/** Remove one occurrence of the object from the multiset */
public void remove(T obj) {
RefLong x = map.get(obj);
if (x == null) return;
x.dec();
multiSetSize--;
if (x.value() == 0) map.remove(obj);
}
/** Remove N occurrences of the object from the multiset */
public void remove(T obj, long n) {
RefLong x = map.get(obj);
if (x == null) return;
long z = x.value();
if (z < n) n = z;
x.subtract(n);
multiSetSize -= n;
if (x.value() <= 0) map.remove(obj);
}
/** Remove all occurrences of the object in themultiset */
public void removeAll(T obj) {
RefLong x = map.get(obj);
if (x == null) return;
multiSetSize -= x.value();
map.remove(obj);
}
