woocommerce/includes/rest-api/Utilities/SingletonTrait.php

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<?php
/**
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* Singleton class trait.
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*
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* @package Automattic/WooCommerce/Utilities
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*/
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namespace Automattic\WooCommerce\RestApi\Utilities;
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/**
* Singleton trait.
*/
trait SingletonTrait {
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/**
* The single instance of the class.
*
* @var object
*/
protected static $instance = null;
/**
* Constructor
*
* @return void
*/
protected function __construct() {}
/**
* Get class instance.
*
* @return object Instance.
*/
final public static function instance() {
if ( null === static::$instance ) {
static::$instance = new static();
}
return static::$instance;
}
/**
* Prevent cloning.
*/
private function __clone() {}
/**
* Prevent unserializing.
*/
private function __wakeup() {}
}