| Total Complexity | 6 | 
| Total Lines | 25 | 
| Duplicated Lines | 0 % | 
| Changes | 1 | ||
| Bugs | 0 | Features | 0 | 
| 1 | <?php  | 
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| 10 | final class SpecialValue  | 
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| 11 | { | 
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| 12 | private static self $empty;  | 
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| 13 | |||
| 14 | public static function init(): void  | 
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| 15 |     { | 
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| 16 | self::$empty = new self();  | 
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| 17 | }  | 
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| 18 | |||
| 19 | /**  | 
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| 20 | * An empty value that is used to indicate that a value has not been set.  | 
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| 21 | */  | 
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| 22 | public static function notSet(): self  | 
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| 23 |     { | 
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| 24 | return self::$empty;  | 
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| 25 | }  | 
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| 26 | |||
| 27 | public static function isNotSet(mixed $value): bool  | 
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| 28 |     { | 
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| 29 | return $value === self::$empty;  | 
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| 30 | }  | 
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| 31 | |||
| 32 | public static function isEmpty(mixed $value): bool  | 
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| 35 | }  | 
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| 36 | }  | 
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| 37 | |||
| 38 | SpecialValue::init();  | 
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| 39 |