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| 1 | <?php |
| 2 | |
| 3 | namespace pvc\struct\tree\node; |
| 4 | |
| 5 | class NodeIdFactory |
| 6 | { |
| 7 | /** |
| 8 | * @var NodeIdFactory |
| 9 | */ |
| 10 | protected static NodeIdFactory $instance; |
| 11 | |
| 12 | /** |
| 13 | * @var non-negative-int |
| 14 | */ |
| 15 | protected static int $nextNodeId; |
| 16 | |
| 17 | /** |
| 18 | * @return non-negative-int |
| 19 | */ |
| 20 | public static function getNextNodeId(): int |
| 21 | { |
| 22 | if (!isset(self::$instance)) { |
| 23 | self::$instance = new NodeIdFactory(); |
| 24 | self::$nextNodeId = 0; |
| 25 | } |
| 26 | return self::$instance::$nextNodeId++; |
| 27 | } |
| 28 | } |