| 1 | <?php |
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| 22 | abstract class AbstractSet implements Countable, IteratorAggregate |
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| 23 | { |
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| 24 | /** |
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| 25 | * Contained elements. |
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| 26 | * |
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| 27 | * @var array |
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| 28 | */ |
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| 29 | protected $data = []; |
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| 30 | |||
| 31 | /** |
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| 32 | * {@inheritdoc} |
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| 33 | */ |
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| 34 | public function getIterator(): Traversable |
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| 38 | |||
| 39 | /** |
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| 40 | * Remove all contained elements. |
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| 41 | */ |
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| 42 | public function clear() |
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| 46 | |||
| 47 | /** |
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| 48 | * Checks if no elements are contained. |
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| 49 | * |
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| 50 | * @return bool |
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| 51 | */ |
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| 52 | public function isEmpty(): bool |
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| 56 | |||
| 57 | /** |
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| 58 | * {@inheritdoc} |
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| 59 | */ |
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| 60 | public function count(): int |
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| 64 | } |
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| 65 |