package # hide the package from PAUSE
+ InsideOutClass::Attribute;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.02';
+
+use Carp 'confess';
+use Scalar::Util 'refaddr';
+
+use base 'Class::MOP::Attribute';
+
+sub initialize_instance_slot {
+ my ($self, $meta_instance, $instance, $params) = @_;
+ my $init_arg = $self->init_arg;
+ # try to fetch the init arg from the %params ...
+ my $val;
+ $val = $params->{$init_arg} if exists $params->{$init_arg};
+ # if nothing was in the %params, we can use the
+ # attribute's default value (if it has one)
+ if (!defined $val && defined $self->default) {
+ $val = $self->default($instance);
+ }
+ my $_meta_instance = $self->associated_class->get_meta_instance;
+ $_meta_instance->initialize_slot($instance, $self->name);
+ $_meta_instance->set_slot_value($instance, $self->name, $val);
+}
+
+sub accessor_metaclass { 'InsideOutClass::Method::Accessor' }
+
+package # hide the package from PAUSE
+ InsideOutClass::Method::Accessor;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use Carp 'confess';
+use Scalar::Util 'refaddr';
+
+use base 'Class::MOP::Method::Accessor';
+
+## Method generation helpers
+
+sub generate_accessor_method {
+ my $attr = (shift)->associated_attribute;
+ my $meta_class = $attr->associated_class;
+ my $attr_name = $attr->name;
+ return sub {
+ my $meta_instance = $meta_class->get_meta_instance;
+ $meta_instance->set_slot_value($_[0], $attr_name, $_[1]) if scalar(@_) == 2;
+ $meta_instance->get_slot_value($_[0], $attr_name);
+ };
+}
+
+sub generate_reader_method {
+ my $attr = (shift)->associated_attribute;
+ my $meta_class = $attr->associated_class;
+ my $attr_name = $attr->name;
+ return sub {
+ confess "Cannot assign a value to a read-only accessor" if @_ > 1;
+ $meta_class->get_meta_instance
+ ->get_slot_value($_[0], $attr_name);
+ };
+}
+
+sub generate_writer_method {
+ my $attr = (shift)->associated_attribute;
+ my $meta_class = $attr->associated_class;
+ my $attr_name = $attr->name;
+ return sub {
+ $meta_class->get_meta_instance
+ ->set_slot_value($_[0], $attr_name, $_[1]);
+ };
+}
+
+sub generate_predicate_method {
+ my $attr = (shift)->associated_attribute;
+ my $meta_class = $attr->associated_class;
+ my $attr_name = $attr->name;
+ return sub {
+ defined $meta_class->get_meta_instance
+ ->get_slot_value($_[0], $attr_name) ? 1 : 0;
+ };
+}
+
+package # hide the package from PAUSE
InsideOutClass::Instance;
use strict;
sub create_instance {
my ($self, $class) = @_;
- $self->bless_instance_structure(\(my $instance));
+ bless \(my $instance), $self->_class_name;
}
sub get_slot_value {
my ($self, $instance, $slot_name) = @_;
- $self->{meta}->get_package_variable('%' . $slot_name)->{refaddr $instance};
+ $self->associated_metaclass->get_package_symbol('%' . $slot_name)->{refaddr $instance};
}
sub set_slot_value {
my ($self, $instance, $slot_name, $value) = @_;
- $self->{meta}->get_package_variable('%' . $slot_name)->{refaddr $instance} = $value;
+ $self->associated_metaclass->get_package_symbol('%' . $slot_name)->{refaddr $instance} = $value;
}
sub initialize_slot {
my ($self, $instance, $slot_name) = @_;
- $self->{meta}->add_package_variable(('%' . $slot_name) => {})
- unless $self->{meta}->has_package_variable('%' . $slot_name);
- $self->{meta}->get_package_variable('%' . $slot_name)->{refaddr $instance} = undef;
+ $self->associated_metaclass->add_package_symbol(('%' . $slot_name) => {})
+ unless $self->associated_metaclass->has_package_symbol('%' . $slot_name);
+ $self->associated_metaclass->get_package_symbol('%' . $slot_name)->{refaddr $instance} = undef;
}
sub is_slot_initialized {
my ($self, $instance, $slot_name) = @_;
- return 0 unless $self->{meta}->has_package_variable('%' . $slot_name);
- return exists $self->{meta}->get_package_variable('%' . $slot_name)->{refaddr $instance} ? 1 : 0;
+ return 0 unless $self->associated_metaclass->has_package_symbol('%' . $slot_name);
+ return exists $self->associated_metaclass->get_package_symbol('%' . $slot_name)->{refaddr $instance} ? 1 : 0;
}
1;
package Foo;
- use metaclass 'Class::MOP::Class' => (
- ':instance_metaclass' => 'InsideOutClass::Instance'
+ use metaclass (
+ ':attribute_metaclass' => 'InsideOutClass::Attribute',
+ ':instance_metaclass' => 'InsideOutClass::Instance'
);
__PACKAGE__->meta->add_attribute('foo' => (
well (threading, etc), but this is an example. A real implementation is left as
an exercise to the reader.
-=head1 AUTHOR
+=head1 AUTHORS
Stevan Little E<lt>stevan@iinteractive.comE<gt>
-=head1 SEE ALSO
-
-L<Tie::RefHash::Weak>
+Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>