Return a reference providing modifiable access to the mapped value associated with the specified key in this map, if such an entry exists; otherwise throw a std::out_of_range exception. Note that this method is not exception‐neutral.
Return a reference providing modifiable access to the mapped value associated with the specified key in this map, if such an entry exists; otherwise throw a std::out_of_range exception. Note that this method is not exception‐neutral.