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Moo::Role(3pm)

Moo::Role(3pm)User Contributed Perl DocumentationMoo::Role(3pm)

Moo::Role - Minimal Object Orientation support for Roles

  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;

"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".

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

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

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

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.

See Moo for support and contact information.

See Moo for authors.

See Moo for the copyright and license.

2023-01-07perl v5.36.0