Result class inspired by Rust

Result.php

<?php

use Exception;

/**
 * @author Cyrill Tekord
 */
final class Result {
	/** @var mixed */
	public $ok;

	/** @var mixed */
	public $error;

	/** @var string */
	public static $exceptionClass = Exception::class;

	private function __construct($ok, $error) {
		$this->ok = $ok;
		$this->error = $error;
	}

	public static function success($ok) {
		return new static($ok, null);
	}

	public static function fail($error) {
		return new static(null, $error);
	}

	private static function panic($error) {
		if ($error instanceof Exception)
			throw $error;

		throw new static::$exceptionClass($error);
	}

	public function isFailed() {
		return $this->error !== null;
	}

	public function isOk() {
		return $this->error === null;
	}

	public function unwrap() {
		if ($this->isFailed())
			static::panic($this->error);

		return $this->ok;
	}

	public function unwrapOrDefault($default) {
		if ($this->isFailed())
			return $default;

		return $this->ok;
	}

	public function unwrapOrElse(callable $valueRetriever) {
		if ($this->isFailed())
			return $valueRetriever();

		return $this->ok;
	}

	public function mapOrDefault(callable $mapper, $default) {
		if ($this->isFailed())
			return $default;

		return $mapper($this->ok);
	}

	public function mapOrElse(callable $mapper, callable $valueRetriever) {
		if ($this->isFailed())
			return $valueRetriever();

		return $mapper($this->ok);
	}
}