sub _attr {
  my $self = shift;
  my $name = shift;
  return $self->{"_$name"} unless @_;
  $self->{"_$name"} = shift;
}
sub name { shift->_attr(name => @_); }
##</code><code>##

package Parent;
use attribute sub {
  my $self = shift;
  my $name = shift;
  # we have an ordinary hashref for the object
  return \$self->{"_$name"};
}, [qw(city name)];

##</code><code>##

package Child;
use base 'Parent';
use attribute sub {
  my $self = shift;
  my $name = shift;
  # object is arrayref, and the attributes are stored in element 0
  return \$self->[0]->{"_$name"};
};

##</code><code>##

package attribute;
use strict;
use warnings;
sub import {
  my ($self, $sub, $names) = @_;
  my $class = caller();
  no strict 'refs';
  # set the general method
  *{$class . '::_attribute_ref' } = $sub;
  for my $name (@$names) {
    my $string = $class . '::' . $name;
    *{$string} = sub {
      my $self = shift;
      # set method for each attribute
      return ${ $self->_attribute_ref($name) } unless @_;
      ${ $self->_attribute_ref($name) } = shift;
    };
  }
}
1;