From: Nathaniel Talbott <nathaniel@...>
Date: 2003-08-23T02:18:05+09:00
Subject: Re: Class variables - a surprising result

Alan Chen [mailto:aero6dof@yahoo.com] wrote:

> The beauty of ruby is that you can clean this up if you 
> really want. 
> 
> class Module
>   # generate "static" variables more like C++ or Java
>   def attr_reader_static(*syms)
>     syms.each { |sym|
>       module_eval( %Q[def self.#{sym}; @#{sym}; end] )
>     }
>   end
> 
>   def attr_writer_static(*syms)
>     syms.each { |sym|
>       module_eval( %Q[def self.#{sym}=(val); @#{sym} = val; end] )
>     }
>   end
> 
>   def attr_accessor_static(*syms)
>     attr_reader_static(syms)
>     attr_writer_static(syms)
>   end
> end
> 
> 
> class Foo
>   attr_accessor_static :staticvar
> end
> 
> Foo.staticvar = 11
> p Foo.staticvar  => 11

Or even:

  class Foo
    class << self
      attr_accessor :staticvar
    end
  end

  Foo.staticvar = 11
  p Foo.staticvar  => 11


Nathaniel

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