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<?php namespace Box\Spout\Common; /** * Class Singleton * Defines a class as a singleton. * * @package Box\Spout\Common */ trait Singleton { protected static $instance; /** * @return static */ final public static function getInstance() { return isset(static::$instance) ? static::$instance : static::$instance = new static; } /** * Singleton constructor. */ final private function __construct() { $this->init(); } /** * Initializes the singleton * @return void */ protected function init() {} final private function __wakeup() {} final private function __clone() {} }