Hi.  I want to have a variation on the chat server/client model in that there's a language with instructions being sent. Both the server and the client need to parse this language.  When the server changes something, it sends the change in the language to all clients.  When the client changes something it sends the change to the server which in turn resends it to all clients but, here's the catch, not to the one that sent the change in the first place. I managed the removal of the client by doing:    ParserList::const_iterator i = clients.begin();    ParserList::const_iterator e = clients.end();    for ( ; i != e; ++i )    {        try        {             if ( !(*i)->socket_.is_open() ) continue;            std::string p = boost::lexical_cast<std::string>( (*i)->socket_.remote_endpoint() );            if ( p == id )                continue;            (*i)->deliver( cmd );        }        catch( const std::exception& e )        {            LOG_CONN( "Parser::write " << e.what() );        }        catch( ... )        {            LOG_CONN( "Parser::write unhandled exception" );        }    } } I managed to create a working version of the above also by modifying the asio async example using multiple inheritance for the parser  (which both the client and the tcp_session inherit). However I am unhappy with this.  I ask here to see if someone can suggest a more simple approach to this. -- Gonzalo Garramuño