Trying to learn, I don't found a Singleton class in Squeak ( maybe exist
whit another name ? )

So following
http://www.eli.sdsu.edu/courses/spring01/cs635/notes/singleton/singleton.htm
l
We could have:

Object subclass: #Singleton
   instanceVariableNames: ''
   classVariableNames: 'UniqueInstance '
   poolDictionaries: ''
   category: 'Kernel-Classes'
   
current
   UniqueInstance ifNil: [UniqueInstance := Singleton basicNew].
   ^UniqueInstance
   
new
   self error: 'Use current to get an instance of Class ' , self name

Wish to know:

1) If exist this with another name
2) In case not, why not
3) How could hurt me (us) if we have this

Thanks in advance.

Edgar



	

	
		
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