Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable |
Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable
version 2.1605
package Point; use Moose;
has 'x' => ( isa => 'Int', is => 'ro' ); has 'y' => ( isa => 'Int', is => 'rw' );
__PACKAGE__->meta->make_immutable;
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.
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.
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 |