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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: why access parameter in stream attributes to begin with,
 instead of in or in/out ?
Date: Mon, 11 Jun 2018 18:17:16 -0500
Organization: JSA Research & Innovation
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Date: 2018-06-11T18:17:16-05:00
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"Shark8" <onewingedshark@gmail.com> wrote in message 
news:cb1b3f8b-bf3b-4768-99af-5575a55cf682@googlegroups.com...
> On Monday, June 11, 2018 at 3:49:28 PM UTC-6, Mehdi Saada wrote:
>> Hi.
>>
>> I wondered why in Ichibiah's design, in the beginning, stream have been 
>> made to work with access types/access parameters ?
> Hard to say; his design [Ada83] didn't have streams.

Right, streams were an Ada 95 feature.

>> I could have imagined that the attributes would work with a in/out stream 
>> parameter, and stream(blabla) would give an object of stream type.
>> I don't know if storing streams' access values for later use is common, 
>> one would just have to add .all when appropriate...
> Good questions, I want to say it's not common to pop access-type via 
> streams, but maybe I'm just unadventurous.

Ada 83/95/2005 do not allow functions to have parameters that are out or in 
out. "access" was (mistakenly) thought to be a work-around for that. 
Streams, being an Ada 95 feature, used that work-around. It used it 
consistently, I suppose so that all of the stream attributes would work the 
same (it would be weird for Input and Read to work differently - remember, 
Input is a function and has to be one since the result in unconstrained).

                                          Randy.