Deferred.php

<?php

namespace React\Promise;


/**
 * @template T
 */
final class Deferred {
    
    /**
     * @var PromiseInterface<T>
     */
    private $promise;
    
    /** @var callable(T):void */
    private $resolveCallback;
    
    /** @var callable(\Throwable):void */
    private $rejectCallback;
    
    /**
     * @param (callable(callable(T):void,callable(\Throwable):void):void)|null $canceller
     */
    public function __construct(?callable $canceller = null) {
        $this->promise = new Promise(function ($resolve, $reject) : void {
            $this->resolveCallback = $resolve;
            $this->rejectCallback = $reject;
        }, $canceller);
    }
    
    /**
     * @return PromiseInterface<T>
     */
    public function promise() : PromiseInterface {
        return $this->promise;
    }
    
    /**
     * @param T $value
     */
    public function resolve($value) : void {
        ($this->resolveCallback)($value);
    }
    public function reject(\Throwable $reason) : void {
        ($this->rejectCallback)($reason);
    }

}