Section: User Contributed Perl Documentation (3)
Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable
has 'x' => ( isa => 'Int', is => 'ro' );
has 'y' => ( isa => 'Int', is => 'rw' );
The Moose metaclass API
provides a "make_immutable()"
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.
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.
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 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.