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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Mon, 13 May 2013 09:03:26 +0200
Organization: Ada @ Home
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Xref: news.eternal-september.org comp.lang.ada:15534
Date: 2013-05-13T09:03:26+02:00
List-Id: <comp.lang.ada>

Le Mon, 13 May 2013 00:15:24 +0200, Robert A Duff  =

<bobduff@shell01.theworld.com> a =C3=A9crit:

> Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org> writes:
>
>> I'm not sure I see the point in having an object for a closed file,
>
> Yeah, I was about to post basically the same thing.  A closed file
> is pretty useless.

As said Niklas, the initial idea was requirements on the state of object=
s  =

for some operation to occur or not occur.

Just on the object for a closed file, this make sense if the object does=
  =

not really disappear when it is closed. If the object still exist in sco=
pe  =

or via kind of references, it needs to have a `Closed` state. That would=
  =

not be the same if the file would be automatically closed when going out=
  =

of scope and always be opened when appearing in the scope.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity