From: Ged Byrne <gedb01@...>
Date: 2003-08-18T21:50:57+09:00
Subject: Re: @@newimpl and @newimpl in Net

So @implVersion is an entirely different variable to
@@implVersion.

In Net/HTTP @implVersion is only assigned in one
place:

    def HTTP.setimplversion( obj )
      f = @@newimpl
      obj.instance_eval { @newimpl = f }
    end

I cannot find anywhere in the code that is calling
.setimplversion, yet changing the declaration of
@@newimpl is reflected in @newimpl.

Could anybody explain how this is working?


> The big difference is that all instances of one
> class
> share the same class variable, but have their own
> individual
> instance variable.
> 
> If you change a class variable, it will change
> for all instances of that class.
> 
> If you change an instance variable, only the
> instance variable
> of one specific instance will change and not for all
> the other instances.
> 
> bye, -A.


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