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

Authors

       •   Stevan Little <stevan@cpan.org>

       •   Dave Rolsky <autarch@urth.org>

       •   Jesse Luehrs <doy@cpan.org>

       •   Shawn M Moore <sartak@cpan.org>

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

       •   Karen Etheridge <ether@cpan.org>

       •   Florian Ragwitz <rafl@debian.org>

       •   Hans Dieter Pearcey <hdp@cpan.org>

       •   Chris Prather <chris@prather.org>

       •   Matt S Trout <mstrout@cpan.org>

Bugs

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

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

ConstructionMoose::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.

   Roleapplication$metarole->apply($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.

   Rolesandotherroles$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::Class

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

       $metarole->is_overloaded$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)Requiredmethods$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.

   Methodmodifiers
       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 or object.

       $metarole->add_after_method_modifier($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.

   IntrospectionMoose::Meta::Role->meta

       This will return a Class::MOP::Class instance for this class.

Name

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

Version

       version 2.2207

See Also