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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada-Singleton-Why does it work like this?
Newsgroups: comp.lang.ada
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Date: Wed, 25 Mar 2009 10:30:24 +0100
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On Tue, 24 Mar 2009 17:10:11 -0700 (PDT), Martin wrote:

> On Mar 24, 8:47�pm, "Jeffrey R. Carter"

>> This is a very poor solution to the problem. A much simpler solution is
>>
>> package Singleton is
>> � � procedure Set (Value_1 : in Integer; Value_2 : in Integer);
>>
>> � � procedure Print;
>> end Singleton;
> 
> But you can not derive a class from this:

Firstly you can. There are child packages in Ada, they are equivalent to
derivation.

Secondly, you may not because it is a singleton. A derived variant would be
meaningless without making an instance of, which would be *another*
instance of now non-singleton.

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