Re: MOVEA -> EVAL

[boldt@xxxxxxxxxx]

M. wrote:
>  I was wondering about an item that you published in MC, May 2001 issue,
>p78, entitled V5R1 Enhancements to RPG IV.  In Figure 2 it states the
>opcode and suggested freeform replacement.
>
>  Next to MOVEA is says EVAL.  Has EVAL been enhanced to substitute MOVEA
>functionality?

EVAL hasn't been enhanced.  MOVEA is rather a strange beast, and can
be replaced my one of the following alternatives:

1) If you moving one array to another (MOVEA SRC TGT) such that both
   operands are arrays with the same type, format, and size of elements,
   you can just EVAL one to the other.
2) For MOVEA with one array starting at an element other than the 1st,
   or where the start index is a variable and type, format and size are
   the same, code an EVAL within a FOR loop.
3) For anything else, code overlapping data structure subfields, and
   EVAL source to target.

Not all of the suggested substitutions are necessarily easy, or exactly
semantically identical.  The free-form calc is primarily intended for
new code.

Cheers!  Hans

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

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