[Insight-users] void operator=(const Self&); //purposely not implemented

[Arvind Rao]

I noticed this bit code in itk filters:

         void operator=(const Self&); //purposely not implemented

Why isn't the operator=() implemented? I guess it wouldn't make sense to
set a filter to the state of another--at least for the applications I've
worked on.

I seems to me that if  operator=() should be implemented, then why even
declare this function in the header file of the filter?

Thanks in advance answering!
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