RE: what is object oriented programming

["DeLong, Eric" <EDeLong@xxxxxxxxxxxxxxx>]

Steve, I really don't have an answer for you.  I don't see any of the same
abstract concepts that are traditionally ascribed to OO in RPG.
Datastructures do not describe anything beside the layout of a space of
memory; they absolutely do not define a set of methods that can be used to
manipulate the data stored there.  There's not anything at all forcing me to
use this space of memory in any specific way.  



Eric DeLong
Sally Beauty Company
MIS-Project Manager (BSG)
940-898-7863 or ext. 1863



-----Original Message-----
From: Steve Richter [mailto:srichter@xxxxxxxxxxxxx]
Sent: Tuesday, May 06, 2003 11:38 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: what is object oriented programming


-----Original Message-----
From: rpg400-l-bounces+srichter=autocoder.com@xxxxxxxxxxxx
[mailto:rpg400-l-bounces+srichter=autocoder.com@xxxxxxxxxxxx]On Behalf
Of DeLong, Eric
Sent: Tuesday, May 06, 2003 11:32 AM
To: 'RPG programming on the AS400 / iSeries'
Subject: RE: what is object oriented programming

Steve said:

>>"An rpg data struct is an object"

Eric replied:

>No. Its a buffer definition. That's all.

Eric,

Do you agree that an object is a "thing" that is accessed only thru exposed
interfaces? That no access to the internal components of the object, by
definition, is allowed?

Now if your programming manager tells you that a certain data struct can
only be accessed by using a published set of procedures, doesnt that then
make the data struct an object?

Fields in the struct can be removed, added, changed.  The struct, if you
work on a V5R2 system, can be added as a member of a larger data struct. All
these changes will not break any code that uses the struct thru the
published set of procs that you are told to use.

is such a data struct just a buffer definition?

-Steve


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