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