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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Interpretation of extensions different from Unix/Linux?
Date: Wed, 05 Aug 2009 17:33:05 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2009-08-05T17:33:05-04:00
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.acm.org> writes:

> Dmitry A. Kazakov wrote:
>> A memory-mapped container with a tree structure? Consider it done!
>
> It seems to lack persistence, one of the defining features of file systems.

There's no persistence requirement in the RM.  On an embedded system,
it might be perfectly reasonable for files to vanish on program
termination, or on power-off.  Such behavior would be a horrible
bug for an Ada implementation on Unix or Windows -- but it would
still conform to the RM.

There's also RM-1.1.3(6).

Just because some embedded systems don't have file systems, doesn't mean
we shouldn't have portable I/O packages (including directories) in the
language.  I mean, portable to the popular non-embedded operating
systems that exist today, not necessarily portable to any imaginable
OS.

Common Lisp has a pretty reasonable abstraction for dealing with path
names and directories and whatnot.

- Bob