/// <summary>
/// Returns the popcount or cardinality of "a and not b"
/// or "intersection(a, not(b))".
/// Neither set is modified.
/// </summary>
public static long AndNotCount(OpenBitSet a, OpenBitSet b)
{
long tot = BitUtil.Pop_AndNot(a.m_bits, b.m_bits, 0, Math.Min(a.m_wlen, b.m_wlen));
if (a.m_wlen > b.m_wlen)
{
tot += BitUtil.Pop_Array(a.m_bits, b.m_wlen, a.m_wlen - b.m_wlen);
}
return(tot);
}
/// <summary>
/// Returns the popcount or cardinality of "a and not b" or
/// "intersection(a, not(b))". Neither set is modified.
/// </summary>
public static long AndNotCount(FixedBitSet a, FixedBitSet b)
{
long tot = BitUtil.Pop_AndNot(a.bits, b.bits, 0, Math.Min(a.numWords, b.numWords));
if (a.numWords > b.numWords)
{
tot += BitUtil.Pop_Array(a.bits, b.numWords, a.numWords - b.numWords);
}
return(tot);
}