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<?php declare(strict_types = 1); namespace DASPRiD\Enum; use DASPRiD\Enum\Exception\CloneNotSupportedException; use DASPRiD\Enum\Exception\SerializeNotSupportedException; use DASPRiD\Enum\Exception\UnserializeNotSupportedException; final class NullValue { /** * @var self */ private static $instance; private function __construct() { } public static function instance() : self { return self::$instance ?: self::$instance = new self(); } /** * Forbid cloning enums. * * @throws CloneNotSupportedException */ final public function __clone() { throw new CloneNotSupportedException(); } /** * Forbid serializing enums. * * @throws SerializeNotSupportedException */ final public function __sleep() : void { throw new SerializeNotSupportedException(); } /** * Forbid unserializing enums. * * @throws UnserializeNotSupportedException */ final public function __wakeup() : void { throw new UnserializeNotSupportedException(); } }