bool PositionList::operator==(const PositionList & list) {
const PositionList::Node * curr = mHead;
const PositionList::Node * inner = list.head();
while ( curr != 0) {
while (inner !=0) {
if (*curr->pos != *inner->pos)
return false;
inner = inner->next();
}
inner = list.head();
curr = curr->next();
}
return true;
}
