Moose::Cookbook::Extending::Recipe2(3pm) - phpMan

Moose::Cookbook::Extending::RecUser(Contributed Perl DocuMoose::Cookbook::Extending::Recipe2(3pm)



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

SYNOPSIS
         package MooseX::Debugging;

         use Moose::Exporter;

         Moose::Exporter->setup_import_methods(
             base_class_roles => ['MooseX::Debugging::Role::Object'],
         );

         package MooseX::Debugging::Role::Object;

         use Moose::Role;

         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.

       There are a few pieces of code worth looking at more closely.

         Moose::Exporter->setup_import_methods(
             base_class_roles => ['MooseX::Debugging::Role::Object'],
         );

       This creates an "import" method in the "MooseX::Debugging" package. Since we are not
       actually exporting anything, we do not pass "setup_import_methods" any parameters related
       to exports, but we need to have an "import" method to ensure that our "init_meta" method
       is called. The "init_meta" is created by "setup_import_methods" for us, since we passed
       the "base_class_roles" parameter. The generated "init_meta" will in turn call
       Moose::Util::MetaRole::apply_base_class_roles.

AUTHOR
       Dave Rolsky <autarch AT urth.org>

COPYRIGHT AND LICENSE
       Copyright 2009 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.



perl v5.10.0                                2009-09-11   Moose::Cookbook::Extending::Recipe2(3pm)

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