Moose::Cookbook(3) How to cook a Moose

VERSION

version 2.1605

DESCRIPTION

The Moose cookbook is a series of recipes showing various Moose features. Most recipes present some code demonstrating some feature, and then explain the details of the code.

You should probably read the Moose::Manual first. The manual explains Moose concepts without being too code-heavy.

RECIPES

Basic Moose

These recipes will give you a good overview of Moose's capabilities, starting with simple attribute declaration, and moving on to more powerful features like laziness, types, type coercion, method modifiers, and more.
Moose::Cookbook::Basics::Point_AttributesAndSubclassing
A simple Moose-based class. Demonstrates basic Moose attributes and subclassing.
Moose::Cookbook::Basics::BankAccount_MethodModifiersAndSubclassing
A slightly more complex Moose class. Demonstrates using a method modifier in a subclass.
Moose::Cookbook::Basics::BinaryTree_AttributeFeatures
Demonstrates several attribute features, including types, weak references, predicates (``does this object have a foo?''), defaults, laziness, and triggers.
Moose::Cookbook::Basics::Company_Subtypes
Introduces the creation and use of custom types, a "BUILD" method, and the use of "override" in a subclass. This recipe also shows how to model a set of classes that could be used to model companies, people, employees, etc.
Moose::Cookbook::Basics::HTTP_SubtypesAndCoercion
This recipe covers more subtype creation, including the use of type coercions.
Moose::Cookbook::Basics::Immutable
Making a class immutable greatly increases the speed of accessors and object construction.
Moose::Cookbook::Basics::BinaryTree_BuilderAndLazyBuild - Builder methods and lazy_build
The builder feature provides an inheritable and role-composable way to provide a default attribute value.
Moose::Cookbook::Basics::Genome_OverloadingSubtypesAndCoercion
Demonstrates using operator overloading, coercion, and subtypes to model how eye color is determined during reproduction.
Moose::Cookbook::Basics::Person_BUILDARGSAndBUILD
This recipe demonstrates the use of "BUILDARGS" and "BUILD" to hook into object construction.
Moose::Cookbook::Basics::DateTime_ExtendingNonMooseParent
In this recipe, we make a Moose-based subclass of DateTime, a module which does not use Moose itself.
Moose::Cookbook::Basics::Document_AugmentAndInner
Demonstrates the use of "augment" method modifiers, a way of turning the usual method overriding style ``inside-out''.

Moose Roles

These recipes will show you how to use Moose roles.
Moose::Cookbook::Roles::Comparable_CodeReuse
Demonstrates roles, which are also sometimes known as traits or mix-ins. Roles provide a method of code re-use which is orthogonal to subclassing.
Moose::Cookbook::Roles::Restartable_AdvancedComposition
Sometimes you just want to include part of a role in your class. Sometimes you want the whole role but one of its methods conflicts with one in your class. With method exclusion and aliasing, you can work around these problems.
Moose::Cookbook::Roles::ApplicationToInstance
In this recipe, we apply a role to an existing object instance.

Meta Moose

These recipes show you how to write your own meta classes, which lets you extend the object system provided by Moose.
Moose::Cookbook::Meta::WhyMeta
If you're wondering what all this ``meta'' stuff is, and why you should care about it, read this ``recipe''.
Moose::Cookbook::Meta::Labeled_AttributeTrait
Extending Moose's attribute metaclass is a great way to add functionality. However, attributes can only have one metaclass. Applying roles to the attribute metaclass lets you provide composable attribute functionality.
Moose::Cookbook::Meta::Table_MetaclassTrait
This recipe takes the class metaclass we saw in the previous recipe and reimplements it as a metaclass trait.
Moose::Cookbook::Meta::PrivateOrPublic_MethodMetaclass
This recipe shows a custom method metaclass that implements making a method private.
Moose::Cookbook::Meta::GlobRef_InstanceMetaclass
This recipe shows an example of how you create your own meta-instance class. The meta-instance determines the internal structure of object instances and provide access to attribute slots.

In this particular instance, we use a blessed glob reference as the instance instead of a blessed hash reference.

Hooking into immutabilization (TODO)
Moose has a feature known as ``immutabilization''. By calling "__PACKAGE__->meta()->make_immutable()" after defining your class (attributes, roles, etc), you tell Moose to optimize things like object creation, attribute access, and so on.

If you are creating your own metaclasses, you may need to hook into the immutabilization system. This cuts across a number of spots, including the metaclass class, meta method classes, and possibly the meta-instance class as well.

This recipe shows you how to write extensions which immutabilize properly.

Extending Moose

These recipes cover some more ways to extend Moose, and will be useful if you plan to write your own "MooseX" module.
Moose::Cookbook::Extending::ExtensionOverview
There are quite a few ways to extend Moose. This recipe provides an overview of each method, and provides recommendations for when each is appropriate.
Moose::Cookbook::Extending::Debugging_BaseClassRole
Many base object class extensions can be implemented as roles. This example shows how to provide a base object class debugging role that is applied to any class that uses a notional "MooseX::Debugging" module.
Moose::Cookbook::Extending::Mooseish_MooseSugar
This recipe shows how to provide a replacement for "Moose.pm". You may want to do this as part of the API for a "MooseX" module, especially if you want to default to a new metaclass class or base object class.

SNACKS

Moose::Cookbook::Snack::Keywords
Moose::Cookbook::Snack::Types

Legacy Recipes

These cover topics that are no longer considered best practice. We've kept them in case in you encounter these usages in the wild.
Moose::Cookbook::Legacy::Labeled_AttributeMetaclass
Moose::Cookbook::Legacy::Table_ClassMetaclass
Moose::Cookbook::Legacy::Debugging_BaseClassReplacement

AUTHORS

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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