1Moose::Cookbook::Meta::UWsheyrMeCtoan(t3r)ibuted Perl DoMcouomseen:t:aCtoiooknbook::Meta::WhyMeta(3)
2
3
4

NAME

6       Moose::Cookbook::Meta::WhyMeta - Welcome to the meta world (Why Go
7       Meta?)
8

VERSION

10       version 2.2012
11

SUMMARY

13       You might want to read Moose::Manual::MOP if you haven't done so yet.
14
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.
20
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?"
25
26       The metaclass system also lets you make changes to a class, for example
27       by adding new methods or attributes.
28
29       The interface presented by Moose.pm ("has", "with", "extends") is just
30       a thin layer of syntactic sugar over the underlying metaclass system.
31
32       By extending and changing how this metaclass system works, you can
33       create your own Moose variant.
34
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.
40
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()".
45

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.
50

AUTHORS

52       ·   Stevan Little <stevan.little@iinteractive.com>
53
54       ·   Dave Rolsky <autarch@urth.org>
55
56       ·   Jesse Luehrs <doy@tozt.net>
57
58       ·   Shawn M Moore <code@sartak.org>
59
60       ·   יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
61
62       ·   Karen Etheridge <ether@cpan.org>
63
64       ·   Florian Ragwitz <rafl@debian.org>
65
66       ·   Hans Dieter Pearcey <hdp@weftsoar.net>
67
68       ·   Chris Prather <chris@prather.org>
69
70       ·   Matt S Trout <mst@shadowcat.co.uk>
71

73       This software is copyright (c) 2006 by Infinity Interactive, Inc.
74
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.
77
78
79
80perl v5.30.1                      2020-01-30 Moose::Cookbook::Meta::WhyMeta(3)
Impressum