Cees De Groot puso en su mail :

> The code you've posted is a pattern - if you have a class where you
> want a singleton instance, you use this code in that class. There's no
> need for a seperate class to handle this

I reading more about this, and found this by Stef

http://www.iam.unibe.ch/~ducasse/Web/OldSmalltalkFiles/Singleton.pdf.


But something still seem unsolved if for having a needed behavior (what only
exist one instance of MyClassFoo) we have type (or copy) a piece os same
code several times.

Anyway, I follow you advice and thanks you.

Edgar



	

	
		
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