From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=unavailable autolearn_force=no version=3.4.4
X-Received: by 10.129.76.70 with SMTP id z67mr9786400ywa.25.1438472357285;
        Sat, 01 Aug 2015 16:39:17 -0700 (PDT)
X-Received: by 10.140.104.147 with SMTP id a19mr84432qgf.2.1438472357268; Sat,
 01 Aug 2015 16:39:17 -0700 (PDT)
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!usenet.blueworldhosting.com!feeder01.blueworldhosting.com!peer02.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!69no3332919qgl.1!news-out.google.com!78ni2619qge.1!nntp.google.com!z61no4696743qge.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Sat, 1 Aug 2015 16:39:16 -0700 (PDT)
In-Reply-To: <mpji1s$8la$1@dont-email.me>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com;
 posting-host=81.203.145.32;
 posting-account=AFCLjAoAAABJAOf_HjgEEEi3ty-lG5m2
NNTP-Posting-Host: 81.203.145.32
References: <e610ca1e-4df6-4fbb-b3a1-ac35694d9072@googlegroups.com>
 <d5a73210-a67f-4d21-8b16-536af10ab157@googlegroups.com>
 <mpborl$6b9$1@dont-email.me>
 <91f88d79-197c-419f-84a8-908e05967a2c@googlegroups.com>
 <d1tst3FoastU1@mid.individual.net>
 <mpcjpo$93v$1@dont-email.me>
 <135c2b00-d13c-4f5d-a586-8aca442d363b@googlegroups.com>
 <87380683vc.fsf@adaheads.sparre-andersen.dk>
 <347c6be9-c918-4bc0-9494-c93cd6740def@googlegroups.com>
 <mpdts2$72e$3@dont-email.me>
 <4cb32c40-f659-490d-bbb6-73585fc069e8@googlegroups.com>
 <mpfm1b$bif$5@dont-email.me> <mpgcma$hup$1@dont-email.me>
 <7e653a88-e690-431a-9df9-3fc691466e08@googlegroups.com>
 <lyzj2bo4pi.fsf@pushface.org>
 <25e8deb9-a967-4856-97cb-4257e1ba7fa4@googlegroups.com>
 <lyoairo1ao.fsf@pushface.org>
 <a7e26857-2ab6-4cc3-a9ef-f39d2f71a826@googlegroups.com>
 <d23pppF8puoU1@mid.individual.net>
 <84debe67-b26c-40c6-93ae-a2dec28f081b@googlegroups.com>
 <mpj0nq$6fc$1@dont-email.me>
 <c4d1c74a-dd8e-4e15-b73f-aa20cc398ce8@googlegroups.com>
 <mpji1s$8la$1@dont-email.me>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <83abe7a5-69d6-4443-a976-f3b3fbed892a@googlegroups.com>
Subject: Re: Running a preprocessor from GPS?
From: EGarrulo <egarrulo@gmail.com>
Injection-Date: Sat, 01 Aug 2015 23:39:17 +0000
Content-Type: text/plain; charset=ISO-8859-1
X-Received-Bytes: 3137
X-Received-Body-CRC: 2430907151
Xref: news.eternal-september.org comp.lang.ada:27310
Date: 2015-08-01T16:39:16-07:00
List-Id: <comp.lang.ada>

On Sunday, August 2, 2015 at 12:44:46 AM UTC+2, Jeffrey R. Carter wrote:
> On 08/01/2015 01:44 PM, EGarrulo wrote:
> > 
> > if Some_Condition then
> >    -- Call operations of Singleton_Package
> > end if;
> > 
> > translates directly to C++:
> > 
> > if (some_condition) {
> >    // Call static operations of Singleton_Class.
> > }
> > 
> > Where is the difference?  I don't see any.
> > 
> > Actually, I don't see anything esoteric about Ada packages.  I have insisted on
> > a Get_Instance function because otherwise the Singleton pattern wouldn't be any
> > different from global variables (or static class members).
> 
> Here you've lost me again. A singleton is some hidden state and some operations
> that use that state.

It is more than that.  The "Applicability" for the Singleton patterns requires 
that "the sole instance should be extensible by sub-classing, and clients should
be able to use an extended instance without modifying their code."  In other
words: if you don't need sub-classing, then you don't need the complications of
the Singleton pattern.