RE: overlaying arrays in v5r1

Thanks for the explanation Jon, I was focused on the reference to the
externally defined file definition and working within a data structure
defined that way. Recoding the array fields in a separate data structure
does remove the need for knowing field sizes and field positions in the
record.

Paul


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Jon Paris
Sent: Monday, January 20, 2014 3:42 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: Re: overlaying arrays in v5r1

But Alan didn't use LIKEREC or anything Paul so it doesn't matter. His
technique (which is what I would have used) simply forces the compiler to
allocate the storage for the fields in question in the named DS. Once there
they can be redefined as an array. This article from 2003 outlines the
technique and was written in response to almost exactly the same question as
the OP posed.
http://www.ibmsystemsmag.com/ibmi/developer/general/D-spec-Discoveries/

If there are any other fields in the record that are wanted their storage
will simply be automatically allocated as per normal.

On 2014-01-20, at 2:02 PM, paultherrien@xxxxxxxxxxxxxxxxxx wrote:

I agree with you on that, but my assumption was that the fields in
question might not be the only fields in the record format.

Paul

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Alan Campin
Sent: Monday, January 20, 2014 2:00 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: Re: overlaying arrays in v5r1

Assuming CTTA fields are coming from a file you do not need the field
sizes, only the names. The compiler will define them based on the
previous declaration of the file.

d OverCTTA ds
d CTTA01
d CTTA02
d ...
d CTTA10
d CTTAArray...
d 17s 4 Dim(10)
d Overlay OverCTTA)



On Mon, Jan 20, 2014 at 11:22 AM, <paultherrien@xxxxxxxxxxxxxxxxxx> wrote:

CTTA01 Decimal 17 4
CTTA02 Decimal 17 4
CTTA03 Decimal 17 4
...
CTTA10 Decimal 17 4

CTTALL 1 170A
CTTA OVRLAY(CTTALL) LIKE(CTTA01) DIM(10)

Define a single field to overlay the entire set of fields.
Define your array over that field.
My example assumes that CTTA01 etal are zoned. If packed, then
CTTALL length would be 90a.


Paul

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Thomas Garvey
Sent: Monday, January 20, 2014 12:57 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: overlaying arrays in v5r1

I'm drawing a blank on how to define an array over several fields in
a file record.

The file has several fields defined as...

CTTA01 Decimal 17 4
CTTA02 Decimal 17 4
CTTA03 Decimal 17 4
etc..

I THOUGHT I could just define the file on an external DS definition,
as follows...
D FileDS E DS extname(FileName)

Then, just add the array definitions using the overlay keyword, as
follows...
D CTTA overlay(CTTA01) dim(10)
like(CTTA01)


Remembering that this is on a v5r1 system, the compiler rejects it,
saying, RNF7303 Subfield defined with keyword OVERLAY is too big;
specification ignored.

How are ten elements of packed 17/4 too big for a subfield?

How must I specify this?
--

Pressing on,

Thomas Garvey



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Jon Paris

www.partner400.com
www.SystemiDeveloper.com




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