NAME

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

VERSION

       version 1.08

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' };

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.

MooseX::Role::Parameterized::Tutorial

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

       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!

SEE ALSO

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

       <http://sartak.org/2009/05/the-design-of-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://jjnapiorkowski.typepad.com/modern-perl/2010/08/parameterized-roles-and-method-traits-redo.html>

       <http://sartak.org/talks/yapc-asia-2009/(parameterized)-roles/>

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

AUTHOR

       Shawn M Moore <code@sartak.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2008 by Shawn M Moore.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.

CONTRIBUTORS

       •   Karen Etheridge <ether@cpan.org>

       •   Dave Rolsky <autarch@urth.org>

       •   Oliver Charles <oliver.g.charles@googlemail.com>

       •   Jesse Luehrs <doy@tozt.net>

       •   Yuval Kogman <nothingmuch@woobling.org>

       •   Florian Ragwitz <rafl@debian.org>

       •   Robert 'phaylon' Sedlacek <rs@474.at>

       •   Chris Weyl <cweyl@alumni.drew.edu>

       •   Csson <erik.carlsson@live.com>

       •   Todd Hepler <thepler@employees.org>

       •   Ricardo Signes <rjbs@cpan.org>