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