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