From: pasa@lib.hu   
      
   On 11/22/2012 6:26 AM, Daniel Krügler wrote:   
   > I also don't see how you can compile-time enforce the   
   > essential invariant of a singleton - namely that only one object of   
   > type X exists.   
      
   Err, what makes that an attribute of a singleton? And what possible   
   benefits could that create?   
      
   Signeton is an *object* that is accessible from anywhere in the   
   application, and *that* instance is surely the same.   
      
   Like std::cout, cerr are proper singletons. But they share a class, and   
   you can have any number of other ostreams.   
      
      
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