Re: rpg400-l-digest V1 #132

["Ken Sims at SWS Nevada" <ken.sws@xxxxxxxxx>]

Hi Mark -

> Correct me if I'm wrong, but isn't each field in a DS a pointer to
an area
>in memory?  So, if I have 3 fields coming from three different files
and
>are combined in one DS, changing one field will change the value of
the DS.
> So why can't the same field be in multiple DSs?  It's just another
pointer
>to the same area in memory, right?


A subfield is not a pointer to a memory location, it's an actual chunk
of memory.  The data structure itself is a big chunk of memory and
each of the subfields are chunks of memory within the big chunk.
That's why when you change one field in a data structure it changes
the value of any fields that overlap.  And that's why you can't have
subfields in two different data structures that reference the same
location in memory.

Ken



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