public function count()
    {
        return ( self::$assigned[$this->type] - self::START_AT + self::INCREMENT ) / self::INCREMENT;
    }
public function count()
    {
        return ( self::$assigned[$this->type] - self::START_AT + self::INCREMENT ) / self::INCREMENT;
    }
public function count ( ) { return ( self :: $ assigned [ $ this -> type ] - self :: START_AT + self :: INCREMENT ) / self :: INCREMENT ; }
How many keys have been instantiated so far
@return int
How many keys have been instantiated so far