From: Charles O Nutter <headius@...>
Date: 2006-03-27T15:11:28+09:00
Subject: Re: Tricky block args

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That is very good to hear. This short-cut behavior seems counter intuitive
to me, and I'm not a fan of unexpected side effects. However, Rails uses
this short-cut in several places, and so if we want to run Rails today, we
must support this syntax. I look forward to the future reduction of block
parameters to local variables.

Thank you for the help, I will look at the code in the area you suggest.

On 3/27/06, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
>
> Hi,
>
> In message "Re: Tricky block args"
>     on Mon, 27 Mar 2006 13:54:58 +0900, "Charles O Nutter" <
> headius@headius.com> writes:
>
> |We are trying to implement some missing block arg functionality. Could
> |someone knowledgable about the more unusual methods of declaring block
> args
> |point us to where in the C code it is implemented? Specifically, the
> ability
> |to specify an array or hash location as the target for a block param:
> |
> |x =3D [0]
> |[1,2].each {|x[0]|}
>
> The assignment to x[0] is done in assign() function, especially at the
> code after /* array set */ comment.  It's called from rb_yield_0().
>
> FYI, in the future, block parameters will be restricted to local
> variables only, so that I don't recommend using something other than
> local variables for the parameters.
>
>                                                         matz.
>
>


--
Charles Oliver Nutter @ headius.blogspot.com
JRuby Developer @ jruby.sourceforge.net
Application Architect @ www.ventera.com

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