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<?php

namespace swag;

/**
 * Singleton
 */
class Singleton {
    private static $instances=array();

    /**
     * Init.
     */
    public static function instance() {
        $class=get_called_class();

        if ($class=='swag\Singleton')
            throw new Exception("Singleton should not be used directly.");

        if (!isset(self::$instances[$class]))
            self::$instances[$class]=new $class;

        return self::$instances[$class];
    }
}