EventArgs.php
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EventArgs.php
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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();
	}
	}