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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Community Input for the Maintenance and Revision of the Ada
 Programming Language
Date: Fri, 11 Aug 2017 08:08:12 +0200
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Xref: news.eternal-september.org comp.lang.ada:47696
Date: 2017-08-11T08:08:12+02:00
List-Id: <comp.lang.ada>

On 2017-08-11 03:02, Lucretia wrote:
> On Thursday, 10 August 2017 18:25:30 UTC+1, Dmitry A. Kazakov  wrote:
> 
>>>> Should not they be named? Then it is an anonymous record type:
>>>>
>>>>      function Blah return
>>>>         record Count : Integer; Value : Float end record;
> 
> No, I would prefer notation for tuples, say <> or [] as they have no
> use in Ada, or just use () like we do for everything else. In the
> compiler, it could just generate records.
 >
>     function Blah return <Count : Integer; Value: Float>;

These are different things:

1. type definition
2. aggregate

Clearly, for aggregates () must be used, which is tuple mathematical 
notation too. For type definition record is IMO obvious choice.

> then you could pass Blah to function which took as input (only) a tuple which matched.
> 
>     procedure Do_Thing (Tuple : in <Integer, Float>);
> 
>     Do_Thing (Blah);
> 
>     Tuple : <Count : Integer; Value: Float> := Blah;
 >
> or:
> 
>     Count : Integer;
>     Value : Float;
> 
>     Count, Value := Blah;

This is the key issue: tuple flattening. Flattening is when a tuple is 
used in a list like you did with the assignment of two assorted 
variables above. Or when a tuple is used in plain list of parameters as 
I illustrated before. You need syntax rules for that.

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