David E. Wheeler


Class::Meta::AccessorBuilder - Perl style accessor generation


  package MyApp::TypeDef;

  use strict;
  use Class::Meta::Type;
  use IO::Socket;

  my $type = Class::Meta::Type->add( key     => 'io_socket',
                                     builder => 'default',
                                     desc    => 'IO::Socket object',
                                     name    => 'IO::Socket Object' );


This module provides the default accessor builder for Class::Meta. It builds standard Perl-style accessors. For example, an attribute named "io_socket" would have a single accessor method, io_socket.


Class::Meta::AccessorBuilder create three different types of accessors: read-only, write-only, and read/write. The type of accessor created depends on the value of the authz attribute of the Class::Meta::Attribute for which the accessor is being created.

For example, if the authz is Class::Meta::RDWR, then the method will be able to both read and write the attribute.

  my $value = $obj->io_socket;

If the value of authz is Class::Meta::READ, then the method will not be able to change the value of the attribute:

  my $value = $obj->io_socket;
  $obj->io_socket($value); # Has no effect.

And finally, if the value of authz is Class::Meta::WRITE, then the method will not return the value of the attribute (why anyone would want this is beyond me, but I provide for the sake of completeness):

  my $value = $obj->io_socket;  # Always returns undef.

Data Type Validation

Class::Meta::AccessorBuilder uses all of the validation checks passed to it to validate new values before assigning them to an attribute. It also checks to see if the attribute is required, and if so, adds a check to ensure that its value is never undefined. It does not currently check to ensure that private and protected methods are used only in their appropriate contexts, but may do so in a future release.


This file was packaged with the Class-Meta-0.11 distribution.


Please report all bugs via the CPAN Request Tracker at http://rt.cpan.org/NoAuth/Bugs.html?Dist=Class-Meta.


David Wheeler <david@kineticode.com>



This class contains most of the documentation you need to get started with Class::Meta.


This module generates affordance style accessors.


This class manages the creation of data types.


This class manages Class::Meta class attributes, most of which will have generated accessors.


Copyright (c) 2002-2004, David Wheeler. All Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.