implicit parameter SENDER

[Former Member]

hi,

i need the explanation and sample how to apply the parameter 'sender' in abap object. why it is called implicit parameter?

thanks

[Clemenss]

Hi el,

sender is an implicit import parameter of an event handler method. It is not declared in the interface but gives the event handler a reference to the object where the event was raised.

CLASS flight_attendant DEFINITION.
  PUBLIC SECTION.
    METHODS: constructor
               IMPORTING i_id TYPE string,
             help_the_pilot FOR EVENT
               call_button_pressed OF pilot IMPORTING sender,
             help_a_passenger FOR EVENT
               call_button_pressed OF passenger
                  IMPORTING e_seatnumber sender.
  PRIVATE SECTION.
    DATA id TYPE string.
  ENDCLASS.

* Class Implementations

CLASS pilot IMPLEMENTATION.
  METHOD call_flight_attendant.
    RAISE EVENT call_button_pressed.
  ENDMETHOD.
ENDCLASS.

If the method call_flight_attendant is raised by an instance of class pilot, event call_button_pressed is raised. The event handler method help_the_pilot imports the field sender which carries a reference to the calling pilot instance.

Regards,

Clemens