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Moose::Cookbook::Basics::Immutable(3)User Contributed Perl Documentationoose::Cookbook::Basics::Immutable(3)



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

VERSION
       version 2.0604

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
       Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in
       Moose and "CONTRIBUTORS" in Moose for details.

COPYRIGHT AND LICENSE
       This software is copyright (c) 2012 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 v5.16.2                                     2012-09-19            Moose::Cookbook::Basics::Immutable(3)