You can look at my Class::BuildMethods. It's extremely lightweight. The nice thing about it is you can slowly convert your objects to inside-out objects regardless of the implementation you currently use. This gives you a migration path.

use Data::UUID;
use Class::BuildMethods 
  'name',
  rank => { default  => 'private' },
  age  => { validate => sub {
      my ($self, $age) = @_;
      die "Must be 18 or over" unless $age >= 18;
    },
  },
  id => {
    default  => Data::UUID->new->get_str,
    validate => sub { die "id() is readonly" }
  };

sub new { bless [], shift }

sub foo {
    my $self = shift;
    return $self->[0] unless @_;
    # lots of horribly complicated code
    $self->[0] = shift;
    return $self;
}
[download]

In the above example, you have a blessed array reference, but it can be a blessed typeglob, hashref, whatever. You can also add your own methods which are independent of the inside-out attributes that BuildMethods defines. This allows you to take an existing class and gradually encapsulate methods one at a time.

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