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<?php
declare(strict_types=1);
namespace loophp\combinator\Combinator;
use Closure;
use loophp\combinator\Combinator;
/**
* Class U.
*
* @psalm-template ResultType
*/
final class U extends Combinator
{
* @var callable
private $f;
private $g;
* U constructor.
* @psalm-param callable $f
* @psalm-param callable $g
* @param callable $f
* @param callable $g
public function __construct(callable $f, callable $g)
$this->f = $f;
$this->g = $g;
}
* @psalm-return ResultType
public function __invoke()
$f = $this->f;
$g = $this->g;
return $g(($f($f))($g));
* @param callable $a
* @return Closure
public static function on(callable $a): Closure
return static function (callable $b) use ($a) {
return (new self($a, $b))();
};
loophp /
combinator
