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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada 'hello world' for Android; success!
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Date: Tue, 01 Nov 2011 04:41:27 -0400
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Date: 2011-11-01T04:41:27-04:00
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"Randy Brukardt" <randy@rrsoftware.com> writes:

> "Stephen Leake" <stephen_leake@stephe-leake.org> wrote in message 
> news:82mxciogt0.fsf@stephe-leake.org...
> ...
>> In brief, _any_ framework that uses dispatching on class-wide
>> objects needs reference semantics. In Ada, that is indicated by the
>> explicit word 'access'. In Java, it is implicit. I prefer explicit.
>
> I don't follow this. All tagged objects in Ada are by-reference, so you 
> never need explicit "access" for parameter passing. 

Yes, but that's not the meaning of "reference semantics" I intended; I
mean "an explicit pointer of some sort".

> And class-wide objects can be stored in the Ada containers without
> using "access" as well.

In which case a Cursor provides the explicit pointer. 

We've been around on this before; see
http://stephe-leake.org/ada/access_vs_object.html

I guess it's time to update that with Ada 2012 features.

-- 
-- Stephe