Re: Another ILE question : CONST vs VALUE

This post should be on RPG-L, but no you haven't actually modified a CONST param.

The global variable passed in as a CONST (Reference) was modified.

This is what's know as a "side-effect". Side-effects are usually considered very, very bad things as
they are an excellent source of hard to debug errors later in the maintenance cycle.

The global nature of RPG file fields means that you must treat file I/O carefully; the same as you
would the use of other global variables.

One feature that helps considerably is using EXTFILE/LIKEREC data structures for I/O to files. Those
structures can be local to a procedure.

Charles

-----Original Message-----
From: wdsci-l-bounces+wiltc=cintas.com@xxxxxxxxxxxx
[mailto:wdsci-l-bounces+wiltc=cintas.com@xxxxxxxxxxxx] On
Behalf Of David FOXWELL
Sent: Thursday, November 15, 2007 8:34 AM
To: Websphere Development Studio Client for iSeries
Subject: Re: [WDSCI-L] Another ILE question : CONST vs VALUE

6 months later I've found an example to reply to Bob"s
question and maybe someone can tell me what's happening.

I have my code like this :


READ MyFile
Proc1 ( DREFNO ) // DREFNO is a field in MyFile


Proc1 B
SRefNo LIKE(aField) CONST

/Free

READ MyFile // The same file

// SRefNo now has the same value as DREFNO from myFile and I
have modified a parameter with CONST!


/end-free

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