// Boost.Signals library // 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_SIGNALS_SLOT_HEADER #define BOOST_SIGNALS_SLOT_HEADER #include <boost/signals/detail/signals_common.hpp> #include <boost/signals/connection.hpp> #include <boost/signals/trackable.hpp> #include <boost/visit_each.hpp> #include <boost/shared_ptr.hpp> #include <cassert> #ifdef BOOST_HAS_ABI_HEADERS # include BOOST_ABI_PREFIX #endif namespace boost { namespace BOOST_SIGNALS_NAMESPACE { namespace detail { class BOOST_SIGNALS_DECL slot_base { // We would have to enumerate all of the signalN classes here as // friends to make this private (as it otherwise should be). We can't // name all of them because we don't know how many there are. public: struct data_t { std::vector<const trackable*> bound_objects; connection watch_bound_objects; }; shared_ptr<data_t> get_data() const { return data; } // Get the set of bound objects std::vector<const trackable*>& get_bound_objects() const { return data->bound_objects; } // Determine if this slot is still "active", i.e., all of the bound // objects still exist bool is_active() const { return data->watch_bound_objects.connected(); } protected: // Create a connection for this slot void create_connection(); shared_ptr<data_t> data; private: static void bound_object_destructed(void*, void*) {} }; } // end namespace detail // Get the slot so that it can be copied template<typename F> reference_wrapper<const F> get_invocable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::signal_tag) { return reference_wrapper<const F>(f); } template<typename F> const F& get_invocable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::reference_tag) { return f; } template<typename F> const F& get_invocable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::value_tag) { return f; } // Get the slot so that it can be inspected for trackable objects template<typename F> const F& get_inspectable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::signal_tag) { return f; } template<typename F> const F& get_inspectable_slot(const reference_wrapper<F>& f, BOOST_SIGNALS_NAMESPACE::detail::reference_tag) { return f.get(); } template<typename F> const F& get_inspectable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::value_tag) { return f; } // Determines the type of the slot - is it a signal, a reference to a // slot or just a normal slot. template<typename F> typename BOOST_SIGNALS_NAMESPACE::detail::get_slot_tag<F>::type tag_type(const F&) { typedef typename BOOST_SIGNALS_NAMESPACE::detail::get_slot_tag<F>::type the_tag_type; the_tag_type tag = the_tag_type(); return tag; } } // end namespace BOOST_SIGNALS_NAMESPACE template<typename SlotFunction> class slot : public BOOST_SIGNALS_NAMESPACE::detail::slot_base { typedef BOOST_SIGNALS_NAMESPACE::detail::slot_base inherited; typedef typename inherited::data_t data_t; public: template<typename F> slot(const F& f) : slot_function(BOOST_SIGNALS_NAMESPACE::get_invocable_slot(f, BOOST_SIGNALS_NAMESPACE::tag_type(f))) { this->data.reset(new data_t); // Visit each of the bound objects and store them for later use // An exception thrown here will allow the basic_connection to be // destroyed when this goes out of scope, and no other connections // have been made. BOOST_SIGNALS_NAMESPACE::detail::bound_objects_visitor do_bind(this->data->bound_objects); visit_each(do_bind, BOOST_SIGNALS_NAMESPACE::get_inspectable_slot (f, BOOST_SIGNALS_NAMESPACE::tag_type(f))); create_connection(); } #ifdef __BORLANDC__ template<typename F> slot(F* f) : slot_function(f) { this->data.reset(new data_t); create_connection(); } #endif // __BORLANDC__ // We would have to enumerate all of the signalN classes here as friends // to make this private (as it otherwise should be). We can't name all of // them because we don't know how many there are. public: // Get the slot function to call the actual slot const SlotFunction& get_slot_function() const { return slot_function; } void release() const { data->watch_bound_objects.set_controlling(false); } private: slot(); // no default constructor slot& operator=(const slot&); // no assignment operator SlotFunction slot_function; }; } // end namespace boost #ifdef BOOST_HAS_ABI_HEADERS # include BOOST_ABI_SUFFIX #endif #endif // BOOST_SIGNALS_SLOT_HEADER