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<?php
namespace parallel;
use Throwable;
/**
* A Future represents the return value or uncaught exception from a task, and exposes an API for cancellation.
*
* The behaviour of a future also allows it to be used as a simple synchronization point even where the task does not
* return a value explicitly.
*
* @examples https://www.php.net/manual/ru/class.parallel-future.php
*/
final class Future{
/* Resolution */
/**
* Shall return (and if necessary wait for) return from task
*
* @return mixed
*
* @throws Future\Error if waiting failed (internal error).
* @throws Future\Error\Killed if \parallel\Runtime executing task was killed.
* @throws Future\Error\Cancelled if task was cancelled.
* @throws Future\Error\Foreign if task raised an unrecognized uncaught exception.
* @throws Throwable Shall rethrow \Throwable uncaught in task
*/
public function value(){}
/* State */
/**
* Shall indicate if the task is completed
* @return bool
*/
public function done() : bool{}
/**
* Shall indicate if the task was cancelled
* @return bool
*/
public function cancelled() : bool{}
/* Cancellation */
/**
* Shall try to cancel the task
* Note: If task is running, it will be interrupted.
* Warning: Internal function calls in progress cannot be interrupted.
*
* @return bool
*
* @throws Future\Error\Killed if \parallel\Runtime executing task was killed.
* @throws Future\Error\Cancelled if task was already cancelled.
*/
public function cancel() : bool{}
}
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