require 'traits'
#
# getters delegate to setters iff called with arguments 
#
class AbstractWidget
  class_trait 'color' => 'pinky-green'
  class_trait 'size' => 42
  class_trait 'shape' => 'square'

  trait 'color'
  trait 'size'
  trait 'shape'

  def initialize
    color self.class.color
    size self.class.size
    shape self.class.shape
  end
  def inspect
    "color <#{ color }> size <#{ size }> shape <#{ shape }>"
  end
end

class BlueWidget < AbstractWidget
  color 'blue'
  size 420
end

p BlueWidget::new