NAME

       Moose::Util::MetaRole - Apply roles to any metaclass, as well as the object base class

VERSION

       version 2.1604

SYNOPSIS

         package MyApp::Moose;

         use Moose ();
         use Moose::Exporter;
         use Moose::Util::MetaRole;

         use MyApp::Role::Meta::Class;
         use MyApp::Role::Meta::Method::Constructor;
         use MyApp::Role::Object;

         Moose::Exporter->setup_import_methods( also => 'Moose' );

         sub init_meta {
             shift;
             my %args = @_;

             Moose->init_meta(%args);

             Moose::Util::MetaRole::apply_metaroles(
                 for             => $args{for_class},
                 class_metaroles => {
                     class       => ['MyApp::Role::Meta::Class'],
                     constructor => ['MyApp::Role::Meta::Method::Constructor'],
                 },
             );

             Moose::Util::MetaRole::apply_base_class_roles(
                 for   => $args{for_class},
                 roles => ['MyApp::Role::Object'],
             );

             return $args{for_class}->meta();
         }

DESCRIPTION

       This utility module is designed to help authors of Moose extensions write extensions that
       are able to cooperate with other Moose extensions. To do this, you must write your
       extensions as roles, which can then be dynamically applied to the caller's metaclasses.

       This module makes sure to preserve any existing superclasses and roles already set for the
       meta objects, which means that any number of extensions can apply roles in any order.

USAGE

       The easiest way to use this module is through Moose::Exporter, which can generate the
       appropriate "init_meta" method for you, and make sure it is called when imported.

FUNCTIONS

       This module provides two functions.

   apply_metaroles( ... )
       This function will apply roles to one or more metaclasses for the specified class. It will
       return a new metaclass object for the class or role passed in the "for" parameter.

       It accepts the following parameters:

       •   for => $name

           This specifies the class or for which to alter the meta classes. This can be a package
           name, or an appropriate meta-object (a Moose::Meta::Class or Moose::Meta::Role).

       •   class_metaroles => \%roles

           This is a hash reference specifying which metaroles will be applied to the class
           metaclass and its contained metaclasses and helper classes.

           Each key should in turn point to an array reference of role names.

           It accepts the following keys:

           class
           attribute
           method
           wrapped_method
           instance
           constructor
           destructor
           error
       •   role_metaroles => \%roles

           This is a hash reference specifying which metaroles will be applied to the role
           metaclass and its contained metaclasses and helper classes.

           It accepts the following keys:

           role
           attribute
           method
           required_method
           conflicting_method
           application_to_class
           application_to_role
           application_to_instance
           application_role_summation
           applied_attribute

   apply_base_class_roles( for => $class, roles => \@roles )
       This function will apply the specified roles to the object's base class.

BUGS

       See "BUGS" in Moose for details on reporting bugs.

AUTHORS

       •   Stevan Little <stevan.little@iinteractive.com>

       •   Dave Rolsky <autarch@urth.org>

       •   Jesse Luehrs <doy@tozt.net>

       •   Shawn M Moore <code@sartak.org>

       •   יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>

       •   Karen Etheridge <ether@cpan.org>

       •   Florian Ragwitz <rafl@debian.org>

       •   Hans Dieter Pearcey <hdp@weftsoar.net>

       •   Chris Prather <chris@prather.org>

       •   Matt S Trout <mst@shadowcat.co.uk>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2006 by Infinity Interactive, Inc..

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.