void put(int key, int val) {
// this will do
// unique_lock<shared_mutex> lk(s_mtx);
int hash_key = hash(key);
rw_lock.WriteLock();
for(auto it = m_map[hash_key].begin(); it != m_map[hash_key].end(); it++) {
if((*it).first == key) {
(*it).first = key;
(*it).second = val;
rw_lock.WriteUnLock();
return;
}
}
// new key, insert
m_map[hash_key].push_front({key, val});
rw_lock.WriteUnLock();
}
