Re: [BLACKBOX] Exporting records / record fields question

From: [at]} <Chris>
Date: Sat, 31 Jul 2010 10:23:45 +0930

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> -----Original Message-----
> From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
> Marc Martin
> Sent: Friday, 30 July 2010 11:17 PM
> To: BLACKBOX{([at]})nowhere.xy
> Subject: Re: [BLACKBOX] Exporting records / record fields question
>
> > In Section 8.3.1 it states: "Note that when fields in a record r are
> > exported, r should be exported too".
>
> That makes it sound like "good programming practice", not a "compiler
> requirement".
>

Yes - I agree that is what it sounds like. However, taking the part of the
devil's advocate, I would take the example one step further:

R = RECORD
      f1: INTEGER;
      f2: RECORD f3, f4*: INTEGER
      END
    END;

If it is only necessary to export the fields of a record and not the record
itself then, recursively, f4 should be visible to a client program. But if
it is, how on earth would you access it? Or should single-level records be
treated as an exceptional case?

I'm not sure how relevant it is but it should be noted that in Modula-2 it
would have been impossible to export a record field without exporting the
record itself.

Regards,
Chris

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Received on Sat Jul 31 2010 - 02:53:45 UTC