/**
* This method returns a hash set which represents the asymmetric difference between
* the two specified hash sets.
*
* @access public
* @static
* @param IHashSet\Type $xs the first hash set
* @param IHashSet\Type $ys the second hash set
* @return IHashSet\Type a hash set which represents the (asymmetric)
* difference of the two specified hash sets
*/
public static function without(IHashSet\Type $xs, IHashSet\Type $ys) : IHashSet\Type
{
$zs = IHashSet\Type::box($xs->unbox());
$yi = IHashSet\Module::iterator($ys);
foreach ($yi as $y) {
$zs->removeItem($y);
}
return $zs;
}
/**
* This constructor initializes this class with the specified collection.
*
* @access public
* @final
* @param IHashSet\Type $xs the collection to be iterated
*/
public final function __construct(IHashSet\Type $xs)
{
$this->iterator = new \RecursiveIteratorIterator(new IHashSet\RecursiveArrayOnlyIterator($xs->unbox()));
$this->xs = $xs;
$this->i = IInt32\Type::zero();
}
