Re: CONST parameter changed?

He may be talking about an external call. External calls don't allow
VALUE.




From: Charles Wilt <charles.wilt@xxxxxxxxx>
To: "Rational Developer for IBM i / Websphere Development Studio
Client for System i & iSeries" <wdsci-l@xxxxxxxxxxxx>
Date: 02/20/2014 11:01 AM
Subject: Re: [WDSCI-L] CONST parameter changed?
Sent by: wdsci-l-bounces@xxxxxxxxxxxx



Jon,

How would the end result be any different than using VALUE? Since VALUE
always creates a copy?

Unless there's some limitation to passing by value I'm not immediate aware
of?

Charles


On Thu, Feb 20, 2014 at 10:01 AM, Jon Paris
<jon.paris@xxxxxxxxxxxxxx>wrote:

CONST will not cause a copy of the passed variable to be made unless

there

is a data type/size mis-match. Consequently, since you have no such
mismatch, the parameter passed is the pointer to the real atrval

variable.

Since that is global the rester will indeed cause it to change value.

So - Yes - it is perfectly normal. Unfortunate but normal.

I have long wanted to have a version of const that operates in similar
fashion to COBOL's "BY COPY". That causes a copy of the data to be passed
regardless - even when there is no type/size mismatch. I believe this
capability is on the RPG wish list, but just hasn't risen to the top yet.


On 2014-02-20, at 8:07 AM, "Colpaert, Peter" <Peter.Colpaert@xxxxxxxxxxx>
wrote:

Hi group,

I encountered a strange issue today when coding a procedure.

In my main procedure, I call a subprocedure:

WriteAttribute(o_pdmnbr19:
o_vernbr19:
*blanks:
atride94:
atrval20);

In my WriteAttribute procedure, I have the following interface:

Dcl-proc WriteAttribute;

Dcl-pi *n;
pdmnbr_p like(pdmnbr20) const;
vernbr_p like(vernbr20) const;
colint_p like(colint53) const;
atride_p like(atride20) const;
atrval_p like(atrval20) const;
End-Pi;


At one point in the subprocedure, I do a reset of the record format

containing - among other fields - ATRVAL20.

As soon as I do this Reset, the atrval_p field goes blank also.

Is this normal behaviour or am I doing something wrong?

I thought that the CONST keyword indicated that your parameter could

not

be changed...

Met vriendelijke groeten / Best regards,

Peter Colpaert
Software Engineer - PLM Development Team
IT Operations Cluster Benelux, Philips IT

Philips Consumer Luminaires
Industrieterrein Satenrozen 11, 2550 Kontich, Belgium
Tel: (+32) 3/459 13 17
Email: Peter.Colpaert@xxxxxxxxxxx<mailto:Peter.Colpaert@xxxxxxxxxxx>

Working from home on Wednesdays


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