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<?php declare(strict_types=1); namespace Doctrine\Common; /** * EventArgs is the base class for classes containing event data. * * This class contains no event data. It is used by events that do not pass state * information to an event handler when an event is raised. The single empty EventArgs * instance can be obtained through {@link getEmptyInstance}. */ class EventArgs { /** * Single instance of EventArgs. */ private static EventArgs|null $emptyEventArgsInstance = null; /** * Gets the single, empty and immutable EventArgs instance. * * This instance will be used when events are dispatched without any parameter, * like this: EventManager::dispatchEvent('eventname'); * * The benefit from this is that only one empty instance is instantiated and shared * (otherwise there would be instances for every dispatched in the abovementioned form). * * @link https://msdn.microsoft.com/en-us/library/system.eventargs.aspx * @see EventManager::dispatchEvent */ public static function getEmptyInstance(): EventArgs { return self::$emptyEventArgsInstance ??= new EventArgs(); } }
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