struct event_args *	EVENT
struct bufferevent *	EVENT
const char *		T_PV

OUTPUT

EVENT
    sv_setref_pv( $arg, CLASS, (void*)$var );


INPUT

EVENT
    if( sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG) )
	    $var = ($type)SvIV((SV*)SvRV( $arg ));
    else{
	    warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
	    XSRETURN_UNDEF;
    }