9.3.13 PrevBit

int PrevBit(unsigned int bit)

The PrevBit method returns the previous set bit before the specified bit position, i.e. the set bit with the highest index less than the argument. If there are no such set bits, this method returns the value -1. If the specified value of bit is greater than or equal to OEBitVector::GetSize(), this method returns the same values as OEBitVector::LastBit().