IAssocContainer<Key,Value> container(getContainer());
rock::AutoPtr<IAssocContainer<Key,Value>::const_range> range(container.getRange_const());
IKeyValIterator<Key,Value> *kvItr = rock::cast<IKeyValIterator<Key,Value>*>(range.begin());
while( !kvRange.empty() ) {
   Key &k = kvItr.getKey();
   Value &k = kvItr.get_const();
   kvItr.next();
}