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我见过最清楚的解释class_eval 和 instance_eval

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at 2013-04-02 07:06:59

original http://hlee.iteye.com/blog/1840489

忘了，看一次就能回忆起来

class A
  # defs here go to A
  puts self  # => A
  class << self
     #defs here go to A's eigenclass
  end
end


A.class_eval do
  #defs here go to A
end

A.instance_eval do
  #defs here go to A's eigenclass   

end

s = "Hello World"

class << s
  #defs here go to s's eigenclass
end

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