From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Why doesn't Ada allow user-defined attributes?
Date: Sun, 23 Jul 2017 10:22:14 +0200
Date: 2017-07-23T10:22:14+02:00 [thread overview]
Message-ID: <ol1mbm$36d$1@gioia.aioe.org> (raw)
In-Reply-To: ol1g7l$udm$1@dont-email.me
On 2017-07-23 08:41, G.B. wrote:
> An order established by counting is not a property of the set it self,
> but may involve listing it somehow.
How exactly.
> A specific ordering is not needed for counting.
Not specific but some, any ordering is required. There is none. Full stop.
>>>> Lots of external things cannot be, e.g. a file you have no
>>>> permission to read.
>>>
>>> A file needs to have been _counted_ byte by byte,
>>> or allocated using a known _count_ of bytes, etc.
>>> in order to have this length.
>>
>> No. File length is an attribute of a file. You don't need to read file
>> or to allocate it.
>
> Someone or something must have established the count by,
> well, counting.
It does not matter (even if it were true).
> Otherwise no file can meaningfully have
> that attribute (length) in the first place!
Surely it can. There is a system call "set file length". Get sources,
look at the implementation. No counting there.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2017-07-23 8:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-20 0:02 Why doesn't Ada allow user-defined attributes? Shark8
2017-07-20 9:34 ` Brian Drummond
2017-07-20 16:07 ` Shark8
2017-07-21 4:46 ` Georg Bauhaus
2017-07-21 7:08 ` Dmitry A. Kazakov
2017-07-21 17:11 ` Georg Bauhaus
2017-07-21 19:39 ` Dmitry A. Kazakov
2017-07-22 16:33 ` G.B.
2017-07-22 20:12 ` Dmitry A. Kazakov
2017-07-23 6:41 ` G.B.
2017-07-23 8:22 ` Dmitry A. Kazakov [this message]
2017-07-24 17:52 ` G.B.
2017-07-20 18:53 ` Randy Brukardt
2017-07-20 23:58 ` Matt Borchers
2017-07-21 7:14 ` Simon Wright
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