From: Emmanuel Oga <oga_emmanuel_oga@...>
Date: 2008-08-27T00:12:48+09:00
Subject: Re: Passing a block with define_method

> I'm actually wrapping existing methods so I need to use define_method to
> retain access to the old method. Here's my (broken) code so far:

I think I saw this "trick" in one of Ara's posts :D

* Store the method somewhere so it is not GC by ruby
* Retrieve the method object from its object_id with ObjectSpace._id2ref
* use eval instead of define_method

> module Continuations
    NOGC = []
>   def accepts_continuation(*args)
>     args.each do |method_name|
>       func = instance_method(method_name)
        NOGC << func # Stop garbage collection of the method.
        func_object_id = func.object_id
>       #define_method(method_name) do |*params, &block|
>       #  value = func.bind(self).call(*params)
>       #end
        eval(<<-CODE, __FILE__, __LINE__)
          def #{ method_name }(*params, &block)
            func = ObjectSpace._id2ref(#{ func_object_id })
            func.bind(self).call(*params, &block)
          end
        CODE
>     end
>   end
> end
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