From: Philipp Meier <meier@...>
Date: 2002-08-15T21:32:31+09:00
Subject: Re: adding method to existing class


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On Thu, Aug 15, 2002 at 09:20:24PM +0900, Eugene Scripnik wrote:

>   Now I want object blah (and other objects of some_class) to respond
>   to method some_method. I've tried to include module with my method
>   but I don't like evaling:
>=20
>   module Feature
>          def some_method
>          ...
>          end
>   end
>   some_class.class_eval { include Feature }
>   blah =3D some_class.new( 'anything' )
>=20
>   Now blah responds to some_method. Is there way to include methods
>   without eval?

class ExistingClass
	...
end

ExistingClass.new.some_method   # -> NameError: undefined method
`some_method' for #<ExistingClass:.....>

module Feature
	def some_method
	...
	end
end

class ExistingClass
	include Feature
end

ExistingClass.new.some_method   # -> ok


--=20
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