21 lines
337 B
PHP
21 lines
337 B
PHP
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<?php
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namespace App\Definition;
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trait Contract
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{
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protected static $instance = null;
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private function __construct() {}
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protected static function getInstance()
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{
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if (self::$instance == null) {
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self::$instance = static::newInstance();
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}
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return self::$instance;
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}
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abstract protected static function newInstance();
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}
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?>
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