RE: Passing Multi-Occurence Data Structures -- RPG400-L

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Thanks for the help on this occasion and for all the other little tips and
pieces of guidance that I've read over the past few months.

Mark

> -----Original Message-----
> From: Ken Sims [SMTP:mr2087@ke9nr.net]
> Sent: Wednesday, December 04, 2002 9:56 PM
> To:   rpg400-l@midrange.com
> Subject:      RE: Passing Multi-Occurence Data Structures
>
> Hi Buck, et.al. -
>
> >It's an interesting design question.  If you pass a pointer to a global
> >MODS, then in reality you can simply omit the pointer and have the
> >subprocedure directly manipulate the MODS.  On the other hand, having a
> >pointer in the parameter list shows your intent to use the data structure
> in
> >the subprocedure.  I think I would pass the pointer.
>
> I agree with passing the pointer and using a local MODS based on that
> pointer.  Among other things, it allows the procedure to be put into a
> service program or different module without requiring any changes, as long
> as everything else in the procedure also is passed.
>
> The one gotcha to watch for: %addr(MODS) passes a pointer to the CURRENT
> occurrence of the MODS.  So if the procedure wants to use all of the
> occurrences in the MODS, rather than just one, you need to set the current
> occurrence to the first occurrence before calling the procedure.  Another
> option would be to initialize a pointer to the beginning of the MODS and
> just pass that pointer all of the time instead of using %ADDR.
>
> (Can you guess how I know about this?  <G>)
>
> Ken
> Opinions expressed are my own and do not necessarily represent the views
> of
> my employer or anyone in their right mind.
>
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