From: Chuck Remes <cremes.devlist@...>
Date: 2011-07-31T01:25:08+09:00
Subject: Re: avoiding capturing local variables in closures


On Jul 30, 2011, at 3:14 AM, Robert Dober wrote:

> <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.

I want to be clear that I understand you. Here's some code that I think illustrates what you mean.

class A
  def some_callback(bigarg1, bigarg2)
   foo = transform(bigarg1)
   bar = transformagain(bigarg2)
    @another_instance = B.new

   avoid_capture(foo, bar)
  end

  def avoid_capture(foo, bar)
    # self (from an instance of A) is captured in the block that 
    # is now held by @another_instance
   @another_instance.schedule_for_execution { baz(foo, bar) }
  end
end

Right?

cr