From: Bertram Scharpf <lists@...>
Date: 2009-07-05T23:52:17+09:00
Subject: Re: to_proc and Proc/block conversion with &

Hi,

Am Sonntag, 05. Jul 2009, 19:51:28 +0900 schrieb David A. Black:
> On Sun, 5 Jul 2009, Joel VanderWerf wrote:
>> Russ McBride wrote:
>>
>> constructing a Proc using &:
>>
>>  def map(&b)
>>    b.call ...
>>  end
>>
>> or equivalently with Proc.new:
>>
>>  def map
>>    b = Proc.new
>>    b.call
>>  end
>
> That's not going to access the caller's code, though, since you're
> creating a totally new Proc.

Sorry, but these are not the same:

  Proc.new
  Proc.new { }

Try this:

  def f ; Proc.new ; end
  p = f { "hello" }
  p.call
    #=> "hello"

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de