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Message from discussion Control flow variables
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Dan Sugalski  
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 More options Nov 18 2003, 11:49 am
Newsgroups: perl.perl6.language
From: d...@sidhe.org (Dan Sugalski)
Date: Tue, 18 Nov 2003 11:14:54 -0500 (EST)
Local: Tues, Nov 18 2003 11:14 am
Subject: Re: Control flow variables
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On Tue, 18 Nov 2003, Simon Cozens wrote:
> Austin_Hasti...@Yahoo.com (Austin Hastings) writes:
> > This is what I was talking about when I mentioned being able to do:
> >   &cleanup .= { push @moves: [$i, $j]; }

> This reminds me of something I thought the other day might be useful:

>     $cleanup = bless {}, class {
>         method DESTROY { ... }
>     };

> Of course, it probably wouldn't work in this context because you couldn't
> guarantee that the destructor will be called at the point of loop exit, but I
> like the anonymous class syntax anyway.

     $cleanup = bless {}, class : impatient {
         method DESTROY { ... }
     };

That'll probably do it, at the expense of extra runtime block exit
overhead until the object dies. If you just want a block exit action,
then:

 add_block_exit_action(\&foo);

or something similar will do it. (Though we could add new syntax for it if
you really want... :-)

                                        Dan

--------------------------------------"it's like this"-------------------
Dan Sugalski                          even samurai
d...@sidhe.org                         have teddy bears and even
                                      teddy bears get drunk


 
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