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 if (exists $params{$init_arg}) {
22 $val = $params{$init_arg};
25 # skip it if it's lazy
26 next if $attr->is_lazy;
27 # and die if it is required
28 confess "Attribute (" . $attr->name . ") is required"
31 # if nothing was in the %params, we can use the
32 # attribute's default value (if it has one)
33 if (!defined $val && $attr->has_default) {
34 $val = $attr->default($instance);
37 if ($attr->has_type_constraint) {
38 if ($attr->should_coerce && $attr->type_constraint->has_coercion) {
39 $val = $attr->type_constraint->coercion->coerce($val);
41 (defined($attr->type_constraint->check($val)))
42 || confess "Attribute (" . $attr->name . ") does not pass the type contraint with '$val'";
45 $instance->{$attr->name} = $val;
46 if (defined $val && $attr->is_weak_ref) {
47 weaken($instance->{$attr->name});
61 Moose::Meta::Class - The Moose metaclass
65 This is a subclass of L<Class::MOP::Class> with Moose specific
68 For the most part, the only time you will ever encounter an
69 instance of this class is if you are doing some serious deep
70 introspection. To really understand this class, you need to refer
71 to the L<Class::MOP::Class> documentation.
77 =item B<construct_instance>
79 This provides some Moose specific extensions to this method, you
80 almost never call this method directly unless you really know what
83 This method makes sure to handle the moose weak-ref, type-constraint
84 and type coercion features.
90 All complex software has bugs lurking in it, and this module is no
91 exception. If you find a bug please either email me, or add the bug
96 Stevan Little E<lt>stevan@iinteractive.comE<gt>
98 =head1 COPYRIGHT AND LICENSE
100 Copyright 2006 by Infinity Interactive, Inc.
102 L<http://www.iinteractive.com>
104 This library is free software; you can redistribute it and/or modify
105 it under the same terms as Perl itself.