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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: a new language, designed for safety !
Date: Fri, 13 Jun 2014 18:13:16 +0200
Organization: cbb software GmbH
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Date: 2014-06-13T18:13:16+02:00
List-Id: <comp.lang.ada>

On Fri, 13 Jun 2014 09:55:52 -0600, Shark8 wrote:

> On 13-Jun-14 02:36, Dmitry A. Kazakov wrote:
>> Range should have been a proper type.
> 
> That would have been nice.
> 
>> A'Range should have been a primitive
>> array interface operation.
> 
> Doesn't its status as a attribute, automatically accessible to any 
> array-type, put it in a similar category? (IOW, what's wrong with it 
> being an attribute?)

You cannot override and re-implement it:

   type Ordered_Container is ... and What?;
   overriding -- What interface?
       function Range (X : Ordered_Container) return Which type?

Technically primitive operations could be treated as attributes the way
they are as "record members":

   type T is tagged ...;
   function Foo (X : T) return Bar;

X.Foo is legal, so make X'Foo legal as well.

>From the language design POV all different syntaxes of subprogram call must
be treated uniformly, which includes indexing, aggregates, attributes,
members, prefix, postfix, infix, assignment sugars. 

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