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Date: Wed, 14 Nov 2012 15:29:20 -0800 (PST)
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Subject: Re: Perl goto (was: static variable problem)
From: "C.DeRykus" <dery...@gmail.com>
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On Wednesday, November 14, 2012 5:23:49 AM UTC-8, Rainer Weikusat wrote:
> "C.DeRykus" <dery...@gmail.com> writes:
> 
> 
> 
> [...]
> 
> 
> 
> >   goto BLOCK;
> 
> >
> 
> >   FOO: foo("Hello World");
> 
> >   exit;
> 
> >
> 
> >   BLOCK: {
> 
> >     my $bar = 1;
> 
> >
> 
> >     sub foo
> 
> >     {
> 
> >       my $a = shift;
> 
> >       print "$bar $a\n";   
> 
> >       return;
> 
> >     }
> 
> >     goto FOO;
> 
> > };
> 
> 
> 
> In contrast to 'other languages', the destination of a Perl goto is
> 
> determined at runtime, by 'outward' searching (IIRC, term used by the
> 
> Camel book) for a matching label in all currently active lexical
> 
> scopes. This implies that, compared to other means for performing flow
> 
> control, it is a very expensive operation.
> 
> 
> 
> --------------
> 
> use Benchmark;
> 
> 
> 
> timethese(-5,
> 
> 	  {
> 
> 	   goto => sub {
> 
> 	       goto out;
> 
> 
> 
> 	       print "ha!";
> 
> 
> 
> 	       out:
> 
> 	       return 3;
> 
> 	   },
> 
> 
> 
> 	   return => sub {
> 
> 	       return 3;
> 
> 	   }});

Thanks, that's interesting. I would have
thought that it'd be much cheaper. Of course, 
spaghetti code is super bad anyway for all
the reasons we know about.  You gotta have
Clint Eastwood's steely gaze and grit to 
follow the crooked trails and dodge bullets 
that might ricochet anywhere.  

That's why I said "duck".

-- 
Charles DeRykus