Moose::Cookbook::Basics::Recipe7(3pm)
NAME
Moose::Cookbook::Basics::Recipe7 - Making Moose fast with immutable
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.
AUTHOR
Dave Rolsky <autarch@urth.org>
COPYRIGHT AND LICENSE
Copyright 2006-2010 by Infinity Interactive, Inc.
<http://www.iinteractive.com>
- This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.