public static void init(FlagFaceState f) { m_state = f; }
public static void reset(FlagFaceState f) { m_state &= ~f; }
public static bool check(FlagFaceState f) { return((m_state & f) != 0); }
public static void set(FlagFaceState f) { m_state |= f; }
public static bool check(FlagFaceState f) { return ((m_state & f) != 0); }