Is this a good singleton?

[Russel Winder via Digitalmars-d-learn]

On Sat, 2016-02-13 at 18:58 +0000, Vladde Nordholm via Digitalmars-d-
learn wrote:
> Hello. I have this singleton,
> 
> ------------------------------------------------------
> class Singleton
> {
>      private this() {}
>      static __gshared typeof(this) instance = new this;
> }
> ------------------------------------------------------
> 
> and I wonder if it has any weaknesses. Or is there a better way 
> to make a Singleton?

Following the ACCU consensus: there is never, ever a good Singleton or
reason to contemplate using one.

Obviously though there are some good ones: about dialogues in GUIs for
example.

The good/evil-ness of Singleton is definitely in it's use: most people
use Singleton wrongly, most uses should be banned. Hence the ACCU
consensus.

It's all about coupling and mostly testability of code..

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder

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