Reg Class lcl_event_receiver

Question

hi friends
class lcl_event_receiver definition deferred.
In alv sample we have this statement, what is purpose of this statement ?
Exactly what it mean in the program ?
Regards
Deva

Answer 1

This is used so you can refer to this class BEFORE you have  actually defined the class. This is particularly useful where you split a program up into a number of includes
        program A.
         include A_TOP
         include  A_CL
         include A_FORMS
      etc.
so if in the A_TOP include you refer to the class in the A_CL   you waon't get a syntax error.
for example  in A_TOP you have
include <icon>.
field-symbols: <fs>   type any,
               <fsa>,
               <fsb>.
*class lcl_event_handler definition deferred. " Event handler*
then rest of your data
data:  go_handler  type ref to lcl_event_handler,   "<==================  syntax error if the definition deferred stmt missing
etc
The class is in your include A_CL 
class lcl_event_handler definition.
* add other methods etc here at will depending on the
* application --such as new buttons on toolbars etc.
  public section.
    methods:
      handle_double_click for event double_click of cl_gui_alv_grid
    importing
           e_row
           e_column
           es_row_no
           sender,
etc etc.
cheers
jimbo