WpfTest/Singleton.php


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<?php
namespace WpfTest;

abstract class Singleton {
    private static array $instances;
    protected function __construct() {
    }
    /**
     * @return static the singleton instance
     */
    public static function getInstance() {
        if (!isset(self::$instances[static::class])) {
            //error_log('making a new ' . static::class);
            self::$instances[static::class] = new static();
        }
        return self::$instances[static::class];
    }
}