Graham Knop > Moo-2.002004 > Moo::Role

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Module Version: 2.002004   Source   Latest Release: Moo-2.002005

NAME ^

Moo::Role - Minimal Object Orientation support for Roles

SYNOPSIS ^

  package My::Role;

  use Moo::Role;
  use strictures 2;

  sub foo { ... }

  sub bar { ... }

  has baz => (
    is => 'ro',
  );

  1;

And elsewhere:

  package Some::Class;

  use Moo;
  use strictures 2;

  # bar gets imported, but not foo
  with('My::Role');

  sub foo { ... }

  1;

DESCRIPTION ^

Moo::Role builds upon Role::Tiny, so look there for most of the documentation on how this works. The main addition here is extra bits to make the roles more "Moosey;" which is to say, it adds "has".

IMPORTED SUBROUTINES ^

See "IMPORTED SUBROUTINES" in Role::Tiny for all the other subroutines that are imported by this module.

has

  has attr => (
    is => 'ro',
  );

Declares an attribute for the class to be composed into. See "has" in Moo for all options.

CLEANING UP IMPORTS ^

Moo::Role cleans up its own imported methods and any imports declared before the use Moo::Role statement automatically. Anything imported after use Moo::Role will be composed into consuming packages. A package that consumes this role:

  package My::Role::ID;

  use Digest::MD5 qw(md5_hex);
  use Moo::Role;
  use Digest::SHA qw(sha1_hex);

  requires 'name';

  sub as_md5  { my ($self) = @_; return md5_hex($self->name);  }
  sub as_sha1 { my ($self) = @_; return sha1_hex($self->name); }

  1;

..will now have a $self->sha1_hex() method available to it that probably does not do what you expect. On the other hand, a call to $self->md5_hex() will die with the helpful error message: Can't locate object method "md5_hex".

See "CLEANING UP IMPORTS" in Moo for more details.

SUPPORT ^

See Moo for support and contact information.

AUTHORS ^

See Moo for authors.

COPYRIGHT AND LICENSE ^

See Moo for the copyright and license.

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