public Iterator<IntPair> iterator() {
final Iterator<IntPair> parentIter = parent.iterator();
return new Iterator<IntPair>() {
public boolean hasNext() {
return parentIter.hasNext();
}
public IntPair next() {
IntPair parentPair = parentIter.next();
return new IntPair(parentPair.target, parentPair.source);
}
public void remove() {
parentIter.remove();
}
};
}
