*/ final class Producer implements Iterator { /** * @use Internal\Producer */ use CallableMaker, Internal\Producer; /** * @param callable(callable(TValue $value): Promise $emit): \Generator $producer * * @throws \Error Thrown if the callable does not return a Generator. */ public function __construct(callable $producer) { $result = $producer($this->callableFromInstanceMethod("emit")); if (!$result instanceof \Generator) { throw new \Error("The callable did not return a Generator"); } $coroutine = new Coroutine($result); $coroutine->onResolve(function ($exception) { if ($this->complete) { return; } if ($exception) { $this->fail($exception); return; } $this->complete(); }); } }