What is the purpose of this (?=) ?

hi friends...
I am practising the WDA programs...
in that they hav used this code
data wd_table type ref to cl_wd_table.
wd_table ?= view->get_element( 'TABLE' ).
wd_this->table_control ?= wd_table->_method_handler.
wd_this->table_control->set_key_attribute_name( 'MATNR' ).
i don't know why they used this code...
here ( ?= ) what is the purpose of this ?= ?
what is the purpose of this class cl_wd_table ?
i am not clear with all statement, can you guide me..
i am waiting for ur reply
regards
Deva

?= this is called downcast or narrow casting operator in abap.
The purpose of this is assignment between reference variables in which the static type of the target varible more specific than the static type of the source varible.
Check this link, hope it helps !
[https://help.sap.com/saphelp_nw70ehp1/helpdata/en/c3/225b5f54f411d194a60000e8353423/frameset.htm]
Radhika.

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If it is to reduce traffic by driving people away, forcing them to log on simply to read to see if there is an answer to their question, or to see if there is a question they might be able to answer, then you guys are on the right track!
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What is the purpose of this (?=) ?

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