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

# [NAME](#NAME)

Moo::Role - Minimal Object Orientation support for Roles

# [SYNOPSIS](#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](#DESCRIPTION)

"Moo::Role" builds upon Role::Tiny, so look there for most of the documentation on how this works (in particular, using "Moo::Role" also enables strict and warnings). The main addition here is extra bits to make the roles more "Moosey;" which is to say, it adds "has".

# [IMPORTED SUBROUTINES](#IMPORTED_SUBROUTINES)

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

## [has](#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](#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](#SUPPORT)

See Moo for support and contact information.

# [AUTHORS](#AUTHORS)

See Moo for authors.

# [COPYRIGHT AND LICENSE](#COPYRIGHT_AND_LICENSE)

See Moo for the copyright and license.

2026-10-26 perl v5.44.0

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Document: Moo::Role(3pm) from perl-moo 2.005005-r3 (Chainguard OS)
Source: https://github.com/moose/Moo