From: 7stud -- <bbxx789_05ss@...>
Date: 2011-07-31T16:27:40+09:00
Subject: Re: avoiding capturing local variables in closures

Robert Dober wrote in post #1013853:
> <snip>
>
> Answered by Michael
>
>> Further, what if I have an instance var that is referencing some large data? Do
> I need to worry >about that being captured by the block or does it not
> matter
> because the block has already >captured self?
>
> At first sight you need to worry if you pass the block to a method
> outside of the receiver because that will create a new reference to
> "self".
> As long as you pass the block around in the same object I do not see an
> issue.
>

Huh?


class Dog
  attr_accessor :val

  def initialize(x)
    @greeting = x
  end

  def make_proc
    return Proc.new { greet }
  end

  def greet
    puts @greeting
  end
end


d = Dog.new('lots of memory')
p = d.make_proc

d = nil
p.call


--output:--
lots of memory

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