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1 | // Boost.Signals2 library |
2 | ||
3 | // Copyright Frank Mori Hess 2007,2009. | |
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 | // Compatibility class to ease porting from the original | |
11 | // Boost.Signals library. However, | |
12 | // boost::signals2::trackable is NOT thread-safe. | |
13 | ||
14 | // For more information, see http://www.boost.org | |
15 | ||
16 | #ifndef BOOST_SIGNALS2_TRACKABLE_HPP | |
17 | #define BOOST_SIGNALS2_TRACKABLE_HPP | |
18 | ||
19 | #include <boost/assert.hpp> | |
20 | #include <boost/shared_ptr.hpp> | |
21 | #include <boost/weak_ptr.hpp> | |
22 | ||
23 | namespace boost { | |
24 | namespace signals2 { | |
25 | namespace detail | |
26 | { | |
27 | class tracked_objects_visitor; | |
28 | ||
29 | // trackable_pointee is used to identify the tracked shared_ptr | |
30 | // originating from the signals2::trackable class. These tracked | |
31 | // shared_ptr are special in that we shouldn't bother to | |
32 | // increment their use count during signal invocation, since | |
33 | // they don't actually control the lifetime of the | |
34 | // signals2::trackable object they are associated with. | |
35 | class trackable_pointee | |
36 | {}; | |
37 | } | |
38 | class trackable { | |
39 | protected: | |
40 | trackable(): _tracked_ptr(static_cast<detail::trackable_pointee*>(0)) {} | |
41 | trackable(const trackable &): _tracked_ptr(static_cast<detail::trackable_pointee*>(0)) {} | |
42 | trackable& operator=(const trackable &) | |
43 | { | |
44 | return *this; | |
45 | } | |
46 | ~trackable() {} | |
47 | private: | |
48 | friend class detail::tracked_objects_visitor; | |
49 | weak_ptr<detail::trackable_pointee> get_weak_ptr() const | |
50 | { | |
51 | return _tracked_ptr; | |
52 | } | |
53 | ||
54 | shared_ptr<detail::trackable_pointee> _tracked_ptr; | |
55 | }; | |
56 | } // end namespace signals2 | |
57 | } // end namespace boost | |
58 | ||
59 | #endif // BOOST_SIGNALS2_TRACKABLE_HPP |