-
-package # hide the package from PAUSE
- ArrayBasedStorage::Attribute;
-
-use strict;
-use warnings;
-
-use Carp 'confess';
-
-our $VERSION = '0.01';
-
-use base 'Class::MOP::Attribute';
-
-sub initialize_instance_slot {
- my ($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);
- }
- $meta_instance->set_slot_value($instance, $self->name, $val);
-}
-
-sub generate_accessor_method {
- my $self = shift;
- my $meta_class = $self->associated_class;
- my $attr_name = $self->name;
- return sub {
- my $meta_instance = $meta_class->initialize(Scalar::Util::blessed($_[0]))->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 $self = shift;
- my $meta_class = $self->associated_class;
- my $attr_name = $self->name;
- return sub {
- confess "Cannot assign a value to a read-only accessor" if @_ > 1;
- $meta_class->initialize(Scalar::Util::blessed($_[0]))
- ->get_meta_instance
- ->get_slot_value($_[0], $attr_name);
- };
-}
-
-sub generate_writer_method {
- my $self = shift;
- my $meta_class = $self->associated_class;
- my $attr_name = $self->name;
- return sub {
- $meta_class->initialize(Scalar::Util::blessed($_[0]))
- ->get_meta_instance
- ->set_slot_value($_[0], $attr_name, $_[1]);
- };
-}
-
-sub generate_predicate_method {
- my $self = shift;
- my $meta_class = $self->associated_class;
- my $attr_name = $self->name;
- return sub {
- defined $meta_class->initialize(Scalar::Util::blessed($_[0]))
- ->get_meta_instance
- ->get_slot_value($_[0], $attr_name) ? 1 : 0;
- };
-}
-
+
package # hide the package from PAUSE
ArrayBasedStorage::Instance;
use strict;
use warnings;
+use Scalar::Util qw/refaddr/;
use Carp 'confess';
our $VERSION = '0.01';
+my $unbound = \'empty-slot-value';
use base 'Class::MOP::Instance';
my ($class, $meta, @attrs) = @_;
my $self = $class->SUPER::new($meta, @attrs);
my $index = 0;
- $self->{slot_index_map} = { map { $_ => $index++ } $self->get_all_slots };
+ $self->{'%!slot_index_map'} = { map { $_ => $index++ } $self->get_all_slots };
return $self;
}
sub create_instance {
my $self = shift;
- $self->bless_instance_structure([]);
+ my $instance = $self->bless_instance_structure([]);
+ $self->initialize_all_slots($instance);
+ return $instance;
+}
+
+sub clone_instance {
+ my ($self, $instance) = shift;
+ $self->bless_instance_structure([ @$instance ]);
}
# operations on meta instance
-sub get_slot_index_map { (shift)->{slot_index_map} }
+sub get_slot_index_map { (shift)->{'%!slot_index_map'} }
+
+sub initialize_slot {
+ my ($self, $instance, $slot_name) = @_;
+ $self->set_slot_value($instance, $slot_name, $unbound);
+}
+
+sub deinitialize_slot {
+ my ( $self, $instance, $slot_name ) = @_;
+ $self->set_slot_value($instance, $slot_name, $unbound);
+}
sub get_all_slots {
my $self = shift;
- return sort @{$self->{slots}};
+ return sort $self->SUPER::get_all_slots;
}
sub get_slot_value {
my ($self, $instance, $slot_name) = @_;
- return $instance->[ $self->{slot_index_map}->{$slot_name} ];
+ my $value = $instance->[ $self->{'%!slot_index_map'}->{$slot_name} ];
+ return $value unless ref $value;
+ refaddr $value eq refaddr $unbound ? undef : $value;
}
sub set_slot_value {
my ($self, $instance, $slot_name, $value) = @_;
- $instance->[ $self->{slot_index_map}->{$slot_name} ] = $value;
-}
-
-sub initialize_slot {
- my ($self, $instance, $slot_name) = @_;
- $instance->[ $self->{slot_index_map}->{$slot_name} ] = undef;
+ $instance->[ $self->{'%!slot_index_map'}->{$slot_name} ] = $value;
}
sub is_slot_initialized {
- # NOTE:
- # maybe use CLOS's *special-unbound-value*
- # for this ?
- confess "Cannot really tell this for sure";
+ my ($self, $instance, $slot_name) = @_;
+ # NOTE: maybe use CLOS's *special-unbound-value* for this?
+ my $value = $instance->[ $self->{'%!slot_index_map'}->{$slot_name} ];
+ return 1 unless ref $value;
+ refaddr $value eq refaddr $unbound ? 0 : 1;
}
1;
in fact, they both share the exact same test suite, with
the only difference being the Instance metaclass they use.
-=head1 AUTHOR
+=head1 AUTHORS
Stevan Little E<lt>stevan@iinteractive.comE<gt>
+Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
+
=head1 SEE ALSO
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>