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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
- {
-
- private static $instance;
- private function __construct()
- {
- }
- public static function instance() : self
- {
- return self::$instance ?: self::$instance = new self();
- }
-
- final public function __clone()
- {
- throw new CloneNotSupportedException();
- }
-
- final public function __sleep() : void
- {
- throw new SerializeNotSupportedException();
- }
-
- final public function __wakeup() : void
- {
- throw new UnserializeNotSupportedException();
- }
- }
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