From: "David A. Black" <dblack@...>
Date: 2009-07-06T07:43:40+09:00
Subject: Re: to_proc and Proc/block conversion with &

Hi --

On Mon, 6 Jul 2009, Russ McBride wrote:

> Thanks.  Interesting discussion.
>
>> given &expr, if expr is a Proc object, use it as
>> the block; if not, call to_proc on it.
> ... and then use the resulting proc as a block.
>
> Maybe the best way to think of & is a a proc/block converter, which,
> if called on something that is neither looks first for a to_proc method 
> before performing its conversion.

I'm still not sure whether the lack of calling to_proc on the object
if it's already a Proc is just an optimization. I suppose I like the
uniformity of &obj always meaning: call obj.to_proc, but if the
interpreter is optimizing that away I guess I shouldn't cling to it
:-)


David

-- 
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