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MooseX::Role::Parameterized(3)       User Contributed Perl Documentation      MooseX::Role::Parameterized(3)



NAME
       MooseX::Role::Parameterized - roles with composition parameters

SYNOPSIS
           package Counter;
           use MooseX::Role::Parameterized;

           parameter name => (
               isa      => 'Str',
               required => 1,
           );

           role {
               my $p = shift;

               my $name = $p->name;

               has $name => (
                   is      => 'rw',
                   isa     => 'Int',
                   default => 0,
               );

               method "increment_$name" => sub {
                   my $self = shift;
                   $self->$name($self->$name + 1);
               };

               method "reset_$name" => sub {
                   my $self = shift;
                   $self->$name(0);
               };
           };

           package MyGame::Weapon;
           use Moose;

           with Counter => { name => 'enchantment' };

           package MyGame::Wand;
           use Moose;

           with Counter => { name => 'zapped' };

MooseX::Role::Parameterized::Tutorial
       Stop! If you're new here, please read MooseX::Role::Parameterized::Tutorial for a much gentler
       introduction.

DESCRIPTION
       Your parameterized role consists of two new things: parameter declarations and a "role" block.

       Parameters are declared using the "parameter" keyword which very much resembles "has" in Moose. You
       can use any option that "has" in Moose accepts. The default value for the "is" option is "ro" as
       that's a very common case. Use "is => 'bare'" if you want no accessor. These parameters will get
       their values when the consuming class (or role) uses "with" in Moose. A parameter object will be
       constructed with these values, and passed to the "role" block.

       The "role" block then uses the usual Moose::Role keywords to build up a role. You can shift off the
       parameter object to inspect what the consuming class provided as parameters. You use the parameters
       to customize your role however you wish.

       There are many possible implementations for parameterized roles (hopefully with a consistent enough
       API); I believe this to be the easiest and most flexible design. Coincidentally, Pugs originally had
       an eerily similar design.

       See MooseX::Role::Parameterized::Extending for some tips on how to extend this module.

   Why a parameters object?
       I've been asked several times "Why use a parameter object and not just a parameter hashref? That
       would eliminate the need to explicitly declare your parameters."

       The benefits of using an object are similar to the benefits of using Moose. You get an easy way to
       specify lazy defaults, type constraint, delegation, and so on. You get to use MooseX modules.

       You also get the usual introspective and intercessory abilities that come standard with the
       metaobject protocol. Ambitious users should be able to add traits to the parameters metaclass to
       further customize behavior. Please let me know if you're doing anything viciously complicated with
       this extension. :)

CAVEATS
       You must use this syntax to declare methods in the role block: "method NAME => sub { ... };". This is
       due to a limitation in Perl. In return though you can use parameters in your methods!

AUTHOR
       Shawn M Moore, "sartak@gmail.com"

SEE ALSO
       http://sartak.org/2009/01/parametric-roles-in-perl-5.html <http://sartak .org/2009/01/parametric-
       роли в perl 5.html>

       http://sartak .org/2009/05/the-design-of-parameterized-roles.html <http://sartak .org/2009/05/the-
       проект параметризованного roles.html>

       http://stevan-little .blogspot.com/2009/07/thoughts-on-parameterized-roles.html <http://stevan -
       little.blogspot.com/2009/07/thoughts-on-parameterized-roles.html>

       <http://perldition.org/articles/Parameterized%20Roles%20with%20MooseX:: Declare.pod>

       http://www .modernperlbooks.com/mt/2011/01/the-parametric-role-of-my-mvc-plugin-system.html
       <http://www .modernperlbooks.com/mt/2011/01/the-parametric-role-of-my-mvc-plugin-system.html>

       http://jjnapiorkowski .typepad.com/modern-perl/2010/08/parameterized-roles-and-method-traits-redo.html
       <http://jjnapiorkowski .typepad.com/modern-perl/2010/08/parameterized-roles-and-method-traits-
       redo.html>

       http://sartak .org/talks/yapc-asia-2009 / (параметризовал)-roles/ <http://sartak .org/talks/yapc-
       Азия 2009 / (параметризованный) - роли/!->!->>

       https://github.com/SamuraiJack/JooseX-Role-Parameterized <https://github.com/SamuraiJack/JooseX-Role-
       Parameterized> - this extension ported to JavaScript's Joose

COPYRIGHT AND LICENSE
       Copyright 2007-2010 Infinity Interactive

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.



perl v5.12.5                                     2011-08-22                   MooseX::Role::Parameterized(3)