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;
}
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.