From: Mike Stok <mike@...>
Date: 2013-04-09T20:15:43+09:00
Subject: Re: Confusion with Forwarrordable#delegate - throwing an er

What are you trying to do exactly? If you want to add a couple of delegations to an instance of MyQueue then maybe this is what you want to do:

# ... your class definition

def exercise(obj)
  puts "exercising #{obj}"
  puts obj.first
  obj.mypush 'foo'
  puts obj.first
  obj.clear
  puts obj.first
end

q1 = MyQueue.new
class << q1
  delegate [:clear, :first] => :@queue
end

q2 = MyQueue.new
exercise q1 # should have first & clear methods delegated
exercise q2 # should complain at the first call of first

Hope this helps,

Mike

On 2013-04-07, at 2:50 AM, Love U Ruby <lists@ruby-forum.com> wrote:

> require 'forwardable'
> 
> class MyQueue
> 
>  extend Forwardable
>  attr_reader :queue
> 
>  def initialize
>    @queue = []
>  end
> 
>  def_delegator :@queue, :push, :mypush
> 
> end
> 
> q = MyQueue.new
> 
> q.instance_delegate [:clear, :first] => @q
> #`<main>': undefined method `instance_delegate' for #<MyQueue:0x2119e48
> @queue=[]> (NoMethodError)
> 
> q.delegate [:clear, :first] => @q
> 
> #`<main>': undefined method `delegate' for #<MyQueue:0x2109e40
> @queue=[]> (NoMethodError)
> 
> 
> Can you tell me what wrong I did? How to fix that?
> 
> -- 
> Posted via http://www.ruby-forum.com/.

-- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.