/usr/share/php/React/Promise/LazyPromise.php is in php-react-promise 2.1.0-1.
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namespace React\Promise;
class LazyPromise implements CancellablePromiseInterface
{
private $factory;
private $promise;
public function __construct(callable $factory)
{
$this->factory = $factory;
}
public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
{
return $this->promise()->then($onFulfilled, $onRejected, $onProgress);
}
public function cancel()
{
return $this->promise()->cancel();
}
private function promise()
{
if (null === $this->promise) {
try {
$this->promise = resolve(call_user_func($this->factory));
} catch (\Exception $exception) {
$this->promise = new RejectedPromise($exception);
}
}
return $this->promise;
}
}
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