Chris@16: // Boost.Signals2 library
Chris@16: 
Chris@16: // Copyright Frank Mori Hess 2007-2008.
Chris@16: // Copyright Timmo Stange 2007.
Chris@16: // Copyright Douglas Gregor 2001-2004. Use, modification and
Chris@16: // distribution is subject to the Boost Software License, Version
Chris@16: // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: // For more information, see http://www.boost.org
Chris@16: 
Chris@16: #ifndef BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
Chris@16: #define BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
Chris@16: 
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/ref.hpp>
Chris@16: #include <boost/signals2/detail/signals_common.hpp>
Chris@16: #include <boost/signals2/slot_base.hpp>
Chris@16: #include <boost/signals2/trackable.hpp>
Chris@16: #include <boost/type_traits/is_function.hpp>
Chris@16: #include <boost/type_traits/is_pointer.hpp>
Chris@16: #include <boost/type_traits/remove_pointer.hpp>
Chris@16: #include <boost/utility/addressof.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:   namespace signals2
Chris@16:   {
Chris@16:     namespace detail
Chris@16:     {
Chris@16:       // Visitor to collect tracked objects from a bound function.
Chris@16:       class tracked_objects_visitor
Chris@16:       {
Chris@16:       public:
Chris@16:         tracked_objects_visitor(slot_base *slot) : slot_(slot)
Chris@16:         {}
Chris@16:         template<typename T>
Chris@16:         void operator()(const T& t) const
Chris@16:         {
Chris@16:             m_visit_reference_wrapper(t, mpl::bool_<is_reference_wrapper<T>::value>());
Chris@16:         }
Chris@16:       private:
Chris@16:         template<typename T>
Chris@16:         void m_visit_reference_wrapper(const reference_wrapper<T> &t, const mpl::bool_<true> &) const
Chris@16:         {
Chris@16:             m_visit_pointer(t.get_pointer(), mpl::bool_<true>());
Chris@16:         }
Chris@16:         template<typename T>
Chris@16:         void m_visit_reference_wrapper(const T &t, const mpl::bool_<false> &) const
Chris@16:         {
Chris@16:             m_visit_pointer(t, mpl::bool_<is_pointer<T>::value>());
Chris@16:         }
Chris@16:         template<typename T>
Chris@16:         void m_visit_pointer(const T &t, const mpl::bool_<true> &) const
Chris@16:         {
Chris@16:             m_visit_not_function_pointer(t, mpl::bool_<!is_function<typename remove_pointer<T>::type>::value>());
Chris@16:         }
Chris@16:         template<typename T>
Chris@16:         void m_visit_pointer(const T &t, const mpl::bool_<false> &) const
Chris@16:         {
Chris@16:             m_visit_pointer(boost::addressof(t), mpl::bool_<true>());
Chris@16:         }
Chris@16:         template<typename T>
Chris@16:         void m_visit_not_function_pointer(const T *t, const mpl::bool_<true> &) const
Chris@16:         {
Chris@16:             m_visit_signal(t, mpl::bool_<is_signal<T>::value>());
Chris@16:         }
Chris@16:         template<typename T>
Chris@16:         void m_visit_not_function_pointer(const T &, const mpl::bool_<false> &) const
Chris@16:         {}
Chris@16:         template<typename T>
Chris@16:         void m_visit_signal(const T *signal, const mpl::bool_<true> &) const
Chris@16:         {
Chris@16:           if(signal)
Chris@16:             slot_->track_signal(*signal);
Chris@16:         }
Chris@16:         template<typename T>
Chris@16:         void m_visit_signal(const T &t, const mpl::bool_<false> &) const
Chris@16:         {
Chris@16:             add_if_trackable(t);
Chris@16:         }
Chris@16:         void add_if_trackable(const trackable *trackable) const
Chris@16:         {
Chris@16:           if(trackable)
Chris@101:             slot_->_tracked_objects.push_back(trackable->get_weak_ptr());
Chris@16:         }
Chris@16:         void add_if_trackable(const void *) const {}
Chris@16: 
Chris@16:         mutable slot_base * slot_;
Chris@16:       };
Chris@16: 
Chris@16: 
Chris@16:     } // end namespace detail
Chris@16:   } // end namespace signals2
Chris@16: } // end namespace boost
Chris@16: 
Chris@16: #endif // BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
Chris@16: