[fpc-pascal] Empty record inside another record ?
daniel.mantione at freepascal.org
Sat Feb 16 17:24:00 CET 2008
Op Fri, 15 Feb 2008, schreef Skybuck Flying:
> To me it seems like some kind of trick, to extend a record at runtime.
> The empty record field, functions as a sort of offset/label/pointer if you
> will to the new fields that will will be extended to the record by simply
> allocating more memory then the size of the record.
> Then this "label"/"field" can be used as a sort of offset, by typecasting it
> to some extension record type.
> Could be pretty handy, quite impressive trick.
> However, is it safe to use ?
Empty records are valid Pascal.
> I cannot find anything in the documentation about this ?
Nothing in the documentation says it is forbidden either. The reason
it is not explicetely mentioned is because there exists a
much better method, objects:
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