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Date: Fri, 23 May 2014 11:59:22 -0700 (PDT)
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Subject: Re: What is the difference of "with null record" and "with private"?
From: "Dan'l Miller" <optikos@verizon.net>
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Date: 2014-05-23T11:59:22-07:00
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On Friday, May 23, 2014 1:19:16 PM UTC-5, Victor Porton wrote:
> What is the difference of "with null record" and "with private"?
>=20
>=20
>=20
> Both denote a descendant of a type with no new additional public fields.

You will see the answer when you focus on why you yourself wrote the word "=
public" there.  I suspect that even you would suspect the falsehood of:  Bo=
th denote a descendant of a type with no additional fields.

> What is the difference and when one or another should be used?

  When the public view of a record is declared 'with null record', then tha=
t record has no additional fields--neither public nor private/encapsulated.=
  When the public view of the record is declared "with private" the record =
may optionally have additional private/encapsulated fields that are maintai=
ned safely by subprograms in that package.

> I see no difference.

That is because you are wearing the blinders of "public".  Look from the bi=
gger picture of the 'private' vantage point to see what more can go on behi=
nd the curtain.