Re: Procedure PR/PI question -- RPG400-L

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On Mon, 29 Apr 2013, at 14:16:35, Rory Hewitt <rory.hewitt@xxxxxxxxx> wrote:

CONST means I will try to keep you from changing it but there are plenty of
ways to change the variable inside the procedure and have the calling
variable to be changed.

I agree that it is possible Rory, but not as easy as you are making it sound.

These include passing as a parameter to a program inside the procedure,

If the receiving program had a PI and the parm was defined as CONST this is not permitted. The compiler will not permit the programmer to pass a CONST parm in any way other that as another CONST or VALUE parm.

getting a pointer to it,

As above - not permitted.

putting in a data structure.

Nope - that would be a copy of the data.

The compiler may try to prevent you from changing but it is easy enough to
change which could result in some really nasty bugs.

The only "easy" way is if the receiving program does not have a PI defining the parm as CONST. Anything else requires more work.

Jon Paris

www.partner400.com
www.SystemiDeveloper.com

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