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Bind any instance of UnboundMethod to any object, regardless of class.
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By default, instances of UnboundMethod can only be bound to objects that
are a kind_of? the method’s original class. Pretty lame.

rebound allows unbound methods (instances of UnboundMethod class) to be
bound to objects of any class. It uses the alias_method_chain pattern to
accomplish this, meaning you also get a bind_without_indifference method
that retains the original behavior.


class Guy
  def greet
    puts "Hello!"

class Girl
  # No #greet method here

girl =

m = Guy.instance_method(:greet)


girl.greet # => Hello!


  • Could probably use some more specs, since I’m pretty sure I didn’t think
    of everything.


  • ParseTree
  • Ruby2Ruby


I’m just standing on Ryan Davis’ shoulders with
this project. He did all the hard work. I just did something cool with it.
(Which isn’t to say that what he did wasn’t cool, since what he did is way
cooler than what you see here.)

Also, Magnus Holm contributed a patch that made things
cleaner behind the scenes.

Copyright © 2008 Pat Nakajima

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