public boolean retainAll(FloatIterable source)
{
int oldSize = this.size();
final FloatSet sourceSet = source instanceof FloatSet ? (FloatSet) source : source.toSet();
FloatIntHashMap retained = FloatIntHashMap.this.select(new FloatIntPredicate()
{
public boolean accept(float key, int value)
{
return sourceSet.contains(key);
}