add original source

source/listing_4.10.cpp

@@ -0,0 +1,27 @@
+#include <future>
+void process_connections(connection_set& connections)
+{
+    while(!done(connections))
+    {
+        for(connection_iterator
+                connection=connections.begin(),end=connections.end();
+            connection!=end;
+            ++connection)
+        {
+            if(connection->has_incoming_data())
+            {
+                data_packet data=connection->incoming();
+                std::promise<payload_type>& p=
+                    connection->get_promise(data.id);
+                p.set_value(data.payload);
+            }
+            if(connection->has_outgoing_data())
+            {
+                outgoing_packet data=
+                    connection->top_of_outgoing_queue();
+                connection->send(data.payload);
+                data.promise.set_value(true);
+            }
+        }
+    }
+}