From: Kevin Smith <sent@...>
Date: 2001-01-07T04:48:49+09:00
Subject: [ruby-talk:8757] Backward Range implementation

Here's what I came up with that seems to work. I 
didn't exhaustively test all the methods of 
Range, but I think I probably hit the ones that 
weren't working. Oh, I don't expect backward 
ranges to support exclusive mode (it seems 
unbalanced), so I didn't test that.

Gotta love this language!

Kevin

==========================
class Range
	alias old_each each
	def each(&block)
		if (first > last)
			first.downto(last) { |element| yield element}
			return self
		end
		return old_each(&block)
	end
	
	alias old_equal ===
	def ===(obj)
		if (first > last)
			return (last..first).old_equal(obj)
		end
		return old_equal(obj)
	end
end