From: Jean-denis Vauguet <jd@...>
Date: 2010-09-22T02:06:46+09:00
Subject: temporarily override instance variable in a block

Hi,

I strived to override instance variable on a per-block basis, but I'm
not satisfied with my results. Here's a snippet:
http://gist.github.com/589924

The goal is: execute a block but have it use a different value for a
previously defined instance variable, all of this in the context of a
class instance (the instance variable belongs to this class instance).

Two approach are illustrated: variable swapping and instance_eval. The
former does the trick but it's cumbersome and not thread-safe. The
latter, I don't understand why, fails, for the block seems to be called
in the

If anyone can help with this, thanks in advance!
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