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Moose::Util::MetaRole(3)             User Contributed Perl Documentation            Moose::Util::MetaRole(3)



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

VERSION
       version 2.0604

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.

AUTHOR
       Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in
       Moose and "CONTRIBUTORS" in Moose for details.

COPYRIGHT AND LICENSE
       This software is copyright (c) 2012 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.



perl v5.16.2                                     2012-09-19                         Moose::Util::MetaRole(3)