__callee__ 和 __method__ 之间的区别 [英] Difference between __callee__ and __method__

问题描述

在 Ruby 中，你可以使用其中之一

In Ruby, one can use either

__callee__ 

或

__method__ 

查找当前正在执行的方法的名称.

to find the name of the currently executing method.

两者有什么区别?

推荐答案

__method__ 静态查找名称，它指的是最近的词法封闭方法定义的名称.__callee__ 动态查找名称，它指的是调用该方法的名称.两者都不需要对应最初发送的消息:

__method__ looks up the name statically, it refers to the name of the nearest lexically enclosing method definition. __callee__ looks up the name dynamically, it refers to the name under which the method was called. Neither of the two necessarily needs to correspond to the message that was originally sent:

class << (foo = Object.new)
  def bar(*) return __method__, __callee__ end
  alias_method :baz, :bar
  alias_method :method_missing, :baz
end

foo.bar # => [:bar, :bar]
foo.baz # => [:bar, :baz]
foo.qux # => [:bar, :method_missing]

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