void update(const string& key,double val) {
int idx = -1;
bool found = da.exactMatchExists(key.c_str(),key.size(),&idx);
if(found) {
data[idx] = val;
return;
}
insert(key,val);
}
bool exists(const string& key,double &old) {
int idx = -1;
bool found = da.exactMatchExists(key.c_str(),key.size(),&idx);
if(found) old = data[idx];
return found;
}