From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: How to write "Hello" to a text file without a line terminator
Date: Sun, 14 Aug 2016 10:40:31 +0100
Organization: A noiseless patient Spider
Message-ID: <lyr39r1yeo.fsf@pushface.org>
References: <2cc97e17-313e-44b8-b335-8d5e815e925a@googlegroups.com>
	<nojti9$8sq$1@gioia.aioe.org>
	<4c49991e-9001-464f-afbb-3fcbf78e5656@googlegroups.com>
	<nol1ao$fpp$1@dont-email.me>
	<ee68c010-85f0-4c38-b335-cdb3815f45c4@googlegroups.com>
	<nom7bg$t7l$1@dont-email.me>
	<41b076f1-66b0-4142-8b91-0e717b6176c2@googlegroups.com>
	<nonne4$606$1@dont-email.me>
	<7dd84caf-d094-4498-a6f1-91e275f09346@googlegroups.com>
	<lyvaz321nv.fsf@pushface.org> <nopbk2$1qmn$1@gioia.aioe.org>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx02.eternal-september.org;
 posting-host="5267241106bfbad1cae7e8b738bf59f6";
	logging-data="24428"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1+OwohyyQ1CRok6TY9eOGd09fnRi7k3uew="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (darwin)
Cancel-Lock: sha1:6AdqyRPCj9zRXJTh4IF0aLfCmLo=
	sha1:+t2b6Ie5orT+9ozFHkDSvzqvgLo=
Xref: news.eternal-september.org comp.lang.ada:31431
Date: 2016-08-14T10:40:31+01:00
List-Id: <comp.lang.ada>

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On 2016-08-14 10:30, Simon Wright wrote:
>
>> Come to think of it, what would the use case be for instantiating
>> Sequential (or Direct) IO with an unconstrained type?
>
> Direct_IO requires a constrained type.

So it does. And Sequential_IO explicitly permists an unconstrained
type. Still,

>> they both have
>> only procedural forms for Read, so how could you ever retrieve a value?
>
> Does it matter? It is not portable to use anyway.

I am saying that (it seems to me that) it is impossible to read back
from Sequential_IO with an unconstrained type even on the same machine
with the same compiler.

> All that needed is pragma Assert that Stream_Element'Size = 8 and
> Stream_Element_Array I/O.

Ada.Streams.Stream_IO & String'Write is even simpler in 99.9% of cases.