Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:48180
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain easyflirt.com designates 91.199.255.56 as permitted sender)
Message-ID: <4BDEF1AF.70704@easyflirt.com>
Date: Mon, 03 May 2010 17:54:23 +0200
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100423 Thunderbird/3.0.4
MIME-Version: 1.0
To: internals@lists.php.net
References: <4BDEC91F.9080305@easyflirt.com> <4BDEEEDA.1050806@cschneid.com>
In-Reply-To: <4BDEEEDA.1050806@cschneid.com>
Content-Type: multipart/alternative;
 boundary="------------030501060202080407060302"
Subject: Re: [PHP-DEV] Re: Closure local return
From: mathieu.suen@easyflirt.com ("mathieu.suen")

--------------030501060202080407060302
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit


> I think you actually misunderstand the difference in
> http://en.wikipedia.org/wiki/Closure_%28computer_science%29#Differences_in_semantics
>
> The way I read if the difference is wether it returns from the closure
> function or the surrounding function *calling* it. Not the *defining* scope.
>
> And no, it doesn't make sense in the PHP context IMHO.
>
> - Chris
>
>    
"returns from the closure function"
To go were?

I had maintain a smalltalk compiler.
I did not misunderstand the difference.

The Common Lisp implementation is the more explicit one.
For exemple:

(defun eval-l1 (fct) (funcall fct))
(defun bar (x) (eval-l1 #'(lambda () (return-from bar 45)))
                         x)

(bar 23) -> 45

When funcall is apply you do not return from eval-l1. You return from bar.
Which is the defining scope of the lanbda.


-- Mathieu Suen
	


--------------030501060202080407060302--