Even though it makes no sense, it is totally leagal to do so. The two lines normally cost nothing because in the typical case dtor is NULL. Actually type is typically not even ref. But they prevent a memory leak in case someone does stack info ontop of another filter.
Even though it makes no sense, it is totally leagal to do so. The two lines normally cost nothing because in the typical case dtor is NULL. Actually type is typically not even ref. But they prevent a memory leak in case someone does stack info ontop of another filter.