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<?php
namespace Amp;
/**
* Defines an asynchronous iterator over a set of values that is designed to be used within a coroutine.
*
* @template-covariant TValue
*/
interface Iterator
{
/**
* Succeeds with true if an emitted value is available by calling getCurrent() or false if the iterator has
* resolved. If the iterator fails, the returned promise will fail with the same exception.
*
* @return Promise
* @psalm-return Promise<bool>
*
* @throws \Error If the prior promise returned from this method has not resolved.
* @throws \Throwable The exception used to fail the iterator.
*/
public function advance(): Promise;
/**
* Gets the last emitted value or throws an exception if the iterator has completed.
*
* @return mixed Value emitted from the iterator.
* @psalm-return TValue
*
* @throws \Error If the iterator has resolved or advance() was not called before calling this method.
* @throws \Throwable The exception used to fail the iterator.
*/
public function getCurrent();
}