Re: Pointer Reset operation?

So what's the recommended way of "unpointing" the pointer or knowing if a
pointer has been set?

I'm checking for a null value simply by comparing the pointer with one that
is never used in the program.
myPointer *
NullPointer * inz(*null)

If myPointer <> NullPointer
myPointer = NullPointer
endif

But this doesn't seem right to me

date: Wed, 21 Jul 2021 14:31:00 -0400
from: Barbara Morris <bmorris@xxxxxxxxxx>
subject: Re: Pointer Reset operation?

On 2021-07-20 3:20 p.m., Carel via RPG400-L wrote:

Is REALLOC not an option?

I don't think it would be valid for the RPG program to use REALLOC.
Reallocating a pointer does not necessarily give the same pointer back,
and YAJL would still have a pointer to the old storage. The old storage
would not "belong" to YAJL any more, and if YAJL changed it, it could
cause storage corruption for something else now using the storage.

Same with DEALLOC. That frees the storage, and possibly sets the -local-
copy of the pointer to null, but it would not set the YAJL pointer to
null, so YAJL would still have its pointer to the storage. But again,
the storage would not "belong" to YAJL any more, so storage corruption
could occur.

--
Barbara