protected function __construct($value)
{
if ($value instanceof \IteratorAggregate) {
$value = $value->getIterator();
} else {
if (!$value instanceof \Traversable) {
if (!is_array($value)) {
$value = [$value];
}
$value = new \ArrayIterator($value);
}
}
parent::__construct($value);
}
/**
* Apply function only if the value is not NULL.
*
* @see \monad\Monad::bind($function)
* @see \monad\Chain::emptyChain()
*/
public function continue(callable $function) : Chain
{
return parent::bind(conditionally(negation(is_null), $function));
}
/**
* {@inheritDoc}
*
* This is a closing operation (it calls <code>$this->close()</code> internally).
*
* @see \monad\Monad::extract()
* @see \monad\Stream::close()
*/
public function extract() : array
{
$value = parent::extract();
$this->close();
return $value;
}