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Home » MIDRANGE-L » May 1999

RE: Basing Pointers



fixed

Let me put it another way. A based data structure defines the data
structure elements as having addresses that are offsets from the current
address of the based pointer. 
No flames on the multi-occurrence data structures David, you're
essentially correct. A multi occurrence data structure defines an array
of x elements where each element has the structures' defined length. The
DS subfields are defined based on a pointer. When you do an OCUR it sets
the pointer to the relevant array element. 

> -----Original Message-----
> From: david.kahn@gb.abb.com [SMTP:david.kahn@gb.abb.com]
> Sent: Wednesday, May 19, 1999 7:26 AM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: Basing Pointers
> 
> 
> 
> leif@ibm.net wrote:
> 
> >could someone define for me what 'basing pointers' might mean then?
> 
> A basing pointer holds the address of a based data structure or
> standalone
> field. By changing the address stored in the pointer the based data
> structure
> can be relocated within the program's storage. This makes it both
> simpler and
> more efficient to process lists of data in storage.
> 
> I believe the old multiple occurrence data structure works in a
> similar way -
> shoot me down in flames someone if I'm wrong. :-)
> 
> Dave Kahn, ABB Steward Ltd.
> 
> 
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