package Base;

sub new {
   my $package = shift;
   my $id = shift;

   return bless {
      id => $id,
   }, $package;
}

sub id {
   my ($self, $id) = @_;

   $self->{id} = $id if defined $id;
   return $self->{id};
}

1;

package NameDecorator;

sub new {
   my $package = shift;
   my $base_or_decorated = shift;
   
   my $self = $base_or_decorated->new(@_);
   $self->{name} = undef;

   return $self->{name};
}

sub name {
   my ($self, $name) = @_;

   $self->{name} = $name if defined $name;
   return $self->{name};
}

1;

...do the same for an AgeDecorator

##</code><code>##

use Base;
use NameDecorator;
use AgeDecorator;

my $decorated = AgeDecorator->new(NameDecorator->new(Base->new('id1')));
$decorated->name('Edith');
$decorated->age(93);

##</code><code>##

package NameProto;

use strict;
use base qw(Base::Decorator);

sub new {
	my $self = shift->SUPER::new(@_);
	$self->{age} = 0;
	
	no strict 'refs';
	my $package = ref($self->{base});
	*{$package . '::name'} = sub {
		my ($self, $name) = @_;
		
		$self->{name} = $name if defined $name;
		return $self->{name};
	};
	
	return bless $self, $package;
}

sub name {
	return shift->{base}->name(@_);
}

1;