Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable



NAME

Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable


VERSION

version 2.1605


SYNOPSIS

  package Point;
  use Moose;
  has 'x' => ( isa => 'Int', is => 'ro' );
  has 'y' => ( isa => 'Int', is => 'rw' );
  __PACKAGE__->meta->make_immutable;


DESCRIPTION

The Moose metaclass API provides a make_immutable() method. Calling this method does two things to your class. First, it makes it faster. In particular, object construction and destruction are effectively ``inlined'' in your class, and no longer invoke the meta API.

Second, you can no longer make changes via the metaclass API, such as adding attributes. In practice, this won't be a problem, as you rarely need to do this after first loading the class.


CONCLUSION

We strongly recommend you make your classes immutable. It makes your code much faster, with a small compile-time cost. This will be especially noticeable when creating many objects.


AUTHORS


COPYRIGHT AND LICENSE

This software is copyright (c) 2006 by Infinity Interactive, Inc.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

 Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable