class StdOutErrLogger

def initialize(file = "#{__dir__}/../tmp/hash_delegator_next_link_state.yaml")

def initialize(file = nil) 
def initialize(file = "#{__dir__}/../tmp/hash_delegator_next_link_state.yaml")
  @file = file
  super(file || STDOUT)
  self.formatter = proc do |severity, datetime, progname, msg|
    "#{msg}\n"
  end
end