Chris@16: // Boost.Signals library
Chris@16: 
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_SIGNALS_SLOT_HEADER
Chris@16: #define BOOST_SIGNALS_SLOT_HEADER
Chris@16: 
Chris@16: #include <boost/signals/detail/signals_common.hpp>
Chris@16: #include <boost/signals/connection.hpp>
Chris@16: #include <boost/signals/trackable.hpp>
Chris@16: #include <boost/visit_each.hpp>
Chris@16: #include <boost/shared_ptr.hpp>
Chris@16: #include <cassert>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_ABI_HEADERS
Chris@16: #  include BOOST_ABI_PREFIX
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost {
Chris@16:   namespace BOOST_SIGNALS_NAMESPACE {
Chris@16:     namespace detail {
Chris@16:       class BOOST_SIGNALS_DECL slot_base {
Chris@16:         // We would have to enumerate all of the signalN classes here as
Chris@16:         // friends to make this private (as it otherwise should be). We can't
Chris@16:         // name all of them because we don't know how many there are.
Chris@16:       public:
Chris@16:         struct data_t {
Chris@16:           std::vector<const trackable*> bound_objects;
Chris@16:           connection watch_bound_objects;
Chris@16:         };
Chris@16:         shared_ptr<data_t> get_data() const { return data; }
Chris@16: 
Chris@16:         // Get the set of bound objects
Chris@16:         std::vector<const trackable*>& get_bound_objects() const
Chris@16:         { return data->bound_objects; }
Chris@16: 
Chris@16:         // Determine if this slot is still "active", i.e., all of the bound
Chris@16:         // objects still exist
Chris@16:         bool is_active() const 
Chris@16:         { return data->watch_bound_objects.connected(); }
Chris@16: 
Chris@16:       protected:
Chris@16:         // Create a connection for this slot
Chris@16:         void create_connection();
Chris@16: 
Chris@16:         shared_ptr<data_t> data;
Chris@16: 
Chris@16:       private:
Chris@16:         static void bound_object_destructed(void*, void*) {}
Chris@16:       };
Chris@16:     } // end namespace detail
Chris@16: 
Chris@16:     // Get the slot so that it can be copied
Chris@16:     template<typename F>
Chris@16:     reference_wrapper<const F>
Chris@16:     get_invocable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::signal_tag)
Chris@16:       { return reference_wrapper<const F>(f); }
Chris@16: 
Chris@16:     template<typename F>
Chris@16:     const F&
Chris@16:     get_invocable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::reference_tag)
Chris@16:       { return f; }
Chris@16: 
Chris@16:     template<typename F>
Chris@16:     const F&
Chris@16:     get_invocable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::value_tag)
Chris@16:       { return f; }
Chris@16: 
Chris@16:     // Get the slot so that it can be inspected for trackable objects
Chris@16:     template<typename F>
Chris@16:     const F&
Chris@16:     get_inspectable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::signal_tag)
Chris@16:       { return f; }
Chris@16: 
Chris@16:     template<typename F>
Chris@16:     const F&
Chris@16:     get_inspectable_slot(const reference_wrapper<F>& f, BOOST_SIGNALS_NAMESPACE::detail::reference_tag)
Chris@16:       { return f.get(); }
Chris@16: 
Chris@16:     template<typename F>
Chris@16:     const F&
Chris@16:     get_inspectable_slot(const F& f, BOOST_SIGNALS_NAMESPACE::detail::value_tag)
Chris@16:       { return f; }
Chris@16: 
Chris@16:     // Determines the type of the slot - is it a signal, a reference to a
Chris@16:     // slot or just a normal slot.
Chris@16:     template<typename F>
Chris@16:     typename BOOST_SIGNALS_NAMESPACE::detail::get_slot_tag<F>::type
Chris@16:     tag_type(const F&)
Chris@16:     {
Chris@16:       typedef typename BOOST_SIGNALS_NAMESPACE::detail::get_slot_tag<F>::type
Chris@16:         the_tag_type;
Chris@16:       the_tag_type tag = the_tag_type();
Chris@16:       return tag;
Chris@16:     }
Chris@16: 
Chris@16:   } // end namespace BOOST_SIGNALS_NAMESPACE
Chris@16: 
Chris@16:   template<typename SlotFunction>
Chris@16:   class slot : public BOOST_SIGNALS_NAMESPACE::detail::slot_base {
Chris@16:     typedef BOOST_SIGNALS_NAMESPACE::detail::slot_base inherited;
Chris@16:     typedef typename inherited::data_t data_t;
Chris@16: 
Chris@16:   public:
Chris@16:     template<typename F>
Chris@16:     slot(const F& f) : slot_function(BOOST_SIGNALS_NAMESPACE::get_invocable_slot(f, BOOST_SIGNALS_NAMESPACE::tag_type(f)))
Chris@16:     {
Chris@16:       this->data.reset(new data_t);
Chris@16: 
Chris@16:       // Visit each of the bound objects and store them for later use
Chris@16:       // An exception thrown here will allow the basic_connection to be
Chris@16:       // destroyed when this goes out of scope, and no other connections
Chris@16:       // have been made.
Chris@16:       BOOST_SIGNALS_NAMESPACE::detail::bound_objects_visitor 
Chris@16:         do_bind(this->data->bound_objects);
Chris@16:       visit_each(do_bind, 
Chris@16:                  BOOST_SIGNALS_NAMESPACE::get_inspectable_slot
Chris@16:                    (f, BOOST_SIGNALS_NAMESPACE::tag_type(f)));
Chris@16:       create_connection();
Chris@16:     }
Chris@16: 
Chris@16: #ifdef __BORLANDC__
Chris@16:     template<typename F>
Chris@16:     slot(F* f) : slot_function(f)
Chris@16:     {
Chris@16:       this->data.reset(new data_t);
Chris@16:       create_connection();
Chris@16:     }
Chris@16: #endif // __BORLANDC__
Chris@16: 
Chris@16:     // We would have to enumerate all of the signalN classes here as friends
Chris@16:     // to make this private (as it otherwise should be). We can't name all of
Chris@16:     // them because we don't know how many there are.
Chris@16:   public:
Chris@16:     // Get the slot function to call the actual slot
Chris@16:     const SlotFunction& get_slot_function() const { return slot_function; }
Chris@16: 
Chris@16:     void release() const { data->watch_bound_objects.set_controlling(false); }
Chris@16: 
Chris@16:   private:
Chris@16:     slot(); // no default constructor
Chris@16:     slot& operator=(const slot&); // no assignment operator
Chris@16: 
Chris@16:     SlotFunction slot_function;
Chris@16:   };
Chris@16: } // end namespace boost
Chris@16: 
Chris@16: #ifdef BOOST_HAS_ABI_HEADERS
Chris@16: #  include BOOST_ABI_SUFFIX
Chris@16: #endif
Chris@16: 
Chris@16: #endif // BOOST_SIGNALS_SLOT_HEADER