1Moose::Cookbook::Meta::UWsheyrMeCtoan(t3r)ibuted Perl DoMcouomseen:t:aCtoiooknbook::Meta::WhyMeta(3)
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NAME

6       Moose::Cookbook::Meta::WhyMeta - Welcome to the meta world (Why Go
7       Meta?)
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VERSION

10       version 2.2014
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SUMMARY

13       You might want to read Moose::Manual::MOP if you haven't done so yet.
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15       If you've ever thought "Moose is great, but I wish it did X
16       differently", then you've gone meta. The meta recipes demonstrate how
17       to change and extend the way Moose works by extending and overriding
18       how the meta classes (Moose::Meta::Class, Moose::Meta::Attribute, etc)
19       work.
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21       The metaclass API is a set of classes that describe classes, roles,
22       attributes, etc. The metaclass API lets you ask questions about a
23       class, like "what attributes does it have?", or "what roles does the
24       class do?"
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26       The metaclass system also lets you make changes to a class, for example
27       by adding new methods or attributes.
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29       The interface presented by Moose.pm ("has", "with", "extends") is just
30       a thin layer of syntactic sugar over the underlying metaclass system.
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32       By extending and changing how this metaclass system works, you can
33       create your own Moose variant.
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35   Examples
36       Let's say that you want to add additional properties to attributes.
37       Specifically, we want to add a "label" property to each attribute, so
38       we can write "My::Class->meta()->get_attribute('size')->label()". The
39       first recipe shows how to do this using an attribute trait.
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41       You might also want to add additional properties to your metaclass. For
42       example, if you were writing an ORM based on Moose, you could associate
43       a table name with each class via the class's metaclass object, letting
44       you write "My::Class->meta()->table_name()".
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SEE ALSO

47       Many of the MooseX modules on CPAN implement metaclass extensions. A
48       couple good examples include MooseX::Aliases and MooseX::UndefTolerant.
49       For a more complex example see Fey::ORM or Bread::Board::Declare.
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AUTHORS

52       •   Stevan Little <stevan@cpan.org>
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54       •   Dave Rolsky <autarch@urth.org>
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56       •   Jesse Luehrs <doy@cpan.org>
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58       •   Shawn M Moore <sartak@cpan.org>
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60       •   יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
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62       •   Karen Etheridge <ether@cpan.org>
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64       •   Florian Ragwitz <rafl@debian.org>
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66       •   Hans Dieter Pearcey <hdp@cpan.org>
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68       •   Chris Prather <chris@prather.org>
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70       •   Matt S Trout <mstrout@cpan.org>
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73       This software is copyright (c) 2006 by Infinity Interactive, Inc.
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75       This is free software; you can redistribute it and/or modify it under
76       the same terms as the Perl 5 programming language system itself.
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80perl v5.32.1                      2021-01-27 Moose::Cookbook::Meta::WhyMeta(3)
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