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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Using Ada.Containers.Vector and Limited Private types
Newsgroups: comp.lang.ada
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Date: Mon, 7 Jul 2008 16:15:11 +0200
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Date: 2008-07-07T16:15:11+02:00
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On Mon, 7 Jul 2008 06:29:16 -0700 (PDT), Gene wrote:

> On Jul 6, 3:18�pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:

>> I think it is not a good idea to have collections of Directory_Entry_Type.
>> Depending on the implementation, Directory_Entry_Type might use some system
>> resources, locked until Directory_Entry_Type finalization.
> 
> Really?  I can easily see why the "Search" structure would contain a
> handle or lock, but it's hard to see why a directory entry would do
> so.

For example, in order to get a notification when the target gets changed
(or removed), or else in order to prevent such changes.

At least the choice to make Directory_Entry_Type limited indicates that it
is not just a "value."

> At any rate, the GNAT implementation doesn't.

Well, writing GNAT-specific programs is not a good idea either.

Anyways, if the collection were intended to contain directory item names,
then it would be better and cleaner to design it in just this way.
Ada.Container.Indefinite_Ordered_Maps : String -> File_Kind or a similar
collection would perfectly do the job.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de