/** {@inheritDoc} */
 public void putAll(TLongFloatMap map) {
   ensureCapacity(map.size());
   TLongFloatIterator iter = map.iterator();
   while (iter.hasNext()) {
     iter.advance();
     this.put(iter.key(), iter.value());
   }
 }
 @Override
 public TLongFloatIterator iterator() {
   return m.iterator(); // Must be manually synched by user!
 }