RE: couple questions about refs

[NYIMI Jose (BMB)]

#!/usr/bin/perl
use strict;
use Benchmark;

sub using_aref{
        my $aref=[];

        @$aref=(1,2,3,4,5);
        return $aref;
}

sub using_array{
        my @array=();

        @array=(1,2,3,4,5);
        return \@array;
}

And the winner is :

timethese (1000000,{ using_aref => \&using_aref,using_array => \&using_array});

Benchmark: timing 1000000 iterations of using_aref, using_array...
using_aref:  9 wallclock secs ( 7.99 usr +  0.00 sys =  7.99 CPU) @ 125125.13/s
(n=1000000)
using_array:  5 wallclock secs ( 5.20 usr +  0.00 sys =  5.20 CPU) @ 192381.69/s
 (n=1000000)


José.

> -----Original Message-----
> From: Jenda Krynicky [mailto:[EMAIL PROTECTED]] 
> Sent: Monday, December 16, 2002 3:51 PM
> To: [EMAIL PROTECTED]
> Subject: Re: couple questions about refs
> 
> 
> From:                 christopher j bottaro <[EMAIL PROTECTED]>
> > hello again,
> > all my c instincts tell me i shouldn't write a function 
> like this: sub
> > myfunc()    {
> >  my $aref = [];
> >  if ( some_cond )   {
> >   return undef;
> >  }
> >  else       {
> >   #populate @{$aref}
> >   return $aref;
> >  }
> > }
> > but its cool, right?
> 
> Yes this is fine in Perl. Perl simply does the right thing :-)
>  
> > i know what i really should do is this:
> > sub myfunc()        {
> >  my @array;
> >  if ( some_cond )   {
> >   return undef;
> >  }
> >  else       {
> >   #populate @array
> >   return [ @array ];
> >  }
> > }
> 
> Well ... I would use
> 
>       return \@array;
> 
> it's a bit more Perlish and actually I expect it to be 
> quicker. (Benchmarking is left to the reader)
> 
> > anyways, second question:  how do i create/invoke a function ref?
> > 
> > i wanna do something like this:
> > sub myfunc()        {
> >  #blah blah
> > }
> > my $fref = \&myfunc();  # is this right?
> 
> without the ():
> 
>       my $fref = \&myfunc;
> 
> > &{$fref}($arg1, $arg2);  #is this right?  are there any 
> shortcuts like 
> > $fref->($arg1, $arg2)?  i know this is the syntax for invoking a 
> > method, but i don't wanna go thru the hassle of making a class
> 
> Both these syntaxes are OK. No need for any classes or whatever.
> 
> Jenda
> 
> ===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz =====
> When it comes to wine, women and song, wizards are allowed 
> to get drunk and croon as much as they like.
>       -- Terry Pratchett in Sourcery
> 
> 
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