Re: Externally-Described Field used as array name.

Let me see if I got this straight. In my original example PdLb02 overlays
an array variable and is thereby recognized as an array itself. And
externally described fields can not be defined as an array. In the example
below PdLb02 overlays a field and it's definition is implicitly derived
from the externally described file which makes everything happy.
Therefore, memory addressing didn't  have didilly to do with it.

Patrick Conner
www.ConnecTown.com
(828) 244-0822



                    "Joep Beckeringh"
                    <joep@beckeringh.        To:     <rpg400-l@midrange.com>
                    myweb.nl>                cc:
                    Sent by:                 Subject:     Re: 
Externally-Described Field used as array name.
                    rpg400-l-admin@mi
                    drange.com


                    08/23/00 06:17 PM
                    Please respond to
                    rpg400-l






Patrick,

When you overlay an array, the result is automatically an array as well.
What you can do is this:

D                 ds
DPdLb_fld
DPdLb01                               Overlay(PdLb_fld:*NEXT)
DPdLb02                               Overlay(PdLb_fld:*NEXT)
DPdLb03                               Overlay(PdLb_fld:*NEXT)
DPdLb                                 Like(PdLb01) Overlay(PdLb_fld) Dim(3)

You create a dummy field that contains the array (I think the compiler
calculates the length for you).  You make the individual fields overlay the
dummy field; you don't have to supply the definition if they are defined
elsewhere (externally described file); by using *NEXT you don't have to
worry about the positions either.  Lastly you create an array that overlays
the dummy field (and thus the individual fields) by not specifying *NEXT or
a position (or by specifying ':1').

Joep Beckeringh


----- Original Message -----
From: <PatrickConner@parkdalemills.com>
To: <rpg400-l@midrange.com>
Sent: Thursday, August 23, 2001 10:06 PM
Subject: Externally-Described Field used as array name.


> D                 ds
> DPdLb                                 Like(PdLb01) Dim(3)
> DPdLb01                               Overlay(PdLb)
> DPdLb02                               Overlay(PdLb:8)
> DPdLb03                               Overlay(PdLb:15)
>
>
>    932=I                             S   60   66 0WK1AVL
>    933=I                             S   67   73 0PDLB02
> ======>                                           aaaaaaaaaaaaaa
> *RNF4138 30 a      000016  Externally-Described Field used as array name.
> Definition
>                            specification is ignored.
>    934=I                             S   74   80 0WK2SHP
>
>
> Why?
>
> I think I understand that it is a memory address thing, but I'd like an
> clear explanation.
>
> Patrick Conner
> www.ConnecTown.com
> (828) 244-0822



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