NAME¶
Moose::Cookbook::Basics::Immutable - Making Moose fast by making your class
immutable
VERSION¶
version 2.0603
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.