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On 8/13/10 22:03 , Aaron Sherman wrote:
> On Fri, Aug 13, 2010 at 8:11 PM, Jon Murray <perlsm...@gmail.com> wrote:
>
>> My understanding from synopses was that you get the Perl 5 behaviour if
>> you omit the signature on your function declaration (though I
>> unfortunately can't check as I don't have Rakudo installed):
>>
>> sub foo { @_[0] = 1 }
>> my $a = 0;
>> foo($a);
>> say $a; # 0
>>
>>
>
> Nope. In fact, as you indicated in the comment you left in, that prints 0
> just like the first example. In neither case is $a modified. In Perl 5, on
> the other hand, the passed value can be modified:
>
> $ ./perl6 -e 'sub foo { @_[0] = 1 } ; my $a = 0; foo($a); say $a'
> 0
> $ perl -le 'sub foo { $_[0] = 1 } my $a = 0; foo($a); print $a'
> 1
>
> You might well be correct about how it's supposed to work, but that's
> certainly not the current behavior.
As I read the spec, "is ref" should work (with some caveats). I have no
idea if Rakudo currently implements it.
- --
brandon s. allbery [linux,solaris,freebsd,perl] allb...@kf8nh.com
system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu
electrical and computer engineering, carnegie mellon university KF8NH
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