NAME

       Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class immutable

VERSION

       version 2.2207

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.