[Melbourne-pm] Weirdness with references

[Alfie John]

Thanks guys! I should have Dumper()'d it before hand.

Now another wierd thing I just found:

FAILS
    print %{ {} }

WORKS
    print %{ undef || {} }

Looks like Perl doesn't like balanced curlies without any surrounding fluff :)

Alfie

On 9/7/06, Scott Penrose <scottp at dd.com.au> wrote:
> Very odd...
>
> A quick note to anyone who tries this - it actually on dies if you
> "use strict";
>
> >     my %empty;
> >     print %{ $empty{'fake'} }
>
> Yep - makes sense, you can't use an undef or nothing as a hashref -
> must be a real hashref.
>
> >     my %empty;
> >     print values %{ $empty{'fake'} }
>
> Nope - makes no sense
>
> But here is my fav !
>
> THIS WORKS
>
>         use warnings;
>         use strict;
>         my %empty;
>         print values %{ $empty{'fake'} };
>         print %{ $empty{'fake'} };
>
> THIS FAILS
>
>         use warnings;
>         use strict;
>         my %empty;
>         print %{ $empty{'fake'} };
>         print values %{ $empty{'fake'} };
>
> so then try this...
>
>         use warnings;
>         use strict;
>         use Data::Dumper;
>         my %empty;
>         print Dumper(\%empty);
>         print values %{ $empty{'fake'} };
>         print Dumper(\%empty);
>         print %{ $empty{'fake'} };
>
> And you see what is happening !
>
>         $VAR1 = {};
>         $VAR1 = {
>                    'fake' => {}
>          };
>
> So the "values" sort of "forces" it to be a hashref - I guess that in
> that case it returns an lvalue or similar and as values must be on a
> hash it makes it so... maybe?
>
> Scott
> --
> * - *  http://www.osdc.com.au - Open Source Developers Conference * - *
> Scott Penrose
> Anthropomorphic Personification Expert
> http://search.cpan.org/search?author=SCOTT
> scott at cpan.org
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