The answer is I am used to Java, C# etc and just tried to ape those methods. I hadnt thought about using locales.
--- Original Message --- From: "Marshall Lochbaum" <[email protected]> Sent: August 13, 2014 10:30 PM To: [email protected] Subject: Re: [Jprogramming] Singleton Objects in J I'm confused as to why you would use a singleton object over a named locale. A named locale is easy to locate and can be assigned to a noun just like a numbered locale. It's also impossible to create another copy of the locale. Marshall On Wed, Aug 13, 2014 at 10:25:54AM +0100, Jon Hough wrote: > I looked through the jsoftware website but couldn't find any references > tocreating singleton objects in J.So I created my own singleton pattern for > J. It seems to work. > > coclass 'Singleton' > > NB. static instanceinstance =: 0 > > NB. private constructorcreate =. verb defineval =: 1) > > NB. Public gettergetinstance =: verb defineif. instance = 0 do. instance =: > conew 'Singleton'instanceelse. instanceend.) > > NB. Verb for checking.say =: verb defineval =: val + 100t =. 'HEY't) > > destroy =: codestroy > > One thing is, I'm not sure whether making create private stops conew being > called explicitly.To create THE instance or get it, the user should call > getinstance_Singleton_ '' > But users can still call conew 'Singleton' from outside the class without an > error being raised. > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
