<commit_before>module Dydx
  class E
    # include Operator::Base
    # include Operator::General
    # include Operator::Interface

    def d(sym=:x)
      _(0)
    end

    def to_s
      'e'
    end
  end

  def e
    E.new
  end
end<commit_msg>Make E's instance singleton<commit_after>module Dydx
  class E
    # include Operator::Base
    # include Operator::General
    # include Operator::Interface

    def d(sym=:x)
      _(0)
    end

    def to_s
      'e'
    end
  end

  def e
    @e |= E.new
  end
end
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