Singleton - Ruby on Rails 繁體中文

方法

D

執行個體公開方法

Singleton 的執行個體不具備可複製性

Class.new.include(Singleton).instance.dup # TypeError (can't dup instance of singleton

# File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 66
def duplicable?
  false
end