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Hi Scott,
<Scott wrote>
No. Variables that are local to a subprocedure can only be accessed from
that subprocedure (unless passed as a parm to something else, referenced by
a global pointer, etc)
So you need to add a "mode" parm to SimpleProc() or use a global variable.
</Scott wrote>
This is what I thought, and is the documented position of IBM. I was hoping
that there was a neat trick that'd do the job.
<Scott then wrote>
Sometimes you want to retain the value of something, but then have it get
reset each time you call the subprocedure. For example, if you created a
data structure in a subprocedure and returned a pointer to it. You might
reset the contents of that data structure at the start of the subproc every
time it's called -- and therefore don't need to be able to initialize it
somewhere else. A static variable would work for that (It's not the way I'd
do it, but it would work.)
</Scott then wrote>
This may well be the neat trick!
I can see now that the obvious benefit of static procedure variables is the
ability to pass a static reference to other static variables when returning
a call. This would usually be disasterous as all automatic storage is
vulnerable to the system reclaiming it once the call has returned. Static
storage does not have this problem.
So you could call a subprocedure that performs some action and returns a
pointer to some internal static storage. This could be the derived address
of a procptr , not just a data pointer! It could even be a pointer to a ds
of pointers!
Hmmm...
Another possibility for experimentation to add to the ever-growing list. :-)
Cheers
Larry Ducie
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