From: Eric Mahurin <eric_mahurin@...>
Date: 2005-06-07T10:25:32+09:00
Subject: Re: Why no class_variable_set?

--- Michael Schuerig <michael@schuerig.de> wrote:
> I'm looking for a clean way to reflectively set the value of
> a class
> variable. Currently I'm using something along the lines of
> 
> class_eval("@@var = #{value.inspect}")
> 
> which I don't like much. There is no class_variable_set, but,
> so I
> thought, maybe instance variables of the class object are
> treated as
> class variables, thus I tried
> 
> klass.instance_variable_set(:@@var, value)
> 
> `@@var' is not allowed as an instance variable name
> 
> So, this doesn't work. Then there's
> 
> class_eval <<END
>   def self.var=(value)
>     @@var = value
>   end
> END
> private_class_method :var=
> self.var = value
> 
> Is this the way to go?
> 
> Michael

Instead of using a class variable, you could use an instance
variable of the class:

class XYZ
    def self.var=(value)
        @var = value
    end
    def self.var
        @var
    end
end

XYZ.var and XYZ.var= will deal with an instance variable of the
class object XYZ which is like a class variable (but not
directly accessible from the instances of XYZ).  I don't see
much of a reason to have class variables in the language since
you can do this.



		
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