void LR0ItemCollectionFamily::build()
{
set<int> unhandled;
{
LR0ItemCollection col;
col.insert(LR0Item(0, 0));
int ID;
insertCollection(col, ID);
unhandled.insert(ID);
}
while (!unhandled.empty()) {
int ID = *unhandled.begin();
unhandled.erase(unhandled.begin());
for (auto sym : g_symolList) {
LR0ItemCollection newCol;
auto& col = ID2Collection[ID];
for (auto item : col) {
auto &body = getProductBody(item.productID);
if (item.pos < body.size() && body[item.pos] == sym) {
newCol.insert(LR0Item(item.productID, item.pos + 1));
}
}
if (newCol.empty()) continue;
int newID;
if (insertCollection(newCol, newID)) {
unhandled.insert(newID);
}
transMap[ID][sym] = newID;
}
}
removeCore();
}
bool BTree::remove(const Key& key) {
std::vector<int> tr;
bool found;
PageDB::Location loc;
trace(key, &tr, found, loc);
if (!found)
return false;
auto me = BTreeConstIterator(pgdb, file, loc);
auto next = BTreeIterator(pgdb, file, me.Info().next);
auto prev = BTreeIterator(pgdb, file, me.Info().prev);
prev.Info().next = next.loc;
next.Info().prev = prev.loc;
removeCore(key, tr);
return true;
}