Moose::Meta::Role(3)

NAME
Moose::Meta::Role - The Moose Role metaclass

VERSION
version 2.0604

DESCRIPTION
This class is a subclass of Class::MOP::Module that provides additional Moose-specific functionality.

Its API looks a lot like Moose::Meta::Class, but internally it implements many things differently. This may change in the future.

INHERITANCE
"Moose::Meta::Role" is a subclass of Class::MOP::Module.

METHODS

  Construction

Moose::Meta::Role->initialize($role_name)
    This method creates a new role object with the provided name.

Moose::Meta::Role->combine( [ $role => { ... } ], [ $role ], ... )
    This method accepts a list of array references. Each array reference should contain a role name or Moose::Meta::Role object as its first element. The second element is an optional hash reference. The hash reference can contain "-excludes" and "-alias" keys to control how methods are composed from the role.

    The return value is a new Moose::Meta::Role::Composite that represents the combined roles.

$metarole->composition_class_roles
    When combining multiple roles using "combine", this method is used to obtain a list of role names to be applied to the Moose::Meta::Role::Composite instance returned by "combine". The default implementation returns an empty list. Extensions that need to hook into role combination may wrap this method to return additional role names.

Moose::Meta::Role->create($name, %options)
    This method is identical to the Moose::Meta::Class "create" method.

Moose::Meta::Role->create_anon_role
    This method is identical to the Moose::Meta::Class "create_anon_class" method.

$metarole->is_anon_role
    Returns true if the role is an anonymous role.

$metarole->consumers
    Returns a list of names of classes and roles which consume this role.

  Role application

$metarole->apply( $thing, @options )
    This method applies a role to the given $thing. That can be another Moose::Meta::Role, object, a Moose::Meta::Class object, or a (non-meta) object instance.

    The options are passed directly to the constructor for the appropriate Moose::Meta::Role::Application subclass.

    Note that this will apply the role even if the $thing in question already "does" this role. "does_role" in Moose::Util is a convenient wrapper for finding out if role application is necessary.

  Roles and other roles

$metarole->get_roles
    This returns an array reference of roles which this role does. This list may include duplicates.

$metarole->calculate_all_roles
    This returns a unique list of all roles that this role does, and all the roles that its roles do.

$metarole->does_role($role)
    Given a role name or Moose::Meta::Role object, returns true if this role does the given role.

$metarole->add_role($role)
    Given a Moose::Meta::Role object, this adds the role to the list of roles that the role does.

$metarole->get_excluded_roles_list
    Returns a list of role names which this role excludes.

$metarole->excludes_role($role_name)
    Given a role name, returns true if this role excludes the named role.

$metarole->add_excluded_roles(@role_names)
    Given one or more role names, adds those roles to the list of excluded roles.

  Methods
The methods for dealing with a role's methods are all identical in API and behavior to the same methods in Class::MOP::Class.

$metarole->method_metaclass
    Returns the method metaclass name for the role. This defaults to Moose::Meta::Role::Method.

$metarole->get_method($name)
$metarole->has_method($name)
$metarole->add_method( $name, $body )
$metarole->get_method_list
$metarole->find_method_by_name($name)
    These methods are all identical to the methods of the same name in Class::MOP::Package

  Attributes
As with methods, the methods for dealing with a role's attribute are all identical in API and behavior to the same methods in Class::MOP::Class.

However, attributes stored in this class are not stored as objects. Rather, the attribute definition is stored as a hash reference. When a role is composed into a class, this hash reference is passed directly to the metaclass's "add_attribute" method.

This is quite likely to change in the future.

$metarole->get_attribute($attribute_name)
$metarole->has_attribute($attribute_name)
$metarole->get_attribute_list
$metarole->add_attribute($name, %options)
$metarole->remove_attribute($attribute_name)

  Overload introspection and creation
The methods for dealing with a role's overloads are all identical in API and behavior to the same methods in Class::MOP::Class. Note that these are not particularly useful (yet), because overloads do not participate in role composition.

$metarole->is_overloaded
$metarole->get_overloaded_operator($op)
$metarole->has_overloaded_operator($op)
$metarole->get_overload_list
$metarole->get_all_overloaded_operators
$metarole->add_overloaded_operator($op, $impl)
$metarole->remove_overloaded_operator($op)

  Required methods

$metarole->get_required_method_list
    Returns the list of methods required by the role.

$metarole->requires_method($name)
    Returns true if the role requires the named method.

$metarole->add_required_methods(@names)
    Adds the named methods to the role's list of required methods.

$metarole->remove_required_methods(@names)
    Removes the named methods from the role's list of required methods.

$metarole->add_conflicting_method(%params)
    Instantiate the parameters as a Moose::Meta::Role::Method::Conflicting object, then add it to the required method list.

  Method modifiers
These methods act like their counterparts in Class::MOP::Class and Moose::Meta::Class.

However, method modifiers are simply stored internally, and are not applied until the role itself is applied to a class.

$metarole->add_after_method_modifier($method_name, $method)
$metarole->add_around_method_modifier($method_name, $method)
$metarole->add_before_method_modifier($method_name, $method)
$metarole->add_override_method_modifier($method_name, $method)
    These methods all add an appropriate modifier to the internal list of modifiers.

$metarole->has_after_method_modifiers
$metarole->has_around_method_modifiers
$metarole->has_before_method_modifiers
$metarole->has_override_method_modifier
    Return true if the role has any modifiers of the given type.

$metarole->get_after_method_modifiers($method_name)
$metarole->get_around_method_modifiers($method_name)
$metarole->get_before_method_modifiers($method_name)
    Given a method name, returns a list of the appropriate modifiers for that method.

$metarole->get_override_method_modifier($method_name)
    Given a method name, returns the override method modifier for that method, if it has one.

  Introspection

Moose::Meta::Role->meta
    This will return a Class::MOP::Class instance for this 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.