metaclass(3pm) [debian man page]

metaclass(3pm)						User Contributed Perl Documentation					    metaclass(3pm)

NAME

       metaclass - a pragma for installing and using Class::MOP metaclasses

VERSION

       version 2.0603

SYNOPSIS

	 package MyClass;

	 # use Class::MOP::Class
	 use metaclass;

	 # ... or use a custom metaclass
	 use metaclass 'MyMetaClass';

	 # ... or use a custom metaclass
	 # and custom attribute and method
	 # metaclasses
	 use metaclass 'MyMetaClass' => (
	     'attribute_metaclass' => 'MyAttributeMetaClass',
	     'method_metaclass'    => 'MyMethodMetaClass',
	 );

	 # ... or just specify custom attribute
	 # and method classes, and Class::MOP::Class
	 # is the assumed metaclass
	 use metaclass (
	     'attribute_metaclass' => 'MyAttributeMetaClass',
	     'method_metaclass'    => 'MyMethodMetaClass',
	 );

	 # if we'd rather not install a 'meta' method, we can do this
	 use metaclass meta_name => undef;
	 # or if we'd like it to have a different name,
	 use metaclass meta_name => 'my_meta';

DESCRIPTION

       This is a pragma to make it easier to use a specific metaclass and a set of custom attribute and method metaclasses. It also installs a
       "meta" method to your class as well, unless "undef" is passed to the "meta_name" option.

       Note that if you are using Moose, you most likely do not want to be using this - look into Moose::Util::MetaRole instead.

AUTHOR

       Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for
       details.

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 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.

perl v5.14.2							    2012-06-28							    metaclass(3pm)

Moose::Cookbook::Legacy::Table_ClassMetaclass(3)	User Contributed Perl Documentation	  Moose::Cookbook::Legacy::Table_ClassMetaclass(3)

NAME

       Moose::Cookbook::Meta::Table_ClassMetaclass - Adding a "table" attribute to the metaclass

VERSION

       version 2.0604

SYNOPSIS

	 package MyApp::Meta::Class;
	 use Moose;
	 extends 'Moose::Meta::Class';

	 has table => (
	     is  => 'rw',
	     isa => 'Str',
	 );

DESCRIPTION

       WARNING: Subclassing metaclasses (as opposed to providing metaclass traits) is strongly discouraged. This recipe is provided solely for
       reference when encountering older code that does this.

       In this recipe, we'll create a new metaclass which has a "table" attribute. This metaclass is for classes associated with a DBMS table, as
       one might do for an ORM.

       In this example, the table name is just a string, but in a real ORM the table might be an object describing the table.

THE METACLASS

       This really is as simple as the recipe "SYNOPSIS" shows. The trick is getting your classes to use this metaclass, and providing some sort
       of sugar for declaring the table. This is covered in Moose::Cookbook::Extending::Recipe2, which shows how to make a module like "Moose.pm"
       itself, with sugar like "has_table()".

   Using this Metaclass in Practice
       Accessing this new "table" attribute is quite simple. Given a class named "MyApp::User", we could simply write the following:

	 my $table = MyApp::User->meta->table;

       As long as "MyApp::User" has arranged to use "MyApp::Meta::Class" as its metaclass, this method call just works. If we want to be more
       careful, we can check the metaclass's class:

	 $table = MyApp::User->meta->table
	     if MyApp::User->meta->isa('MyApp::Meta::Class');

CONCLUSION

       Creating custom metaclass is trivial. Using it is a little harder, and is covered in other recipes. We will also talk about applying traits
       to a class metaclass, which is a more flexible and cooperative implementation.

SEE ALSO

       Moose::Cookbook::Meta::Recipe5 - The "table" attribute implemented as a metaclass trait

       Moose::Cookbook::Extending::Recipe2 - Acting like Moose.pm and providing sugar Moose-style

AUTHOR

       Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for
       details.

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 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.

perl v5.16.2							    2012-09-19			  Moose::Cookbook::Legacy::Table_ClassMetaclass(3)