Linux Certif

Toute la documentation sur la certification Linux LPI

Moose::Cookbook::Extending::Recipe2.3pm

NAME

Moose::Cookbook::Extending::Recipe2 - Providing a role for the base object class

SYNOPSIS

   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";
   }
 
 

DESCRIPTION

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.

AUTHOR

Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE

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.