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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Little people supporting Ada, possibly through AdaCore?
Date: Sun, 06 May 2012 20:33:39 +0100
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Date: 2012-05-06T20:33:39+01:00
List-Id: <comp.lang.ada>

"Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr> writes:

> Le Sun, 06 May 2012 18:55:27 +0200, Simon Wright <simon@pushface.org>
> a écrit:
>> Oliver's use is rather more like what Rational Rose used to call a
>> "utility class" (one which has no instances) than a singleton (which ash
>> one instance).
>
> What's the difference? It has to be instantiated, anyway.

Not sure what you mean by 'instantiated'.

If the UML model has a class marked <<singleton>> then something in the
generated or handwritten code will have to provide a place for the
class's attributes; in some sort of instance record.

If a class is marked <<utility>>, on the other hand, I'd expect it to be
illegal (in that profile) for the class to have any attributes, so there
can be no need for an instance record.