Commit | Line | Data |
461dc6d3 |
1 | |
2 | package Moose::Policy::SingleInheritence; |
3 | |
4 | use constant metaclass => 'Moose::Policy::SingleInheritence::MetaClass'; |
5 | |
6 | package Moose::Policy::SingleInheritence::MetaClass; |
7 | use Moose; |
8 | |
9 | extends 'Moose::Meta::Class'; |
10 | |
11 | before 'superclasses' => sub { |
12 | my ($self, @superclasses) = @_; |
13 | confess 'Moose::Policy::SingleInheritence in effect for ' . |
14 | $self->name . ', only single inheritence is allowed' |
15 | if scalar @superclasses > 1; |
16 | }; |
17 | |
18 | 1; |
19 | |
20 | __END__ |
21 | |
22 | =pod |
23 | |
09eff61e |
24 | =head1 NAME |
25 | |
26 | Moose::Policy::SingleInheritence - Why would you ever need more than one? |
27 | |
28 | =head1 SYNOPSIS |
29 | |
30 | package Foo; |
31 | |
32 | use Moose::Policy 'Moose::Policy::SingleInheritence'; |
33 | use Moose; |
34 | |
35 | package Bar; |
36 | |
37 | use Moose::Policy 'Moose::Policy::SingleInheritence'; |
38 | use Moose; |
39 | |
40 | package Foo::Bar; |
41 | |
42 | use Moose::Policy 'Moose::Policy::SingleInheritence'; |
43 | use Moose; |
44 | |
45 | extends 'Foo', 'Bar'; # BOOM!!!! |
46 | |
47 | =head1 DESCRIPTION |
48 | |
49 | This module restricts Moose's C<extends> keyword so that you can only assign |
50 | a single superclass. |
51 | |
52 | This is mostly an example of how you can restrict behavior with meta-policies |
53 | in addition to extending and/or customising them. However, sometimes enforcing |
54 | a policy like this can be a good thing. |
55 | |
56 | =head1 BUGS |
57 | |
58 | All complex software has bugs lurking in it, and this module is no |
59 | exception. If you find a bug please either email me, or add the bug |
60 | to cpan-RT. |
61 | |
62 | =head1 AUTHOR |
63 | |
64 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
65 | |
66 | =head1 COPYRIGHT AND LICENSE |
67 | |
68 | Copyright 2006 by Infinity Interactive, Inc. |
69 | |
70 | L<http://www.iinteractive.com> |
71 | |
72 | This library is free software; you can redistribute it and/or modify |
73 | it under the same terms as Perl itself. |
74 | |
461dc6d3 |
75 | =cut |