Moose::Cookbook::Basics::Recipe7.3pm

Langue: en

Autres versions - même langue

Version: 2010-06-11 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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 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.