use warnings;
use Scalar::Util 'blessed';
+use Carp 'confess';
use MRO::Compat;
sub new {
my $class = shift;
- my %args = @_;
+ my %args = @_;
$args{attributes} = {};
$args{superclasses} = do {
@{ $self->{superclasses} };
}
+sub add_method {
+ my $self = shift;
+ my $name = shift;
+ my $code = shift;
+
+ my $pkg = $self->name;
+
+ no strict 'refs';
+ *{ $pkg . '::' . $name } = $code;
+}
+
sub add_attribute {
my $self = shift;
my $attr = shift;
sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } }
+sub clone_object {
+ my $class = shift;
+ my $instance = shift;
+
+ (blessed($instance) && $instance->isa($class->name))
+ || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)";
+
+ $class->clone_instance($instance, @_);
+}
+
+sub clone_instance {
+ my ($class, $instance, %params) = @_;
+
+ (blessed($instance))
+ || confess "You can only clone instances, ($instance) is not a blessed instance";
+
+ my $clone = bless { %$instance }, ref $instance;
+
+ foreach my $attr ($class->compute_all_applicable_attributes()) {
+ if ( defined( my $init_arg = $attr->init_arg ) ) {
+ if (exists $params{$init_arg}) {
+ $clone->{ $attr->name } = $params{$init_arg};
+ }
+ }
+ }
+
+ return $clone;
+
+}
+
+
1;
__END__
Returns the list of classes in method dispatch order, with duplicates removed.
+=head2 clone_object Instance -> Instance
+
+Clones the given C<Instance> which must be an instance governed by this
+metaclass.
+
+=head2 clone_instance Instance, Parameters -> Instance
+
+Clones the given C<Instance> and sets any additional parameters.
+
=cut