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copied!<p>You can re-<a href="http://perldoc.perl.org/functions/bless.html" rel="nofollow">bless</a> the returned object to whatever your heart desires:</p> <pre><code>#!/usr/bin/perl package Some::Data; use strict; use warnings; sub new { my $class = shift; bless { @_ } => $class } sub a { $_[0]->{a} } package My::Data; use strict; use warnings; use base 'Some::Data'; sub a_squared { my $self = shift; my $v = $self->a; return $v * $v; } package Some::Parser; use strict; use warnings; sub new { my $class = shift; bless { @_ } => $class } sub parse { return Some::Data->new(a => 3) } package main; use strict; use warnings; my $data = Some::Parser->new->parse; bless $data => 'My::Data'; printf "%.1f\t%.1f\n", $data->a, $data->a_squared; </code></pre> <p>Alternatively, you can use @cjm's idea:</p> <pre><code>#!/usr/bin/perl package Some::Data; use strict; use warnings; sub new { my $class = shift; bless { @_ } => $class } sub a { $_[0]->{a} } package My::Data; use strict; use warnings; use base 'Some::Data'; sub a_squared { my $self = shift; my $v = $self->a; return $v * $v; } package Some::Parser; use strict; use warnings; sub new { my $class = shift; bless { @_ } => $class } sub parse { my $self = shift; return $self->data_class->new(a => 3); } sub data_class { $_[0]->{data_class} } package main; use strict; use warnings; my $data = Some::Parser->new(data_class => 'My::Data')->parse; printf "%.1f\t%.1f\n", $data->a, $data->a_squared; </code></pre>

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