Is this a good singleton?
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?
,vladde,
Re: Is this a good singleton?
On 02/13/2016 10:58 AM, Vladde Nordholm 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?
,vladde,
David Simcha's DConf 2013 presentation has a singleton implementation at
27:55:
https://www.youtube.com/watch?v=yMNMV9JlkcQ
Ali
Re: Is this a good singleton?
On Saturday, 13 February 2016 at 19:32:33 UTC, Ali Çehreli wrote: David Simcha's DConf 2013 presentation has a singleton implementation at 27:55: https://www.youtube.com/watch?v=yMNMV9JlkcQ Ali Neat video! Watched the singleton section to end up watching the rest of the video. Anything every come of the std.patterns idea?
Re: Is this a good singleton?
On Sat, 2016-02-13 at 18:58 +, 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.win...@ekiga.net
41 Buckmaster Roadm: +44 7770 465 077 xmpp: rus...@winder.org.uk
London SW11 1EN, UK w: www.russel.org.uk skype: russel_winder
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Re: Is this a good singleton?
On Sunday, 14 February 2016 at 07:16:54 UTC, Russel Winder wrote: On Sat, 2016-02-13 at 18:58 +, Vladde Nordholm via Digitalmars-d- learn wrote: [...] 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.. Thanks. I'm using David Simcha's singleton now.
