stl - C++ - how to tell whether a key exists in map of maps -

i have following structure:

std::map<int, std::map<int, int>> my_map; 

i want check whether key my_map[3][5] exists.

is there easier/shorter way except like:

if (my_map.find(3) != my_map.end()) {     std::map<int, int>& internal_map = my_map[3];     if (internal_map.find(5) != internal_map.end()) {         // ... ...     } } 

you improve little via:

std::map<int, std::map<int, int>>::iterator = my_map.find(3); if (it != my_map.end()){     if (it->second.find(5) != internal_map.end()) {     } } 

in current solution, finding key twice , slower finding once , store in iterator.