::shared_ptr<detail::connection_body_base> connection_body(_weak_connection_body.lock()); | |
35 | if(connection_body == 0) | |
36 | { | |
37 | // Make _blocker non-empty so the blocking() method still returns the correct value | |
38 | // after the connection has expired. | |
39 | _blocker.reset(static_cast<int*>(0)); | |
40 | return; | |
41 | } | |
42 | _blocker = connection_body->get_blocker(); | |
43 | } | |
44 | void unblock() | |
45 | { | |
46 | _blocker.reset(); | |
47 | } | |
48 | bool blocking() const | |
49 | { | |
50 | shared_ptr<void> empty; | |
51 | return _blocker < empty || empty < _blocker; | |
52 | } | |
53 | signals2::connection connection() const | |
54 | { | |
55 | return signals2::connection(_weak_connection_body); | |
56 | } | |
57 | private: | |
58 | boost::weak_ptr<detail::connection_body_base> _weak_connection_body; | |
59 | shared_ptr<void> _blocker; | |
60 | }; | |
61 | } | |
62 | } // end namespace boost | |
63 | ||
64 | #endif // BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP |