if no higher bits are set
bitNthLsf
fn
int bitNthLsf(gulong mask, int nthBit)Find the position of the first bit set in mask, searching from (but not including) nth_bit upwards. Bits are numbered from 0 (least significant) to sizeof(#gulong) * 8 - 1 (31 or 63, usually). To start searching from the 0th bit, set nth_bit to -1.
Parameters
mask | a #gulong containing flags |
nthBit | the index of the bit to start the search from |
Returns
the index of the first bit set which is higher than nth_bit, or -1