class RBench::Column

def to_s(val=title)
  str = case val
    when Array      then "%#{width-1}.2f" % (val[0] / val[1]) + "x"
    when Float      then "%#{width}.3f" % val
    when Integer    then "%#{width}.0f" % val
    when TrueClass  then " "*(width/2.0).floor + "X" + " "*(width/2.0).floor
    when String     then "%#{width}s" % (val)[0,width]
    when Object     then " " * width
  end
  return " #{(str.to_s+" "*width)[0,width]} |"
end