1 // Boost.Signals2 library
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)
10 // For more information, see http://www.boost.org
12 #ifndef BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
13 #define BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
15 #include <boost/mpl/bool.hpp>
16 #include <boost/ref.hpp>
17 #include <boost/signals2/detail/signals_common.hpp>
18 #include <boost/signals2/slot_base.hpp>
19 #include <boost/signals2/trackable.hpp>
20 #include <boost/type_traits/is_function.hpp>
21 #include <boost/type_traits/is_pointer.hpp>
22 #include <boost/type_traits/remove_pointer.hpp>
23 #include <boost/utility/addressof.hpp>
31 // Visitor to collect tracked objects from a bound function.
32 class tracked_objects_visitor
35 tracked_objects_visitor(slot_base *slot) : slot_(slot)
38 void operator()(const T& t) const
40 m_visit_reference_wrapper(t, mpl::bool_<is_reference_wrapper<T>::value>());
44 void m_visit_reference_wrapper(const reference_wrapper<T> &t, const mpl::bool_<true> &) const
46 m_visit_pointer(t.get_pointer(), mpl::bool_<true>());
49 void m_visit_reference_wrapper(const T &t, const mpl::bool_<false> &) const
51 m_visit_pointer(t, mpl::bool_<is_pointer<T>::value>());
54 void m_visit_pointer(const T &t, const mpl::bool_<true> &) const
56 m_visit_not_function_pointer(t, mpl::bool_<!is_function<typename remove_pointer<T>::type>::value>());
59 void m_visit_pointer(const T &t, const mpl::bool_<false> &) const
61 m_visit_pointer(boost::addressof(t), mpl::bool_<true>());
64 void m_visit_not_function_pointer(const T *t, const mpl::bool_<true> &) const
66 m_visit_signal(t, mpl::bool_<is_signal<T>::value>());
69 void m_visit_not_function_pointer(const T &, const mpl::bool_<false> &) const
72 void m_visit_signal(const T *signal, const mpl::bool_<true> &) const
75 slot_->track_signal(*signal);
78 void m_visit_signal(const T &t, const mpl::bool_<false> &) const
82 void add_if_trackable(const trackable *trackable) const
85 slot_->_tracked_objects.push_back(trackable->get_weak_ptr());
87 void add_if_trackable(const void *) const {}
89 mutable slot_base * slot_;
93 } // end namespace detail
94 } // end namespace signals2
95 } // end namespace boost
97 #endif // BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP