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Groups > comp.lang.ruby > #3071

Undefine Method Only Marks the Method Undefined

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Hello,

According to the book Programming Ruby by Dave Thomas, "an
undefined method still exists - it is simply marked as being undefined."
Why is it not completely removed?

I find this somewhat related to the fact that an object still cannot be
dumped after "undefing" its singleton methods.

obj = Object.new

def obj.foo
end

p obj.respond_to? :foo  # => true

class << obj
  undef foo
end

p obj.respond_to? :foo  # => true

Marshal.dump(obj)       # => error

-- 
Posted via http://www.ruby-forum.com/.

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Thread

Undefine Method Only Marks the Method Undefined Su Zhang <zhangsu@live.com> - 2011-04-17 17:37 -0500
  Re: Undefine Method Only Marks the Method Undefined Michael Edgar <adgar@carboni.ca> - 2011-04-17 18:11 -0500
  Re: Undefine Method Only Marks the Method Undefined Josh Cheek <josh.cheek@gmail.com> - 2011-04-17 18:11 -0500
  Re: Undefine Method Only Marks the Method Undefined Su Zhang <zhangsu@live.com> - 2011-04-17 19:11 -0500

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