Perl6Attribute - An example attribute metaclass for Perl 6 style attributes

  package Foo;

  Foo->meta->add_attribute(Perl6Attribute->new('$.foo'));
  Foo->meta->add_attribute(Perl6Attribute->new('@.bar'));    
  Foo->meta->add_attribute(Perl6Attribute->new('%.baz'));    

  sub new  {
      my $class = shift;
      $class->meta->new_object(@_);
  }

This is an attribute metaclass which implements Perl 6 style attributes, including the auto-generating accessors.

This code is very simple, we only need to subclass Class::MOP::Attribute and override &new. Then we just pre-process the attribute name, and create the accessor name and default value based on it.

More advanced features like the handles trait (see A12 in Perl6::Bible) can be accomplished as well doing the same pre-processing approach. This is left as an exercise to the reader though (if you do it, please send me a patch though, and will update this).

Stevan Little <stevan@iinteractive.com>

Yuval Kogman <nothingmuch@woobling.com>

Copyright 2006-2008 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.