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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Ada 2012: In-out parameters for functions
Date: Thu, 02 May 2013 09:11:18 +0200
Organization: Ada @ Home
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Xref: news.eternal-september.org comp.lang.ada:15293
Date: 2013-05-02T09:11:18+02:00
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Le Thu, 02 May 2013 08:41:41 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
>> This is more a procedure than a function (it either won't return the =
 =

>> same
>> the next time invoked with the same argument or either the argument c=
an
>> never be considered to be the same as it use to be any=E2=80=91more),=

>
> Surely it will. Same argument means same value and the value of a stre=
am  =

> is
> its state. If the stream is in the same state the function will return=
  =

> same
> result.

If the state includes the last operation time (with non=E2=80=91overlapp=
ing time  =

guaranteed for each operations), then that may be an example where it  =

could make sense.

>> and a
>> function construct is used only because it is preferable to return an=

>> unconstrained type
>
> Not only. Functions are used when there is a dedicated result/effect  =

> which
> is used as an input for another routine or language construct.

Yes, that's the only way to expressions.

-- =

=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