Moose::Cookbook::Extending::Recipe2 - Providing a role for the base object class
package MooseX::Debugging; use strict; use warnings; use Moose::Exporter; use Moose::Util::MetaRole; use MooseX::Debugging::Role::Object; Moose::Exporter->setup_import_methods(); sub init_meta { shift; my %options = @_; Moose::Util::MetaRole::apply_base_object_roles( for_class => $options{for_class}, role => ['MooseX::Debugging::Role::Object'], ); } package MooseX::Debugging::Role::Object; after 'BUILD' => sub { my $self = shift; warn "Made a new " . ref $self . " object\n"; }
In this example, we provide a role for the base object class that adds some simple debugging output. Every time an object is created, it spits out a warning saying what type of object it was.
Obviously, a real debugging role would do something more interesting, but this recipe is all about how we apply that role.
In this case, with the combination of Moose::Exporter and Moose::Util::MetaRole, we ensure that when a module does "use MooseX::Debugging", it automatically gets the debugging role applied to its base object class.
Dave Rolsky <autarch@urth.org>
Copyright 2008 by Infinity Interactive, Inc.
http://www.iinteractive.com
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install Moose, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Moose
CPAN shell
perl -MCPAN -e shell install Moose
For more information on module installation, please visit the detailed CPAN module installation guide.