> On 21 Jan 2017, at 11:59, Peter Uhnak <i.uh...@gmail.com> wrote: > > On Sat, Jan 21, 2017 at 11:19:24AM +0100, stepharong wrote: >> Pay attention that Singleton should not be about access but time. >> >> If you can by adding on instance variable avoid to need a singleton >> then it means that it was not a singleton. >> >> A singleton is often: >> you **CANNOT** have two instances at the same time. >> >> Many people do not use well singleton so watch out. > > We have several variations of singletons in the Pharo codebase, some of which > do allow multiple instances, some of which don't. But they are differentiated > by names. > > https://www.peteruhnak.com/blog/2015/12/06/singleton-variations/
That's a good summary, thanks Peter. > Peter > >> >> Stef >> >> On Thu, 19 Jan 2017 11:23:21 +0100, Siemen Baader >> <siemenbaa...@gmail.com> wrote: >> >>> Is there a trait to quickly create singletons in Pharo, along the >>> way of the Ruby Singleton mixin? >>> >>> https://ruby-doc.org/stdlib-1.9.3/libdoc/singleton/rdoc/Singleton.html >>> >>> (and ideally also observer/observable, which I am going to need next..) >>> >>> -- Siemen >> >> >> >> -- >> Using Opera's mail client: http://www.opera.com/mail/ >
