{
        package Row;
        use Moose;
        use Moose::Util::TypeConstraints;

        has 'row' => (
                traits          => ['Array'],
                is              => 'ro',
                isa             => 'ArrayRef[Cell]',
                required        => 1,
                default         => sub { [] },
                handles         => {
                        pushCell => 'push',
                        getCell  => 'get',
                        allCells => 'elements',
                },
        );
}