Hi NorbertSz,
you'll need to learn more about C++ string literals and pointers.
char* is a pointer so it has an address in memory.
Two different locations in memory might have the value but different addresses.
This is what happening with your code char* Asset has one address and the literal string "EURUSD" has another address, they are treated as different keys when used with the map.
E.g check this
printf("\n%s %s", Asset, "EURUSD");
printf("\n%p %p", Asset, "EURUSD");
You probably need to cast them to std::string and use it as a key in your map.
e.g.
std::string key1(Asset);
std::string key2("EURUSD");
map<string, map<int, deque<double>>> prices;
prices[key1] = ...;
... = prices[key2];
C++ also converts char* to string automatically. So this code works the same way:
prices[Asset] = ...;
... = prices["EURUSD"];
P.S. concurrency issue with Andrew above
