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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Prefixed notation for non tagged types
Date: Sun, 17 Dec 2017 16:33:40 +0100
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Xref: reader02.eternal-september.org comp.lang.ada:49504
Date: 2017-12-17T16:33:40+01:00
List-Id: <comp.lang.ada>

On 2017-12-17 16:06, Simon Wright wrote:

> I don't understand why prefixed notation should be limited to private
> types that are completed by records?

Yes, it looks like a simple syntax sugar that the programmer should be 
able to enable for any subprogram and any argument of.

> Naturally, I wasn't involved in any ARG discussions about this (not
> being a member!), but I'd have thought the ideal would be for any
> derived type (which includes private types, I think?) to be a candidate.

Certainly not the way of ARG's thought, but in classic OO prefix 
notation comes from the [wrong] idea that a method is an object's 
member. Thus the notation can be seen as an implementation of a record 
interface X.F where F is naturally dispatching. This in Ada leads to 
tagged types and their primitive operations.

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