From: Marc Heiler <lists@...>
Date: 2013-04-04T09:36:20+09:00
Subject: Eigenclass: why this syntax?

Hi. Consider this syntax:

  module Foo
    class << self
      attr_accessor :use_colours
    end
  end

Now, it works to do this:

Foo.use_colours = true
puts Foo.use_colours

Foo.use_colours = false
puts Foo.use_colours

My questions:

- Why is the syntax "class << self" used? For an array, << means to
append. I am unsure what this means for class, or why this syntax was
used.

- Also, in the above example, is it possible to query the @use_colours
variable for when instance methods of module Foo are mixed into a class?
I would like to mixin instance variables that are defined on the
instance level of the module, inside methods defined in that module. So
yeah, basically I want to use a module like a class, but it seems ruby
gives obstacles to that attempt.

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