From: Damphyr <damphyr@...>
Date: 2005-09-29T01:10:19+09:00
Subject: Class Methods and derivation

I do something like the following

class Test
	def Test.open
		tt=Test.new
		yield tt
		tt.close
	end
end

class DerivedTest<Test
	include SomeModule
end

Obviously the following will fail

DerivedTest.open{|tt|
	tt.some_module_method
}	

so I moved open to DerivedTest.

Can I write a class method that instantiates the proper derived class?
I need a way to find the class of the caller and instantiate that :)
Am I asking for the impossible? I think not, since IO.open does this, 
although the code is C - the call to rb_class_new_instance obviously 
instantiates the proper class. How can I do that in pure Ruby?
Cheers,
V.-
-- 
http://www.braveworld.net/riva

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