From: Robert Klemme <shortcutter@...>
Date: 2010-01-25T22:52:44+09:00
Subject: Re: Class variable inside block of defining instance method

2010/1/25 Charles Oliver Nutter <headius@headius.com>:
> Ruby doesn't scope quite like that normally, but you can do it using
> instance_eval and define_method:
>
> def initialize(server1, server2)
>  @echo = echo = IRC::Client.new(*server1)
>  @listen = IRC::Client.new(*server2)
>  @echo.instance_eval do
>    define_method :message_received do |nick, channel, message, *args|
>      if channel == "#Pre"
>        echo.puts("PRIVMSG #{echo.channel} :#{message}")
>      end
>    end
>  end
> end
>
> instance_eval has some quirks, and define_method methods are never as
> fast as normal methods (since they have full block dispatch
> semantics), but this should do what you need.

Unlikely, since the method was defined on @listen and not @echo. :-)
This is probably a better solution:

def initialize(server1, server2)
	@echo 	= IRC::Client.new(*server1)
	@listen = IRC::Client.new(*server2)

	class <<@listen
		attr_accessor :echo
	end
	
	@listen.echo = @echo
	
	def @listen.message_received(nick, channel, message, *args)
		if channel == "#Pre"
			echo.puts("PRIVMSG #{echo.channel} :#{message}")
		end
	end
end

Kind regards

robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/