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<?php
declare(strict_types=1);
namespace loophp\combinator\Combinator;
use loophp\combinator\Combinator;
/**
* Class Y.
*/
final class Y extends Combinator
{
* @var callable
private $f;
* Y constructor.
*
* @param callable $f
public function __construct(callable $f)
$this->f = $f;
}
* @return mixed
public function __invoke()
$callable = $this->f;
$f = static function (callable $f) use ($callable): callable {
return $callable(
static function (...$arguments) use ($f) {
return $f($f)(...$arguments);
);
};
return $f($f);
* @return callable
public static function closure(): callable
return static function (callable $f) {
return (new self($f))();
loophp /
combinator
