Moose::Cookbook::BasicUsermContributed)Moose::Cookbook::Basics::Immutable(3pm)
NAME
Moose::Cookbook::Basics::Immutable - Making Moose fast by making your
class immutable
VERSION
version 2.2200
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
• Stevan Little <stevan@cpan.org>
• Dave Rolsky <autarch@urth.org>
• Jesse Luehrs <doy@cpan.org>
• Shawn M Moore <sartak@cpan.org>
• יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
• Karen Etheridge <ether@cpan.org>
• Florian Ragwitz <rafl@debian.org>
• Hans Dieter Pearcey <hdp@cpan.org>
• Chris Prather <chris@prather.org>
• Matt S Trout <mstrout@cpan.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.
perl v5.34.0 2022-Moose::Cookbook::Basics::Immutable(3pm)
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