# File lib/cabin/outputs/zeromq.rb, line 67
  def <<(event)
    if @socket.name == "PUB"
      topic = @topic.is_a?(Proc) ? @topic.call(event) : @topic
      error_check @socket.send_string(topic, ZMQ::SNDMORE), "in topic send_string"
    end
    error_check @socket.send_string(event.inspect), "in send_string"
  end