TaskQueueInterface.php
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TaskQueueInterface.php
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	<?php

	declare(strict_types=1);

	namespace GuzzleHttp\Promise;

	interface TaskQueueInterface
	{
	/**
	* Returns true if the queue is empty.
	*/
	public function isEmpty(): bool;

	/**
	* Adds a task to the queue that will be executed the next time run is
	* called.
	*/
	public function add(callable $task): void;

	/**
	* Execute all of the pending task in the queue.
	*/
	public function run(): void;
	}