From: "trans.  (T. Onoma)" <transami@...>
Date: 2004-10-13T02:17:01+09:00
Subject: Re: closure's self

On Tuesday 12 October 2004 11:49 am, Robert Klemme wrote:
| Why do you need that?  You *know* the arity because you define the
| argument list between ||.

and

On Tuesday 12 October 2004 12:04 pm, Ara.T.Howard@noaa.gov wrote:
| like this?
|
|    harp:~ > irb
|    irb(main):001:0> cb = proc{|a,b,c| cb.arity}
|    => #<Proc:0xb75a0ecc@(irb):1>
|
|    irb(main):002:0> p cb.call(0,1,2)
|    3
|    => nil

Well, my example was maybe too simplistic. Procs can be passed around, so, no, 
you don't always have a "handle" on them. Moreover, 'this' refers to the 
block actually, not really the Proc.

It seems I got my scope wrong, though. But I'm not sure what this scope is 
yet.

I should also point out that this idea further derives from speculation (over 
on suby-ruby) about internalized counters for #each blocks (and maybe a last? 
and first?) eg-

  ["a","b","c"].each { |x| p this.counter, x }
  => 0
     "a"
     1
     "b"
     2
     "c"

but I want to focus on the block initself first --hence it's arity.

T.