Exactly, the feature. I feel that I can do more with Perl, after learning Ruby. 
package Person;
sub new {
    my $class = shift;
    my $self = {_name => shift};
    bless $self, $class;
}
1;

package Computer;
sub new {
    my $class = shift;
    my $self = {_name => shift};
    bless $self, $class;
}
package MP3Player;
sub new {
    my $class = shift;
    my $self = {_name => shift};
    bless $self, $class;
}

1;
package main;


$c1 = Computer->new("Dell");
$c2 = Computer->new("Apple");

$m1 = MP3Player->new("IPOD");


$p1 = Person->new("artist");
$p2 = Person->new("jdporter");

use Tie::RefHash;
tie %gift, 'Tie::RefHash';

$gift{$p1} = [$c1];
$gift{$p2} = [$c2,$m1];

foreach my $person  (keys %gift){
    print "Person: ", $person->{_name},"\n";
    foreach my $gift (@{$gift{$person}}){
        print "Gift\t", ref $gift,"\t", $gift->{_name},"\n";
    }
}

[download]
--Artist

In reply to Re^2: Objects as hash keys? by artist
in thread Objects as hash keys? by artist

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.