Re: [BLACKBOX] Exporting records / record fields question

From: [at]} <Chris>
Date: Sat, 31 Jul 2010 10:48:57 +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".
>

I have found one module written by Wirth that appears to support this view.
In the Project Oberon book, there is a module 'Core' which has a private
type 'Queue' with a public field 'n':

  Queue = RECORD n*: INTEGER;
    first, last: Task
  END ;

The following variables are exported:

  VAR
    PrintQueue*, MailQueue*, LineQueue*: Queue;

and 'n' is then accessed in the module PrintServer e.g.

  IF (Core.PrintQueue.n > 0) ...

Regards,
Chris

Chris Burrows
CFB Software
http://www.cfbsoftware.com
  

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Received on Sat Jul 31 2010 - 03:18:57 UTC