From: dblack@...
Date: 2006-11-05T22:20:01+09:00
Subject: Re: Accessing instance vars in a block?

Hi --

On Sun, 5 Nov 2006, David Vallner wrote:

> Hmm. This might have been brought up before, but blocks seem rather
> underpowered with respects to manipulating them? A way to prevent their
> binding scope from being clobbered by using them in an instance_eval
> context would be nifty.

But instance_eval takes a block; it's not a special context, but just
how the method works.  I don't think it would be good to try to figure
out where the block came from and set up some mechanism that way.
That goes against the grain of having first-class closures at all.

I think one just has to hope people won't do the "stealth"
instance_eval.  If they do, you'd presumably know about it from the
docs, and can avoid it.


David

-- 
                   David A. Black | dblack@wobblini.net
Author of "Ruby for Rails"   [1] | Ruby/Rails training & consultancy [3]
DABlog (DAB's Weblog)        [2] | Co-director, Ruby Central, Inc.   [4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org