/**
* Apply function only if the value is not NULL.
*
* @see \monad\Monad::bind($function)
* @see \monad\Chain::emptyChain()
*/
public function continue(callable $function) : Chain
{
return parent::bind(conditionally(negation(is_null), $function));
}
/**
* {@inheritDoc}
*
* @see \monad\Monad::bind($function)
*/
public function bind(callable $function) : Monad
{
$stream = parent::bind($function);
$stream->close_handlers = $this->close_handlers;
return $stream;
}
