Re: Variable length MODS

[boldt@xxxxxxxxxx]

Jim wrote:
> or any way you want to do it.  Interesting, how do you do elemets
>with dimentioned data structures? Time to hit the manual

Lookup the keyword OCCURS.  (DIM on data structure definition was
one of the items that came out in the first $100 in the 2001 RPG
enhancement survery, so who knows?  You may well see it in the
language within the next few decades.)

>The whole point being, RPG or the AS/400 shouldn't care what the
>upper limit is. It does not have to allocate any memory, since we
>are using a pointer anyway, and just looking at memory that's already
>there.  The program math is fairly simple behind the covers, the
>array element X starts at SizeOfStructure * (X - 1) + 1

Of course, that's one possible design.  We could allow DIM(*) for a
based array or data structure and forget about generating code to
check the upper bound.  That's not unreasonable.  We just have a
bunch of other things to look at first before we get around to
dynamic arrays.  But certainly if there's something easy we can do
in the meantime to make things easier, we will consider it.

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com

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