/**
* This method evaluates whether the specified object is identical to the current object.
*
* @access public
* @static
* @param IOption\Type $xs the left operand
* @param Core\Type $ys the object to be evaluated
* @return IBool\Type whether the specified object is identical
* to the current object
*/
public static function id(IOption\Type $xs, Core\Type $ys) : IBool\Type
{
if ($ys !== null) {
if ($xs->__typeOf() === $ys->__typeOf()) {
if ($ys instanceof IOption\Some\Type) {
$x = $xs->item();
$y = $ys->item();
if ($x === null) {
return IBool\Type::box($y === null);
} else {
if ($x instanceof Core\Equality\Type) {
return $x->id($y);
}
}
return IBool\Type::box(spl_object_hash($x) === spl_object_hash($y));
} else {
if ($ys instanceof IOption\None\Type) {
return IBool\Type::true();
}
}
}
}
return IBool\Type::false();
}
