From: laotse@...
Date: 2001-06-28T13:15:12+09:00
Subject: [ruby-talk:16988] using alias_method

I have a question about using alias_method. Here's what I'm trying to do:

class Redef
	def hello
		print "hello\n"
	end
	def rename
		eval <<-ENDDEF
			def hello
				print "goodbye\n"
			end
		ENDDEF
	end
end

test = Redef.new
test.hello
test.rename
test.hello

Okay, the above works just fine and dandy. But what I also want to do is
alias "hello" to a new method name to preserve it before I change it.

At first I thought alias_method looked promising. Unfortunately, its a
private instance method of module Module and I can't figure out any way to
use it within a class.

My ultimate goal is to have a mixin module, which contains a method
"wrap_method", which can be included in any class. Including it would add
the wrap_method method which would alias an existing method in that class
to a new name, then redefine the method.

Can I use alias_method somehow? If not, is there another way I can
accomplish this?

-----------------------------------------------------------------------------
Brian Knox
Just Another Perl Hacker
perl -le '$_="6110>374086;2064208213:90<307;55";tr[0->][ LEOR!AUBGNSTY];print'