void clear() { hashtable.clear(); entries.clear(); }
iterator begin() { return iterator(this, int(entries.size())-1); }
void clear() { hashtable.clear(); entries.clear(); }
iterator begin() { return iterator(this, int(entries.size())-1); }
iterator end() { return iterator(nullptr, -1); }
const_iterator begin() const { return const_iterator(this, int(entries.size())-1); }
iterator end() { return iterator(nullptr, -1); }
const_iterator begin() const { return const_iterator(this, int(entries.size())-1); }
void reserve(size_t n) { entries.reserve(n); }
size_t size() const { return entries.size(); }
bool empty() const { return entries.empty(); }
void clear() { hashtable.clear(); entries.clear(); }
iterator begin() { return iterator(this, int(entries.size())-1); }
void reserve(size_t n) { entries.reserve(n); }
size_t size() const { return entries.size(); }
bool empty() const { return entries.empty(); }
void clear() { hashtable.clear(); entries.clear(); }
iterator begin() { return iterator(this, int(entries.size())-1); }
iterator end() { return iterator(nullptr, -1); }
const_iterator begin() const { return const_iterator(this, int(entries.size())-1); }
iterator end() { return iterator(nullptr, -1); }
const_iterator begin() const { return const_iterator(this, int(entries.size())-1); }
void clear() { database.clear(); parents.clear(); }
const_iterator begin() const { return database.begin(); }
void clear() { database.clear(); parents.clear(); }
const_iterator begin() const { return database.begin(); }