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NAMEMoose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable
package Point; use Moose; has 'x' => ( isa => 'Int', is => 'ro' ); has 'y' => ( isa => 'Int', is => 'rw' ); __PACKAGE__->meta->make_immutable;
DESCRIPTIONThe Moose metaclass
APIprovides 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
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.
CONCLUSIONWe 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.
- Stevan Little <email@example.com>
- Dave Rolsky <firstname.lastname@example.org>
- Jesse Luehrs <email@example.com>
- Shawn M Moore <firstname.lastname@example.org>
- יובל קוג'מן (Yuval Kogman) <email@example.com>
- Karen Etheridge <firstname.lastname@example.org>
- Florian Ragwitz <email@example.com>
- Hans Dieter Pearcey <firstname.lastname@example.org>
- Chris Prather <email@example.com>
- Matt S Trout <firstname.lastname@example.org>
COPYRIGHT AND LICENSEThis 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.