/**
* This function is a singleton method used to instantiate the EEM_Answer object
*
* @access public
* @return \EEM_Answer
*/
public static function instance()
{
// check if instance of EEM_Answer already exists
if (!self::$_instance instanceof EEM_Answer) {
// instantiate Espresso_model
self::$_instance = new self();
}
return self::$_instance;
}
