—=pod
=head1 NAME
Moose::Cookbook::Basics::Recipe7 - Making Moose fast with immutable
=head1 SYNOPSIS
package Point;
use Moose;
has 'x' => ( isa => 'Int', is => 'ro' );
has 'y' => ( isa => 'Int', is => 'rw' );
__PACKAGE__->meta->make_immutable;
=head1 DESCRIPTION
The Moose metaclass API provides a C<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.
=head1 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.
=head1 AUTHOR
Dave Rolsky E<lt>autarch@urth.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 by Infinity Interactive, Inc.
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut