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Role::Tiny(3)                        User Contributed Perl Documentation                       Role::Tiny(3)



NAME
       Role::Tiny - Roles. Like a nouvelle cuisine portion size slice of Moose.

SYNOPSIS
        package Some::Role;

        use Role::Tiny;

        sub foo { ... }

        sub bar { ... }

        around baz => sub { ... }

        1;

       else where

        package Some::Class;

        use Role::Tiny::With;

        # bar gets imported, but not foo
        with 'Some::Role';

        sub foo { ... }

        # baz is wrapped in the around modifier by Class::Method::Modifiers
        sub baz { ... }

        1;

       If you wanted attributes as well, look at Moo::Role.

DESCRIPTION
       "Role::Tiny" is a minimalist role composition tool.

ROLE COMPOSITION
       Role composition can be thought of as much more clever and meaningful multiple inheritance.  The
       basics of this implementation of roles is:

       • If a method is already defined on a class, that method will not be composed in from the role.

       • If a method that the role "requires" to be implemented is not implemented, role application will
         fail loudly.

       Unlike Class::C3, where the last class inherited from "wins," role composition is the other way
       around, where the class wins. If multiple roles are applied in a single call (single with statement),
       then if any of their provided methods clash, an exception is raised unless the class provides a
       method since this conflict indicates a potential problem.

IMPORTED SUBROUTINES
   requires
        requires qw(foo bar);

       Declares a list of methods that must be defined to compose role.

   with
        with 'Some::Role1';

        with 'Some::Role1', 'Some::Role2';

       Composes another role into the current role (or class via Role::Tiny::With).

       If you have conflicts and want to resolve them in favour of Some::Role1 you can instead write:

        with 'Some::Role1';
        with 'Some::Role2';

       If you have conflicts and want to resolve different conflicts in favour of different roles, please
       refactor your codebase.

   before
        before foo => sub { ... };

       See "before method(s) => sub { ... }" in Class::Method::Modifiers for full documentation.

       Note that since you are not required to use method modifiers, Class::Method::Modifiers is lazily
       loaded and we do not declare it as a dependency. If your Role::Tiny role uses modifiers you must
       depend on both Class::Method::Modifiers and Role::Tiny.

   around
        around foo => sub { ... };

       See "around method(s) => sub { ... }" in Class::Method::Modifiers for full documentation.

       Note that since you are not required to use method modifiers, Class::Method::Modifiers is lazily
       loaded and we do not declare it as a dependency. If your Role::Tiny role uses modifiers you must
       depend on both Class::Method::Modifiers and Role::Tiny.

   after
        after foo => sub { ... };

       See "after method(s) => sub { ... }" in Class::Method::Modifiers for full documentation.

       Note that since you are not required to use method modifiers, Class::Method::Modifiers is lazily
       loaded and we do not declare it as a dependency. If your Role::Tiny role uses modifiers you must
       depend on both Class::Method::Modifiers and Role::Tiny.

SUBROUTINES
   does_role
        if (Role::Tiny::does_role($foo, 'Some::Role')) {
          ...
        }

       Returns true if class has been composed with role.

       This subroutine is also installed as ->does on any class a Role::Tiny is composed into unless that
       class already has an ->does method, so

         if ($foo->does('Some::Role')) {
           ...
         }

       will work for classes but to test a role, one must use ::does_role directly.

       Additionally, Role::Tiny will override the standard Perl "DOES" method for your class. However, if
       "any" class in your class' inheritance heirarchy provides "DOES", then Role::Tiny will not override
       it.

METHODS
   apply_roles_to_package
        Role::Tiny->apply_roles_to_package(
          'Some::Package', 'Some::Role', 'Some::Other::Role'
        );

       Composes role with package.  See also Role::Tiny::With.

   apply_roles_to_object
        Role::Tiny->apply_roles_to_object($foo, qw(Some::Role1 Some::Role2));

       Composes roles in order into object directly.  Object is reblessed into the resulting class.

   create_class_with_roles
        Role::Tiny->create_class_with_roles('Some::Base', qw(Some::Role1 Some::Role2));

       Creates a new class based on base, with the roles composed into it in order.  New class is returned.

SEE ALSO
       Role::Tiny is the attribute-less subset of Moo::Role; Moo::Role is a meta-protocol-less subset of the
       king of role systems, Moose::Role.

       If you don't want method modifiers and do want to be forcibly restricted to a single role application
       per class, Ovid's Role::Basic exists. But Stevan Little (the Moose author) and I don't find the
       additional restrictions to be amazingly helpful in most cases; Role::Basic's choices are more a guide
       to what you should prefer doing, to our mind, rather than something that needs to be enforced.

AUTHOR
       mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>

CONTRIBUTORS
       dg - David Leadbeater (cpan:DGL) <dgl@dgl.cx>

       frew - Arthur Axel "fREW" Schmidt (cpan:FREW) <frioux@gmail.com>

       hobbs - Andrew Rodland (cpan:ARODLAND) <arodland@cpan.org>

       jnap - John Napiorkowski (cpan:JJNAPIORK) <jjn1056@yahoo.com>

       ribasushi - Peter Rabbitson (cpan:RIBASUSHI) <ribasushi@cpan.org>

       chip - Chip Salzenberg (cpan:CHIPS) <chip@pobox.com>

       ajgb - Alex J. G. BurzyAaXski (cpan:AJGB) <ajgb@cpan.org>

       doy - Jesse Luehrs (cpan:DOY) <doy at tozt dot net>

       perigrin - Chris Prather (cpan:PERIGRIN) <chris@prather.org>

       Mithaldu - Christian Walde (cpan:MITHALDU) <walde.christian@googlemail.com>

       ilmari - Dagfinn Ilmari MannsA~Xker (cpan:ILMARI) <ilmari@ilmari.org>

       tobyink - Toby Inkster (cpan:TOBYINK) <tobyink@cpan.org>

COPYRIGHT
       Copyright (c) 2010-2012 the Role::Tiny "AUTHOR" and "CONTRIBUTORS" as listed above.

LICENSE
       This library is free software and may be distributed under the same terms as perl itself.



perl v5.16.2                                     2012-10-25                                    Role::Tiny(3)