wxULongLongNative& operator<<=(int shift)
{ m_ll <<= shift; return *this; }
// right shift
wxULongLongNative operator>>(int shift) const
wxULongLongNative& operator<<=(int shift)
{ m_ll <<= shift; return *this; }
// right shift
wxULongLongNative operator>>(int shift) const