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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: File_Exists (Was: Press Release - Ada 2012 Language Standard
 Approved by ISO)
Date: Fri, 11 Jan 2013 20:36:11 +0100
Organization: Ada @ Home
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Date: 2013-01-11T20:36:11+01:00
List-Id: <comp.lang.ada>

Le Fri, 11 Jan 2013 17:19:37 +0100, Jacob Sparre Andersen <sparre@nbi.dk=
>  =

a =C3=A9crit:

> Dmitry A. Kazakov wrote:
>
>> Never use File_Exists if you can.
>
> One of my colleagues could come up with a sensible use case for
> "File_Missing": When a web service wants to know if it should ask a us=
er
> to upload a profile image (stored in a file).
>
> Some applications use the existence of certain files as a simple
> external management interface.  Although I consider this bad style and=

> prefer a socket based management interface, it might be considered a
> reasonable use as well.
>
> Can anybody supply some other sensible use cases for
> File_Exists/File_Missing.

A build system? (not restricted to building applications). One may want =
to  =

check if the file exist, instead of trying to create or open it for  =

rewrite and only then getting an exception if the file does not exist.


-- =

=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