2 package Moose::Meta::Class;
8 use Scalar::Util 'weaken';
10 our $VERSION = '0.03';
12 use base 'Class::MOP::Class';
14 sub construct_instance {
15 my ($class, %params) = @_;
16 my $instance = $params{'__INSTANCE__'} || {};
17 foreach my $attr ($class->compute_all_applicable_attributes()) {
18 my $init_arg = $attr->init_arg();
19 # try to fetch the init arg from the %params ...
21 $val = $params{$init_arg} if exists $params{$init_arg};
22 # if nothing was in the %params, we can use the
23 # attribute's default value (if it has one)
24 if (!defined $val && $attr->has_default) {
25 $val = $attr->default($instance);
28 if ($attr->has_type_constraint) {
29 if ($attr->should_coerce && $attr->type_constraint->has_coercion) {
30 $val = $attr->type_constraint->coercion->coerce($val);
32 (defined($attr->type_constraint->check($val)))
33 || confess "Attribute (" . $attr->name . ") does not pass the type contraint with '$val'";
36 $instance->{$attr->name} = $val;
37 if (defined $val && $attr->is_weak_ref) {
38 weaken($instance->{$attr->name});
52 Moose::Meta::Class - The Moose metaclass
56 This is a subclass of L<Class::MOP::Class> with Moose specific
59 For the most part, the only time you will ever encounter an
60 instance of this class is if you are doing some serious deep
61 introspection. To really understand this class, you need to refer
62 to the L<Class::MOP::Class> documentation.
68 =item B<construct_instance>
70 This provides some Moose specific extensions to this method, you
71 almost never call this method directly unless you really know what
74 This method makes sure to handle the moose weak-ref, type-constraint
75 and type coercion features.
81 All complex software has bugs lurking in it, and this module is no
82 exception. If you find a bug please either email me, or add the bug
87 Stevan Little E<lt>stevan@iinteractive.comE<gt>
89 =head1 COPYRIGHT AND LICENSE
91 Copyright 2006 by Infinity Interactive, Inc.
93 L<http://www.iinteractive.com>
95 This library is free software; you can redistribute it and/or modify
96 it under the same terms as Perl itself.