/**
* Constructor
*
* @param int $index
* @param int $size
* @param parent $backing
*/
public function __construct($index, $size, parent $backing)
{
parent::__construct($backing->variables, $backing->parent);
$this->index = $index;
$this->last = $size - 1;
$this->backing = $backing;
}
/**
* Constructor
*
* @param string $key
* @param bool $first
* @param parent $backing
*/
public function __construct($key, $first, parent $backing)
{
parent::__construct($backing->variables, $backing->parent);
$this->key = $key;
$this->first = $first;
$this->backing = $backing;
}