Add SharedFunction to replace boost::function

modules/beast_asio/async/SharedHandler.h

@@ -45,7 +45,11 @@ class SharedHandler : public SharedObject
 {
 protected:
     typedef boost::system::error_code error_code;
+#if 0
     typedef boost::function <void(void)> invoked_type;
+#else
+    typedef SharedFunction <void(void), SharedHandlerAllocator <char> > invoked_type;
+#endif
 
     SharedHandler () noexcept { }
 
@@ -59,19 +63,19 @@ public:
     virtual void operator() (error_code const&);
     virtual void operator() (error_code const&, std::size_t);
 
-    /** Dispatch the Function on our context. */
-    /*
-    template <typename Dispatcher, typename Function>
-    void dispatch (Dispatcher& dispatcher, BOOST_ASIO_MOVE_ARG(Function) function)
-    {
-        dispatcher.dispatch (boost::bind (
-            &SharedHandler::invoke <Function>, this,
-                BOOST_ASIO_MOVE_CAST(Function)(function)));
-    }
-    */
-
     template <typename Function>
-    void invoke (BOOST_ASIO_MOVE_ARG(Function) f);
+    void invoke (BOOST_ASIO_MOVE_ARG(Function) f)
+#if 0
+        ;
+#else
+    {
+        // The allocator will hold a reference to the SharedHandler
+        // so that we can safely destroy the function object.
+        invoked_type invoked (f,
+            SharedHandlerAllocator <char> (this));
+        invoke (invoked);
+    }
+#endif
 
     virtual void  invoke (invoked_type& invoked) = 0;
     virtual void* allocate (std::size_t size) = 0;