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Man Pages


Manual Reference Pages  -  MOOSE::UTIL (3)

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NAME

Moose::Util - Utilities for working with Moose classes

CONTENTS

VERSION

version 2.1605

SYNOPSIS



  use Moose::Util qw/find_meta does_role search_class_by_role/;

  my $meta = find_meta($object) || die "No metaclass found";

  if (does_role($object, $role)) {
    print "The object can do $role!\n";
  }

  my $class = search_class_by_role($object, FooRole);
  print "Nearest class with FooRole is $class\n";



DESCRIPTION

This module provides a set of utility functions. Many of these functions are intended for use in Moose itself or MooseX modules, but some of them may be useful for use in your own code.

EXPORTED FUNCTIONS

    find_meta($class_or_obj)

This method takes a class name or object and attempts to find a metaclass for the class, if one exists. It will <B>notB> create one if it does not yet exist.

    is_role($package_or_obj)

Returns true if the provided package name or object is a Moose::Role.

does_role($class_or_obj, CW$role_or_obj)

Returns true if $class_or_obj does the given $role_or_obj. The role can be provided as a name or a Moose::Meta::Role object.

The class must already have a metaclass for this to work. If it doesn’t, this function simply returns false.

search_class_by_role($class_or_obj, CW$role_or_obj)

Returns the first class in the class’s precedence list that does $role_or_obj, if any. The role can be either a name or a Moose::Meta::Role object.

The class must already have a metaclass for this to work.

apply_all_roles($applicant, CW@roles)

This function applies one or more roles to the given $applicant. The applicant can be a role name, class name, or object.

The $applicant must already have a metaclass object.

The list of @roles should a list of names or Moose::Meta::Role objects, each of which can be followed by an optional hash reference of options (-excludes and -alias).

ensure_all_roles($applicant, CW@roles)

This function is similar to apply_all_roles, but only applies roles that $applicant does not already consume.

with_traits($class_name, CW@role_names)

This function creates a new class from $class_name with each of @role_names applied. It returns the name of the new class.

get_all_attribute_values($meta, CW$instance)

Returns a hash reference containing all of the $instance’s attributes. The keys are attribute names.

get_all_init_args($meta, CW$instance)

Returns a hash reference containing all of the init_arg values for the instance’s attributes. The values are the associated attribute values. If an attribute does not have a defined init_arg, it is skipped.

This could be useful in cloning an object.

resolve_metaclass_alias($category, CW$name, CW%options)

resolve_metatrait_alias($category, CW$name, CW%options)

Resolves a short name to a full class name. Short names are often used when specifying the metaclass or traits option for an attribute:



    has foo => (
        metaclass => "Bar",
    );



The name resolution mechanism is covered in Metaclass and Trait Name Resolution in Moose.

meta_class_alias($to[, CW$from])

meta_attribute_alias($to[, CW$from])

Create an alias from the class $from (or the current package, if $from is unspecified), so that Metaclass and Trait Name Resolution in Moose works properly.

    english_list(@items)

Given a list of scalars, turns them into a proper list in English (one and two, one, two, three, and four). This is used to help us make nicer error messages.

throw_exception( CW$class_name, CW%arguments_to_exception)

Calls die with an object of Moose::Exception::$class_name, with %arguments_to_exception passed as arguments.

TODO

Here is a list of possible functions to write
discovering original method from modified method
search for origin class of a method or attribute

BUGS

See BUGS in Moose for details on reporting bugs.

AUTHORS

o Stevan Little <stevan.little@iinteractive.com>
o Dave Rolsky <autarch@urth.org>
o Jesse Luehrs <doy@tozt.net>
o Shawn M Moore <code@sartak.org>
o XXXX XXXXX (Yuval Kogman) <nothingmuch@woobling.org>
o Karen Etheridge <ether@cpan.org>
o Florian Ragwitz <rafl@debian.org>
o Hans Dieter Pearcey <hdp@weftsoar.net>
o Chris Prather <chris@prather.org>
o 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.

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