• Vladde Nordholm (11/11) Feb 13 2016 Hello. I have this singleton,
• =?UTF-8?Q?Ali_=c3=87ehreli?= (5/16) Feb 13 2016 David Simcha's DConf 2013 presentation has a singleton implementation at...
• Charles (3/7) Feb 13 2016 Neat video! Watched the singleton section to end up watching the
• Russel Winder via Digitalmars-d-learn (21/33) Feb 13 2016 new this;
• Vladde Nordholm (2/13) Feb 14 2016 Thanks. I'm using David Simcha's singleton now.

Vladde Nordholm <v vladde.net> writes:

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,

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

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

Charles <csmith.ku2013 gmail.com> writes:

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?

Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Sat, 2016-02-13 at 18:58 +0000, Vladde Nordholm via Digitalmars-d-
learn wrote:
 Hello. I have this singleton,
=20
 ------------------------------------------------------
 class Singleton
 {
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0private this() {}
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0static __gshared typeof(this) instance =3D =

new this;
 }
 ------------------------------------------------------
=20
 and I wonder if it has any weaknesses. Or is there a better way=C2=A0
 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..

--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder

Vladde Nordholm <v vladde.net> writes:

On Sunday, 14 February 2016 at 07:16:54 UTC, Russel Winder wrote:
 On Sat, 2016-02-13 at 18:58 +0000, 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.