File Coverage

blib/lib/Data/Object/Undef.pm

Criterion	Covered	Total	%
statement	26	26	100.0
branch	2	4	50.0
condition	2	6	33.3
subroutine	9	9	100.0
pod	0	3	0.0
total	39	48	81.2

# ABSTRACT: An Undef Object for Perl 5
package Data::Object::Undef;

use 5.010;

use Carp 'confess';
use Scalar::Util 'blessed';
use Data::Object 'deduce_deep', 'detract_deep';
use Data::Object::Class 'with';

with 'Data::Object::Role::Undef';

use overload (
    'bool'   => 'data',
    '""'     => 'data',
    '~~'     => 'data',
    fallback => 1,
);

our $VERSION = '0.20'; # VERSION

sub new {
    my $class = shift;
    my $data  = shift;

    $class = ref($class) || $class;
    unless (blessed($data) && $data->isa($class)) {
        confess 'Type Instantiation Error: Not an Undefined value'
            if defined $data;
    }

    return bless \$data, $class;
}

sub data {
    goto &detract;
}

around 'defined' => sub {
    my ($orig, $self, @args) = @_;
    my $result = $self->$orig(@args);
    return scalar deduce_deep $result;
};

sub detract {
    return detract_deep shift;
}

1;

__END__