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  2. RPG400-L
  3. November 2010

Re: What is "BASED(StructureTemplate)"

On 11/24/2010 10:05 AM, BMay@xxxxxxxxx wrote:
What is happening is, since the DS will only be used as a template for
other DS's using LikeDS(), basing the DS on an implicitly defined (null)
pointer just keeps the storage for that DS from being allocated. Since
that template DS will never actually be used, there is no reason to waste
the memory to allocate storage for it.


Just an ad and/or reminder about the TEMPLATE keyword (new in v6r1). Use TEMPLATE instead of BASED(@) or BASED(Template) or whatever. It's clear for readers of the code. And if someone accidentally tries to use the template in calculations, they get a compile time error instead of a pointer-not-set error at runtime.

TEMPLATE has an added bonus over BASED that you can code INZ for a template DS, enabling INZ(*LIKEDS) to be used on LIKEDS definitions.

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