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Date: Sun, 2 Aug 2015 01:36:39 -0700 (PDT)
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Subject: Re: Running a preprocessor from GPS?
From: EGarrulo <egarrulo@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:27320
Date: 2015-08-02T01:36:39-07:00
List-Id: <comp.lang.ada>

On Sunday, August 2, 2015 at 4:53:49 AM UTC+2, Paul Rubin wrote:
> "Jeffrey R. Carter" writes:
> > Here you've lost me again. A singleton is some hidden state and some operations
> > that use that state. If it can be as simple as calling static operations of a
> > class, then why do you and the DP book insist on all the complications? If the
> > complications are necessary, how can it be that simple?
> 
> Singleton is sort of a misnomer.  It sounds like there is always exactly
> one instance, but it really means there is either one instance or zero
> instances.  There are zero when the program starts, but during the
> program's execution it may decide to create one instance.

Actually, the Singleton pattern lets you add instances later, without the 
clients noticing.