What is immutability in Moose in Perl?

In Moose, a postmodern object system for Perl, immutability refers to a property of classes that prevents any further modification to their structure after they have been constructed. This can lead to performance improvements and other benefits, such as thread-safety and easier reasoning about code. When a class is made immutable, its methods and attributes become fixed, and it can be instantiated without the overhead of managing further modifications.

To create an immutable class in Moose, you can use the `MooseX::Immutable::Roles` or `Moose::Meta::Class` with the `-immutable` option. This allows you to declare that the class should be treated as immutable after its initial definition.

package MyImmutableClass; use Moose; # Define attributes has 'name' => ( is => 'ro', isa => 'Str' ); has 'age' => ( is => 'ro', isa => 'Int' ); # Make the class immutable __PACKAGE__->meta->make_immutable; 1;

Moose immutability Perl object system performance thread-safety

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