.
*/
namespace Util;
/**
* Classe astratta per la generazione di oggetti istanziabili una singola volta.
*
* @since 2.3
*/
abstract class Singleton
{
/** @var Singleton Oggetti istanziati */
protected static $instance = [];
/**
* Protected constructor to prevent creating a new instance of the Singleton via the `new` operator from outside of this class.
*/
protected function __construct()
{
}
/**
* Private clone method to prevent cloning of the instance of the Singleton instance.
*/
private function __clone()
{
}
/**
* Private unserialize method to prevent unserializing of the Singleton instance.
*/
private function __wakeup()
{
}
/**
* Restituisce l'istanza della classe in oggetto.
*
* @return Singleton
*/
public static function getInstance()
{
$class = static::class;
if (!isset(self::$instance[$class])) {
self::$instance[$class] = new static();
}
return self::$instance[$class];
}
}