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".
Moo::Role
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:
use Moo::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".
$self->sha1_hex()
$self->md5_hex()
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.
To install Moo, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Moo
CPAN shell
perl -MCPAN -e shell install Moo
For more information on module installation, please visit the detailed CPAN module installation guide.