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