ruby module extend self vs module_funciton
最近学习ruby过程中,extend self 跟 module_function 傻傻分不清楚,查资料后明白之间的差别,虽记录之,原文地址 github
module A
extend self
def a
puts 'In a'
end
private
def b
puts 'In b'
end
end
module B
def c
puts 'In c'
end
private
def d
puts 'In d'
end
module_function :c, :d
end
A.a => In a
A.b => NoMethodError: private method b called for A:Module
B.c => In c
B.d => In d
class O
include A
include B
end
o = O.new => #<O:0x007f90ed2cdb18>
o.a => In a
o.b => NoMethodError: private method b called for #<O:0x007f90ed2cdb18>
o.c => NoMethodError: private method c called for #<O:0x007f90ed2cdb18>
o.d => NoMethodError: private method d called for #<O:0x007f90ed2cdb18>
总结:module_function 会将module自身的方法变为public(即使方法本身声明为private), mixin之后所有的方法都变为实例的私有方法.
posted on 2017-04-08 13:10 wangchuande 阅读(224) 评论(0) 编辑 收藏 举报