You will learn about polymorphism in this chapter. We use Moose::Role for this. Let's first look at the following example:
package Animal;
use Moose::Role;
requires qw( name food age );
1;
package Bark;
use Moose::Role;
sub bark{
return "Bhoow bhoow";
}
1;
package Dog;
use Moose;
has name => (is => 'ro', isa => 'Str', default=>"xyz");
has food => (is => 'ro', isa => 'Str', default=>"Bread");
has age => (is => 'ro', isa => 'Int', default=>0);
with 'Animal', 'Bark';
1;
use strict;
use warnings;
use feature ':5.10';
use Dog;
my $obj = Dog->new;
if ($obj->DOES('Animal')){
say "Dog is an animal";
say $obj->bark();
}
Dog is an animal
Bhoow bhoow
Bhoow bhoow
Now let's go through this code.
requires qw( name food age ); - It means that anything doing this role must have a name, food and age.
with 'Animal', 'Bark'; - The with keyword is used to apply roles to a class.
$obj->DOES('Animal') - DOES returns true if the class of the object has the role of 'Animal' in it.
Rest of the codes must be clear to you.
