Ruby BasicObject.singleton_method_removed用法及代碼示例

singleton_method_removed(symbol)

每當從接收器中刪除單例方法時作為回調調用。

module Chatty
  def Chatty.singleton_method_removed(id)
    puts "Removing #{id.id2name}"
  end
  def self.one()     end
  def two()          end
  def Chatty.three() end
  class << self
    remove_method :three
    remove_method :one
  end
end

產生：

Removing three
Removing one