Map::MapIterator Map::insert(const Map::Pair& pair) {
Map::Node *parent = 0;
Map::Node **target = &m_root; // starting with root
while(*target) {
if (m_order(pair, (*target)->value())) {
parent = *target; // left smaller value
target = &((*target)->m_left);
} else if (m_order((*target)->value(), pair)) {
parent = *target; // right: larger value
target = &((*target)->m_right);
} else break; // already there
}
// actual insertion
if (*target) (*target)->m_pair = pair; // replace value if node exists
else {
*target = new Node(pair, &m_order, parent); // or create new leaf with value
++m_size;
}
return MapIterator(this, *target);
}
bool MapToFirst<K, V>::operator () (const Pair<K, V> &lhs, const Pair<K, V> &rhs){
return m_order(lhs.key(), rhs.key());
}